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Note 21 - Fair Value Measurements and Fair Value of Financial Instruments - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Securities available-for-sale $ 612,847 $ 617,162
Reported Value Measurement [Member]    
Cash and due from banks 356,488 242,714
Securities available-for-sale 612,847 617,162
Restricted investment in bank stocks 40,449 51,457
Equity securities 20,092 18,564
Net loans 8,192,125 8,263,171
Derivatives - interest rate contracts 37,398 43,805
Accrued interest receivable 45,498 49,108
Noninterest-bearing deposits 1,422,044 1,259,364
Interest-bearing deposits 6,398,070 6,276,838
Borrowings 688,064 933,579
Subordinated debentures 79,944 79,439
Accrued interest payable 9,320 10,152
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 356,488 242,714
Securities available-for-sale 612,847 617,162
Equity securities 20,092 18,564
Net loans 7,980,038 8,001,504
Derivatives - interest rate contracts 37,398 43,805
Accrued interest receivable 45,498 49,108
Noninterest-bearing deposits 1,422,044 1,259,364
Interest-bearing deposits 6,387,896 6,256,444
Borrowings 687,273 932,081
Subordinated debentures 77,968 77,952
Accrued interest payable 9,320 10,152
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 356,488 242,714
Securities available-for-sale 171 165
Equity securities 9,739 9,867
Net loans 0 0
Derivatives - interest rate contracts 0 0
Accrued interest receivable 0 0
Noninterest-bearing deposits 1,422,044 1,259,364
Interest-bearing deposits 3,840,870 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 606,150 609,875
Equity securities 10,353 8,697
Net loans 0 0
Derivatives - interest rate contracts 37,398 43,805
Accrued interest receivable 5,444 5,387
Noninterest-bearing deposits 0 0
Interest-bearing deposits 2,547,026 2,510,977
Borrowings 687,273 932,081
Subordinated debentures 77,968 77,952
Accrued interest payable 9,320 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 6,526 7,122
Equity securities 0 0
Net loans 7,980,038 8,001,504
Derivatives - interest rate contracts 0 0
Accrued interest receivable 40,054 43,721
Noninterest-bearing deposits 0 0
Interest-bearing deposits 0 0
Borrowings 0 0
Subordinated debentures 0 0
Accrued interest payable $ 0 $ 0