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Loans and Allowance for Loan Losses - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
property
segment
loan
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Financing Receivable, Modifications [Line Items]        
Loan portfolio segments | segment 5      
Number of contracts | loan 0 1    
Number of loans modified as troubled debt restructurings with subsequent default | loan 0      
Provision charged to expense $ 67 $ 3,200    
Increase (decrease) provision for loan expensed 3,100      
Allowance for loan losses $ 18,370 13,431 $ 18,346 $ 10,243
Percentage of allowance for credit losses to aggregate loans 0.74%   0.77%  
Consumer Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of loans modified as troubled debt restructurings with subsequent default | loan 3      
Number of properties in other real estate owned | property 0      
Provision charged to expense $ (179) 721    
Allowance for loan losses 3,308 $ 3,301 $ 3,471 $ 2,576
Mortgage loans in process of foreclosure 448      
Trouble Debt Restructuring [Member]        
Financing Receivable, Modifications [Line Items]        
Troubled debt restructuring $ 250   $ 257  
Number of contracts, nonaccrual | loan 0   0  
COVID-19 [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | loan 10      
Number of loans related to payroll protection program | loan 3,710   2,863  
Payroll Protection Program Loans Outstanding $ 338,300   $ 288,900  
Loan modification, amount $ 1,700      
Aggregate loans outstanding percentage 0.07%      
Financing Receivable Paycheck Protection Program Cares Act For 2020 Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Payroll protection program loans net deferred fees receivable $ 1,900      
Financing Receivable Paycheck Protection Program Cares Act For 2021 Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Payroll protection program loans net deferred fees receivable $ 5,400