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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 | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2016
Allowance for loan losses: |  |  |  |  |  |  |
Beginning Balance | $ 16,969 | $ 14,158 | $ 12,975 | $ 15,961 | $ 12,975 |  |
Charge-offs | (431) |  | (632) | (742) | (755) |  |
Recoveries | 64 |  | 73 | 183 | 179 |  |
Provisions | 1,200 | 1,200 | 1,200 | 2,400 | 2,400 |  |
Ending balance | 17,802 | 14,799 | 14,158 | 17,802 | 14,799 |  |
Beginning Balance | 16,969 | 14,158 | 12,975 | 15,961 | 12,975 |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  | $ 1,335 | $ 1,942
Charge-offs | (431) |  | (632) | (742) | (755) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 16,467 | 14,019
Recoveries | 64 |  | 73 | 183 | 179 |  |
Ending balance: loans acquired with deteriorated credit quality | 16,969 | 14,158 | 12,975 | 15,961 | 12,975 | 17,802 | 15,961
Provisions | 1,200 | 1,200 | 1,200 | 2,400 | 2,400 |  |
Loans receivable: |  |  |  |  |  |  |
Total Loans |  |  |  |  |  | 1,597,362 | 1,532,965
Ending balance: individually evaluated for impairment |  |  |  |  |  | 9,412 | 11,242
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 1,586,905 | 1,519,386
Total Loans |  |  |  |  |  | 1,597,362 | 1,532,965
Ending balance | 17,802 | 14,799 | 14,158 | 17,802 | 14,799 |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  | 9,412 | 11,242
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 1,586,905 | 1,519,386
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |  |
Ending balance |  |  |  |  |  | 1,045 | 2,337
Ending balance |  |  |  |  |  | 1,045 | 2,337
Commercial |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |
Beginning Balance | 4,129 | 3,322 | 3,042 | 3,799 | 3,042 |  |
Charge-offs | (32) |  | (393) | (32) | (396) |  |
Recoveries | 6 |  | 34 | 13 | 36 |  |
Provisions | 323 |  | 300 | 646 | 581 |  |
Ending balance | 4,426 | 3,263 | 3,322 | 4,426 | 3,263 |  |
Beginning Balance | 4,129 | 3,322 | 3,042 | 3,799 | 3,042 |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  | 322 | 225
Charge-offs | (32) |  | (393) | (32) | (396) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 4,104 | 3,574
Recoveries | 6 |  | 34 | 13 | 36 |  |
Ending balance: loans acquired with deteriorated credit quality | 4,129 | 3,322 | 3,042 | 3,799 | 3,042 | 4,426 | 3,799
Provisions | 323 |  | 300 | 646 | 581 |  |
Loans receivable: |  |  |  |  |  |  |
Total Loans |  |  |  |  |  | 452,180 | 408,814
Ending balance: individually evaluated for impairment |  |  |  |  |  | 1,944 | 1,724
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 449,868 | 406,127
Total Loans |  |  |  |  |  | 452,180 | 408,814
Ending balance | 4,426 | 3,263 | 3,322 | 4,426 | 3,263 |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  | 1,944 | 1,724
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 449,868 | 406,127
Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |  |
Ending balance |  |  |  |  |  | 368 | 963
Ending balance |  |  |  |  |  | 368 | 963
Real estate Commercial |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |
Beginning Balance | 6,291 | 4,616 | 4,245 | 5,847 | 4,245 |  |
Charge-offs | (242) |  | (48) | (367) | (103) |  |
Recoveries | 22 |  | 14 | 55 | 30 |  |
Provisions | 516 |  | 495 | 1,052 | 905 |  |
Ending balance | 6,587 | 5,077 | 4,616 | 6,587 | 5,077 |  |
Beginning Balance | 6,291 | 4,616 | 4,245 | 5,847 | 4,245 |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  | 509 | 1,197
Charge-offs | (242) |  | (48) | (367) | (103) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 6,078 | 4,650
Recoveries | 22 |  | 14 | 55 | 30 |  |
Ending balance: loans acquired with deteriorated credit quality | 6,291 | 4,616 | 4,245 | 5,847 | 4,245 | 6,587 | 5,847
Provisions | 516 |  | 495 | 1,052 | 905 |  |
Loans receivable: |  |  |  |  |  |  |
