TriCo Bancshares (TCBK) 10-K 10 Mar 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 26, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	TCBK
Entity Registrant Name	TRICO BANCSHARES /
Entity Central Index Key	356,171
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		22,785,173
Entity Public Float			$ 455,364,095

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Cash and due from banks	$ 94,305	$ 93,150
Cash at Federal Reserve and other banks	209,156	517,578
Cash and cash equivalents	303,461	610,728
Investment securities:
Available for sale	404,885	83,205
Held to maturity	726,530	676,426
Restricted equity securities	16,956	16,956
Loans held for sale	1,873	3,579
Loans	2,522,937	2,282,524
Allowance for loan losses	(36,011)	(36,585)
Total loans, net	2,486,926	2,245,939
Foreclosed assets, net	5,369	4,894
Premises and equipment, net	43,811	43,493
Cash value of life insurance	94,560	92,337
Accrued interest receivable	10,786	9,275
Goodwill	63,462	63,462
Other intangible assets, net	5,894	7,051
Mortgage servicing rights	7,618	7,378
Other assets	48,591	51,735
Total assets	4,220,722	3,916,458
Deposits:
Noninterest-bearing demand	1,155,695	1,083,900
Interest-bearing	2,475,571	2,296,523
Total deposits	3,631,266	3,380,423
Accrued interest payable	774	978
Reserve for unfunded commitments	2,475	2,145
Other liabilities	65,293	49,192
Other borrowings	12,328	9,276
Junior subordinated debt	56,470	56,272
Total liabilities	$ 3,768,606	$ 3,498,286
Commitments and contingencies (Note 18)
Shareholders' equity:
Common stock, no par value: 50,000,000 shares authorized; issued and outstanding: 22,775,173 at December 31, 2015 22,714,964 at December 31, 2014	$ 247,587	$ 244,318
Retained earnings	206,307	176,057
Accumulated other comprehensive income, net of tax	(1,778)	(2,203)
Total shareholders' equity	452,116	418,172
Total liabilities and shareholders' equity	$ 4,220,722	$ 3,916,458

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014	Aug. 21, 2007
Statement of Financial Position [Abstract]
Common stock, no par value
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	22,775,173	22,714,964
Common stock, shares outstanding	22,775,173	22,714,964	15,814,662

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest and dividend income:
Loans, including fees	$ 131,836	$ 103,887	$ 97,548
Debt securities:
Taxable	25,303	14,753	6,349
Tax exempt	1,509	505	583
Dividends	2,118	837	387
Interest bearing cash at Federal Reserve and other banks	648	1,133	1,693
Total interest and dividend income	161,414	121,115	106,560
Interest expense:
Deposits	3,434	3,274	3,445
Other borrowings	4	4	4
Junior subordinated debt	1,978	1,403	1,247
Total interest expense	5,416	4,681	4,696
Net interest income	155,998	116,434	101,864
Benefit from reversal of previously provided loan losses	(2,210)	(4,045)	(715)
Net interest income after provision for loan losses	158,208	120,479	102,579
Noninterest income:
Service charges and fees	31,821	24,236	25,257
Gain on sale of loans	3,064	2,032	5,602
Commissions on sale of non-deposit investment products	3,349	2,995	2,983
Increase in cash value of life insurance	2,786	1,953	1,727
Other	4,327	3,300	1,260
Total noninterest income	45,347	34,516	36,829
Noninterest expense:
Salaries and related benefits	71,405	57,544	51,936
Other	59,436	52,835	41,668
Total noninterest expense	130,841	110,379	93,604
Income before income taxes	72,714	44,616	45,804
Provision for income taxes	28,896	18,508	18,405
Net income	$ 43,818	$ 26,108	$ 27,399
Earnings per share:
Basic	$ 1.93	$ 1.47	$ 1.71
Diluted	$ 1.91	$ 1.46	$ 1.69

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 11,422	$ 12,694	$ 11,366	$ 8,336	$ 5,650	$ 8,234	$ 4,859	$ 7,365	$ 43,818	$ 26,108	$ 27,399
Other comprehensive (loss) income, net of tax:
Unrealized holding losses on securities arising during the period									(1,098)	(94)	(2,452)
Change in minimum pension liability									1,246	(4,114)	1,750
Change in joint beneficiary agreement liability									277	148	400
Other comprehensive (loss) income									425	(4,060)	(302)
Comprehensive income									$ 44,243	$ 22,048	$ 27,097

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning balance at Dec. 31, 2012	$ 229,359	$ 85,561	$ 141,639	$ 2,159
Beginning balance, shares at Dec. 31, 2012		16,000,838
Net income	27,399		27,399
Other comprehensive income (loss)	(302)			(302)
Stock option vesting	1,151	$ 1,151
Stock options forfeited	(22)	(22)
Stock options exercised	3,240	$ 3,240
Stock options exercised, shares		248,765
Tax benefit of stock options exercised	356	$ 356
Repurchase of common stock	(3,490)	$ (930)	(2,560)
Repurchase of common stock, shares		(172,941)
Dividends paid	(6,745)		(6,745)
Ending balance at Dec. 31, 2013	250,946	$ 89,356	159,733	1,857
Ending balance, shares at Dec. 31, 2013		16,076,662
Net income	26,108		26,108
Other comprehensive income (loss)	(4,060)			(4,060)
PSU vesting	42	$ 42
RSU vesting	126	126
Stock option vesting	965	965
Stock options exercised	2,875	$ 2,875
Stock options exercised, shares		166,020
Tax benefit of stock options exercised	225	$ 225
Issuance of common stock, value	151,303	$ 151,303
Issuance of common stock, shares		6,575,550
Repurchase of common stock	(2,551)	$ (574)	(1,977)
Repurchase of common stock, shares		(103,268)
Dividends paid	(7,807)		(7,807)
Ending balance at Dec. 31, 2014	$ 418,172	$ 244,318	176,057	(2,203)
Ending balance, shares at Dec. 31, 2014	22,714,964	22,714,964
Net income	$ 43,818		43,818
Other comprehensive income (loss)	425			425
PSU vesting	179	$ 179
RSU vesting	457	$ 457
RSUs released		12,064,000
Tax benefit from release of RSUs	15	$ 15
Stock option vesting	734	734
Stock options exercised	$ 3,116	$ 3,116
Stock options exercised, shares	154,000	154,500
Tax benefit of stock options exercised	$ 13	$ 13
Reversal of tax benefit from exercise of stock options	(96)	(96)
Repurchase of common stock	(2,868)	$ (1,149)	(1,719)
Repurchase of common stock, shares		(106,355)
Dividends paid	(11,849)		(11,849)
Ending balance at Dec. 31, 2015	$ 452,116	$ 247,587	$ 206,307	$ (1,778)
Ending balance, shares at Dec. 31, 2015	22,775,173	22,775,173

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends paid, per share	$ 0.52	$ 0.44	$ 0.42
Retained Earnings [Member]
Dividends paid, per share	$ 0.52	$ 0.44	$ 0.42

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities:
Net income	$ 43,818	$ 26,108	$ 27,399
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	5,906	5,735	4,623
Amortization of intangible assets	1,157	446	209
(Benefit from) provision for loan losses	(2,210)	(4,045)	(715)
Amortization of investment securities premium, net	3,458	970	752
Originations of loans for resale	(111,640)	(49,241)	(123,834)
Proceeds from sale of loans originated for resale	115,469	49,394	137,859
Gain on sale of loans	(3,064)	(2,032)	(5,602)
Change in market value of mortgage servicing rights	701	1,301	(253)
Provision for losses on foreclosed assets	502	208	682
Gain on sale of foreclosed assets	(991)	(2,153)	(1,640)
Loss (gain) on disposal of fixed assets	129	(49)	39
Increase in cash value of life insurance	(2,786)	(1,953)	(1,727)
Gain on life insurance death benefit	(155)
Equity compensation vesting expense	1,370	1,133	1,151
Equity compensation tax effect	68	(225)	(356)
Deferred income tax expense (benefit)	681	(993)	2,526
Change in:
Reserve for unfunded commitments	330	(395)	(1,200)
Interest receivable	(1,511)	(619)	120
Interest payable	(204)	(67)	(98)
Other assets and liabilities, net	3,789	3,894	1,151
Net cash from operating activities	54,817	27,417	41,086
Investing activities:
Proceeds from maturities of securities available for sale	33,552	24,016	53,468
Proceeds from sale of securities available for sale	2	14,130
Purchases of securities available for sale	(341,303)
Proceeds from maturities of securities held to maturity	93,784	34,172	4,391
Purchases of securities held to maturity	(146,100)	(280,692)	(244,967)
(Purchase) redemption of restricted equity securities, net		(2,415)	484
Loan origination and principal collections, net	(244,018)	(82,079)	(59,411)
Loans purchased		(32,017)	(62,698)
Proceeds from sale of premises and equipment	8	121	12
Improvement of foreclosed assets	(195)	(462)	(479)
Proceeds from sale of other real estate owned	5,449	9,762	13,910
Purchases of premises and equipment	(5,489)	(4,665)	(8,313)
Life insurance proceeds			706
Cash received from acquisition, net		141,405
Net cash (used) provided by investing activities	(604,310)	(178,724)	(302,897)
Financing activities:
Net increase in deposits	250,843	167,984	120,781
Net change in other borrowings	3,052	2,941	(2,862)
Equity compensation tax effect	(68)	225	356
Repurchase of common stock	(412)	(292)	(501)
Dividends paid	(11,849)	(7,807)	(6,745)
Exercise of stock options	660	616	251
Net cash from financing activities	242,226	163,667	111,280
Net change in cash and cash equivalents	(307,267)	12,360	(150,531)
Cash and cash equivalents and beginning of year	610,728	598,368	748,899
Cash and cash equivalents at end of year	303,461	610,728	598,368
Supplemental disclosure of noncash activities:
Unrealized loss on securities available for sale	(1,895)	(162)	(4,232)
Loans transferred to foreclosed assets	5,240	5,291	11,717
Due to broker	17,072
Market value of shares tendered in-lieu of cash to pay for exercise of options and/or related taxes	2,868	2,551	3,490
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	5,620	4,641	4,794
Cash paid for income taxes	$ 24,315	22,685	$ 17,395
Assets acquired in acquisition		978,682
Liabilities assumed in acquisition		$ 827,372

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1 –Summary of Significant Accounting Policies Description of Business and Basis of Presentation TriCo Bancshares (the “Company”) is a California corporation organized to act as a bank holding company for Tri Counties Bank (the “Bank”). The Company and the Bank are headquartered in Chico, California. The Bank is a California-chartered bank that is engaged in the general commercial banking business in 26 California counties. Tri Counties Bank currently operates from 55 traditional branches and 12 in-store branches. The Company has five capital subsidiary business trusts (collectively, the “Capital Trusts”) that issued trust preferred securities, including two organized by TriCo and three acquired with the acquisition of North Valley Bancorp. See Note 17 – Junior Subordinated Debt. The consolidated financial statements are prepared in accordance with accounting policies generally accepted in the United States of America and general practices in the banking industry. The financial statements include the accounts of the Company. All inter-company accounts and transactions have been eliminated in consolidation. For financial reporting purposes, the Company’s investments in the Capital Trusts of $1,696,000 are accounted for under the equity method and, accordingly, are not consolidated and are included in other assets on the consolidated balance sheet. The subordinated debentures issued and guaranteed by the Company and held by the Capital Trusts are reflected as debt on the Company’s consolidated balance sheet. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, the Company evaluates its estimates, including those related to the adequacy of the allowance for loan losses, investments, intangible assets, income taxes and contingencies. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. As described in Note 2, the Company acquired North Valley Bancorp on October 3, 2014. The acquired assets and assumed liabilities were measured at estimated fair value values under the acquisition method of accounting. The Company made significant estimates and exercised significant judgment in accounting for the acquisition. The Company determined loan fair values based on loan file reviews, loan risk ratings, appraised collateral values, expected cash flows and historical loss factors. Foreclosed assets were primarily valued based on appraised values of the repossessed loan collateral. Land and building were valued based on appraised values. An identifiable intangible was also recorded representing the fair value of the core deposit customer base based on an evaluation of the cost of such deposits relative to alternative funding sources. The fair value of time deposits and borrowings were determined based on the present value of estimated future cash flows using current rates as of the acquisition date. Significant Group Concentration of Credit Risk The Company grants agribusiness, commercial, consumer, and residential loans to customers located throughout the northern San Joaquin Valley, the Sacramento Valley and northern mountain regions of California. The Company has a diversified loan portfolio within the business segments located in this geographical area. The Company currently classifies all its operation into one business segment that it denotes as community banking. Cash and Cash Equivalents For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash on hand, amounts due from banks, and federal funds sold. Net cash flows are reported for loan and deposit transactions and other borrowings. Investment Securities The Company classifies its debt and marketable equity securities into one of three categories: trading, available for sale or held to maturity. Trading securities are bought and held principally for the purpose of selling in the near term. Held to maturity securities are those securities which the Company has the ability and intent to hold until maturity. These securities are carried at cost adjusted for amortization of premium and accretion of discount, computed by the effective interest method over their contractual lives. All other securities not included in trading or held to maturity are classified as available for sale. Available for sale securities are recorded at fair value. Unrealized gains and losses, net of the related tax effect, on available for sale securities are reported as a separate component of other accumulated comprehensive income in shareholders’ equity until realized. Premiums and discounts are amortized or accreted over the life of the related investment security as an adjustment to yield using the effective interest method. Dividend and interest income are recognized when earned. Realized gains and losses are derived from the amortized cost of the security sold. During 2015 and 2014, the Company did not have any securities classified as trading. The Company assesses other-than-temporary impairment (“OTTI”) based on whether it intends to sell a security or if it is likely that the Company would be required to sell the security before recovery of the amortized cost basis of the investment, which may be maturity. For debt securities, if we intend to sell the security or it is more likely than not that we will be required to sell the security before recovering its cost basis, the entire impairment loss would be recognized in earnings as an OTTI. If we do not intend to sell the security and it is not likely that we will be required to sell the security but we do not expect to recover the entire amortized cost basis of the security, only the portion of the impairment loss representing credit losses would be recognized in earnings. The credit loss on a security is measured as the difference between the amortized cost basis and the present value of the cash flows expected to be collected. Projected cash flows are discounted by the original or current effective interest rate depending on the nature of the security being measured for potential OTTI. The remaining impairment related to all other factors, the difference between the present value of the cash flows expected to be collected and fair value, is recognized as a charge to other comprehensive income (“OCI”). Impairment losses related to all other factors are presented as separate categories within OCI. The accretion of the amount recorded in OCI increases the carrying value of the investment and does not affect earnings. If there is an indication of additional credit losses the security is re-evaluated according to the procedures described above. No OTTI losses were recognized during 2015 and 2014. Restricted Equity Securities Restricted equity securities represent the Company’s investment in the stock of the Federal Home Loan Bank of San Francisco (“FHLB”) and are carried at par value, which reasonably approximates its fair value. While technically these are considered equity securities, there is no market for the FHLB stock. Therefore, the shares are considered as restricted investment securities. Management periodically evaluates FHLB stock for other-than-temporary impairment. Management’s determination of whether these investments are impaired is based on its assessment of the ultimate recoverability of cost rather than by recognizing temporary declines in value. The determination of whether a decline affects the ultimate recoverability of cost is influenced by criteria such as (1) the significance of any decline in net assets of the FHLB as compared to the capital stock amount for the FHLB and the length of time this situation has persisted, (2) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance of the FHLB, (3) the impact of legislative and regulatory changes on institutions and, accordingly, the customer base of the FHLB, and (4) the liquidity position of the FHLB. As a member of the FHLB system, the Bank is required to maintain a minimum level of investment in FHLB stock based on specific percentages of its outstanding mortgages, total assets, or FHLB advances. The Bank may request redemption at par value of any stock in excess of the minimum required investment. Stock redemptions are at the discretion of the FHLB. Loans Held for Sale Loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by aggregate outstanding commitments from investors of current investor yield requirements. Net unrealized losses are recognized through a valuation allowance by charges to noninterest income. Mortgage loans held for sale are generally sold with the mortgage servicing rights retained by the Company. Gains or losses on the sale of loans that are held for sale are recognized at the time of the sale and determined by the difference between net sale proceeds and the net book value of the loans less the estimated fair value of any retained mortgage servicing rights. Loans and Allowance for Loan Losses Loans originated by the Company, i.e., not purchased or acquired in a business combination, are referred to as originated loans. Originated loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal amount outstanding, net of deferred loan fees and costs. Loan origination and commitment fees and certain direct loan origination costs are deferred, and the net amount is amortized as an adjustment of the related loan’s yield over the actual life of the loan. Originated loans on which the accrual of interest has been discontinued are designated as nonaccrual loans. Originated loans are placed in nonaccrual status when reasonable doubt exists as to the full, timely collection of interest or principal, or a loan becomes contractually past due by 90 days or more with respect to interest or principal and is not well secured and in the process of collection. When an originated loan is placed on nonaccrual status, all interest previously accrued but not collected is reversed. Income on such loans is then recognized only to the extent that cash is received and where the future collection of principal is probable. Interest accruals are resumed on such loans only when they are brought fully current with respect to interest and principal and when, in the judgment of Management, the loan is estimated to be fully collectible as to both principal and interest. An allowance for loan losses for originated loans is established through a provision for loan losses charged to expense. The allowance is maintained at a level which, in Management’s judgment, is adequate to absorb probable incurred credit losses inherent in the loan portfolio as of the balance sheet date. Originated loans and deposit related overdrafts are charged against the allowance for loan losses when Management believes that the collectability of the principal is unlikely or, with respect to consumer installment loans, according to an established delinquency schedule. The allowance is an amount that Management believes will be adequate to absorb probable incurred losses inherent in existing loans, based on evaluations of the collectability, impairment and prior loss experience of loans. The evaluations take into consideration such factors as changes in the nature and size of the portfolio, overall portfolio quality, loan concentrations, specific problem loans, and current economic conditions that may affect the borrower’s ability to pay. The Company defines an originated loan as impaired when it is probable the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Impaired originated loans are measured based on the present value of expected future cash flows discounted at the loan’s original effective interest rate. As a practical expedient, impairment may be measured based on the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. When the measure of the impaired loan is less than the recorded investment in the loan, the impairment is recorded through a valuation allowance. In situations related to originated loans where, for economic or legal reasons related to a borrower’s financial difficulties, the Company grants a concession for other than an insignificant period of time to the borrower that the Company would not otherwise consider, the related loan is classified as a troubled debt restructuring (TDR). The Company strives to identify borrowers in financial difficulty early and work with them to modify to more affordable terms before their loan reaches nonaccrual status. These modified terms may include rate reductions, principal forgiveness, payment forbearance and other actions intended to minimize the economic loss and to avoid foreclosure or repossession of the collateral. In cases where the Company grants the borrower new terms that result in the loan being classified as a TDR, the Company measures any impairment on the restructuring as noted above for impaired loans. TDR loans are classified as impaired until they are fully paid off or charged off. Loans that are in nonaccrual status at the time they become TDR loans, remain in nonaccrual status until the borrower demonstrates a sustained period of performance which the Company generally believes to be six consecutive months of payments, or equivalent. Otherwise, TDR loans are subject to the same nonaccrual and charge-off policies as noted above with respect to their restructured principal balance. Credit risk is inherent in the business of lending. As a result, the Company maintains an allowance for loan losses to absorb probable incurred losses inherent in the Company’s originated loan portfolio. This is maintained through periodic charges to earnings. These charges are included in the Consolidated Statements of Income as provision for loan losses. All specifically identifiable and quantifiable losses are immediately charged off against the allowance. However, for a variety of reasons, not all losses are immediately known to the Company and, of those that are known, the full extent of the loss may not be quantifiable at that point in time. The balance of the Company’s allowance for originated loan losses is meant to be an estimate of these probable incurred losses inherent in the portfolio. The Company formally assesses the adequacy of the allowance for originated loan losses on a quarterly basis. Determination of the adequacy is based on ongoing assessments of the probable risk in the outstanding originated loan portfolio, and to a lesser extent the Company’s originated loan commitments. These assessments include the periodic re-grading of credits based on changes in their individual credit characteristics including delinquency, seasoning, recent financial performance of the borrower, economic factors, changes in the interest rate environment, growth of the portfolio as a whole or by segment, and other factors as warranted. Loans are initially graded when originated. They are re-graded as they are renewed, when there is a new loan to the same borrower, when identified facts demonstrate heightened risk of nonpayment, or if they become delinquent. Re-grading of larger problem loans occurs at least quarterly. Confirmation of the quality of the grading process is obtained by independent credit reviews conducted by consultants specifically hired for this purpose and by various bank regulatory agencies. The Company’s method for assessing the appropriateness of the allowance for originated loan losses includes specific allowances for impaired originated loans, formula allowance factors for pools of credits, and allowances for changing environmental factors (e.g., interest rates, growth, economic conditions, etc.). Allowance factors for loan pools were based on historical loss experience by product type and prior risk rating. During the three months ended March 31, 2014, the Company modified its methodology used to determine the allowance for changing environmental factors by adding a new environmental factor based on the California Home Affordability Index (“CHAI”). The CHAI measures the percentage of households in California that can afford to purchase the median priced home in California based on current home prices and mortgage interest rates. The use of the CHAI environmental factor consists of comparing the current CHAI to its historical baseline, and allows management to consider the adverse impact that a lower than historical CHAI may have on general economic activity and the performance of our borrowers. Based on an analysis of historical data, management believes this environmental factor gives a better estimate of current economic activity compared to other environmental factors that may lag current economic activity to some extent. This change in methodology resulted in no change to the allowance for loan losses as of March 31, 2014 compared to what it would have been without this change in methodology. During the three months ended June 30, 2014, the Company refined the method it uses to evaluate historical losses for the purpose of estimating the pool allowance for unimpaired loans. In the third quarter of 2010, the Company moved from a six point grading system (Grades A-F) to a nine point risk rating system (Risk Ratings 1-9), primarily to allow for more distinction within the “Pass” risk rating. Initially, there was not sufficient loss experience within the nine point scale to complete a migration analysis for all nine risk ratings, all loans risk rated Pass or 2-5 were grouped together, a loss rate was calculated for that group, and that loss rate was established as the loss rate for risk rating 4. The reserve ratios for risk ratings 2, 3 and 5 were then interpolated from that figure. As of June 30, 2014, the Company was able to compile twelve quarters of historical loss information for all risk ratings and use that information to calculate the loss rates for each of the nine risk ratings without interpolation. This refinement led to an increase of $1,438,000 in the reserve requirement for unimpaired loans, driven primarily by home equity lines of credit with a risk rating of 5 or “Pass-Watch.” During the three months ended September 30, 2015, the Company modified its methodology used to determine the allowance for home equity lines of credit that are about to exit their revolving period, or have recently entered into their amortization period and are now classified as home equity loans. This change in methodology increased the required allowance for such lines and loans by $859,000, and $459,000, respectively, and represents the increase in estimated incurred losses in these lines and loans as of September 30, 2015 due to higher required contractual principal and interest payments of such lines and loans. Loans purchased or acquired in a business combination are referred to as acquired loans. Acquired loans are valued as of the acquisition date in accordance with Financial Accounting Standards Board Accounting Standards Codification (“FASB ASC”) Topic 805, Business Combinations Loans and Debt Securities Acquired with Deteriorated Credit Quality Acquired loans that are not PCI loans are referred to as purchased not credit impaired (PNCI) loans. PNCI loans are accounted for under FASB ASC Topic 310-20, Receivables – Nonrefundable Fees and Other Costs, Throughout these financial statements, and in particular in Note 4 and Note 5, when we refer to “Loans” or “Allowance for loan losses” we mean all categories of loans, including Originated, PNCI, PCI – cash basis, and PCI - other. When we are not referring to all categories of loans, we will indicate which we are referring to – Originated, PNCI, PCI – cash basis, or PCI - other. When referring to PNCI and PCI loans we use the terms “nonaccretable difference”, “accretable yield”, or “purchase discount”. Nonaccretable difference is the difference between undiscounted contractual cash flows due and undiscounted cash flows we expect to collect, or put another way, it is the undiscounted contractual cash flows we do not expect to collect. Accretable yield is the difference between undiscounted cash flows we expect to collect and the value at which we have recorded the loan on our financial statements. On the date of acquisition, all purchased loans are recorded on our consolidated financial statements at estimated fair value. Purchase discount is the difference between the estimated fair value of loans on the date of acquisition and the principal amount owed by the borrower, net of charge offs, on the date of acquisition. We may also refer to “discounts to principal balance of loans owed, net of charge-offs”. Discounts to principal balance of loans owed, net of charge-offs is the difference between principal balance of loans owed, net of charge-offs, and loans as recorded on our financial statements. Discounts to principal balance of loans owed, net of charge-offs arise from purchase discounts, and equal the purchase discount on the acquisition date. Loans are also categorized as “covered” or “noncovered”. Covered loans refer to loans covered by a Federal Deposit Insurance Corporation (“FDIC”) loss sharing agreement. Noncovered loans refer to loans not covered by a FDIC loss sharing agreement. Foreclosed Assets Foreclosed assets include assets acquired through, or in lieu of, loan foreclosure. Foreclosed assets are held for sale and are initially recorded at fair value less estimated costs to sell at the date of foreclosure, establishing a new cost basis. Physical possession of residential real estate property collateralizing a consumer mortgage loan occurs when legal title is obtained upon completion of foreclosure or when the borrower conveys all interest in the property to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Any write-downs based on the asset’s fair value less costs to sell at the date of acquisition are charged to the allowance for loan and lease losses. Any recoveries based on the asset’s fair value less estimated costs to sell in excess of the recorded value of the loan at the date of acquisition are recorded to the allowance for loan and lease losses. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed. Revenue and expenses from operations and changes in the valuation allowance are included in other noninterest expense. Gain or loss on sale of foreclosed assets is included in noninterest income. Foreclosed assets that are not subject to a FDIC loss-share agreement are referred to as noncovered foreclosed assets. Foreclosed assets acquired through FDIC-assisted acquisitions that are subject to a FDIC loss-share agreement, and all assets acquired via foreclosure of covered loans are referred to as covered foreclosed assets. Covered foreclosed assets are reported exclusive of expected reimbursement cash flows from the FDIC. Foreclosed covered loan collateral is transferred into covered foreclosed assets at the loan’s carrying value, inclusive of the acquisition date fair value discount. Covered foreclosed assets are initially recorded at estimated fair value less estimated costs to sell on the acquisition date based on similar market comparable valuations less estimated selling costs. Any subsequent valuation adjustments due to declines in fair value will be charged to noninterest expense, and will be mostly offset by noninterest income representing the corresponding increase to the FDIC indemnification asset for the offsetting loss reimbursement amount. Any recoveries of previous valuation adjustments will be credited to noninterest expense with a corresponding charge to noninterest income for the portion of the recovery that is due to the FDIC. Premises and Equipment Land is carried at cost. Land improvements, buildings and equipment, including those acquired under capital lease, are stated at cost less accumulated depreciation and amortization. Depreciation and amortization expenses are computed using the straight-line method over the estimated useful lives of the related assets or lease terms. Asset lives range from 3-10 years for furniture and equipment and 15-40 years for land improvements and buildings. Goodwill and Other Intangible Assets Goodwill represents the excess of costs over fair value of net assets of businesses acquired. Goodwill and other intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but instead tested for impairment at least annually. Intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values, and reviewed for impairment. The Company has an identifiable intangible asset consisting of core deposit intangibles (CDI). CDI are amortized over their respective estimated useful lives, and reviewed for impairment. Impairment of Long-Lived Assets and Goodwill Long-lived assets, such as premises and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposed group classified as held for sale would be presented separately in the appropriate asset and liability sections of the consolidated balance sheet. As of December 31 of each year, goodwill is tested for impairment, and is tested for impairment more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount exceeds the asset’s fair value. This determination is made at the reporting unit level. The Company may choose to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, the Company determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then goodwill is deemed not to be impaired. However, if the Company concludes otherwise, or if the Company elected not to first assess qualitative factors, then the Company performs the first step of a two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. Second, if the carrying amount of the reporting unit exceeds its fair value, an impairment loss is recognized for any excess of the carrying amount of the reporting unit’s goodwill over the implied fair value of that goodwill. The implied fair value of goodwill is determined by allocating the fair value of the reporting unit in a manner similar to a purchase price allocation. The residual fair value after this allocation is the implied fair value of the reporting unit goodwill. Currently, and historically, the Company is comprised of only one reporting unit that operates within the business segment it has identified as “community banking”. Goodwill was not impaired as of December 31, 2015 because the fair value of the reporting unit exceeded its carrying value. Mortgage Servicing Rights Mortgage servicing rights (MSR) represent the Company’s right to a future stream of cash flows based upon the contractual servicing fee associated with servicing mortgage loans. Our MSR arise from residential and commercial mortgage loans that we originate and sell, but retain the right to service the loans. The net gain from the retention of the servicing right is included in gain on sale of loans in noninterest income when the loan is sold. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. Servicing fees are recorded in noninterest income when earned. The Company accounts for MSR at fair value. The determination of fair value of our MSR requires management judgment because they are not actively traded. The determination of fair value for MSR requires valuation processes which combine the use of discounted cash flow models and extensive analysis of current market data to arrive at an estimate of fair value. The cash flow and prepayment assumptions used in our discounted cash flow model are based on empirical data drawn from the historical performance of our MSR, which we believe are consistent with assumptions used by market participants valuing similar MSR, and from data obtained on the performance of similar MSR. The key assumptions used in the valuation of MSR include mortgage prepayment speeds and the discount rate. These variables can, and generally will, change from quarter to quarter as market conditions and projected interest rates change. The key risks inherent with MSR are prepayment speed and changes in interest rates. The Company uses an independent third party to determine fair value of MSR. Indemnification Asset/Liability The Company accounts for amounts receivable or payable under its loss-share agreements entered into with the FDIC in connection with its purchase and assumption of certain assets and liabilities of Granite as indemnification assets in accordance with FASB ASC Topic 805, Business Combinations Reserve for Unfunded Commitments The reserve for unfunded commitments is established through a provision for losses – unfunded commitments charged to noninterest expense. The reserve for unfunded commitments is an amount that Management believes will be adequate to absorb probable losses inherent in existing commitments, including unused portions of revolving lines of credits and other loans, standby letters of credits, and unused deposit account overdraft privilege. The reserve for unfunded commitments is based on evaluations of the collectability, and prior loss experience of unfunded commitments. The evaluations take into consideration such factors as changes in the nature and size of the loan portfolio, overall loan portfolio quality, loan concentrations, specific problem loans and related unfunded commitments, and current economic conditions that may affect the borrower’s or depositor’s ability to pay. Income Taxes The Company’s accounting for income taxes is based on an asset and liability approach. The Company recognizes the amount of taxes payable or refundable for the current year, and deferred tax assets and liabilities for the future tax consequences that have been recognized in its financial statements or tax returns. The measurement of tax assets and liabilities is based on

