Loans and Allowance for Loan Losses - Impaired Loans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Impaired Loans
Theshold for individual impairment evaluation			$ 250,000
Impaired loans with a related allowance for loan losses, related allowance	3,791,000		3,791,000		4,101,000
Total impaired loans, recorded investment	58,122,000		58,122,000		77,896,000
Total impaired loans, unpaid principal balance	62,043,000		62,043,000		96,169,000
Total impaired loans, average recorded investment	59,825,000	63,818,000	69,869,000	84,038,000
Total impaired loans, interest income recognized	273,000	319,000	1,169,000	723,000
Allowance for loan losses	27,231,000		27,231,000		32,848,000	[1]
Outstanding balance of purchased impaired loans	380,887		380,887
Allowance for Purchased Impaired Loans Excess Credit Discount
Impaired Loans
Allowance for loan losses	15,000		15,000		49,000
Real Estate Loans | Construction Loans
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	13,376,000		13,376,000		28,067,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	14,563,000		14,563,000		40,045,000
Impaired loans without a related allowance for loan losses, average recorded investment	14,694,000	22,835,000	20,382,000	26,288,000
Impaired loans without a related allowance for loan losses, interest income recognized	125,000	81,000	275,000	139,000
Impaired loans with a related allowance for loan losses, recorded investment	4,649,000		4,649,000		1,011,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	5,382,000		5,382,000		1,011,000
Impaired loans with a related allowance for loan losses, related allowance	1,249,000		1,249,000		570,000
Impaired loans with a related allowance for loan losses, average recorded investment	4,106,000	9,159,000	2,379,000	8,740,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	2,000	0	5,000
Total impaired loans, recorded investment	18,025,000		18,025,000		29,078,000
Total impaired loans, unpaid principal balance	19,945,000		19,945,000		41,056,000
Total impaired loans, average recorded investment	18,800,000	31,994,000	22,761,000	35,028,000
Total impaired loans, interest income recognized	125,000	83,000	275,000	144,000
Real Estate Loans | Owner Occupied
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	14,056,000		14,056,000		17,586,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	14,756,000		14,756,000		20,070,000
Impaired loans without a related allowance for loan losses, average recorded investment	13,840,000	10,104,000	15,594,000	13,166,000
Impaired loans without a related allowance for loan losses, interest income recognized	23,000	88,000	332,000	175,000
Impaired loans with a related allowance for loan losses, recorded investment	5,212,000		5,212,000		6,459,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	5,220,000		5,220,000		6,533,000
Impaired loans with a related allowance for loan losses, related allowance	279,000		279,000		585,000
Impaired loans with a related allowance for loan losses, average recorded investment	6,154,000	3,209,000	6,910,000	5,891,000
Impaired loans with a related allowance for loan losses, interest income recognized	66,000	7,000	134,000	22,000
Total impaired loans, recorded investment	19,268,000		19,268,000		24,045,000
Total impaired loans, unpaid principal balance	19,976,000		19,976,000		26,603,000
Total impaired loans, average recorded investment	19,994,000	13,313,000	22,504,000	19,057,000
Total impaired loans, interest income recognized	89,000	95,000	466,000	197,000
Real Estate Loans | Non-owner Occupied
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	3,506,000		3,506,000		8,639,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	3,893,000		3,893,000		11,255,000
Impaired loans without a related allowance for loan losses, average recorded investment	4,017,000	6,640,000	8,193,000	8,591,000
Impaired loans without a related allowance for loan losses, interest income recognized	29,000	59,000	39,000	155,000
Impaired loans with a related allowance for loan losses, recorded investment	4,029,000		4,029,000		975,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	4,300,000		4,300,000		1,363,000
Impaired loans with a related allowance for loan losses, related allowance	476,000		476,000		143,000
Impaired loans with a related allowance for loan losses, average recorded investment	3,491,000	2,517,000	1,768,000	4,994,000
Impaired loans with a related allowance for loan losses, interest income recognized	26,000	0	42,000	0
Total impaired loans, recorded investment	7,535,000		7,535,000		9,614,000
Total impaired loans, unpaid principal balance	8,193,000		8,193,000		12,618,000
Total impaired loans, average recorded investment	7,508,000	9,157,000	9,961,000	13,585,000
Total impaired loans, interest income recognized	55,000	59,000	81,000	155,000
Real Estate Loans | One to Four Family
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	968,000		968,000		3,843,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	991,000		991,000		4,285,000
Impaired loans without a related allowance for loan losses, average recorded investment	1,432,000	2,372,000	2,680,000	2,851,000
Impaired loans without a related allowance for loan losses, interest income recognized	0	14,000	29,000	24,000
