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Allowance for Loan Losses - Credit quality of the loan portfolio (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | $ 982,208,000 | $ 964,256,000
Total Past Due | 3,041,000 | 7,839,000
Total loans | 985,249,000 | 972,095,000
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 | 2,027,000 | 1,624,000
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 | 23,000 | 4,452,000
90 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 991,000 | 1,763,000
Commercial and Industrial |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 143,803,000 | 151,162,000
Paycheck Protection Program (PPP) |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 67,253,000 | 58,344,000
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 | 95,357,000 | 95,486,000
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 | 407,432,000 | 400,751,000
Real estate-residential mortgage |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 255,319,000 | 249,989,000
Consumer. |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 16,085,000 | 16,363,000
Commercial |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total loans | 713,845,000 | 705,743,000
Commercial | Commercial and Industrial |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 143,803,000 | 148,023,000
Total Past Due | 0 | 3,139,000
Total loans | 143,803,000 | 151,162,000
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 | 0 | 536,000
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 | 2,603,000
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 | 67,253,000 | 58,344,000
Total Past Due | 0 | 0
Total loans | 67,253,000 | 58,344,000
90 Days Past Due and Still Accruing | 0 | 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 | 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 | 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 | 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 | 95,266,000 | 95,486,000
Total Past Due | 91,000 | 0
Total loans | 95,357,000 | 95,486,000
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 | 91,000 | 0
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 | 407,432,000 | 399,850,000
Total Past Due | 0 | 901,000
Total loans | 407,432,000 | 400,751,000
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 | 230,000
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 | 671,000
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 | 271,404,000 | 266,352,000
Consumer | Real estate-residential mortgage |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 252,395,000 | 246,279,000
Total Past Due | 2,924,000 | 3,710,000
Total loans | 255,319,000 | 249,989,000
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 | 1,918,000 | 776,000
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 | 22,000 | 1,178,000
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 | 984,000 | 1,756,000
Consumer | Consumer. |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 16,059,000 | 16,274,000
Total Past Due | 26,000 | 89,000
Total loans | 16,085,000 | 16,363,000
90 Days Past Due and Still Accruing | 0 | 0
Consumer | Consumer. | 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 | 18,000 | 82,000
Consumer | Consumer. | 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 | 1,000 | 0
Consumer | Consumer. | 90 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | $ 7,000 | $ 7,000

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