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Loans Receivable and Other Lending Investments, net (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jan. 01, 2020
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period |  |  | $ 13,170 |  |  |
(Recovery of) provision for loan losses | $ (1,556) | $ (1,976) | (7,613) | $ 4,093 |  |
Allowance for loan losses at end of period | 6,370 |  | 6,370 |  |  |
Held to Maturity Debt Securities |  |  |  |  |  |
Allowance for loan losses at beginning of period | 2,393 | 111 | 3,093 |  |  |
(Recovery of) Provision for loan losses | 145 | (56) | (555) | 35 |  |
Allowance for loan losses at end of period | 2,538 | 55 | 2,538 | 55 |  |
Total |  |  |  |  |  |
Allowance for loan losses at beginning of period | 7,135 | 35,612 | 13,170 | 28,634 |  |
(Recovery of) Provision for loan losses | (765) | (2,165) | (6,800) | 4,084 |  |
Allowance for loan losses at end of period | 6,370 | 33,447 | 6,370 | 33,447 |  |
Increase to reserves for loan losses | 100 |  | 100 |  | $ 1,000 |
Provision for (recovery of) loan losses | (1,600) | (2,000) | (7,600) | 4,100 |  |
Accrued Interest And Operating Lease Income Receivable, Net |  |  |  |  |  |
Total |  |  |  |  |  |
Provision for (recovery of) loan losses |  | 900 |  | 900 |  |
Accounts Payable, Accrued Expenses and Other Liabilities |  |  |  |  |  |
Total |  |  |  |  |  |
Provision for ( recovery of) unfunded commitments | (900) | (700) | (900) | (900) |  |
Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |
Held to Maturity Debt Securities |  |  |  |  |  |
Allowance for loan losses at beginning of period |  |  |  | 20 |  |
Total |  |  |  |  |  |
Allowance for loan losses at beginning of period |  |  |  | 729 |  |
Increase to reserves for loan losses |  |  |  |  |  | $ 3,300
Period of Adoption, Adjustment | ASU 2016-13 | Accounts Payable, Accrued Expenses and Other Liabilities |  |  |  |  |  |
Total |  |  |  |  |  |
Increase to reserves for loan losses |  |  |  |  |  | $ 2,500
Construction Loans |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period | 1,640 | 11,736 | 6,541 | 6,668 |  |
(Recovery of) provision for loan losses | (149) | (2,598) | (5,050) | 2,823 |  |
Allowance for loan losses at end of period | 1,491 | 9,138 | 1,491 | 9,138 |  |
Construction Loans | Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period |  |  |  | (353) |  |
Loans |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period | 1,619 | 905 | 1,643 | 265 |  |
(Recovery of) provision for loan losses | (865) | (427) | (889) | 115 |  |
Allowance for loan losses at end of period | 754 | 478 | 754 | 478 |  |
Loans | Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period |  |  |  | 98 |  |
Financing receivables |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period | 893 | 1,159 | 1,150 |  |  |
(Recovery of) provision for loan losses | 54 | 17 | (203) | 212 |  |
Allowance for loan losses at end of period | 947 | 1,176 | 947 | 1,176 |  |
Financing receivables | Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period |  |  |  | 964 |  |
Specific receivables |  |  |  |  |  |
Financing Receivables |  |  |  |  |  |
Allowance for loan losses at beginning of period | 590 | 21,701 | 743 | 21,701 |  |
(Recovery of) provision for loan losses | 50 | 899 | (103) | 899 |  |
Allowance for loan losses at end of period | $ 640 | $ 22,600 | $ 640 | $ 22,600 |  |

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