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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance | $ 19,573 | $ 17,802 | $ 18,960 | $ 15,961 |  |
Charge-offs | (328) | (268) | (2,152) | (1,010) |  |
Recoveries | 118 | 97 | 455 | 280 |  |
Provisions | 1,050 | 1,200 | 3,150 | 3,600 |  |
Ending balance | 20,413 | 18,831 | 20,413 | 18,831 |  |
Beginning Balance | 19,573 | 17,802 | 18,960 | 15,961 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | $ 931 | $ 766
Charge-offs | (328) | (268) | (2,152) | (1,010) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  | 19,482 | 18,194
Recoveries | 118 | 97 | 455 | 280 |  |
Ending balance: loans acquired with deteriorated credit quality | 19,573 | 17,802 | 18,960 | 15,961 | 20,413 | 18,960
Provisions | 1,050 | 1,200 | 3,150 | 3,600 |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 1,779,445 | 1,693,065
Ending balance: individually evaluated for impairment |  |  |  |  | 10,341 | 9,705
Ending balance: collectively evaluated for impairment |  |  |  |  | 1,768,233 | 1,682,343
Total Loans |  |  |  |  | 1,779,445 | 1,693,065
Ending balance | 20,413 | 18,831 | 20,413 | 18,831 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 10,341 | 9,705
Ending balance: collectively evaluated for impairment |  |  |  |  | 1,768,233 | 1,682,343
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance |  |  |  |  | 871 | 1,017
Ending balance |  |  |  |  | 871 | 1,017
Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance | 5,749 | 4,426 | 5,052 | 3,799 |  |
Charge-offs | (148) | (17) | (150) | (49) |  |
Recoveries | 12 | 3 | 128 | 16 |  |
Provisions | 289 | 358 | 872 | 1,004 |  |
Ending balance | 5,902 | 4,770 | 5,902 | 4,770 |  |
Beginning Balance | 5,749 | 4,426 | 5,052 | 3,799 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 93 | 159
Charge-offs | (148) | (17) | (150) | (49) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  | 5,809 | 4,893
Recoveries | 12 | 3 | 128 | 16 |  |
Ending balance: loans acquired with deteriorated credit quality | 5,749 | 4,426 | 5,052 | 3,799 | 5,902 | 5,052
Provisions | 289 | 358 | 872 | 1,004 |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 478,128 | 476,199
Ending balance: individually evaluated for impairment |  |  |  |  | 1,996 | 2,121
Ending balance: collectively evaluated for impairment |  |  |  |  | 475,833 | 473,736
Total Loans |  |  |  |  | 478,128 | 476,199
Ending balance | 5,902 | 4,770 | 5,902 | 4,770 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 1,996 | 2,121
Ending balance: collectively evaluated for impairment |  |  |  |  | 475,833 | 473,736
Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance |  |  |  |  | 299 | 342
Ending balance |  |  |  |  | 299 | 342
Real estate Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance | 7,506 | 6,587 | 7,548 | 5,847 |  |
Charge-offs | (63) |  | (1,232) | (367) |  |
Recoveries | 26 | 41 | 83 | 96 |  |
Provisions | 536 | 566 | 1,606 | 1,618 |  |
Ending balance | 8,005 | 7,194 | 8,005 | 7,194 |  |
Beginning Balance | 7,506 | 6,587 | 7,548 | 5,847 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 462 | 263
Charge-offs | (63) |  | (1,232) | (367) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  | 7,543 | 7,285
Recoveries | 26 | 41 | 83 | 96 |  |
Ending balance: loans acquired with deteriorated credit quality | 7,506 | 6,587 | 7,548 | 5,847 | 8,005 | 7,548
Provisions | 536 | 566 | 1,606 | 1,618 |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 881,071 | 786,210
Ending balance: individually evaluated for impairment |  |  |  |  | 4,538 | 3,644
Ending balance: collectively evaluated for impairment |  |  |  |  | 875,988 | 781,921
Total Loans |  |  |  |  | 881,071 | 786,210
Ending balance | 8,005 | 7,194 | 8,005 | 7,194 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 4,538 | 3,644
Ending balance: collectively evaluated for impairment |  |  |  |  | 875,988 | 781,921
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance |  |  |  |  | 545 | 645
Ending balance |  |  |  |  | 545 | 645
Real estate Residential |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance | 4,962 | 5,196 | 4,980 | 4,707 |  |
Charge-offs |  | (82) | (381) | (105) |  |
Recoveries | 13 | 4 | 80 | 30 |  |
Provisions | 164 | 175 | 460 | 661 |  |
Ending balance | 5,139 | 5,293 | 5,139 | 5,293 |  |
Beginning Balance | 4,962 | 5,196 | 4,980 | 4,707 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 362 | 336
Charge-offs |  | (82) | (381) | (105) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  | 4,777 | 4,644
Recoveries | 13 | 4 | 80 | 30 |  |
Ending balance: loans acquired with deteriorated credit quality | 4,962 | 5,196 | 4,980 | 4,707 | 5,139 | 4,980
Provisions | 164 | 175 | 460 | 661 |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 297,819 | 287,935
Ending balance: individually evaluated for impairment |  |  |  |  | 3,651 | 3,763
Ending balance: collectively evaluated for impairment |  |  |  |  | 294,141 | 284,142
Total Loans |  |  |  |  | 297,819 | 287,935
Ending balance | 5,139 | 5,293 | 5,139 | 5,293 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 3,651 | 3,763
Ending balance: collectively evaluated for impairment |  |  |  |  | 294,141 | 284,142
Real estate Residential | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance |  |  |  |  | 27 | 30
Ending balance |  |  |  |  | 27 | 30
Real estate Residential |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 297,819 | 287,935
Total Loans |  |  |  |  | 297,819 | 287,935
Consumer |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning Balance | 1,356 | 1,593 | 1,380 | 1,608 |  |
Charge-offs | (117) | (169) | (389) | (489) |  |
Recoveries | 67 | 49 | 164 | 138 |  |
Provisions | 61 | 101 | 212 | 317 |  |
Ending balance | 1,367 | 1,574 | 1,367 | 1,574 |  |
Beginning Balance | 1,356 | 1,593 | 1,380 | 1,608 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 14 | 8
Charge-offs | (117) | (169) | (389) | (489) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  | 1,353 | 1,372
Recoveries | 67 | 49 | 164 | 138 |  |
Ending balance: loans acquired with deteriorated credit quality | 1,356 | 1,593 | 1,380 | 1,608 | 1,367 | 1,380
Provisions | 61 | 101 | 212 | 317 |  |
Loans receivable: |  |  |  |  |  |
Total Loans |  |  |  |  | 122,427 | 142,721
Ending balance: individually evaluated for impairment |  |  |  |  | 156 | 177
Ending balance: collectively evaluated for impairment |  |  |  |  | 122,271 | 142,544
Total Loans |  |  |  |  | 122,427 | 142,721
Ending balance | $ 1,367 | $ 1,574 | $ 1,367 | $ 1,574 |  |
Ending balance: individually evaluated for impairment |  |  |  |  | 156 | 177
Ending balance: collectively evaluated for impairment |  |  |  |  | $ 122,271 | $ 142,544

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