Loans, Allowance for Loan Losses and Credit Quality (Details 13) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013		Dec. 31, 2012		Nov. 09, 2012
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Beginning of Period	$ 2,464		$ 0		$ 3,095
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(1,453)		(903)
Certain loans acquired in transfer not accounted for as debt securities accretable yield adjustment changes in expected cash flow	1,142	[1]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	335	[2]	272	[2]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, End of Period	$ 2,488		$ 2,464		$ 3,095

[1] (2) Represents changes in cash flows expected to be collected and resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s).

[2] (1) Results in increased interest income during the period in which the loan paid off.