Commitments and Contingencies - Total Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies
Total commitments and standby letters of credit	$ 255,093	$ 253,275
Outstanding financial fixed rate commitments	25,100
Outstanding financial variable rate commitments	230,000
Commitments to extend credit
Commitments and Contingencies
Total commitments and standby letters of credit	242,125	237,733
Standby letters of credit
Commitments and Contingencies
Total commitments and standby letters of credit	12,968	15,542
Standby letters of credit | One customer
Commitments and Contingencies
Total commitments and standby letters of credit	$ 10,400	$ 10,400