Loans and Allowance for Loan Losses - Impaired Loans (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Impaired Loans
Potential problem loans identified as impaired	$ 898,000	$ 3,800,000
Theshold for individual impairment evaluation	250,000
Impaired loans with a related allowance for loan losses, related allowance	1,397,000	4,101,000
Total impaired loans, recorded investment	33,554,000	77,896,000
Total impaired loans, unpaid principal balance	36,561,000	96,169,000
Total impaired loans, average recorded investment	65,148,000	80,248,000
Total impaired loans, interest income recognized	1,400,000	1,096,000
Allowance for loan losses	25,149,000	32,848,000
Outstanding balance of purchased impaired loans	95,212
Allowance for Purchased Impaired Loans Excess Credit Discount
Impaired Loans
Allowance for loan losses	7,000	49,000
Real Estate Loans | Construction Loans
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	6,212,000	28,067,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	7,676,000	40,045,000
Impaired loans without a related allowance for loan losses, average recorded investment	18,748,000	27,010,000
Impaired loans without a related allowance for loan losses, interest income recognized	307,000	234,000
Impaired loans with a related allowance for loan losses, recorded investment	1,958,000	1,011,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	2,136,000	1,011,000
Impaired loans with a related allowance for loan losses, related allowance	191,000	570,000
Impaired loans with a related allowance for loan losses, average recorded investment	2,929,000	7,195,000
Impaired loans with a related allowance for loan losses, interest income recognized	4,000	50,000
Total impaired loans, recorded investment	8,170,000	29,078,000
Total impaired loans, unpaid principal balance	9,812,000	41,056,000
Total impaired loans, average recorded investment	21,677,000	34,205,000
Total impaired loans, interest income recognized	311,000	284,000
Real Estate Loans | Owner Occupied
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	6,563,000	17,586,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	7,071,000	20,070,000
Impaired loans without a related allowance for loan losses, average recorded investment	15,175,000	15,319,000
Impaired loans without a related allowance for loan losses, interest income recognized	228,000	272,000
Impaired loans with a related allowance for loan losses, recorded investment	4,961,000	6,459,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	5,082,000	6,533,000
Impaired loans with a related allowance for loan losses, related allowance	189,000	585,000
Impaired loans with a related allowance for loan losses, average recorded investment	5,163,000	4,044,000
Impaired loans with a related allowance for loan losses, interest income recognized	326,000	53,000
Total impaired loans, recorded investment	11,524,000	24,045,000
Total impaired loans, unpaid principal balance	12,153,000	26,603,000
Total impaired loans, average recorded investment	20,338,000	19,363,000
Total impaired loans, interest income recognized	554,000	325,000
Real Estate Loans | Non-owner Occupied
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	4,976,000	8,639,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	5,358,000	11,255,000
Impaired loans without a related allowance for loan losses, average recorded investment	7,399,000	8,803,000
Impaired loans without a related allowance for loan losses, interest income recognized	254,000	210,000
Impaired loans with a related allowance for loan losses, recorded investment	561,000	975,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	643,000	1,363,000
Impaired loans with a related allowance for loan losses, related allowance	89,000	143,000
Impaired loans with a related allowance for loan losses, average recorded investment	2,212,000	3,255,000
Impaired loans with a related allowance for loan losses, interest income recognized	63,000	8,000
Total impaired loans, recorded investment	5,537,000	9,614,000
Total impaired loans, unpaid principal balance	6,001,000	12,618,000
Total impaired loans, average recorded investment	9,611,000	12,058,000
Total impaired loans, interest income recognized	317,000	218,000
Real Estate Loans | One to Four Family
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	1,435,000	3,843,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	1,503,000	4,285,000
Impaired loans without a related allowance for loan losses, average recorded investment	2,364,000	3,051,000
Impaired loans without a related allowance for loan losses, interest income recognized	42,000	35,000
Impaired loans with a related allowance for loan losses, recorded investment	0	498,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	0	517,000
Impaired loans with a related allowance for loan losses, related allowance	0	45,000
Impaired loans with a related allowance for loan losses, average recorded investment	347,000	1,473,000
Impaired loans with a related allowance for loan losses, interest income recognized	10,000	6,000
Total impaired loans, recorded investment	1,435,000	4,341,000
Total impaired loans, unpaid principal balance	1,503,000	4,802,000
Total impaired loans, average recorded investment	2,711,000	4,524,000
Total impaired loans, interest income recognized	52,000	41,000
Real Estate Loans | Multifamily
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	530,000	295,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	565,000	309,000
Impaired loans without a related allowance for loan losses, average recorded investment	701,000	302,000
Impaired loans without a related allowance for loan losses, interest income recognized	0	0
Impaired loans with a related allowance for loan losses, recorded investment	0	300,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	0	319,000
Impaired loans with a related allowance for loan losses, related allowance	0	135,000
Impaired loans with a related allowance for loan losses, average recorded investment	0	421,000
Impaired loans with a related allowance for loan losses, interest income recognized	2,000	0
Total impaired loans, recorded investment	530,000	595,000
Total impaired loans, unpaid principal balance	565,000	628,000
Total impaired loans, average recorded investment	701,000	723,000
Total impaired loans, interest income recognized	2,000	0
Real Estate Loans | Home Equity Lines of Credit
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	705,000	525,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	800,000	694,000
Impaired loans without a related allowance for loan losses, average recorded investment	1,424,000	686,000
Impaired loans without a related allowance for loan losses, interest income recognized	13,000	0
Impaired loans with a related allowance for loan losses, recorded investment	0	403,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	0	412,000
Impaired loans with a related allowance for loan losses, related allowance	0	112,000
Impaired loans with a related allowance for loan losses, average recorded investment	36,000	654,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	4,000
Total impaired loans, recorded investment	705,000	928,000
Total impaired loans, unpaid principal balance	800,000	1,106,000
Total impaired loans, average recorded investment	1,460,000	1,340,000
Total impaired loans, interest income recognized	13,000	4,000
Commercial
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	4,460,000	6,381,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	4,482,000	6,436,000
Impaired loans without a related allowance for loan losses, average recorded investment	6,350,000	4,280,000
Impaired loans without a related allowance for loan losses, interest income recognized	143,000	132,000
Impaired loans with a related allowance for loan losses, recorded investment	1,193,000	2,914,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	1,245,000	2,920,000
Impaired loans with a related allowance for loan losses, related allowance	928,000	2,511,000
Impaired loans with a related allowance for loan losses, average recorded investment	2,249,000	3,655,000
Impaired loans with a related allowance for loan losses, interest income recognized	8,000	92,000
Total impaired loans, recorded investment	5,653,000	9,295,000
Total impaired loans, unpaid principal balance	5,727,000	9,356,000
Total impaired loans, average recorded investment	8,599,000	7,935,000
Total impaired loans, interest income recognized	151,000	224,000
Consumer and other
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	0	0
Impaired loans without a related allowance for loan losses, unpaid principal balance	0	0
Impaired loans without a related allowance for loan losses, average recorded investment	0	0
Impaired loans without a related allowance for loan losses, interest income recognized	0	0
Impaired loans with a related allowance for loan losses, recorded investment	0	0
Impaired loans with a related allowance for loan losses, unpaid principal balance	0	0
Impaired loans with a related allowance for loan losses, related allowance	0	0
Impaired loans with a related allowance for loan losses, average recorded investment	51,000	100,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	0
Total impaired loans, recorded investment	0	0
Total impaired loans, unpaid principal balance	0	0
Total impaired loans, average recorded investment	51,000	100,000
Total impaired loans, interest income recognized	$ 0	$ 0