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Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | $ 29,553,648 |  | $ 13,601,846 |  |  |
Allowance for credit losses | (288,003) | $ (280,507) | (107,341) | $ (109,444) | $ (114,037) | $ (131,388)
Net loans | 29,265,645 |  | 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 | 29,553,648 |  | 13,601,846 |  |  |
Allowance for credit losses | (288,003) |  | (107,341) |  |  |
Net loans | 29,265,645 |  | 13,494,505 |  |  |
Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 8,923,983 |  | 3,391,769 |  |  |
Allowance for credit losses | (102,819) | (99,471) | (27,232) | (25,731) | (25,130) | (30,567)
Commercial | PPP Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 81,600 |  | 169,000 |  |  |
Commercial | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (191,996) |  | (191,557) |  |  |
Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 8,731,987 |  | 3,200,212 |  |  |
Commercial real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 11,796,503 |  | 6,380,674 |  |  |
Allowance for credit losses | (141,802) | (140,490) | (64,004) | (65,469) | (70,561) | (75,810)
Commercial real estate | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (154,769) |  | (159,190) |  |  |
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 11,641,734 |  | 6,221,484 |  |  |
BBCC |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses | (2,064) | (2,069) | (2,458) | (2,798) | (2,537) | (6,120)
BBCC | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 346,765 |  | 350,747 |  |  |
BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 346,765 |  | 350,747 |  |  |
Residential real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 6,079,057 |  | 2,255,289 |  |  |
Allowance for credit losses | (19,729) | (17,252) | (9,347) | (10,419) | (10,265) | (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 | 6,079,057 |  | 2,255,289 |  |  |
Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 2,754,105 |  | 1,574,114 |  |  |
Consumer | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (2,754,105) |  | (1,574,114) |  |  |
Indirect |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 981,741 |  | 873,139 |  |  |
Allowance for credit losses | (1,641) | (1,648) | (1,743) | (2,043) | (2,255) | (3,580)
Indirect | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 981,741 |  | 873,139 |  |  |
Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 981,741 |  | 873,139 |  |  |
Direct |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 674,512 |  | 140,385 |  |  |
Allowance for credit losses | (14,412) | (14,450) | (528) | (640) | (665) | (855)
Direct | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 674,512 |  | 140,385 |  |  |
Direct | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 674,512 |  | 140,385 |  |  |
Home equity |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,097,852 |  | 560,590 |  |  |
Allowance for credit losses | (5,536) | $ (5,127) | (2,029) | $ (2,344) | $ (2,624) | $ (1,848)
Home equity | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,097,852 |  | 560,590 |  |  |
Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,097,852 |  | 560,590 |  |  |
Direct Finance Leases |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | $ 66,500 |  | $ 25,100 |  |  |

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