Loans And Allowance For Credit Losses (Credit Quality Indicators Commercial Loan Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Credit Quality Indicator [Line Items]
Loans charged off	$ 8,838	$ 6,740	$ 17,886	$ 14,202
Commercial Portfolio Segment [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	1,871,434		1,871,434		$ 3,096,706
Fiscal Year before Current Fiscal Year	2,833,496		2,833,496		2,060,412
Two Years before Current Fiscal Year	1,721,395		1,721,395		1,219,682
Three Years before Current Fiscal Year	915,229		915,229		834,144
Four Years before Current Fiscal Year	708,098		708,098		393,625
Prior	791,527		791,527		566,436
Revolving Loans Amortized Cost Basis	2,138,319		2,138,319		2,258,796
Total	10,979,498		10,979,498		10,429,801
Loans charged off	307	$ 207	599	$ 384
Financing Receivable, Revolving, Writeoff			558
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			41
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0
Commercial Portfolio Segment [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	1,159,621		1,159,621		1,465,536
Fiscal Year before Current Fiscal Year	1,075,104		1,075,104		796,948
Two Years before Current Fiscal Year	664,119		664,119		472,643
Three Years before Current Fiscal Year	349,113		349,113		361,945
Four Years before Current Fiscal Year	304,529		304,529		182,044
Prior	333,104		333,104		233,171
Revolving Loans Amortized Cost Basis	2,020,903		2,020,903		2,149,438
Total	5,906,493		5,906,493		5,661,725
Loans charged off			599
Financing Receivable, Revolving, Writeoff			558
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			41
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0
Commercial Portfolio Segment [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	228,564		228,564		538,374
Fiscal Year before Current Fiscal Year	594,720		594,720		615,959
Two Years before Current Fiscal Year	497,885		497,885		129,632
Three Years before Current Fiscal Year	66,877		66,877		27,331
Four Years before Current Fiscal Year	27,103		27,103		16,071
Prior	3,102		3,102		15,169
Revolving Loans Amortized Cost Basis	33,532		33,532		18,559
Total	1,451,783		1,451,783		1,361,095
Loans charged off			0
Financing Receivable, Revolving, Writeoff			0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0
Commercial Portfolio Segment [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	483,249		483,249		1,092,796
Fiscal Year before Current Fiscal Year	1,163,672		1,163,672		647,505
Two Years before Current Fiscal Year	559,391		559,391		617,407
Three Years before Current Fiscal Year	499,239		499,239		444,868
Four Years before Current Fiscal Year	376,466		376,466		195,510
Prior	455,321		455,321		318,096
Revolving Loans Amortized Cost Basis	83,884		83,884		90,799
Total	3,621,222		3,621,222		3,406,981
Loans charged off			0
Financing Receivable, Revolving, Writeoff			0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0
Commercial Portfolio Segment [Member] | Pass [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	1,841,452		1,841,452		3,079,877
Fiscal Year before Current Fiscal Year	2,790,636		2,790,636		1,995,390
Two Years before Current Fiscal Year	1,656,590		1,656,590		1,149,481
Three Years before Current Fiscal Year	873,771		873,771		812,816
Four Years before Current Fiscal Year	685,781		685,781		345,308
Prior	684,733		684,733		492,661
Revolving Loans Amortized Cost Basis	2,118,019		2,118,019		2,255,738
Total	10,650,982		10,650,982		10,131,271
Commercial Portfolio Segment [Member] | Pass [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	1,136,860		1,136,860		1,456,476
Fiscal Year before Current Fiscal Year	1,058,237		1,058,237		782,409
Two Years before Current Fiscal Year	631,119		631,119		464,201
Three Years before Current Fiscal Year	325,640		325,640		360,844
Four Years before Current Fiscal Year	303,589		303,589		180,375
Prior	315,781		315,781		219,053
Revolving Loans Amortized Cost Basis	2,001,024		2,001,024		2,146,380
Total	5,772,250		5,772,250		5,609,738
Commercial Portfolio Segment [Member] | Pass [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	221,343		221,343		538,022
Fiscal Year before Current Fiscal Year	590,385		590,385		596,465
Two Years before Current Fiscal Year	497,885		497,885		129,632
Three Years before Current Fiscal Year	66,877		66,877		27,331
Four Years before Current Fiscal Year	27,103		27,103		1,305
Prior	3,102		3,102		2,029
Revolving Loans Amortized Cost Basis	33,532		33,532		18,559
Total	1,440,227		1,440,227		1,313,343
Commercial Portfolio Segment [Member] | Pass [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	483,249		483,249		1,085,379
Fiscal Year before Current Fiscal Year	1,142,014		1,142,014		616,516
Two Years before Current Fiscal Year	527,586		527,586		555,648
Three Years before Current Fiscal Year	481,254		481,254		424,641
