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TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest expense | $ (4,089) | $ (2,260) | $ (1,909) | $ (1,271) | $ (1,241) | $ (1,395) | $ (1,396) | $ (1,476) | $ (9,529) | $ (5,508) | $ (9,457)
Income before income taxes | 51,066 | 51,486 | 43,112 | 28,243 | 38,626 | 38,956 | 39,129 | 46,992 | 173,907 | 163,703 | 87,350
Equity in net income of Tri Counties Bank: |  |  |  |  |  |  |  |  |  |  |
Income tax benefit | (14,723) | (14,148) | (11,748) | (7,869) | (10,404) | (11,534) | (10,767) | (13,343) | (48,488) | (46,048) | (22,536)
Net income | $ 36,343 | $ 37,338 | $ 31,364 | $ 20,374 | $ 28,222 | $ 27,422 | $ 28,362 | $ 33,649 | 125,419 | 117,655 | 64,814
Parent |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest expense |  |  |  |  |  |  |  |  | (4,385) | (2,128) | (2,555)
Administration expense |  |  |  |  |  |  |  |  | (816) | (985) | (932)
Income before income taxes |  |  |  |  |  |  |  |  | (5,201) | (3,113) | (3,487)
Equity in net income of Tri Counties Bank: |  |  |  |  |  |  |  |  |  |  |
Distributed |  |  |  |  |  |  |  |  | 64,188 | 31,571 | 63,419
Undistributed |  |  |  |  |  |  |  |  | 64,896 | 88,289 | 3,851
Income tax benefit |  |  |  |  |  |  |  |  | 1,536 | 908 | 1,031
Net income |  |  |  |  |  |  |  |  | $ 125,419 | $ 117,655 | $ 64,814

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