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Loans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
loan
Dec. 31, 2012
loan
Dec. 31, 2011
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Number of Contracts 99 101  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 3,610 $ 15,030  
Financing Receivable, Modifications, Post-Modification Recorded Investment 3,604 14,657  
Balance of total TDR loans 29,098 29,955  
Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In T D R In Previous12 Months 16 12  
Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In T D R In Previous12 Months 3,261 2,413  
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due, Placed in T D R in Previous 12 months, Specific Allowance during Period 37 67  
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance During Period 1,017 2,590  
Financing Receivable Modifications Number Of Contracts During Period 10 52  
Financing Receivable, Loans Classified As Troubled Debt Restructurings That Are Involved In Bankruptcy 1,690    
Composition of Loan Portfolio [Abstract]      
Percentage of loan portfolio (in hundredths) 100.00% 100.00%  
Amount of loan portfolio 876,367 869,284 864,988
Net deferred loan costs included in loan balances 2,086 1,783  
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston 266,740 256,378  
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston 189,728 220,520  
Interest income which would have been recognized on these loans, if interest had been accrued 917 1,158 1,052
Loans Receivable to Related Party [Roll Forward]      
Balance at beginning of year 14,917 24,551  
New loans 909 275  
Repayments 942 9,909  
Balance at end of year 14,884 14,917 24,551
Loans, aging disclosure [Abstract]      
Loans Receivable 30 59 Days Past Due 1,588 6,089  
Loans Receivable 60 89 Days Past Due 2,471 1,878  
90 Plus Days Past Due 11,933 15,200  
All Past Due 15,992 23,167  
Current 860,375 846,117  
Ending balance 876,367 869,284 864,988
90 Plus Days And Accruing 1,043 1,051  
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 16,318 19,150  
Average investment in impaired loans 45,722 45,019 28,777
Interest income recognized on impaired loans, all on cash basis 1,750 1,039 598
Recorded Investment 42,351 45,744 42,120
Unpaid Principal, Impaired Loans 46,408 49,542 42,120
Allowance for loan losses 2,461 3,539 2,058
Average Recorded Investment 45,722 45,019 28,777
Recognized Interest Income 1,750 1,039 598
Recorded Investment 42,351 45,744 42,120
Less portion for which no allowance for loan losses is allocated (32,417) (28,282)  
Impaired Financing Receivable With Allowance 9,934 17,462  
Allowance for loan losses 2,461 3,539 2,058
Financing Receivable Modifications Pre Modification Recorded Investment During Period 3,610 15,030  
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period 31 1,769  
Balance of loans classified as TDRs, greater than 30 days past due 3,261 2,413  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 6 6  
Loans classified as troubled debt restructurings that had been placed on TDR status in previous 12 months 810 1,059  
Financing Receivable Number Of Loans Classified As Troubled Debt Restructurings That Were On Non Accrual Status 16    
Financing Receivable Loans Classified As Troubled Debt Restructurings That Were On Non Accrual Status 3,065    
Number Of Loans Classified As Troubled Debt Restructurings That Are Involved In Foreclosure 3    
Loans Classified As Troubled Debt Restructurings That Are Involved In Foreclosure 356    
Due from Related Parties 28,821 28,707  
Commercial Real Estate Other Receivable
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Number of Contracts 20 23  
Balance of total TDR loans 2,734 3,074  
Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In T D R In Previous12 Months 2 0  
Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In T D R In Previous12 Months 355 0  
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due, Placed in T D R in Previous 12 months, Specific Allowance during Period 0 0  
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance During Period 100 574  
Commercial Real Estate
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Number of Contracts 20 18  
Balance of total TDR loans 13,018 11,961  
Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In T D R In Previous12 Months 2 3  
Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In T D R In Previous12 Months 990 760  
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due, Placed in T D R in Previous 12 months, Specific Allowance during Period 0 0  
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance During Period 433 823  
Commercial Construction
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Number of Contracts 1 3  
Balance of total TDR loans 1,284 3,319  
Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In T D R In Previous12 Months 0 0  
Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In T D R In Previous12 Months 0 0  
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due, Placed in T D R in Previous 12 months, Specific Allowance during Period 0 0  
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance During Period 274 969  
Municipal
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Number of Contracts 0 0  
Balance of total TDR loans 0 0  
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance During Period 0 0  
Residential Term
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Number of Contracts 53 53  
Balance of total TDR loans 11,220 10,945  
Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In T D R In Previous12 Months 10 8  
Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In T D R In Previous12 Months 1,688 1,624  
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due, Placed in T D R in Previous 12 months, Specific Allowance during Period 37 67  
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance During Period 210 224  
Residential Construction
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Number of Contracts 0 0  
Balance of total TDR loans 0 0  
Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In T D R In Previous12 Months 0 0  
Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In T D R In Previous12 Months 0 0  
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due, Placed in T D R in Previous 12 months, Specific Allowance during Period 0 0  
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance During Period 0 0  
Home equity line of credit
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Number of Contracts 5 4  
Balance of total TDR loans 842 656  
Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In T D R In Previous12 Months 2 1  
Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In T D R In Previous12 Months 228 29  
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due, Placed in T D R in Previous 12 months, Specific Allowance during Period 0 0  
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance During Period 0 0  
Consumer
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Number of Contracts 0 0  
Balance of total TDR loans 0 0  
Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In T D R In Previous12 Months 0 0  
Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In T D R In Previous12 Months 0 0  
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due, Placed in T D R in Previous 12 months, Specific Allowance during Period 0 0  
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance During Period 0 0  
With No Related Allowance
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 31,541 26,837 19,341
Recorded Investment 32,417 28,282 27,897
Unpaid Principal, Impaired Loans 36,119 31,303 27,897
Allowance for loan losses 0 0 0
Average Recorded Investment 31,541 26,837 19,341
Recognized Interest Income 1,360 468 248
Recorded Investment 32,417 28,282 27,897
Allowance for loan losses 0 0 0
With an Allowance Recorded
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 14,181 18,182 9,436
Recorded Investment 9,934 17,462 14,223
Unpaid Principal, Impaired Loans 10,289 18,239 14,223
Allowance for loan losses 2,461 3,539 2,058
Average Recorded Investment 14,181 18,182 9,436
Recognized Interest Income 390 571 350
Recorded Investment 9,934 17,462 14,223
Allowance for loan losses 2,461 3,539 2,058
Commercial Other
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Pre-Modification Recorded Investment   1,903  
Financing Receivable, Modifications, Post-Modification Recorded Investment   1,887  
Financing Receivable Modifications Number Of Contracts During Period   19  
Composition of Loan Portfolio [Abstract]      
Percentage of loan portfolio (in hundredths) 10.90% 9.30%  
Amount of loan portfolio 95,289 81,183 86,982
Loans, aging disclosure [Abstract]      
Loans Receivable 30 59 Days Past Due 544 658  
Loans Receivable 60 89 Days Past Due 128 218  
90 Plus Days Past Due 2,797 2,306  
All Past Due 3,469 3,182  
Current 91,820 78,001  
Ending balance 95,289 81,183 86,982
90 Plus Days And Accruing 0 2  
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 4,370 3,459  
Average investment in impaired loans 5,898 4,851 2,599
Recorded Investment 6,698 5,861 7,042
Unpaid Principal, Impaired Loans 8,441 6,471 7,042
Allowance for loan losses 841 652 402
Average Recorded Investment 5,898 4,851 2,599
Recognized Interest Income 350 91 47
Recorded Investment 6,698 5,861 7,042
Allowance for loan losses 841 652 402
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period   543  
Commercial Other | With No Related Allowance
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 4,265 2,877 1,918
Recorded Investment 5,617 4,737 6,022
Unpaid Principal, Impaired Loans 7,309 5,345 6,022
Allowance for loan losses 0 0 0
Average Recorded Investment 4,265 2,877 1,918
