Note 14 - Disclosure of Financial Instruments Not Reported at Fair Value - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Cash and cash equivalents	$ 204,351	$ 265,959
Accrued interest receivable	28,539	26,830
Non-interest bearing	1,482,514	1,548,624
Time deposits	1,056,807	983,277
Accrued interest payable	2,155	2,094
Reported Value Measurement [Member]
Cash and cash equivalents	204,351	265,959
HTM debt securities	380,726	439,837
Federal Home Loan Bank stock	31,462	16,236
Loans, net	5,988,808	5,691,664
Accrued interest receivable	28,539	26,830
Non-interest bearing	1,482,514	1,548,624
Transaction deposits	4,029,917	4,138,847
Time deposits	1,056,807	983,277
Securities sold under agreement to repurchase	152,948	152,991
Federal funds purchased	10,029	12,852
Subordinated debentures	26,806	26,740
FHLB advances	400,000	200,000
Accrued interest payable	2,155	2,094
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	204,351	265,959
HTM debt securities	347,886	408,519
Federal Home Loan Bank stock	31,462	16,236
Loans, net	5,763,994	5,520,059
Accrued interest receivable	28,539	26,830
Non-interest bearing	1,482,514	1,548,624
Transaction deposits	4,029,917	4,138,847
Time deposits	1,051,053	976,841
Securities sold under agreement to repurchase	152,948	152,991
Federal funds purchased	10,029	12,852
Subordinated debentures	25,914	26,746
FHLB advances	393,347	200,047
Accrued interest payable	2,155	2,094
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	204,351	265,959
HTM debt securities	150,183	198,327
Federal Home Loan Bank stock	0	0
Loans, net	0	0
Accrued interest receivable	28,539	26,830
Non-interest bearing	1,482,514	1,548,624
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	2,155	2,094
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
HTM debt securities	197,703	210,192
Federal Home Loan Bank stock	31,462	16,236
Loans, net	0	0
Accrued interest receivable	0	0
Non-interest bearing	0	0
Transaction deposits	4,029,917	4,138,847
Time deposits	1,051,053	976,841
Securities sold under agreement to repurchase	152,948	152,991
Federal funds purchased	10,029	12,852
Subordinated debentures	25,914	26,746
FHLB advances	393,347	200,047
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	5,763,994	5,520,059
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