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Investment Securities - Amortized Cost and Estimated Fair Value of Securities Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less, Amortized Cost | $ 21,983 |
Due in one year or less, Amortized Cost | 0 |
Due after one year through five years, Amortized Cost | 242,321 |
Due after one year through five years, Amortized Cost | 32,900 |
Due after five years through ten years, Amortized Cost | 406,876 |
Due after five years through ten years, Amortized Cost | 319,351 |
Due after ten years, Amortized Cost | 851,977 |
Due after ten years, Amortized Cost | 801,143 |
Amortized Cost | 3,691,868 | $ 3,840,927
Amortized Cost | 1,280,858 | 1,283,987
Estimated Fair Value |  |
Due in one year or less, Estimated Fair Value | 21,854 |
Due in one year or less, Estimated Fair Value | 0 |
Due after one year through five years, Estimated Fair Value | 226,640 |
Due after one year through five years, Estimated Fair Value | 30,933 |
Due after five years through ten years, Estimated Fair Value | 364,876 |
Due after five years through ten years, Estimated Fair Value | 289,436 |
Due after ten years, Estimated Fair Value | 783,762 |
Due after ten years, Estimated Fair Value | 717,364 |
Total, Estimated Fair Value | 3,344,539 | 3,507,841
Estimated Fair Value | 1,159,160 | 1,170,481
U.S. government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 1,621,192 |
Securities not due at a single maturity date, Amortized Cost | 127,464 |
Amortized Cost | 1,621,192 | 1,711,668
Amortized Cost | 127,464 | 130,278
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 1,420,475 |
Securities not due at a single maturity date, Estimated Fair Value | 121,427 |
Total, Estimated Fair Value | 1,420,475 | 1,520,421
Estimated Fair Value | 121,427 | 126,022
Private mortgage-backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 188,551 |
Securities not due at a single maturity date, Amortized Cost | 0 |
Amortized Cost | 188,551 | 191,522
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 173,133 |
Securities not due at a single maturity date, Estimated Fair Value | 0 |
Total, Estimated Fair Value | 173,133 | 175,405
Non-government-sponsored asset backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 358,968 |
Securities not due at a single maturity date, Amortized Cost | 0 |
Amortized Cost | 358,968 | 370,203
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 353,799 |
Securities not due at a single maturity date, Estimated Fair Value | 0 |
Total, Estimated Fair Value | $ 353,799 | $ 363,473

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