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Investment Securities (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Securities available for sale          
Amortized Cost-Equity $ 1,563,000 $ 534,000 $ 1,563,000 $ 534,000 $ 1,535,000
Amortized Cost-Total 285,303,000 314,236,000 285,303,000 314,236,000 274,816,000
Unrealized Gains 14,820,000 13,341,000 14,820,000 13,341,000 12,007,000
Unrealized Losses (223,000) (795,000) (223,000) (795,000) (621,000)
Fair Value Estimated 299,900,000 326,782,000 299,900,000 326,782,000 286,202,000
Proceeds from sales 300,000 6,000 25,437,000 75,182,000  
Gross gains 0 7,000 2,256,000 964,000  
Gross losses 0 1,000 (289,000) (727,000)  
Net gain 0 8,000 1,967,000 237,000  
Related income taxes 0 3,000 688,000 83,000  
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 15,315,000 13,568,000 15,315,000 13,568,000 14,627,000
12 months or more, Fair Value 3,295,000 9,368,000 3,295,000 9,368,000 9,292,000
Total, Fair Value 18,610,000 22,936,000 18,610,000 22,936,000 23,919,000
Less than 12 months, Unrealized Losses (119,000) (186,000) (119,000) (186,000) (162,000)
12 months or more, Unrealized Losses (135,000) (879,000) (135,000) (879,000) (634,000)
Total, Unrealized Losses (254,000) (1,065,000) (254,000) (1,065,000) (796,000)
Number Of States in New England Where FHLB Serve 6   6    
Federal Home Loan Bank stock, at cost 13,412,000 14,031,000 13,412,000 14,031,000 14,031,000
Balance at beginning of year 7,526,000 2,198,000 7,401,000 (2,057,000) (2,057,000)
Unrealized gains (losses) arising during the period 3,019,000 9,174,000 5,178,000 15,949,000  
Realized (gains) losses during the period 0 (8,000) (1,967,000) (237,000)  
Related deferred taxes (1,057,000) (3,209,000) (1,124,000) (5,500,000)  
Net change 1,962,000 5,957,000 2,087,000 10,212,000  
Balance at end of year 9,488,000 8,155,000 9,488,000 8,155,000 7,401,000
Securities to be held to maturity, cost and FMV [Abstract]          
Amortized Cost 154,256,000 129,699,000 154,256,000 129,699,000 122,661,000
Unrealized Gains 8,157,000 7,798,000 8,157,000 7,798,000 8,191,000
Unrealized Losses (31,000) (270,000) (31,000) (270,000) (175,000)
Fair Value Estimated 162,382,000 137,227,000 162,382,000 137,227,000 130,677,000
Restricted equity securities, cost and FMV [Abstract]          
Amortized Cost 14,448,000 15,443,000 14,448,000 15,443,000 15,443,000
Unrealized Gains 0 0 0 0 0
Unrealized Losses 0 0 0 0 0
Fair Value Estimated 14,448,000 15,443,000 14,448,000 15,443,000 15,443,000
Securities available for sale, maturities amortized cost [Abstract]          
Amortized cost, debt maturities, due in 1 year or less 4,592,000 4,394,000 4,592,000 4,394,000 6,617,000
Amortized cost, debt maturities, due in 1 to 5 years 50,173,000 11,188,000 50,173,000 11,188,000 18,792,000
Amortized cost, debt maturities, due in 5 to 10 years 16,908,000 34,872,000 16,908,000 34,872,000 23,219,000
Amortized cost, debt maturities, due after 10 years 212,067,000 263,248,000 212,067,000 263,248,000 224,653,000
Amortized cost, equity maturities 1,563,000 534,000 1,563,000 534,000 1,535,000
Total amortized cost, available for sale securities 285,303,000 314,236,000 285,303,000 314,236,000 274,816,000
Fair value, debt maturities, due in 1 year or less 4,652,000 4,450,000 4,652,000 4,450,000 6,773,000
Fair value, debt maturities, due in 1 to 5 years 51,286,000 11,748,000 51,286,000 11,748,000 19,473,000
Fair value, debt maturities, due in 5 to 10 years 17,965,000 36,698,000 17,965,000 36,698,000 24,065,000
Fair value, debt maturities, due after 10 years 224,489,000 273,454,000 224,489,000 273,454,000 234,458,000
Fair value, equity maturities 1,508,000 432,000 1,508,000 432,000 1,433,000
Fair Value Estimated 299,900,000 326,782,000 299,900,000 326,782,000 286,202,000
Securities to be held to maturity, maturities, amortized cost [Abstract]          
Amortized cost, due in 1 year or less 1,376,000 152,000 1,376,000 152,000 5,179,000
Amortized cost, due in 1 to 5 years 11,046,000 14,848,000 11,046,000 14,848,000 10,085,000
Amortized cost, due in 5 to 10 years 20,519,000 22,158,000 20,519,000 22,158,000 23,027,000
Amortized cost, due after 10 years 121,315,000 92,541,000 121,315,000 92,541,000 84,370,000
Total amortized cost, held to maturity securities 154,256,000 129,699,000 154,256,000 129,699,000 122,661,000
Fair value, due in 1 year or less 1,380,000 153,000 1,380,000 153,000 5,227,000
Fair value, due in 1 to 5 years 11,569,000 15,415,000 11,569,000 15,415,000 10,654,000
Fair value, due in 5 to 10 years 22,376,000 23,608,000 22,376,000 23,608,000 24,694,000
Fair value, due after 10 years 127,057,000 98,051,000 127,057,000 98,051,000 90,102,000
Fair Value Estimated 162,382,000 137,227,000 162,382,000 137,227,000 130,677,000
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 171,004,000 171,436,000 171,004,000 171,436,000 141,506,000
Number of securities temporarily impaired as a result of changes in interest rates reducing their fair value (in number of securities) 20 29 20 29 29
Number of securities temporarily impaired for 12 months or more (in number of securities) 7 12 7 12 11
Length of time for the temporary impairment (in months)     12M 12M 12M
Federal Home Loan Bank Stock [Member]
         
