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Borrowed Funds (Narrative) (Detail)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2007
USD ($)
Dec. 31, 2016
USD ($)
quarter
Dec. 31, 2015
USD ($)
Dec. 31, 2004
USD ($)
Borrowed Funds [Line Items]        
Federal funds purchased   $ 13,700 $ 9,600  
Securities sold under agreements to repurchase   963,300 883,900  
Junior subordinated deferrable interest debentures   $ 136,127 $ 136,069  
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   2.48% 1.96% 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   3.23% 2.67% 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 Notes Payable [Member]        
Borrowed Funds [Line Items]        
Subordinated Notes $ 100,000      
Subordinated Notes interest rate 5.75%      
Maturity date Feb. 15, 2017      
Advances, variable-rate 0.53% 1.43% 0.89%  
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   $ 10 $ 130  
Junior Subordinated Deferrable Interest Debenture [Member] | Trust II [Member]        
Borrowed Funds [Line Items]        
Unamortized debt issuance cost related to note   988 1,000  
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