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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, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | $ 30,528,933 |  | $ 13,601,846 |  |  |
Allowance for credit losses | (302,254) | $ (288,003) | (107,341) | $ (107,868) | $ (109,444) | $ (131,388)
Net loans | 30,226,679 |  | 13,494,505 |  |  |
Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 0 |  | 0 |  |  |
Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 30,528,933 |  | 13,601,846 |  |  |
Allowance for credit losses | (302,254) |  | (107,341) |  |  |
Net loans | 30,226,679 |  | 13,494,505 |  |  |
Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 9,311,148 |  | 3,391,769 |  |  |
Allowance for credit losses | (112,413) | (102,819) | (27,232) | (26,160) | (25,731) | (30,567)
Commercial | PPP Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 43,500 |  | 169,000 |  |  |
Commercial | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (197,169) |  | (191,557) |  |  |
Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 9,113,979 |  | 3,200,212 |  |  |
Commercial real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 12,227,888 |  | 6,380,674 |  |  |
Allowance for credit losses | (144,090) | (141,802) | (64,004) | (65,097) | (65,469) | (75,810)
Commercial real estate | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (153,784) |  | (159,190) |  |  |
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 12,074,104 |  | 6,221,484 |  |  |
BBCC |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses | (2,168) | (2,064) | (2,458) | (2,562) | (2,798) | (6,120)
BBCC | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 350,953 |  | 350,747 |  |  |
BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 350,953 |  | 350,747 |  |  |
Residential real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 6,267,306 |  | 2,255,289 |  |  |
Allowance for credit losses | (21,256) | (19,729) | (9,347) | (9,526) | (10,419) | (12,608)
Residential real estate | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 0 |  | 0 |  |  |
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 6,267,306 |  | 2,255,289 |  |  |
Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 2,722,591 |  | 1,574,114 |  |  |
Consumer | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (2,722,591) |  | (1,574,114) |  |  |
Indirect |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,004,054 |  | 873,139 |  |  |
Allowance for credit losses | (1,585) | (1,641) | (1,743) | (1,861) | (2,043) | (3,580)
Indirect | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,004,054 |  | 873,139 |  |  |
Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,004,054 |  | 873,139 |  |  |
Direct |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 674,943 |  | 140,385 |  |  |
Allowance for credit losses | (16,096) | (14,412) | (528) | (586) | (640) | (855)
Direct | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 674,943 |  | 140,385 |  |  |
Direct | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 674,943 |  | 140,385 |  |  |
Home equity |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,043,594 |  | 560,590 |  |  |
Allowance for credit losses | (4,646) | $ (5,536) | (2,029) | $ (2,076) | $ (2,344) | $ (1,848)
Home equity | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,043,594 |  | 560,590 |  |  |
Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,043,594 |  | 560,590 |  |  |
Direct Finance Leases |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | $ 196,700 |  | $ 25,100 |  |  |

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