Loans and Allowance for Credit Losses (Details 2) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Recorded investment in loans:
Loans individually evaluated for impairment	$ 36,353	$ 34,471	$ 39,667
Loans collectively evaluated for impairment	5,948,678	5,643,422	5,363,762
Net loans	5,985,031	5,677,893	5,403,429
Commercial Portfolio Segment [Member]
Recorded investment in loans:
Loans individually evaluated for impairment	8,929	10,437	12,402
Loans collectively evaluated for impairment	1,310,807	1,190,291	1,128,461
Net loans	1,319,736	1,200,728	1,140,863
Income Producing Portfolio Segment [Member]
Recorded investment in loans:
Loans individually evaluated for impairment	12,339	15,057	19,778
Loans collectively evaluated for impairment	2,583,891	2,494,460	2,441,803
Net loans	2,596,230	2,509,517	2,461,581
Owner Occupied Portfolio Segment [Member]
Recorded investment in loans:
Loans individually evaluated for impairment	5,370	2,093	1,699
Loans collectively evaluated for impairment	654,696	638,777	582,659
Net loans	660,066	640,870	584,358
Residential Portfolio Segment [Member]
Recorded investment in loans:
Loans individually evaluated for impairment		241	254
Loans collectively evaluated for impairment	151,115	152,507	149,875
Net loans	151,115	152,748	150,129
Construction Portfolio Segment [Member]
Recorded investment in loans:
Loans individually evaluated for impairment	9,028	6,517	5,413
Loans collectively evaluated for impairment	1,142,451	1,052,052	941,918
Net loans	1,151,479	1,058,569	947,331
Home Equity Portfolio Segment [Member]
Recorded investment in loans:
Loans individually evaluated for impairment	594		121
Loans collectively evaluated for impairment	103,077	105,096	110,576
Net loans	103,671	105,096	110,697
Other Consumer Portfolio Segment [Member]
Recorded investment in loans:
Loans individually evaluated for impairment	93	126
Loans collectively evaluated for impairment	2,641	10,239	8,470
Net loans	$ 2,734	$ 10,365	$ 8,470

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- Definition

The balance of financing receivables that were collectively 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 (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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