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Consolidated Statements of Financial Position (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Held-to-maturity, fair value $ 315,740us-gaap_HeldToMaturitySecuritiesFairValue $ 268,271us-gaap_HeldToMaturitySecuritiesFairValue
Preferred stock, no par value $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
Preferred stock, shares authorized 200,000us-gaap_PreferredStockSharesAuthorized 200,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 45,000,000us-gaap_CommonStockSharesAuthorized 45,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares Issued 32,774,420us-gaap_CommonStockSharesIssued 29,789,825us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 32,774,420us-gaap_CommonStockSharesOutstanding 29,789,825us-gaap_CommonStockSharesOutstanding