Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details)

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Note 11 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Cash and cash equivalents $ 107,251 $ 106,317 [1]
Held to maturity debt securities, fair value 963,843 935,953
Federal funds sold 17,958 1,515 [1]
Mortgage loans held for sale 3,981 1,607 [1]
Restricted equity securities 7,307 7,734 [1]
Loans, net 11,452,622 11,541,671 [1]
Federal funds purchased 1,298,066 1,618,798 [1]
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents 959,734 814,538
Held to maturity debt securities, fair value 557,084 507,601
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 959,734 814,538
Held to maturity debt securities, fair value 522,826 470,954
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Held to maturity debt securities, fair value 499,972 526,720
Federal funds sold 17,958 1,515
Mortgage loans held for sale 3,981 1,607
Restricted equity securities 7,307 7,734
Deposits 12,288,219 11,546,805
Federal funds purchased 1,298,066 1,618,798
Other borrowings 64,737 64,726
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Held to maturity debt securities, fair value 440,767 464,749
Federal funds sold 17,958 1,515
Mortgage loans held for sale 3,943 1,604
Restricted equity securities 7,307 7,734
Deposits 12,272,714 11,529,647
Federal funds purchased 1,298,066 1,618,798
Other borrowings 57,583 57,101
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Held to maturity debt securities, fair value 250 250
Loans, net 11,452,622 11,541,671
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Held to maturity debt securities, fair value 250 250
Loans, net $ 11,021,748 $ 11,265,517
[1] derived from audited financial statements.