Loans and Credit Quality (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Delinquent loans in loan portfolio
30-89 Days Past Due	$ 7,400	$ 4,200
Loans held for investment, net	11,574,885	4,312,352	4,383,393
Consumer Portfolio Segment [Member]
Delinquent loans in loan portfolio
Loans held for investment, net	108,408
NonCovered [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	13,269	23,897
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	20,014	5,233
Financing Receivable, Recorded Investment, Past Due	33,283	29,130
Current	11,190,223	3,900,426
Loans held for investment, net	11,223,506	3,929,556	3,950,636
NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	10,454	15,590
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	13,644	2,406
Financing Receivable, Recorded Investment, Past Due	24,098	17,996
Current	5,374,146	2,404,111
Loans held for investment, net	5,398,244	2,422,107	2,548,932
NonCovered [Member] | Real Estate Construction [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	1,928	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	2,029	2,013
Financing Receivable, Recorded Investment, Past Due	3,957	2,013
Current	279,110	205,766
Loans held for investment, net	283,067	207,779	188,872
NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	719	4,988
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,097	814
Financing Receivable, Recorded Investment, Past Due	1,816	5,802
Current	5,431,971	1,238,983
Loans held for investment, net	5,433,787	1,244,785	1,178,923
NonCovered [Member] | Consumer Portfolio Segment [Member]
Delinquent loans in loan portfolio
Loans held for investment, net		54,885	33,909
Consumer Financing Receivable [Member] | NonCovered [Member] | Consumer Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	168	3,319
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,244	0
Financing Receivable, Recorded Investment, Past Due	3,412	3,319
Current	104,996	51,566
Loans held for investment, net		54,885
Collateralized Loan Obligations [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	56	473
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	940	259
Financing Receivable, Recorded Investment, Past Due	996	732
Current	427,581	585,749
Loans held for investment, net	428,577	586,481
Unsecured Commercial Member [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	38	83
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	25	68
Financing Receivable, Recorded Investment, Past Due	63	151
Current	126,976	153,601
Loans held for investment, net	127,039	153,752
Asset Based [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	271	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Past Due	271	0
Current	1,594,161	202,428
Loans held for investment, net	1,594,432	202,428
Cash Flow [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	235
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0
Financing Receivable, Recorded Investment, Past Due	235
Current	2,313,963
Loans held for investment, net	2,314,198	0
Equipment Finance Commercial Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	119	2,662
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	132	244
Financing Receivable, Recorded Investment, Past Due	251	2,906
Current	928,209	270,577
Loans held for investment, net	928,460	273,483
SBA Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	0	1,770
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	243
Financing Receivable, Recorded Investment, Past Due	0	2,013
Current	41,081	26,628
Loans held for investment, net	41,081	28,641
Residential Real Estate Construction Financing Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	542	0
Financing Receivable, Recorded Investment, Past Due	542	0
Current	72,344	58,881
Loans held for investment, net	72,886	58,881
Commercial Real Estate Construction Financing Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	1,928	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,487	2,013
Financing Receivable, Recorded Investment, Past Due	3,415	2,013
Current	206,766	146,885
Loans held for investment, net	210,181	148,898
Hospitality [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Past Due	0	0
Current	519,350	180,553
Loans held for investment, net	519,350	180,553
SBA Loans [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	2,304	2,564
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	516	0
Financing Receivable, Recorded Investment, Past Due	2,820	2,564
Current	348,948	42,602
Loans held for investment, net	351,768	45,166
Real Estate Other Class [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	8,150	13,026
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	13,128	2,406
Financing Receivable, Recorded Investment, Past Due	21,278	15,432
Current	4,505,848	2,180,956
Loans held for investment, net	$ 4,527,126	$ 2,196,388