Loans And Allowance for Credit Losses (Credit Quality Indicators Personal Banking Loan Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Credit Quality Indicator [Line Items]
Loans charged off	$ 11,757	$ 11,926	$ 34,790	$ 29,812
Personal Banking Portfolio Segment [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	626,204		626,204		$ 984,834
Fiscal Year before Current Fiscal Year	810,528		810,528		794,378
Two Years before Current Fiscal Year	675,122		675,122		794,244
Three Years before Current Fiscal Year	680,507		680,507		839,508
Four Years before Current Fiscal Year	744,052		744,052		313,808
Prior	834,353		834,353		650,720
Revolving Loans Amortized Cost Basis	1,702,300		1,702,300		1,642,881
Total	6,073,066		6,073,066		6,020,373
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			2,566		4,729
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			2,255		2,909
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			2,185		1,939
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			1,100		770
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			408		376
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			236		393
Financing Receivable, Revolving, Writeoff			24,512		25,167
Loans charged off	11,395	$ 9,262	33,262	$ 26,549	36,283
Personal Banking Portfolio Segment [Member] | Personal Real Estate Loan [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	289,640		289,640		459,022
Fiscal Year before Current Fiscal Year	401,990		401,990		454,064
Two Years before Current Fiscal Year	418,869		418,869		535,702
Three Years before Current Fiscal Year	495,668		495,668		712,276
Four Years before Current Fiscal Year	659,842		659,842		257,360
Prior	766,611		766,611		598,997
Revolving Loans Amortized Cost Basis	10,771		10,771		8,620
Total	3,043,391		3,043,391		3,026,041
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			82		18
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			96		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			83		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			22		23
Financing Receivable, Revolving, Writeoff			0		0
Loans charged off			283		41
Personal Banking Portfolio Segment [Member] | Consumer Loan [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	332,292		332,292		519,010
Fiscal Year before Current Fiscal Year	408,538		408,538		340,314
Two Years before Current Fiscal Year	256,253		256,253		258,542
Three Years before Current Fiscal Year	184,839		184,839		127,232
Four Years before Current Fiscal Year	84,210		84,210		56,448
Prior	67,742		67,742		51,723
Revolving Loans Amortized Cost Basis	774,407		774,407		724,454
Total	2,108,281		2,108,281		2,077,723
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			482		926
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			2,173		2,891
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			2,089		1,939
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			1,017		770
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			408		376
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			214		370
Financing Receivable, Revolving, Writeoff			1,722		1,051
Loans charged off			8,105		8,323
Personal Banking Portfolio Segment [Member] | Revolving home equity
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	342,376		342,376		319,894
Total	342,376		342,376		319,894
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Revolving, Writeoff			0		11
Loans charged off			0		11
Personal Banking Portfolio Segment [Member] | Credit Card Receivable [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	574,746		574,746		589,913
Total	574,746		574,746		589,913
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Revolving, Writeoff			22,790		24,105
Loans charged off			22,790		24,105
Personal Banking Portfolio Segment [Member] | Overdrafts
Credit Quality Indicator [Line Items]
Current Fiscal Year	4,272		4,272		6,802
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	0		0		0
Total	4,272		4,272		6,802
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			2,084		3,803
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			0		0
Financing Receivable, Revolving, Writeoff			0		0
Loans charged off			2,084		3,803
Personal Banking Portfolio Segment [Member] | Current to 90 Days Past Due
Credit Quality Indicator [Line Items]
Current Fiscal Year	625,546		625,546		981,124
Fiscal Year before Current Fiscal Year	808,802		808,802		792,257
Two Years before Current Fiscal Year	672,979		672,979		791,661
Three Years before Current Fiscal Year	678,350		678,350		838,650
Four Years before Current Fiscal Year	742,141		742,141		313,553
Prior	831,160		831,160		647,741
Revolving Loans Amortized Cost Basis	1,689,477		1,689,477		1,630,592
