Employee Benefits (Schedule of Net Funded (Unfunded) Status) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Qualified Pension Plan [Member]
Change in Benefit Obligation:
Benefit obligation at beginning of period		$ 94,742	$ 83,141
Service cost	[1]	2,369	2,164	$ 2,037
Interest cost	[2]	2,004	2,505	2,967
Actuarial (gain) loss		(4,011)	10,378
Benefits paid		(5,556)	(3,334)
Administrative expenses		(140)	(112)
Benefit obligation at end of period		89,408	94,742	83,141
Change in Plan Assets:
Fair value of plan assets at beginning of period		101,929	93,749
Actual return on plan assets		6,814	11,626
Employer contributions		0	0
Benefits paid		(5,556)	(3,334)
Administrative expenses		(140)	(112)
Fair value of plan assets at end of period		103,047	101,929	93,749
Funded (unfunded) status at end of period		13,639	7,187
Non-Qualified Retirement Plans [Member]
Change in Benefit Obligation:
Benefit obligation at beginning of period		17,973	16,438
Service cost	[1]	208	170	126
Interest cost	[2]	337	465	563
Actuarial (gain) loss		102	1,803
Benefits paid		(903)	(903)
Administrative expenses		0	0
Benefit obligation at end of period		17,717	17,973	16,438
Change in Plan Assets:
Fair value of plan assets at beginning of period		0	0
Actual return on plan assets		0	0
Employer contributions		903	903
Benefits paid		(903)	(903)
Administrative expenses		0	0
Fair value of plan assets at end of period		0	0	$ 0
Funded (unfunded) status at end of period		$ (17,717)	$ (17,973)

[1] Included in salaries and employee benefits expense in the Consolidated Statements of Income.

[2] Included in other expenses in the Consolidated Statements of Income.