Fair Value - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Outstanding balances in collateral dependent related to allowance for credit losses	$ 42,100		$ 42,100
Collateral dependent related to allowance for credit losses	2,300		2,300
Outstanding balances in impaired loans					$ 41,200
Impaired loans, related allowance					5,500
Foreclosed assets remeasured after initial recognition			3,200	$ 8,800
Write-downs of allowance for foreclosed assets after initial recognition			873	1,100
Noninterest gain (loss) Mortgage banking, net for changes in fair value of LHFS	(445)	$ 2,200	7,300	2,900
Interest earned on LHFS included in Interest and fees on LHFS and LHFI	1,500	$ 1,300	2,800	$ 2,400
GNMA optional repurchase loans	$ 121,400		$ 121,400		$ 57,100