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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Securities held to maturity, fair values $ 116,371us-gaap_HeldToMaturitySecuritiesFairValue $ 119,481us-gaap_HeldToMaturitySecuritiesFairValue
Mortgage loans held for sale recorded at fair value $ 194,816us-gaap_MortgagesHeldForSaleFairValueDisclosure $ 139,950us-gaap_MortgagesHeldForSaleFairValueDisclosure
Preferred stock, par value $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 38,178,420us-gaap_CommonStockSharesIssued 38,178,420us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 35,262,901us-gaap_CommonStockSharesOutstanding 35,262,901us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 0us-gaap_TreasuryStockShares 1,809,497us-gaap_TreasuryStockShares