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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Contractual Maturities and Estimated Fair Values (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Amortized Cost
Due in one year or less, held-to-maturity debt securities amortized cost	$ 3,075,000		$ 3,075,000
Due after one year through five years, held-to-maturity debt securities amortized cost	1,325,000		1,325,000
Amortized cost, held-to-maturity debt securities	4,400,000		4,400,000		$ 4,400,000
Fair Value
Due in one year or less, held-to-maturity debt securities, Estimated fair value	3,075,000		3,075,000
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,325,000		1,325,000
Estimated fair value	4,400,000		4,400,000		4,400,000
Available-for-sale debt securities amortized cost disclosures
Due after five years through ten years, available-for-sale debt securities amortized cost	2,240,000		2,240,000
Due after ten years, available-for-sale debt securities amortized cost	138,881,000		138,881,000
Residential mortgage-backed securities, available-for-sale debt securities amortized cost	5,175,459,000		5,175,459,000
Amortized cost, Available-for-sale securities	5,316,580,000		5,316,580,000		5,472,310,000
Available for sale debt securities, Estimated Fair Value Disclosures
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value	2,240,000		2,240,000
Due after ten years, available-for-sale debt securities, Estimated Fair Value	132,578,000		132,578,000
Residential mortgage-backed securities, available-for-sale debt securities, Estimated Fair Value	4,845,524,000		4,845,524,000
Estimated fair value, Available for sale securities	4,980,342,000		4,980,342,000		$ 4,987,916,000
Available for sale debt securities, Estimated Fair Value Disclosures
Proceeds from sales and calls of available for sale securities	11,255,000	$ 2,030,000	15,490,000	$ 3,750,000
Proceeds from sales of mortgage-backed securities	0	0	0	0
Allowance for credit losses	0		0
Gross gains realized on sales	0	0	0	0
Gross losses realized on sales	1	$ 1	1	$ 1
Collateral pledged
Available-for-sale debt securities amortized cost disclosures
Amortized cost, Available-for-sale securities	1,729,904,000		1,729,904,000
Available for sale debt securities, Estimated Fair Value Disclosures
Fair value of available for sale investment securities pledged	$ 1,557,621,000		$ 1,557,621,000

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