Loans and Allowance for Loan Losses - Impaired Loans (Details) (USD $)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 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	3,749,000	3,749,000		4,101,000
Total impaired loans, recorded investment	68,334,000	68,334,000		77,896,000
Total impaired loans, unpaid principal balance	84,704,000	84,704,000		96,169,000
Total impaired loans, average recorded investment	70,633,000	74,856,000	73,158,000	71,967,000
Total impaired loans, interest income recognized	188,000	898,000	1,246,000	609,000
Allowance for loan losses	28,797,000	28,797,000		32,848,000	[1]
Outstanding balance of purchased impaired loans	346,270	346,270
Allowance for Purchased Impaired Loans Excess Credit Discount
Impaired Loans
Allowance for loan losses	19,441	19,441		49,000
Real Estate Loans | Construction Loans
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	18,135,000	18,135,000		28,067,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	27,216,000	27,216,000		40,045,000
Impaired loans without a related allowance for loan losses, average recorded investment	21,072,000	23,311,000	22,020,000	22,835,000
Impaired loans without a related allowance for loan losses, interest income recognized	36,000	150,000	298,000	156,000
Impaired loans with a related allowance for loan losses, recorded investment	2,477,000	2,477,000		1,011,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	4,269,000	4,269,000		1,011,000
Impaired loans with a related allowance for loan losses, related allowance	325,000	325,000		570,000
Impaired loans with a related allowance for loan losses, average recorded investment	2,205,000	1,406,000	8,740,000	7,181,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	0	148,000	52,000
Total impaired loans, recorded investment	20,612,000	20,612,000		29,078,000
Total impaired loans, unpaid principal balance	31,485,000	31,485,000		41,056,000
Total impaired loans, average recorded investment	23,277,000	24,717,000	30,760,000	30,016,000
Total impaired loans, interest income recognized	36,000	150,000	446,000	208,000
Real Estate Loans | Owner Occupied
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	13,016,000	13,016,000		17,586,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	14,637,000	14,637,000		20,070,000
Impaired loans without a related allowance for loan losses, average recorded investment	14,112,000	16,228,000	10,451,000	10,104,000
Impaired loans without a related allowance for loan losses, interest income recognized	22,000	308,000	259,000	117,000
Impaired loans with a related allowance for loan losses, recorded investment	8,937,000	8,937,000		6,459,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	9,945,000	9,945,000		6,533,000
Impaired loans with a related allowance for loan losses, related allowance	996,000	996,000		585,000
Impaired loans with a related allowance for loan losses, average recorded investment	8,877,000	7,631,000	5,891,000	6,498,000
Impaired loans with a related allowance for loan losses, interest income recognized	69,000	69,000	114,000	61,000
Total impaired loans, recorded investment	21,953,000	21,953,000		24,045,000
Total impaired loans, unpaid principal balance	24,582,000	24,582,000		26,603,000
Total impaired loans, average recorded investment	22,989,000	23,859,000	16,342,000	16,602,000
Total impaired loans, interest income recognized	91,000	377,000	373,000	178,000
Real Estate Loans | Non-owner Occupied
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	5,190,000	5,190,000		8,639,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	6,544,000	6,544,000		11,255,000
Impaired loans without a related allowance for loan losses, average recorded investment	7,828,000	10,150,000	6,294,000	6,640,000
Impaired loans without a related allowance for loan losses, interest income recognized	9,000	10,000	63,000	26,000
Impaired loans with a related allowance for loan losses, recorded investment	1,371,000	1,371,000		975,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	1,371,000	1,371,000		1,363,000
Impaired loans with a related allowance for loan losses, related allowance	97,000	97,000		143,000
Impaired loans with a related allowance for loan losses, average recorded investment	1,028,000	727,000	4,993,000	3,866,000
Impaired loans with a related allowance for loan losses, interest income recognized	16,000	16,000	88,000	48,000
Total impaired loans, recorded investment	6,561,000	6,561,000		9,614,000
Total impaired loans, unpaid principal balance	7,915,000	7,915,000		12,618,000
Total impaired loans, average recorded investment	8,856,000	10,877,000	11,287,000	10,506,000
Total impaired loans, interest income recognized	25,000	26,000	151,000	74,000
Real Estate Loans | One to Four Family
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	4,279,000	4,279,000		3,843,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	4,720,000	4,720,000		4,285,000
Impaired loans without a related allowance for loan losses, average recorded investment	3,078,000	3,413,000	2,484,000	2,372,000
