Loans and Leases (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2012		Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Gross							$ 11,904,684	$ 4,313,335
Loans held for investment, net							11,882,432	4,312,352
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Gross							101,707	55,070
Loans held for investment, net							101,483
Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Gross							5,607,316	2,795,998
Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Gross							316,086	219,517
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Gross							5,879,575	1,242,750
NonCovered [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance							10,774	7,600
Impaired Financing Receivable Performing Restructured Loans							35,244	41,648
Impaired Financing Receivable, Recorded Investment							118,865	88,422
Financing Receivable, Recorded Investment, Nonaccrual Status							83,621
Impaired Financing Receivable, Unpaid Principal Balance							150,620	113,813
Financing Receivable, Individually Evaluated for Impairment							10,774	7,600
Loans and Leases Receivable, Gross							11,613,832	3,930,539
Impaired Financing Receivable, Average Recorded Investment	86,781	[1]	73,711	[1]	129,832	[1]
Impaired Financing Receivable, Interest Income, Accrual Method	1,471		1,976		4,724
Financing Receivable, Individually Evaluated for Impairment							118,865	88,422
Loans held for investment, net							11,591,641	3,929,556	[2]
NonCovered [Member] | Hospitality [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							1,946	5,717
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							1,945	6,215
Impaired Financing Receivable, Related Allowance							47	198
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							6,366	3,013
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							7,593	3,385
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,946	[1]	5,717	[1]	8,954	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	67		81		80
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,366	[1]	3,013	[1]	0	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
NonCovered [Member] | SBA Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							0	1,642
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							0	1,643
Impaired Financing Receivable, Related Allowance							0	230
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							11,141	2,602
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							14,708	3,646
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	[1]	1,642	[1]	827	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		90		41
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,610	[1]	2,601	[1]	1,472	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	77		0		0
NonCovered [Member] | Real Estate Mortgage Other Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							9,136	15,937
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							9,233	16,571
Impaired Financing Receivable, Related Allowance							646	1,760
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							29,268	33,365
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							40,643	46,062
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	9,136	[1]	13,205	[1]	51,441	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	409		509		2,070
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	21,652	[1]	27,912	[1]	29,316	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	315		1,060		1,523
NonCovered [Member] | Residential Real Estate Construction Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							763	778
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							763	778
Impaired Financing Receivable, Related Allowance							46	168
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							21	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							19	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	763	[1]	778	[1]	1,303	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	15		14		11
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4	[1]	0	[1]	0	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
NonCovered [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							1,128	1,250
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							4,934	1,250
Impaired Financing Receivable, Related Allowance							23	1
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							8,643	5,484
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							8,749	9,923
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,027	[1]	1,250	[1]	6,723	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	17		63		231
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	8,642	[1]	4,866	[1]	17,424	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	244		11		589
NonCovered [Member] | Collateralized Loan Obligations [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							4,630	4,377
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							5,246	4,692
Impaired Financing Receivable, Related Allowance							3,771	4,270
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							5,566	6,700
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							6,877	9,924
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	4,077	[1]	3,281	[1]	2,219	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	27		29		48
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,869	[1]	3,410	[1]	1,657	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	170		20		27
NonCovered [Member] | Unsecured Commercial Member [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							912	801
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							924	829
Impaired Financing Receivable, Related Allowance							799	375
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							725	179
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							809	247
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	661	[1]	772	[1]	2,273	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	21		33		20
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	126	[1]	157	[1]	148	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1		0		0
NonCovered [Member] | Asset Based [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							137	1,070
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							247	1,070
Impaired Financing Receivable, Related Allowance							137	180
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							4,436	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							5,415	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	137	[1]	569	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,270	[1]	0	[1]	132	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
NonCovered [Member] | Cash Flow [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							15,578	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							17,970	0
Impaired Financing Receivable, Related Allowance							2,667	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							387	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							919	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,837	[1]	0	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1	[1]	0	[1]	0	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
