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Goodwill and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Identified intangible assets      
Carrying Amount $ 60,697us-gaap_FiniteLivedIntangibleAssetsGross $ 60,697us-gaap_FiniteLivedIntangibleAssetsGross  
Accumulated Amortization 59,900us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 57,511us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Total identified intangibles, Net 797us-gaap_IntangibleAssetsNetExcludingGoodwill 3,186us-gaap_IntangibleAssetsNetExcludingGoodwill  
Amortization expense 2,389us-gaap_AmortizationOfIntangibleAssets 4,633us-gaap_AmortizationOfIntangibleAssets 4,651us-gaap_AmortizationOfIntangibleAssets
Estimated amortization expense for each of the five succeeding fiscal years and thereafter      
2015 452us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
2016 295us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2017 25us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2018 25us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Total 797us-gaap_FiniteLivedIntangibleAssetsNet    
Changes in carrying amount of goodwill 0us-gaap_GoodwillPeriodIncreaseDecrease 0us-gaap_GoodwillPeriodIncreaseDecrease  
Core deposit premium      
Identified intangible assets      
Carrying Amount 58,675us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
58,675us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Accumulated Amortization 58,379us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
56,298us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Total identified intangibles, Net 296us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
2,377us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Identified intangible (contract rights)      
Identified intangible assets      
Carrying Amount 2,022us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractualRightsMember
2,022us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractualRightsMember
 
Accumulated Amortization 1,521us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractualRightsMember
1,213us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractualRightsMember
 
Total identified intangibles, Net $ 501us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractualRightsMember
$ 809us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractualRightsMember