Investment Securities - Schedule of Investment Securities (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Available-for-sale securities
Amortized Cost	$ 4,725,539,000	$ 3,979,814,000
Gross unrealized gains	2,071,000	3,525,000
Gross unrealized losses	(586,128,000)	(480,424,000)
Fair Value	4,141,482,000	3,502,915,000
Held-to-maturity securities
Amortized Cost	3,613,720,000	3,857,263,000
Gross unrealized gains	1,066,000	3,472,000
Gross unrealized losses	(704,236,000)	(645,267,000)
Fair Value	2,910,550,000	3,215,468,000
Less: Allowance for credit losses	(457,000)	(347,000)
Held-to-maturity securities, net of allowance for credit losses	3,613,263,000	3,856,916,000
Equity securities with readily determinable fair value
Amortized Cost	220,758,000	143,312,000
Gross unrealized gains	2,905,000	3,500,000
Gross unrealized losses	(8,251,000)	(7,544,000)
Fair Value	215,412,000	139,268,000
U.S. Treasury
Available-for-sale securities
Amortized Cost	37,858,000	6,960,000
Gross unrealized gains	49,000	8,000
Gross unrealized losses	0	0
Fair Value	37,907,000	6,968,000
U.S. government agencies
Available-for-sale securities
Amortized Cost	50,000,000	50,000,000
Gross unrealized gains	0	0
Gross unrealized losses	(5,055,000)	(4,876,000)
Fair Value	44,945,000	45,124,000
Held-to-maturity securities
Amortized Cost	313,539,000	336,468,000
Gross unrealized gains	0	0
Gross unrealized losses	(69,127,000)	(67,058,000)
Fair Value	244,412,000	269,410,000
Municipal
Available-for-sale securities
Amortized Cost	188,405,000	144,299,000
Gross unrealized gains	528,000	657,000
Gross unrealized losses	(4,340,000)	(3,998,000)
Fair Value	184,593,000	140,958,000
Held-to-maturity securities
Amortized Cost	161,016,000	172,933,000
Gross unrealized gains	243,000	565,000
Gross unrealized losses	(5,290,000)	(3,778,000)
Fair Value	155,969,000	169,720,000
Corporate notes
Held-to-maturity securities
Amortized Cost	56,851,000	57,544,000
Gross unrealized gains	8,000	7,000
Gross unrealized losses	(1,870,000)	(3,480,000)
Fair Value	54,989,000	54,071,000
Financial issuers
Available-for-sale securities
Amortized Cost	83,997,000	83,996,000
Gross unrealized gains	0	0
Gross unrealized losses	(3,828,000)	(8,456,000)
Fair Value	80,169,000	75,540,000
Other
Available-for-sale securities
Amortized Cost	1,000,000	1,000,000
Gross unrealized gains	0	0
Gross unrealized losses	(7,000)	(9,000)
Fair Value	993,000	991,000
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	4,106,641,000	3,505,012,000
Gross unrealized gains	284,000	1,392,000
Gross unrealized losses	(553,287,000)	(446,784,000)
Fair Value	3,553,638,000	3,059,620,000
Held-to-maturity securities
Amortized Cost	2,864,927,000	3,042,828,000
Gross unrealized gains	0	1,922,000
Gross unrealized losses	(605,014,000)	(549,265,000)
Fair Value	2,259,913,000	2,495,485,000
Commercial (multi-family) mortgage-baked securities
Available-for-sale securities
Amortized Cost	19,064,000	13,201,000
Gross unrealized gains	23,000	68,000
Gross unrealized losses	(755,000)	(289,000)
Fair Value	18,332,000	12,980,000
Held-to-maturity securities
Amortized Cost	6,364,000	6,415,000
Gross unrealized gains	0	0
Gross unrealized losses	(252,000)	(184,000)
Fair Value	6,112,000	6,231,000
Collateralized mortgage obligations
Available-for-sale securities
Amortized Cost	238,574,000	175,346,000
Gross unrealized gains	1,187,000	1,400,000
Gross unrealized losses	(18,856,000)	(16,012,000)
Fair Value	220,905,000	160,734,000
Held-to-maturity securities
Amortized Cost	211,023,000	241,075,000
Gross unrealized gains	815,000	978,000
Gross unrealized losses	(22,683,000)	(21,502,000)
Fair Value	189,155,000	220,551,000
Mortgage-backed securities, subprime
Available-for-sale securities
Fair Value	$ 0	$ 0