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Business Combinations	Note 2 - Business Combinations On October 28, 2015, TriCo announced that its subsidiary, Tri Counties Bank, has entered into an agreement to purchase three branches on the North Coast of California from Bank of America, N.A. The branches are located in the cities of Arcata, Eureka, and Fortuna in Humboldt County. TriCo anticipates assuming approximately $235 million in deposits and purchasing approximately $400 thousand in loans and will pay a premium of 1.91% on the deposits assumed. This transaction is expected to occur in March 2016. TriCo completed its acquisition of North Valley Bancorp on October 3, 2014. Based on a fixed exchange ratio of 0.9433 shares of TriCo common stock for each share of North Valley Bancorp common stock, North Valley Bancorp shareholders received an aggregate of 6,575,550 shares of TriCo common stock and $6,823 of cash in-lieu of fractional shares. The 6,575,550 shares of TriCo common stock issued to North Valley Bancorp shareholders represented, on a pro forma basis, approximately 28.9% of the 22,714,964 shares of the combined company outstanding on October 3, 2014. Based on TriCo’s closing stock price of $23.01 on October 3, 2014, North Valley Bancorp shareholders received consideration valued at $151,310,000 or approximately $21.71 per share of North Valley common stock outstanding. The acquisition of North Valley Bancorp expanded the Company’s market presence in Northern California. The customer base and locations of North Valley Bancorp’s branches had significant overlap with the Company’s then existing Northern California customer base and branch locations creating potential cost savings and future growth potential. With the levels of excess capital at the time, the acquisitions fit well into the Company’s growth strategy. North Valley Bancorp was headquartered in Redding California, and was the parent of North Valley Bank, which had approximately $935 million in assets and 22 commercial banking offices in Shasta, Humboldt, Del Norte, Mendocino, Yolo, Sonoma, Placer and Trinity Counties in Northern California at June 30, 2014. In connection with the acquisition, North Valley Bank was merged into Tri Counties Bank on October 3, 2014. On October 25, 2014, North Valley Bank’s electronic customer service and other data processing systems were converted into Tri Counties Bank’s systems. Between January 7, 2015 and January 21, 2015, four Tri Counties Bank branches and four former North Valley Bank branches were consolidated into other Tri Counties Bank or other former North Valley Bank branches. Beginning on October 4, 2014, the effect of revenue and expenses from the operations of North Valley Bancorp, and the issuance of TriCo common shares as consideration in the merger are included in the results of the Company. The assets acquired and liabilities assumed from North Valley Bancorp were accounted for in accordance with ASC 805 “Business Combinations,” using the acquisition method of accounting and were recorded at their estimated fair values on the October 3, 2014 acquisition date, and its results of operations are included in the Company’s consolidated statements of income since that date. The excess of the fair value of consideration transferred over total identifiable net assets was recorded as goodwill. The goodwill arising from the acquisition consists largely of the synergies and economies of scale expected from combining the operations of the Company and North Valley Bancorp. None of the goodwill is deductible for income tax purposes as the acquisition was accounted for as a tax-free exchange. The following table discloses the calculation of the fair value of consideration transferred, the total identifiable net assets acquired and the resulting goodwill relating to the North Valley Bancorp acquisition: (in thousands) North Valley Bancorp Fair value of consideration transferred: Fair value of shares issued $ 151,303 Cash consideration 7 Total fair value of consideration transferred 151,310 Asset acquired: Cash and cash equivalents 141,412 Securities available for sale 17,288 Securities held to maturity 189,950 Restricted equity securities 5,378 Loans 499,327 Foreclosed assets 695 Premises and equipment 11,936 Cash value of life insurance 38,075 Core deposit intangible 6,614 Other assets 20,064 Total assets acquired 930,739 Liabilities assumed: Deposits 801,956 Other liabilities 10,429 Junior subordinated debt 14,987 Total liabilities assumed 827,372 Total net assets acquired 103,367 Goodwill recognized $ 47,943 A summary of the estimated fair value adjustments resulting in the goodwill recorded in the North Valley Bancorp acquisition are presented below: (in thousands) North Valley Bancorp Value of stock consideration paid to North Valley Bancorp Shareholders $ 151,303 Cash payments to North Valley Bancorp Shareholders 7 Cost basis net assets acquired (98,040 ) Fair value adjustments: Loans 5,832 Premises and Equipment (4,785 ) Core deposit intangible (6,283 ) Deferred income taxes 6,293 Junior subordinated debt (6,664 ) Other 280 Goodwill $ 47,943 The Company recorded the loan portfolio of North Valley Bancorp at fair value at the date of acquisition. A valuation of North Valley Bancorp’s loan portfolio was performed as of the acquisition date to assess the fair value of the loan portfolio. The North Valley Bancorp loan portfolio was segmented into two groups; loans with credit deterioration (PCI loans) and loans without credit deterioration (PNCI). For North Valley Bancorp PNCI loans, the present value of estimated future cash flows, based primarily on contractual cash flows, was used to determine fair value. For North Valley Bancorp PCI loans, the present value of estimated future cash flows, based primarily on liquidation value of collateral, was used to determine fair value. The Company grouped the North Valley Bancorp PNCI loans into pools based on similar loan characteristics such as loan type, payment amortization method, and fixed or variable interest rates. A discounted cash flow schedule was prepared for each pool in which the present value of all estimated future cash flows was calculated using a specifically calculated discount rate for each pool. The discount rate used to estimate the fair value of each loan pool was composed of the sum of: an estimated cost of funds rate, an estimated capital charge reflecting the market participant required return on capital, estimated loan servicing costs, and a liquidity premium. All PNCI loan pools included some estimate regarding prepayment rates, and estimated principal default and loss rates, based primarily on North Valley Bancorp’s historical loss experience. The difference between the sum of recorded balances of the North Valley Bancorp PNCI loans in each pool and the present value of each pool represented the total discount (if the recorded value exceeded the present value) or premium (if the present value exceeded the recorded value) for each pool. The total discount, or premium, for each pool was then allocated to the individual loans within each pool based on outstanding loan balance, individual loan risk rating as compared to the weighted average risk rating of the pool, and the contractual payments remaining for the individual loan as compared to the pool. The Company valued the North Valley Bancorp PCI loans at fair value on an individual basis. A discounted cash flow schedule was prepared for each loan in which the present value of all future estimated cash flows was calculated using a specifically calculated discount rate, estimated liquidation value and estimated liquidation timing for each loan. The discount rate used in the calculation of the present value of North Valley Bancorp PCI loans was composed of the sum of: an estimated cost of funds rate, an estimated capital charge reflecting the market participant required return on capital, estimated loan servicing costs, and a liquidity premium. The difference between the recorded balance and the present value of each North Valley Bancorp PCI loan represented the discount for each PCI loan. All North Valley Bancorp PCI loans had recorded values in excess of their present value of estimated future cash flows. The Company identified the North Valley Bancorp PCI loans as having cash flows that were not reasonably estimable and placed these loans in nonaccrual status under ASC 310-30 and included them in the category of loans the Company refers to as “PCI – other” loans. The following table presents the cost basis, fair value discount, and fair value of loans acquired from North Valley Bancorp on October 3, 2014: North Valley Bancorp Acquired Loans (in thousands) Cost Basis Discount Fair Value PNCI $ 502,637 $ (12,721 ) $ 489,916 PCI – other 11,488 (2,077 ) 9,411 Total $ 514,125 $ (14,798 ) $ 499,327 Although the discount on PNCI loans is completely accretable to interest income over the remaining life of such loans, the discount on PCI – other loans from the North Valley Bancorp acquisition are not accretable into interest income until the loan principal balance has been reduced to the loan’s fair value recorded at acquisition. This method of accounting for the PCI – other loans from the North Valley Bancorp acquisition is often referred to as the “cost recovery” method of income recognition. The following table presents a reconciliation of the undiscounted contractual cash flows, nonaccretable difference, accretable yield, fair value, purchase discount, and principal balance of loans for the PNCI and PCI - other categories of North Valley Bancorp loans as of the acquisition date. For North Valley Bancorp PCI – other loans, the purchase discount does not necessarily represent cash flows to be collected: North Valley Bancorp Loans – October 3, 2014 (in thousands) PNCI PCI - other Total Undiscounted contractual cash flows $ 718,731 $ 15,706 $ 734,437 Undiscounted cash flows not expected to be collected (nonaccretable difference) — (6,295 ) (6,295 ) Undiscounted cash flows expected to be collected 718,731 9,411 728,142 Accretable yield at acquisition (228,815 ) — (228,815 ) Estimated fair value of loans acquired at acquisition 489,916 9,411 499,327 Purchase discount 12,721 2,077 14,798 Principal balance loans acquired $ 502,637 $ 11,488 $ 514,125 As part of the acquisition of North Valley Bancorp, the Company performed a valuation of premises and equipment acquired. This valuation resulted in a $4,785,000 increase in the net book value of land and buildings acquired, and was based on current appraisals of such land and buildings. The Company recognized a core deposit intangible of $6,614,000 related to the acquisition of North Valley Bancorp’s core deposits. The recorded core deposit intangibles represented approximately 0.97% of core deposits for North Valley Bancorp and will be amortized over their useful lives of 7 years. A valuation of time deposits for North Valley Bancorp was also performed as of the acquisition date. Time deposits were split into similar pools based on size, type of time deposits, and maturity. A discounted cash flow analysis was performed on the pools based on current market rates currently paid on similar time deposits. The valuation resulted in no material fair value discount or premium, and none was recorded. The fair value of junior subordinated debentures assumed from North Valley Bancorp was estimated using a discounted cash flow method based on the current market rates for similar liabilities. As a result a discount of $6,664,000 was recorded on the junior subordinated debentures acquired from North Valley Bancorp. The discount on the subordinated debentures will be amortized using the effective yield method the remaining life to maturity of the debentures at acquisition which range from 18 years to 21 years.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Note 3 - Investment Securities The amortized cost and estimated fair values of investments in debt and equity securities are summarized in the following tables: December 31, 2015 Amortized Gross Gross Estimated (in thousands) Securities Available for Sale Obligations of U.S. government corporations and agencies $ 312,917 2,761 (1,996 ) $ 313,682 Obligations of states and political subdivisions 86,823 1,428 (33 ) 88,218 Corporate debt securities — — — — Marketable equity securities 3,000 — (15 ) 2,985 Total securities available for sale $ 402,740 $ 4,189 $ (2,044 ) $ 404,885 Securities Held to Maturity Obligations of U.S. government corporations and agencies $ 711,994 8,394 (2,882 ) $ 717,506 Obligations of states and political subdivisions 14,536 277 (110 ) 14,703 Total securities held to maturity $ 726,530 $ 8,671 $ (2,992 ) $ 732,209 December 31, 2014 Amortized Gross Gross Estimated (in thousands) Securities Available for Sale Obligations of U.S. government corporations and agencies $ 71,144 4,001 (25 ) $ 75,120 Obligations of states and political subdivisions 3,130 45 — 3,175 Corporate debt securities 1,891 17 — 1,908 Marketable equity securities 3,000 2 — 3,002 Total securities available for sale $ 79,165 $ 4,065 $ (25 ) $ 83,205 Securities Held to Maturity Obligations of U.S. government corporations and agencies $ 660,836 13,055 (677 ) $ 673,214 Obligations of states and political subdivisions 15,590 130 (155 ) 15,565 Total securities held to maturity $ 676,426 $ 13,185 $ (832 ) $ 688,779 Investment securities totaling $2,000 were sold in 2015 resulting in no gain or loss on sale. Investment securities sold during 2014 totaled $14,130,000 and no investment securities were sold in 2013. Investment securities with an aggregate carrying value of $297,547,000 and $143,992,000 at December 31, 2015 and 2014, respectively, were pledged as collateral for specific borrowings, lines of credit and local agency deposits. The amortized cost and estimated fair value of debt securities at December 31, 2015 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. At December 31, 2015, obligations of U.S. government corporations and agencies with a cost basis totaling $1,024,911,000 consist almost entirely of mortgage-backed securities whose contractual maturity, or principal repayment, will follow the repayment of the underlying mortgages. For purposes of the following table, the entire outstanding balance of these mortgage-backed securities issued by U.S. government corporations and agencies is categorized based on final maturity date. At December 31, 2015, the Company estimates the average remaining life of these mortgage-backed securities issued by U.S. government corporations and agencies to be approximately 5.9 years. Average remaining life is defined as the time span after which the principal balance has been reduced by half. Investment Securities Available for Sale Held to Maturity (In thousands) Amortized Estimated Amortized Estimated Due in one year — — — — Due after one year through five years $ 8,870 $ 9,112 $ 1,147 $ 1,158 Due after five years through ten years 24,150 25,204 830 870 Due after ten years 369,720 370,569 724,553 730,181 Totals $ 402,740 $ 404,885 $ 726,530 $ 732,209 Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) December 31, 2015 Securities Available for Sale: Obligations of U.S. government corporations and agencies $ 193,306 $ (1,996 ) — — $ 193,306 $ (1,996 ) Obligations of states and political subdivisions 6,469 (33 ) — — 6,469 (33 ) Marketable equity securities 2,985 (15 ) — — 2,985 (15 ) Total securities available-for-sale $ 202,760 $ (2,044 ) — — $ 202,760 $ (2,044 ) Securities Held to Maturity: Obligations of U.S. government corporations and agencies $ 198,481 $ (2,882 ) — — $ 198,481 $ (2,882 ) Obligations of states and political subdivisions 497 (11 ) $ 1,121 $ (99 ) 1,618 (110 ) Total securities held-to-maturity $ 198,978 $ (2,893 ) $ 1,121 $ (99 ) $ 200,099 $ (2,992 ) Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) December 31, 2014 Securities Available for Sale: Obligations of U.S. government corporations and agencies $ 6,774 $ (25 ) — — $ 6,774 $ (25 ) Obligations of states and political subdivisions — — — — — — Marketable equity securities — — — — — — Total securities available-for-sale $ 6,774 $ (25 ) — — $ 6,774 $ (25 ) Securities Held to Maturity: Obligations of U.S. government corporations and agencies $ 335 $ (1 ) $ 56,288 $ (676 ) $ 56,623 $ (677 ) Obligations of states and political subdivisions 1,600 (26 ) 1,858 (129 ) 3,458 (155 ) Total securities held-to-maturity $ 1,935 $ (27 ) $ 58,146 $ (805 ) $ 60,081 $ (832 ) Obligations of U.S. government corporations and agencies: Unrealized losses on investments in obligations of U.S. government corporations and agencies are caused by interest rate increases. The contractual cash flows of these securities are guaranteed by U.S. Government Sponsored Entities (principally Fannie Mae and Freddie Mac). It is expected that the securities would not be settled at a price less than the amortized cost of the investment. Because the decline in fair value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell and more likely than not will not be required to sell, these investments are not considered other-than-temporarily impaired. At December 31, 2015, 29 debt securities representing obligations of U.S. government corporations and agencies had unrealized losses with aggregate depreciation of 1.23% from the Company’s amortized cost basis. Obligations of states and political subdivisions: The unrealized losses on investments in obligations of states and political subdivisions were caused by increases in required yields by investors in these types of securities. It is expected that the securities would not be settled at a price less than the amortized cost of the investment. Because the decline in fair value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell and more likely than not will not be required to sell, these investments are not considered other-than-temporarily impaired. At December 31, 2015, 10 debt securities representing obligations of states and political subdivisions had unrealized losses with aggregate depreciation of 1.73% from the Company’s amortized cost basis. Marketable equity securities: At December 31, 2015, marketable equity securities had unrealized losses representing aggregate depreciation of 0.05% from the Company’s amortized cost basis.

