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Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
May 01, 2018
Dec. 31, 2017
Jan. 13, 2017
Mar. 11, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Impaired Financing Receivable, Unpaid Principal Balance $ 999,926 $ 1,293,760 $ 999,926 $ 1,293,760        
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Beginning balance     762,998 809,169        
Fair value of acquired loans             $ 15,555 $ 199,682
Accretion     45,699 59,039        
Payments received and other changes, net     (186,234) (233,723)        
Ending balance 638,018 834,167 638,018 834,167        
Loans on the Cost Recovery Method                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans on cost recovery method 3,719   3,719     $ 1,100    
Commercial                
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Beginning balance     393,419          
Ending balance 317,014   317,014          
Noncommercial                
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Ending balance 321,004   321,004          
Mortgage | Noncommercial                
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Beginning balance     369,579          
HomeBancorp Inc.                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair value of loans acquired         $ 550,618      
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Fair value of acquired loans         15,555      
HomeBancorp Inc. | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair value of loans acquired         252,327      
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Fair value of acquired loans         8,238      
HomeBancorp Inc. | Noncommercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair value of loans acquired         298,291      
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Fair value of acquired loans         7,317      
HomeBancorp Inc. | Construction and land development | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair value of loans acquired         525      
HomeBancorp Inc. | Mortgage | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair value of loans acquired         188,688      
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Fair value of acquired loans         7,815      
HomeBancorp Inc. | Mortgage | Noncommercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair value of loans acquired         296,273      
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Fair value of acquired loans         7,317      
HomeBancorp Inc. | Revolving mortgage | Noncommercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair value of loans acquired         51      
HomeBancorp Inc. | Other commercial real estate | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair value of loans acquired         55,183      
HomeBancorp Inc. | Commercial and industrial | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair value of loans acquired         7,931      
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Fair value of acquired loans         423      
HomeBancorp Inc. | Consumer | Noncommercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair value of loans acquired         $ 1,967      
PCI Loans                
Carrying Value of Acquired Impaired Loans [Roll Forward]                
Beginning balance     762,998          
Accretion Income 13,500 $ 19,200 45,700 $ 59,000        
Ending balance 638,018   638,018          
Nonaccruing $ 1,500   $ 1,500     $ 600