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Allowance for Credit Losses on Loans - Summary of Changes in Loan Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of changes in allowance for loan losses              
Balance at the beginning of the year       $ (35,042) $ (36,171) $ (35,042) $ (32,086)
Charge-offs         (5,622) (4,989) (3,605)
Recoveries of loans previously charged-off         2,381 1,807 1,432
Provision for credit losses $ 1,558 $ 466 $ 1,367 $ 920 35,433 4,311 5,129
Balance at the end of the year $ (36,171)       (70,185) $ (36,171) $ (35,042)
Allowance for Loan and Lease Losses Write-offs, Net         (3,200)    
Financing Receivable Allowance for Credit Losses Recovery Details         $ 963