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Investment Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investment Securities HTM, Fair Value
Total	$ 2,524,525
Investment Securities AFS, Amortized Cost
Amortized Cost	8,079,918	$ 11,091,254
Investment Securities AFS, Fair Value
Total	7,551,018	9,788,662
Mortgage-backed securities issued by U.S. Government sponsored enterprises
Investment Securities HTM, Amortized Cost
Within One Year	0
1 to 5 Years	0
5 to 10 Years	0
More Than 10 Years	2,581,469
Total	2,581,469
Investment Securities HTM, Fair Value
Within One Year	0
1 to 5 Years	0
5 to 10 Years	0
More Than 10 Years	2,524,525
Total	2,524,525
Investment Securities AFS, Amortized Cost
Within One Year	0
1 to 5 Years	0
5 to 10 Years	0
More Than 10 Years	2,294,700
Amortized Cost	2,294,700	7,523,399
Investment Securities AFS, Fair Value
Within One Year	0
1 to 5 Years	0
5 to 10 Years	0
More Than 10 Years	2,034,035
Total	2,034,035	6,430,379
U.S. Treasury securities
Investment Securities AFS, Amortized Cost
Within One Year	52,316
1 to 5 Years	824,797
5 to 10 Years	337,250
More Than 10 Years	0
Amortized Cost	1,214,363	588,082
Investment Securities AFS, Fair Value
Within One Year	52,500
1 to 5 Years	825,478
5 to 10 Years	334,764
More Than 10 Years	0
Total	1,212,742	597,629
U.S. Government agency securities
Investment Securities AFS, Amortized Cost
Within One Year	0
1 to 5 Years	29,993
5 to 10 Years	0
More Than 10 Years	0
Amortized Cost	29,993	29,993
Investment Securities AFS, Fair Value
Within One Year	0
1 to 5 Years	29,163
5 to 10 Years	0
More Than 10 Years	0
Total	29,163	28,940
Mortgage-backed securities issued by U.S. Government agencies
Investment Securities AFS, Amortized Cost
Within One Year	0
1 to 5 Years	45
5 to 10 Years	3
More Than 10 Years	1,583,283
Amortized Cost	1,583,331	1,021,612
Investment Securities AFS, Fair Value
Within One Year	0
1 to 5 Years	44
5 to 10 Years	3
More Than 10 Years	1,462,743
Total	1,462,790	925,664
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Investment Securities AFS, Amortized Cost
Within One Year	0
1 to 5 Years	21
5 to 10 Years	8,511
More Than 10 Years	648,921
Amortized Cost	657,453	692,487
Investment Securities AFS, Fair Value
Within One Year	0
1 to 5 Years	21
5 to 10 Years	8,228
More Than 10 Years	541,952
Total	550,201	587,595
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises
Investment Securities AFS, Amortized Cost
Within One Year	0
1 to 5 Years	1,256,041
5 to 10 Years	1,017,900
More Than 10 Years	17,027
Amortized Cost	2,290,968	1,226,672
Investment Securities AFS, Fair Value
Within One Year	0
1 to 5 Years	1,244,187
5 to 10 Years	994,408
More Than 10 Years	14,521
Total	2,253,116	1,209,783
Corporate debt securities and other debt securities
Investment Securities AFS, Amortized Cost
Within One Year	0
1 to 5 Years	9,110
5 to 10 Years	0
More Than 10 Years	0
Amortized Cost	9,110	9,009
Investment Securities AFS, Fair Value
Within One Year	0
1 to 5 Years	8,971
5 to 10 Years	0
More Than 10 Years	0
Total	$ 8,971	$ 8,672

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