Stock Options and Other Equity-Based Incentive Instruments (Details Textual) (USD $)	12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 2009 Plan [Member]	Dec. 31, 2012 2001 Plan [Member]	Dec. 31, 2009 2001 Plan [Member]
Stock Options and Other Equity-Based Incentive Instruments (Textual) [Abstract]
Number of shares to be reduced pursuant to stock option for computation of available number of shares for issuance			1
Number of shares to be reduced pursuant to restricted stock award for computation of available number of shares for issuance			2
Share based compensation grant expiry period				10 years
Outstanding options under the plan	1,393,935	1,250,935	578,000	815,935
Options available for grant under the plan			72,000		0
Stock Options and Other Equity Based Incentive Instruments (Additional Textual) [Abstract]
Maximum aggregate number of shares of TriCo's common stock issued	650,000
Options currently not exercisable yet expected to vest	426,060
Weighted-average remaining contractual term	2 years 1 month 21 days
Pre-tax compensation costs expected to recognize	$ 2,766,000