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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 32,432,473 | $ 31,123,641
Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 32,432,473 | 31,123,641
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,698,241 | 9,508,904
Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,470,827 | 9,298,624
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 13,450,209 | 12,457,070
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 13,287,368 | 12,298,748
BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 390,255 | 368,602
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,684,480 | 6,460,441
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,684,480 | 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 | 565,950 | 629,186
Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 565,950 | 629,186
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,030,306 | 1,033,783
Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,030,306 | 1,033,783
Total Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 137,223 | 186,223
Total Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 23,021 | 30,028
Total Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 54,107 | 81,444
Total Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,789 | 1,698
Total Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 34,024 | 40,967
Total Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,298 | 9,378
Total Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 5,257 | 9,450
Total Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 12,727 | 13,258
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 45,690 | 104,589
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 4,164 | 14,147
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 7,760 | 47,240
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 868 | 730
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 18,543 | 24,181
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 4,296 | 6,302
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,225 | 5,404
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,834 | 6,585
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 22,767 | 17,713
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,719 | 4,801
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 10,441 | 1,312
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 847 | 365
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 4,350 | 5,033
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,162 | 2,118
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 775 | 2,118
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,473 | 1,966
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 68,766 | 63,921
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 15,138 | 11,080
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 35,906 | 32,892
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 74 | 603
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 11,131 | 11,753
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 840 | 958
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,257 | 1,928
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 4,420 | 4,707
Current | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 32,295,250 | 30,937,418
Current | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,447,806 | 9,268,596
Current | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 13,233,261 | 12,217,304
Current | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 388,466 | 366,904
Current | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,650,456 | 6,419,474
Current | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 996,989 | 1,024,879
Current | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 560,693 | 619,736
Current | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 1,017,579 | $ 1,020,525

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