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Allowance for Loan Losses - Allowance for Loan Loss Activity by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | $ 9,916 | $ 10,344 | $ 10,344
Charge offs | 190 | 716 | 2,373
Recoveries | 118 | 68 | 395
Provision for loan losses | 375 | 500 | 1,550
Ending balance | 10,219 | 10,196 | 9,916
Ending balance specifically evaluated for impairment | 599 | 1,436 | 754
Ending balance collectively evaluated for impairment | 9,620 | 8,760 | 9,162
Total | 1,004,942 | 939,169 | 988,638
Ending balance specifically evaluated for impairment | 28,610 | 34,833 | 29,531
Ending balance collectively evaluated for impairment | 976,332 | 904,336 | 959,107
Commercial real estate |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 3,120 | 3,532 | 3,532
Charge offs | 0 | 122 | 280
Recoveries | 0 | 0 | 2
Provision for loan losses | 404 | (293) | (134)
Ending balance | 3,524 | 3,117 | 3,120
Ending balance specifically evaluated for impairment | 69 | 248 | 89
Ending balance collectively evaluated for impairment | 3,455 | 2,869 | 3,031
Total | 279,683 | 242,021 | 269,462
Ending balance specifically evaluated for impairment | 10,510 | 12,705 | 10,717
Ending balance collectively evaluated for impairment | 269,173 | 229,316 | 258,745
Commercial construction |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 580 | 823 | 823
Charge offs | 58 | 0 | 9
Recoveries | 0 | 0 | 1
Provision for loan losses | (177) | (16) | (235)
Ending balance | 345 | 807 | 580
Ending balance specifically evaluated for impairment | 96 | 396 | 302
Ending balance collectively evaluated for impairment | 249 | 411 | 278
Total | 20,138 | 34,683 | 24,881
Ending balance specifically evaluated for impairment | 967 | 1,380 | 1,026
Ending balance collectively evaluated for impairment | 19,171 | 33,303 | 23,855
Commercial other |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 1,452 | 1,505 | 1,505
Charge offs | 0 | 2 | 732
Recoveries | 20 | 4 | 88
Provision for loan losses | 204 | 207 | 591
Ending balance | 1,676 | 1,714 | 1,452
Ending balance specifically evaluated for impairment | 21 | 347 | 8
Ending balance collectively evaluated for impairment | 1,655 | 1,367 | 1,444
Total | 133,629 | 115,455 | 128,341
Ending balance specifically evaluated for impairment | 1,185 | 2,721 | 1,234
Ending balance collectively evaluated for impairment | 132,444 | 112,734 | 127,107
Municipal |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 17 | 15 | 15
Charge offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Provision for loan losses | 0 | 1 | 2
Ending balance | 17 | 16 | 17
Ending balance specifically evaluated for impairment | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 17 | 16 | 17
Total | 19,042 | 26,277 | 19,751
Ending balance specifically evaluated for impairment | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 19,042 | 26,277 | 19,751
Residential term |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 1,391 | 1,185 | 1,185
Charge offs | 20 | 83 | 420
Recoveries | 65 | 6 | 152
Provision for loan losses | 38 | 0 | 474
Ending balance | 1,474 | 1,108 | 1,391
Ending balance specifically evaluated for impairment | 384 | 421 | 326
Ending balance collectively evaluated for impairment | 1,090 | 687 | 1,065
Total | 405,495 | 383,869 | 403,030
Ending balance specifically evaluated for impairment | 14,540 | 16,348 | 15,088
Ending balance collectively evaluated for impairment | 390,955 | 367,521 | 387,942
Residential construction |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 24 | 20 | 20
Charge offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Provision for loan losses | 9 | 3 | 4
Ending balance | 33 | 23 | 24
Ending balance specifically evaluated for impairment | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 33 | 23 | 24
Total | 11,754 | 13,036 | 8,451
Ending balance specifically evaluated for impairment | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 11,754 | 13,036 | 8,451
Home equity line of credit |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 893 | 1,060 | 1,060
Charge offs | 49 | 447 | 582
Recoveries | 1 | 22 | 31
Provision for loan losses | 60 | 409 | 384
Ending balance | 905 | 1,044 | 893
Ending balance specifically evaluated for impairment | 29 | 24 | 29
Ending balance collectively evaluated for impairment | 876 | 1,020 | 864
Total | 110,249 | 104,100 | 110,202
Ending balance specifically evaluated for impairment | 1,408 | 1,654 | 1,466
Ending balance collectively evaluated for impairment | 108,841 | 102,446 | 108,736
Consumer |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 566 | 542 | 542
Charge offs | 63 | 62 | 350
Recoveries | 32 | 36 | 121
Provision for loan losses | 119 | 10 | 253
Ending balance | 654 | 526 | 566
Ending balance specifically evaluated for impairment | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 654 | 526 | 566
Total | 24,952 | 19,728 | 24,520
Ending balance specifically evaluated for impairment | 0 | 25 | 0
Ending balance collectively evaluated for impairment | 24,952 | 19,703 | 24,520
Unallocated |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 1,873 | 1,662 | 1,662
Charge offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Provision for loan losses | (282) | 179 | 211
Ending balance | 1,591 | 1,841 | 1,873
Ending balance specifically evaluated for impairment | 0 | 0 | 0
Ending balance collectively evaluated for impairment | 1,591 | 1,841 | 1,873
Total | 0 | 0 | 0
Ending balance specifically evaluated for impairment | 0 | 0 | 0
Ending balance collectively evaluated for impairment | $ 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=66008989&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=66008989&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=66008989&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=66008989&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=66008989&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=66008989&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=66008989&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=6379141&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=65884687&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=66008989&loc=d3e5074-111524 + Details
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