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Allowance for Loan Losses (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loans evaluated individually for impairment $ 3,539,000 $ 2,058,000 $ 1,256,000
Allowance for loans evaluated collectively for impairment 8,961,000 10,942,000 12,060,000
Allowance for loan losses 12,500,000 13,000,000 13,316,000
Commercial and municipal risk-rated loans receivable 369,639,000 391,201,000  
Residential loans typical loan-to-value range, low (in hundredths) 75.00%    
Residential loans typical loan-to-value maximum (in hundredths) 80.00%    
Collateralized consumer loans to individuals loan-to-value maximum range, low (in hundredths) 80.00%    
Collateralized consumer loans to individuals loan-to-value maximum range, high (in hundredths) 90.00%    
Delinquent period before residential loans placed on non-accrual status (in days) 90D    
Delinquent period before consumer loans charged off (in days) 120D    
Allowance for loan losses      
Beginning balance 13,000,000 13,316,000 13,637,000
Charge offs 9,080,000 11,179,000 9,017,000
Recoveries 745,000 313,000 296,000
Provision 7,835,000 10,550,000 8,400,000
Ending balance 12,500,000 13,000,000 13,316,000
Allowance for loans evaluated individually for impairment 3,539,000 2,058,000 1,256,000
Ending balance collectively evaluated for impairment 8,961,000 10,942,000 12,060,000
Related loan balances      
Total 869,284,000 864,988,000 887,596,000
Ending balance specifically evaluated for impairment 45,744,000 42,120,000 25,283,000
Ending balance collectively evaluated for impairment 823,540,000 822,868,000 862,313,000
Total number of TDR loans 101 59  
Number of TDR loans past due 12 14  
Balance of total TDR loans 29,955,000 22,858,000  
Balance of TDR loans past due 2,413,000 2,841,000  
Specific reserves for total TDR loans 2,590,000 733,000  
Specific reserves for past due TDR loans 67,000 99,000  
Number of TDR loans - current period 52 31  
Pre-modification outstanding recorded investment 14,657,000 18,325,000  
Post-modification outstanding recorded investment 15,030,000 18,325,000  
Specific reserves for TDR loans - current period 1,769,000 628,000  
Number of loans classified as TDRs, greater than 30 days past due 30 30  
Balance of loans classified as TDRs, greater than 30 days past due 2,413,000 2,841,000  
Number of loans classified as troubled debt restructurings that had been placed on TDR status in previous 12 months 6 6  
Loans classified as troubled debt restructurings that had been placed on TDR status in previous 12 months 1,059,000 1,588,000  
Number of loans classified as troubled debt restructurings that are involved in bankruptcy 11    
Loans classified as troubled debt restructurings that are involved in bankruptcy 1,158,000    
Number of loans classified as troubled debt restructurings that were on non-accrual status 24    
Loans classified as troubled debt restructurings and that were on non-accrual status 3,363,000    
Number Of Loans Classified As Troubled Debt Restructurings That Are Involved In Foreclosure 5    
Loans Classified As Troubled Debt Restructurings That Are Involved In Foreclosure 521,000    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]      
Commercial real estate loans maximum loan-to-value (in hundredths) 75.00%    
Construction loans actual loan portfolio-to-Company capital (in hundredths) 23.00%    
Construction loans maximum loan portfolio-to-Company capital (in hundredths) 100.00%    
Construction and non-owner-occupied commercial real estate loan portfolio-to-Company Capital (in hundredths) 81.00%    
Construction and non-owner-occupied commercial real estate loan portfolio loan-to-Company capital (in hundredths) 300.00%    
Strong 1 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 2,021,000 2,646,000  
Above Average 2 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 26,290,000 33,072,000  
Satisfactory 3 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 54,831,000 49,326,000  
Average 4 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 143,077,000 157,589,000  
Watch 5 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 64,614,000 65,395,000  
OAEM 6 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 31,681,000 25,932,000  
Substandard 7 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 46,668,000 55,260,000  
Doubtful 8 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 457,000 1,981,000  
