Other Intangible Assets (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 16, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)		$ (1,903)	$ 5,302
Accumulated Amortization
Amortization of intangible assets		1,903	1,306	$ 1,148
Net
Beginning balance		8,667	3,365
Activity during period		(1,903)	(1,306)	(1,148)
Ending balance		6,764	8,667	3,365
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)		(1,828)	5,377
Gross
Beginning balance		23,908	17,300
Activity during period		0	6,608
Ending balance		23,908	23,908	17,300
Accumulated Amortization
Beginning balance		(15,392)	(14,161)
Amortization of intangible assets		(1,828)	(1,231)
Ending balance		(17,220)	(15,392)	(14,161)
Net
Beginning balance		8,516	3,139
Activity during period		1,828	1,231
Ending balance		6,688	8,516	3,139
Trust Relationship [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)		(75)	(75)
Gross
Beginning balance		753	753
Activity during period		0	0
Ending balance		753	753	753
Accumulated Amortization
Beginning balance		(602)	(527)
Amortization of intangible assets		(75)	(75)
Ending balance		(677)	(602)	(527)
Net
Beginning balance		151	226
Activity during period		75	75
Ending balance		$ 76	$ 151	$ 226
SBM Financial, Inc. [Member] | Core Deposits [Member]
Gross
Activity during period	$ 6,600
Net
Finite-Lived Intangible Assets, Remaining Amortization Period	10 years