Subsequent Events (Details) - USD ($)		3 Months Ended		9 Months Ended
	Nov. 05, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Nov. 30, 2019
Subsequent Event [Line Items]
Cash dividend declared per common share (in dollars per share)		$ 0.18	$ 0.17	$ 0.54	$ 0.50
Repurchase program authorized amount		$ 50,000,000		$ 50,000,000		$ 50,000,000
Subsequent Event
Subsequent Event [Line Items]
Repurchase program authorized amount	$ 50,000,000
Subsequent Event | Common stock, par value $1 per share
Subsequent Event [Line Items]
Cash dividend declared per common share (in dollars per share)	$ 0.18
Dividend payable date	Jan. 05, 2021
Dividend date of record	Dec. 15, 2020
Subsequent Event | Series I perpetual non-cumulative preferred stock
Subsequent Event [Line Items]
Preferred stock dividend per preferred share (in dollars per share)	$ 429.6875
Dividend payable date	Dec. 15, 2020
Dividend date of record	Nov. 30, 2020
Subsequent Event | Depositary share on Series I perpetual non-cumulative preferred stock
Subsequent Event [Line Items]
Preferred stock dividend per preferred share (in dollars per share)	$ 0.4296875