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Loans and Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross $ 15,520,537 $ 14,528,165  
Loans and Leases Receivable, Deferred Income (64,583) (49,911)  
Loans held for investment, net 15,455,954 14,478,254  
Loans and Leases Receivable, Allowance (157,238) (115,111)  
Loans and leases, net 15,298,716 14,363,143  
Non Purchased Credit Impaired Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 15,412,092 14,339,070  
Loans and Leases Receivable, Deferred Income (64,562) (49,861)  
Loans held for investment, net 15,347,530 14,289,209  
Loans and Leases Receivable, Allowance (143,755) (105,534) $ (70,456)
Loans and leases, net 15,203,775 14,183,675  
Purchased Credit Impaired Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 108,445 189,095  
Loans and Leases Receivable, Deferred Income (21) (50)  
Loans held for investment, net 108,424 189,045  
Loans and Leases Receivable, Allowance (13,483) (9,577)  
Loans and leases, net 94,941 179,468  
NonPCI and PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Deferred Income   (64,583)  
Loans and leases, net   14,363,143  
Mortgages [Member] | Non Purchased Credit Impaired Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 5,635,675 5,706,903  
Loans held for investment, net 5,617,956 5,688,063  
Loans and Leases Receivable, Allowance (37,765) (36,654) (25,097)
Mortgages [Member] | Purchased Credit Impaired Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 92,793 168,725  
Mortgages [Member] | NonPCI and PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 5,728,468 5,875,628  
Real Estate Construction [Member] | Non Purchased Credit Impaired Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 975,032 534,307  
Loans held for investment, net 962,839 527,720  
Loans and Leases Receivable, Allowance (10,045) (7,137) (4,248)
Real Estate Construction [Member] | Purchased Credit Impaired Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 2,409 2,656  
Real Estate Construction [Member] | NonPCI and PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 977,441 536,963  
Commercial Portfolio Segment [Member] | Non Purchased Credit Impaired Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 8,426,236 7,977,067  
Loans held for investment, net 8,391,560 7,952,577  
Loans and Leases Receivable, Allowance (93,853) (61,082) (39,858)
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 12,994 17,415  
Commercial Portfolio Segment [Member] | NonPCI and PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 8,439,230 7,994,482  
Consumer Portfolio Segment [Member] | Non Purchased Credit Impaired Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 375,149 120,793  
Loans held for investment, net 375,175 120,849  
Loans and Leases Receivable, Allowance (2,092) (661) $ (1,253)
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 249 299  
Consumer Portfolio Segment [Member] | NonPCI and PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross $ 375,398 $ 121,092