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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, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale |  |
Amortized cost within one year | $ 5,449 |
Amortized cost one to five years | 364,641 |
Amortized cost for five to ten years | 192,161 |
Amortized cost for after ten years | 238,433 |
Amortized cost, available for sale | 800,684 |
Total available for sale investment securities, amortized cost | 1,024,622 | $ 1,137,702
Fair value within one year | 5,329 |
Fair value for one to five years | 330,882 |
Fair value for five to ten years | 153,784 |
Fair value for after ten years | 187,971 |
Fair value, available for sale | 677,966 |
Fair value, available for sale, mortgage obligations and backed pools | 865,168 | 997,558
Held to maturity |  |
Within one year, amortized cost | 35,434 |
One to five years, amortized cost | 228,119 |
Five to ten years, amortized cost | 340,018 |
After ten years, amortized cost | 948,937 |
Amortized cost, held to maturity | 1,552,508 |
Amortized cost, held to maturity, mortgage obligations and backed pools | 1,966,483 | 2,022,748
Within one year, fair value | 35,149 |
One to five years, fair value | 212,226 |
Five to ten years, fair value | 278,547 |
After ten years, fair value | 696,891 |
Fair value, held to maturity | 1,222,813 |
Fair value, held to maturity, mortgage obligations and backed pools | 1,556,845 | 1,681,309
Federal agency collateralized mortgage obligations |  |
Available for sale |  |
Amortized cost, available for sale, mortgage obligations and backed pools | 23,210 |
Total available for sale investment securities, amortized cost | 23,210 | 33,011
Fair value, available for sale, mortgage obligations and backed pools | 21,313 | 31,215
Held to maturity |  |
Amortized cost, held to maturity, mortgage obligations and backed pools | 52,573 | 56,564
Fair value, held to maturity, mortgage obligations and backed pools | 42,677 | 47,699
Federal agency mortgage-backed pools |  |
Available for sale |  |
Amortized cost, available for sale, mortgage obligations and backed pools | 200,728 |
Total available for sale investment securities, amortized cost | 200,728 | 220,963
Fair value, available for sale, mortgage obligations and backed pools | 165,889 | 190,656
Held to maturity |  |
Amortized cost, held to maturity, mortgage obligations and backed pools | 328,410 | 343,953
Fair value, held to maturity, mortgage obligations and backed pools | 264,057 | 287,239
Private labeled mortgage-backed pools |  |
Held to maturity |  |
Amortized cost, held to maturity, mortgage obligations and backed pools | 32,992 | 35,466
Fair value, held to maturity, mortgage obligations and backed pools | $ 27,298 | $ 29,973

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