Borrowings - Schedule of Subordinated Debentures (Detail) - Trust Preferred Securities [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument Redemption [Line Items]
Subordinated debentures contractual balance	$ 28,352	$ 28,352
Subordinated debentures fair market value adjustments	(3,951)	(4,044)
Total subordinated notes	24,401	24,308
FCB Capital Trust II [Member]
Debt Instrument Redemption [Line Items]
Subordinated debentures contractual balance	$ 10,310	$ 10,310
Subordinated debentures, Weighted Average Rate	5.93%	6.17%
Subordinated debentures, Weighted Average Term	9 years 1 month 6 days	9 years 3 months 18 days
FCB Capital Trust III [Member]
Debt Instrument Redemption [Line Items]
Subordinated debentures contractual balance	$ 5,155	$ 5,155
Subordinated debentures, Weighted Average Rate	5.82%	5.87%
Subordinated debentures, Weighted Average Term	11 years 2 months 12 days	11 years 6 months
Community First Statutory Trust I [Member]
Debt Instrument Redemption [Line Items]
Subordinated debentures contractual balance	$ 5,155	$ 5,155
Subordinated debentures, Weighted Average Rate	7.22%	7.20%
Subordinated debentures, Weighted Average Term	6 years 8 months 12 days	7 years
American State Bank Statutory Trust I [Member]
Debt Instrument Redemption [Line Items]
Subordinated debentures contractual balance	$ 7,732	$ 7,732
Subordinated debentures, Weighted Average Rate	5.74%	5.78%
Subordinated debentures, Weighted Average Term	9 years 6 months	9 years 8 months 12 days