Loans and Credit Quality (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 12,272,166	$ 11,882,432	$ 4,161,067
Non-PCI nonaccrual loans	139,334	83,621
NonCovered [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	12,017,881	11,591,641	3,828,551
Financing Receivable, Recorded Investment, Nonaccrual Status	139,334	83,621
Non-PCI nonaccrual loans		11,591,641
NonCovered [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	93,675	101,483	66,782
Financing Receivable, Recorded Investment, Nonaccrual Status	3,474	3,485
NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,588,430	5,340,560	2,320,554
Financing Receivable, Recorded Investment, Nonaccrual Status	37,335	37,612
NonCovered [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	328,709	307,135	240,073
Financing Receivable, Recorded Investment, Nonaccrual Status	832	1,559
NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,007,067	5,842,463	1,201,142
Financing Receivable, Recorded Investment, Nonaccrual Status	97,693	40,965
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Hospitality [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,088	6,366
Nonperforming Financing Receivable [Member] | NonCovered [Member] | SBA Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,919	11,141
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Real Estate Other Class [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	18,328	20,105
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Residential Real Estate Construction Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	379	381
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	453	1,178
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Collateralized Loan Obligations [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,601	5,450
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Unsecured Commercial Member [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	594	639
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Asset Based [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,159	4,574
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Cash Flow [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	15,172	15,964
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Equipment Finance Commercial Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	71,039	11,131
Nonperforming Financing Receivable [Member] | NonCovered [Member] | SBA Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,128	3,207
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income		3,485
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income		37,612
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income		1,559
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income		40,965
Performing Financing Receivable [Member] | NonCovered [Member]
Financing Receivable, Impaired [Line Items]
Non-PCI nonaccrual loans	11,878,547	11,508,020
Performing Financing Receivable [Member] | NonCovered [Member] | Hospitality [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	604,001	553,853
Performing Financing Receivable [Member] | NonCovered [Member] | SBA Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	377,857	364,786
Performing Financing Receivable [Member] | NonCovered [Member] | Real Estate Other Class [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,569,237	4,384,309
Performing Financing Receivable [Member] | NonCovered [Member] | Residential Real Estate Construction Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	121,937	96,347
Performing Financing Receivable [Member] | NonCovered [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	205,940	209,229
Performing Financing Receivable [Member] | NonCovered [Member] | Collateralized Loan Obligations [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	390,787	433,737
Performing Financing Receivable [Member] | NonCovered [Member] | Unsecured Commercial Member [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	142,720	131,185
Performing Financing Receivable [Member] | NonCovered [Member] | Asset Based [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,715,618	1,790,277
Performing Financing Receivable [Member] | NonCovered [Member] | Cash Flow [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,778,012	2,443,887
Performing Financing Receivable [Member] | NonCovered [Member] | Equipment Finance Commercial Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	842,977	958,358
Performing Financing Receivable [Member] | NonCovered [Member] | SBA Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	39,260	44,054
Performing Financing Receivable [Member] | NonCovered [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	90,201	97,998
Performing Financing Receivable [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,551,095	5,302,948
Performing Financing Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	327,877	305,576
Performing Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,909,374	5,801,498
Collateralized Loan Obligations [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	394,388	439,187
Unsecured Commercial Member [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	143,314	131,824
Asset Based [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,719,777	1,794,851
Cash Flow [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,793,184	2,459,851
Equipment Finance Commercial Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	914,016	969,489
SBA Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	42,388	47,261
Residential Real Estate Construction Financing Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	122,316	96,728
Commercial Real Estate Construction Financing Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	206,393	210,407
Hospitality [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	612,089	560,219
SBA Loans [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	388,776	375,927
Real Estate Other Class [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 4,587,565	$ 4,404,414