Loans and Leases (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Delinquent loans in loan portfolio
30-89 Days Past Due	$ 8,700	$ 4,200
Loans held for investment, net	11,882,432	4,312,352
Consumer Portfolio Segment [Member]
Delinquent loans in loan portfolio
Loans held for investment, net	101,483
NonCovered [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	19,406	23,897
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	18,818	5,233
Financing Receivable, Recorded Investment, Past Due	38,224	29,130
Current	11,553,417	3,900,426
Loans held for investment, net	11,591,641	3,929,556	[1]
NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	11,628	15,590
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	11,987	2,406
Financing Receivable, Recorded Investment, Past Due	23,615	17,996
Current	5,316,945	2,404,111
Loans held for investment, net	5,340,560	2,422,107	[1]
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	715	2,013
Financing Receivable, Recorded Investment, Past Due	715	2,013
Current	306,420	205,766
Loans held for investment, net	307,135	207,779	[1]
NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	7,677	4,988
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	2,970	814
Financing Receivable, Recorded Investment, Past Due	10,647	5,802
Current	5,831,816	1,238,983
Loans held for investment, net	5,842,463	1,244,785	[1]
NonCovered [Member] | Consumer Portfolio Segment [Member]
Delinquent loans in loan portfolio
Loans held for investment, net		54,885	[1]
Consumer Financing Receivable [Member] | NonCovered [Member] | Consumer Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	101	3,319
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,146	0
Financing Receivable, Recorded Investment, Past Due	3,247	3,319
Current	98,236	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	878	473
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	965	259
Financing Receivable, Recorded Investment, Past Due	1,843	732
Current	437,344	585,749
Loans held for investment, net	439,187	586,481
Unsecured Commercial Member [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	69	83
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	45	68
Financing Receivable, Recorded Investment, Past Due	114	151
Current	131,710	153,601
Loans held for investment, net	131,824	153,752
Asset Based [Member] | NonCovered [Member] | Commercial Portfolio Segment [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	1,794,851	202,428
Loans held for investment, net	1,794,851	202,428
Cash Flow [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	232
Financing Receivable, Recorded Investment, Past Due	232
Current	2,459,619
Loans held for investment, net	2,459,851	0
Equipment Finance Commercial Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	6,525	2,662
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	366	244
Financing Receivable, Recorded Investment, Past Due	6,891	2,906
Current	962,598	270,577
Loans held for investment, net	969,489	273,483
SBA Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	205	1,770
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,362	243
Financing Receivable, Recorded Investment, Past Due	1,567	2,013
Current	45,694	26,628
Loans held for investment, net	47,261	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	0	0
Financing Receivable, Recorded Investment, Past Due	0	0
Current	96,728	58,881
Loans held for investment, net	96,728	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	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	715	2,013
Financing Receivable, Recorded Investment, Past Due	715	2,013
Current	209,692	146,885
Loans held for investment, net	210,407	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	560,219	180,553
Loans held for investment, net	560,219	180,553
SBA Loans [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	5,530	2,564
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,357	0
Financing Receivable, Recorded Investment, Past Due	9,887	2,564
Current	366,040	42,602
Loans held for investment, net	375,927	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	6,098	13,026
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	7,630	2,406
Financing Receivable, Recorded Investment, Past Due	13,728	15,432
Current	4,390,686	2,180,956
Loans held for investment, net	$ 4,404,414	$ 2,196,388

[1] (1)As of December 31, 2013, the amounts of loans covered by loss sharing provisions of FDIC loss sharing agreements in the Non-PCI and PCI categories were $85.9 million and $362.5 million.