Derivative Instruments - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Not designated as hedging instruments:
Derivative financial instruments
Derivative assets	$ 11,282	$ 6,519
Derivative liabilities	8,225	6,342
Designated as hedging instruments:
Derivative financial instruments
Derivative liabilities	5,341	2,046
Other Assets | Not designated as hedging instruments: | Interest rate contracts
Derivative financial instruments
Derivative assets	4,026	2,779
Other Assets | Not designated as hedging instruments: | Interest rate lock commitments
Derivative financial instruments
Derivative assets	7,154	3,740
Other Assets | Not designated as hedging instruments: | Forward commitments
Derivative financial instruments
Derivative assets	102	0
Other Liabilities | Not designated as hedging instruments: | Interest rate contracts
Derivative financial instruments
Derivative liabilities	4,026	2,779
Other Liabilities | Not designated as hedging instruments: | Interest rate lock commitments
Derivative financial instruments
Derivative liabilities	15	0
Other Liabilities | Not designated as hedging instruments: | Forward commitments
Derivative financial instruments
Derivative liabilities	4,184	3,563
Other Liabilities | Designated as hedging instruments: | Interest rate swaps
Derivative financial instruments
Derivative liabilities	$ 5,341	$ 2,046