Revenue Recognition (Details) - USD ($) $ 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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total out-of-scope non-interest income														$ 17,333	$ 8,725
Total non-interest income	$ 8,709	$ 10,115	$ 6,775	$ 6,037	$ 6,405	$ 5,290	$ 5,450	$ 4,543	$ 4,733	$ 1,630	$ 4,645	$ 5,806	$ 5,534	31,636	21,688	$ 17,172
Deposit Account, Title Insurance And Other Non-Interest Income
Disaggregation of Revenue [Line Items]
Revenue														14,303	12,963
Demand deposit account fees
Disaggregation of Revenue [Line Items]
Revenue									960					4,478	3,987	3,669
Title insurance fees
Disaggregation of Revenue [Line Items]
Revenue									$ 1,017					4,981	4,297	$ 4,163
Other non-interest income
Disaggregation of Revenue [Line Items]
Revenue														$ 4,844	$ 4,679