Financial Instruments with Off-Balance Sheet Risk (Summary of Financial Instrument Commitments) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Commitments to Grant Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding letters of credit	$ 81,997	$ 97,037
Unfunded Commitments Under Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding letters of credit	13,092	13,448
Outstanding Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding letters of credit	$ 3,906	$ 2,624