Specific Reserves Evaluated Individually for Impairment [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 3,539,000 2,058,000  
Allowance for loan losses      
Ending balance 3,539,000 2,058,000  
General Reserves Based on Historical Loss Experience [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 4,304,000 4,501,000  
Allowance for loan losses      
Ending balance 4,304,000 4,501,000  
Reserve for Qualitative Factors [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 3,815,000 4,433,000  
Allowance for loan losses      
Ending balance 3,815,000 4,433,000  
Unallocated Reserves [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 842,000 2,008,000  
Allowance for loan losses      
Ending balance 842,000 2,008,000  
Commercial Real Estate [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loans evaluated individually for impairment 1,523,000 808,000 192,000
Allowance for loans evaluated collectively for impairment 4,342,000 4,851,000 5,068,000
Allowance for loan losses 5,865,000 5,659,000 5,260,000
Commercial and municipal risk-rated loans receivable 251,335,000 255,424,000  
Allowance for loan losses      
Beginning balance 5,659,000 5,260,000 4,986,000
Charge offs 1,394,000 1,619,000 4,005,000
Recoveries 13,000 23,000 4,000
Provision 1,587,000 1,995,000 4,275,000
Ending balance 5,865,000 5,659,000 5,260,000
Allowance for loans evaluated individually for impairment 1,523,000 808,000 192,000
Ending balance collectively evaluated for impairment 4,342,000 4,851,000 5,068,000
Related loan balances      
Total 251,335,000 255,424,000 245,540,000
Ending balance specifically evaluated for impairment 15,774,000 10,141,000 5,946,000
Ending balance collectively evaluated for impairment 235,561,000 245,283,000 239,594,000
Total number of TDR loans 18 4  
Number of TDR loans past due 3 0  
Balance of total TDR loans 11,961,000 3,078,000  
Balance of TDR loans past due 760,000 0  
Specific reserves for total TDR loans 823,000 273,000  
Specific reserves for past due TDR loans 0 0  
Number of TDR loans - current period 13 4  
Pre-modification outstanding recorded investment 6,821,000 3,078,000  
Post-modification outstanding recorded investment 7,149,000 3,078,000  
Specific reserves for TDR loans - current period 180,000 273,000  
Commercial Real Estate [Member] | Strong 1 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 19,000 23,000  
Commercial Real Estate [Member] | Above Average 2 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 13,871,000 21,334,000  
Commercial Real Estate [Member] | Satisfactory 3 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 34,454,000 33,119,000  
Commercial Real Estate [Member] | Average 4 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 99,712,000 106,171,000  
Commercial Real Estate [Member] | Watch 5 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 43,369,000 44,215,000  
Commercial Real Estate [Member] | OAEM 6 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 26,302,000 18,309,000  
Commercial Real Estate [Member] | Substandard 7 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 33,153,000 31,575,000  
Commercial Real Estate [Member] | Doubtful 8 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 455,000 678,000  
Commercial Real Estate [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 1,523,000 808,000  
Allowance for loan losses      
Ending balance 1,523,000 808,000  
Commercial Real Estate [Member] | General Reserves Based on Historical Loss Experience [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 2,369,000 2,578,000  
Allowance for loan losses      
Ending balance 2,369,000 2,578,000  
Commercial Real Estate [Member] | Reserve for Qualitative Factors [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 1,973,000 2,273,000  
Allowance for loan losses      
Ending balance 1,973,000 2,273,000  
Commercial Real Estate [Member] | Unallocated Reserves [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Commercial Construction [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loans evaluated individually for impairment 969,000 33,000 152,000
Allowance for loans evaluated collectively for impairment 390,000 625,000 860,000
Allowance for loan losses 1,359,000 658,000 1,012,000
Commercial and municipal risk-rated loans receivable 22,417,000 32,574,000  
Allowance for loan losses      
Beginning balance 658,000 1,012,000 807,000
Charge offs 928,000 346,000 175,000
Recoveries 246,000 0 0
Provision 1,383,000 (8,000) 380,000