Recognized Interest Income 322 53 28
Recorded Investment 5,617 4,737 6,022
Allowance for loan losses 0 0 0
Commercial Other | With an Allowance Recorded
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 1,633 1,974 681
Recorded Investment 1,081 1,124 1,020
Unpaid Principal, Impaired Loans 1,132 1,126 1,020
Allowance for loan losses 841 652 402
Average Recorded Investment 1,633 1,974 681
Recognized Interest Income 28 38 19
Recorded Investment 1,081 1,124 1,020
Allowance for loan losses 841 652 402
Commercial Real Estate Other Receivable
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 491    
Financing Receivable, Modifications, Post-Modification Recorded Investment 491    
Financing Receivable Modifications Number Of Contracts During Period 2    
Nonaccrual Loans [Abstract]      
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period 0    
Consumer Portfolio Segment
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0  
Financing Receivable Modifications Number Of Contracts During Period 0 0  
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 15,066 14,657 16,788
Loans, aging disclosure [Abstract]      
Ending balance 15,066 14,657 16,788
Nonaccrual Loans [Abstract]      
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period 0 0  
Commercial Construction
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 3,333  
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 3,319  
Financing Receivable Modifications Number Of Contracts During Period 0 3  
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 20,382 22,417 32,574
Loans, aging disclosure [Abstract]      
Ending balance 20,382 22,417 32,574
Nonaccrual Loans [Abstract]      
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period 0 969  
Commercial Real Estate Portfolio Segment
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 1,883 7,149  
Financing Receivable, Modifications, Post-Modification Recorded Investment 1,883 6,821  
Financing Receivable Modifications Number Of Contracts During Period 2 13  
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 245,943 251,335 255,424
Loans, aging disclosure [Abstract]      
Ending balance 245,943 251,335 255,424
Nonaccrual Loans [Abstract]      
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period 0 180  
Commercial Real Estate
      
Composition of Loan Portfolio [Abstract]      
Percentage of loan portfolio (in hundredths) 28.20% 28.90%  
Amount of loan portfolio 245,943 251,335  
Loans, aging disclosure [Abstract]      
Loans Receivable 30 59 Days Past Due 82 2,172  
Loans Receivable 60 89 Days Past Due 259 346  
90 Plus Days Past Due 745 2,380  
All Past Due 1,086 4,898  
Current 244,857 246,437  
Ending balance 245,943 251,335  
90 Plus Days And Accruing 0 102  
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 2,457 4,603  
Average investment in impaired loans 16,773 14,716 7,519
Recorded Investment 14,935 15,774 10,141
Unpaid Principal, Impaired Loans 15,683 16,981 10,141
Allowance for loan losses 890 1,523 808
Average Recorded Investment 16,773 14,716 7,519
Recognized Interest Income 645 410 126
Recorded Investment 14,935 15,774 10,141
Allowance for loan losses 890 1,523 808
Commercial Real Estate | With No Related Allowance
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 11,100 10,102 5,212
Recorded Investment 11,813 9,386 5,584
Unpaid Principal, Impaired Loans 12,419 9,963 5,584
Allowance for loan losses 0 0 0
Average Recorded Investment 11,100 10,102 5,212
Recognized Interest Income 495 199 23
Recorded Investment 11,813 9,386 5,584
Allowance for loan losses 0 0 0
Commercial Real Estate | With an Allowance Recorded
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 5,673 4,614 2,307
Recorded Investment 3,122 6,388 4,557
Unpaid Principal, Impaired Loans 3,264 7,018 4,557
Allowance for loan losses 890 1,523 808
Average Recorded Investment 5,673 4,614 2,307
Recognized Interest Income 150 211 103
Recorded Investment 3,122 6,388 4,557
Allowance for loan losses 890 1,523 808
Commercial Construction
      
Composition of Loan Portfolio [Abstract]      
Percentage of loan portfolio (in hundredths) 2.30% 2.60%  
Amount of loan portfolio 20,382 22,417  
Loans, aging disclosure [Abstract]      
Loans Receivable 30 59 Days Past Due   0  
Loans Receivable 60 89 Days Past Due 0 29  
90 Plus Days Past Due 0 35  
All Past Due 0 64  
Current 20,382 22,353  
Ending balance 20,382 22,417  
90 Plus Days And Accruing 0 0  
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 0 101  
Average investment in impaired loans 1,997 4,349 1,319
Recorded Investment 1,284 3,354 5,702
Unpaid Principal, Impaired Loans 1,284 3,368 5,702
Allowance for loan losses 272 969 33
Average Recorded Investment 1,997 4,349 1,319
Recognized Interest Income 48 85 143
Recorded Investment 1,284 3,354 5,702
Allowance for loan losses 272 969 33
Commercial Construction | With No Related Allowance
