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Borrowed Funds (Narrative) (Detail)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 17, 2017
USD ($)
Feb. 28, 2007
USD ($)
Dec. 31, 2018
USD ($)
quarter
Dec. 31, 2017
USD ($)
Dec. 31, 2016
Dec. 31, 2004
USD ($)
Borrowed Funds [Line Items]            
Federal funds purchased     $ 7,300 $ 30,600    
Securities sold under agreements to repurchase     1,360,300 1,117,200    
Subordinated notes     98,708 98,552    
Junior subordinated deferrable interest debentures     $ 136,242 $ 136,184    
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     4.29% 3.03%   1.55%
LIBOR plus margin           Three-month LIBOR plus a margin of 1.55%
Proceeds from Issuance of Trust Preferred Securities     $ 120,000 $ 120,000   $ 120,000
WNB Capital Trust I [Member]            
Borrowed Funds [Line Items]            
Maturity date           Jul. 23, 2034
Advances, variable-rate     4.83% 3.71%   2.35%
LIBOR plus margin           Three-month LIBOR plus a margin of 2.35%
Proceeds from Issuance of Trust Preferred Securities     $ 13,000 $ 13,000   $ 13,000
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 Debt [Member]            
Borrowed Funds [Line Items]            
Subordinated notes $ 100,000 $ 100,000        
Subordinated notes interest rate 4.50% 5.75%        
Maturity date Mar. 17, 2027 Feb. 15, 2017        
Advances, variable-rate   0.53%     1.43%  
LIBOR plus margin   Three-month LIBOR plus a margin of 0.53%        
Unamortized debt issuance cost related to note     $ 1,300      
Junior Subordinated Deferrable Interest Debenture [Member] | Trust II [Member]            
Borrowed Funds [Line Items]            
Unamortized debt issuance cost related to note     873 931    
Junior subordinated deferrable interest debentures     123,700 123,700   123,700
Common equity securities           3,700
Junior Subordinated Deferrable Interest Debenture [Member] | WNB Capital Trust I [Member]            
Borrowed Funds [Line Items]            
Junior subordinated deferrable interest debentures     $ 13,400 $ 13,400   13,400
Common equity securities           $ 403