Investment Securities - Schedule of Restricted Equity Securities, At Cost (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Total restricted equity securities, at cost	$ 36,231	$ 32,749
FHLB stock
Debt and Equity Securities, FV-NI [Line Items]
Total restricted equity securities, at cost	34,813	32,749
First National Banker's Bankshares, Inc. stock
Debt and Equity Securities, FV-NI [Line Items]
Total restricted equity securities, at cost	1,168	0
Pacific Coast Banker's Bank stock
Debt and Equity Securities, FV-NI [Line Items]
Total restricted equity securities, at cost	$ 250	$ 0