Loans (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Composition of Loan Portfolio [Abstract]
Percentage of loan portfolio (in hundredths)	100.00%	100.00%
Amount of loan portfolio	$ 869,284,000	$ 864,988,000	$ 887,596,000
Net deferred loan costs included in loan balances	1,783,000	1,386,000
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston	256,378,000	211,597,000
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston	220,520,000
Interest income which would have been recognized on these loans, if interest had been accrued	1,158,000	1,052,000	1,334,000
Loans, aging disclosure [Abstract]
Loans Receivable 30 59 Days Past Due	6,089,000	4,675,000
Loans Receivable 60 89 Days Past Due	1,878,000	3,944,000
90 Plus Days Past Due	15,200,000	17,978,000
All Past Due	23,167,000	26,597,000
Current	846,117,000	838,391,000
Total	869,284,000	864,988,000	887,596,000
90 Plus Days And Accruing	1,051,000	1,170,000
Nonaccrual Loans [Abstract]
Nonaccrual Loans Receivable	19,150,000	27,806,000
Average investment in impaired loans	45,019,000	28,777,000	25,836,000
Interest income recognized on impaired loans, all on cash basis	1,039,000	598,000	143,000
Recorded Investment	45,744,000	42,120,000
Unpaid Principal, Impaired Loans	49,542,000	42,120,000
Allowance for loan losses	3,539,000	2,058,000
Average Recorded Investment	45,019,000	28,777,000	25,836,000
Recognized Interest Income	1,039,000	598,000
Balance of impaired loans	45,744,000	42,120,000
Less portion for which no allowance for loan losses is allocated	(28,282,000)	(27,897,000)
Impaired Financing Receivable With Allowance	17,462,000	14,223,000
Allowance for loan losses	3,539,000	2,058,000
Balance at beginning of year	24,551,000	25,525,000
New loans	275,000	237,000
Repayments	(9,909,000)	(1,211,000)
Balance at end of year	14,917,000	24,551,000	25,525,000
With No Related Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	26,837,000	19,341,000
Recorded Investment	28,282,000	27,897,000
Unpaid Principal, Impaired Loans	31,303,000	27,897,000
Allowance for loan losses	0	0
Average Recorded Investment	26,837,000	19,341,000
Recognized Interest Income	468,000	248,000
Balance of impaired loans	28,282,000	27,897,000
Allowance for loan losses	0	0
With an Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	18,182,000	9,436,000
Recorded Investment	17,462,000	14,223,000
Unpaid Principal, Impaired Loans	18,239,000	14,223,000
Allowance for loan losses	3,539,000	2,058,000
Average Recorded Investment	18,182,000	9,436,000
Recognized Interest Income	571,000	350,000
Balance of impaired loans	17,462,000	14,223,000
Allowance for loan losses	3,539,000	2,058,000
Commercial Real Estate [Member]
Composition of Loan Portfolio [Abstract]
Percentage of loan portfolio (in hundredths)	28.90%	29.50%
Amount of loan portfolio	251,335,000	255,424,000
Loans, aging disclosure [Abstract]
Loans Receivable 30 59 Days Past Due	2,172,000	1,367,000
Loans Receivable 60 89 Days Past Due	346,000	1,505,000
90 Plus Days Past Due	2,380,000	3,992,000
All Past Due	4,898,000	6,864,000
Current	246,437,000	248,560,000
Total	251,335,000	255,424,000
90 Plus Days And Accruing	102,000	0
Nonaccrual Loans [Abstract]
Nonaccrual Loans Receivable	4,603,000	7,064,000
Average investment in impaired loans	14,716,000	7,519,000
Recorded Investment	15,774,000	10,141,000
Unpaid Principal, Impaired Loans	16,981,000	10,141,000
Allowance for loan losses	1,523,000	808,000
Average Recorded Investment	14,716,000	7,519,000
Recognized Interest Income	410,000	126,000
Balance of impaired loans	15,774,000	10,141,000
Allowance for loan losses	1,523,000	808,000
Commercial Real Estate [Member] \| With No Related Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	10,102,000	5,212,000
Recorded Investment	9,386,000	5,584,000
Unpaid Principal, Impaired Loans	9,963,000	5,584,000
Allowance for loan losses	0	0
Average Recorded Investment	10,102,000	5,212,000
Recognized Interest Income	199,000	23,000
Balance of impaired loans	9,386,000	5,584,000
