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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Securities held-to-maturity $ 94,191us-gaap_HeldToMaturitySecuritiesFairValue $ 5,335us-gaap_HeldToMaturitySecuritiesFairValue
Preferred stock, par value $ 25us-gaap_PreferredStockParOrStatedValuePerShare $ 25us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 500,000us-gaap_PreferredStockSharesAuthorized 500,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value $ 2.50us-gaap_CommonStockParOrStatedValuePerShare $ 2.50us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 18,499,282us-gaap_CommonStockSharesIssued 18,499,282us-gaap_CommonStockSharesIssued
Common stock, treasury shares 3,345,590us-gaap_TreasuryStockShares 2,748,922us-gaap_TreasuryStockShares