Loans And Allowance For Credit Losses (Credit Quality Indicators Commercial Loan Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Credit Quality Indicator [Line Items]
Loans charged off	$ 11,926	$ 7,230	$ 29,812	$ 21,432
Commercial Portfolio Segment [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	2,262,880		2,262,880		$ 3,096,706
Fiscal Year before Current Fiscal Year	2,756,682		2,756,682		2,060,412
Two Years before Current Fiscal Year	1,628,962		1,628,962		1,219,682
Three Years before Current Fiscal Year	847,512		847,512		834,144
Four Years before Current Fiscal Year	635,882		635,882		393,625
Prior	731,902		731,902		566,436
Revolving Loans Amortized Cost Basis	2,231,244		2,231,244		2,258,796
Total	11,095,064		11,095,064		10,429,801
Loans charged off	2,664	$ 509	3,263	$ 893
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			2,241
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			56
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			41
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			1
Financing Receivable, Revolving, Writeoff			924
Commercial Portfolio Segment [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	1,299,990		1,299,990		1,465,536
Fiscal Year before Current Fiscal Year	956,943		956,943		796,948
Two Years before Current Fiscal Year	617,519		617,519		472,643
Three Years before Current Fiscal Year	324,694		324,694		361,945
Four Years before Current Fiscal Year	282,696		282,696		182,044
Prior	297,042		297,042		233,171
Revolving Loans Amortized Cost Basis	2,129,446		2,129,446		2,149,438
Total	5,908,330		5,908,330		5,661,725
Loans charged off			3,262
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			2,241
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			56
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			41
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Revolving, Writeoff			924
Commercial Portfolio Segment [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	348,509		348,509		538,374
Fiscal Year before Current Fiscal Year	642,958		642,958		615,959
Two Years before Current Fiscal Year	467,912		467,912		129,632
Three Years before Current Fiscal Year	46,827		46,827		27,331
Four Years before Current Fiscal Year	469		469		16,071
Prior	2,984		2,984		15,169
Revolving Loans Amortized Cost Basis	29,907		29,907		18,559
Total	1,539,566		1,539,566		1,361,095
Loans charged off			0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Revolving, Writeoff			0
Commercial Portfolio Segment [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	614,381		614,381		1,092,796
Fiscal Year before Current Fiscal Year	1,156,781		1,156,781		647,505
Two Years before Current Fiscal Year	543,531		543,531		617,407
Three Years before Current Fiscal Year	475,991		475,991		444,868
Four Years before Current Fiscal Year	352,717		352,717		195,510
Prior	431,876		431,876		318,096
Revolving Loans Amortized Cost Basis	71,891		71,891		90,799
Total	3,647,168		3,647,168		3,406,981
Loans charged off			1
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff			0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			1
Financing Receivable, Revolving, Writeoff			0
Commercial Portfolio Segment [Member] | Pass [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	2,232,863		2,232,863		3,079,877
Fiscal Year before Current Fiscal Year	2,704,094		2,704,094		1,995,390
Two Years before Current Fiscal Year	1,568,554		1,568,554		1,149,481
Three Years before Current Fiscal Year	807,277		807,277		812,816
Four Years before Current Fiscal Year	613,955		613,955		345,308
Prior	628,284		628,284		492,661
Revolving Loans Amortized Cost Basis	2,202,818		2,202,818		2,255,738
Total	10,757,845		10,757,845		10,131,271
Commercial Portfolio Segment [Member] | Pass [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	1,277,612		1,277,612		1,456,476
Fiscal Year before Current Fiscal Year	944,231		944,231		782,409
Two Years before Current Fiscal Year	585,620		585,620		464,201
Three Years before Current Fiscal Year	302,672		302,672		360,844
Four Years before Current Fiscal Year	281,949		281,949		180,375
Prior	281,170		281,170		219,053
Revolving Loans Amortized Cost Basis	2,101,284		2,101,284		2,146,380
Total	5,774,538		5,774,538		5,609,738
Commercial Portfolio Segment [Member] | Pass [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	344,977		344,977		538,022
Fiscal Year before Current Fiscal Year	638,963		638,963		596,465
Two Years before Current Fiscal Year	467,912		467,912		129,632
Three Years before Current Fiscal Year	46,827		46,827		27,331
Four Years before Current Fiscal Year	469		469		1,305
Prior	2,984		2,984		2,029
Revolving Loans Amortized Cost Basis	29,907		29,907		18,559
Total	1,532,039		1,532,039		1,313,343
Commercial Portfolio Segment [Member] | Pass [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	610,274		610,274		1,085,379
Fiscal Year before Current Fiscal Year	1,120,900		1,120,900		616,516
Two Years before Current Fiscal Year	515,022		515,022		555,648
Three Years before Current Fiscal Year	457,778		457,778		424,641
Four Years before Current Fiscal Year	331,537		331,537		163,628
Prior	344,130		344,130		271,579
Revolving Loans Amortized Cost Basis	71,627		71,627		90,799
Total	3,451,268		3,451,268		3,208,190
Commercial Portfolio Segment [Member] | Special Mention [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	29,949		29,949		8,073
Fiscal Year before Current Fiscal Year	20,095		20,095		2,548
Two Years before Current Fiscal Year	23,958		23,958		8,375
Three Years before Current Fiscal Year	8,118		8,118		10,800
Four Years before Current Fiscal Year	9,655		9,655		1,043
Prior	3,416		3,416		279
Revolving Loans Amortized Cost Basis	16,783		16,783		1,319
Total	111,974		111,974		32,437
Commercial Portfolio Segment [Member] | Special Mention [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	22,310		22,310		3,113
Fiscal Year before Current Fiscal Year	4,513		4,513		2,548
Two Years before Current Fiscal Year	20,926		20,926		7,757
Three Years before Current Fiscal Year	7,223		7,223		1,063
Four Years before Current Fiscal Year	282		282		67
Prior	2,530		2,530		0
Revolving Loans Amortized Cost Basis	16,783		16,783		1,319
Total	74,567		74,567		15,867
Commercial Portfolio Segment [Member] | Special Mention [Member] | Real estate - construction and land
Credit Quality Indicator [Line Items]
Current Fiscal Year	3,532		3,532		352
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	3,532		3,532		352
Commercial Portfolio Segment [Member] | Special Mention [Member] | Real estate - business
Credit Quality Indicator [Line Items]
Current Fiscal Year	4,107		4,107		4,608
Fiscal Year before Current Fiscal Year	15,582		15,582		0
Two Years before Current Fiscal Year	3,032		3,032		618
Three Years before Current Fiscal Year	895		895		9,737
Four Years before Current Fiscal Year	9,373		9,373		976
Prior	886		886		279
Revolving Loans Amortized Cost Basis	0		0		0
Total	33,875		33,875		16,218
Commercial Portfolio Segment [Member] | Substandard [Member]
Credit Quality Indicator [Line Items]
Current Fiscal Year	68		68		8,547
Fiscal Year before Current Fiscal Year	29,969		29,969		60,442
Two Years before Current Fiscal Year	34,988		34,988		61,826
Three Years before Current Fiscal Year	32,117		32,117		10,527
Four Years before Current Fiscal Year	12,272		12,272		46,358
Prior	97,510		97,510		69,714
Revolving Loans Amortized Cost Basis	11,643		11,643		1,739
Total	218,567		218,567		259,153
Commercial Portfolio Segment [Member] | Substandard [Member] | Business
Credit Quality Indicator [Line Items]
Current Fiscal Year	68		68		5,752
Fiscal Year before Current Fiscal Year	5,675		5,675		10,004
Two Years before Current Fiscal Year	9,511		9,511		685
Three Years before Current Fiscal Year	14,799		14,799		37
Four Years before Current Fiscal Year	465		465		810
Prior	10,726		10,726		10,342
Revolving Loans Amortized Cost Basis	11,379		11,379		1,739
Total	52,623		52,623		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	3,995		3,995		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	3,995		3,995		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	20,299		20,299		30,944
Two Years before Current Fiscal Year	25,477		25,477		61,141
Three Years before Current Fiscal Year	17,318		17,318		10,490
Four Years before Current Fiscal Year	11,807		11,807		30,782
Prior	86,784		86,784		46,232
Revolving Loans Amortized Cost Basis	264		264		0
Total	161,949		161,949		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	2,524		2,524		2,032
Two Years before Current Fiscal Year	1,462		1,462		0
Three Years before Current Fiscal Year	0		0		1
Four Years before Current Fiscal Year	0		0		916
Prior	2,692		2,692		3,782
Revolving Loans Amortized Cost Basis	0		0		0
Total	6,678		6,678		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	2,524		2,524		1,987
Two Years before Current Fiscal Year	1,462		1,462		0
Three Years before Current Fiscal Year	0		0		1
Four Years before Current Fiscal Year	0		0		792
Prior	2,616		2,616		3,776
Revolving Loans Amortized Cost Basis	0		0		0
Total	6,602		6,602		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	0		0		45
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		124
Prior	76		76		6
Revolving Loans Amortized Cost Basis	0		0		0
Total	$ 76		$ 76		$ 189