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Allowance for Credit Losses and Credit Quality of Loans, Troubled Debt Restructuring (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Contract
Sep. 30, 2020
USD ($)
Contract
Sep. 30, 2021
USD ($)
Contract
Sep. 30, 2020
USD ($)
Contract
Recorded Investment and Number of Modifications Designated as TDRs [Abstract]        
Number of contracts | Contract 4 10 11 25
Pre-modification outstanding recorded investment $ 480 $ 659 $ 1,109 $ 1,663
Post-modification outstanding recorded investment $ 527 $ 715 $ 1,221 $ 1,789
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract]        
Number of contracts | Contract 19 9 41 47
Recorded Investment $ 1,401 $ 299 $ 2,374 $ 2,835
Commercial Loans [Member]        
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract]        
Number of contracts | Contract     0 2
Recorded Investment     $ 0 $ 555
Commercial Loans [Member] | C&I [Member]        
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract]        
Number of contracts | Contract     0 1
Recorded Investment     $ 0 $ 387
Commercial Loans [Member] | CRE [Member]        
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract]        
Number of contracts | Contract     0 1
Recorded Investment     $ 0 $ 168
Consumer Loans [Member]        
Recorded Investment and Number of Modifications Designated as TDRs [Abstract]        
Number of contracts | Contract 1 0 2 1
Pre-modification outstanding recorded investment $ 20 $ 0 $ 38 $ 44
Post-modification outstanding recorded investment $ 20 $ 0 $ 38 $ 44
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract]        
Number of contracts | Contract     2 0
Recorded Investment     $ 18 $ 0
Consumer Loans [Member] | Auto [Member]        
Recorded Investment and Number of Modifications Designated as TDRs [Abstract]        
Number of contracts | Contract 1 0 2 1
Pre-modification outstanding recorded investment $ 20 $ 0 $ 38 $ 44
Post-modification outstanding recorded investment $ 20 $ 0 $ 38 $ 44
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract]        
Number of contracts | Contract     2 0
Recorded Investment     $ 18 $ 0
Residential [Member]        
Recorded Investment and Number of Modifications Designated as TDRs [Abstract]        
Number of contracts | Contract 3 10 9 24
Pre-modification outstanding recorded investment $ 460 $ 659 $ 1,071 $ 1,619
Post-modification outstanding recorded investment $ 507 $ 715 $ 1,183 $ 1,745
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract]        
Number of contracts | Contract 19 9 39 45
Recorded Investment $ 1,401 $ 299 $ 2,356 $ 2,280