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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, 2025
Dec. 31, 2024
Investment securities $ 1,252,202 $ 612,847
Obligations of U.S. states and political subdivisions 1,252,202 612,847
Reported Value Measurement [Member]    
Cash and due from banks 542,734 356,488
Investment securities 1,252,202 612,847
Restricted investments in bank stocks 51,516 40,449
Equity securities 20,133 20,092
Net loans 11,147,137 8,192,125
Derivatives - interest rate contracts 19,505 37,398
Accrued interest receivable 60,630 45,498
Noninterest-bearing deposits 2,513,102 1,422,044
Interest-bearing deposits 8,856,193 6,398,070
Borrowings 833,443 688,064
Subordinated debentures 201,677 79,944
Accrued interest payable 18,035 9,320
Obligations of U.S. states and political subdivisions 1,252,202 612,847
Restricted investment in bank stocks 51,516 40,449
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 542,734 356,488
Investment securities 1,252,202 612,847
Equity securities 20,133 20,092
Net loans 11,049,532 7,980,038
Derivatives - interest rate contracts 19,505 37,398
Accrued interest receivable 60,630 45,498
Noninterest-bearing deposits 2,513,102 1,422,044
Interest-bearing deposits 8,848,658 6,387,896
Borrowings 833,702 687,273
Subordinated debentures 202,734 77,968
Accrued interest payable 18,035 9,320
Obligations of U.S. states and political subdivisions 1,252,202 612,847
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 542,734 356,488
Investment securities 54 171
Equity securities 10,022 9,739
Net loans 0 0
Derivatives - interest rate contracts 0 0
Accrued interest receivable 0 0
Noninterest-bearing deposits 2,513,102 1,422,044
Interest-bearing deposits   3,840,870
Borrowings 0 0
Subordinated debentures 0 0
Accrued interest payable 0 0
Obligations of U.S. states and political subdivisions 54 171
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and due from banks 0 0
Investment securities 1,245,576 606,150
Equity securities 10,111 10,353
Net loans 0 0
Derivatives - interest rate contracts 19,505 37,398
Accrued interest receivable 5,168 5,444
Noninterest-bearing deposits 0 0
Interest-bearing deposits   2,547,026
Borrowings   687,273
Subordinated debentures   77,968
Accrued interest payable 18,035 9,320
Obligations of U.S. states and political subdivisions 1,245,576 606,150
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and due from banks 0 0
Investment securities 6,572 6,526
Equity securities 0 0
Net loans   7,980,038
Derivatives - interest rate contracts 0 0
Accrued interest receivable 55,462 40,054
Noninterest-bearing deposits 0 0
Interest-bearing deposits 0 0
Borrowings 0 0
Subordinated debentures 0 0
Accrued interest payable 0 0
Obligations of U.S. states and political subdivisions $ 6,572 $ 6,526