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Allowance for Loan Losses - Credit quality of the loan portfolio (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
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Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | $ 937,702,000 | $ 878,307,000
Total Past Due | 4,078,000 | 4,399,000
Total loans | 941,780,000 | 882,706,000
90 Days Past Due and Still Accruing | 0 | 0
30-59 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 2,040,000 | 2,490,000
60-89 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 1,039,000 | 887,000
90 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 999,000 | 1,022,000
Commercial and Industrial |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 152,636,000 |
Paycheck Protection Program (PPP) |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 68,460,000 |
Commercial loans secured by owner occupied real estate [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 90,819,000 |
Commercial loans secured by non-owner occupied real estate |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 378,858,000 |
Commercial |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 690,773,000 | 629,212,000
Commercial | Commercial and Industrial |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 152,558,000 | 173,922,000
Total Past Due | 78,000 | 0
Total loans | 152,636,000 | 173,922,000
90 Days Past Due and Still Accruing | 0 | 0
Commercial | Commercial and Industrial | 30-59 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 78,000 | 0
Commercial | Commercial and Industrial | 60-89 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 | 0
Commercial | Commercial and Industrial | 90 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 | 0
Commercial | Paycheck Protection Program (PPP) |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 68,460,000 |
Total Past Due | 0 |
Total loans | 68,460,000 |
90 Days Past Due and Still Accruing | 0 |
Commercial | Paycheck Protection Program (PPP) | 30-59 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 |
Commercial | Paycheck Protection Program (PPP) | 60-89 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 |
Commercial | Paycheck Protection Program (PPP) | 90 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 |
Commercial | Commercial loans secured by owner occupied real estate [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 90,819,000 | 91,538,000
Total Past Due | 0 | 117,000
Total loans | 90,819,000 | 91,655,000
90 Days Past Due and Still Accruing | 0 | 0
Commercial | Commercial loans secured by owner occupied real estate [Member] | 30-59 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 | 117,000
Commercial | Commercial loans secured by owner occupied real estate [Member] | 60-89 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 | 0
Commercial | Commercial loans secured by owner occupied real estate [Member] | 90 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 | 0
Commercial | Commercial loans secured by non-owner occupied real estate |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 378,858,000 | 363,635,000
Total Past Due | 0 | 0
Total loans | 378,858,000 | 363,635,000
90 Days Past Due and Still Accruing | 0 | 0
Commercial | Commercial loans secured by non-owner occupied real estate | 30-59 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 | 0
Commercial | Commercial loans secured by non-owner occupied real estate | 60-89 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 | 0
Commercial | Commercial loans secured by non-owner occupied real estate | 90 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 | 0
Consumer |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 251,007,000 | 253,494,000
Consumer | Real estate-residential mortgage |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 229,851,000 | 231,022,000
Total Past Due | 3,960,000 | 4,217,000
Total loans | 233,811,000 | 235,239,000
90 Days Past Due and Still Accruing | 0 | 0
Consumer | Real estate-residential mortgage | 30-59 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 1,922,000 | 2,331,000
Consumer | Real estate-residential mortgage | 60-89 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 1,039,000 | 864,000
Consumer | Real estate-residential mortgage | 90 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 999,000 | 1,022,000
Consumer | Consumer [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 17,156,000 | 18,190,000
Total Past Due | 40,000 | 65,000
Total loans | 17,196,000 | 18,255,000
90 Days Past Due and Still Accruing | 0 | 0
Consumer | Consumer [Member] | 30-59 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 40,000 | 42,000
Consumer | Consumer [Member] | 60-89 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 0 | 23,000
Consumer | Consumer [Member] | 90 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | $ 0 | $ 0

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