Derivative Instruments - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Not designated as hedging instruments:
Derivative financial instruments
Derivative assets	$ 8,569	$ 9,108
Derivative liabilities	5,187	2,500
Designated as hedging instruments:
Derivative financial instruments
Derivative liabilities	3,242	3,410
Other Assets | Not designated as hedging instruments: | Interest rate contracts
Derivative financial instruments
Derivative assets	4,681	1,985
Other Assets | Not designated as hedging instruments: | Interest rate lock commitments
Derivative financial instruments
Derivative assets	3,327	2,643
Other Assets | Not designated as hedging instruments: | Forward commitments
Derivative financial instruments
Derivative assets	561	4,480
Other Liabilities | Not designated as hedging instruments: | Interest rate contracts
Derivative financial instruments
Derivative liabilities	4,681	1,985
Other Liabilities | Not designated as hedging instruments: | Interest rate lock commitments
Derivative financial instruments
Derivative liabilities	57	246
Other Liabilities | Not designated as hedging instruments: | Forward commitments
Derivative financial instruments
Derivative liabilities	449	269
Other Liabilities | Designated as hedging instruments: | Interest rate swaps
Derivative financial instruments
Derivative liabilities	$ 3,242	$ 3,410