Investment Securities - Schedule of Investment Securities (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale securities
Amortized Cost	$ 3,979,814,000	$ 3,769,634,000
Gross unrealized gains	3,525,000	511,000
Gross unrealized losses	(480,424,000)	(527,128,000)
Fair Value	3,502,915,000	3,243,017,000
Held-to-maturity securities
Amortized Cost	3,857,263,000	3,641,055,000
Gross unrealized gains	3,472,000	477,000
Gross unrealized losses	(645,267,000)	(691,711,000)
Fair Value	3,215,468,000	2,949,821,000
Less: Allowance for credit losses	(347,000)	(488,000)
Held-to-maturity securities, net of allowance for credit losses	3,856,916,000	3,640,567,000
Equity securities with readily determinable fair value
Amortized Cost	143,312,000	115,552,000
Gross unrealized gains	3,500,000	2,935,000
Gross unrealized losses	(7,544,000)	(8,122,000)
Fair Value	139,268,000	110,365,000
U.S. Treasury
Available-for-sale securities
Amortized Cost	6,960,000	14,943,000
Gross unrealized gains	8,000	5,000
Gross unrealized losses	0	0
Fair Value	6,968,000	14,948,000
U.S. government agencies
Available-for-sale securities
Amortized Cost	50,000,000	80,000,000
Gross unrealized gains	0	36,000
Gross unrealized losses	(4,876,000)	(5,814,000)
Fair Value	45,124,000	74,222,000
Held-to-maturity securities
Amortized Cost	336,468,000	339,614,000
Gross unrealized gains	0	0
Gross unrealized losses	(67,058,000)	(75,293,000)
Fair Value	269,410,000	264,321,000
Municipal
Available-for-sale securities
Amortized Cost	144,299,000	173,861,000
Gross unrealized gains	657,000	230,000
Gross unrealized losses	(3,998,000)	(5,436,000)
Fair Value	140,958,000	168,655,000
Held-to-maturity securities
Amortized Cost	172,933,000	179,027,000
Gross unrealized gains	565,000	477,000
Gross unrealized losses	(3,778,000)	(4,066,000)
Fair Value	169,720,000	175,438,000
Corporate notes
Held-to-maturity securities
Amortized Cost	57,544,000	58,232,000
Gross unrealized gains	7,000	0
Gross unrealized losses	(3,480,000)	(5,348,000)
Fair Value	54,071,000	52,884,000
Financial issuers
Available-for-sale securities
Amortized Cost	83,996,000	93,994,000
Gross unrealized gains	0	0
Gross unrealized losses	(8,456,000)	(9,291,000)
Fair Value	75,540,000	84,703,000
Other
Available-for-sale securities
Amortized Cost	1,000,000	1,000,000
Gross unrealized gains	0	2,000
Gross unrealized losses	(9,000)	0
Fair Value	991,000	1,002,000
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	3,505,012,000	3,308,494,000
Gross unrealized gains	1,392,000	238,000
Gross unrealized losses	(446,784,000)	(488,795,000)
Fair Value	3,059,620,000	2,819,937,000
Held-to-maturity securities
Amortized Cost	3,042,828,000	2,900,031,000
Gross unrealized gains	1,922,000	0
Gross unrealized losses	(549,265,000)	(583,682,000)
Fair Value	2,495,485,000	2,316,349,000
Commercial (multi-family) mortgage-baked securities
Available-for-sale securities
Amortized Cost	13,201,000	0
Gross unrealized gains	68,000	0
Gross unrealized losses	(289,000)	0
Fair Value	12,980,000	0
Held-to-maturity securities
Amortized Cost	6,415,000	0
Gross unrealized gains	0	0
Gross unrealized losses	(184,000)	0
Fair Value	6,231,000	0
Collateralized mortgage obligations
Available-for-sale securities
Amortized Cost	175,346,000	97,342,000
Gross unrealized gains	1,400,000	0
Gross unrealized losses	(16,012,000)	(17,792,000)
Fair Value	160,734,000	79,550,000
Held-to-maturity securities
Amortized Cost	241,075,000	164,151,000
Gross unrealized gains	978,000	0
Gross unrealized losses	(21,502,000)	(23,322,000)
Fair Value	220,551,000	140,829,000
Mortgage-backed securities, subprime
Available-for-sale securities
Fair Value	$ 0	$ 0