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 202 2,533 1,072
Recorded Investment 0 101 5,172
Unpaid Principal, Impaired Loans 0 115 5,172
Allowance for loan losses 0 0 0
Average Recorded Investment 202 2,533 1,072
Recognized Interest Income 0 0 143
Recorded Investment 0 101 5,172
Allowance for loan losses 0 0 0
Commercial Construction | With an Allowance Recorded
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 1,795 1,816 247
Recorded Investment 1,284 3,253 530
Unpaid Principal, Impaired Loans 1,284 3,253 530
Allowance for loan losses 272 969 33
Average Recorded Investment 1,795 1,816 247
Recognized Interest Income 48 85 0
Recorded Investment 1,284 3,253 530
Allowance for loan losses 272 969 33
Municipal
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0  
Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In T D R In Previous12 Months 0 0  
Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In T D R In Previous12 Months 0 0  
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due, Placed in T D R in Previous 12 months, Specific Allowance during Period 0 0  
Financing Receivable Modifications Number Of Contracts During Period 0 0  
Composition of Loan Portfolio [Abstract]      
Percentage of loan portfolio (in hundredths) 2.20% 1.70%  
Amount of loan portfolio 19,117 14,704 16,221
Loans, aging disclosure [Abstract]      
Loans Receivable 30 59 Days Past Due 0 136  
Loans Receivable 60 89 Days Past Due 0 0  
90 Plus Days Past Due 0 0  
All Past Due 0 136  
Current 19,117 14,568  
Ending balance 19,117 14,704 16,221
90 Plus Days And Accruing 0 0  
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 0 0  
Average investment in impaired loans 0 0 0
Recorded Investment 0 0 0
Unpaid Principal, Impaired Loans 0 0 0
Allowance for loan losses 0 0 0
Average Recorded Investment 0 0 0
Recognized Interest Income 0 0 0
Recorded Investment 0 0 0
Allowance for loan losses 0 0 0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period 0 0  
Municipal | With No Related Allowance
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 0 0 0
Recorded Investment 0 0 0
Unpaid Principal, Impaired Loans 0 0 0
Allowance for loan losses 0 0 0
Average Recorded Investment 0 0 0
Recognized Interest Income 0 0 0
Recorded Investment 0 0 0
Allowance for loan losses 0 0 0
Municipal | With an Allowance Recorded
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 0 0 0
Recorded Investment 0 0 0
Unpaid Principal, Impaired Loans 0 0 0
Allowance for loan losses 0 0 0
Average Recorded Investment 0 0 0
Recognized Interest Income 0 0 0
Recorded Investment 0 0 0
Allowance for loan losses 0 0 0
Residential Term
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 1,032 1,989  
Financing Receivable, Modifications, Post-Modification Recorded Investment 1,029 1,974  
Financing Receivable Modifications Number Of Contracts During Period 5 13  
Composition of Loan Portfolio [Abstract]      
Percentage of loan portfolio (in hundredths) 43.00% 43.70%  
Amount of loan portfolio 377,218 379,447 341,286
Loans, aging disclosure [Abstract]      
Loans Receivable 30 59 Days Past Due 229 2,404  
Loans Receivable 60 89 Days Past Due 1,913 1,082  
90 Plus Days Past Due 7,002 9,298  
All Past Due 9,144 12,784  
Current 368,074 366,663  
Ending balance 377,218 379,447 341,286
90 Plus Days And Accruing 596 363  
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 8,484 10,333  
Average investment in impaired loans 19,378 18,867 15,121
Recorded Investment 17,786 19,444 16,821
Unpaid Principal, Impaired Loans 19,116 21,282 16,821
Allowance for loan losses 404 395 478
Average Recorded Investment 19,378 18,867 15,121
Recognized Interest Income 673 426 282
Recorded Investment 17,786 19,444 16,821
Allowance for loan losses 404 395 478
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period 31 77  
Residential Term | With No Related Allowance
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 14,396 9,801 9,493
Recorded Investment 13,432 12,747 9,875
Unpaid Principal, Impaired Loans 14,600 14,440 9,875
Allowance for loan losses 0 0 0
Average Recorded Investment 14,396 9,801 9,493
Recognized Interest Income 511 189 54
Recorded Investment 13,432 12,747 9,875
Allowance for loan losses 0 0 0
Residential Term | With an Allowance Recorded
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 4,982 9,066 5,628
Recorded Investment 4,354 6,697 6,946
Unpaid Principal, Impaired Loans 4,516 6,842 6,946
Allowance for loan losses 404 395 478
Average Recorded Investment 4,982 9,066 5,628
Recognized Interest Income 162 237 228
Recorded Investment 4,354 6,697 6,946
Allowance for loan losses 404 395 478
Residential Construction
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0  
Financing Receivable Modifications Number Of Contracts During Period 0 0  
Composition of Loan Portfolio [Abstract]      
Percentage of loan portfolio (in hundredths) 1.30% 0.70%  
Amount of loan portfolio 11,803 6,459 10,469
