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Loans and Leases (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment $ 15,609,180   $ 15,520,537      
Deferred fees, net (65,723)   (64,583)      
Loans held for investment, net 15,543,457   15,455,954      
Allowance for loan and lease losses (145,958)   (157,238)      
Total loans and leases held for investment, net 15,397,499   15,298,716      
Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 15,536,735   15,412,092      
Deferred fees, net (65,704)   (64,562)      
Loans held for investment, net 15,471,031 [1],[2]   15,347,530 $ 14,504,580    
Allowance for loan and lease losses (138,879) $ (149,826) (143,755) (132,000) $ (120,807) $ (105,534)
Total loans and leases held for investment, net 15,332,152   15,203,775      
Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 72,445   108,445      
Deferred fees, net (19)   (21)      
Loans held for investment, net 72,426   108,424 136,880    
Allowance for loan and lease losses (7,079)   (13,483)      
Total loans and leases held for investment, net 65,347   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 6,089,209   5,635,675      
Loans held for investment, net 6,071,798 [1],[2]   5,617,956 5,563,380    
Allowance for loan and lease losses (37,122) (35,368) (37,765) (29,331) (29,099) (36,654)
Real Estate Mortgage | Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 65,950   92,793      
Real Estate Mortgage | NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 6,155,159   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 1,179,616   975,032      
Loans held for investment, net 1,163,340 [1],[2]   962,839 696,233    
Allowance for loan and lease losses (11,318) (10,476) (10,045) (7,853) (6,876) (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 1,774   2,409      
Real Estate Construction and Land | NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 1,181,390   977,441      
Commercial | Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 7,869,706   8,426,236      
Loans held for investment, net 7,837,667 [1],[2]   8,391,560 8,032,333    
Allowance for loan and lease losses (88,364) (102,134) (93,853) (93,404) (83,957) (61,082)
Commercial | Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 4,479   12,994      
Commercial | NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 7,874,185   8,439,230      
Consumer | Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 398,204   375,149      
Loans held for investment, net 398,226 [1]   375,175 212,634    
Allowance for loan and lease losses (2,075) $ (1,848) (2,092) $ (1,412) $ (875) $ (661)
Consumer | Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 242   249      
Consumer | NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment $ 398,446   $ 375,398      
[1] Excludes loans held for sale carried at lower of cost or fair value.
[2] Excludes loans held for sale carried at lower of cost or fair value.