Fair Value - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Nonfinancial Assets and Liabilities [Abstract]
Outstanding balances in impaired loans	$ 51,100		$ 51,100		$ 55,800
Impaired loans, related allowance	4,300		4,300		6,400
Foreclosed assets re-measured after initial recognition			8,800	$ 11,400
Write-downs of allowance for foreclosed assets after initial recognition			1,100	965
Noninterest gain (loss) Mortgage banking, net for changes in fair value of LHFS	2,200	$ 2,200	2,900	1,700
Interest earned on LHFS included in Interest and fees on LHFS and LHFI	1,300	$ 1,400	2,400	$ 2,300
GNMA optional repurchase loans	$ 49,800		$ 49,800		$ 61,600