Participation in the Small Business Lending Fund (SBLF) of the U.S. Treasury Department (U.S. Treasury) - (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 17, 2013	Aug. 18, 2011	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2015
Class of Stock [Line Items]
Treasury stock (in shares)			102,017	102,017
Series B Non Cumulative Preferred Stock
Class of Stock [Line Items]
Shares issued and sold to the US Treasury (in shares)		10,000
Liquidation preference (in dollars per share)		$ 1,000
Proceeds from issuance or sale of equity		$ 10.0
Preferred stock redemption (in shares)	5,000
Preferred stock redemption, as a percentage	50.00%
Preferred stock redemption	$ 5.0				$ 5.0
Treasury stock (in shares)					5,000