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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 32,577,834 | $ 31,123,641
Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 32,577,834 | 31,123,641
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,333,448 | 9,508,904
Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,107,095 | 9,298,624
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 13,916,221 | 12,457,070
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 13,750,628 | 12,298,748
BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 391,946 | 368,602
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,696,288 | 6,460,441
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,696,288 | 6,460,441
Indirect |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,047,224 | 1,034,257
Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,047,224 | 1,034,257
Direct |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 542,689 | 629,186
Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 542,689 | 629,186
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,041,964 | 1,033,783
Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,041,964 | 1,033,783
Total Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 142,960 | 186,223
Total Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 19,472 | 30,028
Total Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 43,615 | 81,444
Total Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 2,496 | 1,698
Total Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 49,279 | 40,967
Total Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 8,100 | 9,378
Total Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,273 | 9,450
Total Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 13,725 | 13,258
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 64,785 | 104,589
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 2,754 | 14,147
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 15,954 | 47,240
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,273 | 730
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 29,762 | 24,181
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 5,576 | 6,302
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,626 | 5,404
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 5,840 | 6,585
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 22,039 | 17,713
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 4,214 | 4,801
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,295 | 1,312
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 511 | 365
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,784 | 5,033
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,368 | 2,118
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,059 | 2,118
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,808 | 1,966
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 56,136 | 63,921
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 12,504 | 11,080
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 21,366 | 32,892
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 712 | 603
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 12,733 | 11,753
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,156 | 958
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,588 | 1,928
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,077 | 4,707
Current | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 32,434,874 | 30,937,418
Current | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,087,623 | 9,268,596
Current | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 13,707,013 | 12,217,304
Current | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 389,450 | 366,904
Current | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6,647,009 | 6,419,474
Current | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,039,124 | 1,024,879
Current | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 536,416 | 619,736
Current | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 1,028,239 | $ 1,020,525

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