Quarterly Financial Data (Unaudited) - Selected Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Note 23 - Quarterly Financial Data (Unaudited) - Selected Unaudited Quarterly Financial Data (Details)
Interest income	$ 68,971	$ 63,914	$ 64,772	$ 66,670	$ 70,179	$ 69,389	$ 69,575	$ 69,813	$ 264,327	$ 278,956	$ 256,998
Interest expense	13,239	13,990	16,055	25,844	29,000	30,440	29,566	28,010	69,128	117,016	89,592
Net interest income	55,732	49,924	48,717	40,826	41,179	38,949	40,009	41,803	195,199	161,940	167,406
Provision (benefit) for credit losses	3,862	2,470	9,619	7,178	(318)	683	1,474	972	22,600	2,811	575
Other operating (loss) income	(1,181)	1,351	13,737	(2,864)	5,038	1,039	2,451	943	11,043	9,471	10,337
Other operating expense	46,811	29,985	28,755	32,380	29,647	26,045	27,158	32,419	137,931	115,269	111,683
Income (loss) before income tax expense	3,878	18,820	24,080	(1,596)	16,888	13,260	13,828	9,355	45,182	53,331	65,485
Total income tax provision	417	4,489	5,808	(206)	3,957	2,536	3,272	2,287	10,508	12,052	10,395
Net income	$ 3,461	$ 14,331	$ 18,272	$ (1,390)	$ 12,931	$ 10,724	$ 10,556	$ 7,068	$ 34,674	$ 41,279	$ 55,090
Basic earnings (loss) per common share (in dollars per share)	$ 0.11	$ 0.50	$ 0.63	$ (0.05)	$ 0.45	$ 0.37	$ 0.37	$ 0.25	$ 1.18	$ 1.44	$ 1.92
Diluted earnings (loss) per common share (in dollars per share)	0.11	0.50	0.63	(0.05)	0.45	0.37	0.37	0.25	1.18	1.44	1.92
Dividends on common share (in dollars per share)	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.84	$ 0.84	$ 0.80
Basic earnings per share (in shares)	30,603	28,874	28,867	28,853	28,723	28,730	28,761	28,621	29,301	28,709	28,709
Diluted earnings per share (in shares)	30,603	28,874	28,867	28,853	28,723	28,730	28,761	28,621	29,301	28,709	28,710