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Investment Securities (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Securities available for sale          
Amortized Cost-Equity $ 1,863,000 $ 527,000 $ 1,863,000 $ 527,000 $ 1,535,000
Amortized Cost-Total 295,768,000 300,897,000 295,768,000 300,897,000 274,816,000
Unrealized Gains 12,015,000 4,946,000 12,015,000 4,946,000 12,007,000
Unrealized Losses (436,000) (1,565,000) (436,000) (1,565,000) (621,000)
Fair Value Estimated 307,347,000 304,278,000 307,347,000 304,278,000 286,202,000
Proceeds from sales 14,194,000 75,176,000 25,137,000 75,176,000  
Gross gains 1,444,000 957,000 2,256,000 957,000  
Gross losses 0 (728,000) (289,000) (728,000)  
Net gain 1,444,000 229,000 1,967,000 229,000  
Related income taxes 505,000 80,000 688,000 80,000  
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 21,483,000 96,238,000 21,483,000 96,238,000 14,627,000
12 months or more, Fair Value 5,328,000 6,154,000 5,328,000 6,154,000 9,292,000
Total, Fair Value 26,811,000 102,392,000 26,811,000 102,392,000 23,919,000
Less than 12 months, Unrealized Losses (194,000) (1,387,000) (194,000) (1,387,000) (162,000)
12 months or more, Unrealized Losses (283,000) (747,000) (283,000) (747,000) (634,000)
Total, Unrealized Losses (477,000) (2,134,000) (477,000) (2,134,000) (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 7,088,000 (1,389,000) 7,401,000 (2,057,000) (2,057,000)
Unrealized gains (losses) arising during the period 2,118,000 5,747,000 2,159,000 6,775,000  
Realized (gains) losses during the period (1,444,000) (229,000) (1,967,000) (229,000)  
Related deferred taxes (236,000) (1,931,000) (67,000) (2,291,000)  
Net change 438,000 3,587,000 125,000 4,255,000  
Balance at end of year 7,526,000 2,198,000 7,526,000 2,198,000 7,401,000
Securities to be held to maturity, cost and FMV [Abstract]          
Amortized Cost 135,775,000 122,970,000 135,775,000 122,970,000 122,661,000
Unrealized Gains 7,894,000 6,025,000 7,894,000 6,025,000 8,191,000
Unrealized Losses (41,000) (569,000) (41,000) (569,000) (175,000)
Fair Value Estimated 143,628,000 128,426,000 143,628,000 128,426,000 130,677,000
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 4,296,000 5,032,000 4,296,000 5,032,000 6,617,000
Amortized cost, debt maturities, due in 1 to 5 years 55,317,000 7,623,000 55,317,000 7,623,000 18,792,000
Amortized cost, debt maturities, due in 5 to 10 years 23,143,000 25,845,000 23,143,000 25,845,000 23,219,000
Amortized cost, debt maturities, due after 10 years 211,149,000 261,870,000 211,149,000 261,870,000 224,653,000
Amortized cost, equity maturities 1,863,000 527,000 1,863,000 527,000 1,535,000
Total amortized cost, available for sale securities 295,768,000 300,897,000 295,768,000 300,897,000 274,816,000
Fair value, debt maturities, due in 1 year or less 4,328,000 4,941,000 4,328,000 4,941,000 6,773,000
Fair value, debt maturities, due in 1 to 5 years 56,358,000 7,904,000 56,358,000 7,904,000 19,473,000
Fair value, debt maturities, due in 5 to 10 years 24,034,000 26,099,000 24,034,000 26,099,000 24,065,000
Fair value, debt maturities, due after 10 years 220,852,000 264,801,000 220,852,000 264,801,000 234,458,000
Fair value, equity maturities 1,775,000 533,000 1,775,000 533,000 1,433,000
Fair Value Estimated 307,347,000 304,278,000 307,347,000 304,278,000 286,202,000
Securities to be held to maturity, maturities, amortized cost [Abstract]          
Amortized cost, due in 1 year or less 1,382,000 227,000 1,382,000 227,000 5,179,000
Amortized cost, due in 1 to 5 years 13,556,000 10,633,000 13,556,000 10,633,000 10,085,000
Amortized cost, due in 5 to 10 years 21,137,000 23,562,000 21,137,000 23,562,000 23,027,000
Amortized cost, due after 10 years 99,700,000 88,548,000 99,700,000 88,548,000 84,370,000
Total amortized cost, held to maturity securities 135,775,000 122,970,000 135,775,000 122,970,000 122,661,000
Fair value, due in 1 year or less 1,399,000 227,000 1,399,000 227,000 5,227,000
Fair value, due in 1 to 5 years 14,134,000 11,147,000 14,134,000 11,147,000 10,654,000
Fair value, due in 5 to 10 years 22,958,000 24,623,000 22,958,000 24,623,000 24,694,000
Fair value, due after 10 years 105,137,000 92,429,000 105,137,000 92,429,000 90,102,000
Fair Value Estimated 143,628,000 128,426,000 143,628,000 128,426,000 130,677,000
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 140,384,000 132,827,000 140,384,000 132,827,000 141,506,000
Number of securities temporarily impaired as a result of changes in interest rates reducing their fair value (in number of securities) 30 65 30 65 29
Number of securities temporarily impaired for 12 months or more (in number of securities) 8 11 8 11 11
Length of time for the temporary impairment (in months)         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 41,197,000 12,970,000 41,197,000 12,970,000 19,390,000
Unrealized Gains 282,000 0 282,000 0 132,000
Unrealized Losses (33,000) (186,000) (33,000) (186,000) 0
Fair Value Estimated 41,446,000 12,784,000 41,446,000 12,784,000 19,522,000
Securities to be held to maturity, maturities, amortized cost [Abstract]          
Total amortized cost, held to maturity securities 41,197,000 12,970,000 41,197,000 12,970,000 19,390,000
Fair Value Estimated 41,446,000 12,784,000 41,446,000 12,784,000 19,522,000
Collateralized Mortgage Backed Securities [Member]
         
