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Related Party Transactions - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |
Deposits from related parties | $ 184,108,000 |  | $ 184,108,000 |  | $ 316,141,000
Other income | 2,465,000 | $ 1,456,000 | 8,786,000 | $ 7,491,000 |
Equity method investments | 20,000,000 |  | 20,000,000 |  |
Amortized cost | 1,673,079,000 |  | 1,673,079,000 |  | 1,658,779,000
Manufactured loan housing securities |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Mater loan purchase agreement, maximum capacity | 250,000 |  | $ 250,000 |  |
Master loan purchase agreement, term |  |  | 5 years |  |
Loans purchased | 16,970,000 | 12,676,000 | $ 43,776,000 | 19,125,000 |
Amortized cost | 73,808,000 |  | 73,808,000 |  | 32,154,000
Preferred Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity method investments | 20,000,000 |  | 20,000,000 |  |
Equity security without readily determinable market value |  |  |  |  | 10,000,000
Directors |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Operating lease expense | 100,000 | 102,000 | 311,000 | 295,000 |
Directors | FBK Aviation, LLC | Aviation Time Sharing Agreements |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Other income | 3,000 | $ 15,000 | 46,000 | $ 26,000 |
Unfunded Loan Commitment | Certain Executive Officers, Certain Management and Directors and Their Associates |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Unfunded commitments | $ 30,044,000 |  | $ 30,044,000 |  | $ 44,206,000

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