Employee Benefit Plans (Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in funded status recognized in other comprehensive loss, before taxes
Total recognized in OCI, before taxes		$ 1,671	$ (2,332)	$ 1,803
Supplemental Executive Retirement Plan [Member]
Net period benefit cost
Service cost	[1]	395	446	335
Interest cost	[2]	523	488	452
Recognized net actuarial loss(2)	[2]	240	561	246
Net periodic benefit cost		1,158	1,495	1,033
Changes in funded status recognized in other comprehensive loss, before taxes
Net actuarial loss (gain) arising during period		1,524	(1,534)	1,955
Amortization of net unrecognized actuarial loss		(240)	(561)	(246)
Total recognized in OCI, before taxes		1,284	(2,095)	1,709
Total recognized in net periodic benefit cost and OCI, before taxes		2,442	(600)	2,742
Other Postretirement Benefits Plan [Member]
Net period benefit cost
Service cost	[1]	48	46	53
Interest cost	[2]	148	132	144
Recognized net actuarial loss(2)	[2]	31	52	40
Amortization of prior service credit(2)	[2]	(24)	(24)	(24)
Net periodic benefit cost		203	206	213
Changes in funded status recognized in other comprehensive loss, before taxes
Net actuarial loss (gain) arising during period		394	(209)	110
Amortization of net unrecognized actuarial loss		(31)	(52)	(40)
Amortization of prior service credit		24	24	24
Total recognized in OCI, before taxes		387	(237)	94
Total recognized in net periodic benefit cost and OCI, before taxes		$ 590	$ (31)	$ 307

[1] (1)Presented in salaries and employee benefits on the consolidated statements of income.

[2] (2)Presented in other expenses on the consolidated statements of income.