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Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | $ 32,577,834 |  | $ 31,123,641 |  |  |
Allowance for credit losses on loans | (303,982) | $ (300,555) | (303,671) | $ (302,254) | $ (288,003) | $ (107,341)
Net loans | 32,273,852 |  | 30,819,970 |  |  |
Portfolio Segment Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 0 |  | 0 |  |  |
After Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 32,577,834 |  | 31,123,641 |  |  |
Allowance for credit losses on loans | (303,982) |  | (303,671) |  |  |
Net loans | 32,273,852 |  | 30,819,970 |  |  |
Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 9,333,448 |  | 9,508,904 |  |  |
Allowance for credit losses on loans | (124,755) | (127,403) | (120,612) | (112,413) | (102,819) | (27,232)
Commercial | Portfolio Segment Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (226,353) |  | (210,280) |  |  |
Commercial | After Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 9,107,095 |  | 9,298,624 |  |  |
Commercial real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 13,916,221 |  | 12,457,070 |  |  |
Allowance for credit losses on loans | (144,975) | (136,897) | (138,244) | (144,090) | (141,802) | (64,004)
Commercial real estate | Portfolio Segment Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (165,593) |  | (158,322) |  |  |
Commercial real estate | After Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 13,750,628 |  | 12,298,748 |  |  |
BBCC |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans | (2,709) | (2,776) | (2,431) | (2,168) | (2,064) | (2,458)
BBCC | Portfolio Segment Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 391,946 |  | 368,602 |  |  |
BBCC | After Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 391,946 |  | 368,602 |  |  |
Residential real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 6,696,288 |  | 6,460,441 |  |  |
Allowance for credit losses on loans | (20,780) | (20,421) | (21,916) | (21,256) | (19,729) | (9,347)
Residential real estate | Portfolio Segment Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 0 |  | 0 |  |  |
Residential real estate | After Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 6,696,288 |  | 6,460,441 |  |  |
Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 2,631,877 |  | 2,697,226 |  |  |
Consumer | Portfolio Segment Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (2,631,877) |  | (2,697,226) |  |  |
Indirect |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,047,224 |  | 1,034,257 |  |  |
Allowance for credit losses on loans | (1,321) | (1,407) | (1,532) | (1,585) | (1,641) | (1,743)
Indirect | Portfolio Segment Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,047,224 |  | 1,034,257 |  |  |
Indirect | After Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,047,224 |  | 1,034,257 |  |  |
Direct |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 542,689 |  | 629,186 |  |  |
Allowance for credit losses on loans | (3,571) | (4,755) | (12,116) | (16,096) | (14,412) | (528)
Direct | Portfolio Segment Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 542,689 |  | 629,186 |  |  |
Direct | After Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 542,689 |  | 629,186 |  |  |
Home equity |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,041,964 |  | 1,033,783 |  |  |
Allowance for credit losses on loans | (5,871) | $ (6,896) | (6,820) | $ (4,646) | $ (5,536) | $ (2,029)
Home equity | Portfolio Segment Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,041,964 |  | 1,033,783 |  |  |
Home equity | After Reclassifications |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,041,964 |  | 1,033,783 |  |  |
Direct Finance Leases |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | $ 173,000 |  | $ 188,100 |  |  |

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