Loans and Credit Quality (Details 2) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 12,034,189	$ 11,882,432
NonCovered [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,811,551	11,591,641	$ 10,791,669
NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,415,670	5,340,560	5,236,452
NonCovered [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	343,500	307,135	298,477
NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,966,102	5,842,463	5,193,735
NonCovered [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	86,279	101,483	$ 63,005
NonCovered [Member] | Classified [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	379,988	242,611
NonCovered [Member] | Classified [Member] | Hospitality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	16,737	17,761
NonCovered [Member] | Classified [Member] | SBA Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,141	11,141
NonCovered [Member] | Classified [Member] | Real Estate Other Class [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	53,777	68,084
NonCovered [Member] | Classified [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	80,655	96,986
NonCovered [Member] | Classified [Member] | Residential Real Estate Construction Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	377	402
NonCovered [Member] | Classified [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,361	3,748
NonCovered [Member] | Classified [Member] | Commercial Real Estate Construction Loan Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	984	3,346
NonCovered [Member] | Classified [Member] | Collateralized Loan Obligations [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	19,250	22,433
NonCovered [Member] | Classified [Member] | Unsecured Commercial Member [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,609	1,323
NonCovered [Member] | Classified [Member] | Asset Based [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,675	11,547
NonCovered [Member] | Classified [Member] | Cash Flow [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	177,948	83,321
NonCovered [Member] | Classified [Member] | Equipment Finance Commercial Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	85,536	15,973
NonCovered [Member] | Classified [Member] | SBA Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,068	3,207
NonCovered [Member] | Classified [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	294,086	137,804
NonCovered [Member] | Classified [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,886	4,073
NonCovered [Member] | Nonclassified [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,431,563	11,349,030
NonCovered [Member] | Nonclassified [Member] | Hospitality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	579,922	542,458
NonCovered [Member] | Nonclassified [Member] | SBA Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	387,921	364,786
NonCovered [Member] | Nonclassified [Member] | Real Estate Other Class [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,367,172	4,336,330
NonCovered [Member] | Nonclassified [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,335,015	5,243,574
NonCovered [Member] | Nonclassified [Member] | Residential Real Estate Construction Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	119,428	96,326
NonCovered [Member] | Nonclassified [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	342,139	303,387
NonCovered [Member] | Nonclassified [Member] | Commercial Real Estate Construction Loan Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	222,711	207,061
NonCovered [Member] | Nonclassified [Member] | Collateralized Loan Obligations [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	352,541	416,754
NonCovered [Member] | Nonclassified [Member] | Unsecured Commercial Member [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	118,526	130,501
NonCovered [Member] | Nonclassified [Member] | Asset Based [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,833,778	1,783,304
NonCovered [Member] | Nonclassified [Member] | Cash Flow [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,505,518	2,376,530
NonCovered [Member] | Nonclassified [Member] | Equipment Finance Commercial Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	818,952	953,516
NonCovered [Member] | Nonclassified [Member] | SBA Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	42,701	44,054
NonCovered [Member] | Nonclassified [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,672,016	5,704,659
NonCovered [Member] | Nonclassified [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	82,393	97,410
Collateralized Loan Obligations [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	371,791	439,187
Unsecured Commercial Member [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	120,135	131,824
Asset Based [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,840,453	1,794,851
Cash Flow [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,683,466	2,459,851
Equipment Finance Commercial Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	904,488	969,489
SBA Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	45,769	47,261
Commercial Real Estate Construction Loan Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	223,695	210,407
Residential Real Estate Construction Financing Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	119,805	96,728
Hospitality [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	596,659	560,219
SBA Loans [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	398,062	375,927
Real Estate Other Class [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 4,420,949	$ 4,404,414