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Loans, net and allowance for loan losses - Changes in Allowance for Loan Losses Account by Major Classification of Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 15,961 |  |  |  | $ 12,975 | $ 15,961 | $ 12,975 | $ 10,338 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (2,149) | (2,468) | (1,427) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 348 | 454 | 364 |  |  |
Provisions | $ 1,200 | $ 1,200 | $ 1,200 | 1,200 | $ 1,400 | $ 1,200 | $ 1,200 | 1,200 | 4,800 | 5,000 | 3,700 |  |  |
Ending balance | 18,960 |  |  |  | 15,961 |  |  |  | 18,960 | 15,961 | 12,975 |  |  |
Beginning Balance |  |  |  | 15,961 |  |  |  | 12,975 | 15,961 | 12,975 | 10,338 |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | $ 766 | $ 1,942 | $ 2,140
Charge-offs |  |  |  |  |  |  |  |  | (2,149) | (2,468) | (1,427) |  |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 18,194 | 14,019 | 10,728
Recoveries |  |  |  |  |  |  |  |  | 348 | 454 | 364 |  |  |
Ending balance: loans acquired with deteriorated credit quality | 18,960 |  |  | 15,961 | 15,961 |  |  | 12,975 | 15,961 | 12,975 | 10,338 | 18,960 | 15,961 | 12,975
Provisions | 1,200 | $ 1,200 | $ 1,200 | 1,200 | 1,400 | $ 1,200 | $ 1,200 | 1,200 | 4,800 | 5,000 | 3,700 |  |  |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Loans |  |  |  |  |  |  |  |  |  |  |  | 1,693,065 | 1,532,965 | 1,340,865
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 9,705 | 11,242 | 10,267
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,682,343 | 1,519,386 | 1,328,230
Ending balance |  |  |  |  |  |  |  |  |  |  |  | 1,017 | 2,337 | 2,368
Total Loans |  |  |  |  |  |  |  |  |  |  |  | 1,693,065 | 1,532,965 | 1,340,865
Ending balance | 18,960 |  |  |  | 15,961 |  |  |  | 18,960 | 15,961 | 12,975 |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 9,705 | 11,242 | 10,267
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,682,343 | 1,519,386 | 1,328,230
Ending balance |  |  |  |  |  |  |  |  |  |  |  | 1,017 | 2,337 | 2,368
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  | 107 |  | 107 |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  | 107 |  |  |
Beginning Balance |  |  |  |  |  |  |  | 107 |  | 107 |  |  |  |
Ending balance: loans acquired with deteriorated credit quality |  |  |  |  |  |  |  | 107 |  | 107 | 107 |  |  | 107
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  | 107 |  |  |
Commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 3,799 |  |  |  | 3,042 | 3,799 | 3,042 | 2,321 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (173) | (776) | (246) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 20 | 86 | 77 |  |  |
Provisions |  |  |  |  |  |  |  |  | 1,406 | 1,447 | 890 |  |  |
Ending balance | 5,052 |  |  |  | 3,799 |  |  |  | 5,052 | 3,799 | 3,042 |  |  |
Beginning Balance |  |  |  | 3,799 |  |  |  | 3,042 | 3,799 | 3,042 | 2,321 |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 159 | 225 | 759
Charge-offs |  |  |  |  |  |  |  |  | (173) | (776) | (246) |  |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 4,893 | 3,574 | 2,283
Recoveries |  |  |  |  |  |  |  |  | 20 | 86 | 77 |  |  |
Ending balance: loans acquired with deteriorated credit quality | 5,052 |  |  | 3,799 | 3,799 |  |  | 3,042 | 3,799 | 3,042 | 2,321 | 5,052 | 3,799 | 3,042
Provisions |  |  |  |  |  |  |  |  | 1,406 | 1,447 | 890 |  |  |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Loans |  |  |  |  |  |  |  |  |  |  |  | 476,199 | 408,814 | 365,767
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 2,121 | 1,724 | 1,196
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 473,736 | 406,127 | 363,620
Ending balance |  |  |  |  |  |  |  |  |  |  |  | 342 | 963 | 951
Total Loans |  |  |  |  |  |  |  |  |  |  |  | 476,199 | 408,814 | 365,767
Ending balance | 5,052 |  |  |  | 3,799 |  |  |  | 5,052 | 3,799 | 3,042 |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 2,121 | 1,724 | 1,196
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 473,736 | 406,127 | 363,620
Ending balance |  |  |  |  |  |  |  |  |  |  |  | 342 | 963 | 951
Real estate Commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 5,847 |  |  |  | 4,245 | 5,847 | 4,245 | 3,037 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (706) | (858) | (325) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 124 | 122 | 144 |  |  |
Provisions |  |  |  |  |  |  |  |  | 2,283 | 2,338 | 1,389 |  |  |
Ending balance | 7,548 |  |  |  | 5,847 |  |  |  | 7,548 | 5,847 | 4,245 |  |  |
Beginning Balance |  |  |  | 5,847 |  |  |  | 4,245 | 5,847 | 4,245 | 3,037 |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 263 | 1,197 | 126
Charge-offs |  |  |  |  |  |  |  |  | (706) | (858) | (325) |  |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 7,285 | 4,650 | 4,012
Recoveries |  |  |  |  |  |  |  |  | 124 | 122 | 144 |  |  |
Ending balance: loans acquired with deteriorated credit quality | 7,548 |  |  | 5,847 | 5,847 |  |  | 4,245 | 5,847 | 4,245 | 3,037 | 7,548 | 5,847 | 4,245
Provisions |  |  |  |  |  |  |  |  | 2,283 | 2,338 | 1,389 |  |  |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Loans |  |  |  |  |  |  |  |  |  |  |  | 786,210 | 700,144 | 567,277
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 3,644 | 5,820 | 4,006
