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Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale |  |
Amortized cost within one year | $ 31,763 | $ 0
Amortized cost one to five years | 49,247 | 0
Amortized cost for five to ten years | 76,478 | 173,533
Amortized cost for after ten years | 277,388 | 90,505
Amortized cost, available for sale | 434,876 | 264,038
Amortized Cost | 926,083 | 282,022
Fair value within one year | 31,797 | 0
Fair value for one to five years | 48,529 | 0
Fair value for five to ten years | 68,141 | 141,915
Fair value for after ten years | 240,873 | 77,219
Fair value, available for sale | 389,340 | 219,134
Total available for sale investment securities, amortized cost, fair value | 883,242 | 233,677
Held to maturity |  |
Within one year, amortized cost | 0 | 59,129
One to five years, amortized cost | 0 | 298,362
Five to ten years, amortized cost | 0 | 366,493
After ten years, amortized cost | 0 | 764,860
Amortized cost, held to maturity | 0 | 1,488,844
Amortized Cost | 0 | 1,867,848
Within one year, fair value | 0 | 58,304
One to five years, fair value | 0 | 278,007
five to ten years, fair value | 0 | 312,748
After ten years, fair value | 0 | 597,067
Fair value, held to maturity | 0 | 1,246,126
Fair value, held to maturity | 0 | 1,566,268
U.S. government agency mortgage-backed securities |  |
Available for sale |  |
Amortized cost, available for sale, mortgage obligations | 491,207 | 17,984
Amortized Cost | 491,207 | 17,984
Fair value, available for sale, without single maturity | 493,902 | 14,543
Total available for sale investment securities, amortized cost, fair value | 493,902 | 14,543
Held to maturity |  |
Without a single maturity date, amortized cost | 0 | 349,726
Amortized Cost | 0 | 349,726
Without a single maturity date, fair value | 0 | 294,822
Fair value, held to maturity | 0 | 294,822
Private labeled mortgage-backed pools |  |
Held to maturity |  |
Without a single maturity date, amortized cost | 0 | 29,278
Amortized Cost | 0 | 29,278
Without a single maturity date, fair value | 0 | 25,320
Fair value, held to maturity | $ 0 | $ 25,320

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