Loans

Loans	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Loans	Note 4 – Loans A summary of loan balances follows (in thousands): December 31, 2015 Originated PNCI PCI - PCI - Total Mortgage loans on real estate: Residential 1-4 family $ 207,585 $ 104,535 — $ 2,145 $ 314,265 Commercial 1,163,643 310,864 — 23,060 1,497,567 Total mortgage loan on real estate 1,371,228 415,399 — 25,205 1,811,832 Consumer: Home equity lines of credit 285,419 29,335 4,954 2,784 322,492 Home equity loans 34,717 4,018 124 1,503 40,362 Other 28,998 3,367 — 64 32,429 Total consumer loans 349,134 36,720 5,078 4,351 395,283 Commercial 170,320 19,744 1 4,848 194,913 Construction: Residential 31,778 13,636 — 721 46,135 Commercial 66,285 8,489 — — 74,774 Total construction 98,063 22,125 — 721 120,909 Total loans, net of deferred loan fees and discounts $ 1,988,745 $ 493,988 $ 5,079 $ 35,125 $ 2,522,937 Total principal balance of loans owed, net of charge-offs $ 1,995,296 $ 507,935 $ 12,686 $ 39,693 $ 2,555,610 Unamortized net deferred loan fees (6,551 ) — — — (6,551 ) Discounts to principal balance of loans owed, net of charge-offs — (13,947 ) (7,607 ) (4,568 ) (26,122 ) Total loans, net of unamortized deferred loan fees and discounts $ 1,988,745 $ 493,988 $ 5,079 $ 35,125 $ 2,522,937 Noncovered loans $ 1,988,745 $ 493,988 $ 5,079 $ 29,890 $ 2,517,702 Covered loans — — — 5,235 5,235 Total loans, net of unamortized deferred loan fees and discounts $ 1,988,745 $ 493,988 $ 5,079 $ 35,125 $ 2,522,937 Allowance for loan losses $ (31,271 ) $ (1,848 ) $ (121 ) $ (2,771 ) $ (36,011 ) A summary of loan balances follows (in thousands): December 31, 2014 Originated PNCI PCI - PCI - Total Mortgage loans on real estate: Residential 1-4 family $ 154,594 $ 120,821 — $ 4,005 $ 279,420 Commercial 928,797 376,225 — 30,917 1,335,939 Total mortgage loan on real estate 1,083,391 497,046 — 34,922 1,615,359 Consumer: Home equity lines of credit 305,166 38,397 $ 5,478 3,543 352,584 Home equity loans 23,559 6,985 125 645 31,314 Auto Indirect 112 — — — 112 Other 28,230 4,770 — 74 33,074 Total consumer loans 357,067 50,152 5,603 4,262 417,084 Commercial 126,611 40,899 8 7,427 174,945 Construction: Residential 21,135 16,808 — 675 38,618 Commercial 24,545 11,973 — — 36,518 Total construction 45,680 28,781 — 675 75,136 Total loans, net of deferred loan fees and discounts $ 1,612,749 $ 616,878 $ 5,611 $ 47,286 $ 2,282,524 Total principal balance of loans owed, net of charge-offs $ 1,617,542 $ 634,490 $ 14,805 $ 56,016 $ 2,322,853 Unamortized net deferred loan fees (4,793 ) — — — (4,793 ) Discounts to principal balance of loans owed, net of charge-offs — (17,612 ) (9,194 ) (8,730 ) (35,536 ) Total loans, net of unamortized deferred loan fees and discounts $ 1,612,749 $ 616,878 $ 5,611 $ 47,286 $ 2,282,524 Noncovered loans $ 1,612,749 $ 616,878 $ 5,611 $ 25,018 $ 2,260,256 Covered loans — — — 22,268 22,268 Total loans, net of unamortized deferred loan fees and discounts $ 1,612,749 $ 616,878 $ 5,611 $ 47,286 $ 2,282,524 Allowance for loan losses $ (29,860 ) $ (3,296 ) $ (348 ) $ (3,081 ) $ (36,585 ) The following is a summary of the change in accretable yield for PCI – other loans during the periods indicated (in thousands): Year ended December 31, 2015 2014 Change in accretable yield: Balance at beginning of period $ 14,159 $ 18,233 Accretion to interest income (6,323 ) (5,854 ) Reclassification (to) from nonaccretable difference 5,419 1,780 Balance at end of period $ 13,255 $ 14,159

