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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 31,822,374 | $ 31,123,641
Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 31,822,374 | 31,123,641
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,751,875 | 9,508,904
Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,538,688 | 9,298,624
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 12,908,380 | 12,457,070
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 12,748,339 | 12,298,748
BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 373,228 | 368,602
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,568,666 | 6,460,441
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,568,666 | 6,460,441
Indirect |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,003,287 | 1,034,257
Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,003,287 | 1,034,257
Direct |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 580,726 | 629,186
Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 580,726 | 629,186
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,009,440 | 1,033,783
Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,009,440 | 1,033,783
Total Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 119,996 | 186,223
Total Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 21,193 | 30,028
Total Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 41,563 | 81,444
Total Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 2,600 | 1,698
Total Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 29,530 | 40,967
Total Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 5,881 | 9,378
Total Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,225 | 9,450
Total Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 13,004 | 13,258
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 58,491 | 104,589
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 8,463 | 14,147
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 14,648 | 47,240
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,618 | 730
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 19,495 | 24,181
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 4,229 | 6,302
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,759 | 5,404
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,279 | 6,585
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 8,534 | 17,713
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,397 | 4,801
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 256 | 1,312
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 552 | 365
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 310 | 5,033
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,141 | 2,118
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 955 | 2,118
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,923 | 1,966
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 52,971 | 63,921
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,333 | 11,080
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 26,659 | 32,892
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 430 | 603
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,725 | 11,753
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 511 | 958
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,511 | 1,928
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 4,802 | 4,707
Current | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 31,702,378 | 30,937,418
Current | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,517,495 | 9,268,596
Current | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 12,706,776 | 12,217,304
Current | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 370,628 | 366,904
Current | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,539,136 | 6,419,474
Current | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 997,406 | 1,024,879
Current | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 574,501 | 619,736
Current | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 996,436 | $ 1,020,525

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