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Loans (Details 4) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | $ 77 |  | $ 249 |  |  |
Collectively evaluated for impairment | 11,942 |  | 10,603 |  |  |
Acquired loans collectively evaluated for impairment | 85 |  | 0 |  |  |
Total ending allowance balance | 12,104 | $ 11,746 | 10,852 | $ 10,518 | $ 9,720 | $ 8,978
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 4,792 |  | 7,338 |  |  |
Loans collectively evaluated for impairment | 1,212,213 |  | 1,048,074 |  |  |
Acquired loans | 332,621 |  | 370,359 |  |  |
Acquired with deteriorated credit quality | 873,040 |  | 779,340 |  |  |
Loans | 1,551,437 |  | 1,427,635 |  |  |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 1,811 |  | 1,864 |  |  |
Commercial real estate |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 3 |  | 86 |  |  |
Collectively evaluated for impairment | 4,179 |  | 3,491 |  |  |
Acquired loans collectively evaluated for impairment | 37 |  | 0 |  |  |
Total ending allowance balance | 4,219 | 3,954 | 3,577 | 3,341 | 3,210 | 3,127
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 853 |  | 3,457 |  |  |
Loans collectively evaluated for impairment | 466,325 |  | 376,632 |  |  |
Acquired loans | 140,558 |  | 153,228 |  |  |
Loans | 608,755 |  | 534,285 |  |  |
Commercial real estate | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 1,019 |  | 968 |  |  |
Commercial |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 4 |  | 111 |  |  |
Collectively evaluated for impairment | 1,999 |  | 1,763 |  |  |
Acquired loans collectively evaluated for impairment | 12 |  | 0 |  |  |
Total ending allowance balance | 2,015 | 1,936 | 1,874 | 1,822 | 1,634 | 1,373
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 250 |  | 477 |  |  |
Loans collectively evaluated for impairment | 218,907 |  | 195,146 |  |  |
Acquired loans | 44,337 |  | 48,536 |  |  |
Loans | 264,286 |  | 245,055 |  |  |
Commercial | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 792 |  | 896 |  |  |
Residential real estate |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 70 |  | 52 |  |  |
Collectively evaluated for impairment | 2,230 |  | 2,153 |  |  |
Acquired loans collectively evaluated for impairment | 33 |  | 0 |  |  |
Total ending allowance balance | 2,333 | 2,310 | 2,205 | 2,147 | 2,081 | 1,845
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 3,591 |  | 3,308 |  |  |
Loans collectively evaluated for impairment | 324,201 |  | 280,215 |  |  |
Acquired loans | 131,385 |  | 146,672 |  |  |
Loans | 459,177 |  | 430,195 |  |  |
Residential real estate | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Consumer |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 2,904 |  | 2,766 |  |  |
Acquired loans collectively evaluated for impairment | 3 |  | 0 |  |  |
Total ending allowance balance | 2,907 | 2,927 | 2,766 | 2,601 | 2,444 | 2,160
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 98 |  | 96 |  |  |
Loans collectively evaluated for impairment | 202,780 |  | 196,081 |  |  |
Acquired loans | 16,341 |  | 21,923 |  |  |
Loans | 219,219 |  | 218,100 |  |  |
Consumer | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Unallocated |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 630 |  | 430 |  |  |
Acquired loans collectively evaluated for impairment | 0 |  | 0 |  |  |
Total ending allowance balance | 630 | $ 619 | 430 | $ 607 | $ 351 | $ 473
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 0 |  | 0 |  |  |
Loans collectively evaluated for impairment | 0 |  | 0 |  |  |
Acquired loans | 0 |  | 0 |  |  |
Loans | 0 |  | 0 |  |  |
Unallocated | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | $ 0 |  | $ 0 |  |  |

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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 Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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