Impaired loans without a related allowance for loan losses, interest income recognized	5,000	29,000	42,000	26,000
Impaired loans with a related allowance for loan losses, recorded investment	2,889,000	2,889,000		498,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	2,919,000	2,919,000		517,000
Impaired loans with a related allowance for loan losses, related allowance	222,000	222,000		45,000
Impaired loans with a related allowance for loan losses, average recorded investment	547,000	421,000	2,331,000	2,601,000
Impaired loans with a related allowance for loan losses, interest income recognized	3,000	3,000	34,000	14,000
Total impaired loans, recorded investment	7,168,000	7,168,000		4,341,000
Total impaired loans, unpaid principal balance	7,639,000	7,639,000		4,802,000
Total impaired loans, average recorded investment	3,625,000	3,834,000	4,815,000	4,973,000
Total impaired loans, interest income recognized	8,000	32,000	76,000	40,000
Real Estate Loans | Multifamily
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	707,000	707,000		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	719,000	702,000	302,000	299,000
Impaired loans without a related allowance for loan losses, interest income recognized	0	4,000	5,000	3,000
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	43,000	453,000	447,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	7,000	16,000	7,000
Total impaired loans, recorded investment	707,000	707,000		595,000
Total impaired loans, unpaid principal balance	884,000	884,000		628,000
Total impaired loans, average recorded investment	719,000	745,000	755,000	746,000
Total impaired loans, interest income recognized	0	11,000	21,000	10,000
Real Estate Loans | Home Equity Lines of Credit
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	1,234,000	1,234,000		525,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	1,476,000	1,476,000		694,000
Impaired loans without a related allowance for loan losses, average recorded investment	1,236,000	1,154,000	813,000	707,000
Impaired loans without a related allowance for loan losses, interest income recognized	0	8,000	9,000	5,000
Impaired loans with a related allowance for loan losses, recorded investment	117,000	117,000		403,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	130,000	130,000		412,000
Impaired loans with a related allowance for loan losses, related allowance	47,000	47,000		112,000
Impaired loans with a related allowance for loan losses, average recorded investment	118,000	159,000	720,000	618,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	0	12,000	9,000
Total impaired loans, recorded investment	1,351,000	1,351,000		928,000
Total impaired loans, unpaid principal balance	1,606,000	1,606,000		1,106,000
Total impaired loans, average recorded investment	1,354,000	1,313,000	1,533,000	1,325,000
Total impaired loans, interest income recognized	0	8,000	21,000	14,000
Commercial
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	6,727,000	6,727,000		6,381,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	7,246,000	7,246,000		6,436,000
Impaired loans without a related allowance for loan losses, average recorded investment	6,534,000	6,326,000	2,319,000	2,561,000
Impaired loans without a related allowance for loan losses, interest income recognized	28,000	130,000	59,000	34,000
Impaired loans with a related allowance for loan losses, recorded investment	3,031,000	3,031,000		2,914,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	3,123,000	3,123,000		2,920,000
Impaired loans with a related allowance for loan losses, related allowance	1,838,000	1,838,000		2,511,000
Impaired loans with a related allowance for loan losses, average recorded investment	3,115,000	3,090,000	5,218,000	5,113,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	164,000	93,000	51,000
Total impaired loans, recorded investment	9,758,000	9,758,000		9,295,000
Total impaired loans, unpaid principal balance	10,369,000	10,369,000		9,356,000
Total impaired loans, average recorded investment	9,649,000	9,416,000	7,537,000	7,674,000
Total impaired loans, interest income recognized	28,000	294,000	152,000	85,000
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	224,000	224,000		0
Impaired loans with a related allowance for loan losses, unpaid principal balance	224,000	224,000		0
Impaired loans with a related allowance for loan losses, related allowance	224,000	224,000		0
Impaired loans with a related allowance for loan losses, average recorded investment	164,000	95,000	129,000	125,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	0	6,000	0
Total impaired loans, recorded investment	224,000	224,000		0
Total impaired loans, unpaid principal balance	224,000	224,000		0
Total impaired loans, average recorded investment	164,000	95,000	129,000	125,000
Total impaired loans, interest income recognized	$ 0	$ 0	$ 6,000	$ 0

[1] Derived from audited consolidated financial statements