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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | $ 10,611 | $ 10,198 | $ 10,138 | $ 9,916 | $ 9,916
Charge offs | 401 | 340 | 1,018 | 1,006 | 1,721
Recoveries | 52 | 65 | 142 | 263 | 343
Provision for loan losses | 750 | 375 | 1,750 | 1,125 | 1,600
Ending balance | 11,012 | 10,298 | 11,012 | 10,298 | 10,138
Ending balance specifically evaluated for impairment | 1,916 | 949 | 1,916 | 949 | 974
Ending balance collectively evaluated for impairment | 9,096 | 9,349 | 9,096 | 9,349 | 9,164
Total | 1,121,086 | 1,028,992 | 1,121,086 | 1,028,992 | 1,071,526
Ending balance specifically evaluated for impairment | 35,060 | 28,185 | 35,060 | 28,185 | 27,583
Ending balance collectively evaluated for impairment | 1,086,026 | 1,000,807 | 1,086,026 | 1,000,807 | 1,043,943
Commercial | Real estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 3,996 | 3,955 | 3,988 | 3,120 | 3,120
Charge offs | 0 | 0 | 305 | 33 | 294
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | 8 | 84 | 321 | 952 | 1,162
Ending balance | 4,004 | 4,039 | 4,004 | 4,039 | 3,988
Ending balance specifically evaluated for impairment | 347 | 381 | 347 | 381 | 505
Ending balance collectively evaluated for impairment | 3,657 | 3,658 | 3,657 | 3,658 | 3,483
Total | 301,227 | 297,808 | 301,227 | 297,808 | 302,506
Ending balance specifically evaluated for impairment | 9,836 | 10,442 | 9,836 | 10,442 | 10,021
Ending balance collectively evaluated for impairment | 291,391 | 287,366 | 291,391 | 287,366 | 292,485
Commercial | Construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 517 | 318 | 396 | 580 | 580
Charge offs | 0 | 17 | 0 | 75 | 75
Recoveries | 0 | 4 | 0 | 4 | 8
Provision for loan losses | (14) | 22 | 107 | (182) | (117)
Ending balance | 503 | 327 | 503 | 327 | 396
Ending balance specifically evaluated for impairment | 108 | 99 | 108 | 99 | 100
Ending balance collectively evaluated for impairment | 395 | 228 | 395 | 228 | 296
Total | 32,893 | 18,828 | 32,893 | 18,828 | 25,406
Ending balance specifically evaluated for impairment | 763 | 788 | 763 | 788 | 763
Ending balance collectively evaluated for impairment | 32,130 | 18,040 | 32,130 | 18,040 | 24,643
Commercial | Other |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 2,171 | 1,778 | 1,780 | 1,452 | 1,452
Charge offs | 0 | 137 | 58 | 167 | 376
Recoveries | 7 | 24 | 25 | 80 | 129
Provision for loan losses | 1,045 | 23 | 1,476 | 323 | 575
Ending balance | 3,223 | 1,688 | 3,223 | 1,688 | 1,780
Ending balance specifically evaluated for impairment | 1,130 | 68 | 1,130 | 68 | 39
Ending balance collectively evaluated for impairment | 2,093 | 1,620 | 2,093 | 1,620 | 1,741
Total | 172,986 | 131,198 | 172,986 | 131,198 | 150,769
Ending balance specifically evaluated for impairment | 10,250 | 1,254 | 10,250 | 1,254 | 1,743
Ending balance collectively evaluated for impairment | 162,736 | 129,944 | 162,736 | 129,944 | 149,026
Municipal |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 19 | 17 | 18 | 17 | 17
Charge offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | 1 | 1 | 2 | 1 | 1
Ending balance | 20 | 18 | 20 | 18 | 18
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 20 | 18 | 20 | 18 | 18
Total | 33,311 | 26,153 | 33,311 | 26,153 | 27,056
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 33,311 | 26,153 | 33,311 | 26,153 | 27,056
Residential | Construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 26 | 34 | 44 | 24 | 24
Charge offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | 5 | 3 | (13) | 13 | 20
Ending balance | 31 | 37 | 31 | 37 | 44
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 31 | 37 | 31 | 37 | 44
Total | 15,495 | 14,269 | 15,495 | 14,269 | 18,303
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 15,495 | 14,269 | 15,495 | 14,269 | 18,303
Residential | Term |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 999 | 1,365 | 1,288 | 1,391 | 1,391
Charge offs | 281 | 72 | 351 | 338 | 379
Recoveries | 10 | 14 | 29 | 88 | 93
Provision for loan losses | 429 | 52 | 191 | 218 | 183
Ending balance | 1,157 | 1,359 | 1,157 | 1,359 | 1,288
Ending balance specifically evaluated for impairment | 307 | 318 | 307 | 318 | 304
Ending balance collectively evaluated for impairment | 850 | 1,041 | 850 | 1,041 | 984
Total | 429,572 | 403,159 | 429,572 | 403,159 | 411,469
Ending balance specifically evaluated for impairment | 12,641 | 14,131 | 12,641 | 14,131 | 13,669
Ending balance collectively evaluated for impairment | 416,931 | 389,028 | 416,931 | 389,028 | 397,800
Home equity line of credit |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 684 | 880 | 807 | 893 | 893
Charge offs | 0 | 25 | 28 | 147 | 147
Recoveries | 1 | 1 | 4 | 3 | 5
Provision for loan losses | 2 | 18 | (96) | 125 | 56
Ending balance | 687 | 874 | 687 | 874 | 807
Ending balance specifically evaluated for impairment | 24 | 32 | 24 | 32 | 26
Ending balance collectively evaluated for impairment | 663 | 842 | 663 | 842 | 781
Total | 110,178 | 111,994 | 110,178 | 111,994 | 110,907
Ending balance specifically evaluated for impairment | 1,519 | 1,400 | 1,519 | 1,400 | 1,387
Ending balance collectively evaluated for impairment | 108,659 | 110,594 | 108,659 | 110,594 | 109,520
Consumer |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 529 | 635 | 559 | 566 | 566
Charge offs | 120 | 89 | 276 | 246 | 450
Recoveries | 34 | 22 | 84 | 88 | 108
Provision for loan losses | 92 | 50 | 168 | 210 | 335
Ending balance | 535 | 618 | 535 | 618 | 559
Ending balance specifically evaluated for impairment | 0 | 51 | 0 | 51 | 0
Ending balance collectively evaluated for impairment | 535 | 567 | 535 | 567 | 559
Total | 25,424 | 25,583 | 25,424 | 25,583 | 25,110
Ending balance specifically evaluated for impairment | 51 | 170 | 51 | 170 | 0
Ending balance collectively evaluated for impairment | 25,373 | 25,413 | 25,373 | 25,413 | 25,110
Unallocated |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 1,670 | 1,216 | 1,258 | 1,873 | 1,873
Charge offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | (818) | 122 | (406) | (535) | (615)
Ending balance | 852 | 1,338 | 852 | 1,338 | 1,258
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 852 | 1,338 | 852 | 1,338 | 1,258
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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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