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Note 7 - Fair Value Measurements and Fair Value of Financial Instruments - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Securities available-for-sale $ 646,713 $ 617,162
Reported Value Measurement [Member]    
Cash and due from banks 247,248 242,714
Securities available-for-sale 646,713 617,162
Restricted investments in bank stocks 42,772 51,457
Equity securities 20,399 18,564
Net loans 8,029,482 8,263,171
Derivatives - interest rate contracts 29,501 43,805
Accrued interest receivable 46,951 49,108
Noninterest-bearing deposits 1,262,568 1,259,364
Interest-bearing deposits 6,261,537 6,276,838
Borrowings 742,133 933,579
Subordinated debentures 79,818 79,439
Accrued interest payable 11,306 10,152
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 247,248 242,714
Securities available-for-sale 646,713 617,162
Equity securities 20,399 18,564
Net loans 7,873,145 8,001,504
Derivatives - interest rate contracts 29,501 43,805
Accrued interest receivable 46,951 49,108
Noninterest-bearing deposits 1,262,568 1,259,364
Interest-bearing deposits 6,261,462 6,256,444
Borrowings 742,894 932,081
Subordinated debentures 78,587 77,952
Accrued interest payable 11,306 10,152
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 247,248 242,714
Securities available-for-sale 159 165
Equity securities 10,068 9,867
Net loans 0 0
Derivatives - interest rate contracts 0 0
Accrued interest receivable 0 0
Noninterest-bearing deposits 1,262,568 1,259,364
Interest-bearing deposits 3,647,350 3,745,467
Borrowings 0  
Subordinated debentures 0 0
Accrued interest payable 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and due from banks 0 0
Securities available-for-sale 639,552 609,875
Equity securities 10,331 8,697
Net loans 0 0
Derivatives - interest rate contracts 29,501 43,805
Accrued interest receivable 5,728 5,387
Noninterest-bearing deposits 0 0
Interest-bearing deposits 2,614,112 2,510,977
Borrowings 742,894 932,081
Subordinated debentures 78,587 77,952
Accrued interest payable 11,306 10,152
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and due from banks 0 0
Securities available-for-sale 7,002 7,122
Equity securities 0 0
Net loans 7,873,145 8,001,504
Derivatives - interest rate contracts 0 0
Accrued interest receivable 41,223 43,721
Noninterest-bearing deposits 0 0
Interest-bearing deposits 0 0
Borrowings 0 0
Subordinated debentures 0 0
Accrued interest payable $ 0 $ 0