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Loans and Leases (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment $ 18,532,740   $ 18,026,365      
Deferred fees, net (59,888)   (68,652)      
Loans held for investment, net 18,472,852   17,957,713      
Allowance for loan and lease losses (135,037) $ (136,281) (132,472) $ (132,139) $ (134,275)  
Total loans and leases held for investment, net 18,337,815   17,825,241      
Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans held for investment, net 18,472,852   17,957,713 16,885,192    
Allowance for loan and lease losses (135,037) (136,281) (132,472) (132,139) (134,275) $ (139,456)
Real Estate Mortgage            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment 8,087,586          
Loans held for investment, net 8,076,026   7,918,141      
Real Estate Mortgage | NonPCI and PCI Loans            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment     7,933,859      
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans held for investment, net 8,076,026   7,918,141 7,566,374    
Allowance for loan and lease losses (46,826) (45,754) (46,021) (45,467) (40,158) (40,051)
Real Estate Construction and Land            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment 2,405,073          
Loans held for investment, net 2,376,130   2,233,656      
Real Estate Construction and Land | NonPCI and PCI Loans            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment     2,262,710      
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans held for investment, net 2,376,130   2,233,656 1,874,026    
Allowance for loan and lease losses (26,378) (27,208) (28,209) (26,210) (18,190) (13,055)
Commercial            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment 7,593,728          
Loans held for investment, net 7,574,314   7,404,595      
Commercial | NonPCI and PCI Loans            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment     7,428,500      
Commercial | Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans held for investment, net 7,574,314   7,404,595 7,066,112    
Allowance for loan and lease losses (59,401) (61,496) (56,360) (58,806) (73,780) (84,022)
Consumer            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment 446,353          
Loans held for investment, net     401,321      
Consumer | NonPCI and PCI Loans            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment     401,296      
Consumer | Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans held for investment, net 446,382   401,321 378,680    
Allowance for loan and lease losses $ (2,432) $ (1,823) $ (1,882) $ (1,656) $ (2,147) $ (2,328)