Loans and Leases (Details 1) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Delinquent loans in loan portfolio
30-89 Days Past Due	$ 3,600	$ 8,700
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	16,800
Non Purchased Credit Impaired Loans and Leases [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	10,622	19,406
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	17,508	18,818
Financing Receivable, Recorded Investment, Past Due	28,130	38,224
Current	14,261,079	11,553,417
Loans held for investment, net	14,289,209	11,591,641
Non Purchased Credit Impaired Loans and Leases [Member] | Mortgages [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	7,338	11,628
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	13,980	11,987
Financing Receivable, Recorded Investment, Past Due	21,318	23,615
Current	5,666,745	5,313,315
Loans held for investment, net	5,688,063	5,336,930
Non Purchased Credit Impaired Loans and Leases [Member] | Mortgages [Member] | Commercial Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	3,947	9,014
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	13,075	10,856
Financing Receivable, Recorded Investment, Past Due	17,022	19,870
Current	4,534,936	4,410,016
Loans held for investment, net	4,551,958	4,429,886
Non Purchased Credit Impaired Loans and Leases [Member] | Mortgages [Member] | Residential Real Estate [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	3,391	2,614
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	905	1,131
Financing Receivable, Recorded Investment, Past Due	4,296	3,745
Current	1,131,809	903,299
Loans held for investment, net	1,136,105	907,044
Non Purchased Credit Impaired Loans and Leases [Member] | Real Estate Construction [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	0	0
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	715
Financing Receivable, Recorded Investment, Past Due	0	715
Current	527,720	310,050
Loans held for investment, net	527,720	310,765
Non Purchased Credit Impaired Loans and Leases [Member] | Real Estate Construction [Member] | Commercial Real Estate Construction Loan Receivable [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	0	0
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	715
Financing Receivable, Recorded Investment, Past Due	0	715
Current	343,360	213,322
Loans held for investment, net	343,360	214,037
Non Purchased Credit Impaired Loans and Leases [Member] | Real Estate Construction [Member] | Residential Real Estate Construction Financing Receivable [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	0	0
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Past Due	0	0
Current	184,360	96,728
Loans held for investment, net	184,360	96,728
Non Purchased Credit Impaired Loans and Leases [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	2,658	7,677
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	2,221	2,970
Financing Receivable, Recorded Investment, Past Due	4,879	10,647
Current	7,947,698	5,831,816
Loans held for investment, net	7,952,577	5,842,463
Non Purchased Credit Impaired Loans and Leases [Member] | Consumer Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	626	101
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,307	3,146
Financing Receivable, Recorded Investment, Past Due	1,933	3,247
Current	118,916	98,236
Loans held for investment, net	120,849	101,483
Non Purchased Credit Impaired Loans and Leases [Member] | Cash Flow [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	2,048	274
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,427	1,639
Financing Receivable, Recorded Investment, Past Due	3,475	1,913
Current	3,058,793	2,637,023
Loans held for investment, net	3,062,268	2,638,936
Non Purchased Credit Impaired Loans and Leases [Member] | Asset Based [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	1	878
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	965
Financing Receivable, Recorded Investment, Past Due	1	1,843
Current	2,547,532	2,232,195
Loans held for investment, net	2,547,533	2,234,038
Non Purchased Credit Impaired Loans and Leases [Member] | Equipment Finance Commercial Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	359	6,525
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	94	366
Financing Receivable, Recorded Investment, Past Due	453	6,891
Current	889,896	962,598
Loans held for investment, net	890,349	969,489
Non Purchased Credit Impaired Loans and Leases [Member] | Venture Capital Loans [Member] | Commercial Portfolio Segment [Member]
Delinquent loans in loan portfolio
30-89 Days Past Due	250	0
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	700	0
Financing Receivable, Recorded Investment, Past Due	950	0
Current	1,451,477	0
Loans held for investment, net	$ 1,452,427	$ 0