Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 203,429		$ 288,082
Federal Home Loan Bank of Boston [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Scheduled maturity due in year one	17,131
Redeemed at call date due in year one	17,131	[1]
Weighted average rate in year one	0.61%	[2]
Scheduled maturity due in year two	1,569
Redeemed at call date due from one to two years	1,569	[1]
Weigted average rate from one to two years	4.89%	[2]
Scheduled maturity due in year three	43,130
Redeemed at call date due from two to thee years	43,130	[1]
Weighted average rate from two to three years	3.10%	[2]
Scheduled maturity due in year four	41,045
Redeemed at call date due from three to four years	41,045	[1]
Weighted average rate from three to four years	3.16%	[2]
Scheduled maturities due in year five	64,803
Redeemed at call date due from four to five years	64,803	[1]
Weighted average rate from four to five years	3.85%	[2]
Scheduled maturity due after year five	35,751
Redeemed at call date due after five years	35,751	[1]
Weighted average rate after five years	4.50%	[2]
Federal Home Loan Bank advances	203,429		288,082
Total redemption at call date	$ 203,429	[1]
Total weighted average rate	3.40%	[2]

[1] Callable FHLBB advances are shown in the respective periods assuming that the callable debt is redeemed at the call date while all other advances are shown in the periods corresponding to their scheduled maturity date.

[2] Weighted average rate based on scheduled maturity dates.