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, 2023	Dec. 31, 2022
Securities available-for-sale	$ 617,162	$ 634,884
Reported Value Measurement [Member]
Cash and due from banks	242,714	268,315
Securities available-for-sale	617,162	634,884
Restricted investment in bank stocks	51,457	46,604
Equity securities	18,564	15,811
Net loans	8,263,171	8,009,176
Derivatives - interest rate contracts	43,805	56,797
Accrued interest receivable	49,108	46,062
Noninterest-bearing deposits	1,259,364	1,501,614
Interest-bearing deposits	6,276,838	5,855,008
Borrowings	933,579	857,622
Subordinated debentures	79,439	153,255
Accrued interest payable	10,152	6,925
Estimate of Fair Value Measurement [Member]
Cash and due from banks	242,714	268,315
Securities available-for-sale	617,162	634,884
Equity securities	18,564	15,811
Net loans	8,001,504	7,723,378
Derivatives - interest rate contracts	43,805	56,797
Accrued interest receivable	49,108	46,062
Noninterest-bearing deposits	1,259,364	1,501,614
Interest-bearing deposits	6,256,444	5,811,291
Borrowings	932,081	854,698
Subordinated debentures	77,952	153,581
Accrued interest payable	10,152	6,925
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	242,714	268,315
Securities available-for-sale	165	242
Equity securities	9,867	9,733
Net loans	0	0
Derivatives - interest rate contracts	0	0
Accrued interest receivable	0	0
Noninterest-bearing deposits	1,259,364	1,501,614
Interest-bearing deposits	3,745,467	3,460,818
Borrowings	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	609,875	627,293
Equity securities	8,697	6,078
Net loans	0	0
Derivatives - interest rate contracts	43,805	56,797
Accrued interest receivable	5,387	4,685
Noninterest-bearing deposits	0	0
Interest-bearing deposits	2,510,977	2,350,473
Borrowings	932,081	854,698
Subordinated debentures	77,952	153,581
Accrued interest payable	10,152	6,925
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and due from banks	0	0
Securities available-for-sale	7,122	7,349
Equity securities	0	0
Net loans	8,001,504	7,723,378
Derivatives - interest rate contracts	0	0
Accrued interest receivable	43,721	41,377
Noninterest-bearing deposits	0	0
Interest-bearing deposits	0	0
Borrowings	0	0
Subordinated debentures	0	0
Accrued interest payable	$ 0	$ 0