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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, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
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Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment | $ 3,001 |  | $ 262 |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 18,532 |  | 13,898 |  |  |
Allowance for loan and lease losses, total | 21,533 | $ 17,480 | 14,160 | $ 12,118 | $ 10,825 | $ 10,333
Loans receivable |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 89,982 |  | 13,459 |  |  |
Loans Receivable, collectively evaluated for impairment | 2,856,519 |  | 2,516,251 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 9,168 |  | 9,821 |  |  |
Loans Receivable, Total | 2,955,669 |  | 2,539,531 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Loans receivable |  |  |  |  |  |
Loans Receivables, acquired with deteriorated credit quality | 9,168 |  | 9,821 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment | 3,001 |  | 111 |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 4,122 |  | 2,972 |  |  |
Allowance for loan and lease losses, total | 7,123 | 4,633 | 3,083 | 2,478 | 2,412 | 1,698
Loans receivable |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 80,414 |  | 868 |  |  |
Loans Receivable, collectively evaluated for impairment | 482,145 |  | 491,749 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 7,046 |  | 7,199 |  |  |
Loans Receivable, Total | 569,605 |  | 499,816 |  |  |
Commercial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Loans receivable |  |  |  |  |  |
Loans Receivables, acquired with deteriorated credit quality | 7,046 |  | 7,199 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, individually evaluated for impairment |  |  | 151 |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 10,274 |  | 7,648 |  |  |
Allowance for loan and lease losses, total | 10,274 | 9,195 | 7,799 | 7,022 | 5,741 | 5,746
Loans receivable |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 4,830 |  | 9,410 |  |  |
Loans Receivable, collectively evaluated for impairment | 1,867,085 |  | 1,623,384 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 1,799 |  | 1,816 |  |  |
Loans Receivable, Total | 1,873,714 |  | 1,634,510 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Loans receivable |  |  |  |  |  |
Loans Receivables, acquired with deteriorated credit quality | 1,799 |  | 1,816 |  |  |
Construction Loans [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 2,646 |  | 1,239 |  |  |
Allowance for loan and lease losses, total | 2,646 | 1,945 | 1,239 | 524 | 504 | 362
Loans receivable |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 1,479 |  |  |  |  |
Loans Receivable, collectively evaluated for impairment | 282,144 |  | 167,359 |  |  |
Loans Receivable, Total | 283,623 |  | 167,359 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 1,012 |  | 1,113 |  |  |
Allowance for loan and lease losses, total | 1,012 | 1,161 | 1,113 | 1,052 | 1,011 | 990
Loans receivable |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 3,164 |  | 3,072 |  |  |
Loans Receivable, collectively evaluated for impairment | 221,671 |  | 231,809 |  |  |
Loans Receivables, acquired with deteriorated credit quality | 323 |  | 806 |  |  |
Loans Receivable, Total | 225,158 |  | 234,967 |  |  |
Residential Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Loans receivable |  |  |  |  |  |
Loans Receivables, acquired with deteriorated credit quality | 323 |  | 806 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 4 |  | 7 |  |  |
Allowance for loan and lease losses, total | 4 | 7 | 7 | 5 | 63 | 146
Loans receivable |  |  |  |  |  |
Loans Receivable, individually evaluated for impairment | 95 |  | 109 |  |  |
Loans Receivable, collectively evaluated for impairment | 3,474 |  | 2,770 |  |  |
Loans Receivable, Total | 3,569 |  | 2,879 |  |  |
Unallocated Financing Receivables [Member] |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |
Allowance for loan and lease losses, collectively evaluated for impairment | 474 |  | 919 |  |  |
Allowance for loan and lease losses, total | $ 474 | $ 535 | $ 919 | $ 1,037 | $ 1,364 | $ 1,391

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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