SBM Acquisition - Pro Forma Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Effective income tax rate (percent)		35.00%	35.00%
SBM Financial, Inc. [Member]
Business Acquisition [Line Items]
Effective income tax rate (percent)		35.00%	35.00%
Total revenues	[1]	$ 146,204	$ 138,196
Net income		$ 33,218	$ 27,757

[1] Revenue is defined as net interest income plus non-interest income.