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Investment Securities - Summary of Credit Quality Indicators of Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | $ 708,987 | $ 628,829
AA+ |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 706,216 |
AAA |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) |  | 626,095
Not Rated |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 2,771 | 2,734
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 49,190 | 73,044
U.S. Treasury securities | AA+ |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 49,190 |
U.S. Treasury securities | AAA |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) |  | 73,044
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 196,530 | 201,809
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | AA+ |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 196,530 |
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | AAA |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) |  | 201,809
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 460,496 | 351,242
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | AA+ |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 460,496 |
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | AAA |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) |  | 351,242
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 80 | 79
Municipal securities | Not Rated |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 80 | 79
Corporate debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 1,962 | 1,843
Corporate debt | Not Rated |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 1,962 | 1,843
Other securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | 729 | 812
Other securities | Not Rated |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available-for-sale (at fair value) | $ 729 | $ 812

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