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Loans and Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment $ 15,756,285   $ 15,520,537      
Deferred fees, net (65,768)   (64,583)      
Loans held for investment, net 15,690,517   15,455,954      
Allowance for loan and lease losses (159,606)   (157,238)      
Total loans and leases held for investment, net 15,530,911   15,298,716      
Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 15,693,776   15,412,092      
Deferred fees, net (65,753)   (64,562)      
Loans held for investment, net 15,628,023   15,347,530 $ 14,622,647    
Allowance for loan and lease losses (152,770) $ (138,879) (143,755) (136,747) $ (132,000) $ (105,534)
Total loans and leases held for investment, net 15,475,253   15,203,775      
Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 62,509   108,445      
Deferred fees, net (15)   (21)      
Loans held for investment, net 62,494   108,424 120,199    
Allowance for loan and lease losses (6,836)   (13,483)      
Total loans and leases held for investment, net 55,658   94,941      
NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Total loans and leases held for investment, net     15,298,716      
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 6,146,978   5,635,675      
Loans held for investment, net 6,131,196   5,617,956 5,464,941    
Allowance for loan and lease losses (36,441) (37,122) (37,765) (36,941) (29,331) (36,654)
Real Estate Mortgage | Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 58,077   92,793      
Real Estate Mortgage | NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 6,205,055   5,728,468      
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 1,266,791   975,032      
Loans held for investment, net 1,249,222   962,839 831,515    
Allowance for loan and lease losses (11,693) (11,318) (10,045) (8,683) (7,853) (7,137)
Real Estate Construction and Land | Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 0   2,409      
Real Estate Construction and Land | NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 1,266,791   977,441      
Commercial | Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 7,894,115   8,426,236      
Loans held for investment, net 7,861,692   8,391,560 8,069,687    
Allowance for loan and lease losses (102,193) (88,364) (93,853) (89,591) (93,404) (61,082)
Commercial | Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 4,194   12,994      
Commercial | NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 7,898,309   8,439,230      
Consumer | Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 385,892   375,149      
Loans held for investment, net 385,913   375,175 256,504    
Allowance for loan and lease losses (2,443) $ (2,075) (2,092) $ (1,532) $ (1,412) $ (661)
Consumer | Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 238   249      
Consumer | NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment $ 386,130   $ 375,398