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Loans (Narrative) (Details) | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2025 USD ($) | Dec. 31, 2024 USD ($) loan item | Sep. 30, 2024 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2024 USD ($) item loan | Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) | Mar. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans held for sale |  | $ 223,100,000 |  |  | $ 223,100,000 | $ 332,800,000 |  |
Loans available for sale, unpaid principal amount |  | 223,500,000 |  |  | 223,500,000 | 336,500,000 |  |
Gains (losses) recognized from changes in fair value |  |  |  |  | (683,000) | (3,100,000) | $ (6,100,000) |
Total loans, gross |  | 6,100,291,000 |  |  | 6,100,291,000 | 5,352,339,000 |  |
Unrealized loss to reflect write-down |  |  |  | $ 4,000,000.0 |  |  |  |
Changes in fair value related to instrument-specific credit risk |  |  |  |  | 867,000 | 1,700,000 | 7,700,000 |
Amounts drawn against these lines |  | $ 0 |  |  | $ 0 |  |  |
Loan, disposition costs |  |  |  | $ 9,500,000 |  |  |  |
Number of securities securitized | item |  | 6 |  |  | 6 |  |  |
Interest which would have been earned on loans classified as non-accrual |  |  |  |  | $ 1,100,000 | 738,000 |  |
Other real estate owned |  | $ 62,025,000 |  |  | 62,025,000 | 16,949,000 | 21,210,000 | $ 41,100,000
Charge-offs |  |  |  |  | 28,938,000 | 8,465,000 | 5,741,000 |
Non-accrual loans, income |  |  |  |  | 0 | 0 |  |
Nonaccrual loans, Income Reversed |  | 1,300,000 |  |  |  |  |  |
Financing receivables excluding accrued interest |  | $ 6,100,291,000 |  |  | $ 6,100,291,000 | $ 5,352,339,000 |  |
Commitments to lend additional funds to loan customers whose terms have been modified in troubled debt restructurings, number of loans | loan |  | 0 |  |  | 0 | 0 |  |
Troubled debt restructured loans balance |  |  |  |  | $ 75,700,000 | $ 13,100,000 |  |
Financing receivable, troubled debt restructured loans, reserves |  |  |  |  | 768,000 | 127,000 |  |
Purchase of lease receivables |  |  |  |  | 46,700,000 |  |  |
Remaining balance of PPP loan reimbursed |  | $ 1,500,000 |  |  | 1,500,000 |  |  |
Total non-accrual loans |  | 27,934,000 |  |  | 27,934,000 | 11,525,000 |  |
Allowance for credit losses on off-balance sheet credit |  | 2,000,000.0 |  |  | 2,000,000.0 |  |  |
Federal Reserve Bank Advances [Member] | Asset Pledged as Collateral without Right [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 2,460,000,000 |  |  | 2,460,000,000 |  |  |
Federal Home Loan Bank Advances [Member] | Asset Pledged as Collateral without Right [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 2,220,000,000 |  |  | 2,220,000,000 |  |  |
Term Extension [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 2,477,000 |  |  | 2,477,000 |  |  |
Loans receiving term extension modification |  |  |  |  | $ 0 |  |  |
Troubled debt restructured loans balance |  |  |  |  |  | 12,427,000 |  |
Equities [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Market value of the underlying securities collateral as adjusted by margin requirements, percent |  |  |  |  | 50 |  |  |
Investment Grade Securities [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Market value of the underlying securities collateral as adjusted by margin requirements, percent |  |  |  |  | 80 |  |  |
Equity Securities [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, advanced rate calculation, percentage |  |  |  |  | 50.00% |  |  |
Debt Securities [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, advanced rate calculation, percentage |  |  |  |  | 80.00% |  |  |
CRE2 [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total non-accrual loans |  | 3,500,000 |  |  | $ 3,500,000 |  |  |
CRE2 [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 12,600,000 |  |  | 12,600,000 |  |  |
CRE2 [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 3,500,000 |  |  | 3,500,000 |  |  |
SBL Commercial Mortgage [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 662,091,000 |  |  | 662,091,000 | 606,986,000 |  |
Charge-offs |  |  |  |  | 383,000 | 236,000 | (367,000) |
Nonaccrual loans, Income Reversed |  |  |  |  | 130,000 |  |  |
Financing receivables excluding accrued interest |  | 657,711,000 |  |  | 657,711,000 | 602,274,000 |  |
Total non-accrual loans |  | 4,885,000 |  |  | 4,885,000 | 2,381,000 |  |
