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Investment Securities - Amortized Cost and Estimated Fair Value of Securities Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less, Amortized Cost | $ 29,837 |
Due in one year or less, Amortized Cost | 0 |
Due after one year through five years, Amortized Cost | 256,357 |
Due after one year through five years, Amortized Cost | 43,548 |
Due after five years through ten years, Amortized Cost | 377,774 |
Due after five years through ten years, Amortized Cost | 341,352 |
Due after ten years, Amortized Cost | 839,514 |
Due after ten years, Amortized Cost | 768,275 |
Amortized Cost | 3,529,325 | $ 3,840,927
Amortized Cost | 1,279,095 | 1,283,987
Estimated Fair Value |  |
Due in one year or less, Estimated Fair Value | 29,449 |
Due in one year or less, Estimated Fair Value | 0 |
Due after one year through five years, Estimated Fair Value | 245,060 |
Due after one year through five years, Estimated Fair Value | 42,380 |
Due after five years through ten years, Estimated Fair Value | 346,905 |
Due after five years through ten years, Estimated Fair Value | 321,196 |
Due after ten years, Estimated Fair Value | 783,602 |
Due after ten years, Estimated Fair Value | 706,493 |
Total, Estimated Fair Value | 3,270,620 | 3,507,841
Estimated Fair Value | 1,194,455 | 1,170,481
U.S. government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 1,574,430 |
Securities not due at a single maturity date, Amortized Cost | 125,920 |
Amortized Cost | 1,574,430 | 1,711,668
Amortized Cost | 125,920 | 130,278
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 1,425,465 |
Securities not due at a single maturity date, Estimated Fair Value | 124,386 |
Total, Estimated Fair Value | 1,425,465 | 1,520,421
Estimated Fair Value | 124,386 | 126,022
Private mortgage-backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 186,916 |
Securities not due at a single maturity date, Amortized Cost | 0 |
Amortized Cost | 186,916 | 191,522
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 177,941 |
Securities not due at a single maturity date, Estimated Fair Value | 0 |
Total, Estimated Fair Value | 177,941 | 175,405
Non-government-sponsored asset backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 264,497 |
Securities not due at a single maturity date, Amortized Cost | 0 |
Amortized Cost | 264,497 | 370,203
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 262,198 |
Securities not due at a single maturity date, Estimated Fair Value | 0 |
Total, Estimated Fair Value | $ 262,198 | $ 363,473

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