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Allowance for Loan Losses - Allowance for Loan Loss Activity by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | $ 11,472 | $ 10,611 | $ 10,729 | $ 10,138 | $ 10,138
Charge offs | 223 | 401 | 596 | 1,018 | 1,618
Recoveries | 100 | 52 | 216 | 142 | 209
Provision for loan losses | 333 | 750 | 1,333 | 1,750 | 2,000
Ending balance | 11,682 | 11,012 | 11,682 | 11,012 | 10,729
Ending balance specifically evaluated for impairment | 2,402 | 1,916 | 2,402 | 1,916 | 1,812
Ending balance collectively evaluated for impairment | 9,280 | 9,096 | 9,280 | 9,096 | 8,917
Total | 1,243,558 | 1,121,086 | 1,243,558 | 1,121,086 | 1,164,139
Ending balance specifically evaluated for impairment | 32,098 | 35,060 | 32,098 | 35,060 | 31,392
Ending balance collectively evaluated for impairment | 1,211,460 | 1,086,026 | 1,211,460 | 1,086,026 | 1,132,747
Commercial | Real estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 3,732 | 3,996 | 3,872 | 3,988 | 3,988
Charge offs | 0 | 0 | 0 | 305 | 587
Recoveries | 52 | 0 | 52 | 0 | 0
Provision for loan losses | (195) | 8 | (335) | 321 | 471
Ending balance | 3,589 | 4,004 | 3,589 | 4,004 | 3,872
Ending balance specifically evaluated for impairment | 265 | 347 | 265 | 347 | 224
Ending balance collectively evaluated for impairment | 3,324 | 3,657 | 3,324 | 3,657 | 3,648
Total | 366,390 | 301,227 | 366,390 | 301,227 | 323,809
Ending balance specifically evaluated for impairment | 9,410 | 9,836 | 9,410 | 9,836 | 7,790
Ending balance collectively evaluated for impairment | 356,980 | 291,391 | 356,980 | 291,391 | 316,019
Commercial | Construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 399 | 517 | 434 | 396 | 396
Charge offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | (185) | (14) | (220) | 107 | 38
Ending balance | 214 | 503 | 214 | 503 | 434
Ending balance specifically evaluated for impairment | 0 | 108 | 0 | 108 | 0
Ending balance collectively evaluated for impairment | 214 | 395 | 214 | 395 | 434
Total | 23,889 | 32,893 | 23,889 | 32,893 | 38,056
Ending balance specifically evaluated for impairment | 741 | 763 | 741 | 763 | 741
Ending balance collectively evaluated for impairment | 23,148 | 32,130 | 23,148 | 32,130 | 37,315
Commercial | Other |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 3,475 | 2,171 | 3,358 | 1,780 | 1,780
Charge offs | 51 | 0 | 68 | 58 | 212
Recoveries | 23 | 7 | 33 | 25 | 49
Provision for loan losses | 144 | 1,045 | 268 | 1,476 | 1,741
Ending balance | 3,591 | 3,223 | 3,591 | 3,223 | 3,358
Ending balance specifically evaluated for impairment | 1,890 | 1,130 | 1,890 | 1,130 | 1,309
Ending balance collectively evaluated for impairment | 1,701 | 2,093 | 1,701 | 2,093 | 2,049
Total | 188,128 | 172,986 | 188,128 | 172,986 | 181,528
Ending balance specifically evaluated for impairment | 9,849 | 10,250 | 9,849 | 10,250 | 9,918
Ending balance collectively evaluated for impairment | 178,279 | 162,736 | 178,279 | 162,736 | 171,610
Municipal |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 21 | 19 | 20 | 18 | 18
Charge offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | 2 | 1 | 3 | 2 | 2
Ending balance | 23 | 20 | 23 | 20 | 20
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 23 | 20 | 23 | 20 | 20
Total | 56,704 | 33,311 | 56,704 | 33,311 | 33,391
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 56,704 | 33,311 | 56,704 | 33,311 | 33,391
Residential | Construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 29 | 26 | 36 | 44 | 44
Charge offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | 7 | 5 | 0 | (13) | (8)
Ending balance | 36 | 31 | 36 | 31 | 36
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 36 | 31 | 36 | 31 | 36
Total | 18,166 | 15,495 | 18,166 | 15,495 | 17,868
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 18,166 | 15,495 | 18,166 | 15,495 | 17,868
Residential | Term |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 1,138 | 999 | 1,130 | 1,288 | 1,288
Charge offs | 116 | 281 | 212 | 351 | 456
Recoveries | 3 | 10 | 45 | 29 | 40
Provision for loan losses | 67 | 429 | 129 | 191 | 258
Ending balance | 1,092 | 1,157 | 1,092 | 1,157 | 1,130
Ending balance specifically evaluated for impairment | 238 | 307 | 238 | 307 | 255
Ending balance collectively evaluated for impairment | 854 | 850 | 854 | 850 | 875
Total | 459,449 | 429,572 | 459,449 | 429,572 | 432,661
Ending balance specifically evaluated for impairment | 10,928 | 12,641 | 10,928 | 12,641 | 11,748
Ending balance collectively evaluated for impairment | 448,521 | 416,931 | 448,521 | 416,931 | 420,913
Home equity line of credit |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 678 | 684 | 692 | 807 | 807
Charge offs | 6 | 0 | 121 | 28 | 28
Recoveries | 0 | 1 | 13 | 4 | 11
Provision for loan losses | 47 | 2 | 135 | (96) | (98)
Ending balance | 719 | 687 | 719 | 687 | 692
Ending balance specifically evaluated for impairment | 7 | 24 | 7 | 24 | 24
Ending balance collectively evaluated for impairment | 712 | 663 | 712 | 663 | 668
Total | 105,213 | 110,178 | 105,213 | 110,178 | 111,302
Ending balance specifically evaluated for impairment | 1,168 | 1,519 | 1,168 | 1,519 | 1,179
Ending balance collectively evaluated for impairment | 104,045 | 108,659 | 104,045 | 108,659 | 110,123
Consumer |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 575 | 529 | 545 | 559 | 559
Charge offs | 50 | 120 | 195 | 276 | 335
Recoveries | 22 | 34 | 73 | 84 | 109
Provision for loan losses | 193 | 92 | 317 | 168 | 212
Ending balance | 740 | 535 | 740 | 535 | 545
Ending balance specifically evaluated for impairment | 2 | 0 | 2 | 0 | 0
Ending balance collectively evaluated for impairment | 738 | 535 | 738 | 535 | 545
Total | 25,619 | 25,424 | 25,619 | 25,424 | 25,524
Ending balance specifically evaluated for impairment | 2 | 51 | 2 | 51 | 16
Ending balance collectively evaluated for impairment | 25,617 | 25,373 | 25,617 | 25,373 | 25,508
Unallocated |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 1,425 | 1,670 | 642 | 1,258 | 1,258
Charge offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | 253 | (818) | 1,036 | (406) | (616)
Ending balance | 1,678 | 852 | 1,678 | 852 | 642
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 1,678 | 852 | 1,678 | 852 | 642
Total | 0 | 0 | 0 | 0 | 0
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

X
- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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