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Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses - USD ($) $ in Thousands | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014
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Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment | $ 9,674 |  | $ 6,725 |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 23,089 |  | 19,847 |  |  |
Allowance for loan and lease losses, acquired portfolio |  |  |  |  |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |  |  |
Allowance for loan and lease losses, total | 32,763 | $ 29,074 | 26,572 | $ 17,480 | $ 15,933 | $ 14,160
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 120,053 |  | 107,104 |  |  |
Loans Receivable, collectively evaluated for impairment | 2,449,982 |  | 2,118,631 |  |  |
Loans Receivable, acquired portfolio | 799,851 |  | 866,878 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 8,058 |  | 9,181 |  |  |
Loans Receivable, Total | 3,377,944 |  | 3,101,794 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment | 9,674 |  | 6,725 |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 5,874 |  | 4,224 |  |  |
Allowance for loan and lease losses, acquired portfolio |  |  |  |  |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |  |  |
Allowance for loan and lease losses, total | 15,548 | 13,097 | 10,949 | 4,633 | 3,927 | 3,083
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 99,214 |  | 85,397 |  |  |
Loans Receivable, collectively evaluated for impairment | 464,080 |  | 395,424 |  |  |
Loans Receivable, acquired portfolio | 60,103 |  | 82,217 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 7,028 |  | 7,078 |  |  |
Loans Receivable, Total | 630,425 |  | 570,116 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment |  |  |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 11,371 |  | 10,926 |  |  |
Allowance for loan and lease losses, acquired portfolio |  |  |  |  |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |  |  |
Allowance for loan and lease losses, total | 11,371 | 10,941 | 10,926 | 9,195 | 8,846 | 7,799
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 16,386 |  | 15,517 |  |  |
Loans Receivable, collectively evaluated for impairment | 1,406,028 |  | 1,269,140 |  |  |
Loans Receivable, acquired portfolio | 648,325 |  | 680,264 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 1,030 |  | 1,775 |  |  |
Loans Receivable, Total | 2,071,769 |  | 1,966,696 |  |  |
Construction Loans [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment |  |  |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 4,040 |  | 3,253 |  |  |
Allowance for loan and lease losses, acquired portfolio |  |  |  |  |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |  |  |
Allowance for loan and lease losses, total | 4,040 | 3,617 | 3,253 | 1,945 | 1,518 | 1,239
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 1,053 |  | 2,149 |  |  |
Loans Receivable, collectively evaluated for impairment | 434,402 |  | 315,785 |  |  |
Loans Receivable, acquired portfolio | 7,822 |  | 10,904 |  |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |  |  |
Loans Receivable, Total | 443,277 |  | 328,838 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment |  |  |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 1,091 |  | 976 |  |  |
Allowance for loan and lease losses, acquired portfolio |  |  |  |  |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |  |  |
Allowance for loan and lease losses, total | 1,091 | 1,074 | 976 | 1,161 | 981 | 1,113
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 3,324 |  | 3,954 |  |  |
Loans Receivable, collectively evaluated for impairment | 144,204 |  | 136,633 |  |  |
Loans Receivable, acquired portfolio | 82,969 |  | 92,775 |  |  |
Loans Receivables, acquired with deteriorated credit quality |  |  | 328 |  |  |
Loans Receivable, Total | 230,497 |  | 233,690 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment |  |  |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 4 |  | 4 |  |  |
Allowance for loan and lease losses, acquired portfolio |  |  |  |  |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |  |  |
Allowance for loan and lease losses, total | 4 | 4 | 4 | 7 | 4 | 7
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 76 |  | 87 |  |  |
Loans Receivable, collectively evaluated for impairment | 1,268 |  | 1,649 |  |  |
Loans Receivable, acquired portfolio | 632 |  | 718 |  |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |  |  |
Loans Receivable, Total | 1,976 |  | 2,454 |  |  |
Unallocated [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment |  |  |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 709 |  | 464 |  |  |
Allowance for loan and lease losses, acquired portfolio |  |  |  |  |  |
Allowance for loan and lease losses, acquired with deteriorated credit quality |  |  |  |  |  |
Allowance for loan and lease losses, total | 709 | $ 341 | 464 | $ 539 | $ 657 | $ 919
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment |  |  |  |  |  |
Loans Receivable, collectively evaluated for impairment |  |  |  |  |  |
Loans Receivable, acquired portfolio |  |  |  |  |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |  |  |
Loans Receivable, Total |  |  |  |  |  |

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