Loans and Leases (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Allowance	$ 115,111	$ 84,455
Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Allowance	9,577	13,999
Loans and Leases Receivable, Allowance, Covered	9,577	13,999	$ 21,793
Allowance for Loan and Lease Losses, Write-offs	(1,772)	(9,577)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	150	766
Provision for Loan and Lease Losses	(2,800)	(1,017)
Receivables Acquired With Deteriorated Credit Quality, Allowance For Credit Losses	9,577	13,999
Loans held for investment, net	189,045	290,791
Receivables Acquired with Deteriorated Credit Quality	189,045	290,791
NonPCI and PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Allowance	115,111	84,455
Loans and Leases Receivable Allowance Covered And Noncovered	115,111	84,455	82,034
Allowance for Loan and Lease Losses, Write-offs	(17,771)	(21,452)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	8,623	11,110
Provision for Loan and Lease Losses	(39,804)	(12,763)
Loans held for investment, net	14,478,254	11,882,432
Loans and Leases Receivable Net Of Deferred Income Covered And Noncovered	14,478,254	11,882,432
Non Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Allowance	105,534	70,456	60,241
Allowance for Loan and Lease Losses, Write-offs	(15,999)	(11,875)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	8,473	10,344
Provision for Loan and Lease Losses	(42,604)	(11,746)
Financing Receivable, Individually Evaluated for Impairment	19,263	10,774
Financing Receivable, Collectively Evaluated for Impairment	86,271	59,682
Loans held for investment, net	14,289,209	11,591,641
Financing Receivable, Individually Evaluated for Impairment	168,299	114,923
Financing Receivable, Collectively Evaluated for Impairment	14,120,910	11,476,718
Consumer Portfolio Segment [Member] | Non Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Allowance	661	1,253	2,944
Allowance for Loan and Lease Losses, Write-offs	(156)	(332)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	410	1,283
Provision for Loan and Lease Losses	(846)	(2,642)
Financing Receivable, Individually Evaluated for Impairment	157	37
Financing Receivable, Collectively Evaluated for Impairment	504	1,216
Loans held for investment, net	120,849	101,483
Financing Receivable, Individually Evaluated for Impairment	1,672	3,510
Financing Receivable, Collectively Evaluated for Impairment	119,177	97,973
Commercial Portfolio Segment [Member] | Non Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Allowance	61,082	39,858	26,921
Allowance for Loan and Lease Losses, Write-offs	(13,354)	(9,463)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	3,399	6,265
Provision for Loan and Lease Losses	(31,179)	(16,135)
Financing Receivable, Individually Evaluated for Impairment	17,622	9,975
Financing Receivable, Collectively Evaluated for Impairment	43,460	29,883
Loans held for investment, net	7,952,577	5,842,463
Financing Receivable, Individually Evaluated for Impairment	74,680	45,568
Financing Receivable, Collectively Evaluated for Impairment	7,877,897	5,796,895
Real Estate Construction [Member] | Non Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Allowance	7,137	4,248	4,298
Allowance for Loan and Lease Losses, Write-offs	0	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	1,082	156
Provision for Loan and Lease Losses	(1,807)	(206)
Financing Receivable, Individually Evaluated for Impairment	26	69
Financing Receivable, Collectively Evaluated for Impairment	7,111	4,179
Loans held for investment, net	527,720	310,765
Financing Receivable, Individually Evaluated for Impairment	8,003	10,555
Financing Receivable, Collectively Evaluated for Impairment	519,717	296,580
Mortgages [Member] | Non Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Allowance	36,654	25,097	$ 26,078
Allowance for Loan and Lease Losses, Write-offs	(2,489)	(2,080)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	3,582	2,640
Provision for Loan and Lease Losses	(10,464)	(1,541)
Financing Receivable, Individually Evaluated for Impairment	1,458	693
Financing Receivable, Collectively Evaluated for Impairment	35,196	24,404
Loans held for investment, net	5,688,063	5,336,930
Financing Receivable, Individually Evaluated for Impairment	83,944	55,290
Financing Receivable, Collectively Evaluated for Impairment	$ 5,604,119	$ 5,285,270