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Deposits - Interest Expense Incurred on Deposits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest-bearing deposit accounts:      
Interest-bearing demand accounts $ 379 $ 420 $ 100
Savings accounts and money market accounts 4,752 7,338 11,900
NOW accounts 377 599 503
Certificate of deposit accounts 3,036 7,285 10,549
Total interest-bearing deposit accounts $ 8,544 $ 15,642 $ 23,052