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Allowance For Loan Losses for PCI Loans, by Loan Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 25,770 $ 26,205 $ 26,482
Purchased impaired provision 8,659    
Benefit attributable to FDIC indemnification asset (451)    
Provision for loan losses charged to operations 8,208 5,678 9,047
Provision for loan losses recorded through the FDIC indemnification asset 8,208 5,678 9,047
Ending balance 24,077 25,770 26,205
Purchased Credit Impaired
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 8 201  
Purchased impaired provision 747    
Benefit attributable to FDIC indemnification asset (451)    
Provision for loan losses charged to operations 296 (193) 201
Provision for loan losses recorded through the FDIC indemnification asset 451    
Ending balance 755 8 201
Commercial Loans | Purchased Credit Impaired
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 8 201  
Purchased impaired provision 69    
Benefit attributable to FDIC indemnification asset (55)    
Provision for loan losses charged to operations 14 (193) 201
Provision for loan losses recorded through the FDIC indemnification asset 55    
Ending balance 77 8 201
Consumer Real Estate | Purchased Credit Impaired
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Purchased impaired provision 678    
Benefit attributable to FDIC indemnification asset (396)    
Provision for loan losses charged to operations 282    
Provision for loan losses recorded through the FDIC indemnification asset 396    
Ending balance $ 678