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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Assets |  |  |
Securities to be held to maturity | $ 267,247us-gaap_HeldToMaturitySecuritiesFairValue | $ 279,704us-gaap_HeldToMaturitySecuritiesFairValue | $ 176,562us-gaap_HeldToMaturitySecuritiesFairValue
Shareholders' equity |  |  |
Common stock, par value per share (usd per share) | $ 0.01us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01us-gaap_CommonStockParOrStatedValuePerShare

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