Impaired loans with a related allowance for loan losses, recorded investment	903,000		903,000		498,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	919,000		919,000		517,000
Impaired loans with a related allowance for loan losses, related allowance	155,000		155,000		45,000
Impaired loans with a related allowance for loan losses, average recorded investment	449,000	1,010,000	411,000	2,331,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	2,000	3,000	6,000
Total impaired loans, recorded investment	1,871,000		1,871,000		4,341,000
Total impaired loans, unpaid principal balance	1,910,000		1,910,000		4,802,000
Total impaired loans, average recorded investment	1,881,000	3,382,000	3,091,000	5,182,000
Total impaired loans, interest income recognized	0	16,000	32,000	30,000
Real Estate Loans | Multifamily
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	701,000		701,000		295,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	884,000		884,000		309,000
Impaired loans without a related allowance for loan losses, average recorded investment	703,000	299,000	702,000	304,000
Impaired loans without a related allowance for loan losses, interest income recognized	4,000	0	7,000	0
Impaired loans with a related allowance for loan losses, recorded investment	0		0		300,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	0		0		319,000
Impaired loans with a related allowance for loan losses, related allowance	0		0		135,000
Impaired loans with a related allowance for loan losses, average recorded investment	0	460,000	30,000	454,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	0	7,000	0
Total impaired loans, recorded investment	701,000		701,000		595,000
Total impaired loans, unpaid principal balance	884,000		884,000		628,000
Total impaired loans, average recorded investment	703,000	759,000	732,000	758,000
Total impaired loans, interest income recognized	4,000	0	14,000	0
Real Estate Loans | Home Equity Lines of Credit
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	1,706,000		1,706,000		525,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	1,767,000		1,767,000		694,000
Impaired loans without a related allowance for loan losses, average recorded investment	1,588,000	707,000	1,320,000	725,000
Impaired loans without a related allowance for loan losses, interest income recognized	0	0	7,000	0
Impaired loans with a related allowance for loan losses, recorded investment	0		0		403,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	0		0		412,000
Impaired loans with a related allowance for loan losses, related allowance	0		0		112,000
Impaired loans with a related allowance for loan losses, average recorded investment	29,000	749,000	111,000	720,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	0	0	0
Total impaired loans, recorded investment	1,706,000		1,706,000		928,000
Total impaired loans, unpaid principal balance	1,767,000		1,767,000		1,106,000
Total impaired loans, average recorded investment	1,617,000	1,456,000	1,431,000	1,445,000
Total impaired loans, interest income recognized	0	0	7,000	0
Commercial
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	6,226,000		6,226,000		6,381,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	6,432,000		6,432,000		6,436,000
Impaired loans without a related allowance for loan losses, average recorded investment	6,403,000	2,560,000	6,316,000	3,636,000
Impaired loans without a related allowance for loan losses, interest income recognized	0	42,000	130,000	126,000
Impaired loans with a related allowance for loan losses, recorded investment	2,790,000		2,790,000		2,914,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	2,936,000		2,936,000		2,920,000
Impaired loans with a related allowance for loan losses, related allowance	1,632,000		1,632,000		2,511,000
Impaired loans with a related allowance for loan losses, average recorded investment	2,865,000	1,067,000	3,006,000	5,218,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	24,000	164,000	71,000
Total impaired loans, recorded investment	9,016,000		9,016,000		9,295,000
Total impaired loans, unpaid principal balance	9,368,000		9,368,000		9,356,000
Total impaired loans, average recorded investment	9,268,000	3,627,000	9,322,000	8,854,000
Total impaired loans, interest income recognized	0	66,000	294,000	197,000
Consumer and other
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	0		0		0
Impaired loans without a related allowance for loan losses, unpaid principal balance	0		0		0
Impaired loans without a related allowance for loan losses, average recorded investment	0	0	0	0
Impaired loans without a related allowance for loan losses, interest income recognized	0	0	0	0
Impaired loans with a related allowance for loan losses, recorded investment	0		0		0
Impaired loans with a related allowance for loan losses, unpaid principal balance	0		0		0
Impaired loans with a related allowance for loan losses, related allowance	0		0		0
Impaired loans with a related allowance for loan losses, average recorded investment	54,000	130,000	67,000	129,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	0	0	0
Total impaired loans, recorded investment	0		0		0
Total impaired loans, unpaid principal balance	0		0		0
Total impaired loans, average recorded investment	54,000	130,000	67,000	129,000
Total impaired loans, interest income recognized	$ 0	$ 0	$ 0	$ 0

[1] Derived from audited consolidated financial statements