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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | $ 9,908 | $ 11,644 | $ 10,344 | $ 11,514 | $ 11,514
Charge offs | 517 | 563 | 1,996 | 1,763 | 3,495
Recoveries | 86 | 210 | 229 | 1,040 | 1,175
Provision for loan losses | 200 | 350 | 1,100 | 850 | 1,150
Ending balance | 9,677 | 11,641 | 9,677 | 11,641 | 10,344
Ending balance specifically evaluated for impairment | 826 | 2,843 | 826 | 2,843 | 1,803
Ending balance collectively evaluated for impairment | 8,851 | 8,798 | 8,851 | 8,798 | 8,541
Total | 963,151 | 908,115 | 963,151 | 908,115 | 917,564
Ending balance specifically evaluated for impairment | 30,786 | 36,996 | 30,786 | 36,996 | 35,862
Ending balance collectively evaluated for impairment | 932,365 | 871,119 | 932,365 | 871,119 | 881,702
Commercial real estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 2,943 | 4,236 | 3,532 | 4,602 | 4,602
Charge offs | 132 | 215 | 254 | 530 | 1,205
Recoveries | 1 | 106 | 1 | 108 | 144
Provision for loan losses | 339 | 94 | (128) | 41 | (9)
Ending balance | 3,151 | 4,221 | 3,151 | 4,221 | 3,532
Ending balance specifically evaluated for impairment | 71 | 1,041 | 71 | 1,041 | 346
Ending balance collectively evaluated for impairment | 3,080 | 3,180 | 3,080 | 3,180 | 3,186
Total | 268,741 | 243,936 | 268,741 | 243,936 | 242,311
Ending balance specifically evaluated for impairment | 11,228 | 14,418 | 11,228 | 14,418 | 13,304
Ending balance collectively evaluated for impairment | 257,513 | 229,518 | 257,513 | 229,518 | 229,007
Commercial construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 705 | 700 | 823 | 575 | 575
Charge offs | 0 | 0 | 9 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | (147) | 67 | (256) | 192 | 248
Ending balance | 558 | 767 | 558 | 767 | 823
Ending balance specifically evaluated for impairment | 282 | 411 | 282 | 411 | 413
Ending balance collectively evaluated for impairment | 276 | 356 | 276 | 356 | 410
Total | 23,624 | 26,954 | 23,624 | 26,954 | 30,932
Ending balance specifically evaluated for impairment | 996 | 1,380 | 996 | 1,380 | 1,380
Ending balance collectively evaluated for impairment | 22,628 | 25,574 | 22,628 | 25,574 | 29,552
Commercial other |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 1,671 | 2,143 | 1,505 | 2,276 | 2,276
Charge offs | 246 | 69 | 732 | 244 | 989
Recoveries | 51 | 31 | 66 | 736 | 758
Provision for loan losses | (100) | (163) | 537 | (826) | (540)
Ending balance | 1,376 | 1,942 | 1,376 | 1,942 | 1,505
Ending balance specifically evaluated for impairment | 8 | 660 | 8 | 660 | 129
Ending balance collectively evaluated for impairment | 1,368 | 1,282 | 1,368 | 1,282 | 1,376
Total | 119,097 | 97,651 | 119,097 | 97,651 | 104,531
Ending balance specifically evaluated for impairment | 1,736 | 3,892 | 1,736 | 3,892 | 2,942
Ending balance collectively evaluated for impairment | 117,361 | 93,759 | 117,361 | 93,759 | 101,589
Municipal |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 16 | 16 | 15 | 15 | 15
Charge offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | 0 | (1) | 1 | 0 | 0
Ending balance | 16 | 15 | 16 | 15 | 15
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 16 | 15 | 16 | 15 | 15
Total | 21,377 | 20,722 | 21,377 | 20,722 | 20,424
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 21,377 | 20,722 | 21,377 | 20,722 | 20,424
Residential term |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 1,184 | 1,264 | 1,185 | 1,099 | 1,099
Charge offs | 38 | 108 | 187 | 446 | 699
Recoveries | 4 | 24 | 37 | 32 | 36
Provision for loan losses | 15 | 140 | 130 | 635 | 749
Ending balance | 1,165 | 1,320 | 1,165 | 1,320 | 1,185
Ending balance specifically evaluated for impairment | 435 | 661 | 435 | 661 | 519
Ending balance collectively evaluated for impairment | 730 | 659 | 730 | 659 | 666
Total | 385,145 | 386,768 | 385,145 | 386,768 | 384,032
Ending balance specifically evaluated for impairment | 15,276 | 15,896 | 15,276 | 15,896 | 16,123
Ending balance collectively evaluated for impairment | 369,869 | 370,872 | 369,869 | 370,872 | 367,909
Residential construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 27 | 23 | 20 | 21 | 21
Charge offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 25
Provision for loan losses | (5) | (3) | 2 | (1) | (26)
Ending balance | 22 | 20 | 22 | 20 | 20
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 22 | 20 | 22 | 20 | 20
Total | 12,029 | 12,253 | 12,029 | 12,253 | 12,160
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 12,029 | 12,253 | 12,029 | 12,253 | 12,160
Home equity line of credit |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 918 | 753 | 1,060 | 675 | 675
Charge offs | 24 | 0 | 532 | 153 | 153
Recoveries | 1 | 13 | 31 | 15 | 16
Provision for loan losses | 6 | (31) | 342 | 198 | 522
Ending balance | 901 | 735 | 901 | 735 | 1,060
Ending balance specifically evaluated for impairment | 30 | 70 | 30 | 70 | 396
Ending balance collectively evaluated for impairment | 871 | 665 | 871 | 665 | 664
Total | 109,390 | 101,094 | 109,390 | 101,094 | 103,521
Ending balance specifically evaluated for impairment | 1,550 | 1,384 | 1,550 | 1,384 | 2,087
Ending balance collectively evaluated for impairment | 107,840 | 99,710 | 107,840 | 99,710 | 101,434
Consumer |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 580 | 582 | 542 | 573 | 573
Charge offs | 77 | 171 | 282 | 390 | 449
Recoveries | 29 | 36 | 94 | 149 | 196
Provision for loan losses | 30 | 61 | 208 | 176 | 222
Ending balance | 562 | 508 | 562 | 508 | 542
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 562 | 508 | 562 | 508 | 542
Total | 23,748 | 18,737 | 23,748 | 18,737 | 19,653
Ending balance specifically evaluated for impairment | 0 | 26 | 0 | 26 | 26
Ending balance collectively evaluated for impairment | 23,748 | 18,711 | 23,748 | 18,711 | 19,627
Unallocated |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 1,864 | 1,927 | 1,662 | 1,678 | 1,678
Charge offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision for loan losses | 62 | 186 | 264 | 435 | (16)
Ending balance | 1,926 | 2,113 | 1,926 | 2,113 | 1,662
Ending balance specifically evaluated for impairment | 0 | 0 | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 1,926 | 2,113 | 1,926 | 2,113 | 1,662
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=49124121&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=49124121&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=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually 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=49124121&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=49124121&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually 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=49124121&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=49124121&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=49124121&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 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + 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=28367877&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=49124121&loc=d3e5074-111524 + Details
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