Debt Securities - Maturity Schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Available-for-Sale, Amortized Cost
Due within one year	$ 321,716
Due after one year through five years	519,869
Due after five years through ten years	21,731
Due after ten years	31,175
Total before mortgage-backed securities	894,491
Mortgage-backed securities	3,761,819
Amortized Cost	4,656,310	$ 5,283,253
Available-for-Sale, Fair Value
Due within one year	313,311
Due after one year through five years	498,840
Due after five years through ten years	20,189
Due after ten years	29,430
Total before mortgage-backed securities	861,770
Mortgage-backed securities	3,383,435
Fair Value	4,245,205	4,785,719
Held-to-Maturity, Amortized Cost
Due within one year	9,584
Due after one year through five years	941,501
Due after five years through ten years	209,288
Due after ten years	1,318,909
Total before mortgage-backed securities	2,479,282
Mortgage-backed securities	815,565
Amortized Cost	3,294,847	3,502,411
Held-to-Maturity, Fair Value
Due within one year	9,566
Due after one year through five years	885,563
Due after five years through ten years	198,057
Due after ten years	1,122,908
Total before mortgage-backed securities	2,216,094
Mortgage-backed securities	752,476
Fair Value	$ 2,968,570	$ 3,180,194