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Consolidated Statements of Financial Position (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Held-to-maturity, fair value $ 380,176us-gaap_HeldToMaturitySecuritiesFairValue $ 315,740us-gaap_HeldToMaturitySecuritiesFairValue $ 272,407us-gaap_HeldToMaturitySecuritiesFairValue
Accumulated depreciation of premises and equipment $ 111,270us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 108,826us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 102,163us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Preferred stock, no par value         
Preferred stock, shares authorized 200,000us-gaap_PreferredStockSharesAuthorized 200,000us-gaap_PreferredStockSharesAuthorized 200,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 45,000,000us-gaap_CommonStockSharesAuthorized 45,000,000us-gaap_CommonStockSharesAuthorized 45,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 32,847,063us-gaap_CommonStockSharesIssued 32,774,420us-gaap_CommonStockSharesIssued 29,865,841us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 32,847,063us-gaap_CommonStockSharesOutstanding 32,774,420us-gaap_CommonStockSharesOutstanding 29,865,841us-gaap_CommonStockSharesOutstanding