Loans, Nonaccrual and past due loans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Past Due and nonaccrual [Line Items]
Nonaccrual loans	$ 3,530,000		$ 3,530,000		$ 5,218,000
30 to 59 days past due	543,000		543,000		6,072,000
60 to 89 days past due	521,000		521,000		1,244,000
90 days or greater past due	2,594,000		2,594,000		3,446,000
Recorded investment 90 days or greater and accruing	0		0		0
Total past due	3,658,000		3,658,000		10,762,000
Current	308,054,000		308,054,000		291,547,000
Total loans	311,712,000		311,712,000		302,309,000
Loans	311,712,000		311,712,000		302,309,000
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded	6,490,000		6,490,000		6,687,000
With related allowance recorded	6,867,000		6,867,000		6,932,000
Total investments	13,357,000		13,357,000		13,619,000
With no related allowance unpaid principal balance	7,183,000		7,183,000		6,734,000
With related allowance unpaid principal balance	6,925,000		6,925,000		7,138,000
Total unpaid principal balance	14,108,000		14,108,000		13,872,000
Related allowance	1,530,000		1,530,000		1,254,000
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	13,833,000	11,212,000	14,443,000	11,222,000
Interest income recognized	135,000	86,000	437,000	276,000
Impaired loans, interest income forgone			191,000	276,000
Restructured loans by modification [Abstract]
Number of contracts	2	1	16	2
Rate modifications	0	0	121,000	0
Term Modifications	0	0	0	0
Payment Modifications	0	0	0	0
Combination Modifications	314,000	997,000	1,379,000	1,041,000
Total Modifications	314,000	997,000	1,500,000	1,041,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment During Period	3,784,000		3,865,000
Number of days past due to be considered in default			P30D
One-to Four- Family [Member]
Past Due and nonaccrual [Line Items]
Nonaccrual loans	1,358,000		1,358,000		3,124,000
30 to 59 days past due	0		0		4,321,000
60 to 89 days past due	411,000		411,000		935,000
90 days or greater past due	1,592,000		1,592,000		2,683,000
Recorded investment 90 days or greater and accruing	0		0		0
Total past due	2,003,000		2,003,000		7,939,000
Current	92,338,000		92,338,000		88,366,000
Total loans	94,341,000		94,341,000		96,305,000
Loans	94,341,000		94,341,000		96,305,000
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded	2,172,000		2,172,000		3,104,000
With related allowance recorded	4,594,000		4,594,000		5,156,000
Total investments	6,766,000		6,766,000		8,260,000
With no related allowance unpaid principal balance	2,329,000		2,329,000		3,104,000
With related allowance unpaid principal balance	4,611,000		4,611,000		5,280,000
Total unpaid principal balance	6,940,000		6,940,000		8,384,000
Related allowance	837,000		837,000		541,000
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	7,040,000	6,095,000	7,962,000	5,748,000
Interest income recognized	65,000	49,000	213,000	146,000
Restructured loans by modification [Abstract]
Number of contracts	1	0	5	0
Rate modifications	0	0	0	0
Term Modifications	0	0	0	0
Payment Modifications	0	0	0	0
Combination Modifications	197,000	0	561,000	0
Total Modifications	197,000	0	561,000	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment During Period	1,246,000		1,246,000
Home Equity [Member]
Past Due and nonaccrual [Line Items]
Nonaccrual loans	404,000		404,000		731,000
30 to 59 days past due	324,000		324,000		583,000
60 to 89 days past due	108,000		108,000		176,000
90 days or greater past due	358,000		358,000		683,000
Recorded investment 90 days or greater and accruing	0		0		0
Total past due	790,000		790,000		1,442,000
Current	35,093,000		35,093,000		38,214,000
Total loans	35,883,000		35,883,000		39,656,000
Loans	35,883,000		35,883,000		39,656,000
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded	935,000		935,000		773,000
With related allowance recorded	859,000		859,000		1,011,000
Total investments	1,794,000		1,794,000		1,784,000
With no related allowance unpaid principal balance	1,252,000		1,252,000		773,000
With related allowance unpaid principal balance	859,000		859,000		1,038,000
Total unpaid principal balance	2,111,000		2,111,000		1,811,000
Related allowance	280,000		280,000		447,000
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	1,923,000	1,488,000	1,895,000	1,433,000
Interest income recognized	18,000	8,000	60,000	31,000
Restructured loans by modification [Abstract]
