Off Balance sheets Activities and Derivatives - Gain/Loss on Derivatives (Details) - Not Designated As Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Gains and losses on derivative instruments
Gains (losses) on derivative instruments	$ (74)	$ 296	$ 169	$ 417
Derivative loan commitments | Net gain on sales of loans and other mortgage banking income
Gains and losses on derivative instruments
Gains (losses) on derivative instruments	235	100	785	161
Best Efforts Contracts | Net gain on sales of loans and other mortgage banking income
Gains and losses on derivative instruments
Gains (losses) on derivative instruments	(141)	$ 196	(379)	$ 256
Mandatory Delivery Contracts | Net gain on sales of loans and other mortgage banking income
Gains and losses on derivative instruments
Gains (losses) on derivative instruments	(8)		(16)
To Be Announced securities | Net gain on sales of loans and other mortgage banking income
Gains and losses on derivative instruments
Gains (losses) on derivative instruments	$ (160)		$ (221)