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Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | $ 31,822,374 | $ 31,123,641 |  |
Allowance for credit losses on loans | (298,711) | (303,671) | $ (280,507) | $ (107,341)
Net loans | 31,523,663 | 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 | 31,822,374 | 31,123,641 |  |
Allowance for credit losses on loans | (298,711) | (303,671) |  |
Net loans | 31,523,663 | 30,819,970 |  |
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 9,751,875 | 9,508,904 |  |
Allowance for credit losses on loans | (125,768) | (120,612) | (99,471) | (27,232)
Commercial | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | (213,187) | (210,280) |  |
Commercial | After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 9,538,688 | 9,298,624 |  |
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 12,908,380 | 12,457,070 |  |
Allowance for credit losses on loans | (135,348) | (138,244) | (140,490) | (64,004)
Commercial real estate | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | (160,041) | (158,322) |  |
Commercial real estate | After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 12,748,339 | 12,298,748 |  |
BBCC |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for credit losses on loans | (2,316) | (2,431) | (2,069) | (2,458)
BBCC | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 373,228 | 368,602 |  |
BBCC | After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 373,228 | 368,602 |  |
Residential real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 6,568,666 | 6,460,441 |  |
Allowance for credit losses on loans | (20,207) | (21,916) | (17,252) | (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 | 6,568,666 | 6,460,441 |  |
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 2,593,453 | 2,697,226 |  |
Consumer | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | (2,593,453) | (2,697,226) |  |
Indirect |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 1,003,287 | 1,034,257 |  |
Allowance for credit losses on loans | (1,434) | (1,532) | (1,648) | (1,743)
Indirect | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 1,003,287 | 1,034,257 |  |
Indirect | After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 1,003,287 | 1,034,257 |  |
Direct |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 580,726 | 629,186 |  |
Allowance for credit losses on loans | (6,766) | (12,116) | (14,450) | (528)
Direct | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 580,726 | 629,186 |  |
Direct | After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 580,726 | 629,186 |  |
Home equity |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 1,009,440 | 1,033,783 |  |
Allowance for credit losses on loans | (6,872) | (6,820) | $ (5,127) | $ (2,029)
Home equity | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 1,009,440 | 1,033,783 |  |
Home equity | After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 1,009,440 | 1,033,783 |  |
Direct Finance Leases |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | $ 178,700 | $ 188,100 |  |

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