Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Income
Net income	$ 30,061	$ 20,259	$ 16,439	$ 10,570	$ 15,422	$ 16,739	$ 15,652	$ 15,061	$ 77,329	$ 62,874	$ 54,684
Dividends on preferred stock	(3,618)	(3,022)	(1,743)	(833)	(832)	(833)	(832)	(833)	(9,216)	(3,330)	(3,330)
Net Income Allocated to Common Shareholders	$ 26,443	$ 17,237	$ 14,696	$ 9,737	$ 14,590	$ 15,906	$ 14,820	$ 14,228	$ 68,113	$ 59,544	$ 51,354
Weighted-Average Shares
Weighted average shares - Basic									28,705,125	28,692,955	22,551,452
Effect of dilutive securities—restricted stock awards									40,582	31,464	16,702
Weighted average shares - diluted									28,745,707	28,724,419	22,568,154
Per Share Amount
Basic earnings per share	$ 0.92	$ 0.60	$ 0.51	$ 0.34	$ 0.51	$ 0.55	$ 0.52	$ 0.50	$ 2.37	$ 2.08	$ 2.28
Diluted earnings per share	$ 0.92	$ 0.60	$ 0.51	$ 0.34	$ 0.51	$ 0.55	$ 0.52	$ 0.50	$ 2.37	$ 2.07	$ 2.28