Condensed Financial Information (Parent Company Only) (Income statement) (Details) - USD ($) $ in Thousands	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
Expenses
Interest expense	$ 26,178	$ 27,137	$ 20,839	$ 15,543	$ 15,650	$ 14,095	$ 11,917	$ 8,930	$ 89,697	$ 50,592	$ 27,790
Salaries and employee benefits									38,093	32,240	21,472
Professional fees									2,326	2,585	1,516
Income taxes	9,434	6,502	5,328	3,541	5,699	5,584	5,186	4,684	24,805	21,153	22,477
Net Income	$ 30,061	$ 20,259	$ 16,439	$ 10,570	$ 15,422	$ 16,739	$ 15,652	$ 15,061	77,329	62,874	54,684
Comprehensive Income									78,097	63,813	54,306
Reportable Legal Entities | Company
Income
Dividends and return of capital from subsidiaries									43,903	37,816	13,632
Other Income										195	208
Total income									43,903	38,011	13,840
Expenses
Interest expense									3,641	8,055	7,603
Salaries and employee benefits									1,611	1,216	1,617
Professional fees									335	707	341
Other									423	420	251
Total expense									6,010	10,398	9,812
Income Before Income Tax and Equity in Undistributed Income of Subsidiaries									37,893	27,613	4,028
Income taxes									(1,433)	(2,542)	(3,670)
Income Before Equity in Undistributed Income of Subsidiaries									39,326	30,155	7,698
Equity in Undistributed Income of Subsidiaries									38,003	32,719	46,986
Net Income									77,329	62,874	54,684
Comprehensive Income									$ 78,097	$ 63,813	$ 54,306