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CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]    
Investments held-to-maturity, fair value $ 222,260,000us-gaap_HeldToMaturitySecuritiesFairValue $ 216,007,000us-gaap_HeldToMaturitySecuritiesFairValue
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 25,044,877us-gaap_CommonStockSharesIssued 24,990,021us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 25,044,877us-gaap_CommonStockSharesOutstanding 24,990,021us-gaap_CommonStockSharesOutstanding