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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Deposits from related parties	$ 338,935		$ 316,141
Other income	1,710	$ 3,550
Master loan purchase agreement, maximum amount	250
Amortized cost	$ 1,648,280		1,658,779
Manufactured loan housing securities
Related Party Transaction [Line Items]
Loan purchase agreement, term	5 years
Loans purchased	$ 9,225	0
Amortized cost	41,048		32,154
Preferred Stock
Related Party Transaction [Line Items]
Equity security without readily determinable market value	10,000		10,000
Directors
Related Party Transaction [Line Items]
Operating lease expense	90	90
Directors | FBK Aviation, LLC | Aviation Time Sharing Agreements
Related Party Transaction [Line Items]
Other income	24	$ 7
Unfunded Loan Commitment | Certain Executive Officers, Certain Management and Directors and Their Associates
Related Party Transaction [Line Items]
Unfunded commitments	$ 54,212		$ 44,206

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