NonCovered [Member] | Equipment Finance Commercial Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							6,956	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							7,268	0
Impaired Financing Receivable, Related Allowance							2,601	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							4,175	632
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							7,528	632
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,802	[1]	0	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,534	[1]	245	[1]	224	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
NonCovered [Member] | SBA Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							0	1,136
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							0	1,136
Impaired Financing Receivable, Related Allowance							0	178
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							3,207	3,037
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							4,920	4,945
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	[1]	1,136	[1]	2,593	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		56		53
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,162	[1]	2,571	[1]	2,601	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	98		0		24
NonCovered [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment							143	424
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance							142	471
Impaired Financing Receivable, Related Allowance							37	240
Impaired Financing Receivable, with No Related Allowance, Recorded Investment							3,601	278
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance							3,768	394
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	132	[1]	425	[1]	389	[1]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	8		10		7
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,027	[1]	161	[1]	136	[1]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	2		0		0
Impaired Financing Receivable Performing Restructured Loans							259	308
Impaired Financing Receivable, Recorded Investment							3,744	702
Financing Receivable, Recorded Investment, Nonaccrual Status								394
Impaired Financing Receivable, Unpaid Principal Balance							3,910	865
Financing Receivable, Individually Evaluated for Impairment							37	240
Loans and Leases Receivable, Gross							101,423	54,809
Impaired Financing Receivable, Average Recorded Investment	3,159	[1]	586	[1]	525	[1]
Impaired Financing Receivable, Interest Income, Accrual Method	10		10		7
Financing Receivable, Individually Evaluated for Impairment							3,744	702
Loans held for investment, net								54,885	[2]
NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance								2,188
Impaired Financing Receivable Performing Restructured Loans							20,245	34,303
Impaired Financing Receivable, Recorded Investment							57,857	62,276
Financing Receivable, Recorded Investment, Nonaccrual Status								27,973
Impaired Financing Receivable, Unpaid Principal Balance							74,122	77,522
Financing Receivable, Individually Evaluated for Impairment							693	2,188
Loans and Leases Receivable, Gross							5,350,827	2,424,864
Impaired Financing Receivable, Average Recorded Investment	45,710	[1]	54,090	[1]	92,010	[1]
Impaired Financing Receivable, Interest Income, Accrual Method	868		1,740		3,714
Financing Receivable, Individually Evaluated for Impairment							57,857	62,276
Loans held for investment, net							5,340,560	2,422,107	[2]
NonCovered [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance								169
Impaired Financing Receivable Performing Restructured Loans							8,996	4,293
Impaired Financing Receivable, Recorded Investment							10,555	7,512
Financing Receivable, Recorded Investment, Nonaccrual Status								3,219
Impaired Financing Receivable, Unpaid Principal Balance							14,465	11,951
Financing Receivable, Individually Evaluated for Impairment							69	169
Loans and Leases Receivable, Gross							309,162	209,090
Impaired Financing Receivable, Average Recorded Investment	10,436	[1]	6,894	[1]	25,450	[1]
Impaired Financing Receivable, Interest Income, Accrual Method	276		88		831
Financing Receivable, Individually Evaluated for Impairment							10,555	7,512
Loans held for investment, net							307,135	207,779	[2]
NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance								5,003
Impaired Financing Receivable Performing Restructured Loans							5,744	2,744
Impaired Financing Receivable, Recorded Investment							46,709	17,932
Financing Receivable, Recorded Investment, Nonaccrual Status								15,188
Impaired Financing Receivable, Unpaid Principal Balance							58,123	23,475
Financing Receivable, Individually Evaluated for Impairment							9,975	5,003
Loans and Leases Receivable, Gross							5,852,420	1,241,776
Impaired Financing Receivable, Average Recorded Investment	27,476	[1]	12,141	[1]	11,847	[1]
Impaired Financing Receivable, Interest Income, Accrual Method	317		138		172
Financing Receivable, Individually Evaluated for Impairment							46,709	17,932
Loans held for investment, net							5,842,463	1,244,785	[2]
Nonperforming Financing Receivable [Member] | NonCovered [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Gross								46,774
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Hospitality [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							6,366	6,723
Nonperforming Financing Receivable [Member] | NonCovered [Member] | SBA Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							11,141	2,602
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Residential Real Estate Construction Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							381	389
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Collateralized Loan Obligations [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							5,450	9,991
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Unsecured Commercial Member [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							639	458
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Asset Based [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							4,574	1,070
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Cash Flow [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							15,964	0
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Equipment Finance Commercial Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							11,131	632
Nonperforming Financing Receivable [Member] | NonCovered [Member] | SBA Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							3,207	3,037
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							3,485	394
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							37,612	27,973
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							1,559	3,219
Nonperforming Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net							$ 40,965	$ 15,188

[1] (1)For the loans and leases (excluding PCI loans) reported as impaired at December 31, 2014, 2013 and 2012, amounts were calculated based on the period of time such loans and leases were impaired during the reported period.

[2] (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.