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Discounts to principal balance of loans owned net of charge offs.

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Loans and leases receivable construction.

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Noncovered loans.

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Principal balance of loans owed net of charge offs.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of commercial loans and leases receivable includes, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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Total carrying amount of mortgage loans as of the balance sheet date.

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Loans - Summary of Loan Balances (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Mortgage loans on real estate:
Total mortgage loan on real estate	$ 1,646,863us-gaap_MortgageLoansOnRealEstate	$ 1,615,359us-gaap_MortgageLoansOnRealEstate
Consumer:
Total consumer loans	410,727	417,084
Commercial	177,540	174,945
Construction:
Total construction	85,753	75,136
Total loans, net of deferred loan fees and discounts	2,320,883	2,282,524
Total principal balance of loans owed, net of charge-offs	2,359,282	2,322,853
Unamortized net deferred loan fees	(4,810)	(4,793)
Discounts to principal balance of loans owed, net of charge-offs	(33,589)	(35,536)
Total loans, net of unamortized deferred loan fees and discounts	2,320,883us-gaap_LoansReceivableNet	2,282,524us-gaap_LoansReceivableNet
Noncovered loans	2,300,463tcbk_NoncoveredLoans	2,260,256tcbk_NoncoveredLoans
Covered loans	20,420	22,268
Total loans, net of unamortized deferred loan fees and discounts	2,320,883	2,282,524
Allowance for loan losses	(36,055)	(36,585)	(38,322)	(38,245)
Auto Indirect [Member]
Consumer:
Total consumer loans	32	112
Other [Member]
Consumer:
Total consumer loans	32,999	33,074
Residential 1-4 family [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	282,383	279,420
Commercial [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	1,364,480	1,335,939
Construction:
Total construction	45,648	36,518
Home equity lines of credit [Member]
Consumer:
Total consumer loans	345,210	352,584
Construction:
Allowance for loan losses	(15,233)	(15,676)	(16,366)	(16,375)
Home equity loans [Member]
Consumer:
Total consumer loans	32,486	31,314
Residential [Member]
Construction:
Total construction	40,105	38,618
Originated [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	1,130,474	1,083,391
Consumer:
Total consumer loans	354,962	357,067
Commercial	134,055	126,611
Construction:
Total construction	56,222	45,680
Total loans, net of deferred loan fees and discounts	1,675,713	1,612,749
Total principal balance of loans owed, net of charge-offs	1,680,523	1,617,542
Unamortized net deferred loan fees	(4,810)	(4,793)
Total loans, net of unamortized deferred loan fees and discounts	1,675,713	1,612,749
Noncovered loans	1,675,713	1,612,749
Total loans, net of unamortized deferred loan fees and discounts	1,675,713	1,612,749
Allowance for loan losses	(30,032)	(29,860)
Originated [Member] \| Auto Indirect [Member]
Consumer:
Total consumer loans	32	112
Originated [Member] \| Other [Member]
Consumer:
Total consumer loans	28,740	28,230
Originated [Member] \| Residential 1-4 family [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	160,041	154,594
Originated [Member] \| Commercial [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	970,433	928,797
Construction:
Total construction	32,558	24,545
Originated [Member] \| Home equity lines of credit [Member]
Consumer:
Total consumer loans	299,298	305,166
Originated [Member] \| Home equity loans [Member]
Consumer:
Total consumer loans	26,892	23,559
Originated [Member] \| Residential [Member]
Construction:
Total construction	23,664	21,135
PNCI [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	484,412	497,046
Consumer:
Total consumer loans	45,983	50,152
Commercial	36,429	40,899
Construction:
Total construction	28,795	28,781
Total loans, net of deferred loan fees and discounts	595,619	616,878
Total principal balance of loans owed, net of charge-offs	612,382	634,490
Discounts to principal balance of loans owed, net of charge-offs	(16,763)	(17,612)
Total loans, net of unamortized deferred loan fees and discounts	595,619	616,878
Noncovered loans	595,619	616,878
Total loans, net of unamortized deferred loan fees and discounts	595,619	616,878
Allowance for loan losses	(2,925)	(3,296)
PNCI [Member] \| Other [Member]
Consumer:
Total consumer loans	4,189	4,770
PNCI [Member] \| Residential 1-4 family [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	118,316	120,821
PNCI [Member] \| Commercial [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	366,096	376,225
Construction:
Total construction	13,090	11,973
PNCI [Member] \| Home equity lines of credit [Member]
Consumer:
Total consumer loans	36,953	38,397
PNCI [Member] \| Home equity loans [Member]
Consumer:
Total consumer loans	4,841	6,985
PNCI [Member] \| Residential [Member]
Construction:
Total construction	15,705	16,808
PCI - Cash basis [Member]
Consumer:
Total consumer loans	5,583	5,603
Commercial	6	8
Construction:
Total loans, net of deferred loan fees and discounts	5,589	5,611
Total principal balance of loans owed, net of charge-offs	14,592	14,805
Discounts to principal balance of loans owed, net of charge-offs	(9,003)	(9,194)
Total loans, net of unamortized deferred loan fees and discounts	5,589	5,611
Noncovered loans	5,589	5,611
Total loans, net of unamortized deferred loan fees and discounts	5,589	5,611
Allowance for loan losses	(340)	(348)
PCI - Cash basis [Member] \| Home equity lines of credit [Member]
Consumer:
Total consumer loans	5,459	5,478
PCI - Cash basis [Member] \| Home equity loans [Member]
Consumer:
Total consumer loans	124	125
PCI - Other [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	31,977	34,922
Consumer:
Total consumer loans	4,199	4,262
Commercial	7,050	7,427
Construction:
Total construction	736	675
Total loans, net of deferred loan fees and discounts	43,962	47,286
Total principal balance of loans owed, net of charge-offs	51,785	56,016
Discounts to principal balance of loans owed, net of charge-offs	(7,823)	(8,730)
Total loans, net of unamortized deferred loan fees and discounts	43,962	47,286
Noncovered loans	23,542	25,018
Covered loans	20,420	22,268
Total loans, net of unamortized deferred loan fees and discounts	43,962	47,286
Allowance for loan losses	(2,758)	(3,081)
PCI - Other [Member] \| Other [Member]
Consumer:
Total consumer loans	70	74
PCI - Other [Member] \| Residential 1-4 family [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	4,026	4,005
PCI - Other [Member] \| Commercial [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	27,951	30,917
PCI - Other [Member] \| Home equity lines of credit [Member]
Consumer:
Total consumer loans	3,500	3,543
PCI - Other [Member] \| Home equity loans [Member]
Consumer:
Total consumer loans	629	645
PCI - Other [Member] \| Residential [Member]
Construction:
Total construction	$ 736	$ 675