Derivative Instruments - (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Designated as hedging instruments:
Derivative financial instruments
Derivative instruments	$ 4,931	$ 3,847
Not designated as hedging instruments:
Derivative financial instruments
Derivative assets	7,423	3,731
Derivative instruments	4,007	2,446
Other Assets | Not designated as hedging instruments: | Interest rate contracts
Derivative financial instruments
Derivative assets	3,086	2,142
Other Assets | Not designated as hedging instruments: | Interest rate lock commitments
Derivative financial instruments
Derivative assets	4,293	1,584
Other Assets | Not designated as hedging instruments: | Forward commitments
Derivative financial instruments
Derivative assets	44	5
Other Liabilities | Designated as hedging instruments: | Interest rate swaps
Derivative financial instruments
Derivative instruments	4,931	3,847
Other Liabilities | Not designated as hedging instruments: | Interest rate contracts
Derivative financial instruments
Derivative instruments	3,086	2,143
Other Liabilities | Not designated as hedging instruments: | Interest rate lock commitments
Derivative financial instruments
Derivative instruments	4	0
Other Liabilities | Not designated as hedging instruments: | Forward commitments
Derivative financial instruments
Derivative instruments	$ 917	$ 303