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Loans - Allowance for Loan Losses (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
loan
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses $ 29,232 $ 21,187 $ 26,840   $ 29,232 $ 23,637
Financing receivable, accrued interest, after allowance for credit loss     $ 6,100      
Financing receivable, allowance for credit loss, period increase (decrease) 1,100          
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 29,232 21,187        
Charge-offs (633) (481)        
Recoveries 189 159        
Provision (648) 2,772        
Allowance for Loan Losses, Ending Balance 26,840 23,637        
Number of loans individually evaluated for impairment | loan     6      
Number of loans with an allowance for credit loss on loans individually evaluated for impairment | loan     1      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Allowance for loan losses - Loans Individually Evaluated     $ 556   41 41
Allowance for loan losses - Loans Collectively Evaluated     26,284   29,191 23,596
Ending Loan Balance - Individually Evaluated     5,007   2,703 2,235
Ending Loan Balance - Collectively Evaluated     2,634,236   2,592,327 2,411,958
Accounting Standards Update 2016-13            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses       $ (1,300)    
Cumulative Effect, Period of Adoption, Adjustment            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses (1,300)       (1,300)  
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance (1,300)          
Cumulative Effect, Period of Adoption, Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 27,932       27,932  
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 27,932          
Consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 2,429 10,004 2,429   11,562 10,004
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 11,562 9,408        
Charge-offs (627) (467)        
Recoveries 189 159        
Provision 688 904        
Allowance for Loan Losses, Ending Balance 2,429 10,004        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Allowance for loan losses - Loans Individually Evaluated     0   0 0
Allowance for loan losses - Loans Collectively Evaluated     2,429   11,562 10,004
Ending Loan Balance - Individually Evaluated     0   111 111
Ending Loan Balance - Collectively Evaluated     861,171   859,657 824,598
Consumer | Cumulative Effect, Period of Adoption, Adjustment            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses (9,383)       (9,383)  
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance (9,383)          
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 2,179       2,179  
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 2,179          
Residential            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 8,170 4,929 8,170   5,507 4,929
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 5,507 4,563        
Charge-offs (3) 0        
Recoveries 0 0        
Provision (1,269) 366        
Allowance for Loan Losses, Ending Balance 8,170 4,929        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Allowance for loan losses - Loans Individually Evaluated     0   22 37
Allowance for loan losses - Loans Collectively Evaluated     8,170   5,485 4,892
Ending Loan Balance - Individually Evaluated     1,156   1,417 953
Ending Loan Balance - Collectively Evaluated     906,858   921,504 915,301
Residential | Cumulative Effect, Period of Adoption, Adjustment            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 3,935       3,935  
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 3,935          
Residential | Cumulative Effect, Period of Adoption, Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 9,442       9,442  
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 9,442          
Commercial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 4,297 1,639 4,297   2,173 1,639
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 2,173 1,386        
Charge-offs (3) (14)        
Recoveries 0 0        
Provision 43 267        
Allowance for Loan Losses, Ending Balance 4,297 1,639        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Allowance for loan losses - Loans Individually Evaluated     0   19 4
Allowance for loan losses - Loans Collectively Evaluated     4,297   2,154 1,635
Ending Loan Balance - Individually Evaluated     0   47 34
Ending Loan Balance - Collectively Evaluated     288,551   240,507 147,066
Commercial | Cumulative Effect, Period of Adoption, Adjustment            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 2,084       2,084  
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 2,084          
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 4,257       4,257  
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 4,257          
Commercial Real Estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 11,944 7,065 11,944   9,990 7,065
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 9,990 5,830        
Charge-offs 0 0        
Recoveries 0 0        
Provision (110) 1,235        
Allowance for Loan Losses, Ending Balance 11,944 $ 7,065        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Allowance for loan losses - Loans Individually Evaluated     556   0 0
Allowance for loan losses - Loans Collectively Evaluated     11,388   9,990 7,065
Ending Loan Balance - Individually Evaluated     3,851   1,128 1,137
Ending Loan Balance - Collectively Evaluated     $ 577,656   570,659 $ 524,993
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjustment            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 2,064       2,064  
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance 2,064          
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Finance receivable, allowance for credit losses 12,054       $ 12,054  
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Allowance for Loan Losses, Beginning Balance $ 12,054