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Allowance For Credit Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,331,821			$ 1,243,848
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	91,758	$ 89,785		87,966	$ 87,237	$ 86,575		$ 83,745
Allowance for credit loss, qualitative adjustment	2,200			1,200
Loan balance	7,992,753			7,817,128
special purpose mortgage loan program
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance	225,000
special purpose mortgage loan program
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss, qualitative adjustment	1,100
Catastrophe
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss, qualitative adjustment	760			757
Retained Earnings [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,062,557	$ 1,032,793	$ 1,002,110	$ 977,599	$ 964,008	$ 943,149	$ 921,101	$ 903,877

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