Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) $ in Thousands	Mar. 31, 2026 USD ($) security	Dec. 31, 2025 USD ($) security
Fair Value
Less Than 12 Months	$ 2,547,855	$ 1,079,884
12 Months or Longer	675,733	961,014
Total	3,223,588	2,040,898
Unrealized Losses
Less Than 12 Months	(21,670)	(4,059)
12 Months or Longer	(109,421)	(146,326)
Total	$ (131,091)	$ (150,385)
Number of individual securities | security	490	383
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	$ 36,554	$ 21,846
12 Months or Longer	12,026	13,932
Total	48,580	35,778
Unrealized Losses
Less Than 12 Months	(387)	(31)
12 Months or Longer	(388)	(420)
Total	(775)	(451)
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	1,597,196	378,739
12 Months or Longer	449,907	730,551
Total	2,047,103	1,109,290
Unrealized Losses
Less Than 12 Months	(12,433)	(1,625)
12 Months or Longer	(98,125)	(133,763)
Total	(110,558)	(135,388)
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	82,032	90,765
12 Months or Longer	78,322	95,090
Total	160,354	185,855
Unrealized Losses
Less Than 12 Months	(164)	(61)
12 Months or Longer	(4,405)	(5,867)
Total	(4,569)	(5,928)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	0	969
12 Months or Longer	73,226	76,829
Total	73,226	77,798
Unrealized Losses
Less Than 12 Months	0	(1)
12 Months or Longer	(4,978)	(5,009)
Total	(4,978)	(5,010)
CLOs
Fair Value
Less Than 12 Months	341,087	211,052
12 Months or Longer	56,600	38,882
Total	397,687	249,934
Unrealized Losses
Less Than 12 Months	(1,883)	(320)
12 Months or Longer	(371)	(192)
Total	(2,254)	(512)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	293,912	244,168
12 Months or Longer	5,652	5,730
Total	299,564	249,898
Unrealized Losses
Less Than 12 Months	(4,870)	(1,445)
12 Months or Longer	(1,154)	(1,075)
Total	(6,024)	(2,520)
Other debt securities
Fair Value
Less Than 12 Months	197,074	132,345
12 Months or Longer	0	0
Total	197,074	132,345
Unrealized Losses
Less Than 12 Months	(1,933)	(576)
12 Months or Longer	0	0
Total	$ (1,933)	$ (576)