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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
Mar. 31, 2025
Dec. 31, 2024
Investment securities $ 636,806 $ 612,847
Securities available-for-sale 636,806 612,847
Reported Value Measurement [Member]    
Cash and due from banks 292,603 356,488
Investment securities 636,806 612,847
Restricted investments in bank stocks 37,031 40,449
Equity securities 18,859 20,092
Net loans 8,118,731 8,192,125
Derivatives - interest rate contracts 28,914 37,398
Accrued interest receivable 46,740 45,498
Noninterest-bearing deposits 1,319,196 1,422,044
Interest-bearing deposits 6,448,034 6,398,070
Borrowings 613,053 688,064
Subordinated debentures 80,071 79,944
Accrued interest payable 9,514 9,320
Securities available-for-sale 636,806 612,847
Restricted investment in bank stocks 37,031 40,449
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 292,603 356,488
Investment securities 636,806 612,847
Equity securities 18,859 20,092
Net loans 7,944,604 7,980,038
Derivatives - interest rate contracts 28,914 37,398
Accrued interest receivable 46,740 45,498
Noninterest-bearing deposits 1,319,196 1,422,044
Interest-bearing deposits 6,434,530 6,387,896
Borrowings 612,806 687,273
Subordinated debentures 79,795 77,968
Accrued interest payable 9,514 9,320
Securities available-for-sale 636,806 612,847
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 292,603 356,488
Investment securities 125 171
Equity securities 9,893 9,739
Net loans 0 0
Derivatives - interest rate contracts 0 0
Accrued interest receivable 0 0
Noninterest-bearing deposits 1,319,196 1,422,044
Interest-bearing deposits   3,840,870
Borrowings 0 0
Subordinated debentures 0 0
Accrued interest payable 0 0
Securities available-for-sale 125 171
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and due from banks 0 0
Investment securities 630,044 606,150
Equity securities 8,966 10,353
Net loans 0 0
Derivatives - interest rate contracts 28,914 37,398
Accrued interest receivable 5,271 5,444
Noninterest-bearing deposits 0 0
Interest-bearing deposits   2,547,026
Borrowings   687,273
Subordinated debentures   77,968
Accrued interest payable 9,514 9,320
Securities available-for-sale 630,044 606,150
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and due from banks 0 0
Investment securities 6,637 6,526
Equity securities 0 0
Net loans   7,980,038
Derivatives - interest rate contracts 0 0
Accrued interest receivable 41,469 40,054
Noninterest-bearing deposits 0 0
Interest-bearing deposits 0 0
Borrowings 0 0
Subordinated debentures 0 0
Accrued interest payable 0 0
Securities available-for-sale $ 6,637 $ 6,526