Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 125,366	$ 121,522	$ 105,680
Charge-offs	(11,051)	(4,051)	(8,140)
Recoveries	1,129	1,413	1,527
Provision for (Benefit From) Credit Losses	10,318	6,482	22,455
Ending Balance	125,762	125,366	121,522
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	6,000	5,850	4,315
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit From) Credit Losses	1,745	150	1,535
Ending Balance	7,745	6,000	5,850
Credit Loss [Roll Forward]
Beginning Balance	131,366	127,372	109,995
Charge-offs	(11,051)	(4,051)	(8,140)
Recoveries	1,129	1,413	1,527
Provision for (Benefit From) Credit Losses	12,063	6,632	23,990
Ending Balance	133,507	131,366	127,372
Total commercial real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	72,849	68,864	61,381
Charge-offs	(1,053)	0	(3,637)
Recoveries	3	189	2
Provision for (Benefit From) Credit Losses	3,733	3,796	11,118
Ending Balance	75,532	72,849	68,864
Total consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	27,463	27,453	24,639
Charge-offs	(649)	(814)	(624)
Recoveries	170	612	1,175
Provision for (Benefit From) Credit Losses	(701)	212	2,263
Ending Balance	26,283	27,463	27,453
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	14,397	12,750	13,597
Charge-offs	(9,338)	(1,787)	(3,879)
Recoveries	291	547	316
Provision for (Benefit From) Credit Losses	6,080	2,887	2,716
Ending Balance	11,430	14,397	12,750
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,224	8,856	5,142
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit From) Credit Losses	1,007	(1,632)	3,714
Ending Balance	8,231	7,224	8,856
Agriculture production
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,403	3,589	906
Charge-offs	(11)	(1,450)	0
Recoveries	665	65	34
Provision for (Benefit From) Credit Losses	208	1,199	2,649
Ending Balance	4,265	3,403	3,589
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	30	10	15
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit From) Credit Losses	(9)	20	(5)
Ending Balance	21	30	10
CRE non-owner occupied \| Total commercial real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	37,229	35,077	30,962
Charge-offs	0	0	0
Recoveries	2	187	0
Provision for (Benefit From) Credit Losses	3,069	1,965	4,115
Ending Balance	40,300	37,229	35,077
CRE owner occupied \| Total commercial real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	15,747	15,081	14,014
Charge-offs	0	0	(3,637)
Recoveries	1	2	2
Provision for (Benefit From) Credit Losses	(3,036)	664	4,702
Ending Balance	12,712	15,747	15,081
Multifamily \| Total commercial real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	15,913	14,418	13,132
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for (Benefit From) Credit Losses	1,414	1,495	1,286
Ending Balance	17,327	15,913	14,418
Farmland \| Total commercial real estate loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,960	4,288	3,273
Charge-offs	(1,053)	0	0
Recoveries	0	0	0
Provision for (Benefit From) Credit Losses	2,286	(328)	1,015
Ending Balance	5,193	3,960	4,288
SFR 1-4 1st DT liens \| Total consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	14,227	14,009	11,268
Charge-offs	0	(27)	0
Recoveries	6	0	262
Provision for (Benefit From) Credit Losses	(3,188)	245	2,479
Ending Balance	11,045	14,227	14,009
SFR HELOCs and junior liens \| Total consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10,411	10,273	11,413
Charge-offs	0	(41)	(66)
Recoveries	26	395	723
Provision for (Benefit From) Credit Losses	2,827	(216)	(1,797)
Ending Balance	13,264	10,411	10,273
Other \| Total consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,825	3,171	1,958
Charge-offs	(649)	(746)	(558)
Recoveries	138	217	190
Provision for (Benefit From) Credit Losses	(340)	183	1,581
Ending Balance	$ 1,974	$ 2,825	$ 3,171

TRICO BANCSHARES / 10-K