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Loans and Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment $ 17,295,589   $ 17,032,221      
Deferred fees, net (65,443)   (59,478)      
Loans held for investment, net 17,230,146   16,972,743      
Allowance for loan and lease losses (141,920) $ (132,139) (139,456)      
Total loans and leases held for investment, net 17,088,226   16,833,287      
NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Total loans and leases held for investment, net     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] $ 15,628,023    
Allowance for loan and lease losses (152,770)   (133,012) (152,770) $ (138,879) $ (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 62,494    
Allowance for loan and lease losses     (6,444)      
Total loans and leases held for investment, net     51,592      
Real Estate Mortgage            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 7,695,182          
Loans held for investment, net 7,678,660          
Allowance for loan and lease losses (46,357) (45,467) (40,051)      
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 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 [2],[3] 6,131,196    
Allowance for loan and lease losses (36,441)     (36,441) (37,122) (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 Construction and Land            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 2,026,645          
Loans held for investment, net 2,000,957          
Allowance for loan and lease losses (26,186) (26,210) (13,055)      
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      
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 [2],[3] 1,249,222    
Allowance for loan and lease losses (11,693)     (11,693) (11,318) (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      
Commercial            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 7,175,310          
Loans held for investment, net 7,152,058          
Allowance for loan and lease losses (67,644) (58,806) (84,022)      
Commercial | NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment     7,142,136      
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 [2],[3] 7,861,692    
Allowance for loan and lease losses (102,193)     (102,193) (88,364) (93,853)
Commercial | Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment     4,158      
Consumer            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment 398,452          
Loans held for investment, net 398,471          
Allowance for loan and lease losses (1,733) $ (1,656) (2,328)      
Consumer | NonPCI and PCI Loans            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment     409,785      
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 [2],[3] 385,913    
Allowance for loan and lease losses $ (2,443)     $ (2,443) $ (2,075) $ (2,092)
Consumer | Purchased Credit Impaired Loans and Leases            
Financing Receivable, Recorded Investment [Line Items]            
Gross loans and leases held for investment     $ 234      
[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.