Total	6,048,455		6,048,455		5,995,578
Personal Banking Portfolio Segment [Member] | Current to 90 Days Past Due | Personal Real Estate Loan [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	289,567		289,567		455,703
Fiscal Year before Current Fiscal Year	400,647		400,647		452,153
Two Years before Current Fiscal Year	417,239		417,239		533,313
Three Years before Current Fiscal Year	493,672		493,672		711,442
Four Years before Current Fiscal Year	658,047		658,047		257,159
Prior	763,703		763,703		596,439
Revolving Loans Amortized Cost Basis	10,771		10,771		8,620
Total	3,033,646		3,033,646		3,014,829
Personal Banking Portfolio Segment [Member] | Current to 90 Days Past Due | Consumer Loan [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	331,707		331,707		518,619
Fiscal Year before Current Fiscal Year	408,155		408,155		340,104
Two Years before Current Fiscal Year	255,740		255,740		258,348
Three Years before Current Fiscal Year	184,678		184,678		127,208
Four Years before Current Fiscal Year	84,094		84,094		56,394
Prior	67,457		67,457		51,302
Revolving Loans Amortized Cost Basis	772,651		772,651		722,595
Total	2,104,482		2,104,482		2,074,570
Personal Banking Portfolio Segment [Member] | Current to 90 Days Past Due | Revolving home equity
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	339,364		339,364		317,047
Total	339,364		339,364		317,047
Personal Banking Portfolio Segment [Member] | Current to 90 Days Past Due | Credit Card Receivable [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	566,691		566,691		582,330
Total	566,691		566,691		582,330
Personal Banking Portfolio Segment [Member] | Current to 90 Days Past Due | Overdrafts
Credit Quality Indicator [Line Items]
Current Fiscal Year	4,272		4,272		6,802
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	0		0		0
Total	4,272		4,272		6,802
Personal Banking Portfolio Segment [Member] | Over 90 days past due
Credit Quality Indicator [Line Items]
Current Fiscal Year	658		658		3,710
Fiscal Year before Current Fiscal Year	1,726		1,726		1,860
Two Years before Current Fiscal Year	2,058		2,058		2,416
Three Years before Current Fiscal Year	2,044		2,044		858
Four Years before Current Fiscal Year	1,911		1,911		98
Prior	2,247		2,247		1,911
Revolving Loans Amortized Cost Basis	10,846		10,846		10,312
Total	21,490		21,490		21,165
Personal Banking Portfolio Segment [Member] | Over 90 days past due | Personal Real Estate Loan [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	73		73		3,319
Fiscal Year before Current Fiscal Year	1,343		1,343		1,650
Two Years before Current Fiscal Year	1,545		1,545		2,222
Three Years before Current Fiscal Year	1,883		1,883		834
Four Years before Current Fiscal Year	1,795		1,795		44
Prior	1,962		1,962		1,490
Revolving Loans Amortized Cost Basis	0		0		0
Total	8,601		8,601		9,559
Personal Banking Portfolio Segment [Member] | Over 90 days past due | Consumer Loan [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	585		585		391
Fiscal Year before Current Fiscal Year	383		383		210
Two Years before Current Fiscal Year	513		513		194
Three Years before Current Fiscal Year	161		161		24
Four Years before Current Fiscal Year	116		116		54
Prior	285		285		421
Revolving Loans Amortized Cost Basis	1,756		1,756		1,859
Total	3,799		3,799		3,153
Personal Banking Portfolio Segment [Member] | Over 90 days past due | Revolving home equity
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	1,035		1,035		870
Total	1,035		1,035		870
Personal Banking Portfolio Segment [Member] | Over 90 days past due | Credit Card Receivable [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	8,055		8,055		7,583
Total	8,055		8,055		7,583
Personal Banking Portfolio Segment [Member] | Non-Accrual [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		261
Two Years before Current Fiscal Year	85		85		167
Three Years before Current Fiscal Year	113		113		0
Four Years before Current Fiscal Year	0		0		157
Prior	946		946		1,068
Revolving Loans Amortized Cost Basis	1,977		1,977		1,977
Total	3,121		3,121		3,630
Personal Banking Portfolio Segment [Member] | Non-Accrual [Member] | Personal Real Estate Loan [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		261
Two Years before Current Fiscal Year	85		85		167
Three Years before Current Fiscal Year	113		113		0
Four Years before Current Fiscal Year	0		0		157
Prior	946		946		1,068
Revolving Loans Amortized Cost Basis	0		0		0
Total	1,144		1,144		1,653
Personal Banking Portfolio Segment [Member] | Non-Accrual [Member] | Revolving home equity
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	1,977		1,977		1,977
Total	$ 1,977		$ 1,977		$ 1,977