Long-Term Borrowings (Narrative) (Details) - USD ($)	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Proceeds from long-term borrowings	$ 50,000,000.0
Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Two	1.71%
Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Three	2.00%
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Four	1.73%
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Five	1.74%
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing after Rolling Year Five	1.43%
Total long-term borrowings	1.73%	2.51%
Long-term Debt, Weighted Average Interest Rate, over Time	1.61%
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	0.77%
FHLB amortizing, fixed-rate advances
FHLB Advances	$ 8,815,000	$ 10,672,000
FHLB amortizing, fixed-rate advances \| Minimum
Long-term Debt, Weighted Average Interest Rate, over Time	500.00%
FHLB amortizing, fixed-rate advances \| Maximum
Federal Home Loan Bank, advances, general debt obligations, disclosures, maturities period	10 years
FHLB putable, non-amortizing, fixed-rate advances
Number of agreements	1
FHLB Advances	$ 95,000,000	$ 65,000,000
FHLB putable, non-amortizing, fixed-rate advances \| Minimum
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Maturities Period	1 year
FHLB putable, non-amortizing, fixed-rate advances \| Maximum
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Maturities Period	9 years
FHLB putable, non-amortizing, fixed-rate advances
Number of agreements	2
Long-term Federal Home Loan Bank Advances, Current	$ 20,000,000.0

Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Maturities Period

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Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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The current portion of Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Maturity period on fixed rate advances made and reported by Federal Home Loan Bank (FHLBank), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate on advances made and reported by Federal Home Loan Bank maturing in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate of long-term debt outstanding calculated over time.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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