Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 322,056		$ 288,082
Federal Home Loan Bank of Boston [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Scheduled maturity through the end of the current year	135,759
Redeemed at call date maturity through the end of the current year	135,759	[1]
Weighted average rate for scheduled maturity through the end of the current year	0.36%	[2]
Scheduled maturity in year two	1,569
Redeemed at call in year one to two	1,569	[1]
Weighted average rate for scheduled maturity in year two	4.89%	[2]
Scheduled maturity in year three	43,130
Redeemed at call date in year two to three	43,130	[1]
Weighted average rate for scheduled maturity in year three	3.10%	[2]
Scheduled maturity in year four	41,045
Redeemed at call date in year three to four	41,045	[1]
Weighted average rate for scheduled maturity in year four	3.16%	[2]
Scheduled maturity in year five	64,803
Redeemed at call date in year four to five	64,803	[1]
Weighted average rate for scheduled maturity in year five	3.85%	[2]
Scheduled maturity after year five	35,750
Redeemed at call date after year five	35,750	[1]
Weighted average rate for scheduled maturity after year five	4.50%	[2]
Federal Home Loan Bank advances	322,056		288,082
Total redemption at call date	$ 322,056	[1]
Total weighted average rate	2.27%	[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.