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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 | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance | $ 17,802 | $ 14,799 | $ 15,961 | $ 12,975 |  |
Charge-offs | (268) | (355) | (1,010) | (1,110) |  |
Recoveries | 97 | 68 | 280 | 247 |  |
Provisions | 1,200 | 1,200 | 3,600 | 3,600 |  |
Ending balance | 18,831 | 15,712 | 18,831 | 15,712 |  |
Beginning Balance | 17,802 | 14,799 | 15,961 | 12,975 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | $ 1,706 | $ 1,942
Charge-offs | (268) | (355) | (1,010) | (1,110) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  | 17,125 | 14,019
Recoveries | 97 | 68 | 280 | 247 |  |
Ending balance: loans acquired with deteriorated credit quality | 17,802 | 14,799 | 15,961 | 12,975 | 18,831 | 15,961
Provisions | 1,200 | 1,200 | 3,600 | 3,600 |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 1,632,515 | 1,532,965
Ending balance: individually evaluated for impairment |  |  |  |  | 10,742 | 11,242
Ending balance: collectively evaluated for impairment |  |  |  |  | 1,620,743 | 1,519,386
Total Loans |  |  |  |  | 1,632,515 | 1,532,965
Ending balance | 18,831 | 15,712 | 18,831 | 15,712 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 10,742 | 11,242
Ending balance: collectively evaluated for impairment |  |  |  |  | 1,620,743 | 1,519,386
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance |  |  |  |  | 1,030 | 2,337
Ending balance |  |  |  |  | 1,030 | 2,337
Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance | 4,426 | 3,263 | 3,799 | 3,042 |  |
Charge-offs | (17) |  | (49) | (396) |  |
Recoveries | 3 | 2 | 16 | 38 |  |
Provisions | 358 | 321 | 1,004 | 902 |  |
Ending balance | 4,770 | 3,586 | 4,770 | 3,586 |  |
Beginning Balance | 4,426 | 3,263 | 3,799 | 3,042 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 436 | 225
Charge-offs | (17) |  | (49) | (396) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  | 4,334 | 3,574
Recoveries | 3 | 2 | 16 | 38 |  |
Ending balance: loans acquired with deteriorated credit quality | 4,426 | 3,263 | 3,799 | 3,042 | 4,770 | 3,799
Provisions | 358 | 321 | 1,004 | 902 |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 449,464 | 408,814
Ending balance: individually evaluated for impairment |  |  |  |  | 2,789 | 1,724
Ending balance: collectively evaluated for impairment |  |  |  |  | 446,322 | 406,127
Total Loans |  |  |  |  | 449,464 | 408,814
Ending balance | 4,770 | 3,586 | 4,770 | 3,586 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 2,789 | 1,724
Ending balance: collectively evaluated for impairment |  |  |  |  | 446,322 | 406,127
Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance |  |  |  |  | 353 | 963
Ending balance |  |  |  |  | 353 | 963
Real estate Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance | 6,587 | 5,077 | 5,847 | 4,245 |  |
Charge-offs |  | (72) | (367) | (175) |  |
Recoveries | 41 | 28 | 96 | 58 |  |
Provisions | 566 | 548 | 1,618 | 1,453 |  |
Ending balance | 7,194 | 5,581 | 7,194 | 5,581 |  |
Beginning Balance | 6,587 | 5,077 | 5,847 | 4,245 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 631 | 1,197
Charge-offs |  | (72) | (367) | (175) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  | 6,563 | 4,650
Recoveries | 41 | 28 | 96 | 58 |  |
Ending balance: loans acquired with deteriorated credit quality | 6,587 | 5,077 | 5,847 | 4,245 | 7,194 | 5,847
Provisions | 566 | 548 | 1,618 | 1,453 |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 751,510 | 700,144
Ending balance: individually evaluated for impairment |  |  |  |  | 4,062 | 5,820
Ending balance: collectively evaluated for impairment |  |  |  |  | 746,802 | 692,987
Total Loans |  |  |  |  | 751,510 | 700,144
Ending balance | 7,194 | 5,581 | 7,194 | 5,581 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 4,062 | 5,820
Ending balance: collectively evaluated for impairment |  |  |  |  | 746,802 | 692,987
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance |  |  |  |  | 646 | 1,337
Ending balance |  |  |  |  | 646 | 1,337
Real estate Residential |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance | 5,196 | 4,465 | 4,707 | 4,082 |  |
Charge-offs | (82) | (153) | (105) | (279) |  |
Recoveries | 4 | 4 | 30 | 39 |  |
Provisions | 175 | 245 | 661 | 719 |  |
Ending balance | 5,293 | 4,561 | 5,293 | 4,561 |  |
Beginning Balance | 5,196 | 4,465 | 4,707 | 4,082 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 616 | 520
Charge-offs | (82) | (153) | (105) | (279) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  | 4,677 | 4,187
Recoveries | 4 | 4 | 30 | 39 |  |
Ending balance: loans acquired with deteriorated credit quality | 5,196 | 4,465 | 4,707 | 4,082 | 5,293 | 4,707
Provisions | 175 | 245 | 661 | 719 |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 289,582 | 289,781
Ending balance: individually evaluated for impairment |  |  |  |  | 3,697 | 3,543
Ending balance: collectively evaluated for impairment |  |  |  |  | 285,854 | 286,201
Total Loans |  |  |  |  | 289,582 | 289,781
Ending balance | 5,293 | 4,561 | 5,293 | 4,561 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 3,697 | 3,543
Ending balance: collectively evaluated for impairment |  |  |  |  | 285,854 | 286,201
Real estate Residential | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance |  |  |  |  | 31 | 37
Ending balance |  |  |  |  | 31 | 37
Consumer |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance | 1,593 | 1,679 | 1,608 | 1,583 |  |
Charge-offs | (169) | (130) | (489) | (260) |  |
Recoveries | 49 | 34 | 138 | 112 |  |
Provisions | 101 | 86 | 317 | 234 |  |
Ending balance | 1,574 | 1,669 | 1,574 | 1,669 |  |
Beginning Balance | 1,593 | 1,679 | 1,608 | 1,583 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 23 |
Charge-offs | (169) | (130) | (489) | (260) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  | 1,551 | 1,608
Recoveries | 49 | 34 | 138 | 112 |  |
Ending balance: loans acquired with deteriorated credit quality | 1,593 | 1,679 | 1,608 | 1,583 | 1,574 | 1,608
Provisions | 101 | 86 | 317 | 234 |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 141,959 | 134,226
Ending balance: individually evaluated for impairment |  |  |  |  | 194 | 155
Ending balance: collectively evaluated for impairment |  |  |  |  | 141,765 | 134,071
Total Loans |  |  |  |  | 141,959 | 134,226
Ending balance | $ 1,574 | 1,669 | $ 1,574 | 1,669 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 194 | 155
Ending balance: collectively evaluated for impairment |  |  |  |  | $ 141,765 | $ 134,071
Unallocated |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance |  | 315 |  | 23 |  |
Provisions |  |  |  | 292 |  |
Ending balance |  | 315 |  | 315 |  |
Beginning Balance |  | 315 |  | 23 |  |
Ending balance: loans acquired with deteriorated credit quality |  | 315 |  | 23 |  |
Provisions |  |  |  | 292 |  |
Loans receivable: |  |  |  |  |  |
Ending balance |  | $ 315 |  | $ 315 |  |

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