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Allowance for Credit Losses and Credit Quality of Loans, Troubled Debt Restructuring - Prior Segments (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Contract
Sep. 30, 2019
USD ($)
Contract
Sep. 30, 2020
USD ($)
Contract
Sep. 30, 2019
USD ($)
Contract
Recorded investment and number of modifications for modified loans [Abstract]        
Number of contracts | Contract 10 3 25 31
Pre-modification outstanding recorded investment $ 659 $ 216 $ 1,663 $ 1,947
Post-modification outstanding recorded investment $ 715 $ 240 $ 1,789 $ 2,011
Recorded investment and number of modifications for subsequently defaulted TDRs [Abstract]        
Number of contracts | Contract 9 19 47 45
Recorded Investment $ 299 $ 914 $ 2,835 $ 2,213
Commercial Loans [Member]        
Recorded investment and number of modifications for modified loans [Abstract]        
Number of contracts | Contract   0   3
Pre-modification outstanding recorded investment   $ 0   $ 453
Post-modification outstanding recorded investment   $ 0   $ 453
Commercial Loans [Member] | C&I [Member]        
Recorded investment and number of modifications for modified loans [Abstract]        
Number of contracts | Contract   0   1
Pre-modification outstanding recorded investment   $ 0   $ 65
Post-modification outstanding recorded investment   $ 0   $ 65
Commercial Loans [Member] | Business Banking [Member]        
Recorded investment and number of modifications for modified loans [Abstract]        
Number of contracts | Contract   0   2
Pre-modification outstanding recorded investment   $ 0   $ 388
Post-modification outstanding recorded investment   $ 0   $ 388
Consumer Loans [Member]        
Recorded investment and number of modifications for modified loans [Abstract]        
Number of contracts | Contract   1   18
Pre-modification outstanding recorded investment   $ 30   $ 552
Post-modification outstanding recorded investment   $ 37   $ 568
Recorded investment and number of modifications for subsequently defaulted TDRs [Abstract]        
Number of contracts | Contract   10   26
Recorded Investment   $ 342   $ 1,126
Consumer Loans [Member] | Indirect Auto [Member]        
Recorded investment and number of modifications for modified loans [Abstract]        
Number of contracts | Contract   0   9
Pre-modification outstanding recorded investment   $ 0   $ 134
Post-modification outstanding recorded investment   $ 0   $ 134
Recorded investment and number of modifications for subsequently defaulted TDRs [Abstract]        
Number of contracts | Contract   1   2
Recorded Investment   $ 10   $ 17
Consumer Loans [Member] | Direct [Member]        
Recorded investment and number of modifications for modified loans [Abstract]        
Number of contracts | Contract   1   9
Pre-modification outstanding recorded investment   $ 30   $ 418
Post-modification outstanding recorded investment   $ 37   $ 434
Recorded investment and number of modifications for subsequently defaulted TDRs [Abstract]        
Number of contracts | Contract   9   24
Recorded Investment   $ 332   $ 1,109
Residential Real Estate [Member]        
Recorded investment and number of modifications for modified loans [Abstract]        
Number of contracts | Contract   2   10
Pre-modification outstanding recorded investment   $ 186   $ 942
Post-modification outstanding recorded investment   $ 203   $ 990
Recorded investment and number of modifications for subsequently defaulted TDRs [Abstract]        
Number of contracts | Contract   9   19
Recorded Investment   $ 572   $ 1,087