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Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Assets:    
Securities available-for-sale at amortized cost $ 619,241us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 638,395us-gaap_AvailableForSaleSecuritiesAmortizedCost
Securities held-to-maturity at fair value 1,653us-gaap_HeldToMaturitySecuritiesFairValue 1,644us-gaap_HeldToMaturitySecuritiesFairValue
Core deposit intangible, accumulated amortization $ 8,192us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ 8,138us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Shareholders' equity:    
Preferred stock, shares authorized (in shares) 300,000us-gaap_PreferredStockSharesAuthorized 300,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value (in dollars per share) $ 5us-gaap_CommonStockParOrStatedValuePerShare $ 5us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 25,000,000us-gaap_CommonStockSharesAuthorized 25,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding (in shares) 17,479,236us-gaap_CommonStockSharesOutstanding 17,466,375us-gaap_CommonStockSharesOutstanding