v3.26.3
Related Party Transactions - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
boardSeat
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
boardSeat
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Related Party Transaction [Line Items]          
Deposits from related parties $ 141,207   $ 141,207   $ 406,258
Other income $ 2,713 $ 2,121 $ 8,181 $ 6,009  
Number of board seats, privately held entity | boardSeat 2   2    
Amortized cost $ 1,623,908   $ 1,623,908   1,507,466
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 5,765 17,770 $ 25,611 45,780  
Amortized cost 158,331   158,331   142,532
Directors          
Related Party Transaction [Line Items]          
Operating lease expense 47 101 250 301  
Directors | FBK Aviation, LLC | Aviation Time Sharing Agreements          
Related Party Transaction [Line Items]          
Other income 14 $ 18 84 $ 43  
Unfunded Loan Commitment | Certain Executive Officers, Certain Management and Directors and Affiliates          
Related Party Transaction [Line Items]          
Unfunded commitments $ 28,438   $ 28,438   $ 47,182