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Loans and Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment $ 16,516,627 $ 17,032,221    
Deferred fees, net (61,342) (59,478)    
Loans held for investment, net 16,455,285 16,972,743    
Allowance for loan and lease losses (134,275) (139,456)    
Total loans and leases held for investment, net 16,321,010 16,833,287    
Non Purchased Credit Impaired Loans and Leases        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   16,974,171    
Deferred fees, net   (59,464)    
Loans held for investment, net   16,914,707 [1],[2],[3] $ 15,460,354  
Allowance for loan and lease losses   (133,012) (149,826) $ (143,755)
Total loans and leases held for investment, net   16,781,695    
Purchased Credit Impaired Loans and Leases        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   58,050    
Deferred fees, net   (14)    
Loans held for investment, net   58,036 96,335  
Allowance for loan and lease losses   (6,444)    
Total loans and leases held for investment, net   51,592    
NonPCI and PCI Loans        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases held for investment, net   16,833,287    
Real Estate Mortgage        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment 7,570,526      
Loans held for investment, net 7,554,243      
Allowance for loan and lease losses (40,158) (40,051)    
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   7,815,355    
Loans held for investment, net   7,798,991 [1],[2] 5,886,969  
Allowance for loan and lease losses     (35,368) (37,765)
Real Estate Mortgage | Purchased Credit Impaired Loans and Leases        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   53,658    
Real Estate Mortgage | NonPCI and PCI Loans        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   7,869,013    
Real Estate Construction and Land        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment 1,699,630      
Loans held for investment, net 1,677,002      
Allowance for loan and lease losses (18,190) (13,055)    
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   1,611,287    
Loans held for investment, net   1,591,229 [1],[2] 1,108,236  
Allowance for loan and lease losses     (10,476) (10,045)
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    
Real Estate Construction and Land | NonPCI and PCI Loans        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   1,611,287    
Commercial        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment 6,848,576      
Loans held for investment, net 6,826,123      
Allowance for loan and lease losses (73,780) (84,022)    
Commercial | Non Purchased Credit Impaired Loans and Leases        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   7,137,978    
Loans held for investment, net   7,114,920 [1],[2] 8,082,678  
Allowance for loan and lease losses     (102,134) (93,853)
Commercial | Purchased Credit Impaired Loans and Leases        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   4,158    
Commercial | NonPCI and PCI Loans        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   7,142,136    
Consumer        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment 397,895      
Loans held for investment, net 397,917      
Allowance for loan and lease losses $ (2,147) (2,328)    
Consumer | Non Purchased Credit Impaired Loans and Leases        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   409,551    
Loans held for investment, net   409,567 [1],[2] 382,471  
Allowance for loan and lease losses     $ (1,848) $ (2,092)
Consumer | Purchased Credit Impaired Loans and Leases        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   234    
Consumer | NonPCI and PCI Loans        
Financing Receivable, Recorded Investment [Line Items]        
Gross loans and leases held for investment   $ 409,785    
[1] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.
[2] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.
[3] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.