Allowance for Loan Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Allowance for Loan Losses	Note 5 – Allowance for Loan Losses The following tables summarize the activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated. Allowance for Loan Losses - Year Ended December 31, 2015 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Beginning balance $ 3,086 $ 9,227 $ 15,676 $ 1,797 $ 9 $ 719 $ 4,226 $ 1,434 $ 411 $ 36,585 Charge-offs (224 ) — (694 ) (242 ) (4 ) (972 ) (680 ) — — (2,816 ) Recoveries 204 243 666 252 42 500 677 1,728 140 4,452 (Benefit) provision (559 ) 1,973 (4,395 ) 1,331 (47 ) 441 1,048 (2,263 ) 261 (2,210 ) Ending balance $ 2,507 $ 11,443 $ 11,253 $ 3,138 — $ 688 $ 5,271 $ 899 $ 812 $ 36,011 Ending balance: Individ. evaluated for impairment $ 335 $ 395 $ 605 $ 294 — $ 74 $ 1,187 — — $ 2,890 Loans pooled for evaluation $ 2,112 $ 9,596 $ 10,423 $ 2,844 — $ 614 $ 2,983 $ 844 $ 812 $ 30,228 Loans acquired with deteriorated credit quality $ 60 $ 1,452 $ 225 — — — $ 1,101 $ 55 — $ 2,893 Loans, net of unearned fees – As of December 31, 2015 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Ending balance: Total loans $ 314,265 $ 1,497,567 $ 322,492 $ 40,362 — $ 32,429 $ 194,913 $ 46,135 $ 74,774 $ 2,522,937 Individ. evaluated for impairment $ 6,767 $ 32,407 $ 5,747 $ 1,731 — $ 288 $ 2,671 $ 4 $ 490 $ 50,105 Loans pooled for evaluation $ 305,353 $ 1,442,100 $ 309,007 $ 37,004 — $ 32,077 $ 187,393 $ 45,410 $ 74,284 $ 2,432,628 Loans acquired with deteriorated credit quality $ 2,145 $ 23,060 $ 7,738 $ 1,627 — $ 64 $ 4,849 $ 721 — $ 40,204 Allowance for Loan Losses - Year Ended December 31, 2014 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Beginning balance $ 3,154 $ 9,700 $ 16,375 $ 1,208 $ 66 $ 589 $ 4,331 $ 1,559 $ 1,263 $ 38,245 Charge-offs (171 ) (110 ) (1,094 ) (29 ) (3 ) (599 ) (479 ) (4 ) (69 ) (2,558 ) Recoveries 2 540 960 34 86 495 1,268 1,377 181 4,943 (Benefit) provision 101 (903 ) (565 ) 584 (140 ) 234 (894 ) (1,498 ) (964 ) (4,045 ) Ending balance $ 3,086 $ 9,227 $ 15,676 $ 1,797 $ 9 $ 719 $ 4,226 $ 1,434 $ 411 $ 36,585 Ending balance: Individ. evaluated for impairment $ 974 $ 410 $ 1,974 $ 284 — $ 142 $ 423 $ 60 — $ 4,267 Loans pooled for evaluation $ 1,915 $ 8,408 $ 13,251 $ 1,513 $ 9 $ 572 $ 2,569 $ 332 $ 322 $ 28,891 Loans acquired with deteriorated credit quality $ 197 $ 409 $ 451 — — $ 5 $ 1,234 $ 1,042 $ 89 $ 3,427 Loans, net of unearned fees – As of December 31, 2014 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Ending balance: Total loans $ 279,420 $ 1,335,939 $ 352,584 $ 31,314 $ 112 $ 33,074 $ 174,945 $ 38,618 $ 36,518 $ 2,282,524 Individ. evaluated for impairment $ 7,188 $ 41,932 $ 6,968 $ 1,279 $ 18 $ 323 $ 1,757 $ 2,683 $ 99 $ 62,247 Loans pooled for evaluation $ 268,227 $ 1,263,090 $ 336,595 $ 29,266 $ 94 $ 32,677 $ 165,753 $ 35,260 $ 36,419 $ 2,167,381 Loans acquired with deteriorated credit quality $ 4,005 $ 30,917 $ 9,021 $ 770 — $ 74 $ 7,435 $ 675 — $ 52,897 Allowance for Loan Losses - Year Ended December 31, 2013 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Beginning balance $ 3,523 $ 8,782 $ 21,367 $ 1,155 $ 243 $ 696 $ 4,703 $ 1,400 $ 779 $ 42,648 Charge-offs (46 ) (2,038 ) (2,651 ) (94 ) (68 ) (887 ) (1,599 ) (20 ) (140 ) (7,543 ) Recoveries 345 994 1,053 41 195 759 340 63 65 3,855 (Benefit) provision (668 ) 1,962 (3,394 ) 106 (304 ) 21 887 116 559 (715 ) Ending balance $ 3,154 $ 9,700 $ 16,375 $ 1,208 $ 66 $ 589 $ 4,331 $ 1,559 $ 1,263 $ 38,245 Ending balance: Individ. evaluated for impairment $ 775 $ 1,198 $ 1,140 $ 169 $ 1 $ 8 $ 585 $ 91 $ 8 $ 3,975 Loans pooled for evaluation $ 2,039 $ 7,815 $ 14,749 $ 1,039 $ 65 $ 581 $ 2,402 $ 751 $ 789 $ 30,230 Loans acquired with deteriorated credit quality $ 340 $ 687 $ 486 — — — $ 1,344 $ 717 $ 466 $ 4,040 Loans, net of unearned fees – As of December 31, 2013 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Ending balance: Total loans $ 195,013 $ 912,850 $ 339,866 $ 14,588 $ 946 $ 27,763 $ 131,878 $ 31,933 $ 17,170 $ 1,672,007 Individ. evaluated for impairment $ 7,342 $ 59,936 $ 6,918 $ 778 $ 60 $ 90 $ 3,177 $ 2,756 $ 178 $ 81,235 Loans pooled for evaluation $ 183,015 $ 822,654 $ 322,865 $ 13,324 $ 886 $ 27,592 $ 122,166 $ 27,611 $ 16,947 $ 1,537,060 Loans acquired with deteriorated credit quality $ 4,656 $ 30,260 $ 10,083 $ 486 — $ 81 $ 6,535 $ 1,566 $ 45 $ 53,712 As part of the on-going monitoring of the credit quality of the Company’s loan portfolio, management tracks certain credit quality indicators including, but not limited to, trends relating to (i) the level of criticized and classified loans, (ii) net charge-offs, (iii) non-performing loans, and (iv) delinquency within the portfolio. The Company utilizes a risk grading system to assign a risk grade to each of its loans. Loans are graded on a scale ranging from Pass to Loss. A description of the general characteristics of the risk grades is as follows: • Pass • Special Mention • Substandard • Doubtful • Loss The following tables present ending loan balances by loan category and risk grade for the periods indicated: Credit Quality Indicators – As of December 31, 2015 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Originated loans: Pass $ 199,837 $ 1,118,868 $ 275,251 $ 31,427 — $ 28,339 $ 166,559 $ 31,440 $ 66,285 $ 1,918,006 Special mention 2,018 10,321 2,494 1,027 — 415 1,037 334 — 17,646 Substandard 5,730 34,454 7,674 2,263 — 244 2,724 4 — 53,093 Loss — — — — — — — — — — Total originated $ 207,585 $ 1,163,643 $ 285,419 $ 34,717 — $ 28,998 $ 170,320 $ 31,778 $ 66,285 $ 1,988,745 PNCI loans: Pass $ 102,895 $ 293,935 $ 27,378 $ 3,789 — $ 3,164 $ 19,666 $ 13,636 $ 8,489 $ 472,952 Special mention 600 10,795 445 80 — 74 — — — 11,994 Substandard 1,040 6,134 1,512 149 — 129 78 — — 9,042 Loss — — — — — — — — — — Total PNCI $ 104,535 $ 310,864 $ 29,335 $ 4,018 — $ 3,367 $ 19,744 $ 13,636 $ 8,489 $ 493,988 PCI loans $ 2,145 $ 23,060 $ 7,738 $ 1,627 — $ 64 $ 4,849 $ 721 — $ 40,204 Total loans $ 314,265 $ 1,497,567 $ 322,492 $ 40,362 — $ 32,429 $ 194,913 $ 46,135 $ 74,774 $ 2,522,937 Credit Quality Indicators – As of December 31, 2014 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Originated loans: Pass $ 146,949 $ 883,102 $ 292,244 $ 20,976 $ 66 $ 27,396 $ 124,707 $ 18,112 $ 24,436 $ 1,537,988 Special mention 1,122 11,521 3,590 743 11 591 636 622 — 18,836 Substandard 6,523 34,174 9,332 1,840 35 243 1,268 2,401 109 55,925 Loss — — — — — — — — — — Total originated $ 154,594 $ 928,797 $ 305,166 $ 23,559 $ 112 $ 28,230 $ 126,611 $ 21,135 $ 24,545 $ 1,612,749 PNCI loans: Pass $ 119,643 $ 359,537 $ 36,531 $ 6,813 — $ 4,399 $ 40,628 $ 16,808 $ 11,973 $ 596,332 Special mention 547 12,979 936 147 — 230 268 — — 15,107 Substandard 631 3,709 930 25 — 141 3 — — 5,439 Loss — — — — — — — — — — Total PNCI $ 120,821 $ 376,225 $ 38,397 $ 6,985 — $ 4,770 $ 40,899 $ 16,808 $ 11,973 $ 616,878 PCI loans $ 4,005 $ 30,917 $ 9,021 $ 770 — $ 74 $ 7,435 $ 675 — $ 52,897 Total loans $ 279,420 $ 1,335,939 $ 352,584 $ 31,314 $ 112 $ 33,074 $ 174,945 $ 38,618 $ 36,518 $ 2,282,524 Consumer loans, whether unsecured or secured by real estate, automobiles, or other personal property, are susceptible to three primary risks; non-payment due to income loss, over-extension of credit and, when the borrower is unable to pay, shortfall in collateral value. Typically non-payment is due to loss of job and will follow general economic trends in the marketplace driven primarily by rises in the unemployment rate. Loss of collateral value can be due to market demand shifts, damage to collateral itself or a combination of the two. Problem consumer loans are generally identified by payment history of the borrower (delinquency). The Bank manages its consumer loan portfolios by monitoring delinquency and contacting borrowers to encourage repayment, suggest modifications if appropriate, and, when continued scheduled payments become unrealistic, initiate repossession or foreclosure through appropriate channels. Collateral values may be determined by appraisals obtained through Bank approved, licensed appraisers, qualified independent third parties, public value information (blue book values for autos), sales invoices, or other appropriate means. Appropriate valuations are obtained at initiation of the credit and periodically (every 3-12 months depending on collateral type) once repayment is questionable and the loan has been classified. Commercial real estate loans generally fall into two categories, owner-occupied and non-owner occupied. Loans secured by owner occupied real estate are primarily susceptible to changes in the business conditions of the related business. This may be driven by, among other things, industry changes, geographic business changes, changes in the individual fortunes of the business owner, and general economic conditions and changes in business cycles. These same risks apply to commercial loans whether secured by equipment or other personal property or unsecured. Losses on loans secured by owner occupied real estate, equipment, or other personal property generally are dictated by the value of underlying collateral at the time of default and liquidation of the collateral. When default is driven by issues related specifically to the business owner, collateral values tend to provide better repayment support and may result in little or no loss. Alternatively, when default is driven by more general economic conditions, underlying collateral generally has devalued more and results in larger losses due to default. Loans secured by non-owner occupied real estate are primarily susceptible to risks associated with swings in occupancy or vacancy and related shifts in lease rates, rental rates or room rates. Most often these shifts are a result of changes in general economic or market conditions or overbuilding and resultant over-supply. Losses are dependent on value of underlying collateral at the time of default. Values are generally driven by these same factors and influenced by interest rates and required rates of return as well as changes in occupancy costs. Construction loans, whether owner occupied or non-owner occupied commercial real estate loans or residential development loans, are not only susceptible to the related risks described above but the added risks of construction itself including cost over-runs, mismanagement of the project, or lack of demand or market changes experienced at time of completion. Again, losses are primarily related to underlying collateral value and changes therein as described above. Problem C&I loans are generally identified by periodic review of financial information which may include financial statements, tax returns, rent rolls and payment history of the borrower (delinquency). Based on this information the Bank may decide to take any of several courses of action including demand for repayment, additional collateral or guarantors, and, when repayment becomes unlikely through borrower’s income and cash flow, repossession or foreclosure of the underlying collateral. Collateral values may be determined by appraisals obtained through Bank approved, licensed appraisers, qualified independent third parties, public value information (blue book values for autos), sales invoices, or other appropriate means. Appropriate valuations are obtained at initiation of the credit and periodically (every 3-12 months depending on collateral type) once repayment is questionable and the loan has been classified. Once a loan becomes delinquent and repayment becomes questionable, a Bank collection officer will address collateral shortfalls with the borrower and attempt to obtain additional collateral. If this is not forthcoming and payment in full is unlikely, the Bank will estimate its probable loss, using a recent valuation as appropriate to the underlying collateral less estimated costs of sale, and charge the loan down to the estimated net realizable amount. Depending on the length of time until ultimate collection, the Bank may revalue the underlying collateral and take additional charge-offs as warranted. Revaluations may occur as often as every 3-12 months depending on the underlying collateral and volatility of values. Final charge-offs or recoveries are taken when collateral is liquidated and actual loss is known. Unpaid balances on loans after or during collection and liquidation may also be pursued through lawsuit and attachment of wages or judgment liens on borrower’s other assets. The following table shows the ending balance of current, past due, and nonaccrual originated loans by loan category as of the date indicated: Analysis of Past Due and Nonaccrual Originated Loans – As of December 31, 2015 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Originated loan balance: Past due: 30-59 Days $ 791 $ 200 $ 1,033 $ 402 — $ 12 $ 2,197 — — $ 4,635 60-89 Days — 491 324 341 — 40 — — — 1,196 > 90 Days 271 3,425 520 82 — 19 24 — — 4,341 Total past due $ 1,062 $ 4,116 $ 1,877 $ 825 — $ 71 $ 2,221 — — $ 10,172 Current 206,523 1,159,527 283,542 33,892 — 28,927 168,099 — — 1,978,573 Total orig. loans $ 207,585 $ 1,163,643 $ 285,419 $ 34,717 — $ 28,998 $ 170,320 $ 31,778 $ 66,285 $ 1,988,745 > 90 Days and still accruing — — — — — — — — — — Nonaccrual loans $ 3,045 $ 14,196 $ 3,379 $ 1,195 — $ 21 $ 976 $ 12 — $ 22,824 The following table shows the ending balance of current, past due, and nonaccrual PNCI loans by loan category as of the date indicated: Analysis of Past Due and Nonaccrual PNCI Loans – As of December 31, 2015 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total PNCI loan balance: Past due: 30-59 Days $ 3,106 $ 4,037 $ 92 $ 23 — — $ 1 — — $ 7,259 60-89 Days — — — — — $ 13 — — — 13 > 90 Days 58 748 275 71 — 10 — — $ 490 1,652 Total past due $ 3,164 $ 4,785 $ 367 $ 94 — $ 23 $ 1 — $ 490 $ 8,924 Current 101,371 306,079 28,968 3,924 — 3,344 19,743 $ 13,636 7,999 485,064 Total PNCI loans $ 104,535 $ 310,864 $ 29,335 $ 4,018 — $ 3,367 $ 19,744 $ 13,636 $ 8,489 $ 493,988 > 90 Days and still accruing — — — — — — — — — — Nonaccrual loans $ 348 $ 3,742 $ 676 $ 109 — $ 33 — — $ 490 $ 5,398 The following table shows the ending balance of current, past due, and nonaccrual originated loans by loan category as of the date indicated: Analysis of Past Due and Nonaccrual Originated Loans – As of December 31, 2014 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Originated loan balance: Past due: 30-59 Days $ 1,296 $ 735 $ 2,066 $ 615 $ 4 $ 64 $ 739 — — $ 5,519 60-89 Days 919 — 296 192 — 24 99 — — 1,530 > 90 Days 100 900 754 202 17 46 61 — — 2,080 Total past due $ 2,315 $ 1,635 $ 3,116 $ 1,009 $ 21 $ 134 $ 899 — — $ 9,129 Current 152,279 927,162 302,050 22,550 91 28,096 125,712 21,135 24,545 1,603,620 Total orig. loans $ 154,594 $ 928,797 $ 305,166 $ 23,559 $ 112 $ 28,230 $ 126,611 $ 21,135 $ 24,545 $ 1,612,749 > 90 Days and still accruing — — — — — — — — — — Nonaccrual loans $ 3,430 $ 20,736 $ 4,336 $ 1,197 $ 18 $ 66 $ 246 $ 2,401 $ 99 $ 32,529 The following table shows the ending balance of current, past due, and nonaccrual PNCI loans by loan category as of the date indicated: Analysis of Past Due and Nonaccrual PNCI Loans – As of December 31, 2014 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total PNCI loan balance: Past due: 30-59 Days $ 2,041 $ 260 $ 275 — — $ 25 $ 67 — — $ 2,668 60-89 Days 24 — 118 — — 3 — — — 145 > 90 Days 239 — 73 25 — 76 — — — 413 Total past due $ 2,304 $ 260 $ 466 $ 25 — $ 104 $ 67 — — $ 3,226 Current 118,517 375,965 37,931 6,960 — 4,666 40,832 16,808 11,973 $ 613,652 Total PNCI loans $ 120,821 $ 376,225 $ 38,397 $ 6,985 — $ 4,770 $ 40,899 $ 16,808 $ 11,973 $ 616,878 > 90 Days and still accruing — — — — — — — — — — Nonaccrual loans $ 799 $ 366 $ 346 $ 25 — $ 110 — — — $ 1,646 Impaired originated loans are those where management has concluded that it is probable that the borrower will be unable to pay all amounts due under the contractual terms. The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired Originated and PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated. Impaired Originated Loans – As of December 31, 2015 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 3,886 $ 27,109 $ 2,963 $ 947 — $ 20 $ 576 $ 4 — $ 35,505 Unpaid principal $ 5,998 $ 29,678 $ 6,079 $ 1,349 — $ 35 $ 688 $ 65 — $ 43,892 Average recorded Investment $ 3,586 $ 32,793 $ 2,982 $ 848 — $ 29 $ 494 $ 1,202 $ 50 $ 41,984 Interest income Recognized $ 81 $ 893 $ 23 $ 5 — — $ 29 — — $ 1,031 With an allowance recorded: Recorded investment $ 2,006 $ 1,418 $ 1,724 $ 674 — $ 1 $ 2,094 — — $ 7,917 Unpaid principal $ 2,073 $ 1,453 $ 1,904 $ 701 — $ 1 $ 2,117 — — $ 8,249 Related allowance $ 335 $ 146 $ 525 $ 256 — $ 1 $ 1,187 — — $ 2,450 Average recorded Investment $ 2,365 $ 2,180 $ 2,455 $ 589 — $ 23 $ 1,716 $ 141 — $ 9,469 Interest income Recognized $ 49 $ 74 $ 31 $ 26 — — $ 122 — — $ 302 Impaired PNCI Loans – As of December 31, 2015 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 875 $ 1,132 $ 454 $ 71 — $ 33 $ 1 — $ 490 $ 3,056 Unpaid principal $ 908 $ 1,248 $ 505 $ 73 — $ 52 $ 1 — $ 490 $ 3,277 Average recorded Investment $ 609 $ 749 $ 400 $ 48 — $ 35 $ 4 — $ 245 $ 2,090 Interest income Recognized $ 31 $ 32 $ 3 $ 2 — $ 1 — — $ 18 $ 87 With an allowance recorded: Recorded investment — $ 2,748 $ 606 $ 39 — $ 234 — — — $ 3,627 Unpaid principal — $ 2,858 $ 612 $ 40 — $ 234 — — — $ 3,744 Related allowance — $ 248 $ 80 $ 39 — $ 73 — — — $ 440 Average recorded Investment $ 417 $ 1,447 $ 521 $ 19 — $ 227 — — — $ 2,631 Interest income Recognized — $ 149 $ 14 — — $ 11 — — — $ 174 Impaired Originated Loans – As of December 31, 2014 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 3,287 $ 38,477 $ 3,001 $ 750 $ 14 $ 25 $ 412 $ 2,401 $ 99 $ 48,466 Unpaid principal $ 5,138 $ 41,949 $ 6,094 $ 1,187 $ 49 $ 32 $ 433 $ 6,588 $ 190 $ 61,660 Average recorded Investment $ 3,826 $ 45,915 $ 3,355 $ 651 $ 35 $ 21 $ 1,030 $ 2,437 $ 84 $ 57,354 Interest income Recognized $ 38 $ 995 $ 26 $ 6 — $ 1 $ 26 — $ 3 $ 1,095 With an allowance recorded: Recorded investment $ 2,724 $ 2,943 $ 3,185 $ 504 $ 4 $ 41 $ 1,338 $ 282 — $ 11,021 Unpaid principal $ 2,865 $ 3,101 $ 3,533 $ 597 $ 6 $ 41 $ 1,438 $ 282 — $ 11,863 Related allowance $ 797 $ 302 $ 1,769 $ 284 — $ 11 $ 423 $ 60 — $ 3,646 Average recorded Investment $ 2,677 $ 4,119 $ 2,982 $ 365 $ 4 $ 25 $ 1,428 $ 283 $ 55 $ 11,938 Interest income Recognized $ 91 $ 144 $ 71 $ 13 — — $ 71 $ 19 — $ 409 Impaired PNCI Loans – As of December 31, 2014 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 343 $ 366 $ 346 $ 25 — $ 37 $ 7 — — $ 1,124 Unpaid principal $ 353 $ 2,620 $ 374 $ 25 — $ 54 $ 7 — — $ 3,433 Average recorded Investment $ 246 $ 753 $ 287 $ 12 — $ 36 $ 10 — — $ 1,344 Interest income Recognized $ 14 — $ (1 ) — — — $ 1 — — $ 14 With an allowance recorded: Recorded investment $ 834 $ 146 $ 436 — — $ 220 — — — $ 1,636 Unpaid principal $ 852 $ 146 $ 436 — — $ 220 — — — $ 1,654 Related allowance $ 177 $ 108 $ 205 — — $ 131 — — — $ 621 Average recorded Investment $ 516 $ 148 $ 319 — — $ 124 — — — $ 1,107 Interest income Recognized $ 8 $ 8 $ 20 — — $ 12 — — — $ 48 At December 31, 2015, $29,269,000 of Originated loans were TDRs and classified as impaired. The Company had obligations to lend $35,000 of additional funds on these TDRs as of December 31, 2015. At December 31, 2015, $1,396,000 of PNCI loans were TDRs and classified as impaired. The Company had no obligations to lend additional funds on these TDRs as of December 31, 2015. At December 31, 2014, $45,676,000 of Originated loans were TDRs and classified as impaired. The Company had obligations to lend $54,000 of additional funds on these TDRs as of December 31, 2014. At December 31, 2014, $1,307,000 of PNCI loans were TDRs and classified as impaired. The Company had no obligations to lend additional funds on these TDRs as of December 31, 2014. At December 31, 2013, $56,739,000 of Originated loans were TDRs and classified as impaired. The Company had obligations to lend $25,000 of additional funds on these TDRs as of December 31, 2013. At December 31, 2013, $901,000 of PNCI loans were TDRs and classified as impaired. The Company had no obligations to lend additional funds on these TDRs as of December 31, 2013. The following tables show certain information regarding Troubled Debt Restructurings (TDRs) that occurred during the periods indicated: TDR Information for the Year Ended December 31, 2015 RE Mortgage Home Equity Auto Other Construction (dollars in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Number 4 5 2 2 — 2 8 — — 23 Pre-mod outstanding principal balance $ 800 $ 1,518 $ 301 $ 315 — $ 89 $ 956 — — $ 3,979 Post-mod outstanding principal balance $ 801 $ 1,517 $ 301 $ 321 — $ 89 $ 944 — — $ 3,973 Financial impact due to TDR taken as additional provision $ 8 $ (5 ) — $ 38 — $ 5 $ 405 — — $ 451 Number that defaulted during the period 4 2 3 1 — — — — — 10 Recorded investment of TDRs that defaulted during the period $ 221 $ 280 $ 182 $ 53 — — — — — $ 736 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — $ (9 ) — — — — — $ (9 ) TDR Information for the Year Ended December 31, 2014 RE Mortgage Home Equity Auto Indirect Other Consum. C&I Construction Total (dollars in thousands) Resid. Comm. Lines Loans Resid. Comm. Number 5 7 6 2 — 1 7 1 2 31 Pre-mod outstanding principal balance $ 1,048 $ 1,980 $ 940 $ 100 — $ 147 $ 218 $ 102 $ 219 $ 4,754 Post-mod outstanding principal balance $ 1,050 $ 1,890 $ 967 $ 102 — $ 147 $ 219 $ 85 $ 196 $ 4,656 Financial impact due to TDR taken as additional provision $ 91 $ 22 — $ (1 ) — $ 66 $ 101 — — $ 279 Number that defaulted during the period 2 2 1 — — — 1 — — 6 Recorded investment of TDRs that defaulted during the period $ 344 $ 423 $ 20 — — — $ 116 — — $ 903 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — — — — $ (8 ) — — $ (8 ) Modifications classified as Troubled Debt Restructurings can include one or a combination of the following: rate modifications, term extensions, interest only modifications, either temporary or long-term, payment modifications, and collateral substitutions/additions. For all new Troubled Debt Restructurings, an impairment analysis is conducted. If the loan is determined to be collateral dependent, any additional amount of impairment will be calculated based on the difference between estimated collectible value and the current carrying balance of the loan. This difference could result in an increased provision and is typically charged off. If the asset is determined not to be collateral dependent, the impairment is measured on the net present value difference between the expected cash flows of the restructured loan and the cash flows which would have been received under the original terms. The effect of this could result in a requirement for additional provision to the reserve. The effect of these required provisions for the period are indicated above. Typically if a TDR defaults during the period, the loan is then considered collateral dependent and, if it was not already considered collateral dependent, an appropriate provision will be reserved or charge will be taken. The additional provisions required resulting from default of previously modified TDR’s are noted above.