Allowance for loan losses	0	0
Commercial Real Estate [Member] \| With an Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	4,614,000	2,307,000
Recorded Investment	6,388,000	4,557,000
Unpaid Principal, Impaired Loans	7,018,000	4,557,000
Allowance for loan losses	1,523,000	808,000
Average Recorded Investment	4,614,000	2,307,000
Recognized Interest Income	211,000	103,000
Balance of impaired loans	6,388,000	4,557,000
Allowance for loan losses	1,523,000	808,000
Commercial Construction [Member]
Composition of Loan Portfolio [Abstract]
Percentage of loan portfolio (in hundredths)	2.60%	3.80%
Amount of loan portfolio	22,417,000	32,574,000
Loans, aging disclosure [Abstract]
Loans Receivable 30 59 Days Past Due		0
Loans Receivable 60 89 Days Past Due	29,000	174,000
90 Plus Days Past Due	35,000	1,603,000
All Past Due	64,000	1,777,000
Current	22,353,000	30,797,000
Total	22,417,000	32,574,000
90 Plus Days And Accruing	0	0
Nonaccrual Loans [Abstract]
Nonaccrual Loans Receivable	101,000	2,350,000
Average investment in impaired loans	4,349,000	1,318,000
Recorded Investment	3,354,000	5,702,000
Unpaid Principal, Impaired Loans	3,368,000	5,702,000
Allowance for loan losses	969,000	33,000
Average Recorded Investment	4,349,000	1,318,000
Recognized Interest Income	85,000	143,000
Balance of impaired loans	3,354,000	5,702,000
Allowance for loan losses	969,000	33,000
Commercial Construction [Member] \| With No Related Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	2,533,000	1,072,000
Recorded Investment	101,000	5,172,000
Unpaid Principal, Impaired Loans	115,000	5,172,000
Allowance for loan losses	0	0
Average Recorded Investment	2,533,000	1,072,000
Recognized Interest Income	0	143,000
Balance of impaired loans	101,000	5,172,000
Allowance for loan losses	0	0
Commercial Construction [Member] \| With an Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	1,816,000	247,000
Recorded Investment	3,253,000	530,000
Unpaid Principal, Impaired Loans	3,253,000	530,000
Allowance for loan losses	969,000	33,000
Average Recorded Investment	1,816,000	247,000
Recognized Interest Income	85,000	0
Balance of impaired loans	3,253,000	530,000
Allowance for loan losses	969,000	33,000
Commercial Other [Member]
Composition of Loan Portfolio [Abstract]
Percentage of loan portfolio (in hundredths)	9.30%	10.10%
Amount of loan portfolio	81,183,000	86,982,000
Loans, aging disclosure [Abstract]
Loans Receivable 30 59 Days Past Due	658,000	665,000
Loans Receivable 60 89 Days Past Due	218,000	766,000
90 Plus Days Past Due	2,306,000	1,192,000
All Past Due	3,182,000	2,623,000
Current	78,001,000	84,359,000
Total	81,183,000	86,982,000
90 Plus Days And Accruing	2,000	52,000
Nonaccrual Loans [Abstract]
Nonaccrual Loans Receivable	3,459,000	5,784,000
Average investment in impaired loans	4,851,000	2,600,000
Recorded Investment	5,861,000	7,042,000
Unpaid Principal, Impaired Loans	6,471,000	7,042,000
Allowance for loan losses	652,000	402,000
Average Recorded Investment	4,851,000	2,600,000
Recognized Interest Income	91,000	47,000
Balance of impaired loans	5,861,000	7,042,000
Allowance for loan losses	652,000	402,000
Commercial Other [Member] \| With No Related Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	2,877,000	1,918,000
Recorded Investment	4,737,000	6,022,000
Unpaid Principal, Impaired Loans	5,345,000	6,022,000
Allowance for loan losses	0	0
Average Recorded Investment	2,877,000	1,918,000
Recognized Interest Income	53,000	28,000
Balance of impaired loans	4,737,000	6,022,000
Allowance for loan losses	0	0
Commercial Other [Member] \| With an Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	1,974,000	681,000
Recorded Investment	1,124,000	1,020,000
Unpaid Principal, Impaired Loans	1,126,000	1,020,000
Allowance for loan losses	652,000	402,000
Average Recorded Investment	1,974,000	681,000
Recognized Interest Income	38,000	19,000
Balance of impaired loans	1,124,000	1,020,000
Allowance for loan losses	652,000	402,000
Municipal [Member]
