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Loans and Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross $ 18,910,740 $ 18,026,365    
Loans and Leases Receivable, Deferred Income (63,868) (68,652)    
Loans held for investment, net 18,846,872 17,957,713    
Loans and Leases Receivable, Allowance (138,785) (132,472)    
Loans and leases, net 18,708,087 17,825,241    
Non Purchased Credit Impaired Loans and Leases        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans held for investment, net 18,846,872 17,957,713    
Loans and Leases Receivable, Allowance (138,785) (132,472) $ (132,472) $ (139,456) [1]
Mortgages [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross 7,982,383      
Loans held for investment, net 7,972,747 7,918,141    
Mortgages [Member] | Non Purchased Credit Impaired Loans and Leases        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans held for investment, net   7,918,141    
Loans and Leases Receivable, Allowance (44,575) (46,021) (46,021) (40,051)
Mortgages [Member] | NonPCI and PCI Loans [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross   7,933,859    
Real Estate Construction [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross 2,773,209      
Loans held for investment, net 2,737,802 2,233,656    
Real Estate Construction [Member] | Non Purchased Credit Impaired Loans and Leases        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans held for investment, net   2,233,656    
Loans and Leases Receivable, Allowance (30,544) (28,209) (28,209) (13,055)
Real Estate Construction [Member] | NonPCI and PCI Loans [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross   2,262,710    
Commercial Portfolio Segment [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross 7,714,358      
Loans held for investment, net 7,695,496 7,404,595    
Commercial Portfolio Segment [Member] | Non Purchased Credit Impaired Loans and Leases        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans held for investment, net   7,404,595    
Loans and Leases Receivable, Allowance (61,528) (56,360) (56,360) (84,022)
Commercial Portfolio Segment [Member] | NonPCI and PCI Loans [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross   7,428,500    
Consumer Portfolio Segment [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross 440,790      
Loans held for investment, net 440,827 401,321    
Consumer Portfolio Segment [Member] | Non Purchased Credit Impaired Loans and Leases        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans held for investment, net   401,321    
Loans and Leases Receivable, Allowance $ (2,138) (1,882) $ (1,882) $ (2,328)
Consumer Portfolio Segment [Member] | NonPCI and PCI Loans [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loans and Leases Receivable, Gross   $ 401,296    
[1]
The allowance for loan losses related to PCI loans of $6.4 million as of December 31, 2017 is reflected in the beginning balance of the allowance for loan and lease losses for the year ended December 31, 2018.