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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | $ 952,116 | $ 827,484 | $ 812,573
1 Strong |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 2,442 | 2,421 | 2,274
2 Above Average |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 55,326 | 56,546 | 57,742
3 Satisfactory |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 174,474 | 199,165 | 228,052
4 Average |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 558,911 | 414,786 | 367,869
5 Watch |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 142,683 | 137,026 | 133,695
6 OAEM |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 3,931 | 2,988 | 3,319
7 Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 14,349 | 14,552 | 19,622
8 Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 0 | 0
Commercial | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 550,077 | 442,121 | 407,128
Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 73,302 | 56,565 | 52,038
Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 288,121 | 285,015 | 309,297
Commercial | 1 Strong | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 0 | 0
Commercial | 1 Strong | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 0 | 0
Commercial | 1 Strong | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 2,434 | 2,402 | 2,251
Commercial | 2 Above Average | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 9,220 | 5,938 | 8,492
Commercial | 2 Above Average | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 175 | 2,343 | 1,627
Commercial | 2 Above Average | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 7,144 | 6,326 | 5,361
Commercial | 3 Satisfactory | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 92,596 | 91,475 | 84,178
Commercial | 3 Satisfactory | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 1,831 | 2,889 | 3,145
Commercial | 3 Satisfactory | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 79,693 | 104,432 | 140,360
Commercial | 4 Average | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 355,252 | 261,539 | 230,954
Commercial | 4 Average | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 47,003 | 31,221 | 27,907
Commercial | 4 Average | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 155,189 | 120,570 | 107,552
Commercial | 5 Watch | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 79,885 | 72,840 | 68,565
Commercial | 5 Watch | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 24,293 | 19,893 | 18,919
Commercial | 5 Watch | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 38,505 | 44,293 | 46,211
Commercial | 6 OAEM | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 3,899 | 2,754 | 2,028
Commercial | 6 OAEM | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 0 | 0
Commercial | 6 OAEM | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 32 | 234 | 1,291
Commercial | 7 Substandard | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 9,225 | 7,575 | 12,911
Commercial | 7 Substandard | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 219 | 440
Commercial | 7 Substandard | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 5,124 | 6,758 | 6,271
Commercial | 8 Doubtful | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 0 | 0
Commercial | 8 Doubtful | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 0 | 0
Commercial | 8 Doubtful | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 0 | 0
Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 40,616 | 43,783 | 44,110
Municipal | 1 Strong |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 8 | 19 | 23
Municipal | 2 Above Average |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 38,787 | 41,939 | 42,262
Municipal | 3 Satisfactory |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 354 | 369 | 369
Municipal | 4 Average |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 1,467 | 1,456 | 1,456
Municipal | 5 Watch |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 0 | 0
Municipal | 6 OAEM |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 0 | 0
Municipal | 7 Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | 0 | 0 | 0
Municipal | 8 Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Risk rated loans receivable | $ 0 | $ 0 | $ 0

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