Long Term Borrowings - Narrative (Details) - USD ($)				3 Months Ended
	Aug. 02, 2021	Jul. 26, 2016	Aug. 05, 2014	Jun. 30, 2021	Dec. 31, 2020	Feb. 26, 2020
Subsequent Event
Long-Term Borrowings
Payments of debt issuance costs	$ 1,300,000
Subordinated Notes, 5.75%
Long-Term Borrowings
Face amount			$ 70,000,000.0
Interest rate (as a percent)			5.75%	5.75%
Net proceeds from issuance of subordinated long-term debt			$ 68,800,000
Payments of debt issuance costs			$ 1,200,000
Long-term borrowings				$ 70,000,000	$ 70,000,000
Subordinated Notes, 5.0%
Long-Term Borrowings
Face amount		$ 150,000,000.0
Interest rate (as a percent)		5.00%		5.00%
Net proceeds from issuance of subordinated long-term debt		$ 147,400,000
Payments of debt issuance costs		$ 2,600,000
Long-term borrowings				$ 150,000,000	150,000,000
Subordinated Notes, 5.0% | Subsequent Event
Long-Term Borrowings
Payments of debt issuance costs	$ 1,300,000
FHLB Advance, 1.81%
Long-Term Borrowings
Interest rate (as a percent)						1.81%
Long-term borrowings				0	$ 50,000,000	$ 50,000,000
Gain on cancellation of debt				$ 911,000