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Loans and the Allowance for Loan Losses (Details) - Credit quality indicators - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | $ 3,892,427 | $ 3,479,441
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 641,613 | 553,576
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 2,585,205 | 2,204,710
Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 399,453 | 486,228
Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 264,244 | 232,547
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 1,912 | 2,380
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 3,825,604 | 3,405,931
Pass [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 630,818 | 539,961
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 2,535,005 | 2,154,343
Pass [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 393,625 | 480,319
Pass [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 264,244 | 228,990
Pass [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 1,912 | 2,318
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 37,996 | 37,816
Special Mention [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 3,882 | 3,255
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 30,875 | 31,173
Special Mention [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 3,239 | 3,388
Special Mention [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans |  |
Special Mention [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans |  |
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 28,827 | 35,694
Substandard [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 6,913 | 10,360
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 19,325 | 19,194
Substandard [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans | 2,589 | 2,521
Substandard [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans |  | 3,557
Substandard [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans |  | 62
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans |  |
Doubtful [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans |  |
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans |  |
Doubtful [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans |  |
Doubtful [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans |  |
Doubtful [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross loans |  |

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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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