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Investment Securities (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Securities available for sale      
Amortized Cost-Equity $ 1,863,000 $ 385,000 $ 1,535,000
Amortized Cost-Total 306,206,000 327,588,000 274,816,000
Unrealized Gains 11,389,000 2,324,000 12,007,000
Unrealized Losses (484,000) (4,461,000) (621,000)
Fair Value Estimated 317,111,000 325,451,000 286,202,000
Proceeds from sales 10,943,000    
Gross gains 812,000    
Gross losses 289,000    
Net gain 523,000 0  
Related income taxes 183,000    
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 73,680,000 219,768,000 14,627,000
12 months or more, Fair Value 6,861,000 9,124,000 9,292,000
Total, Fair Value 80,541,000 228,892,000 23,919,000
Less than 12 months, Unrealized Losses (919,000) (4,424,000) (162,000)
12 months or more, Unrealized Losses (154,000) (911,000) (634,000)
Total, Unrealized Losses (1,073,000) 5,335,000 (796,000)
Number Of States in New England Where FHLB Serve 6    
Balance at beginning of year 7,401,000    
Balance at end of year 7,088,000 (1,389,000) 7,401,000
Securities to be held to maturity, cost and FMV [Abstract]      
Amortized Cost 137,606,000 109,936,000 122,661,000
Unrealized Gains 7,616,000 4,989,000 8,191,000
Unrealized Losses (589,000) (874,000) (175,000)
Fair Value Estimated 144,633,000 114,051,000 130,677,000
Non-marketable securities, cost and FMV [Abstract]      
Unrealized Gains   0  
Unrealized Losses   0  
Securities available for sale, maturities amortized cost [Abstract]      
Amortized cost, debt maturities, due in 1 year or less 5,894,000 212,000 6,617,000
Amortized cost, debt maturities, due in 1 to 5 years 59,887,000 2,818,000 18,792,000
Amortized cost, debt maturities, due in 5 to 10 years 13,014,000 4,774,000 23,219,000
Amortized cost, debt maturities, due after 10 years 225,548,000 319,399,000 224,653,000
Amortized cost, equity maturities 1,863,000 385,000 1,535,000
Total amortized cost, available for sale securities 306,206,000 327,588,000 274,816,000
Fair value, debt maturities, due in 1 year or less 5,948,000 218,000 6,773,000
Fair value, debt maturities, due in 1 to 5 years 60,971,000 2,964,000 19,473,000
Fair value, debt maturities, due in 5 to 10 years 13,442,000 4,916,000 24,065,000
Fair value, debt maturities, due after 10 years 234,916,000 316,959,000 234,458,000
Fair value, equity maturities 1,834,000 394,000 1,433,000
Fair Value Estimated 317,111,000 325,451,000 286,202,000
Securities to be held to maturity, maturities, amortized cost [Abstract]      
Amortized cost, due in 1 year or less 4,663,000 1,072,000 5,179,000
Amortized cost, due in 1 to 5 years 12,173,000 5,629,000 10,085,000
Amortized cost, due in 5 to 10 years 35,563,000 16,974,000 23,027,000
Amortized cost, due after 10 years 85,207,000 86,261,000 84,370,000
Total amortized cost, held to maturity securities 137,606,000 109,936,000 122,661,000
Fair value, due in 1 year or less 4,710,000 1,084,000 5,227,000
Fair value, due in 1 to 5 years 12,940,000 5,948,000 10,654,000
Fair value, due in 5 to 10 years 38,100,000 17,737,000 24,694,000
Fair value, due after 10 years 88,883,000 89,282,000 90,102,000
Fair Value Estimated 144,633,000 114,051,000 130,677,000
Fair value of securities pledged to secure borrowings from the Federal Home Loan Bank of Boston, public deposits, repurchase agreements, and for other purposes as required by law 136,156,000 121,143,000 141,506,000
Number of securities temporarily impaired as a result of changes in interest rates reducing their fair value (in number of securities) 42 104 29
Number of securities temporarily impaired for 12 months or more (in number of securities) 8 12 11
Length of time for the temporary impairment (in months) 12M 12M 12M
Federal Home Loan Bank Stock [Member]
     
Non-marketable securities, cost and FMV [Abstract]      
Amortized Cost 13,412,000 14,032,000 14,032,000
Unrealized Gains 0 0 0
Unrealized Losses 0 0 0
Fair Value Estimated 13,412,000 14,032,000 14,032,000
Federal Reserve Bank Stock [Member]
     
Non-marketable securities, cost and FMV [Abstract]      
Amortized Cost 1,411,000 1,411,000 1,411,000
Unrealized Gains 0 0 0
Unrealized Losses 0 0 0
Fair Value Estimated 1,411,000 1,411,000 1,411,000
US Treasury and Government [Member]
     
Securities to be held to maturity, cost and FMV [Abstract]      
Amortized Cost 39,694,000 2,936,000 19,390,000
Unrealized Gains 37,000 0 132,000
Unrealized Losses (435,000) (292,000) 0
Fair Value Estimated 39,296,000 2,644,000 19,522,000
Securities to be held to maturity, maturities, amortized cost [Abstract]      
Total amortized cost, held to maturity securities 39,694,000 2,936,000 19,390,000
Fair Value Estimated 39,296,000 2,644,000 19,522,000
Collateralized Mortgage Backed Securities [Member]
     