Loans, aging disclosure [Abstract]      
Loans Receivable 30 59 Days Past Due 47 188  
Loans Receivable 60 89 Days Past Due 0 0  
90 Plus Days Past Due 0 0  
All Past Due 47 188  
Current 11,756 6,271  
Ending balance 11,803 6,459 10,469
90 Plus Days And Accruing 0 0  
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 0 0  
Average investment in impaired loans 0 821 1,205
Recorded Investment 0 0 1,198
Unpaid Principal, Impaired Loans 0 0 1,198
Allowance for loan losses 0 0 235
Average Recorded Investment 0 821 1,205
Recognized Interest Income 0 0 0
Recorded Investment 0 0 1,198
Allowance for loan losses 0 0 235
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period 0 0  
Residential Construction | With No Related Allowance
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 0 560 961
Recorded Investment 0 0 468
Unpaid Principal, Impaired Loans 0 0 468
Allowance for loan losses 0 0 0
Average Recorded Investment 0 560 961
Recognized Interest Income 0 0 0
Recorded Investment 0 0 468
Allowance for loan losses 0 0 0
Residential Construction | With an Allowance Recorded
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 0 261 244
Recorded Investment 0 0 730
Unpaid Principal, Impaired Loans 0 0 730
Allowance for loan losses 0 0 235
Average Recorded Investment 0 261 244
Recognized Interest Income 0 0 0
Recorded Investment 0 0 730
Allowance for loan losses 0 0 235
Home equity line of credit
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 204 656  
Financing Receivable, Modifications, Post-Modification Recorded Investment 201 656  
Financing Receivable Modifications Number Of Contracts During Period 1 4  
Composition of Loan Portfolio [Abstract]      
Percentage of loan portfolio (in hundredths) 10.40% 11.40%  
Amount of loan portfolio 91,549 99,082 105,244
Loans, aging disclosure [Abstract]      
Loans Receivable 30 59 Days Past Due 573 430  
Loans Receivable 60 89 Days Past Due 145 133  
90 Plus Days Past Due 1,001 1,136  
All Past Due 1,719 1,699  
Current 89,830 97,383  
Ending balance 91,549 99,082 105,244
90 Plus Days And Accruing 59 539  
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 1,007 654  
Average investment in impaired loans 1,676 1,403 918
Recorded Investment 1,648 1,311 1,163
Unpaid Principal, Impaired Loans 1,884 1,440 1,163
Allowance for loan losses 54 0 91
Average Recorded Investment 1,676 1,403 918
Recognized Interest Income 34 27 0
Recorded Investment 1,648 1,311 1,163
Allowance for loan losses 54 0 91
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period 0 0  
Home equity line of credit | With No Related Allowance
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 1,578 961 646
Recorded Investment 1,555 1,311 739
Unpaid Principal, Impaired Loans 1,791 1,440 739
Allowance for loan losses 0 0 0
Average Recorded Investment 1,578 961 646
Recognized Interest Income 32 27 0
Recorded Investment 1,555 1,311 739
Allowance for loan losses 0 0 0
Home equity line of credit | With an Allowance Recorded
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 98 442 272
Recorded Investment 93 0 424
Unpaid Principal, Impaired Loans 93 0 424
Allowance for loan losses 54 0 91
Average Recorded Investment 98 442 272
Recognized Interest Income 2 0 0
Recorded Investment 93 0 424
Allowance for loan losses 54 0 91
Consumer
      
Composition of Loan Portfolio [Abstract]      
Percentage of loan portfolio (in hundredths) 1.70% 1.70%  
Amount of loan portfolio 15,066 14,657  
Loans, aging disclosure [Abstract]      
Loans Receivable 30 59 Days Past Due 113 101  
Loans Receivable 60 89 Days Past Due 26 70  
90 Plus Days Past Due 388 45  
All Past Due 527 216  
Current 14,539 14,441  
Ending balance 15,066 14,657  
90 Plus Days And Accruing 388 45  
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 0 0  
Average investment in impaired loans 0 12 96
Recorded Investment 0 0 53
Unpaid Principal, Impaired Loans 0 0 53
Allowance for loan losses 0 0 11
Average Recorded Investment 0 12 96
Recognized Interest Income 0 0 0
Recorded Investment 0 0 53
Allowance for loan losses 0 0 11
Consumer | With No Related Allowance
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 0 3 39
Recorded Investment 0 0 37
Unpaid Principal, Impaired Loans 0 0 37
Allowance for loan losses 0 0 0
Average Recorded Investment 0 3 39
Recognized Interest Income 0 0 0
Recorded Investment 0 0 37
Allowance for loan losses 0 0 0
Consumer | With an Allowance Recorded
      
Nonaccrual Loans [Abstract]      
Average investment in impaired loans 0 9 57
Recorded Investment 0 0 16
Unpaid Principal, Impaired Loans 0 0 16
Allowance for loan losses 0 0 11
Average Recorded Investment 0 9 57
Recognized Interest Income 0 0 0
Recorded Investment 0 0 16
Allowance for loan losses $ 0 $ 0 $ 11
Loans Receivable in Bankruptcy
      
Schedule of Financing Receivables [Line Items]      
Financing Receivable Modifications Number Of Contracts During Period 12