Deposit Accounts - Aggregate Annual Maturities of Certificates of Deposit Accounts (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amount
Within 3 months	$ 487,590
4 to 6 months	281,440
7 to 12 months	214,639
13 to 24 months	58,101
25 to 36 months	8,813
37 to 60 months	7,685
Over 60 months	5
Total certificates of deposit accounts	$ 1,058,273	$ 1,626,842
Weighted Average Interest Rate
Within 3 months (as a percent)	0.14%
4 to 6 months (as a percent)	0.39%
7 to 12 months (as a percent)	0.19%
13 to 24 months (as a percent)	0.45%
25 to 36 months (as a percent)	0.90%
37 to 60 months (as a percent)	0.60%
Over 60 months (as a percent)	0.24%
Total (as a percent)	0.24%	0.88%