Common and Preferred Stock (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Nov. 30, 2019
Class of Stock [Line Items]
Repurchase program authorized amount	$ 50,000,000		$ 50,000,000			$ 50,000,000
Shares repurchased (in shares)	0	195,443	826,482	500,495
Repurchase program remaining authorization	$ 29,200,000		$ 29,200,000
Net proceeds from issuance of preferred stock			96,422,000	$ 0
Preferred stock carrying amount	96,422,000		96,422,000		$ 0
Series I perpetual non-cumulative preferred stock
Class of Stock [Line Items]
Preferred stock issued	$ 100,000,000		$ 100,000,000
Issuance of stock (in shares)			4,000
Preferred stock dividend rate (percent)			6.875%
Net proceeds from issuance of preferred stock			$ 96,400,000
Preferred stock redemption price (in dollars per share)	$ 25,000		$ 25,000
Preferred stock carrying amount	$ 96,400,000		$ 96,400,000
Depositary share on Series I perpetual non-cumulative preferred stock
Class of Stock [Line Items]
Preferred stock redemption price (in dollars per share)	$ 25		$ 25