Ending balance 1,359,000 658,000 1,012,000
Allowance for loans evaluated individually for impairment 969,000 33,000 152,000
Ending balance collectively evaluated for impairment 390,000 625,000 860,000
Related loan balances      
Total 22,417,000 32,574,000 41,869,000
Ending balance specifically evaluated for impairment 3,354,000 5,702,000 937,000
Ending balance collectively evaluated for impairment 19,063,000 26,872,000 40,932,000
Total number of TDR loans 3 3  
Number of TDR loans past due 0 1  
Balance of total TDR loans 3,319,000 4,506,000  
Balance of TDR loans past due 0 1,154,000  
Specific reserves for total TDR loans 969,000 0  
Specific reserves for past due TDR loans 0 0  
Number of TDR loans - current period 3 3  
Pre-modification outstanding recorded investment 3,319,000 4,506,000  
Post-modification outstanding recorded investment 3,333,000 4,506,000  
Specific reserves for TDR loans - current period 969,000 0  
Commercial Construction [Member] | Strong 1 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 0 0  
Commercial Construction [Member] | Above Average 2 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 1,274,000 0  
Commercial Construction [Member] | Satisfactory 3 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 2,312,000 1,365,000  
Commercial Construction [Member] | Average 4 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 12,322,000 17,125,000  
Commercial Construction [Member] | Watch 5 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 1,721,000 3,287,000  
Commercial Construction [Member] | OAEM 6 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 79,000 2,320,000  
Commercial Construction [Member] | Substandard 7 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 4,709,000 7,323,000  
Commercial Construction [Member] | Doubtful 8 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 0 1,154,000  
Commercial Construction [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 969,000 33,000  
Allowance for loan losses      
Ending balance 969,000 33,000  
Commercial Construction [Member] | General Reserves Based on Historical Loss Experience [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 213,000 332,000  
Allowance for loan losses      
Ending balance 213,000 332,000  
Commercial Construction [Member] | Reserve for Qualitative Factors [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 177,000 293,000  
Allowance for loan losses      
Ending balance 177,000 293,000  
Commercial Construction [Member] | Unallocated Reserves [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Commercial Other [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loans evaluated individually for impairment 652,000 402,000 291,000
Allowance for loans evaluated collectively for impairment 1,398,000 1,661,000 2,086,000
Allowance for loan losses 2,050,000 2,063,000 2,377,000
Commercial and municipal risk-rated loans receivable 81,183,000 86,982,000  
Allowance for loan losses      
Beginning balance 2,063,000 2,377,000 3,363,000
Charge offs 3,215,000 6,492,000 1,125,000
Recoveries 113,000 60,000 69,000
Provision 3,089,000 6,118,000 70,000
Ending balance 2,050,000 2,063,000 2,377,000
Allowance for loans evaluated individually for impairment 652,000 402,000 291,000
Ending balance collectively evaluated for impairment 1,398,000 1,661,000 2,086,000
Related loan balances      
Total 81,183,000 86,982,000 101,462,000
Ending balance specifically evaluated for impairment 5,861,000 7,042,000 1,753,000
Ending balance collectively evaluated for impairment 75,322,000 79,940,000 99,709,000
Total number of TDR loans 23 9  
Number of TDR loans past due 0 3  
Balance of total TDR loans 3,074,000 5,350,000  
Balance of TDR loans past due 0 96,000  
Specific reserves for total TDR loans 574,000 97,000  
Specific reserves for past due TDR loans 0 47,000  
Number of TDR loans - current period 19 9  
Pre-modification outstanding recorded investment 1,887,000 5,350,000  
Post-modification outstanding recorded investment 1,903,000 5,350,000  
Specific reserves for TDR loans - current period 543,000 97,000  
Commercial Other [Member] | Strong 1 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 271,000 465,000  
Commercial Other [Member] | Above Average 2 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 4,084,000 4,229,000  
Commercial Other [Member] | Satisfactory 3 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 14,578,000 10,981,000  
