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Investment Securities - Amortized Cost and Estimated Fair Value of Securities Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Due in one year or less, Amortized Cost | $ 32,120 |
Due in one year or less, Amortized Cost | 0 |
Due after one year through five years, Amortized Cost | 269,487 |
Due after one year through five years, Amortized Cost | 61,485 |
Due after five years through ten years, Amortized Cost | 365,430 |
Due after five years through ten years, Amortized Cost | 383,335 |
Due after ten years, Amortized Cost | 782,608 |
Due after ten years, Amortized Cost | 701,936 |
Amortized Cost | 3,210,489 | $ 3,410,272
Amortized Cost | 1,267,297 | 1,277,209
Estimated Fair Value |  |
Due in one year or less, Estimated Fair Value | 31,736 |
Due in one year or less, Estimated Fair Value | 0 |
Due after one year through five years, Estimated Fair Value | 257,215 |
Due after one year through five years, Estimated Fair Value | 59,214 |
Due after five years through ten years, Estimated Fair Value | 337,362 |
Due after five years through ten years, Estimated Fair Value | 349,945 |
Due after ten years, Estimated Fair Value | 695,201 |
Due after ten years, Estimated Fair Value | 602,597 |
Total, Estimated Fair Value | 2,899,968 | 3,072,639
Estimated Fair Value | 1,127,000 | 1,142,940
U.S. government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 1,409,549 |
Securities not due at a single maturity date, Amortized Cost | 120,541 |
Amortized Cost | 1,409,549 | 1,527,463
Amortized Cost | 120,541 | 124,169
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 1,239,329 |
Securities not due at a single maturity date, Estimated Fair Value | 115,244 |
Total, Estimated Fair Value | 1,239,329 | 1,324,684
Estimated Fair Value | 115,244 | 117,474
Private mortgage-backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 166,271 |
Securities not due at a single maturity date, Amortized Cost | 0 |
Amortized Cost | 166,271 | 184,643
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 155,582 |
Securities not due at a single maturity date, Estimated Fair Value | 0 |
Total, Estimated Fair Value | 155,582 | 171,394
Non-government-sponsored asset backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 185,024 |
Securities not due at a single maturity date, Amortized Cost | 0 |
Amortized Cost | 185,024 | 228,751
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 183,543 |
Securities not due at a single maturity date, Estimated Fair Value | 0 |
Total, Estimated Fair Value | $ 183,543 | $ 225,648

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