Composition of Loan Portfolio [Abstract]
Percentage of loan portfolio (in hundredths)	1.70%	1.90%
Amount of loan portfolio	14,704,000	16,221,000
Loans, aging disclosure [Abstract]
Loans Receivable 30 59 Days Past Due	136,000	0
Loans Receivable 60 89 Days Past Due	0	0
90 Plus Days Past Due	0	0
All Past Due	136,000	0
Current	14,568,000	16,221,000
Total	14,704,000	16,221,000
90 Plus Days And Accruing	0	0
Nonaccrual Loans [Abstract]
Nonaccrual Loans Receivable	0	0
Average investment in impaired loans	0	0
Recorded Investment	0	0
Unpaid Principal, Impaired Loans	0	0
Allowance for loan losses	0	0
Average Recorded Investment	0	0
Recognized Interest Income	0	0
Balance of impaired loans	0	0
Allowance for loan losses	0	0
Municipal [Member] \| With No Related Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	0	0
Recorded Investment	0	0
Unpaid Principal, Impaired Loans	0	0
Allowance for loan losses	0	0
Average Recorded Investment	0	0
Recognized Interest Income	0	0
Balance of impaired loans	0	0
Allowance for loan losses	0	0
Municipal [Member] \| With an Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	0	0
Recorded Investment	0	0
Unpaid Principal, Impaired Loans	0	0
Allowance for loan losses	0	0
Average Recorded Investment	0	0
Recognized Interest Income	0	0
Balance of impaired loans	0	0
Allowance for loan losses	0	0
Residential Term [Member]
Composition of Loan Portfolio [Abstract]
Percentage of loan portfolio (in hundredths)	43.70%	39.50%
Amount of loan portfolio	379,447,000	341,286,000
Loans, aging disclosure [Abstract]
Loans Receivable 30 59 Days Past Due	2,404,000	1,933,000
Loans Receivable 60 89 Days Past Due	1,082,000	1,398,000
90 Plus Days Past Due	9,298,000	8,843,000
All Past Due	12,784,000	12,174,000
Current	366,663,000	329,112,000
Total	379,447,000	341,286,000
90 Plus Days And Accruing	363,000	1,118,000
Nonaccrual Loans [Abstract]
Nonaccrual Loans Receivable	10,333,000	10,194,000
Average investment in impaired loans	18,867,000	15,121,000
Recorded Investment	19,444,000	16,821,000
Unpaid Principal, Impaired Loans	21,282,000	16,821,000
Allowance for loan losses	395,000	478,000
Average Recorded Investment	18,867,000	15,121,000
Recognized Interest Income	426,000	282,000
Balance of impaired loans	19,444,000	16,821,000
Allowance for loan losses	395,000	478,000
Residential Term [Member] \| With No Related Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	9,801,000	9,493,000
Recorded Investment	12,747,000	9,875,000
Unpaid Principal, Impaired Loans	14,440,000	9,875,000
Allowance for loan losses	0	0
Average Recorded Investment	9,801,000	9,493,000
Recognized Interest Income	189,000	54,000
Balance of impaired loans	12,747,000	9,875,000
Allowance for loan losses	0	0
Residential Term [Member] \| With an Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	9,066,000	5,628,000
Recorded Investment	6,697,000	6,946,000
Unpaid Principal, Impaired Loans	6,842,000	6,946,000
Allowance for loan losses	395,000	478,000
Average Recorded Investment	9,066,000	5,628,000
Recognized Interest Income	237,000	228,000
Balance of impaired loans	6,697,000	6,946,000
Allowance for loan losses	395,000	478,000
Residential Construction [Member]
Composition of Loan Portfolio [Abstract]
Percentage of loan portfolio (in hundredths)	0.70%	1.20%
Amount of loan portfolio	6,459,000	10,469,000
Loans, aging disclosure [Abstract]
Loans Receivable 30 59 Days Past Due	188,000	0
Loans Receivable 60 89 Days Past Due	0	0
90 Plus Days Past Due	0	1,198,000
All Past Due	188,000	1,198,000
Current	6,271,000	9,271,000
Total	6,459,000	10,469,000
90 Plus Days And Accruing	0	0
Nonaccrual Loans [Abstract]
Nonaccrual Loans Receivable	0	1,198,000
Average investment in impaired loans	821,000	1,205,000
Recorded Investment	0	1,198,000
Unpaid Principal, Impaired Loans	0	1,198,000
Allowance for loan losses	0	235,000
Average Recorded Investment	821,000	1,205,000
Recognized Interest Income	0	0
Balance of impaired loans	0	1,198,000
Allowance for loan losses	0	235,000