Securities to be held to maturity, cost and FMV [Abstract]          
Amortized Cost 49,992,000 60,836,000 49,992,000 60,836,000 56,800,000
Unrealized Gains 3,524,000 3,626,000 3,524,000 3,626,000 3,900,000
Unrealized Losses (8,000) (37,000) (8,000) (37,000) (3,000)
Fair Value Estimated 53,508,000 64,425,000 53,508,000 64,425,000 60,697,000
Securities to be held to maturity, maturities, amortized cost [Abstract]          
Total amortized cost, held to maturity securities 49,992,000 60,836,000 49,992,000 60,836,000 56,800,000
Fair Value Estimated 53,508,000 64,425,000 53,508,000 64,425,000 60,697,000
US States and Political Subdivisions Debt Securities [Member]
         
Securities to be held to maturity, cost and FMV [Abstract]          
Amortized Cost 44,286,000 48,864,000 44,286,000 48,864,000 46,171,000
Unrealized Gains 4,088,000 2,399,000 4,088,000 2,399,000 4,159,000
Unrealized Losses 0 (346,000) 0 (346,000) (172,000)
Fair Value Estimated 48,374,000 50,917,000 48,374,000 50,917,000 50,158,000
Securities to be held to maturity, maturities, amortized cost [Abstract]          
Total amortized cost, held to maturity securities 44,286,000 48,864,000 44,286,000 48,864,000 46,171,000
Fair Value Estimated 48,374,000 50,917,000 48,374,000 50,917,000 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 15,324,000 0 15,324,000 0
Unrealized Gains 0 799,000 0 799,000 0
Unrealized Losses 0 0 0 0 0
Fair Value Estimated 0 16,123,000 0 16,123,000 0
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 7,942,000 12,784,000 7,942,000 12,784,000 0
12 months or more, Fair Value 0 0 0 0 0
Total, Fair Value 7,942,000 12,784,000 7,942,000 12,784,000 0
Less than 12 months, Unrealized Losses (33,000) (186,000) (33,000) (186,000) 0
12 months or more, Unrealized Losses 0 0 0 0 0
Total, Unrealized Losses (33,000) (186,000) (33,000) (186,000) 0
Securities available for sale, maturities amortized cost [Abstract]          
Fair Value Estimated 0 16,123,000 0 16,123,000 0
Collateralized Mortgage Backed Securities [Member]
         