Foreclosed Assets

Foreclosed Assets	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Foreclosed Assets	Note 6 – Foreclosed Assets A summary of the activity in the balance of foreclosed assets follows (dollars in thousands): Year ended December 31, 2015 Year ended December 31, 2014 Noncovered Covered Total Noncovered Covered Total Beginning balance, net $ 4,449 $ 445 $ 4,894 $ 5,588 $ 674 $ 6,262 Acquisitions — — — 695 — 695 Additions/transfers from loans 5,880 (445 ) 5,435 5,753 — 5,753 Dispositions/sales (4,458 ) — (4,458 ) (7,391 ) (217 ) (7,608 ) Valuation adjustments (502 ) — (502 ) (196 ) (12 ) (208 ) Ending balance, net $ 5,369 — $ 5,369 $ 4,449 $ 445 $ 4,894 Ending valuation allowance $ (572 ) — $ (572 ) $ (208 ) — $ (208 ) Ending number of foreclosed assets 26 — 26 28 1 29 Proceeds from sale of foreclosed assets $ 5,449 — $ 5,449 $ 9,517 $ 245 $ 9,762 Gain on sale of foreclosed assets $ 991 — $ 991 $ 2,125 $ 28 $ 2,153 At December 31, 2015, the balance of real estate owned includes $1,787,000 of foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property. At December 31, 2015, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are underway is $658,000.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Premises and Equipment	Note 7 – Premises and Equipment Premises and equipment were comprised of: December 31, December 31, (In thousands) Land & land improvements $ 8,909 $ 8,933 Buildings 38,643 39,638 Furniture and equipment 31,081 28,446 78,633 77,017 Less: Accumulated depreciation (35,518 ) (33,570 ) 43,115 43,447 Construction in progress 696 46 Total premises and equipment $ 43,811 $ 43,493 Depreciation expense for premises and equipment amounted to $5,043,000, $4,648,000, and $3,635,000 in 2015, 2014, and 2013, respectively.