Commercial Other [Member] | Average 4 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 28,618,000 31,600,000  
Commercial Other [Member] | Watch 5 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 19,524,000 17,893,000  
Commercial Other [Member] | OAEM 6 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 5,300,000 5,303,000  
Commercial Other [Member] | Substandard 7 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 8,806,000 16,362,000  
Commercial Other [Member] | Doubtful 8 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 2,000 149,000  
Commercial Other [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 652,000 402,000  
Allowance for loan losses      
Ending balance 652,000 402,000  
Commercial Other [Member] | General Reserves Based on Historical Loss Experience [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 763,000 883,000  
Allowance for loan losses      
Ending balance 763,000 883,000  
Commercial Other [Member] | Reserve for Qualitative Factors [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 635,000 778,000  
Allowance for loan losses      
Ending balance 635,000 778,000  
Commercial Other [Member] | Unallocated Reserves [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Municipal [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loans evaluated individually for impairment 0 0 0
Allowance for loans evaluated collectively for impairment 18,000 19,000 19,000
Allowance for loan losses 18,000 19,000 19,000
Commercial and municipal risk-rated loans receivable 14,704,000 16,221,000  
Allowance for loan losses      
Beginning balance 19,000 19,000 23,000
Charge offs 0 0 0
Recoveries 0 0 0
Provision (1,000) 0 (4,000)
Ending balance 18,000 19,000 19,000
Allowance for loans evaluated individually for impairment 0 0 0
Ending balance collectively evaluated for impairment 18,000 19,000 19,000
Related loan balances      
Total 14,704,000 16,221,000 21,833,000
Ending balance specifically evaluated for impairment 0 0 0
Ending balance collectively evaluated for impairment 14,704,000 16,221,000 21,833,000
Total number of TDR loans 0 0  
Number of TDR loans past due 0 0  
Balance of total TDR loans 0 0  
Balance of TDR loans past due 0 0  
Specific reserves for total TDR loans 0 0  
Specific reserves for past due TDR loans 0 0  
Number of TDR loans - current period 0 0  
Pre-modification outstanding recorded investment 0 0  
Post-modification outstanding recorded investment 0 0  
Specific reserves for TDR loans - current period 0 0  
Municipal [Member] | Strong 1 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 1,731,000 2,158,000  
Municipal [Member] | Above Average 2 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 7,061,000 7,509,000  
Municipal [Member] | Satisfactory 3 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 3,487,000 3,861,000  
Municipal [Member] | Average 4 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 2,425,000 2,693,000  
Municipal [Member] | Watch 5 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 0 0  
Municipal [Member] | OAEM 6 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 0 0  
Municipal [Member] | Substandard 7 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 0 0  
Municipal [Member] | Doubtful 8 [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Commercial and municipal risk-rated loans receivable 0 0  
Municipal [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Municipal [Member] | General Reserves Based on Historical Loss Experience [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Municipal [Member] | Reserve for Qualitative Factors [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 18,000 19,000  
Allowance for loan losses      
Ending balance 18,000 19,000  
Municipal [Member] | Unallocated Reserves [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Residential Term [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loans evaluated individually for impairment 395,000 478,000 432,000
Allowance for loans evaluated collectively for impairment 714,000 681,000 976,000
Allowance for loan losses 1,109,000 1,159,000 1,408,000
Allowance for loan losses      
Beginning balance 1,159,000 1,408,000 1,198,000
Charge offs 1,911,000 1,421,000 392,000
Recoveries 110,000 7,000 4,000
Provision 1,751,000 1,165,000 598,000
Ending balance 1,109,000 1,159,000 1,408,000
Allowance for loans evaluated individually for impairment 395,000 478,000 432,000
Ending balance collectively evaluated for impairment 714,000 681,000 976,000
Related loan balances      
