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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Held to maturity securities $ 40,381 [1] $ 52,139 [1]    
Loans, net of allowance of loan losses 2,263,130 2,117,357    
Loan servicing rights 1,110 765 757 802
Time deposits 870,232 878,794    
FHLBB advances 361,172 540,450    
Junior subordinated debentures 32,991 32,991    
Loan servicing rights reserve 165 172    
Carrying Amount [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Held to maturity securities 40,381 52,139    
Loans, net of allowance of loan losses 2,263,130 2,117,357    
Loan servicing rights 1,110 [2] 765 [3]    
Time deposits 870,232 878,794    
FHLBB advances 361,172 540,450    
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 41,420 52,499    
Loans, net of allowance of loan losses 2,350,153 2,198,940    
Loan servicing rights 1,275 [2] 937 [3]    
Time deposits 879,705 891,378    
FHLBB advances 392,805 577,315    
Junior subordinated debentures 23,371 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 [2] 0 [3]    
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 41,420 52,499    
Loans, net of allowance of loan losses 0 0    
Loan servicing rights 0 [2] 0 [3]    
Time deposits 879,705 891,378    
FHLBB advances 392,805 577,315    
Junior subordinated debentures 23,371 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 2,350,153 2,198,940    
Loan servicing rights 1,275 [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 $165 thousand in reserves as of December 31, 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.