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Debt And Credit Arrangements (Narrative) (Details)
9 Months Ended12 Months Ended9 Months Ended12 Months Ended9 Months Ended12 Months Ended9 Months Ended0 Months Ended9 Months Ended12 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
USD ($)
Dec. 31, 2010
Dec. 31, 2010
Minimum [Member]
Financial Standby Letter Of Credit [Member]
Sep. 30, 2011
Collateralized Borrowing Program [Member]
USD ($)
Dec. 31, 2010
Collateralized Borrowing Program [Member]
USD ($)
Sep. 30, 2011
FHLBB Borrowings [Member]
USD ($)
Jul. 31, 2010
FHLBB Borrowings [Member]
USD ($)
Dec. 31, 2009
FHLBB Borrowings [Member]
USD ($)
Dec. 31, 2011
Series B 8.207% Subordinated Deferrable Interest Debentures [Member]
USD ($)
Apr. 30, 2011
Bridge Credit Agreement [Member]
USD ($)
Sep. 30, 2011
Senior Debentures (Unsecured) Maturing March 1, 2020 [Member]
Sep. 30, 2011
Senior Unsecured Notes Issued On June 17 2011 [Member]
USD ($)
Sep. 30, 2011
Senior Debentures (Unsecured) Maturing October 15, 2025 [Member]
Sep. 30, 2011
Floating Rate Subordinated Unsecured Notes Maturing November 16, 2034 [Member]
EUR (€)
Sep. 30, 2011
Floating Rate Subordinated Unsecured Notes Maturing September 21, 2036 [Member]
USD ($)
Aug. 02, 2011
Committed Syndicated Credit Agreement [Member]
USD ($)
Sep. 30, 2011
Committed Syndicated Credit Agreement [Member]
GBP (£)
Dec. 31, 2012
Financial Standby Letter Of Credit [Member]
Dec. 31, 2011
Financial Standby Letter Of Credit [Member]
Sep. 30, 2011
Financial Standby Letter Of Credit [Member]
GBP (£)
Sep. 30, 2011
AIX Holdings, Inc. [Member]
USD ($)
Dec. 31, 2011
AIX Holdings, Inc. [Member]
USD ($)
Dec. 31, 2011
Professionals Direct, Inc. [Member]
USD ($)
Debt Instrument [Line Items]                       
Issuance date           June 17, 2011   8/2/2011       
Aggregate principal amount         $ 180,000,000 $ 300,000,000 € 12,000,000$ 50,000,000$ 200,000,000   £ 90,000,000   
Debt instrument interest rate           6.375%           
Debt instrument interest rate, agreed margin             3.75%3.10%        
Maturity dateJul. 20, 2020Mar. 01, 2020Jun. 15, 2021Oct. 15, 2025Nov. 16, 2034Sep. 21, 2036Aug. 01, 2015Dec. 31, 2015Dec. 31, 2014
Repurchase of subordinated debt        69,500,000              
Repurchase of surplus notes outstanding                    4,000,000  
Repurchase of capital securities                     8,000,0003,000,000
Interest rate of Series B subordinated Deferrable Interest Debentures        8.207%              
Repurchase of subordinated debt at cost        72,000,000              
Loss on the repurchase of debt(2,300,000)       2,500,000              
Advance received     27,800,000 125,000,000               
Securities borrowed      46,300,000                
Weighted average fixed interest rate     3.88%                 
Interest costs, capitalized during period     46,300,000                 
Securities held as collateral, at fair value   192,300,000162,700,000                  
Aggregate amount of borrowings   152,800,000134,500,000           10,000,000      
Total purchases of FHLBB stock   $ 8,900,000$ 8,600,000                  
Current exchange rate between GBP and US dollars1.56                      
Equity and leverage ratio  35.00%             175.00%      
Annual commitment fee percentage 1.14%