Restricted equity securities, cost and FMV [Abstract]          
Amortized Cost 13,412,000 14,031,000 13,412,000 14,031,000 14,031,000
Unrealized Gains 0 0 0 0 0
Unrealized Losses 0 0 0 0 0
Fair Value Estimated 13,412,000 14,031,000 13,412,000 14,031,000 14,031,000
Federal Reserve Bank Stock [Member]
         
Restricted equity securities, cost and FMV [Abstract]          
Amortized Cost 1,036,000 1,412,000 1,036,000 1,412,000 1,412,000
Unrealized Gains 0 0 0 0 0
Unrealized Losses 0 0 0 0 0
Fair Value Estimated 1,036,000 1,412,000 1,036,000 1,412,000 1,412,000
US Treasury and Government [Member]
         
Securities to be held to maturity, cost and FMV [Abstract]          
Amortized Cost 65,859,000 20,998,000 65,859,000 20,998,000 19,390,000
Unrealized Gains 390,000 180,000 390,000 180,000 132,000
Unrealized Losses (21,000) 0 (21,000) 0 0
Fair Value Estimated 66,228,000 21,178,000 66,228,000 21,178,000 19,522,000
Securities to be held to maturity, maturities, amortized cost [Abstract]          
Total amortized cost, held to maturity securities 65,859,000 20,998,000 65,859,000 20,998,000 19,390,000
Fair Value Estimated 66,228,000 21,178,000 66,228,000 21,178,000 19,522,000
Collateralized Mortgage Backed Securities [Member]
         
Securities to be held to maturity, cost and FMV [Abstract]          
Amortized Cost 44,236,000 61,048,000 44,236,000 61,048,000 56,800,000
Unrealized Gains 3,400,000 4,221,000 3,400,000 4,221,000 3,900,000
Unrealized Losses (10,000) (19,000) (10,000) (19,000) (3,000)
Fair Value Estimated 47,626,000 65,250,000 47,626,000 65,250,000 60,697,000
Securities to be held to maturity, maturities, amortized cost [Abstract]          
Total amortized cost, held to maturity securities 44,236,000 61,048,000 44,236,000 61,048,000 56,800,000
Fair Value Estimated 47,626,000 65,250,000 47,626,000 65,250,000 60,697,000
US States and Political Subdivisions Debt Securities [Member]
         
Securities to be held to maturity, cost and FMV [Abstract]          
Amortized Cost 43,861,000 47,353,000 43,861,000 47,353,000 46,171,000
Unrealized Gains 4,367,000 3,397,000 4,367,000 3,397,000 4,159,000
Unrealized Losses 0 (251,000) 0 (251,000) (172,000)
Fair Value Estimated 48,228,000 50,499,000 48,228,000 50,499,000 50,158,000
Securities to be held to maturity, maturities, amortized cost [Abstract]          
Total amortized cost, held to maturity securities 43,861,000 47,353,000 43,861,000 47,353,000 46,171,000
Fair Value Estimated 48,228,000 50,499,000 48,228,000 50,499,000 50,158,000
Corporate Debt Securities [Member]
         
Securities to be held to maturity, cost and FMV [Abstract]          
Amortized Cost 300,000 300,000 300,000 300,000 300,000
Unrealized Gains 0 0 0 0 0
Unrealized Losses 0 0 0 0 0
Fair Value Estimated 300,000 300,000 300,000 300,000 300,000
Securities to be held to maturity, maturities, amortized cost [Abstract]          
Total amortized cost, held to maturity securities 300,000 300,000 300,000 300,000 300,000
Fair Value Estimated 300,000 300,000 300,000 300,000 300,000
US Treasury and Government [Member]
         
