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Loans and Allowance for Credit Losses (Disaggregation of Credit Quality Disclosures) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Total Commercial [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2022 | $ 1,384,048 | $ 5,076,311
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 4,644,730 | 3,073,804
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 2,817,198 | 2,114,506
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 1,890,230 | 1,285,226
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 1,139,932 | 1,003,833
Term Loans, Amortized Cost Basis by Origination Year, Prior | 2,170,973 | 1,385,473
Revolving Loans | 3,174,966 | 3,084,875
Revolving Loans Converted to Term Loans | 80,590 | 102,974
Notes Receivable Gross | 17,302,667 | 17,127,002
Total Commercial [Member] | Pass [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2022 | 1,326,731 | 4,946,459
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 4,549,370 | 3,008,160
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 2,750,447 | 2,035,849
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 1,801,058 | 1,212,306
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 1,068,711 | 937,639
Term Loans, Amortized Cost Basis by Origination Year, Prior | 2,043,133 | 1,296,382
Revolving Loans | 3,072,931 | 3,002,064
Revolving Loans Converted to Term Loans | 74,369 | 80,535
Notes Receivable Gross | 16,686,749 | 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 | 21,757 | 68,421
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 57,011 | 19,467
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 24,746 | 31,598
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 42,969 | 45,846
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 43,367 | 27,188
Term Loans, Amortized Cost Basis by Origination Year, Prior | 79,352 | 69,310
Revolving Loans | 59,453 | 52,850
Revolving Loans Converted to Term Loans | 4,792 | 5,714
Notes Receivable Gross | 333,448 | 320,394
Total Commercial [Member] | Special Mention [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2022 | 4,110 | 17,536
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 13,566 | 2,683
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 5,128 | 10,296
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 8,612 | 12,410
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 12,472 | 10,669
Term Loans, Amortized Cost Basis by Origination Year, Prior | 12,378 | 3,656
Revolving Loans | 19,536 | 9,603
Revolving Loans Converted to Term Loans | 456 | 6,243
Notes Receivable Gross | 76,258 | 73,096
Total Commercial [Member] | Substandard [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2022 | 31,450 | 43,895
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 24,783 | 43,494
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 36,877 | 36,763
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 37,591 | 14,664
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 15,382 | 28,337
Term Loans, Amortized Cost Basis by Origination Year, Prior | 36,110 | 16,125
Revolving Loans | 23,046 | 20,358
Revolving Loans Converted to Term Loans | 973 | 10,482
Notes Receivable Gross | 206,212 | 214,118
Residential Mortgage and Consumer [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2022 | 170,573 | 581,378
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 558,585 | 468,448
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 488,024 | 357,851
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 316,620 | 227,959
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 200,774 | 325,063
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,157,086 | 916,726
Revolving Loans | 1,124,197 | 1,121,893
Revolving Loans Converted to Term Loans | 4,815 | 7,962
Notes Receivable Gross | 4,020,674 | 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 | 170,543 | 580,813
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 557,335 | 467,497
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 486,997 | 355,833
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 314,321 | 223,494
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 197,414 | 320,344
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,131,990 | 892,361
Revolving Loans | 1,123,451 | 1,120,461
Revolving Loans Converted to Term Loans | 4,492 | 5,995
Notes Receivable Gross | 3,986,543 | 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 | 30 | 565
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 1,250 | 951
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 1,027 | 2,018
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 2,299 | 4,465
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 3,360 | 4,719
Term Loans, Amortized Cost Basis by Origination Year, Prior | 25,096 | 24,365
Revolving Loans | 746 | 1,432
Revolving Loans Converted to Term Loans | 323 | 1,967
Notes Receivable Gross | $ 34,131 | $ 40,482

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