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Fair Value Disclosures (Details - Recurring and Nonrecurring) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value $ 19,501,000 $ 23,153,000
Assets measured at fair value on recurring basis percentage of total assets 32.00% 36.00%
Fair Value, Transfers Between Level 1 and Level 2 and Level 3, 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
Asset transfer into Level 3 0 0
Asset transfer out of Level 3 0 0
Liability transfer into Level 3 0 0
Liability transfer out of Level 3 0 0
Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 19,501,000 23,153,000
Derivative assets   1,000
Total assets measured at fair value 19,501,000 23,154,000
Fair Value, Nonrecurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total loans receivable 18,000 23,000
Real estate owned 12,000 10,000
Total assets measured at fair value 30,000 33,000
Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 19,501,000 23,153,000
Derivative assets   1,000
Total assets measured at fair value 19,501,000 23,154,000
Level 3 [Member] | Fair Value, Nonrecurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total loans receivable 18,000 23,000
Real estate owned 12,000 10,000
Total assets measured at fair value 30,000 33,000
One- To Four-Family [Member] | Loans Receivable [Member] | Fair Value, Nonrecurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total loans receivable 14,000 17,000
One- To Four-Family [Member] | Loans Receivable [Member] | Level 3 [Member] | Fair Value, Nonrecurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total loans receivable 14,000 17,000
Home Equity [Member] | Loans Receivable [Member] | Fair Value, Nonrecurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total loans receivable 4,000 6,000
Home Equity [Member] | Loans Receivable [Member] | Level 3 [Member] | Fair Value, Nonrecurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total loans receivable 4,000 6,000
Agency mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 17,035,000 22,162,000
Agency mortgage-backed securities [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 17,035,000 22,162,000
Agency mortgage-backed securities [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 17,035,000 22,162,000
Agency debentures [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 659,000 839,000
Agency debentures [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 659,000 839,000
Agency debentures [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 659,000 839,000
US Treasuries [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 1,227,000  
US Treasuries [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 1,227,000  
US Treasuries [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 1,227,000  
Non-agency asset-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 417,000  
Non-agency asset-backed securities [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 417,000  
Non-agency asset-backed securities [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 417,000  
Other agency debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   139,000
Other agency debt securities [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   139,000
Other agency debt securities [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   139,000
Municipal bonds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   12,000
Municipal bonds [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   12,000
Municipal bonds [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   12,000
Non-agency mortgage backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 163,000  
Non-agency mortgage backed securities [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 163,000  
Non-agency mortgage backed securities [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value $ 163,000  
Other [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   1,000
Other [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   1,000
Other [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   $ 1,000