Loans, Allowance for Loan Losses and Credit Quality (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Summary of Nonaccrual Loans
TOTAL NONACCRUAL LOANS (1)	$ 33,061	[1]	$ 28,714	[1]
Commercial and Industrial [Member]
Summary of Nonaccrual Loans
TOTAL NONACCRUAL LOANS (1)	3,188		2,666
Commercial Real Estate [Member]
Summary of Nonaccrual Loans
TOTAL NONACCRUAL LOANS (1)	7,748		6,574
Commercial Construction [Member]
Summary of Nonaccrual Loans
TOTAL NONACCRUAL LOANS (1)	1,607
Small Business [Member]
Summary of Nonaccrual Loans
TOTAL NONACCRUAL LOANS (1)	680		570
Residential Real Estate [Member]
Summary of Nonaccrual Loans
TOTAL NONACCRUAL LOANS (1)	11,950		11,472
Consumer Home Equity [Member]
Summary of Nonaccrual Loans
TOTAL NONACCRUAL LOANS (1)	7,687		7,311
Consumer - Other [Member]
Summary of Nonaccrual Loans
TOTAL NONACCRUAL LOANS (1)	$ 201		$ 121

[1] Included in these amounts were $8.7 million and $6.6 million of nonaccruing TDRs at March 31, 2013 and December 31, 2012, respectively.