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Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses - USD ($) $ in Thousands | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
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Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment | $ 13,036 |  | $ 6,725 |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 24,579 |  | 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 | 37,615 | $ 32,763 | 26,572 | $ 21,533 | $ 17,480 | $ 14,160
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 116,831 |  | 107,104 |  |  |
Loans Receivable, collectively evaluated for impairment | 2,586,869 |  | 2,118,631 |  |  |
Loans Receivable, acquired portfolio | 736,894 |  | 866,878 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 8,029 |  | 9,181 |  |  |
Loans Receivable, Total | 3,448,623 |  | 3,101,794 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment | 12,931 |  | 6,725 |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 7,465 |  | 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 | 20,396 | 15,548 | 10,949 | 7,123 | 4,633 | 3,083
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 102,682 |  | 85,397 |  |  |
Loans Receivable, collectively evaluated for impairment | 487,657 |  | 395,424 |  |  |
Loans Receivable, acquired portfolio | 47,064 |  | 82,217 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 7,027 |  | 7,078 |  |  |
Loans Receivable, Total | 644,430 |  | 570,116 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment | 105 |  |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 11,270 |  | 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 | 11,375 | 11,371 | 10,926 | 10,274 | 9,195 | 7,799
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 9,319 |  | 15,517 |  |  |
Loans Receivable, collectively evaluated for impairment | 1,480,859 |  | 1,269,140 |  |  |
Loans Receivable, acquired portfolio | 609,624 |  | 680,264 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 1,002 |  | 1,775 |  |  |
Loans Receivable, Total | 2,100,804 |  | 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 | 4,072 |  | 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 | 4,072 | 4,040 | 3,253 | 2,646 | 1,945 | 1,239
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 1,374 |  | 2,149 |  |  |
Loans Receivable, collectively evaluated for impairment | 462,687 |  | 315,785 |  |  |
Loans Receivable, acquired portfolio | 7,048 |  | 10,904 |  |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |  |  |
Loans Receivable, Total | 471,109 |  | 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 | 1,174 |  | 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 | 1,174 | 1,091 | 976 | 1,012 | 1,161 | 1,113
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 3,389 |  | 3,954 |  |  |
Loans Receivable, collectively evaluated for impairment | 153,488 |  | 136,633 |  |  |
Loans Receivable, acquired portfolio | 72,524 |  | 92,775 |  |  |
Loans Receivables, acquired with deteriorated credit quality |  |  | 328 |  |  |
Loans Receivable, Total | 229,401 |  | 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 | 4 | 7 | 7
Gross loans |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 67 |  | 87 |  |  |
Loans Receivable, collectively evaluated for impairment | 2,178 |  | 1,649 |  |  |
Loans Receivable, acquired portfolio | 634 |  | 718 |  |  |
Loans Receivables, acquired with deteriorated credit quality |  |  |  |  |  |
Loans Receivable, Total | 2,879 |  | 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 | 594 |  | 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 | 594 | $ 709 | 464 | $ 474 | $ 539 | $ 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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