Residential Construction [Member] \| With No Related Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	560,000	961,000
Recorded Investment	0	468,000
Unpaid Principal, Impaired Loans	0	468,000
Allowance for loan losses	0	0
Average Recorded Investment	560,000	961,000
Recognized Interest Income	0	0
Balance of impaired loans	0	468,000
Allowance for loan losses	0	0
Residential Construction [Member] \| With an Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	261,000	244,000
Recorded Investment	0	730,000
Unpaid Principal, Impaired Loans	0	730,000
Allowance for loan losses	0	235,000
Average Recorded Investment	261,000	244,000
Recognized Interest Income	0	0
Balance of impaired loans	0	730,000
Allowance for loan losses	0	235,000
Home equity line of credit [Member]
Composition of Loan Portfolio [Abstract]
Percentage of loan portfolio (in hundredths)	11.40%	12.10%
Amount of loan portfolio	99,082,000	105,244,000
Loans, aging disclosure [Abstract]
Loans Receivable 30 59 Days Past Due	430,000	480,000
Loans Receivable 60 89 Days Past Due	133,000	0
90 Plus Days Past Due	1,136,000	1,134,000
All Past Due	1,699,000	1,614,000
Current	97,383,000	103,630,000
Total	99,082,000	105,244,000
90 Plus Days And Accruing	539,000	0
Nonaccrual Loans [Abstract]
Nonaccrual Loans Receivable	654,000	1,163,000
Average investment in impaired loans	1,403,000	918,000
Recorded Investment	1,311,000	1,163,000
Unpaid Principal, Impaired Loans	1,440,000	1,163,000
Allowance for loan losses	0	91,000
Average Recorded Investment	1,403,000	918,000
Recognized Interest Income	27,000	0
Balance of impaired loans	1,311,000	1,163,000
Allowance for loan losses	0	91,000
Home equity line of credit [Member] \| With No Related Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	961,000	646,000
Recorded Investment	1,311,000	739,000
Unpaid Principal, Impaired Loans	1,440,000	739,000
Allowance for loan losses	0	0
Average Recorded Investment	961,000	646,000
Recognized Interest Income	27,000	0
Balance of impaired loans	1,311,000	739,000
Allowance for loan losses	0	0
Home equity line of credit [Member] \| With an Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	442,000	272,000
Recorded Investment	0	424,000
Unpaid Principal, Impaired Loans	0	424,000
Allowance for loan losses	0	91,000
Average Recorded Investment	442,000	272,000
Recognized Interest Income	0	0
Balance of impaired loans	0	424,000
Allowance for loan losses	0	91,000
Consumer [Member]
Composition of Loan Portfolio [Abstract]
Percentage of loan portfolio (in hundredths)	1.70%	1.90%
Amount of loan portfolio	14,657,000	16,788,000
Loans, aging disclosure [Abstract]
Loans Receivable 30 59 Days Past Due	101,000	230,000
Loans Receivable 60 89 Days Past Due	70,000	101,000
90 Plus Days Past Due	45,000	16,000
All Past Due	216,000	347,000
Current	14,441,000	16,441,000
Total	14,657,000	16,788,000
90 Plus Days And Accruing	45,000	0
Nonaccrual Loans [Abstract]
Nonaccrual Loans Receivable	0	53,000
Average investment in impaired loans	12,000	96,000
Recorded Investment	0	53,000
Unpaid Principal, Impaired Loans	0	53,000
Allowance for loan losses	0	11,000
Average Recorded Investment	12,000	96,000
Recognized Interest Income	0	0
Balance of impaired loans	0	53,000
Allowance for loan losses	0	11,000
Consumer [Member] \| With No Related Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	3,000	39,000
Recorded Investment	0	37,000
Unpaid Principal, Impaired Loans	0	37,000
Allowance for loan losses	0	0
Average Recorded Investment	3,000	39,000
Recognized Interest Income	0	0
Balance of impaired loans	0	37,000
Allowance for loan losses	0	0
Consumer [Member] \| With an Allowance Recorded [Member]
Nonaccrual Loans [Abstract]
Average investment in impaired loans	9,000	57,000
Recorded Investment	0	16,000
Unpaid Principal, Impaired Loans	0	16,000
Allowance for loan losses	0	11,000
Average Recorded Investment	9,000	57,000
Recognized Interest Income	0	0
Balance of impaired loans	0	16,000
Allowance for loan losses	$ 0	$ 11,000

