Annual report pursuant to Section 13 and 15(d)

Note 3 - Loans - Loans by Credit Quality Indicator (Details)

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Note 3 - Loans - Loans by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financing receivable, gross $ 7,261,451 $ 6,533,499
Pass [Member]    
Financing receivable, gross 7,137,760 6,394,484
Special Mention [Member]    
Financing receivable, gross 81,952 102,259
Substandard [Member]    
Financing receivable, gross 41,739 36,756
Doubtful [Member]    
Financing receivable, gross 0 0
Commercial Real Estate Portfolio Segment [Member]    
Financing receivable, gross 2,696,210 2,513,225
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]    
Financing receivable, gross 2,629,487 2,447,052
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]    
Financing receivable, gross 46,176 47,754
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]    
Financing receivable, gross 20,547 18,419
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]    
Financing receivable, gross 0 0
Real Estate Portfolio Segment[Member]    
Financing receivable, gross 3,979,060 3,422,589
Real Estate Portfolio Segment[Member] | Construction Loans [Member]    
Financing receivable, gross 521,392 533,192
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 1,587,478 1,463,887
Real Estate Portfolio Segment[Member] | One to Four Family [Member]    
Financing receivable, gross 644,188 621,634
Real Estate Portfolio Segment[Member] | Other Mortgages [Member]    
Financing receivable, gross 1,747,394 1,337,068
Real Estate Portfolio Segment[Member] | Pass [Member]    
Financing receivable, gross 3,931,111 3,357,967
Real Estate Portfolio Segment[Member] | Pass [Member] | Construction Loans [Member]    
Financing receivable, gross 512,373 525,021
Real Estate Portfolio Segment[Member] | Pass [Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 1,555,283 1,431,982
Real Estate Portfolio Segment[Member] | Pass [Member] | One to Four Family [Member]    
Financing receivable, gross 639,959 616,884
Real Estate Portfolio Segment[Member] | Pass [Member] | Other Mortgages [Member]    
Financing receivable, gross 1,735,869 1,309,101
Real Estate Portfolio Segment[Member] | Special Mention [Member]    
Financing receivable, gross 31,045 47,756
Real Estate Portfolio Segment[Member] | Special Mention [Member] | Construction Loans [Member]    
Financing receivable, gross 4,731 6,749
Real Estate Portfolio Segment[Member] | Special Mention [Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 18,240 28,547
Real Estate Portfolio Segment[Member] | Special Mention [Member] | One to Four Family [Member]    
Financing receivable, gross 2,787 2,703
Real Estate Portfolio Segment[Member] | Special Mention [Member] | Other Mortgages [Member]    
Financing receivable, gross 10,018 16,506
Real Estate Portfolio Segment[Member] | Substandard [Member]    
Financing receivable, gross 16,904 16,866
Real Estate Portfolio Segment[Member] | Substandard [Member] | Construction Loans [Member]    
Financing receivable, gross 4,288 1,422
Real Estate Portfolio Segment[Member] | Substandard [Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 13,955 3,358
Real Estate Portfolio Segment[Member] | Substandard [Member] | One to Four Family [Member]    
Financing receivable, gross 1,442 2,047
Real Estate Portfolio Segment[Member] | Substandard [Member] | Other Mortgages [Member]    
Financing receivable, gross 1,507 11,461
Real Estate Portfolio Segment[Member] | Doubtful [Member]    
Financing receivable, gross 0 0
Real Estate Portfolio Segment[Member] | Doubtful [Member] | Construction Loans [Member]    
Financing receivable, gross 0 0
Real Estate Portfolio Segment[Member] | Doubtful [Member] | Owner Occupied Commercial [Member]    
Financing receivable, gross 0 0
Real Estate Portfolio Segment[Member] | Doubtful [Member] | One to Four Family [Member]    
Financing receivable, gross 0 0
Real Estate Portfolio Segment[Member] | Doubtful [Member] | Other Mortgages [Member]    
Financing receivable, gross 0 0
Consumer Portfolio Segment [Member]    
Financing receivable, gross 64,789 64,493
Consumer Portfolio Segment [Member] | Pass [Member]    
Financing receivable, gross 64,789 64,444
Consumer Portfolio Segment [Member] | Special Mention [Member]    
Financing receivable, gross 0 0
Consumer Portfolio Segment [Member] | Substandard [Member]    
Financing receivable, gross 0 49
Consumer Portfolio Segment [Member] | Doubtful [Member]    
Financing receivable, gross $ 0 $ 0