Quarterly Financial Data (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data (Unaudited) [Abstract]
Interest income	$ 43,536,000	$ 48,375,000	$ 44,080,000	$ 43,578,000	$ 38,637,000	$ 38,656,000	$ 35,360,000	$ 35,307,000	$ 179,569,000	$ 147,960,000	$ 122,020,000
Net interest income	35,179,000	37,560,000	34,539,000	34,010,000	30,609,000	30,632,000	29,534,000	30,074,000	141,288,000	120,849,000	106,680,000
Provision for loan and lease losses	1,450,000	650,000	600,000	1,700,000	925,000	1,060,000	900,000	700,000	4,400,000	3,585,000	2,920,000
Non-interest income	20,498,000	33,515,000	19,749,000	30,365,000	16,690,000	90,970,000	17,040,000	29,095,000	104,127,000	153,795,000	91,548,000
Non-interest expense	47,722,000	42,051,000	39,519,000	39,229,000	37,620,000	37,299,000	37,310,000	39,049,000	168,521,000	151,278,000	154,914,000
Income from continuing operations before income tax expense	6,505,000	28,374,000	14,169,000	23,446,000	8,754,000	83,243,000	8,364,000	19,420,000	72,494,000	119,781,000	40,394,000
Income tax expense	3,641,000	7,975,000	3,575,000	6,035,000	2,691,000	21,942,000	2,209,000	5,399,000	21,226,000	32,241,000	23,056,000
Net income (loss) from continuing operations	2,864,000	20,399,000	10,594,000	17,411,000	6,063,000	61,301,000	6,155,000	14,021,000	51,268,000	87,540,000	17,338,000
Net income (loss) from discontinued operations, net of tax	(1,010,000)	26,000	756,000	519,000	1,056,000	(24,000)	(14,000)	119,000	291,000	1,137,000	4,335,000
Net income	$ 1,854,000	$ 20,425,000	$ 11,350,000	$ 17,930,000	$ 7,119,000	$ 61,277,000	$ 6,141,000	$ 14,140,000	$ 51,559,000	$ 88,677,000	$ 21,673,000
Net earnings (loss) per share from continuing operations - basic	$ 0.05	$ 0.36	$ 0.19	$ 0.31	$ 0.11	$ 1.09	$ 0.11	$ 0.25	$ 0.90	$ 1.55	$ 0.31
Net earnings per share from discontinued operations, net of tax	(0.02)		0.01	0.01	0.02				0.01	0.02	0.08
Net income per share - basic	0.03	0.36	0.20	0.32	0.13	1.09	0.11	0.25	0.91	1.57	0.39
Net earnings (loss) per share from continuing operations - diluted	0.05	0.36	0.19	0.31	0.11	1.07	0.11	0.25	0.89	1.53	0.31
Net earnings per share from discontinued operations - diluted	(0.02)		0.01	0.01	0.02				0.01	0.02	0.08
Net income per share - diluted	$ 0.03	$ 0.36	$ 0.20	$ 0.32	$ 0.13	$ 1.07	$ 0.11	$ 0.25	$ 0.90	$ 1.55	$ 0.39