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Loans and Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment $ 18,796,011   $ 18,026,365      
Deferred fees, net (60,468)   (68,652)      
Loans held for investment, net 18,735,543   17,957,713      
Allowance for loan and lease losses (138,552) $ (135,037) (132,472) $ (141,920) $ (132,139)  
Total loans and leases held for investment, net 18,596,991   17,825,241      
Non Purchased Credit Impaired Loans and Leases            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans held for investment, net 18,735,543   17,957,713 17,230,146    
Allowance for loan and lease losses (138,552) (135,037) (132,472) (141,920) (132,139) $ (139,456)
Real Estate Mortgage            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment 7,908,097          
Loans held for investment, net 7,896,924   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 7,896,924   7,918,141 7,678,660    
Allowance for loan and lease losses (45,146) (46,826) (46,021) (46,357) (45,467) (40,051)
Real Estate Construction and Land            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment 2,581,317          
Loans held for investment, net 2,551,474   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 2,551,474   2,233,656 2,000,957    
Allowance for loan and lease losses (27,061) (26,378) (28,209) (26,186) (26,210) (13,055)
Commercial            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment 7,898,042          
Loans held for investment, net 7,878,557   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 7,878,557   7,404,595 7,152,058    
Allowance for loan and lease losses (64,185) (59,401) (56,360) (67,644) (58,806) (84,022)
Consumer            
Financing Receivable, Credit Quality Indicator [Line Items]            
Gross loans and leases held for investment 408,555          
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 408,588   401,321 398,471    
Allowance for loan and lease losses $ (2,160) $ (2,432) $ (1,882) $ (1,733) $ (1,656) $ (2,328)