Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Jan. 25, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent events
Revenues from mortgage banking activities										$ 631	$ 452	$ 290
Non-interest expenses attributable to mortgage banking activities		$ 12,906	$ 12,723	$ 13,064	$ 12,621	$ 12,774	$ 12,151	$ 11,429	$ 11,813	$ 51,314	$ 48,167	$ 54,792
Cash dividend declared (in dollars per share)		$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.05	$ 0.24	$ 0.23	$ 0.08
Termination of Mortgage Banking Business
Subsequent events
Revenues from mortgage banking activities										$ 3,400
Non-interest expenses attributable to mortgage banking activities										$ 3,200
Common Stock | Subsequent Event
Subsequent events
Cash dividend declared (in dollars per share)	$ 0.06