Loans and Leases (Details 3) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Delinquent loans in loan portfolio
30-89 Days Past Due	$ 2,600	$ 8,700
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	22,100	18,800
Loans held for investment, net	12,452,205	11,882,432
NonCovered [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	5,886	19,406
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	22,121	18,818
Financing Receivable, Recorded Investment, Past Due	28,007	38,224
Current	12,230,909	11,553,417
Loans held for investment, net	12,258,916	11,591,641	$ 11,223,506
NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	5,077	11,628
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	15,937	11,987
Financing Receivable, Recorded Investment, Past Due	21,014	23,615
Current	5,484,073	5,316,945
Loans held for investment, net	5,505,087	5,340,560	5,398,244
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	715
Financing Receivable, Recorded Investment, Past Due	0	715
Current	372,480	306,420
Loans held for investment, net	372,480	307,135	283,067
NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	721	7,677
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,038	2,970
Financing Receivable, Recorded Investment, Past Due	3,759	10,647
Current	6,247,769	5,831,816
Loans held for investment, net	6,251,528	5,842,463	5,433,787
NonCovered [Member] | Consumer Portfolio Segment [Member]
Delinquent loans in loan portfolio
Loans held for investment, net	129,821	101,483	$ 108,408
Consumer Financing Receivable [Member] | NonCovered [Member] | Consumer Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	88	101
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,146	3,146
Financing Receivable, Recorded Investment, Past Due	3,234	3,247
Current	126,587	98,236
Loans held for investment, net		101,483
Collateralized Loan Obligations [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	425	878
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	140	965
Financing Receivable, Recorded Investment, Past Due	565	1,843
Current	358,524	437,344
Loans held for investment, net	359,089	439,187
Unsecured Commercial Member [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	57	69
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	45
Financing Receivable, Recorded Investment, Past Due	57	114
Current	126,514	131,710
Loans held for investment, net	126,571	131,824
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	2,022,429	1,794,851
Loans held for investment, net	2,022,429	1,794,851
Cash Flow [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	232
Financing Receivable, Recorded Investment, Past Due	0	232
Current	2,800,554	2,459,619
Loans held for investment, net	2,800,554	2,459,851
Equipment Finance Commercial Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	0	6,525
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,680	366
Financing Receivable, Recorded Investment, Past Due	1,680	6,891
Current	893,097	962,598
Loans held for investment, net	894,777	969,489
SBA Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	239	205
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,218	1,362
Financing Receivable, Recorded Investment, Past Due	1,457	1,567
Current	46,651	45,694
Loans held for investment, net	48,108	47,261
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	145,241	96,728
Loans held for investment, net	145,241	96,728
Commercial Real Estate Construction Loan 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	715
Financing Receivable, Recorded Investment, Past Due	0	715
Current	227,239	209,692
Loans held for investment, net	227,239	210,407
Hospitality [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	779	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Past Due	779	0
Current	623,368	560,219
Loans held for investment, net	624,147	560,219
SBA Loans [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	276	5,530
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	8,661	4,357
Financing Receivable, Recorded Investment, Past Due	8,937	9,887
Current	389,789	366,040
Loans held for investment, net	398,726	375,927
Real Estate Other Class [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	4,022	6,098
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	7,276	7,630
Financing Receivable, Recorded Investment, Past Due	11,298	13,728
Current	4,470,916	4,390,686
Loans held for investment, net	$ 4,482,214	$ 4,404,414