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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]    
Investment securities held to maturity $ 647,723us-gaap_HeldToMaturitySecuritiesFairValue $ 560,847us-gaap_HeldToMaturitySecuritiesFairValue
Common Stock, stated value (in dollars per share) $ 0.125us-gaap_CommonStockParOrStatedValuePerShare $ 0.125us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, shares authorized 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares Issued 37,669,948us-gaap_CommonStockSharesIssued 35,921,761us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding 37,669,948us-gaap_CommonStockSharesOutstanding 35,921,761us-gaap_CommonStockSharesOutstanding
Preferred Stock, par value (in dollars per share) $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, liquidation value (in dollars per share) $ 1,000us-gaap_PreferredStockLiquidationPreference $ 1,000us-gaap_PreferredStockLiquidationPreference
Preferred Stock, shares authorized 600us-gaap_PreferredStockSharesAuthorized 600us-gaap_PreferredStockSharesAuthorized
Preferred Stock, shares issued 125us-gaap_PreferredStockSharesIssued 125us-gaap_PreferredStockSharesIssued
Preferred Stock, shares outstanding 125us-gaap_PreferredStockSharesOutstanding 125us-gaap_PreferredStockSharesOutstanding