Cash Value of Life Insurance

Cash Value of Life Insurance	12 Months Ended
	Dec. 31, 2015
Investments, All Other Investments [Abstract]
Cash Value of Life Insurance	Note 8 – Cash Value of Life Insurance A summary of the activity in the balance of cash value of life insurance follows (dollars in thousands): Year ended December 31, 2015 2014 Beginning balance $ 92,337 $ 52,309 Acquisitions — 38,075 Increase in cash value of life insurance 2,786 1,953 Death benefit receivable in excess of cash value 155 — Death benefit receivable (718 ) — Ending balance $ 94,560 $ 92,337 End of period death benefit $ 166,299 $ 165,966 Number of policies owned 187 189 Insurance companies used 14 14 Current and former employees and directors covered 59 60 As of December 31, 2015, the Bank was the owner and beneficiary of 187 life insurance policies, issued by 14 life insurance companies, covering 59 current and former employees and directors. These life insurance policies are recorded on the Company’s financial statements at their reported cash (surrender) values. As a result of current tax law and the nature of these policies, the Bank records any increase in cash value of these policies as nontaxable noninterest income. If the Bank decided to surrender any of the policies prior to the death of the insured, such surrender may result in a tax expense related to the life-to-date cumulative increase in cash value of the policy. If the Bank retains such policies until the death of the insured, the Bank would receive nontaxable proceeds from the insurance company equal to the death benefit of the policies. The Bank has entered into Joint Beneficiary Agreements (JBAs) with certain of the insured that for certain of the policies provide some level of sharing of the death benefit, less the cash surrender value, among the Bank and the beneficiaries of the insured upon the receipt of death benefits. See Note 15 of these consolidated financial statements for additional information on JBAs.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 9 – Goodwill and Other Intangible Assets The following table summarizes the Company’s goodwill intangible as of the dates indicated: December 31, December 31, (Dollar in Thousands) 2015 Additions Reductions 2014 Goodwill $ 63,462 — — $ 63,462 The following table summarizes the Company’s core deposit intangibles as of the dates indicated: (Dollar in Thousands) December 31, Additions Reductions/ Fully December 31, Core deposit intangibles $ 8,074 — — — $ 8,074 Accumulated amortization (2,180 ) $ (1,157 ) — — (1,023 ) Core deposit intangibles, net $ 5,894 $ (1,157 ) — — $ 7,051 The Company recorded additions to CDI of $6,614,000 in conjunction with the North Valley Bancorp acquisition on October 3, 2014, $898,000 in conjunction with the Citizens acquisition on September 23, 2011, and $562,000 in conjunction with the Granite acquisition on May 28, 2010. The following table summarizes the Company’s estimated core deposit intangible amortization (dollars in thousands): Years Ended Estimated Core Deposit 2016 $ 1,157 2017 1,109 2018 1,044 2019 948 2020 948 Thereafter $ 688

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Mortgage Servicing Rights	Note 10 – Mortgage Servicing Rights The following tables summarize the activity in, and the main assumptions we used to determine the fair value of mortgage servicing rights for the periods indicated (dollars in thousands): Years ended December 31, 2015 2014 2013 Balance at beginning of period $ 7,378 $ 6,165 $ 4,552 Acquisition — 1,944 — Originations 941 570 1,360 Change in fair value (701 ) (1,301 ) 253 Balance at end of period $ 7,618 $ 7,378 $ 6,165 Contractually specified servicing fees, late fees and ancillary fees earned $ 2,164 $ 1,869 $ 1,774 Balance of loans serviced at: Beginning of period $ 840,288 $ 680,197 $ 666,512 End of period $ 817,917 $ 840,288 $ 680,197 Weighted-average prepayment speed (CPR) 9.8 % 12.0 % 10.3 % Weighted-average discount rate 10.0 % 10.0 % 10.0 % The changes in fair value of MSRs that occurred during 2015 and 2014 were mainly due to changes in principal balances and changes in estimate life of the MSRs.

Indemnification Asset

Indemnification Asset	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Indemnification Asset	Note 11 – Indemnification Asset A summary of the activity in the balance of indemnification asset (liability) included in other assets is follows (in thousands): Year ended December 31, 2015 2014 2013 Beginning balance $ (349 ) $ 206 $ 1,997 Effect of actual covered losses (recoveries) and increase (decrease) in estimated future covered losses (93 ) (853 ) (1,419 ) Change in estimated “true up” liability (71 ) (100 ) — Reimbursable (revenue) expenses, net 4 85 (159 ) Payments made (received) (12 ) 313 (213 ) Ending balance $ (521 ) $ (349 ) $ 206 Amount of indemnification asset (liability) recorded in other assets $ 77 $ (349 ) $ 206 Amount of indemnification liability recorded in other liabilities (598 ) — — Ending balance $ (521 ) $ (349 ) $ 206

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	Note 12 – Other Assets Other assets were comprised of (in thousands): As of December 31, 2015 2014 Deferred tax asset, net (Note 22) $ 36,440 $ 37,706 Prepaid expense 3,062 3,378 Software 1,290 1,327 Advanced compensation 673 908 Capital Trusts 1,696 1,690 Investment in Low Housing Tax Credit Funds 4,223 — Prepaid Taxes — 5,599 Miscellaneous other assets 1,207 1,127 Total other assets $ 48,591 $ 51,735

Deposits

Deposits	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Deposits	Note 13 – Deposits A summary of the balances of deposits follows (in thousands): December 31, 2015 2014 Noninterest-bearing demand $ 1,155,695 $ 1,083,900 Interest-bearing demand 853,961 782,385 Savings 1,281,540 1,156,126 Time certificates, $250,000 and over 75,897 38,217 Other time certificates 264,173 319,795 Total deposits $ 3,631,266 $ 3,380,423 Certificate of deposit balances of $50,000,000 and $5,000,000 from the State of California were included in time certificates, $250,000 and over, at December 31, 2015 and 2014, respectively. The Bank participates in a deposit program offered by the State of California whereby the State may make deposits at the Bank’s request subject to collateral and credit worthiness constraints. The negotiated rates on these State deposits are generally more favorable than other wholesale funding sources available to the Bank. Overdrawn deposit balances of $796,000 and $1,216,000 were classified as consumer loans at December 31, 2015 and 2014, respectively. At December 31, 2015, the scheduled maturities of time deposits were as follows (in thousands): Scheduled Maturities 2016 $ 285,400 2017 27,754 2018 10,331 2019 5,805 2020 10,777 Thereafter 3 Total $ 340,070

Reserve for Unfunded Commitment

Reserve for Unfunded Commitments	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Reserve for Unfunded Commitments	Note 14 – Reserve for Unfunded Commitments The following tables summarize the activity in reserve for unfunded commitments for the periods indicated (dollars in thousands): Years ended December 31, 2015 2014 2013 Balance at beginning of period $ 2,145 $ 2,415 $ 3,615 Acquisitions — 125 — Provision for losses – Unfunded commitments 330 (395 ) (1,200 ) Balance at end of period $ 2,475 $ 2,145 $ 2,415

Other Liabilities

Other Liabilities	12 Months Ended
	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Other Liabilities	Note 15 – Other Liabilities Other liabilities were comprised of (in thousands): December 31, 2015 2014 Deferred compensation $ 6,725 $ 7,408 Pension liability 26,182 26,798 Joint beneficiary agreements 2,529 2,728 Low income housing tax credit fund commitments 3,330 — Accrued salaries and benefits expense 3,851 5,407 Loan escrow and servicing payable 2,037 1,938 Deferred revenue 1,082 1,091 Unsettled investment security purchases 17,072 — Miscellaneous other liabilities 2,485 3,822 Total other liabilities $ 65,293 $ 49,192

Other Borrowings

Other Borrowings	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Other Borrowings	Note 16 – Other Borrowings A summary of the balances of other borrowings follows: December 31, 2015 2014 (in thousands) Other collateralized borrowings, fixed rate, as of December 31, 2015 of 0.05%, payable on January 4, 2016 $ 12,328 $ 9,276 Total other borrowings $ 12,328 $ 9,276 The Company did not enter into any other borrowings or repurchase agreements during 2015 or 2014. The Company had $12,328,000 and $9,276,000 of other collateralized borrowings at December 31, 2015 and 2014, respectively. Other collateralized borrowings are generally overnight maturity borrowings from non-financial institutions that are collateralized by securities owned by the Company. As of December 31, 2015, the Company has pledged as collateral and sold under agreements to repurchase investment securities with fair value of $12,328,000 under these other collateralized borrowings. The Company maintains a collateralized line of credit with the Federal Home Loan Bank of San Francisco. Based on the FHLB stock requirements at December 31, 2015, this line provided for maximum borrowings of $1,143,065,000 of which none was outstanding, leaving $1,143,065,000 available. As of December 31, 2015, the Company had designated investment securities with a fair value of $94,351,000 and loans totaling $1,673,789,000 as potential collateral under this collateralized line of credit with the FHLB. The Company maintains a collateralized line of credit with the Federal Reserve Bank of San Francisco. As of December 31, 2015, this line provided for maximum borrowings of $135,684,000 of which none was outstanding, leaving $135,684,000 available. As of December 31, 2015, the Company has designated investment securities with fair value of $218,000 and loans totaling $186,187,000 as potential collateral under this collateralized line of credit with the FRB. The Company has available unused correspondent banking lines of credit from commercial banks totaling $15,000,000 for federal funds transactions at December 31, 2015.

Junior Subordinated Debt

Junior Subordinated Debt	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Junior Subordinated Debt	Note 17 – Junior Subordinated Debt On July 31, 2003, the Company formed a subsidiary business trust, TriCo Capital Trust I, to issue trust preferred securities. Concurrently with the issuance of the trust preferred securities, the trust issued 619 shares of common stock to the Company for $1,000 per share or an aggregate of $619,000. In addition, the Company issued a junior subordinated debenture to the trust in the amount of $20,619,000. The terms of the junior subordinated debenture are materially consistent with the terms of the trust preferred securities issued by TriCo Capital Trust I. Also on July 31, 2003, TriCo Capital Trust I completed an offering of 20,000 shares of cumulative trust preferred securities for cash in an aggregate amount of $20,000,000. The trust preferred securities are mandatorily redeemable upon maturity on October 7, 2033 with an interest rate that resets quarterly at three-month LIBOR plus 3.05%. TriCo Capital Trust I has the right to redeem the trust preferred securities on or after October 7, 2008. The trust preferred securities were issued through an underwriting syndicate to which the Company paid underwriting fees of $7.50 per trust preferred security or an aggregate of $150,000. The net proceeds of $19,850,000 were used to finance the opening of new branches, improve bank services and technology, repurchase shares of the Company’s common stock under its repurchase plan and increase the Company’s capital. On June 22, 2004, the Company formed a second subsidiary business trust, TriCo Capital Trust II, to issue trust preferred securities. Concurrently with the issuance of the trust preferred securities, the trust issued 619 shares of common stock to the Company for $1,000 per share or an aggregate of $619,000. In addition, the Company issued a junior subordinated debenture to the trust in the amount of $20,619,000. The terms of the junior subordinated debenture are materially consistent with the terms of the trust preferred securities issued by TriCo Capital Trust II. Also on June 22, 2004, TriCo Capital Trust II completed an offering of 20,000 shares of cumulative trust preferred securities for cash in an aggregate amount of $20,000,000. The trust preferred securities are mandatorily redeemable upon maturity on July 23, 2034 with an interest rate that resets quarterly at three-month LIBOR plus 2.55%. TriCo Capital Trust II has the right to redeem the trust preferred securities on or after July 23, 2009. The trust preferred securities were issued through an underwriting syndicate to which the Company paid underwriting fees of $2.50 per trust preferred security or an aggregate of $50,000. The net proceeds of $19,950,000 were used to finance the opening of new branches, improve bank services and technology, repurchase shares of the Company’s common stock under its repurchase plan and increase the Company’s capital. As a result of the Company’s acquisition of North Valley Bancorp on October 3, 2014, the Company assumed the junior subordinated debentures issued by North Valley Bancorp to North Valley Capital Trusts II, III & IV with face amounts of $6,186,000, $5,155,000 and $10,310,000, respectively. Also, as a result of the North Valley Bancorp acquisition, the Company acquired common stock interests in North Valley Capital Trusts II, III and IV with face valley of $186,000, $155,000, and $310,000, respectively. At the acquisition date of October 3, 2014, the junior subordinated debentures associated with North Valley Capital Trust II, III and IV were recorded on the Company’s books at their fair values of $5,006,000, $3,918,000, and $6,063,000, respectively. The related fair value discounts to face value of these debentures will be amortized over the remaining time to maturity for each of these debentures using the effective interest method. Similar, and proportional, discounts were applied to the acquired common stock interest in North Valley Capital Trusts II, III and IV, and these discounts will be proportionally amortized over the remaining time to maturity for each related debenture. TriCo Capital Trusts I and II, and North Valley Capital Trusts II, III and IV are collectively referred to as the Capital Trusts. The recorded book values of the junior subordinated debentures issued by the Capital Trusts are reflected as junior subordinated debt in the Company’s consolidated balance sheets. The common stock issued by the Capital Trusts and owned by the Company is recorded in other assets in the Company’s consolidated balance sheets. The recorded book value of the debentures issued by the Capital Trusts, less the recorded book value of the common stock of the Capital Trusts owned by the Company, continues to qualify as Tier 1 or Tier 2 capital under interim guidance issued by the Board of Governors of the Federal Reserve System. The following table summarizes the terms and recorded balance of each subordinated debenture as of the date indicated (dollars in thousands): Subordinated Debt Series Maturity Face Coupon As of December 31, Current Recorded TriCo Cap Trust I 10/7/2033 $ 20,619 3.05 % 3.37 % $ 20,619 TriCo Cap Trust II 7/23/2034 20,619 2.55 % 2.87 % 20,619 North Valley Trust II 4/24/2033 6,186 3.25 % 3.58 % 5,055 North Valley Trust III 4/24/2034 5,155 2.80 % 3.12 % 3,966 North Valley Trust IV 3/15/2036 10,310 1.33 % 1.84 % 6,211 $ 62,889 $ 56,470

