Loans and Allowance for Loan Losses - Impaired Loans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Impaired Loans
Theshold for individual impairment evaluation			$ 250,000
Impaired loans with a related allowance for loan losses, related allowance	1,988,000		1,988,000		1,397,000
Total impaired loans, recorded investment	29,441,000		29,441,000		33,554,000
Total impaired loans, unpaid principal balance	32,064,000		32,064,000		36,561,000
Total impaired loans, average recorded investment	32,326,000	70,633,000	25,914,000	74,856,000
Total impaired loans, interest income recognized	463,000	188,000	221,000	898,000
Allowance for loan losses	22,924,000		22,924,000		25,149,000	[1]
Outstanding balance of purchased impaired loans	93,095		93,095
Allowance for Purchased Impaired Loans Excess Credit Discount
Impaired Loans
Allowance for loan losses	0		0		6,672
Real Estate Loans | Construction Loans
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	4,650,000		4,650,000		6,212,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	6,579,000		6,579,000		7,676,000
Impaired loans without a related allowance for loan losses, average recorded investment	5,665,000	21,072,000	3,938,000	23,311,000
Impaired loans without a related allowance for loan losses, interest income recognized	60,000	36,000	36,000	150,000
Impaired loans with a related allowance for loan losses, recorded investment	251,000		251,000		1,958,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	273,000		273,000		2,136,000
Impaired loans with a related allowance for loan losses, related allowance	11,000		11,000		191,000
Impaired loans with a related allowance for loan losses, average recorded investment	1,613,000	2,205,000	846,000	1,406,000
Impaired loans with a related allowance for loan losses, interest income recognized	25,000	0	3,000	0
Total impaired loans, recorded investment	4,901,000		4,901,000		8,170,000
Total impaired loans, unpaid principal balance	6,852,000		6,852,000		9,812,000
Total impaired loans, average recorded investment	7,278,000	23,277,000	4,784,000	24,717,000
Total impaired loans, interest income recognized	85,000	36,000	39,000	150,000
Real Estate Loans | Owner Occupied
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	3,242,000		3,242,000		6,563,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	3,374,000		3,374,000		7,071,000
Impaired loans without a related allowance for loan losses, average recorded investment	3,282,000	14,112,000	2,443,000	16,228,000
Impaired loans without a related allowance for loan losses, interest income recognized	49,000	22,000	24,000	308,000
Impaired loans with a related allowance for loan losses, recorded investment	7,627,000		7,627,000		4,961,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	7,893,000		7,893,000		5,082,000
Impaired loans with a related allowance for loan losses, related allowance	386,000		386,000		189,000
Impaired loans with a related allowance for loan losses, average recorded investment	7,679,000	8,877,000	7,655,000	7,631,000
Impaired loans with a related allowance for loan losses, interest income recognized	116,000	69,000	58,000	69,000
Total impaired loans, recorded investment	10,869,000		10,869,000		11,524,000
Total impaired loans, unpaid principal balance	11,267,000		11,267,000		12,153,000
Total impaired loans, average recorded investment	10,961,000	22,989,000	10,098,000	23,859,000
Total impaired loans, interest income recognized	165,000	91,000	82,000	377,000
Real Estate Loans | Non-owner Occupied
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	5,168,000		5,168,000		4,976,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	5,219,000		5,219,000		5,358,000
Impaired loans without a related allowance for loan losses, average recorded investment	5,417,000	7,828,000	3,907,000	10,150,000
Impaired loans without a related allowance for loan losses, interest income recognized	113,000	9,000	53,000	10,000
Impaired loans with a related allowance for loan losses, recorded investment	420,000		420,000		561,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	420,000		420,000		643,000
Impaired loans with a related allowance for loan losses, related allowance	55,000		55,000		89,000
Impaired loans with a related allowance for loan losses, average recorded investment	464,000	1,028,000	426,000	727,000
Impaired loans with a related allowance for loan losses, interest income recognized	2,000	16,000	0	16,000
Total impaired loans, recorded investment	5,588,000		5,588,000		5,537,000
Total impaired loans, unpaid principal balance	5,639,000		5,639,000		6,001,000
Total impaired loans, average recorded investment	5,881,000	8,856,000	4,333,000	10,877,000
Total impaired loans, interest income recognized	115,000	25,000	53,000	26,000
Real Estate Loans | One to Four Family
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	682,000		682,000		1,435,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	742,000		742,000		1,503,000
