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Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities, Commitments and Off-Balance Sheet Arrangements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Commitments to Extend Credit Under First Mortgage Loans [Member]    
Fair Value, Off-Balance Sheet Arrangements, and Contingent Loss [Abstract]    
Off-balance sheet risks asset amount [1] $ 23,891 $ 13,389
Probable losses 0 0
Reserve for losses 2,900 921,000
Commitments to Extend Credit Under Home Equity Lines of Credit [Member]    
Fair Value, Off-Balance Sheet Arrangements, and Contingent Loss [Abstract]    
Off-balance sheet risks asset amount 13,653 13,776
Unused Portion of Construction Loans [Member]    
Fair Value, Off-Balance Sheet Arrangements, and Contingent Loss [Abstract]    
Off-balance sheet risks asset amount 74,173 90,439
Unused Portion of Business Lines of Credit [Member]    
Fair Value, Off-Balance Sheet Arrangements, and Contingent Loss [Abstract]    
Off-balance sheet risks asset amount 19,207 14,623
Standby Letters of Credit [Member]    
Fair Value, Off-Balance Sheet Arrangements, and Contingent Loss [Abstract]    
Off-balance sheet risks liability amount 1,296 885
Probable losses $ 0 $ 0
[1] (1) Excludes commitments to originate loans held for sale, which are discussed in Footnote 15 - Derivative Financial Instruments.