Note 14 - Disclosure of Financial Instruments Not Reported at Fair Value - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Cash and cash equivalents	$ 403,736	$ 291,020
Accrued interest receivable	27,280	27,697
Non-interest bearing	1,499,383	1,456,138
Time deposits	1,476,523	1,237,788
Accrued interest payable	1,973	1,912
Reported Value Measurement [Member]
Cash and cash equivalents	403,736	291,020
HTM debt securities	212,451	370,171
Federal Home Loan Bank stock	29,315	21,603
Loans, net	6,557,546	6,433,459
Accrued interest receivable	27,280	27,697
Non-interest bearing	1,499,383	1,456,138
Transaction deposits	4,318,060	4,472,475
Time deposits	1,476,523	1,237,788
Securities sold under agreement to repurchase	151,424	162,967
Federal funds purchased	6,540	6,525
Subordinated debentures	26,806	26,806
FHLB advances	300,000	300,000
Accrued interest payable	1,973	1,912
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	403,736	291,020
HTM debt securities	189,017	341,357
Federal Home Loan Bank stock	29,315	21,603
Loans, net	6,378,753	6,256,752
Accrued interest receivable	27,280	27,697
Non-interest bearing	1,499,383	1,456,138
Transaction deposits	4,318,060	4,472,475
Time deposits	1,474,937	1,236,463
Securities sold under agreement to repurchase	151,424	162,967
Federal funds purchased	6,540	6,525
Subordinated debentures	26,327	26,346
FHLB advances	294,643	294,848
Accrued interest payable	1,973	1,912
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	403,736	291,020
HTM debt securities	1,931	153,108
Federal Home Loan Bank stock	0	0
Loans, net	0	0
Accrued interest receivable	27,280	27,697
Non-interest bearing	1,499,383	1,456,138
Transaction deposits	0	0
Time deposits	0	0
Securities sold under agreement to repurchase	0	0
Federal funds purchased	0	0
Subordinated debentures	0	0
FHLB advances	0	0
Accrued interest payable	1,973	1,912
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
HTM debt securities	187,086	188,249
Federal Home Loan Bank stock	29,315	21,603
Loans, net	0	0
Accrued interest receivable	0	0
Non-interest bearing	0	0
Transaction deposits	4,318,060	4,472,475
Time deposits	1,474,937	1,236,463
Securities sold under agreement to repurchase	151,424	162,967
Federal funds purchased	6,540	6,525
Subordinated debentures	26,327	26,346
FHLB advances	294,643	294,848
Accrued interest payable	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
HTM debt securities	0	0
Federal Home Loan Bank stock	0	0
Loans, net	6,378,753	6,256,752
Accrued interest receivable	0	0
Non-interest bearing	0	0
Transaction deposits	0	0
Time deposits	0	0
Securities sold under agreement to repurchase	0	0
Federal funds purchased	0	0
Subordinated debentures	0	0
FHLB advances	0	0
Accrued interest payable	$ 0	$ 0