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Commitments and Contingencies - Allowance for Credit Losses for Unfunded Loan Commitments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Other Commitments [Line Items]          
Balance at beginning of period $ 6,077 $ 3,112      
Impact of adopting ASU 2016-13 7,004 3,112 $ 3,112   $ 3,113
Provision for credit losses 927 2,543      
Balance at end of period $ 7,004 $ 7,004 $ 3,112    
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201602Member  
Impact of ASU 2016-13 Adoption          
Other Commitments [Line Items]          
Balance at beginning of period   $ 1,349      
Impact of adopting ASU 2016-13   1,349 $ 1,349   1,349
Balance at end of period     1,349    
As Reported Under ASU 2016-13          
Other Commitments [Line Items]          
Balance at beginning of period   4,461      
Impact of adopting ASU 2016-13   $ 4,461 4,461   $ 4,462
Balance at end of period     $ 4,461