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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
Jun. 30, 2025
Dec. 31, 2024
Investment securities $ 1,227,200 $ 612,847
Obligations of U.S. states and political subdivisions 1,227,200 612,847
Reported Value Measurement [Member]    
Cash and due from banks 596,533 356,488
Investment securities 1,227,200 612,847
Restricted investments in bank stocks 49,248 40,449
Equity securities 19,707 20,092
Net loans 11,008,287 8,192,125
Derivatives - interest rate contracts 23,900 37,398
Accrued interest receivable 60,405 45,498
Noninterest-bearing deposits 2,424,529 1,422,044
Interest-bearing deposits 8,853,958 6,398,070
Borrowings 783,859 688,064
Subordinated debentures 276,500 79,944
Accrued interest payable 15,936 9,320
Obligations of U.S. states and political subdivisions 1,227,200 612,847
Restricted investment in bank stocks 49,248 40,449
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 596,533 356,488
Investment securities 1,227,200 612,847
Equity securities 19,707 20,092
Net loans 10,834,868 7,980,038
Derivatives - interest rate contracts 23,900 37,398
Accrued interest receivable 60,405 45,498
Noninterest-bearing deposits 2,424,529 1,422,044
Interest-bearing deposits 8,840,224 6,387,896
Borrowings 783,562 687,273
Subordinated debentures 276,327 77,968
Accrued interest payable 15,936 9,320
Obligations of U.S. states and political subdivisions 1,227,200 612,847
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 596,533 356,488
Investment securities 128 171
Equity securities 9,920 9,739
Net loans 0 0
Derivatives - interest rate contracts 0 0
Accrued interest receivable 0 0
Noninterest-bearing deposits 2,424,529 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 128 171
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and due from banks 0 0
Investment securities 1,220,493 606,150
Equity securities 9,787 10,353
Net loans 0 0
Derivatives - interest rate contracts 23,900 37,398
Accrued interest receivable 5,454 5,444
Noninterest-bearing deposits 0 0
Interest-bearing deposits   2,547,026
Borrowings   687,273
Subordinated debentures   77,968
Accrued interest payable 15,936 9,320
Obligations of U.S. states and political subdivisions 1,220,493 606,150
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and due from banks 0 0
Investment securities 6,579 6,526
Equity securities 0 0
Net loans   7,980,038
Derivatives - interest rate contracts 0 0
Accrued interest receivable 54,951 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 $ 6,579 $ 6,526