Total 379,447,000 341,286,000 337,927,000
Ending balance specifically evaluated for impairment 19,444,000 16,821,000 12,455,000
Ending balance collectively evaluated for impairment 360,003,000 324,465,000 325,472,000
Total number of TDR loans 53 43  
Number of TDR loans past due 8 10  
Balance of total TDR loans 10,945,000 9,924,000  
Balance of TDR loans past due 1,624,000 1,591,000  
Specific reserves for total TDR loans 224,000 363,000  
Specific reserves for past due TDR loans 67,000 52,000  
Number of TDR loans - current period 13 15  
Pre-modification outstanding recorded investment 1,974,000 5,391,000  
Post-modification outstanding recorded investment 1,989,000 5,391,000  
Specific reserves for TDR loans - current period 77,000 258,000  
Residential Term [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 395,000 478,000  
Allowance for loan losses      
Ending balance 395,000 478,000  
Residential Term [Member] | General Reserves Based on Historical Loss Experience [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 278,000 222,000  
Allowance for loan losses      
Ending balance 278,000 222,000  
Residential Term [Member] | Reserve for Qualitative Factors [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 436,000 459,000  
Allowance for loan losses      
Ending balance 436,000 459,000  
Residential Term [Member] | Unallocated Reserves [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Residential Construction [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loans evaluated individually for impairment 0 235,000 0
Allowance for loans evaluated collectively for impairment 11,000 20,000 44,000
Allowance for loan losses 11,000 255,000 44,000
Allowance for loan losses      
Beginning balance 255,000 44,000 174,000
Charge offs 389,000 505,000 2,361,000
Recoveries 54,000 0 0
Provision 91,000 716,000 2,231,000
Ending balance 11,000 255,000 44,000
Allowance for loans evaluated individually for impairment 0 235,000 0
Ending balance collectively evaluated for impairment 11,000 20,000 44,000
Related loan balances      
Total 6,459,000 10,469,000 15,512,000
Ending balance specifically evaluated for impairment 0 1,198,000 3,567,000
Ending balance collectively evaluated for impairment 6,459,000 9,271,000 11,945,000
Total number of TDR loans 0 0  
Number of TDR loans past due 0 0  
Balance of total TDR loans 0 0  
Balance of TDR loans past due 0 0  
Specific reserves for total TDR loans 0 0  
Specific reserves for past due TDR loans 0 0  
Number of TDR loans - current period 0 0  
Pre-modification outstanding recorded investment 0 0  
Post-modification outstanding recorded investment 0 0  
Specific reserves for TDR loans - current period 0 0  
Residential Construction [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 235,000  
Allowance for loan losses      
Ending balance 0 235,000  
Residential Construction [Member] | General Reserves Based on Historical Loss Experience [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 4,000 6,000  
Allowance for loan losses      
Ending balance 4,000 6,000  
Residential Construction [Member] | Reserve for Qualitative Factors [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 7,000 14,000  
Allowance for loan losses      
Ending balance 7,000 14,000  
Residential Construction [Member] | Unallocated Reserves [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Consumer [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loans evaluated individually for impairment 0 11,000 67,000
Allowance for loans evaluated collectively for impairment 592,000 573,000 579,000
Allowance for loan losses 592,000 584,000 646,000
Allowance for loan losses      
Beginning balance 584,000 646,000 717,000
Charge offs 555,000 381,000 951,000
Recoveries 208,000 222,000 219,000
Provision 355,000 97,000 661,000
Ending balance 592,000 584,000 646,000
Allowance for loans evaluated individually for impairment 0 11,000 67,000
Ending balance collectively evaluated for impairment 592,000 573,000 579,000
Related loan balances      
Total 14,657,000 16,788,000 18,156,000
Ending balance specifically evaluated for impairment 0 53,000 106,000
Ending balance collectively evaluated for impairment 14,657,000 16,735,000 18,050,000
Total number of TDR loans 0 0  
Number of TDR loans past due 0 0  
Balance of total TDR loans 0 0  
Balance of TDR loans past due 0 0  
Specific reserves for total TDR loans 0 0  
Specific reserves for past due TDR loans 0 0  