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 781,921 | 692,987 | 561,903
Ending balance |  |  |  |  |  |  |  |  |  |  |  | 645 | 1,337 | 1,368
Total Loans |  |  |  |  |  |  |  |  |  |  |  | 786,210 | 700,144 | 567,277
Ending balance | 7,548 |  |  |  | 5,847 |  |  |  | 7,548 | 5,847 | 4,245 |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 3,644 | 5,820 | 4,006
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 781,921 | 692,987 | 561,903
Ending balance |  |  |  |  |  |  |  |  |  |  |  | 645 | 1,337 | 1,368
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  | 107 |  | 107 |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  | 107 |  |  |
Beginning Balance |  |  |  |  |  |  |  | 107 |  | 107 |  |  |  |
Ending balance: loans acquired with deteriorated credit quality |  |  |  |  |  |  |  | 107 |  | 107 | 107 |  |  | 107
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  | 107 |  |  |
Real estate Residential |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 4,707 |  |  |  | 4,082 | 4,707 | 4,082 | 3,690 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (533) | (339) | (523) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 44 | 69 | 26 |  |  |
Provisions |  |  |  |  |  |  |  |  | 762 | 895 | 889 |  |  |
Ending balance | 4,980 |  |  |  | 4,707 |  |  |  | 4,980 | 4,707 | 4,082 |  |  |
Beginning Balance |  |  |  | 4,707 |  |  |  | 4,082 | 4,707 | 4,082 | 3,690 |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 336 | 520 | 1,138
Charge-offs |  |  |  |  |  |  |  |  | (533) | (339) | (523) |  |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 4,644 | 4,187 | 2,944
Recoveries |  |  |  |  |  |  |  |  | 44 | 69 | 26 |  |  |
Ending balance: loans acquired with deteriorated credit quality | 4,980 |  |  | 4,707 | 4,707 |  |  | 4,082 | 4,707 | 4,082 | 3,690 | 4,980 | 4,707 | 4,082
Provisions |  |  |  |  |  |  |  |  | 762 | 895 | 889 |  |  |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Loans |  |  |  |  |  |  |  |  |  |  |  | 287,935 | 289,781 | 306,218
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 3,763 | 3,543 | 4,917
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 284,142 | 286,201 | 301,252
Ending balance |  |  |  |  |  |  |  |  |  |  |  | 30 | 37 | 49
Total Loans |  |  |  |  |  |  |  |  |  |  |  | 287,935 | 289,781 | 306,218
Ending balance | 4,980 |  |  |  | 4,707 |  |  |  | 4,980 | 4,707 | 4,082 |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 3,763 | 3,543 | 4,917
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 284,142 | 286,201 | 301,252
Ending balance |  |  |  |  |  |  |  |  |  |  |  | 30 | 37 | 49
Consumer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 1,608 |  |  |  | 1,583 | 1,608 | 1,583 | 1,290 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (737) | (495) | (333) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 160 | 177 | 117 |  |  |
Provisions |  |  |  |  |  |  |  |  | 349 | 343 | 509 |  |  |
Ending balance | 1,380 |  |  |  | 1,608 |  |  |  | 1,380 | 1,608 | 1,583 |  |  |
Beginning Balance |  |  |  | 1,608 |  |  |  | 1,583 | 1,608 | 1,583 | 1,290 |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 8 |  | 117
Charge-offs |  |  |  |  |  |  |  |  | (737) | (495) | (333) |  |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,372 | 1,608 | 1,466
Recoveries |  |  |  |  |  |  |  |  | 160 | 177 | 117 |  |  |
Ending balance: loans acquired with deteriorated credit quality | 1,380 |  |  | $ 1,608 | 1,608 |  |  | 1,583 | 1,608 | 1,583 | 1,290 | 1,380 | 1,608 | 1,583
Provisions |  |  |  |  |  |  |  |  | 349 | 343 | 509 |  |  |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Loans |  |  |  |  |  |  |  |  |  |  |  | 142,721 | 134,226 | 101,603
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 177 | 155 | 148
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 142,544 | 134,071 | 101,455
Total Loans |  |  |  |  |  |  |  |  |  |  |  | 142,721 | 134,226 | 101,603
Ending balance | $ 1,380 |  |  |  | $ 1,608 |  |  |  | $ 1,380 | 1,608 | 1,583 |  |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 177 | 155 | 148
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | $ 142,544 | $ 134,071 | 101,455
Unallocated |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  | 23 |  | 23 |  |  |  |
Provisions |  |  |  |  |  |  |  |  |  | (23) | 23 |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  | 23 |  |  |
Beginning Balance |  |  |  |  |  |  |  | 23 |  | 23 |  |  |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | 23
Ending balance: loans acquired with deteriorated credit quality |  |  |  |  |  |  |  | $ 23 |  | 23 | 23 |  |  | $ 23
Provisions |  |  |  |  |  |  |  |  |  | $ (23) | 23 |  |  |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  | $ 23 |  |  |

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + 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 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=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 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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- 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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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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