Securities available for sale          
Amortized Cost-Debt 201,552,000 220,245,000 201,552,000 220,245,000 191,924,000
Unrealized Gains 5,677,000 2,548,000 5,677,000 2,548,000 6,486,000
Unrealized Losses (250,000) (1,269,000) (250,000) (1,269,000) (178,000)
Fair Value Estimated 206,979,000 221,524,000 206,979,000 221,524,000 198,232,000
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 9,822,000 71,157,000 9,822,000 71,157,000 12,489,000
12 months or more, Fair Value 5,137,000 3,681,000 5,137,000 3,681,000 6,780,000
Total, Fair Value 14,959,000 74,838,000 14,959,000 74,838,000 19,269,000
Less than 12 months, Unrealized Losses (110,000) (1,044,000) (110,000) (1,044,000) (25,000)
12 months or more, Unrealized Losses (148,000) (262,000) (148,000) (262,000) (156,000)
Total, Unrealized Losses (258,000) (1,306,000) (258,000) (1,306,000) (181,000)
Securities available for sale, maturities amortized cost [Abstract]          
Fair Value Estimated 206,979,000 221,524,000 206,979,000 221,524,000 198,232,000
US States and Political Subdivisions Debt Securities [Member]
         
Securities available for sale          
Amortized Cost-Debt 92,353,000 63,696,000 92,353,000 63,696,000 80,259,000
Unrealized Gains 6,291,000 1,573,000 6,291,000 1,573,000 5,484,000
Unrealized Losses (51,000) (107,000) (51,000) (107,000) (17,000)
Fair Value Estimated 98,593,000 65,162,000 98,593,000 65,162,000 85,726,000
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 3,719,000 12,050,000 3,719,000 12,050,000 1,984,000
12 months or more, Fair Value 0 1,489,000 0 1,489,000 1,667,000
Total, Fair Value 3,719,000 13,539,000 3,719,000 13,539,000 3,651,000
Less than 12 months, Unrealized Losses (51,000) (142,000) (51,000) (142,000) (17,000)
12 months or more, Unrealized Losses 0 (311,000) 0 (311,000) (172,000)
Total, Unrealized Losses (51,000) (453,000) (51,000) (453,000) (189,000)
Securities available for sale, maturities amortized cost [Abstract]          
Fair Value Estimated 98,593,000 65,162,000 98,593,000 65,162,000 85,726,000
Corporate Debt Securities [Member]
         
Securities available for sale          
Amortized Cost-Debt 0 1,105,000 0 1,105,000 1,098,000
Unrealized Gains 0 0 0 0 0
Unrealized Losses 0 (169,000) 0 (169,000) (287,000)
Fair Value Estimated 0 936,000 0 936,000 811,000
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 0 0 0 0 0
12 months or more, Fair Value 0 936,000 0 936,000 811,000
Total, Fair Value 0 936,000 0 936,000 811,000
Less than 12 months, Unrealized Losses 0 0 0 0 0
12 months or more, Unrealized Losses 0 (169,000) 0 (169,000) (287,000)
Total, Unrealized Losses 0 (169,000) 0 (169,000) (287,000)
Securities available for sale, maturities amortized cost [Abstract]          
Fair Value Estimated 0 936,000 0 936,000 811,000
Other Equity Securities [Member]
         
Securities available for sale          
Amortized Cost-Equity 1,863,000 527,000 1,863,000 527,000 1,535,000
Unrealized Gains 47,000 26,000 47,000 26,000 37,000
Unrealized Losses (135,000) (20,000) (135,000) (20,000) (139,000)
Fair Value Estimated 1,775,000 533,000 1,775,000 533,000 1,433,000
Temporarily Impaired Securities [Abstract]          
Less than 12 months, Fair Value 0 247,000 0 247,000 154,000
12 months or more, Fair Value 191,000 48,000 191,000 48,000 34,000
Total, Fair Value 191,000 295,000 191,000 295,000 188,000
Less than 12 months, Unrealized Losses 0 (15,000) 0 (15,000) (120,000)
12 months or more, Unrealized Losses (135,000) (5,000) (135,000) (5,000) (19,000)
Total, Unrealized Losses (135,000) (20,000) (135,000) (20,000) (139,000)
Securities available for sale, maturities amortized cost [Abstract]          
Amortized cost, equity maturities 1,863,000 527,000 1,863,000 527,000 1,535,000
Fair Value Estimated $ 1,775,000 $ 533,000 $ 1,775,000 $ 533,000 $ 1,433,000