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Commitments and Contingencies - Allowance for Credit Losses for Unfunded Loan Commitments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Balance at beginning of period $ 3,112 $ 2,139  
Impact of adopting ASU 2016-13 at January 1, 2020 3,112 3,112 $ 3,113
Provision for credit losses 6 973  
Balance at end of period 4,467 3,112  
Impact of ASU 2016-13 Adoption      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Balance at beginning of period 1,349 0  
Impact of adopting ASU 2016-13 at January 1, 2020 1,349 0 1,349
Balance at end of period   1,349  
Adjusted Balance      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Balance at beginning of period 4,461 2,139  
Impact of adopting ASU 2016-13 at January 1, 2020 $ 4,461 2,139 $ 4,462
Balance at end of period   $ 4,461