Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period						$ 8,879	$ 8,522	$ 8,879
Charge-offs							(1,515)	(4,014)
Recoveries							236	402	221
Provisions for (reduction in) loan losses	606	145	527	1,322	1,300	106	751	3,255	2,092
Balance, at the end of the period	7,994		8,522				7,994	8,522	8,879
Other disclosures
Amount of allowance attributed to: Specifically evaluated impaired loans	665						665		47
Amount of allowance attributed to: General portfolio allocation	7,329		8,522				7,329	8,522
Loans individually evaluated for impairment	2,736		6,991				2,736	6,991
Specific reserves to total loans individually evaluated for impairment (as a percent)							24.31%	0.00%
Loans collectively evaluated for impairment	983,458		732,263				983,458	732,263
General reserves to total loans collectively evaluated for impairment (as a percent)							0.75%	1.16%
Total gross loans	986,194		739,254				986,194	739,254
Total allowance to gross loans (as a percent)							0.81%	1.15%
Multi-Family and Non-Owner Occupied Commercial Real Estate Loans
Allowance for Loan Losses
Actual trailing period considered for determination of allowance for loan losses factor							36 months
Trailing period one considered for determination of allowance for loan losses factor							24 months
Trailing period two considered for determination of allowance for loan losses factor							12 months
Annualized trailing period considered for determination of allowance for loan losses factor							6 months
Period considered for comparison of allowance for loan losses factor							10 years
Period considered for comparison of entity's allowance for loan losses factor							15 years
Trailing period considered for comparison of allowance for loan losses factor							12 months
Owner Occupied Commercial Real Estate Loans, Commercial Business Loans and SBA Loans
Allowance for Loan Losses
Actual trailing period considered for determination of allowance for loan losses factor							36 months
Trailing period one considered for determination of allowance for loan losses factor							24 months
Trailing period two considered for determination of allowance for loan losses factor							12 months
Annualized trailing period considered for determination of allowance for loan losses factor							6 months
Period considered for comparison of allowance for loan losses factor							10 years
Period considered for comparison of entity's allowance for loan losses factor							15 years
Trailing period considered for comparison of allowance for loan losses factor							12 months
Single Family and Consumer Loans and Warehouse Repurchase Facilities
Allowance for Loan Losses
Actual trailing period considered for determination of allowance for loan losses factor							36 months
Trailing period one considered for determination of allowance for loan losses factor							24 months
Trailing period two considered for determination of allowance for loan losses factor							12 months
Annualized trailing period considered for determination of allowance for loan losses factor							6 months
Period considered for comparison of allowance for loan losses factor							10 years
Period considered for comparison of entity's allowance for loan losses factor							15 years
Trailing period considered for comparison of allowance for loan losses factor							12 months
Multi-family
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period						2,729	2,281	2,729
Charge-offs								(489)
Provisions for (reduction in) loan losses							(1,136)	41
Balance, at the end of the period	1,145		2,281				1,145	2,281
Other disclosures
Amount of allowance attributed to: General portfolio allocation	1,145		2,281				1,145	2,281
Loans individually evaluated for impairment	266		1,423				266	1,423
Specific reserves to total loans individually evaluated for impairment (as a percent)							0.00%	0.00%
Loans collectively evaluated for impairment	156,158		192,407				156,158	192,407
General reserves to total loans collectively evaluated for impairment (as a percent)							0.73%	1.19%
Total gross loans	156,424		193,830				156,424	193,830
Total allowance to gross loans (as a percent)							0.73%	1.18%
Commercial non-owner occupied
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period						1,580	1,287	1,580
Charge-offs							(88)	(43)
Recoveries							21
Provisions for (reduction in) loan losses							239	(250)
Balance, at the end of the period	1,459		1,287				1,459	1,287
Other disclosures
Amount of allowance attributed to: Specifically evaluated impaired loans									47
Amount of allowance attributed to: General portfolio allocation	1,459		1,287				1,459	1,287
Loans individually evaluated for impairment	670		1,495				670	1,495
Specific reserves to total loans individually evaluated for impairment (as a percent)							0.00%	0.00%
Loans collectively evaluated for impairment	252,739		162,846				252,739	162,846
General reserves to total loans collectively evaluated for impairment (as a percent)							0.58%	0.79%
Total gross loans	253,409		164,341				253,409	164,341
Total allowance to gross loans (as a percent)							0.58%	0.78%
One-to-four family
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period						332	931	332
Charge-offs							(371)	(1,408)
Recoveries							8	142
Provisions for (reduction in) loan losses							294	1,865
Balance, at the end of the period	862		931				862	931
Other disclosures