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Portion of loans receivable balance which has an offsetting allowance for doubtful accounts.

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No definition available.

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The portion of loans receivable balance which doesn't have an offsetting allowance for doubtful accounts.

+ References

No definition available.

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Financing receivables that are less than 60 days past due but more than 29 days past due.

+ References

No definition available.

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Financing receivables that are more than 59 days past due and less than 90 days past due.

+ References

No definition available.

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Reflects the break down of the gross carrying amount of all categories of loans and leases held in the portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases as a percentage of total portfolio.

+ References

No definition available.

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts which in aggregate exceed $60,000, due from related parties at the balance sheet date.

+ References

No definition available.

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- Definition

States the amount of the collateral pledged in support of Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (d)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1

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-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Chapter 15

-Paragraph 17

-IssueDate 2006-05-01

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 14

-Subparagraph f, h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5111-111524

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Financing receivables that are current.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

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Financing receivables that are equal to or greater than 90 days past due.

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

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Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

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- Definition

The average recorded investment related to impaired financing receivables.

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The interest income recognized during the time within that period that the financing receivables were impaired.

+ References

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The interest income recognized on a cash-basis method of accounting during the time within that period that the financing receivables were impaired.

+ References

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- Definition

The recorded investment related to impaired financing receivables.

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Amount of allowance for credit losses related to recorded investment.

+ References

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- Definition

The unpaid principal balance related to impaired financing receivables.

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Reflects the cumulative amount of interest and fees paid by borrowers which have not yet been taken into income in conformity with GAAP. Also reflects the amount of unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans that are being amortized into income as an adjustment to yield.

+ References

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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 20

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-Publisher OTS

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- Definition

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 9

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Reflects the amount of collections received from related parties to reduce the carrying amounts of loans and leases receivable due from them.

+ References

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Subparagraph a

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-Topic 860

-SubTopic 30

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