Loans (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	$ 71,140	$ 127,217
With no specific allowance recorded, Recorded Investment	48,081	87,591
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	63,797	82,590
With no specific allowance recorded, Interest income recognized	938	1,374
With no specific allowance recorded, Cash basis income recognized	1,375	3,521
With a specific allowance recorded, Unpaid principal balance	18,115	91,049
With a specific allowance recorded, Recorded investment	12,936	65,976
With a specific allowance recorded, Allowance for loan losses allocated	3,024	11,823
With a specific allowance recorded, Average recorded investment	33,680	79,209
With a specific allowance recorded, Interest income recognized	19	981
With a specific allowance recorded, Cash basis income recognized	79	2,090
Total Unpaid Principal Balance	89,255	218,266
Total Recorded Investment	61,017	153,567
Total Average Recorded Investment	97,477		144,977
Total Interest Income, Accrual Method	957		1,778
Total cash basis income recognized	1,454		4,570
Permanent real estate loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	37,662	75,817
With no specific allowance recorded, Recorded Investment	34,467	68,388
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	49,450	63,464
With no specific allowance recorded, Interest income recognized	670	986
With no specific allowance recorded, Cash basis income recognized	846	2,290
With a specific allowance recorded, Unpaid principal balance	10,862	53,839
With a specific allowance recorded, Recorded investment	8,546	46,902
With a specific allowance recorded, Allowance for loan losses allocated	2,380	8,275
With a specific allowance recorded, Average recorded investment	23,655	47,622
With a specific allowance recorded, Interest income recognized	19	929
With a specific allowance recorded, Cash basis income recognized	74	1,840
Construction loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	18,483	19,788
With no specific allowance recorded, Recorded Investment	3,580	12,532
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	6,051	15,396
With no specific allowance recorded, Interest income recognized		284
With no specific allowance recorded, Cash basis income recognized	14	441
With a specific allowance recorded, Unpaid principal balance	6,455	35,759
With a specific allowance recorded, Recorded investment	3,967	18,055
With a specific allowance recorded, Allowance for loan losses allocated	478	3,102
With a specific allowance recorded, Average recorded investment	9,511	24,089
With a specific allowance recorded, Interest income recognized		47
With a specific allowance recorded, Cash basis income recognized	2	221
Consumer loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	10,012	5,021
With no specific allowance recorded, Recorded Investment	8,784	3,216
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	6,555	1,733
With no specific allowance recorded, Interest income recognized	266	62
With no specific allowance recorded, Cash basis income recognized	380	131
With a specific allowance recorded, Unpaid principal balance		570
With a specific allowance recorded, Recorded investment		518
With a specific allowance recorded, Allowance for loan losses allocated		236
With a specific allowance recorded, Average recorded investment	27	130
With a specific allowance recorded, Cash basis income recognized		19
Commercial loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	4,983	26,591
With no specific allowance recorded, Recorded Investment	1,250	3,455
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	1,741	1,997
With no specific allowance recorded, Interest income recognized	2	42
With no specific allowance recorded, Cash basis income recognized	135	659
With a specific allowance recorded, Unpaid principal balance	798	881
With a specific allowance recorded, Recorded investment	423	501
With a specific allowance recorded, Allowance for loan losses allocated	166	210
With a specific allowance recorded, Average recorded investment	487	7,368
With a specific allowance recorded, Interest income recognized		5
With a specific allowance recorded, Cash basis income recognized	3	10
Total Average Recorded Investment		161,799
Total Interest Income, Accrual Method		2,355
Total cash basis income recognized		5,611
One-to four-family residential [Member] | Permanent real estate loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	18,672	32,372
With no specific allowance recorded, Recorded Investment	16,947	28,566
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	22,526	26,016
With no specific allowance recorded, Interest income recognized	613	557
With no specific allowance recorded, Cash basis income recognized	715	868
With a specific allowance recorded, Unpaid principal balance	735	2,487
With a specific allowance recorded, Recorded investment	735	1,721
With a specific allowance recorded, Allowance for loan losses allocated	260	152
With a specific allowance recorded, Average recorded investment	1,242	2,993
With a specific allowance recorded, Cash basis income recognized		35
One-to four-family residential [Member] | Construction loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	17,912	19,081
With no specific allowance recorded, Recorded Investment	3,580	12,532
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	6,051	15,300
With no specific allowance recorded, Interest income recognized		284
With no specific allowance recorded, Cash basis income recognized	14	441
With a specific allowance recorded, Unpaid principal balance	6,455	35,759
With a specific allowance recorded, Recorded investment	3,967	18,055
With a specific allowance recorded, Allowance for loan losses allocated	478	3,102
With a specific allowance recorded, Average recorded investment	9,511	24,089
With a specific allowance recorded, Interest income recognized		47
With a specific allowance recorded, Cash basis income recognized	2	221
Multifamily residential [Member] | Permanent real estate loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	1,173	5,112
With no specific allowance recorded, Recorded Investment	1,078	4,205
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	2,581	3,798
With no specific allowance recorded, Interest income recognized	36
With no specific allowance recorded, Cash basis income recognized	63	218
With a specific allowance recorded, Unpaid principal balance	996	4,077
With a specific allowance recorded, Recorded investment	981	2,387
With a specific allowance recorded, Allowance for loan losses allocated	57	187
With a specific allowance recorded, Average recorded investment	2,390	3,594
With a specific allowance recorded, Interest income recognized		10
With a specific allowance recorded, Cash basis income recognized	17	61
Multi-family and nonresidential [Member] | Construction loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	571	707
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment		96
With a specific allowance recorded, Unpaid principal balance
With a specific allowance recorded, Recorded investment
With a specific allowance recorded, Allowance for loan losses allocated
With a specific allowance recorded, Average recorded investment
With a specific allowance recorded, Interest income recognized
With a specific allowance recorded, Cash basis income recognized
Nonresidential [Member] | Permanent real estate loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	13,240	29,120
With no specific allowance recorded, Recorded Investment	12,638	28,327
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	19,425	26,911
With no specific allowance recorded, Interest income recognized	21	391
With no specific allowance recorded, Cash basis income recognized	68	1,006
With a specific allowance recorded, Unpaid principal balance	5,218	42,201
With a specific allowance recorded, Recorded investment	4,703	38,176
With a specific allowance recorded, Allowance for loan losses allocated	1,336	6,127
With a specific allowance recorded, Average recorded investment	17,420	37,986
With a specific allowance recorded, Interest income recognized	19	919
With a specific allowance recorded, Cash basis income recognized	57	1,569
Land [Member] | Permanent real estate loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	4,577	9,213
With no specific allowance recorded, Recorded Investment	3,804	7,290
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	4,918	6,739
With no specific allowance recorded, Interest income recognized		38
With no specific allowance recorded, Cash basis income recognized		198
With a specific allowance recorded, Unpaid principal balance	3,913	5,074
With a specific allowance recorded, Recorded investment	2,127	4,618
With a specific allowance recorded, Allowance for loan losses allocated	727	1,809
With a specific allowance recorded, Average recorded investment	2,603	3,049
With a specific allowance recorded, Cash basis income recognized		175
Home Equity [Member] | Consumer loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	8,867	4,908
With no specific allowance recorded, Recorded Investment	7,958	3,139
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	5,571	1,620
With no specific allowance recorded, Interest income recognized	265	61
With no specific allowance recorded, Cash basis income recognized	326	124
With a specific allowance recorded, Unpaid principal balance
With a specific allowance recorded, Recorded investment
With a specific allowance recorded, Allowance for loan losses allocated
With a specific allowance recorded, Average recorded investment
With a specific allowance recorded, Interest income recognized
With a specific allowance recorded, Cash basis income recognized
Auto [Member] | Consumer loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	68	80
With no specific allowance recorded, Recorded Investment	44	59
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	52	68
With no specific allowance recorded, Interest income recognized	1	1
With no specific allowance recorded, Cash basis income recognized	6	5
With a specific allowance recorded, Unpaid principal balance
With a specific allowance recorded, Recorded investment
With a specific allowance recorded, Allowance for loan losses allocated
With a specific allowance recorded, Average recorded investment
With a specific allowance recorded, Interest income recognized
With a specific allowance recorded, Cash basis income recognized
Marine [Member]
Investment in loans by portfolio segment and based on impairment
With a specific allowance recorded, Unpaid principal balance
With a specific allowance recorded, Recorded investment
With a specific allowance recorded, Allowance for loan losses allocated
Marine [Member] | Consumer loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	190
With no specific allowance recorded, Recorded Investment	190
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	268
With no specific allowance recorded, Interest income recognized
With no specific allowance recorded, Cash basis income recognized	13
With a specific allowance recorded, Unpaid principal balance		482
With a specific allowance recorded, Recorded investment		482
With a specific allowance recorded, Allowance for loan losses allocated		218
With a specific allowance recorded, Average recorded investment		121
With a specific allowance recorded, Interest income recognized
With a specific allowance recorded, Cash basis income recognized		19
Recreational vehicles [Member] | Consumer loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	887	26
With no specific allowance recorded, Recorded Investment	592	11
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	659	38
With no specific allowance recorded, Cash basis income recognized	35	2
With a specific allowance recorded, Unpaid principal balance		88
With a specific allowance recorded, Recorded investment		36
With a specific allowance recorded, Allowance for loan losses allocated		18
With a specific allowance recorded, Average recorded investment	27	9
With a specific allowance recorded, Interest income recognized
With a specific allowance recorded, Cash basis income recognized
Other [Member] | Consumer loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance		7
With no specific allowance recorded, Recorded Investment		7
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	5	7
With a specific allowance recorded, Unpaid principal balance
With a specific allowance recorded, Recorded investment
With a specific allowance recorded, Allowance for loan losses allocated
With a specific allowance recorded, Average recorded investment
With a specific allowance recorded, Interest income recognized
With a specific allowance recorded, Cash basis income recognized
Secured [Member] | Commercial loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	2,122	3,875
With no specific allowance recorded, Recorded Investment	1,212	3,084
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	1,480	1,627
With no specific allowance recorded, Interest income recognized		35
With no specific allowance recorded, Cash basis income recognized	124	531
With a specific allowance recorded, Unpaid principal balance	798	776
With a specific allowance recorded, Recorded investment	423	427
With a specific allowance recorded, Allowance for loan losses allocated	166	136
With a specific allowance recorded, Average recorded investment	487	6,124
With a specific allowance recorded, Interest income recognized		5
With a specific allowance recorded, Cash basis income recognized	3	10
Unsecured [Member] | Commercial loans [Member]
Investment in loans by portfolio segment and based on impairment
With no specific allowance recorded, Unpaid principal Balance	2,861	22,716
With no specific allowance recorded, Recorded Investment	38	371
With no specific allowance recorded, Allowance for loan losses allocated
With no specific allowance recorded, Average recorded investment	261	370
With no specific allowance recorded, Interest income recognized	2	7
With no specific allowance recorded, Cash basis income recognized	11	128
With a specific allowance recorded, Unpaid principal balance		105
With a specific allowance recorded, Recorded investment		74
With a specific allowance recorded, Allowance for loan losses allocated		74
With a specific allowance recorded, Average recorded investment		1,244
With a specific allowance recorded, Interest income recognized
With a specific allowance recorded, Cash basis income recognized