Loans and Allowance for Credit Losses (Disaggregation of Credit Quality Disclosures) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	$ 4,954,258	$ 5,076,311
Term Loans, Amortized Cost Basis by Origination Year, 2021	3,700,837	3,073,804
Term Loans, Amortized Cost Basis by Origination Year, 2020	2,145,461	2,114,506
Term Loans, Amortized Cost Basis by Origination Year, 2019	1,411,421	1,285,226
Term Loans, Amortized Cost Basis by Origination Year, 2018	834,697	1,003,833
Term Loans, Amortized Cost Basis by Origination Year, Prior	1,626,992	1,385,473
Revolving Loans	3,615,992	3,084,875
Revolving Loans Converted to Term Loans	154,436	102,974
Notes Receivable Gross	18,444,094	17,127,002
Total Commercial [Member] | Pass [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	4,789,035	4,946,459
Term Loans, Amortized Cost Basis by Origination Year, 2021	3,608,540	3,008,160
Term Loans, Amortized Cost Basis by Origination Year, 2020	2,026,017	2,035,849
Term Loans, Amortized Cost Basis by Origination Year, 2019	1,327,839	1,212,306
Term Loans, Amortized Cost Basis by Origination Year, 2018	779,966	937,639
Term Loans, Amortized Cost Basis by Origination Year, Prior	1,539,131	1,296,382
Revolving Loans	3,482,828	3,002,064
Revolving Loans Converted to Term Loans	131,222	80,535
Notes Receivable Gross	17,684,578	16,519,394
Total Commercial [Member] | Pass-Watch [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	84,696	68,421
Term Loans, Amortized Cost Basis by Origination Year, 2021	64,263	19,467
Term Loans, Amortized Cost Basis by Origination Year, 2020	94,484	31,598
Term Loans, Amortized Cost Basis by Origination Year, 2019	46,483	45,846
Term Loans, Amortized Cost Basis by Origination Year, 2018	31,375	27,188
Term Loans, Amortized Cost Basis by Origination Year, Prior	58,567	69,310
Revolving Loans	67,767	52,850
Revolving Loans Converted to Term Loans	9,985	5,714
Notes Receivable Gross	457,620	320,394
Total Commercial [Member] | Special Mention [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	30,511	17,536
Term Loans, Amortized Cost Basis by Origination Year, 2021	13,625	2,683
Term Loans, Amortized Cost Basis by Origination Year, 2020	3,694	10,296
Term Loans, Amortized Cost Basis by Origination Year, 2019	7,749	12,410
Term Loans, Amortized Cost Basis by Origination Year, 2018	1,719	10,669
Term Loans, Amortized Cost Basis by Origination Year, Prior	5,701	3,656
Revolving Loans	25,184	9,603
Revolving Loans Converted to Term Loans	2,070	6,243
Notes Receivable Gross	90,253	73,096
Total Commercial [Member] | Substandard [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	50,016	43,895
Term Loans, Amortized Cost Basis by Origination Year, 2021	14,409	43,494
Term Loans, Amortized Cost Basis by Origination Year, 2020	21,266	36,763
Term Loans, Amortized Cost Basis by Origination Year, 2019	29,350	14,664
Term Loans, Amortized Cost Basis by Origination Year, 2018	21,637	28,337
Term Loans, Amortized Cost Basis by Origination Year, Prior	23,593	16,125
Revolving Loans	40,213	20,358
Revolving Loans Converted to Term Loans	11,159	10,482
Notes Receivable Gross	211,643	214,118
Residential Mortgage and Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	736,331	581,378
Term Loans, Amortized Cost Basis by Origination Year, 2021	754,984	468,448
Term Loans, Amortized Cost Basis by Origination Year, 2020	565,289	357,851
Term Loans, Amortized Cost Basis by Origination Year, 2019	257,100	227,959
Term Loans, Amortized Cost Basis by Origination Year, 2018	151,695	325,063
Term Loans, Amortized Cost Basis by Origination Year, Prior	981,552	916,726
Revolving Loans	1,216,564	1,121,893
Revolving Loans Converted to Term Loans	6,437	7,962
Notes Receivable Gross	4,669,952	4,007,280
Residential Mortgage and Consumer [Member] | Performing [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	735,080	580,813
Term Loans, Amortized Cost Basis by Origination Year, 2021	752,352	467,497
Term Loans, Amortized Cost Basis by Origination Year, 2020	564,345	355,833
Term Loans, Amortized Cost Basis by Origination Year, 2019	255,146	223,494
Term Loans, Amortized Cost Basis by Origination Year, 2018	149,234	320,344
Term Loans, Amortized Cost Basis by Origination Year, Prior	959,409	892,361
Revolving Loans	1,216,105	1,120,461
Revolving Loans Converted to Term Loans	4,834	5,995
Notes Receivable Gross	4,636,505	3,966,798
Residential Mortgage and Consumer [Member] | Nonperforming [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	1,251	565
Term Loans, Amortized Cost Basis by Origination Year, 2021	2,632	951
Term Loans, Amortized Cost Basis by Origination Year, 2020	944	2,018
Term Loans, Amortized Cost Basis by Origination Year, 2019	1,954	4,465
Term Loans, Amortized Cost Basis by Origination Year, 2018	2,461	4,719
Term Loans, Amortized Cost Basis by Origination Year, Prior	22,143	24,365
Revolving Loans	459	1,432
Revolving Loans Converted to Term Loans	1,603	1,967
Notes Receivable Gross	$ 33,447	$ 40,482