Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional paid in capital	Retained earnings	Accumulated other comprehensive income (loss)
Balance at Dec. 31, 2016	$ 387,098	$ 203	$ (6,632)	$ 213,078	$ 182,190	$ (1,741)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,190	0	0	0	48,190	0
Other comprehensive income (loss)	(2,077)	0	0	0	0	(2,077)
Cash dividends paid on common shares	(10,249)	0	0	0	(10,249)	0
Repurchase of preferred stock	(16,636)	0	(16,636)	0	0	0
Issuance under equity compensation plans, net	(2,909)	2	0	(2,911)	0	0
Shares issued in connection with acquisition of Trinity Capital Corporation, 3,990,822 shares, net	141,729	33	0	141,696	0	0
Share-based compensation	3,427	0	0	3,427	0	0
Reclassification for the adoption of share-based payment guidance	0	0	0	5,229	(5,229)	0
Balance at Dec. 31, 2017	$ 548,573	238	(23,268)	350,061	225,360	(3,818)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Repurchased During Period, Shares	429,955
Shares Awarded Through Acquisition	3,299,864
Net income	$ 89,217	0	0	0	89,217	0
Other comprehensive income (loss)	(4,630)	0	0	0	0	(4,630)
Cash dividends paid on common shares	(10,845)	0	0	0	10,845	0
Repurchase of preferred stock	(19,387)	0	(19,387)	0	0	0
Issuance under equity compensation plans, net	(2,576)	1	0	(2,577)	0	0
Share-based compensation	3,452	0	0	3,452	0	0
Balance at Dec. 31, 2018	$ 603,804	239	(42,655)	350,936	304,566	(9,282)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Repurchased During Period, Shares	435,432
Reclassification adjustments for change in accounting policies	$ 0	0	0	0	834	(834)
Shares Awarded Through Acquisition	0
Net income	$ 92,739	0	0	0		0
Other comprehensive income (loss)	27,031	0	0	0	0	27,031
Cash dividends paid on common shares	(16,568)	0	0	0	(16,568)	0
Repurchase of preferred stock	(15,526)	0	(15,526)	0	0	0
Issuance under equity compensation plans, net	(212)	2	0	(214)	0	0
Shares issued in connection with acquisition of Trinity Capital Corporation, 3,990,822 shares, net	171,885	40	0	171,845	0	0
Share-based compensation	4,032	0	0	4,032	0	0
Balance at Dec. 31, 2019	$ 867,185	$ 281	$ (58,181)	$ 526,599	$ 380,737	$ 17,749
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Repurchased During Period, Shares	396,737
Shares Awarded Through Acquisition	3,990,822