Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Equity [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax		$ (10,641)	$ (2,217)	$ (35,626)	$ (11,376)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax		2,992	624	10,027	3,200
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		(7,649)	(1,593)	(25,599)	(8,176)
COMPREHENSIVE INCOME
Change in fair value of securities available for sale, pre tax amount		(30,734)	5,109	(112,353)	(5,252)
Change in fair value of securities available for sale, tax (expense) benefit		7,000	(1,316)	26,063	1,271
Change in fair value of securities available for sale, after tax amount		(23,734)	3,793	(86,290)	(3,981)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0	0	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax		0	0	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		0	0	0	0
Change in fair value of securities available for sale, pre tax amount		(30,734)	5,109	(112,353)	(5,252)
Change in fair value of securities available for sale, tax (expense) benefit		7,000	(1,316)	26,063	1,271
Change in fair value of securities available for sale, after tax amount		(23,734)	3,793	(86,290)	(3,981)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax		(7,126)	2,481	(27,606)	(2,298)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax		2,004	(697)	7,772	647
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax		(5,122)	1,784	(19,834)	(1,651)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		3,515	4,698	8,020	9,078
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax		(988)	(1,321)	(2,255)	(2,553)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax		2,527	3,377	5,765	6,525
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax			0		653
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax			0		(184)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax			0		469
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax		158	249	317	691
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax		(44)	(70)	(89)	(194)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax		114	179	228	497
Amortization of certain costs included in net periodic retirement costs, pre tax amount		9	43	19	87
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit		(2)	(12)	(5)	(24)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax		7	31	14	63
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	[1]	167	292	336	1,431
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	[1]	(46)	(82)	(94)	(402)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	[1]	121	210	242	1,029
Total other comprehensive income, pre tax amount		(41,208)	3,184	(147,643)	(15,197)
Total other comprehensive income, tax (expense) benefit		9,946	(774)	35,996	4,069
Total other comprehensive income, after tax amount		$ (31,262)	$ 2,410	$ (111,647)	$ (11,128)

[1] The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 14 "Employee Benefit Plans" within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2021 Form 10-K.