Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Not designated as hedging instruments:
Derivative financial instruments
Derivative assets:	$ 5,977	$ 9,108
Derivative liabilities:	3,503	2,500
Designated as hedging instruments:
Derivative financial instruments
Derivative liabilities:	2,536	3,410
Other Assets | Not designated as hedging instruments: | Interest rate contracts
Derivative financial instruments
Derivative assets:	3,171	1,985
Other Assets | Not designated as hedging instruments: | Interest rate lock commitments
Derivative financial instruments
Derivative assets:	2,756	2,643
Other Assets | Not designated as hedging instruments: | Forward commitments
Derivative financial instruments
Derivative assets:	50	4,480
Other Liabilities | Not designated as hedging instruments: | Interest rate contracts
Derivative financial instruments
Derivative liabilities:	3,171	1,985
Other Liabilities | Not designated as hedging instruments: | Interest rate lock commitments
Derivative financial instruments
Derivative liabilities:	4	246
Other Liabilities | Not designated as hedging instruments: | Forward commitments
Derivative financial instruments
Derivative liabilities:	328	269
Other Liabilities | Designated as hedging instruments: | Interest rate swap
Derivative financial instruments
Derivative liabilities:	$ 2,536	$ 3,410