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Loans and the Allowance for Loan Losses (Details) - Credit quality indicators - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | $ 4,174,810 | $ 3,479,441
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 4,045,989 | 3,405,931
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 43,620 | 37,816
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 85,201 | 35,694
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount |  |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 824,082 | 553,576
Commercial Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 767,020 | 539,961
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 3,764 | 3,255
Commercial Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 53,298 | 10,360
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount |  |
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 2,592,909 | 2,204,710
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 2,534,973 | 2,154,343
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 34,335 | 31,173
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 23,601 | 19,194
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount |  |
Construction Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 483,216 | 486,228
Construction Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 475,066 | 480,319
Construction Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 5,521 | 3,388
Construction Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 2,629 | 2,521
Construction Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount |  |
Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 271,795 | 232,547
Residential Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 266,163 | 228,990
Residential Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount |  |
Residential Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 5,632 | 3,557
Residential Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount |  |
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 2,808 | 2,380
Consumer Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 2,767 | 2,318
Consumer Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount |  |
Consumer Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount | 41 | 62
Consumer Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount |  |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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