Number of contracts	1	0	2	0
Rate modifications	0	0	0	0
Term Modifications	0	0	0	0
Payment Modifications	0	0	0	0
Combination Modifications	117,000		166,000
Total Modifications	117,000	0	166,000	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment During Period	215,000		215,000
Commercial and Multifamily [Member]
Past Due and nonaccrual [Line Items]
Nonaccrual loans	1,124,000		1,124,000		1,299,000
30 to 59 days past due	0		0		0
60 to 89 days past due	0		0		0
90 days or greater past due	0		0		0
Recorded investment 90 days or greater and accruing	0		0		0
Total past due	0		0		0
Current	119,938,000		119,938,000		106,016,000
Total loans	119,938,000		119,938,000		106,016,000
Loans	119,938,000		119,938,000		106,016,000
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded	1,904,000		1,904,000		1,784,000
With related allowance recorded	244,000		244,000		219,000
Total investments	2,148,000		2,148,000		2,003,000
With no related allowance unpaid principal balance	1,904,000		1,904,000		1,784,000
With related allowance unpaid principal balance	244,000		244,000		219,000
Total unpaid principal balance	2,148,000		2,148,000		2,003,000
Related allowance	74,000		74,000		38,000
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	2,183,000	3,142,000	2,157,000	3,518,000
Interest income recognized	30,000	22,000	67,000	72,000
Restructured loans by modification [Abstract]
Number of contracts	0	1	2	1
Rate modifications	0	0	0	0
Term Modifications	0	0	0	0
Payment Modifications	0	0	0	0
Combination Modifications	0	997,000	426,000	997,000
Total Modifications	0	997,000	426,000	997,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment During Period	1,366,000		1,366,000
Construction and Land [Member]
Past Due and nonaccrual [Line Items]
Nonaccrual loans	550,000		550,000		0
30 to 59 days past due	0		0		0
60 to 89 days past due	0		0		123,000
90 days or greater past due	551,000		551,000		80,000
Recorded investment 90 days or greater and accruing	0		0		0
Total past due	551,000		551,000		203,000
Current	20,143,000		20,143,000		17,602,000
Total loans	20,694,000		20,694,000		17,805,000
Loans	20,694,000		20,694,000		17,805,000
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded	552,000		552,000		779,000
With related allowance recorded	101,000		101,000		123,000
Total investments	653,000		653,000		902,000
With no related allowance unpaid principal balance	730,000		730,000		785,000
With related allowance unpaid principal balance	102,000		102,000		178,000
Total unpaid principal balance	832,000		832,000		963,000
Related allowance	25,000		25,000		37,000
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	735,000	0	794,000	0
Interest income recognized	1,000	0	25,000	0
Restructured loans by modification [Abstract]
Number of contracts	0	0	2	0
Rate modifications	0	0	0	0
Term Modifications	0	0	0	0
Payment Modifications	0	0	0	0
Combination Modifications	0	0	26,000	0
Total Modifications	0	0	26,000	0
Manufactured Homes [Member]
Past Due and nonaccrual [Line Items]
30 to 59 days past due	76,000		76,000		327,000
60 to 89 days past due	0		0		7,000
90 days or greater past due	0		0		0
Recorded investment 90 days or greater and accruing	0		0		0
Total past due	76,000		76,000		334,000
Current	16,934,000		16,934,000		18,110,000
Total loans	17,010,000		17,010,000		18,444,000
Loans	17,010,000		17,010,000		18,444,000
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded	68,000		68,000		0
With related allowance recorded	595,000		595,000		122,000
Total investments	663,000		663,000		122,000
With no related allowance unpaid principal balance	68,000		68,000		0
With related allowance unpaid principal balance	595,000		595,000		122,000
Total unpaid principal balance	663,000		663,000		122,000
Related allowance	120,000		120,000		11,000
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	718,000	158,000	615,000	144,000
Interest income recognized	11,000	3,000	36,000	10,000
Restructured loans by modification [Abstract]
Number of contracts	0	0	0	0
Rate modifications	0	0	0	0
Term Modifications	0	0	0	0
Payment Modifications	0	0	0	0
Combination Modifications	0	0	0	0
Total Modifications	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment During Period	390,000		471,000
Other Consumer [Member]
Past Due and nonaccrual [Line Items]
Nonaccrual loans	3,000		3,000		64,000
