Fair Value Disclosures (Details - Recurring and Nonrecurring) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 12,589,000	$ 12,388,000
Assets measured at fair value on recurring basis percentage of total assets	28.00%	27.00%
Gains Losses On Nonrecurring Fair Value Measurements [Abstract]
Losses on goodwill measured at fair value	$ 0	$ 0	$ 142,000
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	$ 12,589,000	$ 12,388,000
Derivative assets	10,000	24,000
Total assets measured at fair value on a recurring basis	12,599,000	12,412,000
Derivative Liability	55,000	66,000
Total liabilities measured at fair value on a recurring basis	55,000	66,000
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total loans receivable	63,000	78,000
REO	26,000	38,000
Total Assets Measured at Fair Value On A Nonrecurring Basis	89,000	116,000
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	32,000	33,000
Total assets measured at fair value on a recurring basis	32,000	33,000
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	12,557,000	12,355,000
Derivative assets	10,000	24,000
Total assets measured at fair value on a recurring basis	12,567,000	12,379,000
Derivative Liability	55,000	66,000
Total liabilities measured at fair value on a recurring basis	55,000	66,000
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total loans receivable	63,000	78,000
REO	26,000	38,000
Total Assets Measured at Fair Value On A Nonrecurring Basis	89,000	116,000
Loans Receivable [Member]
Gains Losses On Nonrecurring Fair Value Measurements [Abstract]
(Gains) losses measured at fair value	21,000	40,000	98,000
Real Estate Owned [Member]
Gains Losses On Nonrecurring Fair Value Measurements [Abstract]
(Gains) losses measured at fair value	0	(2,000)	(1,000)
One- To Four-Family [Member] | Loans Receivable [Member]
Gains Losses On Nonrecurring Fair Value Measurements [Abstract]
(Gains) losses measured at fair value	7,000	10,000	40,000
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	41,000	46,000
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	41,000	46,000
Home Equity [Member] | Loans Receivable [Member]
Gains Losses On Nonrecurring Fair Value Measurements [Abstract]
(Gains) losses measured at fair value	14,000	30,000	$ 58,000
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	22,000	32,000
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	22,000	32,000
Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	12,557,000	12,355,000
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	12,557,000	12,355,000
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	12,557,000	12,355,000
Agency Mortgage-Backed Securities and CMOs [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	11,763,000	11,164,000
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	11,763,000	11,164,000
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	11,763,000	11,164,000
Agency Debentures [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	557,000	648,000
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	557,000	648,000
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	557,000	648,000
U.S. Treasuries [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	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	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	143,000
Agency Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	55,000	499,000
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	55,000	499,000
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	55,000	499,000
Municipal Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	35,000	40,000
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	40,000
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	40,000
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	32,000	33,000
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	32,000	33,000
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	$ 32,000	$ 33,000