Securities available for sale          
Amortized Cost-Debt 0 15,295,000 0 15,295,000 0
Unrealized Gains 0 1,199,000 0 1,199,000 0
Unrealized Losses 0 0 0 0 0
Fair Value Estimated 0 16,494,000 0 16,494,000 0
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 1,199,000 0 1,199,000 0 0
12 months or more, Fair Value 0 0 0 0 0
Total, Fair Value 1,199,000 0 1,199,000 0 0
Less than 12 months, Unrealized Losses (21,000) 0 (21,000) 0 0
12 months or more, Unrealized Losses 0 0 0 0 0
Total, Unrealized Losses (21,000) 0 (21,000) 0 0
Securities available for sale, maturities amortized cost [Abstract]          
Fair Value Estimated 0 16,494,000 0 16,494,000 0
Collateralized Mortgage Backed Securities [Member]
         
Securities available for sale          
Amortized Cost-Debt 183,126,000 227,180,000 183,126,000 227,180,000 191,924,000
Unrealized Gains 6,408,000 8,173,000 6,408,000 8,173,000 6,486,000
Unrealized Losses (97,000) (315,000) (97,000) (315,000) (178,000)
Fair Value Estimated 189,437,000 235,038,000 189,437,000 235,038,000 198,232,000
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 12,990,000 11,669,000 12,990,000 11,669,000 12,489,000
12 months or more, Fair Value 3,104,000 6,984,000 3,104,000 6,984,000 6,780,000
Total, Fair Value 16,094,000 18,653,000 16,094,000 18,653,000 19,269,000
Less than 12 months, Unrealized Losses (76,000) (46,000) (76,000) (46,000) (25,000)
12 months or more, Unrealized Losses (31,000) (288,000) (31,000) (288,000) (156,000)
Total, Unrealized Losses (107,000) (334,000) (107,000) (334,000) (181,000)
Securities available for sale, maturities amortized cost [Abstract]          
Fair Value Estimated 189,437,000 235,038,000 189,437,000 235,038,000 198,232,000
US States and Political Subdivisions Debt Securities [Member]
         
Securities available for sale          
Amortized Cost-Debt 100,614,000 70,124,000 100,614,000 70,124,000 80,259,000
Unrealized Gains 8,363,000 3,936,000 8,363,000 3,936,000 5,484,000
Unrealized Losses (22,000) (21,000) (22,000) (21,000) (17,000)
Fair Value Estimated 108,955,000 74,039,000 108,955,000 74,039,000 85,726,000
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 1,123,000 1,748,000 1,123,000 1,748,000 1,984,000
12 months or more, Fair Value 0 1,569,000 0 1,569,000 1,667,000
Total, Fair Value 1,123,000 3,317,000 1,123,000 3,317,000 3,651,000
Less than 12 months, Unrealized Losses (22,000) (21,000) (22,000) (21,000) (17,000)
12 months or more, Unrealized Losses 0 (251,000) 0 (251,000) (172,000)
Total, Unrealized Losses (22,000) (272,000) (22,000) (272,000) (189,000)
Securities available for sale, maturities amortized cost [Abstract]          
Fair Value Estimated 108,955,000 74,039,000 108,955,000 74,039,000 85,726,000
Corporate Debt Securities [Member]
         
Securities available for sale          
Amortized Cost-Debt 0 1,103,000 0 1,103,000 1,098,000
Unrealized Gains 0 0 0 0 0
Unrealized Losses 0 (324,000) 0 (324,000) (287,000)
Fair Value Estimated 0 779,000 0 779,000 811,000
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 0 0 0 0 0
12 months or more, Fair Value 0 779,000 0 779,000 811,000
Total, Fair Value 0 779,000 0 779,000 811,000
Less than 12 months, Unrealized Losses 0 0 0 0 0
12 months or more, Unrealized Losses 0 (324,000) 0 (324,000) (287,000)
Total, Unrealized Losses 0 (324,000) 0 (324,000) (287,000)
Securities available for sale, maturities amortized cost [Abstract]          
Fair Value Estimated 0 779,000 0 779,000 811,000
Other Equity Securities [Member]
         
Securities available for sale          
Amortized Cost-Equity 1,563,000 534,000 1,563,000 534,000 1,535,000
Unrealized Gains 49,000 33,000 49,000 33,000 37,000
Unrealized Losses (104,000) (135,000) (104,000) (135,000) (139,000)
Fair Value Estimated 1,508,000 432,000 1,508,000 432,000 1,433,000
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 3,000 151,000 3,000 151,000 154,000
12 months or more, Fair Value 191,000 36,000 191,000 36,000 34,000
Total, Fair Value 194,000 187,000 194,000 187,000 188,000
Less than 12 months, Unrealized Losses 0 (119,000) 0 (119,000) (120,000)
12 months or more, Unrealized Losses (104,000) (16,000) (104,000) (16,000) (19,000)
Total, Unrealized Losses (104,000) (135,000) (104,000) (135,000) (139,000)
Securities available for sale, maturities amortized cost [Abstract]          
Amortized cost, equity maturities 1,563,000 534,000 1,563,000 534,000 1,535,000
Fair Value Estimated $ 1,508,000 $ 432,000 $ 1,508,000 $ 432,000 $ 1,433,000