Securities to be held to maturity, cost and FMV [Abstract]      
Amortized Cost 52,185,000 59,063,000 56,800,000
Unrealized Gains 3,638,000 3,348,000 3,900,000
Unrealized Losses 0 (76,000) (3,000)
Fair Value Estimated 55,823,000 62,335,000 60,697,000
Securities to be held to maturity, maturities, amortized cost [Abstract]      
Total amortized cost, held to maturity securities 52,185,000 59,063,000 56,800,000
Fair Value Estimated 55,823,000 62,335,000 60,697,000
US States and Political Subdivisions Debt Securities [Member]
     
Securities to be held to maturity, cost and FMV [Abstract]      
Amortized Cost 45,427,000 47,787,000 46,171,000
Unrealized Gains 3,941,000 1,641,000 4,159,000
Unrealized Losses 154,000 (506,000) (172,000)
Fair Value Estimated 49,214,000 48,922,000 50,158,000
Securities to be held to maturity, maturities, amortized cost [Abstract]      
Total amortized cost, held to maturity securities 45,427,000 47,787,000 46,171,000
Fair Value Estimated 49,214,000 48,922,000 50,158,000
Corporate Debt Securities [Member]
     
Securities to be held to maturity, cost and FMV [Abstract]      
Amortized Cost 300,000 150,000 300,000
Unrealized Gains 0 0 0
Unrealized Losses 0 0 0
Fair Value Estimated 300,000 150,000 300,000
Securities to be held to maturity, maturities, amortized cost [Abstract]      
Total amortized cost, held to maturity securities 300,000 150,000 300,000
Fair Value Estimated 300,000 150,000 300,000
US Treasury and Government [Member]
     
Securities available for sale      
Amortized Cost-Debt 0 15,352,000 0
Unrealized Gains 0 591,000 0
Unrealized Losses 0 0 0
Fair Value Estimated 0 15,943,000 0
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 33,514,000 2,645,000 0
12 months or more, Fair Value 0 0 0
Total, Fair Value 33,514,000 2,645,000 0
Less than 12 months, Unrealized Losses (435,000) (292,000) 0
12 months or more, Unrealized Losses 0 0 0
Total, Unrealized Losses (435,000) (292,000) 0
Securities available for sale, maturities amortized cost [Abstract]      
Fair Value Estimated 0 15,943,000 0
Collateralized Mortgage Backed Securities [Member]
     
Securities available for sale      
Amortized Cost-Debt 226,671,000 255,703,000 191,924,000
Unrealized Gains 5,805,000 1,138,000 6,486,000
Unrealized Losses (361,000) (3,731,000) (178,000)
Fair Value Estimated 232,115,000 253,110,000 198,232,000
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 35,242,000 187,278,000 12,489,000
12 months or more, Fair Value 6,608,000 6,757,000 6,780,000
Total, Fair Value 41,850,000 194,035,000 19,269,000
Less than 12 months, Unrealized Losses (280,000) (3,471,000) (25,000)
12 months or more, Unrealized Losses (81,000) (336,000) (156,000)
Total, Unrealized Losses (361,000) (3,807,000) (181,000)
Securities available for sale, maturities amortized cost [Abstract]      
Fair Value Estimated 232,115,000 253,110,000 198,232,000
US States and Political Subdivisions Debt Securities [Member]
     
Securities available for sale      
Amortized Cost-Debt 77,672,000 55,040,000 80,259,000
Unrealized Gains 5,540,000 577,000 5,484,000
Unrealized Losses (50,000) (536,000) (17,000)
Fair Value Estimated 83,162,000 55,081,000 85,726,000
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 4,924,000 29,835,000 1,984,000
12 months or more, Fair Value 0 1,398,000 1,667,000
Total, Fair Value 4,924,000 31,233,000 3,651,000
Less than 12 months, Unrealized Losses (204,000) (659,000) (17,000)
12 months or more, Unrealized Losses 0 (383,000) (172,000)
Total, Unrealized Losses (204,000) (1,042,000) (189,000)
Securities available for sale, maturities amortized cost [Abstract]      
Fair Value Estimated 83,162,000 55,081,000 85,726,000
Corporate Debt Securities [Member]
     
Securities available for sale      
Amortized Cost-Debt 0 1,108,000 1,098,000
Unrealized Gains 0 0 0
Unrealized Losses 0 (185,000) (287,000)
Fair Value Estimated 0 923,000 811,000
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 0 0 0
12 months or more, Fair Value 0 922,000 811,000
Total, Fair Value 0 922,000 811,000
Less than 12 months, Unrealized Losses 0 0 0
12 months or more, Unrealized Losses 0 (185,000) 287,000
Total, Unrealized Losses 0 (185,000) (287,000)
Securities available for sale, maturities amortized cost [Abstract]      
Fair Value Estimated 0 923,000 811,000
Other Equity Securities [Member]
     
Securities available for sale      
Amortized Cost-Equity 1,863,000 385,000 1,535,000
Unrealized Gains 44,000 18,000 37,000
Unrealized Losses (73,000) (9,000) (139,000)
Fair Value Estimated 1,834,000 394,000 1,433,000
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 0 10,000 154,000
12 months or more, Fair Value 253,000 47,000 34,000
Total, Fair Value 253,000 57,000 188,000
Less than 12 months, Unrealized Losses 0 (2,000) (120,000)
12 months or more, Unrealized Losses (73,000) (7,000) (19,000)
Total, Unrealized Losses (73,000) (9,000) (139,000)
Securities available for sale, maturities amortized cost [Abstract]      
Amortized cost, equity maturities 1,863,000 385,000 1,535,000
Fair Value Estimated $ 1,834,000 $ 394,000 $ 1,433,000