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Related Party Transactions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Related Party Transaction [Line Items]          
Deposits from related parties $ 298,186   $ 298,186   $ 347,660
Amortized cost 1,645,373   1,645,373   1,705,574
Manufactured loan housing securities          
Related Party Transaction [Line Items]          
Master loan purchase agreement, maximum amount 250,000   $ 250,000    
Loan purchase agreement, term     5 years    
Loans purchased 6,449   $ 6,449    
Amortized cost 6,441   6,441    
Purchase agreements         0
Preferred Stock          
Related Party Transaction [Line Items]          
Equity security without readily determinable market value 10,000   10,000   10,000
Directors          
Related Party Transaction [Line Items]          
Operating lease expense 103 $ 100 193 $ 201  
Directors | FBK Aviation, LLC | Aviation Time Sharing Agreements          
Related Party Transaction [Line Items]          
Income from related party 4 $ 8 11 $ 19  
Unfunded Loan Commitment | Certain Executive Officers, Certain Management and Directors and Their Associates          
Related Party Transaction [Line Items]          
Unfunded commitments $ 53,589   $ 53,589   $ 31,564