Fair Value Measurements (Summarize Changes in Level 3 Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2025	Jun. 30, 2024	Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Impairments			$ 0
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	$ 28,892	$ 9,025	9,025
Assets, earnings	30		386
Assets, other comprehensive income	116		(333)
Assets, Impairments	0
Assets, purchases	1,160		0
Assets, (sales)	0		(223)
Assets, maturities	0		0
Assets. transfers out			20,037
Securities transferred into or out of level 3, net	0
Assets, ending balance	30,198		28,892
Level 3 | Debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	19,667	0	0
Assets, earnings	0	0
Assets, other comprehensive income	116	(333)
Assets, Impairments	0
Assets, Impairments		0
Assets, purchases	0	0
Assets, (sales)	0	0
Assets, maturities	0	0
Assets. transfers out		20,000
Securities transferred into or out of level 3, net	0
Assets, ending balance	19,783		19,667
Level 3 | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	5,715	5,253	5,253
Assets, earnings	(2)		647
Assets, other comprehensive income	0		0
Assets, Impairments	0		0
Assets, purchases	1,160		0
Assets, (sales)	0		(185)
Assets, maturities	0		0
Assets. transfers out	0		0
Assets, ending balance	6,873		5,715
Level 3 | Common stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	2,041	1,558	1,558
Assets, earnings	(2)		611
Assets, other comprehensive income	0		0
Assets, Impairments	0		0
Assets, purchases	0		0
Assets, (sales)	0		(128)
Assets, maturities	0		0
Assets. transfers out	0		0
Assets, ending balance	2,039		2,041
Level 3 | Preferred stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	3,674	3,695	3,695
Assets, earnings	0		36
Assets, other comprehensive income	0		0
Assets, Impairments	0		0
Assets, purchases	1,160		0
Assets, (sales)	0		(57)
Assets, maturities	0		0
Assets. transfers out	0		0
Assets, ending balance	4,834		3,674
Level 3 | Arbitrage trading account
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	3,510	3,772	3,772
Assets, earnings	32		(261)
Assets, other comprehensive income	0		0
Assets, Impairments	0
Assets, Impairments			0
Assets, purchases	0		0
Assets, (sales)	0		(38)
Assets, maturities	0		0
Assets. transfers out			37
Securities transferred into or out of level 3, net
Assets, ending balance	3,542		3,510
Level 3 | Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	19,667	0	0
Assets, earnings	0	0
Assets, other comprehensive income	116	(333)
Assets, Impairments	0	0
Assets, purchases	0	0
Assets, (sales)	0	0
Assets, maturities	0	0
Securities transferred into or out of level 3, net	0	$ 20,000
Assets, ending balance	$ 19,783		$ 19,667