Loans and Leases (Details 8) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Purchased Credit Impaired Loans Composition [Line Items]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 96,900	$ 129,000
Loans held for investment, net	15,455,954,000	14,478,254,000
Loans and Leases Receivable, Allowance	(157,238,000)	(115,111,000)
Purchased Credit Impaired Loans and Leases [Member]
Purchased Credit Impaired Loans Composition [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	134,273,000	240,664,000
Loan Discounts	(25,849,000)	(51,619,000)
Loans held for investment, net	108,424,000	189,045,000
Loans and Leases Receivable, Allowance	(13,483,000)	(9,577,000)
Loans and Leases Receivable, Net Reported Amount, Covered	94,941,000	179,468,000
Mortgages [Member] | Purchased Credit Impaired Loans and Leases [Member]
Purchased Credit Impaired Loans Composition [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	112,982,000	207,170,000
Real Estate Construction [Member] | Purchased Credit Impaired Loans and Leases [Member]
Purchased Credit Impaired Loans Composition [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	1,901,000	2,534,000
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans and Leases [Member]
Purchased Credit Impaired Loans Composition [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	19,109,000	30,658,000
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans and Leases [Member]
Purchased Credit Impaired Loans Composition [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$ 281,000	$ 302,000