Condensed Financial Information (Parent Company Only) (Income statement) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Expenses
Interest expense	$ 7,958	$ 7,616	$ 6,740	$ 5,476	$ 5,509	$ 4,857	$ 4,360	$ 4,242	$ 27,790	$ 18,968	$ 14,290
Salaries and employee benefits									21,472	14,313	11,962
Professional fees									1,516	1,298	675
Income Tax Expense (Benefit)	1,330	6,445	9,091	5,611	5,728	7,587	4,986	3,367	22,477	21,668	18,798
Net Income	$ 20,329	$ 10,467	$ 14,758	$ 9,130	$ 8,754	$ 11,599	$ 7,625	$ 5,149	54,684	33,127	28,383
Comprehensive Income									54,306	32,731	28,344
Parent Company
Income
Interest income											1
Dividends and return of capital from subsidiary									13,632	16,223	9,416
Other income									208	196
Total income									13,840	16,419	9,417
Expenses
Interest expense									7,603	7,237	6,859
Salaries and employee benefits									1,617	77	73
Professional fees									341	138	90
Other									251	33	22
Total expense									9,812	7,485	7,044
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total									4,028	8,934	2,373
Income Tax Expense (Benefit)									(3,670)	(2,885)	(2,807)
Income Before Equity in Undistributed Income of Subsidiary									7,698	11,819	5,180
Equity in Undistributed Income of Subsidiary									46,986	21,308	23,203
Net Income									54,684	33,127	28,383
Comprehensive Income									$ 54,306	$ 32,731	$ 28,344