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Loans Receivable and Other Lending Investments, net (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Jan. 01, 2020
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period | $ 28,634 | $ 28,634 |  |  |  |
Adoption of new accounting standard | 28,634 | 28,634 | $ 28,634 |  | $ 13,170 |
Provision for loan losses |  | 9,052 | 6,482 | $ 16,937 |  |
Allowance for loan losses at end of period |  | 13,170 | 28,634 |  |  |
Held to Maturity Debt Securities |  |  |  |  |  |
Allowance for loan losses at beginning of period | 0 | 0 |  |  |  |
Adoption of new accounting standard | 0 | 3,093 | 0 |  | 3,093 |
Provision for loan losses |  | 3,073 |  |  |  |
Charge offs |  | 0 |  |  |  |
Allowance for loan losses at end of period |  | 3,093 | 0 |  |  |
Total |  |  |  |  |  |
Allowance for loan losses at beginning of period | 28,634 | 28,634 |  |  |  |
Allowance For Credit Loss | 28,634 | 13,170 | 28,634 |  | 13,170 |
Provision for loan losses |  | 9,696 |  |  |  |
Charge offs |  | (25,889) |  |  |  |
Allowance for loan losses at end of period |  | 13,170 | 28,634 |  |  |
Increase to reserves for loan losses |  |  |  |  | 1,000 |
Provision |  | 9,100 |  |  |  |
Nonperforming Financial Instruments |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Charge offs |  |  | (19,200) |  |  |
Total |  |  |  |  |  |
Charge offs |  |  | 19,200 |  |  |
Nonperforming Financial Instrument With Deteriorated Collateral |  |  |  |  |  |
Total |  |  |  |  |  |
Financing receivable, allowance for credit loss, writeoff, deterioration of collateral |  |  | 12,000 |  |  |
Accounts Payable, Accrued Expenses, and Other Liabilities |  |  |  |  |  |
Total |  |  |  |  |  |
Increase to reserves for loan losses |  |  |  |  |  | $ 2,500
Recoveries for unfunded commitments |  | 1,500 |  |  |  |
Accrued Interest And Operating Lease Income Receivable, Net |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Provision for loan losses |  | 900 |  |  |  |
ASU 2016-13 |  |  |  |  |  |
Total |  |  |  |  |  |
Increase to reserves for loan losses |  |  |  |  |  | 3,300
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Provision for loan losses | 3,300 |  |  |  |  |
Held to Maturity Debt Securities |  |  |  |  |  |
Adoption of new accounting standard | 20 |  |  |  |  | 20
Allowance for loan losses at end of period | 20 |  |  |  |  |
Total |  |  |  |  |  |
Allowance For Credit Loss | 729 |  |  |  |  | 729
Allowance for loan losses at end of period | 729 |  |  |  |  |
Construction Loans |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period | 6,668 | 6,668 |  |  |  |
Adoption of new accounting standard | 6,668 | 6,541 | 6,668 |  | 6,541 |
Provision for loan losses |  | 226 |  |  |  |
Charge offs |  | 0 |  |  |  |
Allowance for loan losses at end of period |  | 6,541 | 6,668 |  |  |
Total |  |  |  |  |  |
Charge offs |  | 0 |  |  |  |
Construction Loans | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Adoption of new accounting standard | (353) |  |  |  |  | (353)
Allowance for loan losses at end of period | (353) |  |  |  |  |
Loans |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period | 265 | 265 |  |  |  |
Adoption of new accounting standard | 265 | 1,643 | 265 |  | 1,643 |
Provision for loan losses |  | 1,280 |  |  |  |
Charge offs |  | 0 |  |  |  |
Allowance for loan losses at end of period |  | 1,643 | 265 |  |  |
Total |  |  |  |  |  |
Charge offs |  | 0 |  |  |  |
Loans | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Adoption of new accounting standard | 98 |  |  |  |  | 98
Allowance for loan losses at end of period | 98 |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period | 0 | 0 |  |  |  |
Adoption of new accounting standard | 0 | 1,150 | 0 |  | 1,150 |
Provision for loan losses |  | 186 |  |  |  |
Charge offs |  | 0 |  |  |  |
Allowance for loan losses at end of period |  | 1,150 | 0 |  |  |
Total |  |  |  |  |  |
Charge offs |  | 0 |  |  |  |
Financing Receivables | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Adoption of new accounting standard | 964 |  |  |  |  | 964
Allowance for loan losses at end of period | 964 |  |  |  |  |
Specific Allowance |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period | 21,701 | 21,701 |  |  |  |
Adoption of new accounting standard | 21,701 | 743 | 21,701 |  | $ 743 |
Provision for loan losses |  | 4,931 |  |  |  |
Charge offs |  | (25,889) |  |  |  |
Allowance for loan losses at end of period |  | 743 | $ 21,701 |  |  |
Total |  |  |  |  |  |
Charge offs |  | $ 25,889 |  |  |  |
Specific Allowance | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Adoption of new accounting standard | 0 |  |  |  |  | $ 0
Allowance for loan losses at end of period | $ 0 |  |  |  |  |

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