Total Loans |  |  |  |  |  | 719,652 | 700,144
Ending balance: individually evaluated for impairment |  |  |  |  |  | 3,951 | 5,820
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 715,056 | 692,987
Total Loans |  |  |  |  |  | 719,652 | 700,144
Ending balance | 6,587 | 5,077 | 4,616 | 6,587 | 5,077 |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  | 3,951 | 5,820
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 715,056 | 692,987
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |  |
Ending balance |  |  |  |  |  | 645 | 1,337
Ending balance |  |  |  |  |  | 645 | 1,337
Real estate Residential |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |
Beginning Balance | 4,978 | 4,359 | 4,082 | 4,707 | 4,082 |  |
Charge-offs | (8) |  | (126) | (23) | (126) |  |
Recoveries | 4 |  | 10 | 26 | 35 |  |
Provisions | 222 |  | 222 | 486 | 474 |  |
Ending balance | 5,196 | 4,465 | 4,359 | 5,196 | 4,465 |  |
Beginning Balance | 4,978 | 4,359 | 4,082 | 4,707 | 4,082 |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  | 461 | 520
Charge-offs | (8) |  | (126) | (23) | (126) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 4,735 | 4,187
Recoveries | 4 |  | 10 | 26 | 35 |  |
Ending balance: loans acquired with deteriorated credit quality | 4,978 | 4,359 | 4,082 | 4,707 | 4,082 | 5,196 | 4,707
Provisions | 222 |  | 222 | 486 | 474 |  |
Loans receivable: |  |  |  |  |  |  |
Total Loans |  |  |  |  |  | 286,232 | 289,781
Ending balance: individually evaluated for impairment |  |  |  |  |  | 3,285 | 3,543
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 282,915 | 286,201
Total Loans |  |  |  |  |  | 286,232 | 289,781
Ending balance | 5,196 | 4,465 | 4,359 | 5,196 | 4,465 |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  | 3,285 | 3,543
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 282,915 | 286,201
Real estate Residential | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |  |
Ending balance |  |  |  |  |  | 32 | 37
Ending balance |  |  |  |  |  | 32 | 37
Consumer |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |
Beginning Balance | 1,571 | 1,646 | 1,583 | 1,608 | 1,583 |  |
Charge-offs | (149) |  | (65) | (320) | (130) |  |
Recoveries | 32 |  | 15 | 89 | 78 |  |
Provisions | 139 |  | 83 | 216 | 148 |  |
Ending balance | 1,593 | 1,679 | 1,646 | 1,593 | 1,679 |  |
Beginning Balance | 1,571 | 1,646 | 1,583 | 1,608 | 1,583 |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  | 43 |
Charge-offs | (149) |  | (65) | (320) | (130) |  |
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 1,550 | 1,608
Recoveries | 32 |  | 15 | 89 | 78 |  |
Ending balance: loans acquired with deteriorated credit quality | 1,571 | 1,646 | 1,583 | 1,608 | 1,583 | 1,593 | 1,608
Provisions | 139 |  | 83 | 216 | 148 |  |
Loans receivable: |  |  |  |  |  |  |
Total Loans |  |  |  |  |  | 139,298 | 134,226
Ending balance: individually evaluated for impairment |  |  |  |  |  | 232 | 155
Ending balance: collectively evaluated for impairment |  |  |  |  |  | 139,066 | 134,071
Total Loans |  |  |  |  |  | 139,298 | 134,226
Ending balance | $ 1,593 | 1,679 | 1,646 | $ 1,593 | 1,679 |  |
Ending balance: individually evaluated for impairment |  |  |  |  |  | 232 | 155
Ending balance: collectively evaluated for impairment |  |  |  |  |  | $ 139,066 | $ 134,071
Unallocated |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |
Beginning Balance |  | 215 | 23 |  | 23 |  |
Provisions |  |  | 100 |  | 292 |  |
Ending balance |  | 315 | 215 |  | 315 |  |
Beginning Balance |  | 215 | 23 |  | 23 |  |
Ending balance: loans acquired with deteriorated credit quality |  | 215 | 23 |  | 23 |  |
Provisions |  |  | 100 |  | 292 |  |
Loans receivable: |  |  |  |  |  |  |
Ending balance |  | $ 315 | $ 215 |  | $ 315 |  |

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