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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Securities held to maturity fair values | $ 174,756 us-gaap_HeldToMaturitySecuritiesFairValue | $ 182,411 us-gaap_HeldToMaturitySecuritiesFairValue | $ 57,192 us-gaap_HeldToMaturitySecuritiesFairValue
Preferred stock, shares authorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized
common stock, shares authorized | 40,000,000 us-gaap_CommonStockSharesAuthorized | 40,000,000 us-gaap_CommonStockSharesAuthorized | 40,000,000 us-gaap_CommonStockSharesAuthorized
Common stock, shares issued | 19,740,183 us-gaap_CommonStockSharesIssued | 19,709,881 us-gaap_CommonStockSharesIssued | 19,695,316 us-gaap_CommonStockSharesIssued
Common stock, shares outstanding | 19,740,183 us-gaap_CommonStockSharesOutstanding | 19,709,881 us-gaap_CommonStockSharesOutstanding | 19,695,316 us-gaap_CommonStockSharesOutstanding
Series B Preferred Stock [Member] |  |  |
Preferred stock, shares issued | 63,500 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 63,500 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 63,500 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred stock, shares outstanding | 63,500 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 63,500 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 63,500 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series C Preferred Stock [Member] |  |  |
Preferred stock, shares issued | 728,706 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 728,706 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 728,706 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Preferred stock, shares outstanding | 728,706 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 728,706 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 728,706 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember

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