Loans and Allowance for Credit Losses (Disaggregation of Credit Quality Disclosures) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	$ 2,736,774	$ 5,076,311
Term Loans, Amortized Cost Basis by Origination Year, 2021	4,167,782	3,073,804
Term Loans, Amortized Cost Basis by Origination Year, 2020	2,560,873	2,114,506
Term Loans, Amortized Cost Basis by Origination Year, 2019	1,769,169	1,285,226
Term Loans, Amortized Cost Basis by Origination Year, 2018	996,340	1,003,833
Term Loans, Amortized Cost Basis by Origination Year, Prior	1,990,171	1,385,473
Revolving Loans	3,293,586	3,084,875
Revolving Loans Converted to Term Loans	144,841	102,974
Notes Receivable Gross	17,659,536	17,127,002
Total Commercial [Member] | Pass [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	2,647,233	4,946,459
Term Loans, Amortized Cost Basis by Origination Year, 2021	4,097,352	3,008,160
Term Loans, Amortized Cost Basis by Origination Year, 2020	2,496,832	2,035,849
Term Loans, Amortized Cost Basis by Origination Year, 2019	1,688,087	1,212,306
Term Loans, Amortized Cost Basis by Origination Year, 2018	930,288	937,639
Term Loans, Amortized Cost Basis by Origination Year, Prior	1,882,405	1,296,382
Revolving Loans	3,151,983	3,002,064
Revolving Loans Converted to Term Loans	132,146	80,535
Notes Receivable Gross	17,026,326	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	32,871	68,421
Term Loans, Amortized Cost Basis by Origination Year, 2021	39,597	19,467
Term Loans, Amortized Cost Basis by Origination Year, 2020	41,917	31,598
Term Loans, Amortized Cost Basis by Origination Year, 2019	37,494	45,846
Term Loans, Amortized Cost Basis by Origination Year, 2018	38,875	27,188
Term Loans, Amortized Cost Basis by Origination Year, Prior	62,750	69,310
Revolving Loans	92,695	52,850
Revolving Loans Converted to Term Loans	5,983	5,714
Notes Receivable Gross	352,182	320,394
Total Commercial [Member] | Special Mention [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	29,654	17,536
Term Loans, Amortized Cost Basis by Origination Year, 2021	11,833	2,683
Term Loans, Amortized Cost Basis by Origination Year, 2020	8,346	10,296
Term Loans, Amortized Cost Basis by Origination Year, 2019	4,411	12,410
Term Loans, Amortized Cost Basis by Origination Year, 2018	10,083	10,669
Term Loans, Amortized Cost Basis by Origination Year, Prior	15,097	3,656
Revolving Loans	18,722	9,603
Revolving Loans Converted to Term Loans	1,563	6,243
Notes Receivable Gross	99,709	73,096
Total Commercial [Member] | Substandard [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	27,016	43,895
Term Loans, Amortized Cost Basis by Origination Year, 2021	19,000	43,494
Term Loans, Amortized Cost Basis by Origination Year, 2020	13,778	36,763
Term Loans, Amortized Cost Basis by Origination Year, 2019	39,177	14,664
Term Loans, Amortized Cost Basis by Origination Year, 2018	17,094	28,337
Term Loans, Amortized Cost Basis by Origination Year, Prior	29,919	16,125
Revolving Loans	30,186	20,358
Revolving Loans Converted to Term Loans	5,149	10,482
Notes Receivable Gross	181,319	214,118
Residential Mortgage and Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	350,968	581,378
Term Loans, Amortized Cost Basis by Origination Year, 2021	602,562	468,448
Term Loans, Amortized Cost Basis by Origination Year, 2020	518,932	357,851
Term Loans, Amortized Cost Basis by Origination Year, 2019	290,670	227,959
Term Loans, Amortized Cost Basis by Origination Year, 2018	176,098	325,063
Term Loans, Amortized Cost Basis by Origination Year, Prior	1,073,416	916,726
Revolving Loans	1,169,158	1,121,893
Revolving Loans Converted to Term Loans	4,728	7,962
Notes Receivable Gross	4,186,532	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	350,898	580,813
Term Loans, Amortized Cost Basis by Origination Year, 2021	601,109	467,497
Term Loans, Amortized Cost Basis by Origination Year, 2020	518,412	355,833
Term Loans, Amortized Cost Basis by Origination Year, 2019	288,601	223,494
Term Loans, Amortized Cost Basis by Origination Year, 2018	173,446	320,344
Term Loans, Amortized Cost Basis by Origination Year, Prior	1,051,413	892,361
Revolving Loans	1,168,323	1,120,461
Revolving Loans Converted to Term Loans	4,035	5,995
Notes Receivable Gross	4,156,237	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	70	565
Term Loans, Amortized Cost Basis by Origination Year, 2021	1,453	951
Term Loans, Amortized Cost Basis by Origination Year, 2020	520	2,018
Term Loans, Amortized Cost Basis by Origination Year, 2019	2,069	4,465
Term Loans, Amortized Cost Basis by Origination Year, 2018	2,652	4,719
Term Loans, Amortized Cost Basis by Origination Year, Prior	22,003	24,365
Revolving Loans	835	1,432
Revolving Loans Converted to Term Loans	693	1,967
Notes Receivable Gross	$ 30,295	$ 40,482