Deposit Accounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Transaction accounts
Noninterest-bearing checking	$ 366,755,000	$ 213,636,000
Interest-bearing checking	120,886,000	14,299,000
Money market	427,577,000	236,206,000
Regular passbook	76,412,000	79,420,000
Total transaction accounts	991,630,000	543,561,000
Certificates of deposit accounts
Up to $100,000	125,313,000	157,150,000
Over $100,000 to $250,000	130,711,000	148,531,000
Over $250,000	58,632,000	55,526,000
Total certificates of deposit accounts	314,656,000	361,207,000
Total deposits	1,306,286,000	904,768,000
Transaction accounts, Weighted Average Interest Rate
Noninterest-bearing checking (as a percent)	0.00%	0.00%
Interest-bearing checking (as a percent)	0.11%	0.10%
Money market (as a percent)	0.29%	0.32%
Regular passbook (as a percent)	0.14%	0.22%
Total transaction accounts (as a percent)	0.15%	0.19%
Certificates of deposit accounts, Weighted Average Interest Rate
Up to $100,000 (as a percent)	0.80%	0.97%
Over $100,000 to $250,000 (as a percent)	0.93%	1.02%
Over $250,000 (as a percent)	0.95%	1.04%
Total certificates of deposit accounts (as a percent)	0.88%	1.00%
Total deposits (as a percent)	0.33%	0.51%
Certificates of deposit accounts, Balance
Within 3 months	36,547,000
4 to 6 months	52,738,000
7 to 12 months	113,214,000
13 to 24 months	101,263,000
25 to 36 months	7,099,000
37 to 60 months	3,134,000
Over 60 months	661,000
Total certificates of deposit accounts	314,656,000	361,207,000
Certificates of deposit accounts, Weighted average interest rate
Within 3 months (as a percent)	0.47%
4 to 6 months (as a percent)	0.79%
7 to 12 months (as a percent)	0.78%
13 to 24 months (as a percent)	1.16%
25 to 36 months (as a percent)	1.11%
37 to 60 months (as a percent)	1.56%
Over 60 months (as a percent)	0.96%
Total certificates of deposit accounts (as a percent)	0.88%	1.00%
Average cost of deposits (as a percent)	0.47%	0.81%
Interest expense on deposit accounts
Checking accounts	110,000	82,000	126,000
Passbook accounts	103,000	266,000	516,000
Money market accounts	1,043,000	727,000	906,000
Certificates of deposit accounts	2,809,000	4,778,000	6,740,000
Total interest-bearing deposits	4,065,000	5,853,000	8,288,000
Accrued interest on deposits	$ 94,000	$ 71,000