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Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 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 $ 1,044,148 $ 1,199,358        
Carrying Value of Acquired Impaired Loans [Roll Forward]            
Beginning balance 762,998 809,169        
Fair value of acquired loans         $ 15,555 $ 199,682
Accretion 32,188 39,798        
Payments received and other changes, net (136,472) (153,786)        
Ending balance 674,269 $ 894,863        
Loans on the Cost Recovery Method            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans on cost recovery method 2,057     $ 1,100    
Commercial            
Carrying Value of Acquired Impaired Loans [Roll Forward]            
Ending balance 336,109          
Noncommercial            
Carrying Value of Acquired Impaired Loans [Roll Forward]            
Ending balance 338,160          
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          
Ending balance 674,269          
Nonaccruing $ 1,600     $ 600