SBL Loan - PPP, Including Other Institutions [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 19,700,000 |  |  | 19,700,000 |  |  |
SBLOC [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivables excluding accrued interest |  | 1,015,884,000 |  |  | 1,015,884,000 | 980,419,000 |  |
Advisor Financing [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 273,896,000 |  |  | 273,896,000 | 221,612,000 |  |
Charge-offs |  |  |  |  | 392,000 | 369,000 | 425,000 |
Financing receivables excluding accrued interest |  | 273,896,000 |  |  | $ 273,896,000 | 221,612,000 |  |
Loan amount, loan-to-value ratio |  |  |  |  | 70.00% |  |  |
SBA Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans, Income Reversed |  |  |  |  |  | 89,000 |  |
SBL Non-Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 190,322,000 |  |  | $ 190,322,000 | 137,752,000 |  |
Charge-offs |  |  |  |  | (608,000) | 1,427,000 | 358,000 |
Nonaccrual loans, Income Reversed |  |  |  |  | 38,000 | 44,000 |  |
Financing receivables excluding accrued interest |  | 186,060,000 |  |  | 186,060,000 | 131,135,000 |  |
Total non-accrual loans |  | 2,635,000 |  |  | 2,635,000 | 1,842,000 |  |
Direct Lease Financing [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 700,553,000 |  |  | 700,553,000 | 685,657,000 |  |
Charge-offs |  |  |  |  | 6,928,000 | 5,818,000 | 2,607,000 |
Nonaccrual loans, Income Reversed |  |  |  |  | 161,000 | 110,000 |  |
Financing receivables excluding accrued interest |  | 700,553,000 |  |  | 700,553,000 | 685,657,000 |  |
Total non-accrual loans |  | 6,026,000 |  |  | 6,026,000 | 3,785,000 |  |
Direct Lease Financing [Member] | Term Extension [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 2,477,000 |  |  | 2,477,000 |  |  |
Troubled debt restructured loans balance |  |  |  |  |  | 127,000 |  |
Legacy Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans, Income Reversed |  |  |  |  |  | 89,000 |  |
IBLOC [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 548,100,000 |  |  | 548,100,000 | 646,900,000 |  |
Nonaccrual loans, Income Reversed |  |  |  |  | 14,000 | 13,000 |  |
Financing receivables excluding accrued interest |  | 548,134,000 |  |  | 548,134,000 | 646,866,000 |  |
Total non-accrual loans |  | 503,000 |  |  | 503,000 |  |  |
Real Estate Bridge Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 2,109,041,000 |  |  | $ 2,109,041,000 | 1,999,782,000 |  |
Debt Instrument, Term |  |  |  |  | 3 years |  |  |
Number of loan extensions | item |  |  |  |  | 2 |  |  |
Loan Term, Extension Period |  |  |  |  | 1 year |  |  |
Charge-offs |  |  |  |  | $ 1,863,000 | 1,619,000 | $ 1,940,000 |
Nonaccrual loans, Income Reversed |  |  | $ 815,000 |  | 1,000,000.0 |  |  |
Financing receivables excluding accrued interest |  | 2,109,041,000 |  |  | 2,109,041,000 | 1,999,782,000 |  |
Troubled debt restructured loans balance |  |  |  |  | 12,300,000 | 12,300,000 |  |
Total non-accrual loans |  | 12,300,000 |  |  | 12,300,000 | 12,300,000 |  | $ 39,400,000
Proceeds from Sale of Loans Held-for-sale, Total |  |  |  |  | $ 82,000,000 |  |  |
Loan amount, weighted average loan-to-value ratio |  |  |  |  | 73 |  |  |
Loan amount, loan-to-value ratio |  |  |  |  | 63.00% |  |  |
Real Estate Bridge Loans [Member] | Term Extension [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Troubled debt restructured loans balance |  |  |  |  |  | 12,300,000 |  |
Consumer Fintech [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 454,357,000 |  |  | $ 454,357,000 |  |  |
Charge-offs |  |  |  |  | 19,619,000 |  |  |
Non-accrual loans, income |  |  |  |  | 19,600,000 |  |  |
Consumer Fintech [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Charge-offs | $ 0 |  |  |  |  |  |  |
Total non-accrual loans | $ 28,600,000 |  |  |  |  |  |  |
Secured Consumer Credit Card Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 201,100,000 |  |  | 201,100,000 |  |  |
Commercial Loan [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 2,210,000,000 |  |  | 2,210,000,000 |  |  |
Commercial Loan [Member] | Apartment Building Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total loans, gross |  | 2,170,000,000 |  |  | 2,170,000,000 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  | $ 0 |  |  | $ 0 | $ 0 |  |

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