Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Data (Unaudited) [Abstract]
Interest income	$ 54,939	$ 52,478	$ 51,899	$ 51,466	$ 43,536	$ 48,375	$ 44,080	$ 43,578	$ 210,782	$ 179,569	$ 147,960
Net interest income	51,713	49,996	50,246	42,911	35,179	37,560	34,539	34,010	194,866	141,288	120,849
Provision for credit losses	554	1,297	922	3,579	1,450	650	600	1,700	6,352	4,400	3,585
Non-interest income	23,300	24,352	20,366	16,599	20,498	33,515	19,749	30,365	84,617	104,127	153,795
Non-interest expense	41,783	42,026	42,620	38,418	47,722	42,051	39,519	39,229	164,847	168,521	151,278
Income from continuing operations before income tax expense	32,676	31,025	27,070	17,513	6,505	28,374	14,169	23,446	108,284	72,494	119,781
Income tax expense	8,655	7,894	6,787	4,352	3,641	7,975	3,575	6,035	27,688	21,226	32,241
Net income (loss) from continuing operations	24,021	23,131	20,283	13,161	2,864	20,399	10,594	17,411	80,596	51,268	87,540
Net income (loss) from discontinued operations, net of tax	150	123	(215)	(570)	(1,010)	26	756	519	(512)	291	1,137
Net income	$ 24,171	$ 23,254	$ 20,068	$ 12,591	$ 1,854	$ 20,425	$ 11,350	$ 17,930	$ 80,084	$ 51,559	$ 88,677
Net earnings (loss) per share from continuing operations - basic	$ 0.42	$ 0.40	$ 0.35	$ 0.23	$ 0.05	$ 0.36	$ 0.19	$ 0.31	$ 1.40	$ 0.90	$ 1.55
Net earnings per share from discontinued operations, net of tax				(0.01)	(0.02)		0.01	0.01	(0.01)	0.01	0.02
Net income per share - basic	0.42	0.40	0.35	0.22	0.03	0.36	0.20	0.32	1.39	0.91	1.57
Net earnings (loss) per share from continuing operations - diluted	0.41	0.40	0.35	0.23	0.05	0.36	0.19	0.31	1.38	0.89	1.53
Net earnings per share from discontinued operations - diluted				(0.01)	(0.02)		0.01	0.01	(0.01)	0.01	0.02
Net income per share - diluted	$ 0.41	$ 0.40	$ 0.35	$ 0.22	$ 0.03	$ 0.36	$ 0.20	$ 0.32	$ 1.37	$ 0.90	$ 1.55