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Allowance for Loan Losses and Credit Quality of Loans, Average Recorded Investments on Loans Specifically Evaluated for Impairment and Interest Income Recognized (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | $ 20,857 | $ 20,257 | $ 20,947 | $ 20,668
Interest income recognized | 220 | 214 | 434 | 436
Originated Loans [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 20,857 | 20,257 | 20,947 | 20,668
Interest income recognized | 220 | 214 | 434 | 436
Originated Loans [Member] | Commercial Loans [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 5,628 | 5,373 | 5,790 | 5,599
Interest income recognized | 36 | 36 | 73 | 73
Originated Loans [Member] | Commercial Loans [Member] | C&I [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 326 | 447 | 383 | 457
Interest income recognized | 0 | 1 | 1 | 1
Originated Loans [Member] | Commercial Loans [Member] | CRE [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 4,212 | 3,882 | 4,248 | 4,154
Interest income recognized | 31 | 32 | 61 | 64
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 1,090 | 1,044 | 1,159 | 988
Interest income recognized | 5 | 3 | 11 | 8
Originated Loans [Member] | Consumer Loans [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 7,774 | 8,146 | 7,834 | 8,254
Interest income recognized | 102 | 107 | 202 | 219
Originated Loans [Member] | Consumer Loans [Member] | Dealer Finance [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 221 | 194 | 198 | 188
Interest income recognized | 4 | 1 | 6 | 4
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 7,553 | 7,952 | 7,636 | 8,066
Interest income recognized | 98 | 106 | 196 | 215
Originated Loans [Member] | Residential Real Estate [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 7,455 | 6,738 | 7,323 | 6,815
Interest income recognized | $ 82 | $ 71 | $ 159 | $ 144

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