Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Loans - Summary of Collateral Types (Details)

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Note 5 - Loans - Summary of Collateral Types (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Financing receivable, gross $ 11,629,802 $ 11,687,968 [1]    
Financing Receivable, Allowance for Credit Loss 148,965 146,297 [1] $ 119,463 $ 116,660
Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 3,081,926 3,145,317    
Financing Receivable, Allowance for Credit Loss     41,417 41,869
Real Estate Portfolio Segment[Member]        
Financing receivable, gross 7,006,152 6,943,861    
Real Estate Portfolio Segment[Member] | Construction Loans [Member]        
Financing receivable, gross 1,469,670 1,532,388    
Financing Receivable, Allowance for Credit Loss 40,483 42,889 27,821 26,994
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]        
Financing receivable, gross 2,243,436 2,199,280    
Real Estate Portfolio Segment[Member] | One to Four Family [Member]        
Financing receivable, gross 1,138,645 1,146,831    
Real Estate Portfolio Segment[Member] | Other Mortgages [Member]        
Financing receivable, gross 3,624,071 3,597,750    
Consumer Portfolio Segment [Member]        
Financing receivable, gross 72,054 66,402    
Financing Receivable, Allowance for Credit Loss 2,430 1,926 $ 1,677 $ 1,968
Real Estate [Member]        
Financing receivable, gross 48,568 44,205    
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 21,757 20,061    
Real Estate [Member] | Real Estate Portfolio Segment[Member]        
Financing receivable, gross 25,939 24,144    
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]        
Financing receivable, gross 872 0    
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]        
Financing receivable, gross 10,935 8,573    
Real Estate [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]        
Financing receivable, gross 3,746 3,260    
Real Estate [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]        
Financing receivable, gross 11,258 12,311    
Real Estate [Member] | Consumer Portfolio Segment [Member]        
Financing receivable, gross 0 0    
Collateral, Accounts Receivable [Member]        
Financing receivable, gross 7,468 12,092    
Collateral, Accounts Receivable [Member] | Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 7,468 12,092    
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member]        
Financing receivable, gross 0 0    
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]        
Financing receivable, gross 0 0    
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]        
Financing receivable, gross 0 0    
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]        
Financing receivable, gross 0 0    
Collateral, Accounts Receivable [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]        
Financing receivable, gross 0 0    
Collateral, Accounts Receivable [Member] | Consumer Portfolio Segment [Member]        
Financing receivable, gross 0 0    
Equipment [Member]        
Financing receivable, gross 831 837    
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 831 837    
Equipment [Member] | Real Estate Portfolio Segment[Member]        
Financing receivable, gross 0 0    
Equipment [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]        
Financing receivable, gross 0 0    
Equipment [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]        
Financing receivable, gross 0 0    
Equipment [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]        
Financing receivable, gross 0 0    
Equipment [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]        
Financing receivable, gross 0 0    
Equipment [Member] | Consumer Portfolio Segment [Member]        
Financing receivable, gross 0 0    
Collateral, Other [Member]        
Financing receivable, gross 25,756 26,270    
Collateral, Other [Member] | Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 24,524 24,998    
Collateral, Other [Member] | Real Estate Portfolio Segment[Member]        
Financing receivable, gross 48 74    
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]        
Financing receivable, gross 1,184      
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Collateral, Accounts Receivable [Member]        
Financing receivable, gross   1,198    
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]        
Financing receivable, gross 48 74    
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]        
Financing receivable, gross 0 0    
Collateral, Other [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]        
Financing receivable, gross 0 0    
Collateral, Other [Member] | Consumer Portfolio Segment [Member]        
Financing receivable, gross 0 0    
Collateral Pledged [Member]        
Financing receivable, gross 82,623 83,404    
Financing Receivable, Allowance for Credit Loss 11,137 10,387    
Collateral Pledged [Member] | Construction Loans [Member]        
Financing Receivable, Allowance for Credit Loss   7    
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member]        
Financing receivable, gross 54,580 57,988    
Financing Receivable, Allowance for Credit Loss 10,558 9,910    
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member]        
Financing receivable, gross 25,987 24,218    
Financing Receivable, Allowance for Credit Loss 574 470    
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]        
Financing receivable, gross 2,056 1,198    
Financing Receivable, Allowance for Credit Loss 5      
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]        
Financing receivable, gross 10,983 8,647    
Financing Receivable, Allowance for Credit Loss 207 154    
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | One to Four Family [Member]        
Financing receivable, gross 3,746 3,260    
Financing Receivable, Allowance for Credit Loss 291 316    
Collateral Pledged [Member] | Real Estate Portfolio Segment[Member] | Other Mortgages [Member]        
Financing receivable, gross 11,258 12,311    
Financing Receivable, Allowance for Credit Loss 76 0    
Collateral Pledged [Member] | Consumer Portfolio Segment [Member]        
Financing receivable, gross 0 0    
Financing Receivable, Allowance for Credit Loss $ 0 $ 0    
[1] derived from audited financial statements.