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Loans and the Allowance for Loan Losses (Details) - Allowance for loan and lease losses - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Allowance for loan losses |  |  |  |
Allowance for loan losses, individually evaluated for impairment | $ 96 | $ 145 |  |
Allowance for loan losses, collectively evaluated for impairment | 26,255 | 25,599 |  |
Allowance for loan losses, acquired portfolio | 550 |  |  |
Allowance for loan losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses, total | 26,901 | 25,744 | $ 29,074 | $ 26,572
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 25,314 | 30,991 |  |
Loans Receivable, collectively evaluated for impairment | 2,950,555 | 2,783,922 |  |
Loans Receivable, acquired portfolio | 590,843 | 656,448 |  |
Loans Receivables, acquired with deteriorated credit quality | 8,117 | 8,080 |  |
Loans Receivable, Total | 3,574,829 | 3,479,441 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, individually evaluated for impairment |  |  |  |
Allowance for loan losses, collectively evaluated for impairment | 6,667 | 6,632 |  |
Allowance for loan losses, acquired portfolio |  |  |  |
Allowance for loan losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses, total | 6,667 | 6,632 | 13,097 | 10,949
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 2,862 | 3,637 |  |
Loans Receivable, collectively evaluated for impairment | 510,263 | 517,869 |  |
Loans Receivable, acquired portfolio | 20,738 | 24,972 |  |
Loans Receivables, acquired with deteriorated credit quality | 7,827 | 7,098 |  |
Loans Receivable, Total | 541,690 | 553,576 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, individually evaluated for impairment | 96 | 145 |  |
Allowance for loan losses, collectively evaluated for impairment | 13,472 | 12,438 |  |
Allowance for loan losses, acquired portfolio | 550 |  |  |
Allowance for loan losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses, total | 14,118 | 12,583 | 10,941 | 10,926
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 17,174 | 19,532 |  |
Loans Receivable, collectively evaluated for impairment | 1,806,502 | 1,621,745 |  |
Loans Receivable, acquired portfolio | 502,868 | 562,451 |  |
Loans Receivables, acquired with deteriorated credit quality | 290 | 982 |  |
Loans Receivable, Total | 2,326,834 | 2,204,710 |  |
Construction Loans [Member] |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, individually evaluated for impairment |  |  |  |
Allowance for loan losses, collectively evaluated for impairment | 4,574 | 4,789 |  |
Allowance for loan losses, acquired portfolio |  |  |  |
Allowance for loan losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses, total | 4,574 | 4,789 | 3,617 | 3,253
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 4,245 | 5,909 |  |
Loans Receivable, collectively evaluated for impairment | 455,574 | 478,865 |  |
Loans Receivable, acquired portfolio | 792 | 1,454 |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |
Loans Receivable, Total | 460,611 | 486,228 |  |
Residential Portfolio Segment [Member] |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, individually evaluated for impairment |  |  |  |
Allowance for loan losses, collectively evaluated for impairment | 1,008 | 958 |  |
Allowance for loan losses, acquired portfolio |  |  |  |
Allowance for loan losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses, total | 1,008 | 958 | 1,074 | 976
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 976 | 1,851 |  |
Loans Receivable, collectively evaluated for impairment | 175,973 | 163,686 |  |
Loans Receivable, acquired portfolio | 65,934 | 67,010 |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |
Loans Receivable, Total | 242,883 | 232,547 |  |
Consumer Portfolio Segment [Member] |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, individually evaluated for impairment |  |  |  |
Allowance for loan losses, collectively evaluated for impairment | 3 | 3 |  |
Allowance for loan losses, acquired portfolio |  |  |  |
Allowance for loan losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses, total | 3 | 3 | 4 | 4
Gross loans |  |  |  |
Loans Receivable, individually evaluated for impairment | 57 | 62 |  |
Loans Receivable, collectively evaluated for impairment | 2,243 | 1,757 |  |
Loans Receivable, acquired portfolio | 511 | 561 |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |
Loans Receivable, Total | 2,811 | 2,380 |  |
Unallocated [Member] |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, individually evaluated for impairment |  |  |  |
Allowance for loan losses, collectively evaluated for impairment | 531 | 779 |  |
Allowance for loan losses, acquired portfolio |  |  |  |
Allowance for loan losses, acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses, total | $ 531 | $ 779 | $ 341 | $ 464

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