Investment Securities - Schedule of Available-for-sale Investment Securities Portfolios (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	$ 381,342,000	$ 1,328,178,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(1,981,000)	(105,511,000)
Continuous unrealized losses existing for greater than 12 months, fair value	2,628,705,000	1,774,421,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(478,443,000)	(421,617,000)
Total, fair value	3,010,047,000	3,102,599,000
Total, unrealized losses	(480,424,000)	(527,128,000)
Available-for-sale securities	3,502,915,000	3,243,017,000
U.S. government agencies
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	0	36,750,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	0	(3,250,000)
Continuous unrealized losses existing for greater than 12 months, fair value	45,124,000	7,436,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(4,876,000)	(2,564,000)
Total, fair value	45,124,000	44,186,000
Total, unrealized losses	(4,876,000)	(5,814,000)
Available-for-sale securities	45,124,000	74,222,000
Municipal
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	36,519,000	88,433,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(513,000)	(1,997,000)
Continuous unrealized losses existing for greater than 12 months, fair value	58,216,000	41,642,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(3,485,000)	(3,439,000)
Total, fair value	94,735,000	130,075,000
Total, unrealized losses	(3,998,000)	(5,436,000)
Available-for-sale securities	140,958,000	168,655,000
Financial issuers
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	0	14,420,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	0	(580,000)
Continuous unrealized losses existing for greater than 12 months, fair value	75,540,000	70,283,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(8,456,000)	(8,711,000)
Total, fair value	75,540,000	84,703,000
Total, unrealized losses	(8,456,000)	(9,291,000)
Available-for-sale securities	75,540,000	84,703,000
Other
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	991,000	0
Continuous unrealized losses existing for less than 12 months, unrealized losses	(9,000)	0
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	991,000	0
Total, unrealized losses	(9,000)	0
Available-for-sale securities	991,000	1,002,000
Residential mortgage-backed securities
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	333,879,000	1,185,885,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(1,170,000)	(99,494,000)
Continuous unrealized losses existing for greater than 12 months, fair value	2,374,724,000	1,578,200,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(445,614,000)	(389,301,000)
Total, fair value	2,708,603,000	2,764,085,000
Total, unrealized losses	(446,784,000)	(488,795,000)
Available-for-sale securities	3,059,620,000	2,819,937,000
Commercial (multi-family) mortgage-baked securities
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	9,953,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(289,000)
Continuous unrealized losses existing for greater than 12 months, fair value	0
Continuous unrealized losses existing for greater than 12 months, unrealized losses	0
Total, fair value	9,953,000
Total, unrealized losses	(289,000)
Available-for-sale securities	12,980,000	0
Collateralized mortgage obligations
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	0	2,690,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	0	(190,000)
Continuous unrealized losses existing for greater than 12 months, fair value	75,101,000	76,860,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(16,012,000)	(17,602,000)
Total, fair value	75,101,000	79,550,000
Total, unrealized losses	(16,012,000)	(17,792,000)
Available-for-sale securities	160,734,000	79,550,000
Mortgage Backed Securities, Subprime
Available-for-sale securities
Available-for-sale securities	$ 0	$ 0