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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities $ 47,026 [1] $ 52,139 [1]
Loans, net of allowance of loan losses 2,183,394 2,117,357
Time deposits 892,383 878,794
FHLBB advances 523,989 540,450
Junior subordinated debentures 32,991 32,991
Loan servicing rights reserve 161 172
Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 47,026 52,139
Loans, net of allowance of loan losses 2,183,394 2,117,357
Loan servicing rights 851 [2] 765 [3]
Time deposits 892,383 878,794
FHLBB advances 523,989 540,450
Junior subordinated debentures 32,991 32,991
Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 48,220 52,499
Loans, net of allowance of loan losses 2,279,875 2,198,940
Loan servicing rights 1,012 [2] 937 [3]
Time deposits 903,000 891,378
FHLBB advances 560,747 577,315
Junior subordinated debentures 20,785 20,391
Level 1 [Member] | Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities      
Loans, net of allowance of loan losses      
Loan servicing rights      
Time deposits      
FHLBB advances      
Junior subordinated debentures      
Level 2 [Member] | Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 48,220 52,499
Loans, net of allowance of loan losses      
Loan servicing rights      
Time deposits 903,000 891,378
FHLBB advances 560,747 577,315
Junior subordinated debentures 20,785 20,391
Level 3 [Member] | Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities    0
Loans, net of allowance of loan losses 2,279,875 2,198,940
Loan servicing rights 1,012 [2] 937 [3]
Time deposits      
FHLBB advances      
Junior subordinated debentures      
[1] Net of other-than-temporary impairment losses.
[2] The carrying value of loan servicing rights is net of $161 thousand in reserves as of June 30, 2012. The estimated fair value does not include such adjustment.
[3] The carrying value of loan servicing rights is net of $172 thousand in reserves as of December 31, 2011. The estimated fair value does not include such adjustment.