Goodwill and Other Intangible Assets - Schedule of Change in Balance for Core Deposit Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Finite Lived Intangible Assets [Line Items]
Beginning Balance			$ 4,563
Less: amortization expense	$ (558)	$ (526)	(1,073)	$ (1,605)
Ending Balance	12,550		12,550
Core Deposits
Finite Lived Intangible Assets [Line Items]
Beginning Balance	4,048	5,616	4,563	6,695
Less: amortization expense	(558)	(526)	(1,073)	(1,605)
Ending Balance	12,550	$ 5,090	12,550	$ 5,090
Core Deposits | Clayton Banks
Finite Lived Intangible Assets [Line Items]
Addition from merger with Clayton Banks	$ 9,060		$ 9,060