Loans Receivable, Net (Details - Credit Quality) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Credit Quality Indicators [Line Items]
Average Age, Financing Receivable	10 years 1 month 6 days	9 years 10 months 24 days
Greater Than 10% of Loans, States Other than California, Count	0	0
CALIFORNIA | One- To Four-Family and Home Equity Benchmark [Member] | Financing Receivables, State, Risk [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	37.00%	37.00%
One- To Four-Family [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	$ 2,370,000,000	$ 2,488,000,000
Average estimated current LTV/CLTV	76.00%	77.00%
Average LTV/CLTV at loan origination	71.00%	71.00%
One- To Four-Family [Member] | Minimum [Member]
Credit Quality Indicators [Line Items]
Loans, Interest-Only Period	5 years
Loans, Amortization Period	20 years
One- To Four-Family [Member] | Maximum [Member]
Credit Quality Indicators [Line Items]
Loans, Interest-Only Period	10 years
Loans, Amortization Period	25 years
One- To Four-Family [Member] | One- To Four-Family Benchmark [Member] | Interest Only Not Yet Amortizing Risk [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	38.00%
One- To Four-Family [Member] | One- To Four-Family Benchmark [Member] | Interest only, Already Amortizing
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	62.00%
One- To Four-Family [Member] | One- To Four-Family Benchmark [Member] | Interest Only Conversion to Amortizing Loans, Year Ending December 31, 2016
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	15.00%
One- To Four-Family [Member] | One- To Four-Family Benchmark [Member] | Interest Only Conversion to Amortizing Loans, Year Ending December 31, 2017
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	23.00%
One- To Four-Family [Member] | One- To Four-Family Benchmark [Member] | Interest Only Conversion to Amortizing Loans, Year Ending December 31, 2018 and after
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	0.00%
One- To Four-Family [Member] | Interest Only Not Yet Amortizing [Member] | Interest Only Not Yet Amortizing Borrowers Paying Minimum 2500 Risk [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	17.00%
Annual Principal Payment Threshold	$ 2,500
One- To Four-Family [Member] | Interest Only Not Yet Amortizing Borrowers Paying Minimum 2500 [Member] | Interest Only Not Yet Amortizing Borrowers Paying Minimum 10000 Risk [Member]
Credit Quality Indicators [Line Items]
Annual Principal Payment Threshold	$ 10,000
One- To Four-Family [Member] | Interest Only Not Yet Amortizing Borrowers Paying Minimum 2500 [Member] | Interest Only Not Yet Amortizing Borrowers Paying Minimum 10000 Risk [Member] | Maximum [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	50.00%
One- To Four-Family [Member] | FICO Score, Greater than 720 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	$ 1,357,000,000	$ 1,423,000,000
One- To Four-Family [Member] | FICO Score, 719 to 700 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	219,000,000	246,000,000
One- To Four-Family [Member] | FICO Score, 699 to 680 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	195,000,000	198,000,000
One- To Four-Family [Member] | FICO Score, 679 to 660 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	163,000,000	150,000,000
One- To Four-Family [Member] | FICO Score, 659 to 620 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	167,000,000	198,000,000
One- To Four-Family [Member] | FICO Score, Less than 620 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	269,000,000	273,000,000
One- To Four-Family [Member] | Current FICO Score Not Available [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	37,000,000	39,000,000
One- To Four-Family [Member] | LTV Less than 80 Percent [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	1,482,000,000	1,519,000,000
One- To Four-Family [Member] | LTV 80 to 100 Percent [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	560,000,000	609,000,000
One- To Four-Family [Member] | LTV 100 to 120 Percent [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	206,000,000	227,000,000
One- To Four-Family [Member] | LTV Greater than 120 Percent [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	122,000,000	133,000,000
Home Equity [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	$ 1,974,000,000	$ 2,114,000,000
Average estimated current LTV/CLTV	90.00%	90.00%
Average LTV/CLTV at loan origination	81.00%	81.00%
Home Equity [Member] | Minimum [Member]
Credit Quality Indicators [Line Items]
Loans, Draw Period	5 years
Home Equity [Member] | Maximum [Member]
Credit Quality Indicators [Line Items]
Loans, Draw Period	10 years
Home Equity [Member] | Interest Only Not Yet Amortizing [Member] | Interest Only Not Yet Amortizing Borrowers Paying Minimum 500 Risk [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	40.00%
Annual Principal Payment Threshold	$ 500
Home Equity [Member] | Interest Only Not Yet Amortizing Borrowers Paying Minimum 500 [Member] | Interest Only Not Yet Amortizing Borrowers Paying Minimum 2500 Risk [Member]
Credit Quality Indicators [Line Items]
Annual Principal Payment Threshold	$ 2,500
Home Equity [Member] | Interest Only Not Yet Amortizing Borrowers Paying Minimum 500 [Member] | Interest Only Not Yet Amortizing Borrowers Paying Minimum 2500 Risk [Member] | Maximum [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	50.00%
Home Equity [Member] | Home Equity Line of Credit Benchmark [Member] | Interest Only Not Yet Amortizing Risk [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	47.00%
Home Equity [Member] | Home Equity Line of Credit Benchmark [Member] | Interest only, Already Amortizing
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	53.00%
Home Equity [Member] | Home Equity Line of Credit Benchmark [Member] | Interest Only Conversion to Amortizing Loans, Year Ending December 31, 2016
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	32.00%
Home Equity [Member] | Home Equity Line of Credit Benchmark [Member] | Interest Only Conversion to Amortizing Loans, Year Ending December 31, 2017
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	14.00%
Home Equity [Member] | Home Equity Line of Credit Benchmark [Member] | Interest Only Conversion to Amortizing Loans, Year Ending December 31, 2018 and after
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	1.00%
Home Equity [Member] | Home Equity Line of Credit Benchmark [Member] | Balloon Loan, Percentage [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	3.00%
Home Equity [Member] | Home Equity Benchmark [Member] | Financing Receivables in First Lien Position, Percentage [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	13.00%
Home Equity [Member] | Home Equity Benchmark [Member] | Financing Receivables in the First and Second Lien Position, Percent [Member] | Maximum [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	1.00%
Home Equity [Member] | Home Equity Benchmark [Member] | Home Equity Installment Loans, Percentage [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	18.00%
Home Equity [Member] | Home Equity Benchmark [Member] | Home Equity Line of Credit, Percentage [Member]
Credit Quality Indicators [Line Items]
Concentration Risk, Percentage	82.00%
Home Equity [Member] | FICO Score, Greater than 720 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	$ 994,000,000	$ 1,069,000,000
Home Equity [Member] | FICO Score, 719 to 700 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	201,000,000	222,000,000
Home Equity [Member] | FICO Score, 699 to 680 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	177,000,000	183,000,000
Home Equity [Member] | FICO Score, 679 to 660 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	144,000,000	152,000,000
Home Equity [Member] | FICO Score, 659 to 620 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	196,000,000	203,000,000
Home Equity [Member] | FICO Score, Less than 620 [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	262,000,000	285,000,000
Home Equity [Member] | Current FICO Score Not Available [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	3,000,000	3,000,000
Home Equity [Member] | LTV Less than 80 Percent [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	802,000,000	843,000,000
Home Equity [Member] | LTV 80 to 100 Percent [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	507,000,000	549,000,000
Home Equity [Member] | LTV 100 to 120 Percent [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	387,000,000	420,000,000
Home Equity [Member] | LTV Greater than 120 Percent [Member]
Credit Quality Indicators [Line Items]
Total mortgage loans receivable	$ 278,000,000	$ 302,000,000