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Loans (Details 3) - 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 losses |  |  |  |  |
Beginning balance | $ 11,746 | $ 9,720 | $ 10,852 | $ 8,978 | $ 8,978
Provision for loan losses | 950 | 1,110 | 2,950 | 2,880 | 0
Loans charged off | (809) | (562) | (2,477) | (1,959) |
Recoveries | 217 | 250 | 779 | 619 |
Ending balance | 12,104 | 10,518 | 12,104 | 10,518 | 10,852
Commercial real estate |  |  |  |  |
Allowance for loan losses |  |  |  |  |
Beginning balance | 3,954 | 3,210 | 3,577 | 3,127 | 3,127
Provision for loan losses | 264 | 138 | 706 | 516 |
Loans charged off | 0 | (8) | (207) | (315) |
Recoveries | 1 | 1 | 143 | 13 |
Ending balance | 4,219 | 3,341 | 4,219 | 3,341 | 3,577
Commercial |  |  |  |  |
Allowance for loan losses |  |  |  |  |
Beginning balance | 1,936 | 1,634 | 1,874 | 1,373 | 1,373
Provision for loan losses | 87 | 188 | 302 | 464 |
Loans charged off | (10) | 0 | (225) | (37) |
Recoveries | 2 | 0 | 64 | 22 |
Ending balance | 2,015 | 1,822 | 2,015 | 1,822 | 1,874
Residential real estate |  |  |  |  |
Allowance for loan losses |  |  |  |  |
Beginning balance | 2,310 | 2,081 | 2,205 | 1,845 | 1,845
Provision for loan losses | 36 | 105 | 150 | 376 |
Loans charged off | (74) | (87) | (116) | (165) |
Recoveries | 61 | 48 | 94 | 91 |
Ending balance | 2,333 | 2,147 | 2,333 | 2,147 | 2,205
Consumer |  |  |  |  |
Allowance for loan losses |  |  |  |  |
Beginning balance | 2,927 | 2,444 | 2,766 | 2,160 | 2,160
Provision for loan losses | 552 | 423 | 1,592 | 1,390 |
Loans charged off | (725) | (467) | (1,929) | (1,442) |
Recoveries | 153 | 201 | 478 | 493 |
Ending balance | 2,907 | 2,601 | 2,907 | 2,601 | 2,766
Unallocated |  |  |  |  |
Allowance for loan losses |  |  |  |  |
Beginning balance | 619 | 351 | 430 | 473 | 473
Provision for loan losses | 11 | 256 | 200 | 134 |
Loans charged off | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Ending balance | $ 630 | $ 607 | $ 630 | $ 607 | $ 430

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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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 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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