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Allowance for Credit Losses - Allocation of Allowance for Credit Losses on Basis of Company's Impairment Methodology (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses $ 89,960 $ 81,714    
Allowance for credit losses 783,750 753,052    
Allowance for credit losses 955,992 919,562 $ 916,676 $ 925,860
Purchased Impaired [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 4,083 9,142    
Allocated [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 877,793 843,908    
Unallocated [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 78,199 75,654 $ 75,015 $ 73,775
Commercial, Financial, Leasing, etc. [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 44,752 31,779    
Allowance for credit losses 255,615 251,607    
Commercial, Financial, Leasing, etc. [Member] | Purchased Impaired [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 37 4,652    
Commercial, Financial, Leasing, etc. [Member] | Allocated [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 300,404 288,038    
Commercial Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 19,175 15,490    
Allowance for credit losses 307,000 291,244    
Commercial Real Estate [Member] | Purchased Impaired [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 656 1,193    
Commercial Real Estate [Member] | Allocated [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 326,831 307,927    
Residential Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 12,727 14,703    
Allowance for credit losses 57,624 45,061    
Residential Real Estate [Member] | Purchased Impaired [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 1,887 2,146    
Residential Real Estate [Member] | Allocated [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 72,238 61,910    
Consumer Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 13,306 19,742    
Allowance for credit losses 163,511 165,140    
Consumer Loans [Member] | Purchased Impaired [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses 1,503 1,151    
Consumer Loans [Member] | Allocated [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses $ 178,320 $ 186,033