Commitments and Contingencies (Summary of Contractual and Notional Amounts of Financial Instruments) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Home Equity Line of Credit [Member]    
Financial Instruments [Line Items]    
Contractual amounts of financial instrument $ 303,815,000 $ 276,671,000
Commercial And Commercial Real Estate [Member]    
Financial Instruments [Line Items]    
Contractual amounts of financial instrument 47,066,000 26,688,000
Mortgage Loan Commitments [Member]    
Financial Instruments [Line Items]    
Contractual amounts of financial instrument 10,975,000 6,408,000
Letter of Credit [Member]    
Financial Instruments [Line Items]    
Contractual amounts of financial instrument 3,103,000 1,789,000
Other Commitments [Member]    
Financial Instruments [Line Items]    
Contractual amounts of financial instrument 1,305,000 437,000
Customer loan swaps    
Financial Instruments [Line Items]    
Notional amount of derivative 58,234,000 15,702,000
Interest rate swaps    
Financial Instruments [Line Items]    
Notional amount of derivative $ 43,000,000 $ 43,000,000