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Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items]    
Total carrying amount $ 9,772us-gaap_NotesReceivableNet $ 9,821us-gaap_NotesReceivableNet
Commercial Portfolio Segment [Member]    
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items]    
Total carrying amount 7,146us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 7,199us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Portfolio Segment [Member]    
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items]    
Total carrying amount 1,807us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 1,816us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Residential Portfolio Segment [Member]    
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items]    
Total carrying amount $ 819us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 $ 806us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember