Loans and Allowance for Credit Losses (Disaggregation of Credit Quality Disclosures) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	$ 3,894,188	$ 5,076,311
Term Loans, Amortized Cost Basis by Origination Year, 2021	3,938,641	3,073,804
Term Loans, Amortized Cost Basis by Origination Year, 2020	2,391,137	2,114,506
Term Loans, Amortized Cost Basis by Origination Year, 2019	1,620,517	1,285,226
Term Loans, Amortized Cost Basis by Origination Year, 2018	916,732	1,003,833
Term Loans, Amortized Cost Basis by Origination Year, Prior	1,798,084	1,385,473
Revolving Loans	3,483,719	3,084,875
Revolving Loans Converted to Term Loans	123,339	102,974
Notes Receivable Gross	18,166,357	17,127,002
Total Commercial [Member] | Pass [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	3,769,590	4,946,459
Term Loans, Amortized Cost Basis by Origination Year, 2021	3,810,862	3,008,160
Term Loans, Amortized Cost Basis by Origination Year, 2020	2,297,865	2,035,849
Term Loans, Amortized Cost Basis by Origination Year, 2019	1,537,650	1,212,306
Term Loans, Amortized Cost Basis by Origination Year, 2018	854,345	937,639
Term Loans, Amortized Cost Basis by Origination Year, Prior	1,695,383	1,296,382
Revolving Loans	3,355,846	3,002,064
Revolving Loans Converted to Term Loans	99,165	80,535
Notes Receivable Gross	17,420,706	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	42,903	68,421
Term Loans, Amortized Cost Basis by Origination Year, 2021	94,955	19,467
Term Loans, Amortized Cost Basis by Origination Year, 2020	52,211	31,598
Term Loans, Amortized Cost Basis by Origination Year, 2019	48,653	45,846
Term Loans, Amortized Cost Basis by Origination Year, 2018	37,491	27,188
Term Loans, Amortized Cost Basis by Origination Year, Prior	71,871	69,310
Revolving Loans	73,217	52,850
Revolving Loans Converted to Term Loans	19,956	5,714
Notes Receivable Gross	441,257	320,394
Total Commercial [Member] | Special Mention [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	32,940	17,536
Term Loans, Amortized Cost Basis by Origination Year, 2021	11,387	2,683
Term Loans, Amortized Cost Basis by Origination Year, 2020	26,631	10,296
Term Loans, Amortized Cost Basis by Origination Year, 2019	3,732	12,410
Term Loans, Amortized Cost Basis by Origination Year, 2018	1,507	10,669
Term Loans, Amortized Cost Basis by Origination Year, Prior	5,787	3,656
Revolving Loans	5,814	9,603
Revolving Loans Converted to Term Loans	30	6,243
Notes Receivable Gross	87,828	73,096
Total Commercial [Member] | Substandard [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	48,755	43,895
Term Loans, Amortized Cost Basis by Origination Year, 2021	21,437	43,494
Term Loans, Amortized Cost Basis by Origination Year, 2020	14,430	36,763
Term Loans, Amortized Cost Basis by Origination Year, 2019	30,482	14,664
Term Loans, Amortized Cost Basis by Origination Year, 2018	23,389	28,337
Term Loans, Amortized Cost Basis by Origination Year, Prior	25,043	16,125
Revolving Loans	48,842	20,358
Revolving Loans Converted to Term Loans	4,188	10,482
Notes Receivable Gross	216,566	214,118
Residential Mortgage and Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	550,250	581,378
Term Loans, Amortized Cost Basis by Origination Year, 2021	664,564	468,448
Term Loans, Amortized Cost Basis by Origination Year, 2020	544,897	357,851
Term Loans, Amortized Cost Basis by Origination Year, 2019	273,996	227,959
Term Loans, Amortized Cost Basis by Origination Year, 2018	163,439	325,063
Term Loans, Amortized Cost Basis by Origination Year, Prior	1,020,517	916,726
Revolving Loans	1,196,521	1,121,893
Revolving Loans Converted to Term Loans	5,044	7,962
Notes Receivable Gross	4,419,228	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	549,415	580,813
Term Loans, Amortized Cost Basis by Origination Year, 2021	662,455	467,497
Term Loans, Amortized Cost Basis by Origination Year, 2020	543,996	355,833
Term Loans, Amortized Cost Basis by Origination Year, 2019	272,160	223,494
Term Loans, Amortized Cost Basis by Origination Year, 2018	161,093	320,344
Term Loans, Amortized Cost Basis by Origination Year, Prior	997,873	892,361
Revolving Loans	1,195,933	1,120,461
Revolving Loans Converted to Term Loans	4,002	5,995
Notes Receivable Gross	4,386,927	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	835	565
Term Loans, Amortized Cost Basis by Origination Year, 2021	2,109	951
Term Loans, Amortized Cost Basis by Origination Year, 2020	901	2,018
Term Loans, Amortized Cost Basis by Origination Year, 2019	1,836	4,465
Term Loans, Amortized Cost Basis by Origination Year, 2018	2,346	4,719
Term Loans, Amortized Cost Basis by Origination Year, Prior	22,644	24,365
Revolving Loans	588	1,432
Revolving Loans Converted to Term Loans	1,042	1,967
Notes Receivable Gross	$ 32,301	$ 40,482