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Loans and Leases - Schedule of loan and lease balances for the originated and acquired portfolios (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 18,241,907 | $ 9,779,288
Weighted Average Coupon | 5.95% | 5.91%
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 7,322,006 | $ 4,027,265
Multi-family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | 2,130,337 | 1,387,796
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | 759,729 | 301,053
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | 2,729,664 | 1,211,714
Equipment financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | 1,204,048 | 1,294,950
Residential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | 3,278,048 | 1,114,732
Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | 650,746 | 377,411
Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | 167,329 | 64,367
Commercial real estate loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 10,212,072 | $ 5,716,114
Weighted Average Coupon | 5.77% | 5.40%
Commercial real estate loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 7,322,006 | $ 4,027,265
Weighted Average Coupon | 5.74% | 5.40%
Commercial real estate loans | Multi-family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 2,130,337 | $ 1,387,796
Weighted Average Coupon | 5.42% | 5.06%
Commercial real estate loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 759,729 | $ 301,053
Weighted Average Coupon | 7.08% | 7.00%
Commercial loans and leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 3,933,712 | $ 2,506,664
Weighted Average Coupon | 7.22% | 7.40%
Commercial loans and leases | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 2,729,664 | $ 1,211,714
Weighted Average Coupon | 6.66% | 6.47%
Commercial loans and leases | Equipment financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 1,204,048 | $ 1,294,950
Weighted Average Coupon | 8.50% | 8.27%
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 4,096,123 | $ 1,556,510
Weighted Average Coupon | 5.17% | 5.38%
Consumer loans | Residential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 3,278,048 | $ 1,114,732
Weighted Average Coupon | 4.81% | 4.69%
Consumer loans | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 650,746 | $ 377,411
Weighted Average Coupon | 6.91% | 7.18%
Consumer loans | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance | $ 167,329 | $ 64,367
Weighted Average Coupon | 5.52% | 6.67%

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