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CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Investment securities held to maturity - fair value $ 670,611us-gaap_HeldToMaturitySecuritiesFairValue $ 647,723us-gaap_HeldToMaturitySecuritiesFairValue
Loans - allowance for loan losses $ 62,801us-gaap_LoansAndLeasesReceivableAllowance $ 63,964us-gaap_LoansAndLeasesReceivableAllowance
Common Stock, stated value (in dollars per share) $ 0.125us-gaap_CommonStockParOrStatedValuePerShare $ 0.125us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Authorized (in shares) 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Issued (in shares) 37,781,488us-gaap_CommonStockSharesIssued 37,669,948us-gaap_CommonStockSharesIssued
Common Stock, Outstanding (in shares) 37,781,488us-gaap_CommonStockSharesOutstanding 37,669,948us-gaap_CommonStockSharesOutstanding
Preferred Stock, par value (in dollars per share) $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, liquidation value per share (in dollars per share) $ 1,000us-gaap_PreferredStockLiquidationPreference $ 1,000us-gaap_PreferredStockLiquidationPreference
Preferred Stock, Authorized (in shares) 600us-gaap_PreferredStockSharesAuthorized 600us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Issued (in shares) 125us-gaap_PreferredStockSharesIssued 125us-gaap_PreferredStockSharesIssued
Preferred Stock, Outstanding (in shares) 125us-gaap_PreferredStockSharesOutstanding 125us-gaap_PreferredStockSharesOutstanding