Long-Term Borrowings (Minimum Annual Retirements of Long-Term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Aggregate minimum annual retirements of long-term borrowings in future periods:
2020	$ 1,979
2021	16,521
2022	1,157
2023	869
2024	641
Thereafter	89,401
Long-term borrowings	$ 110,568	$ 83,123
Weighted average interest rate, 2020 retirements	1.53%
Weighted average interest rate, 2021 retirements	1.98%
Weighted average interest rate, 2022 retirements	1.50%
Weighted average interest rate, 2023 retirements	1.47%
Weighted average interest rate, 2024 retirements	1.45%
Weighted average interest rate, thereafter	1.53%
Total long-term borrowings, Weighted-Average Rate	1.72%	2.51%
Long-term Debt, Weighted Average Interest Rate, over Time	1.60%

Long-term Debt, Maturities, Repayments of Principal after Year Five, Weighted Average Interest Rate

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Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months, Weighted Average Interest Rate

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Long-term Debt, Maturities, Repayments of Principal in Year Five, Weighted Average Interest Rate

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Long-term Debt, Maturities, Repayments of Principal in Year Four, Weighted Average Interest Rate

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- Definition

Long-term Debt, Maturities, Repayments of Principal in Year Three, Weighted Average Interest Rate

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Long-term Debt, Maturities, Repayments of Principal in Year Two, Weighted Average Interest Rate

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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