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Allowance For Credit Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Loans collectively evaluated for impairment | $ 7,675,220 |  |  | $ 7,428,171 |  |  |  |
Loan balance | 7,730,984 |  |  | 7,476,221 |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,239,413 |  |  | 1,145,293 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 87,237 | $ 86,575 |  | 83,745 | $ 84,602 | $ 87,206 |  | $ 85,379
Allowance for credit loss, qualitative adjustment | 2,100 |  |  | 417 |  |  |  |
Catastrophe |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance for credit loss, qualitative adjustment | 1,700 |  |  |  |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 964,008 | $ 943,149 | $ 921,101 | $ 903,877 | $ 896,627 | $ 876,830 | $ 862,518 | 847,235
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest |  |  |  |  |  |  |  | 383
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  | (303)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02 [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest |  |  |  |  |  |  |  | 383
Deferred Tax Assets, Tax Deferred Expense |  |  |  |  |  |  |  | 80
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  | $ 303

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