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Fair Value Measurement - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers between any levels	$ 0	$ 0
Carrying value of loans fully charged-off	0tcbk_LoanChargedOffCarryingValue
Securities held to maturity	802,482,000us-gaap_HeldToMaturitySecurities	676,426,000us-gaap_HeldToMaturitySecurities
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity	$ 0	$ 0

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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