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Borrowed Funds (Narrative) (Detail)
1 Months Ended 12 Months Ended
Oct. 31, 2008
Feb. 28, 2007
USD ($)
Dec. 31, 2015
USD ($)
quarter
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2004
USD ($)
Borrowed Funds [Line Items]            
Federal funds purchased     $ 9,600,000 $ 12,000,000    
Securities sold under agreements to repurchase     883,900,000 791,100,000    
Junior subordinated deferrable interest debentures     137,115,000 $ 137,115,000    
Common equity securities         $ 144,486,000  
Proceeds from Issuance of Trust Preferred Securities     $ 133,000,000      
Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures | quarter     20      
Trust II [Member]            
Borrowed Funds [Line Items]            
Maturity date           Mar. 01, 2034
Advances, variable-rate     1.96% 1.78%   1.55%
LIBOR plus margin           Three-month LIBOR plus a margin of 1.55%
Proceeds from Issuance of Trust Preferred Securities     $ 120,000,000 $ 120,000,000   $ 120,000,000
WNB Capital Trust I [Member]            
Borrowed Funds [Line Items]            
Maturity date           Jul. 23, 2034
Advances, variable-rate     2.67% 2.58%   2.35%
LIBOR plus margin           Three-month LIBOR plus a margin of 2.35%
Proceeds from Issuance of Trust Preferred Securities     $ 13,000,000 $ 13,000,000   $ 13,000,000
Federal Funds Purchased [Member] | Minimum [Member]            
Borrowed Funds [Line Items]            
Short term debt maturity period     1 day      
Federal Funds Purchased [Member] | Maximum [Member]            
Borrowed Funds [Line Items]            
Short term debt maturity period     90 days      
Securities Sold under Agreements to Repurchase [Member] | Minimum [Member]            
Borrowed Funds [Line Items]            
Short term debt maturity period     30 days      
Securities Sold under Agreements to Repurchase [Member] | Maximum [Member]            
Borrowed Funds [Line Items]            
Short term debt maturity period     90 days      
Subordinated Notes Payable [Member]            
Borrowed Funds [Line Items]            
Subordinated Notes   $ 100,000,000        
Subordinated Notes interest rate   5.75%        
Maturity date   Feb. 15, 2017        
Advances, variable-rate   0.53% 0.89% 0.76%    
LIBOR plus margin   Three-month LIBOR plus a margin of 0.53%        
Percentage of redemption price     100.00%      
Unamortized debt issuance cost related to note     $ 130,000 $ 250,000    
Junior Subordinated Deferrable Interest Debenture [Member] | Trust II [Member]            
Borrowed Funds [Line Items]            
Derivative, term of contract 5 years          
Unamortized debt issuance cost related to note     1,000,000 1,100,000    
Junior subordinated deferrable interest debentures     123,712,000 123,712,000   123,712,000
Common equity securities           3,712,000
Junior Subordinated Deferrable Interest Debenture [Member] | WNB Capital Trust I [Member]            
Borrowed Funds [Line Items]            
Junior subordinated deferrable interest debentures     $ 13,403,000 $ 13,403,000   13,403,000
Common equity securities           $ 403,000