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Operations and Summary of Significant Accounting Policies - Impact of ASU 2016-13 (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Assets              
Loans held for investment (outstanding balance) $ 25,609,885     $ 24,736,642      
Allowance for credit losses on loans (264,722)   $ (195,047) (195,047) $ (214,572)   $ (191,522)
Loans held for investment, net 25,260,107   24,451,215 24,451,215      
Net deferred tax asset     21,064        
Liabilities:              
Allowance for credit losses on off-balance sheet exposures 12,268 $ 10,174 8,640 8,640 10,790 $ 9,795 11,434
Equity:              
Retained earnings 1,600,639 $ 1,637,392 1,663,671 1,663,671 1,516,044 $ 1,440,669 1,361,406
Cumulative Effect, Period Of Adoption, Adjusted Balance              
Assets              
Allowance for credit losses on loans     (203,632)        
Loans held for investment, net     24,442,630        
Net deferred tax asset     23,058        
Liabilities:              
Allowance for credit losses on off-balance sheet exposures     9,203        
Equity:              
Retained earnings     1,656,517        
Cumulative Effect, Period Of Adoption, Adjustment              
Assets              
Allowance for credit losses on loans     (8,585) (8,585)      
Loans held for investment, net     (8,585)        
Net deferred tax asset     1,994        
Liabilities:              
Allowance for credit losses on off-balance sheet exposures     563        
Equity:              
Retained earnings     (7,154)        
Commercial              
Assets              
Loans held for investment (outstanding balance) 9,164,661   10,230,828 9,133,444      
Allowance for credit losses on loans (83,194)     (102,254) (109,549)   (96,814)
Commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance              
Assets              
Loans held for investment (outstanding balance)     9,133,444        
Commercial | Cumulative Effect, Period Of Adoption, Adjustment              
Assets              
Loans held for investment (outstanding balance)     (1,097,384)        
Allowance for credit losses on loans       15,740      
Energy              
Assets              
Loans held for investment (outstanding balance) 1,146,164   1,425,309      
Allowance for credit losses on loans (102,695)     (60,253) (48,139)   (34,882)
Energy | Cumulative Effect, Period Of Adoption, Adjusted Balance              
Assets              
Loans held for investment (outstanding balance)     1,425,309        
Energy | Cumulative Effect, Period Of Adoption, Adjustment              
Assets              
Loans held for investment (outstanding balance)     1,425,309        
Allowance for credit losses on loans       (24,154)      
Mortgage finance              
Assets              
Loans held for investment (outstanding balance) 8,972,626   8,169,849 8,169,849      
Allowance for credit losses on loans (4,595)     (2,265) (2,316)   0
Mortgage finance | Cumulative Effect, Period Of Adoption, Adjusted Balance              
Assets              
Loans held for investment (outstanding balance)     8,169,849        
Mortgage finance | Cumulative Effect, Period Of Adoption, Adjustment              
Assets              
Loans held for investment (outstanding balance)     0        
Allowance for credit losses on loans       (2,031)      
Construction              
Assets              
Loans held for investment (outstanding balance)     2,563,339        
Construction | Cumulative Effect, Period Of Adoption, Adjusted Balance              
Assets              
Loans held for investment (outstanding balance)            
Construction | Cumulative Effect, Period Of Adoption, Adjustment              
Assets              
Loans held for investment (outstanding balance)     (2,563,339)        
Real Estate              
Assets              
Loans held for investment (outstanding balance) 6,326,434   3,444,701 6,008,040      
Allowance for credit losses on loans $ (74,238)     (30,275) $ (54,568)   $ (52,595)
Real Estate | Cumulative Effect, Period Of Adoption, Adjusted Balance              
Assets              
Loans held for investment (outstanding balance)     6,008,040        
Real Estate | Cumulative Effect, Period Of Adoption, Adjustment              
Assets              
Loans held for investment (outstanding balance)     2,563,339        
Allowance for credit losses on loans       $ 1,860      
Consumer              
Assets              
Loans held for investment (outstanding balance)     71,463        
Consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance              
Assets              
Loans held for investment (outstanding balance)            
Consumer | Cumulative Effect, Period Of Adoption, Adjustment              
Assets              
Loans held for investment (outstanding balance)     (71,463)        
Equipment leases              
Assets              
Loans held for investment (outstanding balance)     256,462        
Equipment leases | Cumulative Effect, Period Of Adoption, Adjusted Balance              
Assets              
Loans held for investment (outstanding balance)            
Equipment leases | Cumulative Effect, Period Of Adoption, Adjustment              
Assets              
Loans held for investment (outstanding balance)     $ (256,462)