Note 15 - Disclosure of Financial Instruments Not Reported at Fair Value - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Cash and cash equivalents		$ 316,998	$ 167,367
Accrued interest receivable		20,561	22,157
Non-interest bearing deposits		1,845,302	1,950,198
Time deposits	[1]	612,626	472,091
Accrued interest payable		1,029	660
Reported Value Measurement [Member]
Cash and cash equivalents		316,998	167,367
HTM debt securities		468,751	473,217
Federal Home Loan Bank stock		23,226	10,928
Loans, net		5,167,431	5,132,387
Accrued interest receivable		20,561	22,157
Non-interest bearing deposits		1,845,302	1,950,198
Transaction deposits		3,899,267	3,968,963
Time deposits		612,626	472,091
Securities sold under agreement to repurchase		104,578	133,342
Federal funds purchased		14,745	8,789
Subordinated debentures		26,442	26,343
FHLB advances		275,000	50,000
Accrued interest payable		1,029	660
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents		316,998	167,367
HTM debt securities		433,900	431,833
Federal Home Loan Bank stock		23,226	10,928
Loans, net		4,948,173	4,914,770
Accrued interest receivable		20,561	22,157
Non-interest bearing deposits		1,845,302	1,950,198
Transaction deposits		3,899,267	3,968,963
Time deposits		602,758	459,467
Securities sold under agreement to repurchase		104,578	133,342
Federal funds purchased		14,745	8,789
Subordinated debentures		26,492	26,460
FHLB advances		275,188	50,000
Accrued interest payable		1,029	660
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents		316,998	167,367
HTM debt securities		0	0
Federal Home Loan Bank stock		0	0
Loans, net		0	0
Accrued interest receivable		20,561	22,157
Non-interest bearing deposits		1,845,302	1,950,198
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		1,029	660
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents		0	0
HTM debt securities		433,900	431,833
Federal Home Loan Bank stock		23,226	10,928
Loans, net		0	0
Accrued interest receivable		0	0
Non-interest bearing deposits		0	0
Transaction deposits		3,899,267	3,968,963
Time deposits		602,758	459,467
Securities sold under agreement to repurchase		104,578	133,342
Federal funds purchased		14,745	8,789
Subordinated debentures		26,492	26,460
FHLB advances		275,188	50,000
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		4,948,173	4,914,770
Accrued interest receivable		0	0
Non-interest bearing deposits		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

[1] Includes $2.3 million and $599,000 in brokered deposits as of March 31, 2023 and December 31, 2022, respectively.