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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities $ (43,569) [1] $ (52,139) [1]
Loans, net of allowance of loan losses (2,225,945) (2,117,357)
Time deposits (886,972) (878,794)
FHLBB advances (417,675) (540,450)
Junior subordinated debentures (32,991) (32,991)
Loan servicing rights reserve 182 172
Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities (43,569) (52,139)
Loans, net of allowance of loan losses (2,225,945) (2,117,357)
Loan servicing rights (902) [2] (765) [3]
Time deposits (886,972) (878,794)
FHLBB advances (417,675) (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 (45,031) (52,499)
Loans, net of allowance of loan losses (2,329,192) (2,198,940)
Loan servicing rights (1,084) [2] (937) [3]
Time deposits (896,861) (891,378)
FHLBB advances (454,248) (577,315)
Junior subordinated debentures (22,776) (20,391)
Level 1 [Member] | Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 0 0
Loans, net of allowance of loan losses 0 0
Loan servicing rights 0 0
Time deposits 0 0
FHLBB advances 0 0
Junior subordinated debentures 0 0
Level 2 [Member] | Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities (45,031) (52,499)
Loans, net of allowance of loan losses 0 0
Loan servicing rights 0 0
Time deposits (896,861) (891,378)
FHLBB advances (454,248) (577,315)
Junior subordinated debentures (22,776) (20,391)
Level 3 [Member] | Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 0 0
Loans, net of allowance of loan losses (2,329,192) (2,198,940)
Loan servicing rights (1,084) [2] (937) [3]
Time deposits 0 0
FHLBB advances 0 0
Junior subordinated debentures $ 0 $ 0
[1] Net of other-than-temporary impairment losses.
[2] The carrying value of loan servicing rights is net of $182 thousand in reserves as of September 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.