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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets:    
Held-to-maturity investment securities, estimated fair value $ 584,533us-gaap_HeldToMaturitySecuritiesFairValue $ 205,926us-gaap_HeldToMaturitySecuritiesFairValue
Stockholders' Equity:    
Nonvoting, noncumulative preferred stock, par value $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
Nonvoting, noncumulative preferred stock, shares authorized 100,000us-gaap_PreferredStockSharesAuthorized 100,000us-gaap_PreferredStockSharesAuthorized
Nonvoting, noncumulative preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Nonvoting, noncumulative preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding