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Loans - Additional Information (Details)
1 Months Ended 3 Months Ended
Nov. 30, 2019
USD ($)
Loan
Aug. 31, 2019
USD ($)
Loan
Jun. 30, 2019
USD ($)
Loan
Dec. 31, 2019
USD ($)
Loan
Mar. 31, 2020
USD ($)
Loan
Transaction
Segment
Mar. 31, 2019
USD ($)
Loan
May 15, 2020
USD ($)
Loan
Apr. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Accounts Notes And Loans Receivable [Line Items]                  
Number of diverse pools of loans acquired | Loan         7        
Number of separate transactions | Transaction         6        
Loans acquired           $ 24,600,000   $ 10,200,000 $ 15,600,000
Participating interest of acquired loan percentage         90.00%        
Number of loans secured by liens on automobiles | Loan         2,283        
Number of loans outstanding | Loan       1,657 1,573        
Loans acquired carrying amount       $ 27,200,000 $ 24,900,000        
Number of acquired loan charged-off as uncollectible | Loan         32        
Acquired loans cumulative net charge-offs         $ 204,000        
Acquired loans net charge-offs         8,000 $ 37,000      
Unamortized premium included in the carrying value       930,000 $ 833,000        
Number of portfolio segment | Segment         3        
Number of loans | Loan         0 0      
Total loans       781,341,000 $ 750,202,000 $ 657,680,000      
Subsequent Event [Member] | COVID-19 [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Number of loans outstanding | Loan             540    
Total loans             $ 142,900,000    
Troubled Debt Restructuring During Prior Twelve Months [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Number of loans subsequently defaulted | Loan         0 0      
Consumer Loans [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Loans acquired     $ 5,000,000 $ 392,000          
Participating interest of acquired loan percentage     100.00%            
Number of loans outstanding | Loan       87 85        
Loans acquired carrying amount       $ 5,000,000 $ 4,700,000        
Acquired loans net charge-offs         0        
Unamortized premium included in the carrying value         0        
Number of loans unsecured | Loan     89            
Total loans       128,996,000 $ 121,571,000        
Commercial and Industrial Loans [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Loans acquired     $ 5,000,000 $ 1,800,000          
Participating interest of acquired loan percentage     100.00%            
Number of loans outstanding | Loan       43 43        
Loans acquired carrying amount       $ 6,600,000 $ 6,400,000        
Acquired loans net charge-offs         0        
Unamortized premium included in the carrying value         $ 0        
Number of loans unsecured | Loan     43            
Home Equity Lines of Credit [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Loans acquired   $ 21,900,000              
Participating interest of acquired loan percentage   100.00%              
Number of loans outstanding | Loan       376 355        
Loans acquired carrying amount       $ 20,100,000 $ 18,800,000        
Acquired loans net charge-offs         0        
Unamortized premium included in the carrying value       $ 390,000 $ 368,000        
Number of loans secured home equity lines of credit | Loan   395              
Consumer Loans November 2019 [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Loans acquired $ 26,600,000                
Participating interest of acquired loan percentage 59.20%                
Number of loans outstanding | Loan       2,768 2,754        
Loans acquired carrying amount       $ 25,800,000 $ 23,700,000        
Number of acquired loan charged-off as uncollectible | Loan         1        
Acquired loans cumulative net charge-offs         $ 19,000        
Acquired loans net charge-offs         19,000        
Unamortized premium included in the carrying value       114,000 $ 100,000        
Number of loans unsecured | Loan 2,787                
Consumer Loans December 2019                  
Accounts Notes And Loans Receivable [Line Items]                  
Loans acquired       $ 10,300,000          
Participating interest of acquired loan percentage       100.00%          
Number of loans outstanding | Loan       4,259 3,936        
Loans acquired carrying amount       $ 10,300,000 $ 8,800,000        
Acquired loans net charge-offs         0        
Unamortized premium included in the carrying value       $ 245,000 $ 213,000        
Number of loans unsecured | Loan       4,259          
Maturity period of acquired loans description         less than one year to seven years        
First Lien Residential Mortgages [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Loans acquired       $ 2,100,000          
Participating interest of acquired loan percentage       100.00%          
Number of loans outstanding | Loan       25 25        
Loans acquired carrying amount       $ 2,100,000 $ 2,000,000        
Acquired loans net charge-offs         0        
Unamortized premium included in the carrying value       $ 135,000 133,000        
Number of loans secured home equity lines of credit | Loan       25          
Residential Mortgage Loans [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Residential mortgage loans pledged to FHLBNY as blanket collateral       $ 136,900,000 110,300,000        
Total loans       $ 249,312,000 $ 214,637,000        
Minimum [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans         2 years        
Minimum [Member] | Consumer Loans [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans     4 years            
Minimum [Member] | Commercial and Industrial Loans [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans     4 years            
Minimum [Member] | Home Equity Lines of Credit [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans   4 years              
Minimum [Member] | Consumer Loans November 2019 [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans 3 years                
Minimum [Member] | Consumer Loans December 2019                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans         1 year        
Minimum [Member] | First Lien Residential Mortgages [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans       22 years          
Maximum [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans         6 years        
Maximum [Member] | Consumer Loans [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans     10 years            
Maximum [Member] | Commercial and Industrial Loans [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans     10 years            
Maximum [Member] | Home Equity Lines of Credit [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans   30 years              
Maximum [Member] | Consumer Loans November 2019 [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans 5 years                
Maximum [Member] | Consumer Loans December 2019                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans         7 years        
Maximum [Member] | First Lien Residential Mortgages [Member]                  
Accounts Notes And Loans Receivable [Line Items]                  
Maturity period of acquired loans       24 years