Derivative Financial Instruments (Details 2) - Non-hedging derivative financial instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Financial Instruments
Gain (loss)	$ 999	$ 1,237	$ 179
Interest rate swap contracts | Other expense
Derivative Financial Instruments
Gain (loss)	64	(8)	16
Interest rate swap contracts | Other income
Derivative Financial Instruments
Gain (loss)	730	1,045	357
Loan commitments | Mortgage banking income
Derivative Financial Instruments
Gain (loss)	(4)	45	(10)
Forward contracts - mortgage loan | Mortgage banking income
Derivative Financial Instruments
Gain (loss)	209	155	(263)
Forward contracts - foreign exchange | Other income
Derivative Financial Instruments
Gain (loss)	$ 0	$ 0	$ 79