30 to 59 days past due	113,000		113,000		172,000
60 to 89 days past due	2,000		2,000		3,000
90 days or greater past due	3,000		3,000		0
Recorded investment 90 days or greater and accruing	0		0		0
Total past due	118,000		118,000		175,000
Current	8,967,000		8,967,000		10,745,000
Total loans	9,085,000		9,085,000		10,920,000
Loans	9,085,000		9,085,000		10,920,000
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded	13,000		13,000		14,000
With related allowance recorded	84,000		84,000		87,000
Total investments	97,000		97,000		101,000
With no related allowance unpaid principal balance	54,000		54,000		55,000
With related allowance unpaid principal balance	84,000		84,000		87,000
Total unpaid principal balance	138,000		138,000		142,000
Related allowance	41,000		41,000		48,000
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	134,000	85,000	115,000	104,000
Interest income recognized	3,000	3,000	7,000	7,000
Restructured loans by modification [Abstract]
Number of contracts	0	0	2	1
Rate modifications	0	0	0	0
Term Modifications	0	0	0	0
Payment Modifications	0	0	0	0
Combination Modifications	0	0	14,000	44,000
Total Modifications	0	0	14,000	44,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment During Period	27,000		27,000
Commercial Business [Member]
Past Due and nonaccrual [Line Items]
Nonaccrual loans	91,000		91,000		0
30 to 59 days past due	30,000		30,000		669,000
60 to 89 days past due	0		0		0
90 days or greater past due	90,000		90,000		0
Recorded investment 90 days or greater and accruing	0		0		0
Total past due	120,000		120,000		669,000
Current	14,641,000		14,641,000		12,494,000
Total loans	14,761,000		14,761,000		13,163,000
Loans	14,761,000		14,761,000		13,163,000
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded	846,000		846,000		233,000
With related allowance recorded	390,000		390,000		214,000
Total investments	1,236,000		1,236,000		447,000
With no related allowance unpaid principal balance	846,000		846,000		233,000
With related allowance unpaid principal balance	430,000		430,000		214,000
Total unpaid principal balance	1,276,000		1,276,000		447,000
Related allowance	153,000		153,000		132,000
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	1,101,000	245,000	905,000	274,000
Interest income recognized	7,000	1,000	29,000	10,000
Restructured loans by modification [Abstract]
Number of contracts	0	0	3	0
Rate modifications	0	0	121,000	0
Term Modifications	0	0	0	0
Payment Modifications	0	0	0	0
Combination Modifications	0	0	186,000	0
Total Modifications	0	0	307,000	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment During Period	540,000		540,000
Real Estate Loans [Member]
Restructured loans by modification [Abstract]
Number of mortgages over 90 days past due and considered nonaccrual status	1		1
Performing [Member]
Past Due and nonaccrual [Line Items]
Total loans	307,368,000		307,368,000		295,672,000
Loans	307,368,000		307,368,000		295,672,000
Performing [Member] | One-to Four- Family [Member]
Past Due and nonaccrual [Line Items]
Total loans	92,934,000		92,934,000		91,904,000
Loans	92,934,000		92,934,000		91,904,000
Performing [Member] | Home Equity [Member]
Past Due and nonaccrual [Line Items]
Total loans	35,093,000		35,093,000		38,783,000
Loans	35,093,000		35,093,000		38,783,000
Performing [Member] | Commercial and Multifamily [Member]
Past Due and nonaccrual [Line Items]
Total loans	118,572,000		118,572,000		104,797,000
Loans	118,572,000		118,572,000		104,797,000
Performing [Member] | Construction and Land [Member]
Past Due and nonaccrual [Line Items]
Total loans	20,144,000		20,144,000		17,725,000
Loans	20,144,000		20,144,000		17,725,000
Performing [Member] | Manufactured Homes [Member]
Past Due and nonaccrual [Line Items]
Total loans	16,991,000		16,991,000		18,444,000
Loans	16,991,000		16,991,000		18,444,000
Performing [Member] | Other Consumer [Member]
Past Due and nonaccrual [Line Items]
Total loans	9,082,000		9,082,000		10,856,000
Loans	9,082,000		9,082,000		10,856,000
Performing [Member] | Commercial Business [Member]
Past Due and nonaccrual [Line Items]
Total loans	14,552,000		14,552,000		13,163,000
Loans	14,552,000		14,552,000		13,163,000
Nonperforming [Member]
Past Due and nonaccrual [Line Items]
Total loans	4,344,000		4,344,000		6,637,000
Loans	4,344,000		4,344,000		6,637,000
