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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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+ References

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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

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