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Investments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Cumulative net unamortized unrealized gain	$ 14,551,000		$ 14,551,000		$ 1,187,000
Maximum percentage of shareholders' equity security holdings held of one issuer	10.00%		10.00%		10.00%
Securities pledged	$ 1,600,000,000		$ 1,600,000,000		$ 1,500,000,000
Mortgage-backed securities, weighted average life			5 years
Allowance for credit losses on available-for-sale securities	0		$ 0		0
Accrued interest receivable, held-to-maturity securities	12,200,000		12,200,000		8,600,000
Allowance for credit losses on held-to-maturity securities	170,000		170,000		257,000
Other investments, at cost	94,127,000		94,127,000		72,784,000
Sale of debt securities, available-for-sale	0	$ 0	9,500,000	$ 100,000
Reclassified to Held to Maturity
Debt Securities, Available-for-sale [Line Items]
Cumulative net unamortized unrealized gain	8,400,000		8,400,000		10,800,000
Des Moines
Debt Securities, Available-for-sale [Line Items]
Other investments, at cost	$ 24,100,000		$ 24,100,000		$ 8,700,000

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