Nonperforming [Member] | One-to Four- Family [Member]
Past Due and nonaccrual [Line Items]
Total loans	1,407,000		1,407,000		4,401,000
Loans	1,407,000		1,407,000		4,401,000
Nonperforming [Member] | Home Equity [Member]
Past Due and nonaccrual [Line Items]
Total loans	790,000		790,000		873,000
Loans	790,000		790,000		873,000
Nonperforming [Member] | Commercial and Multifamily [Member]
Past Due and nonaccrual [Line Items]
Total loans	1,366,000		1,366,000		1,219,000
Loans	1,366,000		1,366,000		1,219,000
Nonperforming [Member] | Construction and Land [Member]
Past Due and nonaccrual [Line Items]
Total loans	550,000		550,000		80,000
Loans	550,000		550,000		80,000
Nonperforming [Member] | Manufactured Homes [Member]
Past Due and nonaccrual [Line Items]
Total loans	19,000		19,000		0
Loans	19,000		19,000		0
Nonperforming [Member] | Other Consumer [Member]
Past Due and nonaccrual [Line Items]
Total loans	3,000		3,000		64,000
Loans	3,000		3,000		64,000
Nonperforming [Member] | Commercial Business [Member]
Past Due and nonaccrual [Line Items]
Total loans	209,000		209,000		0
Loans	209,000		209,000		0
With a Related Allowance Recorded [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	7,708,000	6,104,000	7,700,000	6,680,000
Interest income recognized	67,000	15,000	221,000	72,000
With a Related Allowance Recorded [Member] | One-to Four- Family [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	5,132,000	3,658,000	5,268,000	3,441,000
Interest income recognized	37,000	5,000	129,000	35,000
With a Related Allowance Recorded [Member] | Home Equity [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	1,141,000	865,000	1,146,000	808,000
Interest income recognized	9,000	3,000	28,000	11,000
With a Related Allowance Recorded [Member] | Commercial and Multifamily [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	245,000	1,227,000	284,000	2,109,000
Interest income recognized	4,000	2,000	7,000	4,000
With a Related Allowance Recorded [Member] | Construction and Land [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	161,000	0	131,000	0
Interest income recognized	1,000	0	4,000	0
With a Related Allowance Recorded [Member] | Manufactured Homes [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	648,000	145,000	554,000	105,000
Interest income recognized	10,000	2,000	32,000	8,000
With a Related Allowance Recorded [Member] | Other Consumer [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	127,000	46,000	101,000	49,000
Interest income recognized	2,000	2,000	5,000	5,000
With a Related Allowance Recorded [Member] | Commercial Business [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	255,000	163,000	217,000	168,000
Interest income recognized	4,000	1,000	16,000	9,000
With No Related Allowance Recorded [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	6,126,000	5,109,000	6,743,000	4,541,000
Interest income recognized	68,000	71,000	216,000	204,000
With No Related Allowance Recorded [Member] | One-to Four- Family [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	1,908,000	2,437,000	2,694,000	2,307,000
Interest income recognized	28,000	44,000	84,000	111,000
With No Related Allowance Recorded [Member] | Home Equity [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	783,000	623,000	749,000	625,000
Interest income recognized	9,000	5,000	32,000	20,000
With No Related Allowance Recorded [Member] | Commercial and Multifamily [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	1,938,000	1,915,000	1,874,000	1,409,000
Interest income recognized	26,000	20,000	60,000	68,000
With No Related Allowance Recorded [Member] | Construction and Land [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	574,000	0	663,000	0
Interest income recognized	0	0	21,000	0
With No Related Allowance Recorded [Member] | Manufactured Homes [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	70,000	13,000	62,000	39,000
Interest income recognized	1,000	1,000	4,000	2,000
With No Related Allowance Recorded [Member] | Other Consumer [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	8,000	39,000	14,000	55,000
Interest income recognized	1,000	1,000	2,000	2,000
With No Related Allowance Recorded [Member] | Commercial Business [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	847,000	82,000	688,000	106,000
Interest income recognized	$ 3,000	$ 0	$ 13,000	$ 1,000