Employee Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (on a pre-tax basis):
Net (gain) loss		$ (5,908)	$ 5,093	$ 3,710
Prior service credits	[1]			(16)
Recognized in other comprehensive income (loss)		8,752	(2,952)	(2,526)
Qualified Pension Plan [Member]
Net Periodic Benefit Cost:
Service cost	[2]	2,369	2,164	2,037
Interest cost	[3]	2,004	2,505	2,967
Expected return on plan assets	[3]	(4,815)	(4,538)	(4,495)
Amortization of prior service credit	[3]	0	0	(16)
Recognized net actuarial loss	[3]	2,121	1,582	792
Net periodic benefit cost		1,679	1,713	1,285
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (on a pre-tax basis):
Net (gain) loss		(8,132)	1,708	890
Prior service credits		0	0	16
Recognized in other comprehensive income (loss)		(8,132)	1,708	906
Total recognized in net periodic benefit cost and other comprehensive income (loss)		(6,453)	3,421	2,191
Non-Qualified Retirement Plans [Member]
Net Periodic Benefit Cost:
Service cost	[2]	208	170	126
Interest cost	[3]	337	465	563
Expected return on plan assets	[3]	0	0	0
Amortization of prior service credit	[3]	0	0	0
Recognized net actuarial loss	[3]	723	560	408
Net periodic benefit cost		1,268	1,195	1,097
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (on a pre-tax basis):
Net (gain) loss		(621)	1,244	1,620
Prior service credits		0	0	0
Recognized in other comprehensive income (loss)		(621)	1,244	1,620
Total recognized in net periodic benefit cost and other comprehensive income (loss)		$ 647	$ 2,439	$ 2,717

[1] The pre-tax amounts are included in other expenses in the Consolidated Statements of Income.

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

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