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Accounting Policies (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect of adoption | $ 360,171 | $ 353,033 |  | $ 334,392 | $ 325,660 | $ 317,687 | $ 301,728
Financing receivable, allowance for credit loss, excluding accrued interest | 26,956 | 27,010 |  | 29,232 | 28,446 | 26,300 |
Off-balance sheet, credit loss, liability | 1,800 |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect of adoption | $ 47,936 | $ 60,494 |  | 41,899 | $ 33,434 | $ 42,704 | $ 33,218
Accounting Standards Update 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  |  | $ (1,300) |  |  |  |
Off-balance sheet, credit loss, liability |  |  | 1,100 |  |  |  |
Deferred tax liabilities, net |  |  | 41 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect of adoption |  |  |  | 120 |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  |  |  | (1,300) |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect of adoption |  |  |  | $ 120 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Retained Earnings |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect of adoption |  |  | $ 120 |  |  |  |

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