XML 27 R57.htm IDEA: XBRL DOCUMENT v2.4.0.8

Loans (Summary Of Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 38,337	$ 54,415
Unpaid Principal Balance	42,441	58,487
Related Allowance	(2,632)	(3,615)
Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	1,504	2,056
Unpaid Principal Balance	1,712	2,056
Related Allowance	(104)	(417)
Commercial and Industrial Loans [Member] | Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	210	38
Unpaid Principal Balance With No Related Allowance Recorded	219	38
Related Allowance With No Related Allowance Recorded
Commercial and Industrial Loans [Member] | Substandard [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	853	1,527
Recorded Investment With a Related Allowance Recorded	441	491
Unpaid Principal Balance With No Related Allowance Recorded	1,008	1,527
Unpaid Principal Balance With a Related Allowance Recorded	485	491
Related Allowance With No Related Allowance Recorded
Related Allowance With a Related Allowance Recorded	(104)	(417)
Real Estate Loans | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	32,193	42,483
Unpaid Principal Balance	35,240	44,124
Related Allowance	(2,385)	(2,753)
Real Estate Loans | Commercial [Member] | Pass [Member] | Less Than 35% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	3,405
Unpaid Principal Balance With No Related Allowance Recorded	3,542
Related Allowance With No Related Allowance Recorded
Real Estate Loans | Commercial [Member] | Pass [Member] | => 35% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	19,689	2,774
Unpaid Principal Balance With No Related Allowance Recorded	21,383	2,774
Related Allowance With No Related Allowance Recorded
Real Estate Loans | Commercial [Member] | Special Mention [Member] | => 35% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded		1,037
Recorded Investment With a Related Allowance Recorded	2,289	637
Unpaid Principal Balance With No Related Allowance Recorded		1,045
Unpaid Principal Balance With a Related Allowance Recorded	2,672	664
Related Allowance With No Related Allowance Recorded
Related Allowance With a Related Allowance Recorded	(52)	(57)
Real Estate Loans | Commercial [Member] | Substandard [Member] | Less Than 35% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded		1,699
Unpaid Principal Balance With No Related Allowance Recorded	706	1,699
Related Allowance With No Related Allowance Recorded
Real Estate Loans | Commercial [Member] | Substandard [Member] | => 35% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded		24,691
Recorded Investment With a Related Allowance Recorded	6,810	11,645
Unpaid Principal Balance With No Related Allowance Recorded		25,897
Unpaid Principal Balance With a Related Allowance Recorded	6,937	12,045
Related Allowance With No Related Allowance Recorded
Related Allowance With a Related Allowance Recorded	(2,333)	(2,696)
Real Estate Loans | Construction and Land [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	108	2,373
Unpaid Principal Balance	91	3,031
Related Allowance
Real Estate Loans | Construction and Land [Member] | Substandard [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	108	2,373
Unpaid Principal Balance With No Related Allowance Recorded	91	3,031
Related Allowance With No Related Allowance Recorded
Real Estate Loans | One-to-Four Family Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	1,116	3,410
Unpaid Principal Balance	1,116	4,710
Related Allowance	(19)	(5)
Real Estate Loans | One-to-Four Family Residential Mortgage [Member] | Pass [Member] | => 60% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With a Related Allowance Recorded
Unpaid Principal Balance With a Related Allowance Recorded
Related Allowance With a Related Allowance Recorded
Real Estate Loans | One-to-Four Family Residential Mortgage [Member] | Special Mention [Member] | Less Than 60% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	507
Recorded Investment With a Related Allowance Recorded		520
Unpaid Principal Balance With No Related Allowance Recorded	507
Unpaid Principal Balance With a Related Allowance Recorded		520
Related Allowance With No Related Allowance Recorded
Related Allowance With a Related Allowance Recorded		(5)
Real Estate Loans | One-to-Four Family Residential Mortgage [Member] | Special Mention [Member] | => 60% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With a Related Allowance Recorded
Unpaid Principal Balance With a Related Allowance Recorded
Related Allowance With a Related Allowance Recorded
Real Estate Loans | One-to-Four Family Residential Mortgage [Member] | Substandard [Member] | Less Than 60% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	269	49
Unpaid Principal Balance With No Related Allowance Recorded	269	49
Related Allowance With No Related Allowance Recorded
Real Estate Loans | One-to-Four Family Residential Mortgage [Member] | Substandard [Member] | => 60% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded		2,841
Recorded Investment With a Related Allowance Recorded	340
Unpaid Principal Balance With No Related Allowance Recorded		4,141
Unpaid Principal Balance With a Related Allowance Recorded	340
Related Allowance With No Related Allowance Recorded
Related Allowance With a Related Allowance Recorded	(19)
Real Estate Loans | Multi Family [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	2,074	2,150
Unpaid Principal Balance	2,545	2,621
Related Allowance	(117)	(317)
Real Estate Loans | Multi Family [Member] | Substandard [Member] | Less Than 35% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	593	510
Unpaid Principal Balance With No Related Allowance Recorded	1,064	510
Related Allowance With No Related Allowance Recorded
Real Estate Loans | Multi Family [Member] | Substandard [Member] | => 35% LTV [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded
Recorded Investment With a Related Allowance Recorded	1,481	1,640
Unpaid Principal Balance With No Related Allowance Recorded
Unpaid Principal Balance With a Related Allowance Recorded	1,481	2,111
Related Allowance With No Related Allowance Recorded
Related Allowance With a Related Allowance Recorded	(117)	(317)
Real Estate Loans | Home Equity Line of Credit
Financing Receivable, Impaired [Line Items]
Recorded investment	1,342	1,943
Unpaid Principal Balance	1,737	1,945
Related Allowance	(7)	(123)
Real Estate Loans | Home Equity Line of Credit | Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With a Related Allowance Recorded	342	356
Unpaid Principal Balance With a Related Allowance Recorded	342	356
Related Allowance With a Related Allowance Recorded	(7)	(18)
Real Estate Loans | Home Equity Line of Credit | Substandard [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With a Related Allowance Recorded	1,000	1,587
Unpaid Principal Balance With a Related Allowance Recorded	1,395	1,589
Related Allowance With a Related Allowance Recorded		$ (105)

X

- Definition

Impaired Financing Receivable Related Allowance With Allowance Recorded

+ References

No definition available.

+ Details

Name:	nfbk_ImpairedFinancingReceivableRelatedAllowanceWithAllowanceRecorded
Namespace Prefix:	nfbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Impaired Financing Receivable Related Allowance With No Allowance Recorded

+ References

No definition available.

+ Details

Name:	nfbk_ImpairedFinancingReceivableRelatedAllowanceWithNoAllowanceRecorded
Namespace Prefix:	nfbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant