Derivative Instruments - Non-hedge Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement	Other noninterest income
Derivative, Gain (Loss) on Derivative, Net	$ (80)	$ (33)	$ 39
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional	2,592,778	2,119,448
Estimated fair value	(208)	(128)
Not Designated as Hedging Instrument | Assets
Derivative [Line Items]
Notional	1,296,389	1,059,724
Estimated fair value	43,507	22,273
Not Designated as Hedging Instrument | Liabilities
Derivative [Line Items]
Notional	1,296,389	1,059,724
Estimated fair value	$ (43,715)	$ (22,401)