Fair Value Disclosures (Details - Recurring and Nonrecurring) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 14,005,000		$ 12,589,000
Assets measured at fair value on recurring basis percentage of total assets	29.00%		28.00%
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy (Textuals) [Abstract]
Fair value, assets, Level 1 to Level 2 transfers, amount	$ 0	$ 0
Fair value, assets, Level 2 to Level 1 transfers, amount	0	0
Fair value, liabilities, Level 1 to Level 2 transfers, amount	0	0
Fair value, liabilities, Level 2 to Level 1 transfers, amount	$ 0	0
Less than [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities measured at fair value on recurring basis percentage of total liabilities	1.00%		1.00%
Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 14,005,000		$ 12,589,000
Derivative assets	8,000		10,000
Total assets measured at fair value on a recurring basis	14,013,000		12,599,000
Derivative Liability	131,000		55,000
Total liabilities measured at fair value on a recurring basis	131,000		55,000
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total loans receivable	19,000		63,000
REO	17,000		26,000
Total Assets Measured at Fair Value On A Nonrecurring Basis	36,000		89,000
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	33,000		32,000
Total assets measured at fair value on a recurring basis	33,000		32,000
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	13,972,000		12,557,000
Derivative assets	8,000		10,000
Total assets measured at fair value on a recurring basis	13,980,000		12,567,000
Derivative Liability	131,000		55,000
Total liabilities measured at fair value on a recurring basis	131,000		55,000
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total loans receivable	19,000		63,000
REO	17,000		26,000
Total Assets Measured at Fair Value On A Nonrecurring Basis	36,000		89,000
Loans Receivable [Member]
Gains Losses On Nonrecurring Fair Value Measurements [Abstract]
(Gains) losses measured at fair value	4,000	6,000
Real Estate Owned [Member]
Gains Losses On Nonrecurring Fair Value Measurements [Abstract]
(Gains) losses measured at fair value	0	1,000
One- To Four-Family [Member] | Loans Receivable [Member]
Gains Losses On Nonrecurring Fair Value Measurements [Abstract]
(Gains) losses measured at fair value	1,000	2,000
One- To Four-Family [Member] | Loans Receivable [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total loans receivable	11,000		41,000
One- To Four-Family [Member] | Loans Receivable [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total loans receivable	11,000		41,000
Home Equity [Member] | Loans Receivable [Member]
Gains Losses On Nonrecurring Fair Value Measurements [Abstract]
(Gains) losses measured at fair value	3,000	$ 4,000
Home Equity [Member] | Loans Receivable [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total loans receivable	8,000		22,000
Home Equity [Member] | Loans Receivable [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total loans receivable	8,000		22,000
Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	13,972,000		12,557,000
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	13,972,000		12,557,000
Debt Securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	13,972,000		12,557,000
Agency Mortgage-Backed Securities and CMOs [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	12,759,000		11,763,000
Agency Mortgage-Backed Securities and CMOs [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	12,759,000		11,763,000
Agency Mortgage-Backed Securities and CMOs [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	12,759,000		11,763,000
Agency Debentures [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	804,000		557,000
Agency Debentures [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	804,000		557,000
Agency Debentures [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	804,000		557,000
U.S. Treasuries [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	293,000		143,000
U.S. Treasuries [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	293,000		143,000
U.S. Treasuries [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	293,000		143,000
Agency Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	77,000		55,000
Agency Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	77,000		55,000
Agency Debt Securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	77,000		55,000
Municipal Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	35,000		35,000
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	35,000		35,000
Municipal Bonds [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	35,000		35,000
Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	4,000		4,000
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	4,000		4,000
Corporate Bonds [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	4,000		4,000
Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	33,000		32,000
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	33,000		32,000
Equity Securities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 33,000		$ 32,000