Note 20 - Fair Value Measurements and Fair Value of Financial Instruments - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Securities available-for-sale	$ 634,884	$ 534,507
Reported Value Measurement [Member]
Cash and due from banks	268,315	265,536
Securities available-for-sale	634,884	534,507
Restricted investment in bank stocks	46,604	27,826
Equity securities	15,811	13,794
Net loans	8,009,176	6,749,849
Derivatives - interest rate contracts	56,797	3,347
Accrued interest receivable	46,062	34,152
Noninterest-bearing deposits	1,501,614	1,617,049
Interest-bearing deposits	5,855,008	4,715,904
Borrowings	857,622	468,193
Subordinated debentures	153,255	152,951
Accrued interest payable	6,925	2,716
Estimate of Fair Value Measurement [Member]
Cash and due from banks	268,315	265,536
Securities available-for-sale	634,884	534,507
Equity securities	15,811	13,794
Net loans	7,723,378	6,800,287
Derivatives - interest rate contracts	56,797	3,347
Accrued interest receivable	46,062	34,152
Noninterest-bearing deposits	1,501,614	1,617,049
Interest-bearing deposits	5,811,291	4,716,358
Borrowings	854,698	469,671
Subordinated debentures	153,581	163,995
Accrued interest payable	6,925	2,716
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	268,315	265,536
Securities available-for-sale	242	195
Equity securities	9,733	11,081
Net loans	0	0
Derivatives - interest rate contracts	0	0
Accrued interest receivable	0	0
Noninterest-bearing deposits	1,501,614	1,617,049
Interest-bearing deposits	3,460,818	3,565,795
Borrowings	0	0
Subordinated debentures	0	0
Accrued interest payable	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and due from banks	0	0
Securities available-for-sale	627,293	525,747
Equity securities	6,078	2,713
Net loans	0	0
Derivatives - interest rate contracts	56,797	3,347
Accrued interest receivable	4,685	1,554
Noninterest-bearing deposits	0	0
Interest-bearing deposits	2,350,473	1,150,563
Borrowings	854,698	469,671
Subordinated debentures	153,581	163,995
Accrued interest payable	6,925	2,716
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and due from banks	0	0
Securities available-for-sale	7,349	8,565
Equity securities	0	0
Net loans	7,723,378	6,800,287
Derivatives - interest rate contracts	0	0
Accrued interest receivable	41,377	32,598
Noninterest-bearing deposits	0	0
Interest-bearing deposits	0	0
Borrowings	0	0
Subordinated debentures	0	0
Accrued interest payable	$ 0	$ 0