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Loans - Narrative (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
application
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
application
Contract
loan
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Period for order of valuations (at least)     18 months    
Troubled debt restructured loans, balance $ 3,850,000 $ 4,016,000 $ 3,850,000 $ 4,016,000  
Number of troubled debt restructured loan paid off | Contract         1
Number of loans which has periodic late payments | Contract     1    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts with Active Forbearance Agreements     0    
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process 509,000   $ 509,000   $ 822,000
Recognized loan fee income $ 19,861,000 16,057,000 $ 59,076,000 47,763,000  
Residential mortgage and commercial loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period past due to discontinue accrual interest on financing receivable     90 days    
Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period past due for write-off of financing receivable (no later than) 120 days   120 days    
Commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Period of financing receivable, updated valuation on real estate secured loans (number of days past due)     90 days    
Number of previous months with no updated valuation completed for corporation to update valuation     12 months    
Impaired financing receivable, valuation on real estate collateralized loans (number of days after the loan is classified as impaired)     30 days    
CARES Act          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructured loans, balance $ 64,845,189   $ 64,845,189    
Number of loans with temporary modifications | loan     65    
Number of applications | application 1,440   1,440    
Total amount under PPP (up to) $ 160,857,603   $ 160,857,603    
Projected fee income     6,000,000    
Recognized loan fee income 741,000   1,417,000    
CARES Act | Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructured loans, balance 1,796,603   $ 1,796,603    
Number of loans with temporary modifications | loan     19    
Entity Loan Modification Program          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from paid off troubled debt restructured loans         $ 2,198,000
Maximum | Commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable term     20 years    
Loan-to-value ratio (no greater than)     80.00%    
Maximum | Residential mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable term     30 years    
Loan-to-value ratio (no greater than)     80.00%    
Loan-to-value ratio that requires private mortgage insurance (in excess of)     80.00%    
Maximum | Home equity lines of credit          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable term     20 years    
Loan-to-value ratio (no greater than)     90.00%    
Nonaccrual          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructured loans, balance 143,000 207,000 $ 143,000 207,000  
Accrual          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructured loans, balance $ 3,707,000 $ 3,809,000 $ 3,707,000 $ 3,809,000