Derivative Instruments - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Not designated as hedging instruments:
Derivative financial instruments
Derivative assets	$ 12,329	$ 6,519
Derivative liabilities	6,205	6,342
Designated as hedging instruments:
Derivative financial instruments
Derivative liabilities	6,290	2,046
Other Assets | Not designated as hedging instruments: | Interest rate contracts
Derivative financial instruments
Derivative assets	5,055	2,779
Other Assets | Not designated as hedging instruments: | Interest rate lock commitments
Derivative financial instruments
Derivative assets	6,694	3,740
Other Assets | Not designated as hedging instruments: | Forward commitments
Derivative financial instruments
Derivative assets	580	0
Other Liabilities | Not designated as hedging instruments: | Interest rate contracts
Derivative financial instruments
Derivative liabilities	5,055	2,779
Other Liabilities | Not designated as hedging instruments: | Interest rate lock commitments
Derivative financial instruments
Derivative liabilities	14	0
Other Liabilities | Not designated as hedging instruments: | Forward commitments
Derivative financial instruments
Derivative liabilities	1,136	3,563
Other Liabilities | Designated as hedging instruments: | Interest rate swaps
Derivative financial instruments
Derivative liabilities	$ 6,290	$ 2,046