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Investments - Narrative (Details) - USD ($)	1 Months Ended		3 Months Ended
	Mar. 31, 2023	Jan. 31, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,716,681,000		$ 1,716,681,000		$ 1,729,054,000
Cumulative net unamortized unrealized gain	$ 727,000		$ 727,000		$ 481,000
Maximum percentage of shareholders' equity security holdings held of one issuer	10.00%		10.00%		10.00%
Securities pledged	$ 1,800,000,000		$ 1,800,000,000		$ 734,500,000
Mortgage-backed securities, weighted average life			6 years
Provision for credit losses on available-for-sale securities	4,800,000
Charge-off	4,800,000
Allowance for credit losses on available-for-sale securities	0		$ 0		0
Accrued interest receivable, held-to-maturity securities	6,600,000		6,600,000		5,800,000
Allowance for credit losses on held-to-maturity debt securities	(872,000)		(872,000)		(735,000)
Sale of debt securities, available-for-sale		$ 28,400,000	28,741,000	$ 0
Debt Securities, Available-for-sale, Realized Gain		$ 400,000
Other investments, at cost	62,943,000		62,943,000		63,790,000
Reclassified to Held to Maturity
Debt Securities, Available-for-sale [Line Items]
Cumulative net unamortized unrealized gain	16,800,000		16,800,000		17,600,000
Des Moines
Debt Securities, Available-for-sale [Line Items]
Other investments, at cost	$ 14,000,000		$ 14,000,000		$ 14,000,000

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