v2.4.0.6

Securities (Details) (USD $)	9 Months Ended					3 Months Ended					9 Months Ended	3 Months Ended	9 Months Ended
Securities (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 States and political subdivisions [Member]	Dec. 31, 2011 States and political subdivisions [Member]	Sep. 30, 2011 Mortgage-backed securities [Member]	Sep. 30, 2012 Mortgage-backed securities [Member]	Dec. 31, 2011 Mortgage-backed securities [Member]	Sep. 30, 2012 Equity securities [Member]	Dec. 31, 2011 Equity securities [Member]	Sep. 30, 2011 Collateralized Debt Obligations [Member]	Jun. 30, 2011 FNMA and FHLMC Preferred Stocks [Member]	Sep. 30, 2011 FNMA and FHLMC Preferred Stocks [Member]
Securities in investment portfolio [Abstract]
Fair Value	$ 81,552,000		$ 87,140,000	$ 2,598,000	$ 3,117,000		$ 74,612,000	$ 79,762,000	$ 4,342,000	$ 4,261,000
Gross Unrealized Gain	3,294,000		1,802,000	141,000	112,000		2,915,000	1,533,000	238,000	157,000
Gross Unrealized Losses	(8,000)		(10,000)	(8,000)	(10,000)		0	0	0	0
Pledged securities	51,100,000		57,000,000
Contractual maturities of securities available-for-sale [Abstract]
Due in one year or less	124,000
Due after one year through five years	544,000
Due after five years through ten years	752,000
Due after ten years	1,178,000
Fair value debt maturities total	2,598,000
Total securities available for sale	81,552,000		87,140,000	2,598,000	3,117,000		74,612,000	79,762,000	4,342,000	4,261,000
Available for sale securities, sales						19,600,000
Available for sale securities, realized gains						135,000						142,000
Available for sale securities, purchased						19,800,000
Other than temporary impairment of securities	0	163,000									134,000		29,000
Number of securities in unrealized loss positions	6		7
Fair Value [Abstract]
Less than 12 Months	817,000		941,000	817,000	941,000
12 Months or More	0		0	0	0
Total	817,000		941,000	817,000	941,000
Unrealized Losses [Abstract]
Less than 12 Months	(8,000)		(10,000)	(8,000)	(10,000)
12 Months or More	0		0	0	0
Total	$ (8,000)		$ (10,000)	$ (8,000)	$ (10,000)

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading, purchased during the period.

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NORTHERN STATES FINANCIAL CORP /DE/ 10-Q