Amount of allowance attributed to: Specifically evaluated impaired loans	395						395
Amount of allowance attributed to: General portfolio allocation	467		931				467	931
Loans individually evaluated for impairment	948		521				948	521
Specific reserves to total loans individually evaluated for impairment (as a percent)							41.67%	0.00%
Loans collectively evaluated for impairment	96,515		59,506				96,515	59,506
General reserves to total loans collectively evaluated for impairment (as a percent)							0.48%	1.56%
Total gross loans	97,463		60,027				97,463	60,027
Total allowance to gross loans (as a percent)							0.88%	1.55%
Land
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period							39
Charge-offs							(145)	(164)
Recoveries								23
Provisions for (reduction in) loan losses							137	180
Balance, at the end of the period	31		39				31	39
Other disclosures
Amount of allowance attributed to: General portfolio allocation	31		39				31	39
Specific reserves to total loans individually evaluated for impairment (as a percent)							0.00%	0.00%
Loans collectively evaluated for impairment	8,774		6,438				8,774	6,438
General reserves to total loans collectively evaluated for impairment (as a percent)							0.35%	0.61%
Total gross loans	8,774		6,438				8,774	6,438
Total allowance to gross loans (as a percent)							0.35%	0.61%
Commercial owner occupied
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period						1,687	1,119	1,687
Charge-offs							(265)	(307)
Provisions for (reduction in) loan losses							658	(261)
Balance, at the end of the period	1,512		1,119				1,512	1,119
Other disclosures
Amount of allowance attributed to: General portfolio allocation	1,512		1,119				1,512	1,119
Loans individually evaluated for impairment			1,641					1,641
Specific reserves to total loans individually evaluated for impairment (as a percent)							0.00%	0.00%
Loans collectively evaluated for impairment	150,934		150,658				150,934	150,658
General reserves to total loans collectively evaluated for impairment (as a percent)							1.00%	0.74%
Total gross loans	150,934		152,299				150,934	152,299
Total allowance to gross loans (as a percent)							1.00%	0.73%
Commercial and industrial
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period						2,018	1,361	2,018
Charge-offs							(512)	(1,285)
Recoveries							2	9
Provisions for (reduction in) loan losses							459	619
Balance, at the end of the period	1,310		1,361				1,310	1,361
Other disclosures
Amount of allowance attributed to: Specifically evaluated impaired loans	270						270
Amount of allowance attributed to: General portfolio allocation	1,040		1,361				1,040	1,361
Loans individually evaluated for impairment	593		1,138				593	1,138
Specific reserves to total loans individually evaluated for impairment (as a percent)							45.53%	0.00%
Loans collectively evaluated for impairment	114,761		85,546				114,761	85,546
General reserves to total loans collectively evaluated for impairment (as a percent)							0.91%	1.59%
Total gross loans	115,354		86,684				115,354	86,684
Total allowance to gross loans (as a percent)							1.14%	1.57%
Warehouse
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period						338	1,347	338
Provisions for (reduction in) loan losses							197	1,009
Balance, at the end of the period	1,544		1,347				1,544	1,347
Other disclosures
Amount of allowance attributed to: General portfolio allocation	1,544		1,347				1,544	1,347
Specific reserves to total loans individually evaluated for impairment (as a percent)							0.00%	0.00%
Loans collectively evaluated for impairment	195,761		67,518				195,761	67,518
General reserves to total loans collectively evaluated for impairment (as a percent)							0.79%	2.00%
Total gross loans	195,761		67,518				195,761	67,518
Total allowance to gross loans (as a percent)							0.79%	2.00%
SBA
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period						145	80	145
Charge-offs							(132)	(90)
Recoveries							163	211
Provisions for (reduction in) loan losses							(32)	(186)
Balance, at the end of the period	79		80				79	80
Other disclosures
Amount of allowance attributed to: General portfolio allocation	79		80				79	80
Loans individually evaluated for impairment	259		773				259	773
Specific reserves to total loans individually evaluated for impairment (as a percent)							0.00%	0.00%
Loans collectively evaluated for impairment	6,623		3,954				6,623	3,954
General reserves to total loans collectively evaluated for impairment (as a percent)							1.19%	2.02%
Total gross loans	6,882		4,727				6,882	4,727
Total allowance to gross loans (as a percent)							1.15%	1.69%
Other loans
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period						50	77	50
Charge-offs							(2)	(228)
Recoveries							42	17
Provisions for (reduction in) loan losses							(65)	238
Balance, at the end of the period	52		77				52	77
Other disclosures
Amount of allowance attributed to: General portfolio allocation	52		77				52	77
Specific reserves to total loans individually evaluated for impairment (as a percent)							0.00%	0.00%
Loans collectively evaluated for impairment	1,193		3,390				1,193	3,390
General reserves to total loans collectively evaluated for impairment (as a percent)							4.36%	2.27%
Total gross loans	$ 1,193		$ 3,390				$ 1,193	$ 3,390
Total allowance to gross loans (as a percent)							4.36%	2.27%