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Allowance for Loan Losses - Credit quality of the loan portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | $ 865,760 | $ 856,020
Total Past Due | 3,373 | 6,262
Total loans | 869,133 | 862,282
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 | 1,937 | 4,384
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 | 1,003 | 502
90 Days Past Due [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Total Past Due | 433 | 1,376
Commercial and Industrial [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 163,385 | 158,279
Total Past Due | 0 | 0
Total loans | 163,385 | 158,279
90 Days Past Due and Still Accruing | 0 | 0
Commercial and Industrial [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 | 0
Commercial and Industrial [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 and Industrial [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 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 | 82,378 | 91,905
Total Past Due | 0 | 0
Total loans | 82,378 | 91,905
90 Days Past Due and Still Accruing | 0 | 0
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 | 0
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 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 Loans Secured by Nonowner Occupied Real Estate[Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 367,045 | 355,963
Total Past Due | 0 | 580
Total loans | 367,045 | 356,543
90 Days Past Due and Still Accruing | 0 | 0
Commercial Loans Secured by Nonowner 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 | 580
Commercial Loans Secured by Nonowner 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 Loans Secured by Nonowner 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
Real estate - residential mortgage [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 234,832 | 232,465
Total Past Due | 3,308 | 5,499
Total loans | 238,140 | 237,964
90 Days Past Due and Still Accruing | 0 | 0
Real estate - residential mortgage [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 | 1,892 | 3,651
Real estate - residential mortgage [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 | 983 | 472
Real estate - residential mortgage [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 | 433 | 1,376
Consumer [Member] |  |
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans |  |
Current | 18,120 | 17,408
Total Past Due | 65 | 183
Total loans | 18,185 | 17,591
90 Days Past Due and Still Accruing | 0 | 0
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 | 45 | 153
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 | 20 | 30
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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