Impaired loans without a related allowance for loan losses, average recorded investment	710,000	3,078,000	514,000	3,413,000
Impaired loans without a related allowance for loan losses, interest income recognized	14,000	5,000	7,000	29,000
Impaired loans with a related allowance for loan losses, recorded investment	341,000		341,000		0
Impaired loans with a related allowance for loan losses, unpaid principal balance	341,000		341,000		0
Impaired loans with a related allowance for loan losses, related allowance	171,000		171,000		0
Impaired loans with a related allowance for loan losses, average recorded investment	401,000	547,000	396,000	421,000
Impaired loans with a related allowance for loan losses, interest income recognized	3,000	3,000	0	3,000
Total impaired loans, recorded investment	1,023,000		1,023,000		1,435,000
Total impaired loans, unpaid principal balance	1,083,000		1,083,000		1,503,000
Total impaired loans, average recorded investment	1,111,000	3,625,000	910,000	3,834,000
Total impaired loans, interest income recognized	17,000	8,000	7,000	32,000
Real Estate Loans | Multifamily
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	253,000		253,000		530,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	291,000		291,000		565,000
Impaired loans without a related allowance for loan losses, average recorded investment	258,000	719,000	192,000	702,000
Impaired loans without a related allowance for loan losses, interest income recognized	0	0	0	4,000
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	0	0	0	43,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	0	0	7,000
Total impaired loans, recorded investment	253,000		253,000		530,000
Total impaired loans, unpaid principal balance	291,000		291,000		565,000
Total impaired loans, average recorded investment	258,000	719,000	192,000	745,000
Total impaired loans, interest income recognized	0	0	0	11,000
Real Estate Loans | Home Equity Lines of Credit
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	458,000		458,000		705,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	500,000		500,000		800,000
Impaired loans without a related allowance for loan losses, average recorded investment	468,000	1,236,000	345,000	1,154,000
Impaired loans without a related allowance for loan losses, interest income recognized	0	0	0	8,000
Impaired loans with a related allowance for loan losses, recorded investment	740,000		740,000		0
Impaired loans with a related allowance for loan losses, unpaid principal balance	750,000		750,000		0
Impaired loans with a related allowance for loan losses, related allowance	566,000		566,000		0
Impaired loans with a related allowance for loan losses, average recorded investment	743,000	118,000	741,000	159,000
Impaired loans with a related allowance for loan losses, interest income recognized	2,000	0	0	0
Total impaired loans, recorded investment	1,198,000		1,198,000		705,000
Total impaired loans, unpaid principal balance	1,250,000		1,250,000		800,000
Total impaired loans, average recorded investment	1,211,000	1,354,000	1,086,000	1,313,000
Total impaired loans, interest income recognized	2,000	0	0	8,000
Commercial
Impaired Loans
Impaired loans without a related allowance for loan losses, recorded investment	4,416,000		4,416,000		4,460,000
Impaired loans without a related allowance for loan losses, unpaid principal balance	4,437,000		4,437,000		4,482,000
Impaired loans without a related allowance for loan losses, average recorded investment	4,433,000	6,534,000	3,317,000	6,326,000
Impaired loans without a related allowance for loan losses, interest income recognized	79,000	28,000	40,000	130,000
Impaired loans with a related allowance for loan losses, recorded investment	1,193,000		1,193,000		1,193,000
Impaired loans with a related allowance for loan losses, unpaid principal balance	1,245,000		1,245,000		1,245,000
Impaired loans with a related allowance for loan losses, related allowance	799,000		799,000		928,000
Impaired loans with a related allowance for loan losses, average recorded investment	1,193,000	3,115,000	1,193,000	3,090,000
Impaired loans with a related allowance for loan losses, interest income recognized	0	0	0	164,000
Total impaired loans, recorded investment	5,609,000		5,609,000		5,653,000
Total impaired loans, unpaid principal balance	5,682,000		5,682,000		5,727,000
Total impaired loans, average recorded investment	5,626,000	9,649,000	4,510,000	9,416,000
Total impaired loans, interest income recognized	79,000	28,000	40,000	294,000
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	1,000	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	0	164,000	0	95,000
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	0	164,000	1,000	95,000
Total impaired loans, interest income recognized	$ 0	$ 0	$ 0	$ 0

[1] Derived from audited consolidated financial statements