Fair Value - Fair Value Measurements on a Recurring and Nonrecurring Basis by Asset Class and Level of Input (Details) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2026	Dec. 31, 2025
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	$ 1,411,389,000
Fair value of securities lent	56,400,000	$ 64,500,000
Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total recurring fair value measurements	1,561,990,000	1,443,707,000
Total available-for-sale securities
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	1,411,389,000	1,364,828,000
Fair value of securities lent	42,300,000	44,400,000
Total available-for-sale securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	1,411,389,000	1,364,828,000
Corporate debt securities
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	761,885,000	844,479,000
Corporate debt securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	761,885,000	844,479,000
Collateralized debt obligations
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	243,276,000	133,267,000
Collateralized debt obligations \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	243,276,000	133,267,000
Commercial mortgage-backed securities
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	156,230,000	140,541,000
Commercial mortgage-backed securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	156,230,000	140,541,000
Residential mortgage-backed securities
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	208,027,000	187,226,000
Residential mortgage-backed securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	208,027,000	187,226,000
Other debt securities
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	41,131,000	35,152,000
Other debt securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	41,131,000	35,152,000
U.S. Treasury
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	840,000	24,163,000
U.S. Treasury \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	840,000	24,163,000
Equity securities
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Equity securities without readily determinable fair value	16,200,000	11,900,000
Fair value of securities lent	14,100,000	20,100,000
Equity securities \| Portion at Other than Fair Value Measurement
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Equity securities without readily determinable fair value	11,700,000	8,700,000
Equity securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	150,601,000	78,879,000
Equity securities \| Nonrecurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Equity securities without readily determinable fair value	4,521,000	3,161,000
Equity securities without readily determinable fair value, upward adjustments resulting from observable price changes	900,000	700,000
Equity securities without readily determinable fair value, cumulative upward adjustments resulting from observable price changes	2,000,000.0	1,100,000
Equity securities without readily determinable fair value, impairment loss resulting from observable price changes	0	0
Equity securities without readily determinable fair value, downward adjustments resulting from observable price changes	0	0
Equity securities \| Exchange-traded funds \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	79,803,000
Equity securities \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	70,798,000	78,879,000
Equity securities \| Financial services sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	62,370,000	69,114,000
Equity securities \| Utilities sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	545,000	3,696,000
Equity securities \| Energy sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	3,530,000	2,713,000
Equity securities \| Consumer sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	2,887,000	2,403,000
Equity securities \| Technology sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	26,000	0
Equity securities \| Communications sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	1,440,000	953,000
Level 1 \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total recurring fair value measurements	81,588,000	3,591,000
Level 1 \| Total available-for-sale securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	1,275,000	998,000
Level 1 \| Corporate debt securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	1,275,000	998,000
Level 1 \| Collateralized debt obligations \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	0	0
Level 1 \| Commercial mortgage-backed securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	0	0
Level 1 \| Residential mortgage-backed securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	0	0
Level 1 \| Other debt securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	0	0
Level 1 \| U.S. Treasury \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	0	0
Level 1 \| Equity securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	80,313,000	2,593,000
Level 1 \| Equity securities \| Nonrecurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Equity securities without readily determinable fair value	0	0
Level 1 \| Equity securities \| Exchange-traded funds \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	79,803,000
Level 1 \| Equity securities \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	510,000	2,593,000
Level 1 \| Equity securities \| Financial services sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	510,000	2,593,000
Level 1 \| Equity securities \| Utilities sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	0	0
Level 1 \| Equity securities \| Energy sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	0	0
Level 1 \| Equity securities \| Consumer sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	0	0
Level 1 \| Equity securities \| Technology sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	0	0
Level 1 \| Equity securities \| Communications sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	0	0
Level 2 \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total recurring fair value measurements	1,453,558,000	1,412,181,000
Level 2 \| Total available-for-sale securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	1,383,319,000	1,336,076,000
Level 2 \| Corporate debt securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	760,256,000	839,542,000
Level 2 \| Collateralized debt obligations \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	243,276,000	133,267,000
Level 2 \| Commercial mortgage-backed securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	132,348,000	117,520,000
Level 2 \| Residential mortgage-backed securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	205,468,000	186,432,000
Level 2 \| Other debt securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	41,131,000	35,152,000
Level 2 \| U.S. Treasury \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	840,000	24,163,000
Level 2 \| Equity securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	70,239,000	76,105,000
Level 2 \| Equity securities \| Nonrecurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Equity securities without readily determinable fair value	0	0
Level 2 \| Equity securities \| Exchange-traded funds \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	0
Level 2 \| Equity securities \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	70,239,000	76,105,000
Level 2 \| Equity securities \| Financial services sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	61,843,000	66,350,000
Level 2 \| Equity securities \| Utilities sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	545,000	3,696,000
Level 2 \| Equity securities \| Energy sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	3,530,000	2,713,000
Level 2 \| Equity securities \| Consumer sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	2,881,000	2,393,000
Level 2 \| Equity securities \| Technology sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	0	0
Level 2 \| Equity securities \| Communications sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	1,440,000	953,000
Level 3 \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total recurring fair value measurements	26,844,000	27,935,000
Level 3 \| Total available-for-sale securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	26,795,000	27,754,000
Level 3 \| Corporate debt securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	354,000	3,939,000
Level 3 \| Collateralized debt obligations \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	0	0
Level 3 \| Commercial mortgage-backed securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	23,882,000	23,021,000
Level 3 \| Residential mortgage-backed securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	2,559,000	794,000
Level 3 \| Other debt securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	0	0
Level 3 \| U.S. Treasury \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total available-for-sale securities	0	0
Level 3 \| Equity securities \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	49,000	181,000
Level 3 \| Equity securities \| Nonrecurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Equity securities without readily determinable fair value	4,521,000	3,161,000
Level 3 \| Equity securities \| Exchange-traded funds \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	0
Level 3 \| Equity securities \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	49,000	181,000
Level 3 \| Equity securities \| Financial services sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	17,000	171,000
Level 3 \| Equity securities \| Utilities sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	0	0
Level 3 \| Equity securities \| Energy sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	0	0
Level 3 \| Equity securities \| Consumer sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	6,000	10,000
Level 3 \| Equity securities \| Technology sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	26,000	0
Level 3 \| Equity securities \| Communications sector \| Non-redeemable preferred stocks \| Recurring fair value measurements
Fair value measurements on a recurring and nonrecurring basis by asset class and level of input
Total equity securities	$ 0	$ 0

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details

Name:	us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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