Number of TDR loans - current period 0 0  
Pre-modification outstanding recorded investment 0 0  
Post-modification outstanding recorded investment 0 0  
Specific reserves for TDR loans - current period 0 0  
Consumer [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 11,000  
Allowance for loan losses      
Ending balance 0 11,000  
Consumer [Member] | General Reserves Based on Historical Loss Experience [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 362,000 331,000  
Allowance for loan losses      
Ending balance 362,000 331,000  
Consumer [Member] | Reserve for Qualitative Factors [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 230,000 242,000  
Allowance for loan losses      
Ending balance 230,000 242,000  
Consumer [Member] | Unallocated Reserves [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Unallocated Financing Receivables [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loans evaluated individually for impairment 0 0 0
Allowance for loans evaluated collectively for impairment 842,000 2,008,000 1,880,000
Allowance for loan losses 842,000 2,008,000 1,880,000
Allowance for loan losses      
Beginning balance 2,008,000 1,880,000 1,854,000
Charge offs 0 0 0
Recoveries 0 0 0
Provision (1,166,000) 128,000 26,000
Ending balance 842,000 2,008,000 1,880,000
Allowance for loans evaluated individually for impairment 0 0 0
Ending balance collectively evaluated for impairment 842,000 2,008,000 1,880,000
Related loan balances      
Total 0 0 0
Ending balance specifically evaluated for impairment 0 0 0
Ending balance collectively evaluated for impairment 0 0 0
Number of TDR loans - current period   0  
Pre-modification outstanding recorded investment   0  
Post-modification outstanding recorded investment   0  
Specific reserves for TDR loans - current period   0  
Unallocated Financing Receivables [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Unallocated Financing Receivables [Member] | General Reserves Based on Historical Loss Experience [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Unallocated Financing Receivables [Member] | Reserve for Qualitative Factors [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance 0 0  
Unallocated Financing Receivables [Member] | Unallocated Reserves [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 842,000 2,008,000  
Allowance for loan losses      
Ending balance 842,000 2,008,000  
Home Equity Line Of Credit [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loans evaluated individually for impairment 0 91,000 122,000
Allowance for loans evaluated collectively for impairment 654,000 504,000 548,000
Allowance for loan losses 654,000 595,000 670,000
Allowance for loan losses      
Beginning balance 595,000 670,000 515,000
Charge offs 688,000 415,000 8,000
Recoveries 1,000 1,000 0
Provision 746,000 339,000 163,000
Ending balance 654,000 595,000 670,000
Allowance for loans evaluated individually for impairment 0 91,000 122,000
Ending balance collectively evaluated for impairment 654,000 504,000 548,000
Related loan balances      
Total 99,082,000 105,244,000 105,297,000
Ending balance specifically evaluated for impairment 1,311,000 1,163,000 519,000
Ending balance collectively evaluated for impairment 97,771,000 104,081,000 104,778,000
Total number of TDR loans 4 0  
Number of TDR loans past due 1 0  
Balance of total TDR loans 656,000 0  
Balance of TDR loans past due 29,000 0  
Specific reserves for total TDR loans 0 0  
Specific reserves for past due TDR loans 0 0  
Number of TDR loans - current period 4 0  
Pre-modification outstanding recorded investment 656,000 0  
Post-modification outstanding recorded investment 656,000 0  
Specific reserves for TDR loans - current period 0 0  
Home Equity Line Of Credit [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 91,000  
Allowance for loan losses      
Ending balance 0 91,000  
Home Equity Line Of Credit [Member] | General Reserves Based on Historical Loss Experience [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 315,000 149,000  
Allowance for loan losses      
Ending balance 315,000 149,000  
Home Equity Line Of Credit [Member] | Reserve for Qualitative Factors [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 339,000 355,000  
Allowance for loan losses      
Ending balance 339,000 355,000  
Home Equity Line Of Credit [Member] | Unallocated Reserves [Member]
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Allowance for loan losses      
Ending balance $ 0 $ 0