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Summary of Significant Accounting Policies (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
borrower
store
loan
Sep. 30, 2020
USD ($)
borrower
store
loan
fiscalQuarter
Jun. 30, 2020
USD ($)
loan
Mar. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Number of temporary loan modifications | loan 321 321 708      
Historical rate application, period   12 months        
Number of quarters representing reasonable and supportable forecast period | fiscalQuarter   8        
Allowance for credit losses $ 156 $ 156        
Reserve for unfunded commitments 5,092 5,092       $ 0
Outstanding exposure $ 851,000 $ 851,000 $ 1,600,000      
Outstanding exposure percentage 10.80% 10.80% 20.00%      
Allowance for credit losses $ 156 $ 156       $ 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]            
Financing Receivable, Modifications, Number of Contracts | loan   0        
PPP loans            
Term of the loans granted   2 years        
Interest rate (as a percent)   1.00%        
Principal outstanding amount $ 456,100 $ 456,100        
Number of borrowers | borrower 1,400 1,400        
Banking Services            
Number of locations | store 20 20        
Lending Services            
Number of locations | store 5 5        
Lending Services | Residential Mortgage            
Noninterest income $ 1,600          
ASU 2016-13            
Reserve for unfunded commitments       $ 4,100    
ASU 2016-13 | Impact of ASC 326 Adoption            
Allowance for credit losses         $ 10,600  
Reserve for unfunded commitments         $ 4,100