Four Years before Current Fiscal Year	355,089		355,089		163,628
Prior	365,850		365,850		271,579
Revolving Loans Amortized Cost Basis	83,463		83,463		90,799
Total	3,438,505		3,438,505		3,208,190
Commercial Portfolio Segment [Member] | Special Mention [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	29,911		29,911		8,073
Fiscal Year before Current Fiscal Year	12,407		12,407		2,548
Two Years before Current Fiscal Year	22,451		22,451		8,375
Three Years before Current Fiscal Year	8,820		8,820		10,800
Four Years before Current Fiscal Year	9,948		9,948		1,043
Prior	5,390		5,390		279
Revolving Loans Amortized Cost Basis	6,394		6,394		1,319
Total	95,321		95,321		32,437
Commercial Portfolio Segment [Member] | Special Mention [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	22,690		22,690		3,113
Fiscal Year before Current Fiscal Year	4,981		4,981		2,548
Two Years before Current Fiscal Year	21,536		21,536		7,757
Three Years before Current Fiscal Year	7,692		7,692		1,063
Four Years before Current Fiscal Year	456		456		67
Prior	4,067		4,067		0
Revolving Loans Amortized Cost Basis	5,994		5,994		1,319
Total	67,416		67,416		15,867
Commercial Portfolio Segment [Member] | Special Mention [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	7,221		7,221		352
Fiscal Year before Current Fiscal Year	269		269		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	7,490		7,490		352
Commercial Portfolio Segment [Member] | Special Mention [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		4,608
Fiscal Year before Current Fiscal Year	7,157		7,157		0
Two Years before Current Fiscal Year	915		915		618
Three Years before Current Fiscal Year	1,128		1,128		9,737
Four Years before Current Fiscal Year	9,492		9,492		976
Prior	1,323		1,323		279
Revolving Loans Amortized Cost Basis	400		400		0
Total	20,415		20,415		16,218
Commercial Portfolio Segment [Member] | Substandard [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	71		71		8,547
Fiscal Year before Current Fiscal Year	30,381		30,381		60,442
Two Years before Current Fiscal Year	40,604		40,604		61,826
Three Years before Current Fiscal Year	32,605		32,605		10,527
Four Years before Current Fiscal Year	12,369		12,369		46,358
Prior	98,374		98,374		69,714
Revolving Loans Amortized Cost Basis	13,906		13,906		1,739
Total	228,310		228,310		259,153
Commercial Portfolio Segment [Member] | Substandard [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	71		71		5,752
Fiscal Year before Current Fiscal Year	11,828		11,828		10,004
Two Years before Current Fiscal Year	9,759		9,759		685
Three Years before Current Fiscal Year	15,748		15,748		37
Four Years before Current Fiscal Year	484		484		810
Prior	10,320		10,320		10,342
Revolving Loans Amortized Cost Basis	13,885		13,885		1,739
Total	62,095		62,095		29,369
Commercial Portfolio Segment [Member] | Substandard [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		0
Fiscal Year before Current Fiscal Year	4,066		4,066		19,494
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		14,766
Prior	0		0		13,140
Revolving Loans Amortized Cost Basis	0		0		0
Total	4,066		4,066		47,400
Commercial Portfolio Segment [Member] | Substandard [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		2,795
Fiscal Year before Current Fiscal Year	14,487		14,487		30,944
Two Years before Current Fiscal Year	30,845		30,845		61,141
Three Years before Current Fiscal Year	16,857		16,857		10,490
Four Years before Current Fiscal Year	11,885		11,885		30,782
Prior	88,054		88,054		46,232
Revolving Loans Amortized Cost Basis	21		21		0
Total	162,149		162,149		182,384
Commercial Portfolio Segment [Member] | Non-Accrual [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		209
Fiscal Year before Current Fiscal Year	72		72		2,032
Two Years before Current Fiscal Year	1,750		1,750		0
Three Years before Current Fiscal Year	33		33		1
Four Years before Current Fiscal Year	0		0		916
Prior	3,030		3,030		3,782
Revolving Loans Amortized Cost Basis	0		0		0
Total	4,885		4,885		6,940
Commercial Portfolio Segment [Member] | Non-Accrual [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		195
Fiscal Year before Current Fiscal Year	58		58		1,987
Two Years before Current Fiscal Year	1,705		1,705		0
Three Years before Current Fiscal Year	33		33		1
Four Years before Current Fiscal Year	0		0		792
Prior	2,936		2,936		3,776
Revolving Loans Amortized Cost Basis	0		0		0
Total	4,732		4,732		6,751
Commercial Portfolio Segment [Member] | Non-Accrual [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	0		0		14
Fiscal Year before Current Fiscal Year	14		14		45
Two Years before Current Fiscal Year	45		45		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		124
Prior	94		94		6
Revolving Loans Amortized Cost Basis	0		0		0
Total	$ 153		$ 153		$ 189