Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, liability	$ 238,348	$ 276,425
Commitments outstanding for capital expenditures	1,254,000
Commercial loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, liability	19,534	50,235
Other loans [Member] | Fixed rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, liability	10,125	4,431
Other loans [Member] | Adjustable rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, liability	3,086	1,199
Unused lines of credit [Member] | Fixed rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, liability	29,393	28,796
Unused lines of credit [Member] | Adjustable rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, liability	159,567	174,577
Unused overdraft protection amounts on demand and NOW accounts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, liability	16,400	16,304
Standby letters of credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, liability	$ 243	$ 883