Loans and Allowance for Loan Losses (Credit Risk Exposure Indicators by Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,563,866	$ 1,514,028
Residential real estate loans
Financing Receivable, Recorded Investment [Line Items]
Loans	572,173	578,262
Residential real estate loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	555,444	560,926
Residential real estate loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans
Residential real estate loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	1,291	876
Residential real estate loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	15,438	16,460
Residential real estate loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans
Residential real estate loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans
Commercial real estate loans
Financing Receivable, Recorded Investment [Line Items]
Loans	506,231	470,061
Commercial real estate loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	440,610	413,489
Commercial real estate loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans
Commercial real estate loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	17,069	8,134
Commercial real estate loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	48,552	48,438
Commercial real estate loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans
Commercial real estate loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans
Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Loans	190,454	185,045
Commercial loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	165,460	157,141
Commercial loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans
Commercial loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	7,449	8,998
Commercial loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	17,545	18,335
Commercial loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans
Commercial loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans		571
Home equity loans
Financing Receivable, Recorded Investment [Line Items]
Loans	278,375	268,782
Home equity loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans
Home equity loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	276,742	266,112
Home equity loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans
Home equity loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans
Home equity loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	1,633	2,670
Home equity loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	16,633	11,878
Consumer loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans
Consumer loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	16,376	11,726
Consumer loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans
Consumer loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans
Consumer loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	257	152
Consumer loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans