Investment Securities - Schedule of Available-for-sale Investment Securities Portfolios (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	$ 2,460,239,000	$ 381,342,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(550,821,000)	(1,981,000)
Continuous unrealized losses existing for greater than 12 months, fair value	1,430,683,000	2,628,705,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(35,307,000)	(478,443,000)
Total, fair value	3,890,922,000	3,010,047,000
Total, unrealized losses	(586,128,000)	(480,424,000)
Available-for-sale securities	4,141,482,000	3,502,915,000
U.S. government agencies
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	44,945,000	0
Continuous unrealized losses existing for less than 12 months, unrealized losses	(5,055,000)	0
Continuous unrealized losses existing for greater than 12 months, fair value	0	45,124,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	0	(4,876,000)
Total, fair value	44,945,000	45,124,000
Total, unrealized losses	(5,055,000)	(4,876,000)
Available-for-sale securities	44,945,000	45,124,000
Municipal
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	52,344,000	36,519,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(3,536,000)	(513,000)
Continuous unrealized losses existing for greater than 12 months, fair value	83,517,000	58,216,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(804,000)	(3,485,000)
Total, fair value	135,861,000	94,735,000
Total, unrealized losses	(4,340,000)	(3,998,000)
Available-for-sale securities	184,593,000	140,958,000
Financial issuers
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	80,169,000	0
Continuous unrealized losses existing for less than 12 months, unrealized losses	(3,828,000)	0
Continuous unrealized losses existing for greater than 12 months, fair value	0	75,540,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	0	(8,456,000)
Total, fair value	80,169,000	75,540,000
Total, unrealized losses	(3,828,000)	(8,456,000)
Available-for-sale securities	80,169,000	75,540,000
Other
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	993,000	991,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(7,000)	(9,000)
Continuous unrealized losses existing for greater than 12 months, fair value	0	0
Continuous unrealized losses existing for greater than 12 months, unrealized losses	0	0
Total, fair value	993,000	991,000
Total, unrealized losses	(7,000)	(9,000)
Available-for-sale securities	993,000	991,000
Residential mortgage-backed securities
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	2,212,780,000	333,879,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(519,164,000)	(1,170,000)
Continuous unrealized losses existing for greater than 12 months, fair value	1,327,534,000	2,374,724,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(34,123,000)	(445,614,000)
Total, fair value	3,540,314,000	2,708,603,000
Total, unrealized losses	(553,287,000)	(446,784,000)
Available-for-sale securities	3,553,638,000	3,059,620,000
Commercial (multi-family) mortgage-baked securities
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	3,134,000	9,953,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(390,000)	(289,000)
Continuous unrealized losses existing for greater than 12 months, fair value	12,204,000	0
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(365,000)	0
Total, fair value	15,338,000	9,953,000
Total, unrealized losses	(755,000)	(289,000)
Available-for-sale securities	18,332,000	12,980,000
Collateralized mortgage obligations
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	65,874,000	0
Continuous unrealized losses existing for less than 12 months, unrealized losses	(18,841,000)	0
Continuous unrealized losses existing for greater than 12 months, fair value	7,428,000	75,101,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(15,000)	(16,012,000)
Total, fair value	73,302,000	75,101,000
Total, unrealized losses	(18,856,000)	(16,012,000)
Available-for-sale securities	220,905,000	160,734,000
Mortgage Backed Securities, Subprime
Available-for-sale securities
Available-for-sale securities	$ 0	$ 0