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Investment Securities - Amortized Cost and Estimated Fair Value of Securities Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Due in one year or less, Amortized Cost | $ 32,853 |
Due in one year or less, Amortized Cost | 0 |
Due after one year through five years, Amortized Cost | 257,956 |
Due after one year through five years, Amortized Cost | 104,620 |
Due after five years through ten years, Amortized Cost | 394,695 |
Due after five years through ten years, Amortized Cost | 364,055 |
Due after ten years, Amortized Cost | 773,232 |
Due after ten years, Amortized Cost | 678,868 |
Amortized Cost | 3,163,880 | $ 3,410,272
Amortized Cost | 1,266,205 | 1,277,209
Estimated Fair Value |  |
Due in one year or less, Estimated Fair Value | 32,425 |
Due in one year or less, Estimated Fair Value | 0 |
Due after one year through five years, Estimated Fair Value | 247,955 |
Due after one year through five years, Estimated Fair Value | 101,940 |
Due after five years through ten years, Estimated Fair Value | 375,621 |
Due after five years through ten years, Estimated Fair Value | 338,975 |
Due after ten years, Estimated Fair Value | 708,505 |
Due after ten years, Estimated Fair Value | 600,559 |
Total, Estimated Fair Value | 2,924,496 | 3,072,639
Estimated Fair Value | 1,157,119 | 1,142,940
U.S. government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 1,378,237 |
Securities not due at a single maturity date, Amortized Cost | 118,662 |
Amortized Cost | 1,378,237 | 1,527,463
Amortized Cost | 118,662 | 124,169
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 1,241,056 |
Securities not due at a single maturity date, Estimated Fair Value | 115,645 |
Total, Estimated Fair Value | 1,241,056 | 1,324,684
Estimated Fair Value | 115,645 | 117,474
Private mortgage-backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 155,155 |
Securities not due at a single maturity date, Amortized Cost | 0 |
Amortized Cost | 155,155 | 184,643
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 147,901 |
Securities not due at a single maturity date, Estimated Fair Value | 0 |
Total, Estimated Fair Value | 147,901 | 171,394
Non-government-sponsored asset backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 171,752 |
Securities not due at a single maturity date, Amortized Cost | 0 |
Amortized Cost | 171,752 | 228,751
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 171,033 |
Securities not due at a single maturity date, Estimated Fair Value | 0 |
Total, Estimated Fair Value | $ 171,033 | $ 225,648

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