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 18 - Commitments and Contingencies Restricted Cash Balances Lease Commitments Operating Leases (in thousands) 2016 $ 3,067 2017 2,400 2018 1,755 2019 1,211 2020 2,382 Thereafter 659 Future minimum lease payments $ 11,474 Rent expense under operating leases was $6,241,000 in 2015, $4,786,000 in 2014, and $4,300,000 in 2013. Rent expense was offset by rent income of $217,000 in 2015, $225,000 in 2014, and $216,000 in 2013. Financial Instruments with Off-Balance-Sheet Risk The Company’s exposure to loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit written is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. The Company’s exposure to loss in the event of nonperformance by the other party to the financial instrument for deposit account overdraft privilege is represented by the overdraft privilege amount disclosed to the deposit account holder. The following table presents a summary of the Bank’s commitments and contingent liabilities: (in thousands) December 31, December 31, Financial instruments whose amounts represent risk: Commitments to extend credit: Commercial loans $ 196,399 $ 177,557 Consumer loans 394,278 392,705 Real estate mortgage loans 42,793 36,139 Real estate construction loans 71,846 49,774 Standby letters of credit 8,330 17,531 Deposit account overdraft privilege 94,473 101,060 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates of one year or less or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on Management’s credit evaluation of the customer. Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, residential properties, and income-producing commercial properties. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support private borrowing arrangements. Most standby letters of credit are issued for one year or less. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. Collateral requirements vary, but in general follow the requirements for other loan facilities. Deposit account overdraft privilege amount represents the unused overdraft privilege balance available to the Company’s deposit account holders who have deposit accounts covered by an overdraft privilege. The Company has established an overdraft privilege for certain of its deposit account products whereby all holders of such accounts who bring their accounts to a positive balance at least once every thirty days receive the overdraft privilege. The overdraft privilege allows depositors to overdraft their deposit account up to a predetermined level. The predetermined overdraft limit is set by the Company based on account type. Legal Proceedings On January 24, 2014, a putative shareholder class action lawsuit was filed against TriCo, North Valley Bancorp and certain other defendants in connection with TriCo entering into the merger agreement with North Valley Bancorp. The lawsuit, which was filed in the Shasta County, California Superior Court, alleges that the members of the North Valley Bancorp board of directors breached their fiduciary duties to North Valley Bancorp shareholders by approving the proposed merger for inadequate consideration; approving the transaction in order receive benefits not equally shared by other North Valley Bancorp shareholders; entering into the merger agreement containing preclusive deal protection devices; and failing to take steps to maximize the value to be paid to the North Valley Bancorp shareholders. The lawsuit alleges claims against TriCo for aiding and abetting these alleged breaches of fiduciary duties. The plaintiff seeks, among other things, declaratory and injunctive relief concerning the alleged breaches of fiduciary duties injunctive relief prohibiting consummation of the merger, rescission, attorneys’ of the merger agreement, fees and costs, and other and further relief. On July 31, 2014 the defendants entered into a memorandum of understanding with the plaintiffs regarding the settlement of this lawsuit. In connection with the settlement contemplated by the memorandum of understanding and in consideration for the full settlement and release of all claims, TriCo and North Valley Bancorp agreed to make certain additional disclosures related to the proposed merger, which are contained in a Current Report on Form 8-K filed by each of the companies. The memorandum of understanding contemplated that the parties would negotiate in good faith and use their reasonable best efforts to enter into a stipulation of settlement. The parties entered into a stipulation of settlement dated May 18, 2015 that was subject to customary conditions, including final court approval following notice to North Valley Bancorp’s shareholders. The parties amended the stipulation on October 19, 2015. Following a hearing in Shasta County Superior Court on October 26, 2015, the Court approved and entered a final Stipulated Judgement concluding the case and dismissing all the named individual director defendants. The Court awarded the plaintiff $250,000 in fees. A liability related to this potential settlement was established by North Valley Bancorp prior to its acquisition by TriCo on October 3, 2015, and that liability was recorded by TriCo as part of its purchase accounting of North Valley Bancorp on October 3, 2015. On September 15, 2014, a former Personal Banker at one of the Bank’s in-store branches filed a Class Action Complaint against the Bank in Butte County Superior Court, alleging causes of action related to the observance of meal and rest periods and seeking to represent a class of current and former hourly-paid or non-exempt personal bankers, or employees with the same or similar job duties, employed by Defendants within the State of California during the preceding four years. On or about June 25, 2015, Plaintiff filed an Amended Complaint expanding the class definition to all current and formerly hourly-paid or non-exempt branch employees employed by Defendant’s within the State of California at any time during the period from September 15, 2010 to final judgment. The Bank has responded to the First Amended Complaint, denying the charges, and the parties have engaged in written discovery. The parties are in the process of scheduling the matter for mediation in the June – July, 2016 time period. On January 20, 2015, a current Personal Banker at one of the Bank’s in-store branches filed a First Amended Complaint against Tri Counties Bank and TriCo Bancshares, dba Tri Counties Bank, in Sacramento County Superior Court, alleging causes of action related to wage statement violations. Plaintiff seeks to represent a class of current and former exempt and non-exempt employees who worked for the Bank during the time period beginning October 18, 2013 through the date of the filing of this action. The Company and the Bank have responded to the First Amended Complaint, deny the charges, and has engaged in written discovery with Plaintiff. The parties intend to mediate this matter in a joint mediation with the above matter this summer. Neither the Company nor its subsidiaries, are party to any other material pending legal proceeding, nor is their property the subject of any material pending legal proceeding, except routine legal proceedings arising in the ordinary course of their business. None of these proceedings is expected to have a material adverse impact upon the Company’s business, consolidated financial position or results of operations. Other Commitments and Contingencies Mortgage loans sold to investors may be sold with servicing rights retained, with only the standard legal representations and warranties regarding recourse to the Bank. Management believes that any liabilities that may result from such recourse provisions are not significant.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Shareholders' Equity	Note 19 – Shareholders’ Equity Dividends Paid The Bank paid to the Company cash dividends in the aggregate amounts of $13,304,000, $8,270,000, and $8,175,000 in 2015, 2014, and 2013, respectively. The Bank is regulated by the Federal Deposit Insurance Corporation (FDIC) and the State of California Department of Business Oversight. Absent approval from the Commissioner of Department of Business Oversight, California banking laws generally limit the Bank’s ability to pay dividends to the lesser of (1) retained earnings or (2) net income for the last three fiscal years, less cash distributions paid during such period. Under this law, at December 31, 2015, the Bank may pay dividends of $73,297,000. Shareholders’ Rights Plan On June 25, 2001, the Company announced that its Board of Directors adopted and entered into a Shareholder Rights Agreement designed to protect and maximize shareholder value and to assist the Board of Directors in ensuring fair and equitable benefit to all shareholders in the event of a hostile bid to acquire the Company. The Company adopted the Rights Agreement to protect shareholders from coercive or otherwise unfair takeover tactics. In general terms, the Rights Plan would have imposed a significant penalty upon any person or group that acquired 15% or more of the Company’s outstanding common stock without approval of the Company’s Board of Directors. On June 4, 2014, the Company entered into an amendment to its Rights Agreement terminating the Rights Agreement as of that date. At the time of the termination, all Rights distributed to holders of the Company’s common stock pursuant to the Rights Agreement expired. Stock Repurchase Plan On August 21, 2007, the Board of Directors adopted a plan to repurchase, as conditions warrant, up to 500,000 shares of the Company’s common stock on the open market. The timing of purchases and the exact number of shares to be purchased will depend on market conditions. The 500,000 shares authorized for repurchase under this stock repurchase plan represented approximately 3.2% of the Company’s 15,814,662 outstanding common shares as of August 21, 2007. This stock repurchase plan has no expiration date. As of December 31, 2015, the Company had repurchased 166,600 shares under this plan. Stock Repurchased Under Equity Compensation Plans During the years ended December 31, 2015, 2014, and 2013, employees tendered 106,355, 103,268, and 172,941, respectively, of the Company’s common stock with market value of $2,868,000, $2,551,000, and $3,490,000, respectively, in lieu of cash to exercise options to purchase shares of the Company’s stock and to pay income taxes related to such exercises as permitted by the Company’s shareholder-approved equity compensation plans. The tendered shares were retired. The market value of tendered shares is the last market trade price at closing on the day an option is exercised. Stock repurchased under equity incentive plans are not counted in the total of stock repurchased under the stock repurchase plan announced August 21, 2007.

Stock Options and Other Equity-

Stock Options and Other Equity-Based Incentive Instruments	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options and Other Equity-Based Incentive Instruments	Note 20 - Stock Options and Other Equity-Based Incentive Instruments In March 2009, the Company’s Board of Directors adopted the TriCo Bancshares 2009 Equity Incentive Plan (2009 Plan) covering officers, employees, directors of, and consultants to, the Company. The 2009 Plan was approved by the Company’s shareholders in May 2009. The 2009 Plan allows for the granting of the following types of “stock awards” (Awards): incentive stock options, nonstatutory stock options, performance awards, restricted stock, restricted stock unit (RSU) awards and stock appreciation rights. RSUs that vest based solely on the grantee remaining in the service of the Company for a certain amount of time, are referred to as “service condition vesting RSUs”. RSUs that vest based on the grantee remaining in the service of the Company for a certain amount of time and a market condition such as the total return of the Company’s common stock versus the total return of an index of bank stocks, are referred to as “market plus service condition vesting RSUs”. In May 2013, the Company’s shareholders approved an amendment to the 2009 Plan increasing the maximum aggregate number of shares of TriCo’s common stock which may be issued pursuant to or subject to Awards from 650,000 to 1,650,000. The number of shares available for issuance under the 2009 Plan is reduced by: (i) one share for each share of common stock issued pursuant to a stock option or a Stock Appreciation Right and (ii) two shares for each share of common stock issued pursuant to a Performance Award, a Restricted Stock Award or a Restricted Stock Unit Award. When Awards made under the 2009 Plan expire or are forfeited or cancelled, the underlying shares will become available for future Awards under the 2009 Plan. To the extent that a share of common stock pursuant to an Award that counted as two shares against the number of shares again becomes available for issuance under the 2009 Plan, the number of shares of common stock available for issuance under the 2009 Plan shall increase by two shares. Shares awarded and delivered under the 2009 Plan may be authorized but unissued, or reacquired shares. As of December 31, 2015, 670,000 options for the purchase of common shares, and 78,383 restricted stock units were outstanding, and 734,107 shares remain available for issuance, under the 2009 Plan. In May 2001, the Company adopted the TriCo Bancshares 2001 Stock Option Plan (2001 Plan) covering officers, employees, directors of, and consultants to, the Company. Under the 2001 Plan, the option exercise price cannot be less than the fair market value of the Common Stock at the date of grant except in the case of substitute options. Options for the 2001 Plan expire on the tenth anniversary of the grant date. Vesting schedules under the 2001 Plan are determined individually for each grant. As of December 31, 2015, 278,350 options for the purchase of common shares were outstanding under the 2001 Plan. As of May 2009, as a result of the shareholder approval of the 2009 Plan, no new options may be granted under the 2001 Plan. Stock option activity is summarized in the following table for the dates indicated: Number of Shares Option Price per Share Weighted Outstanding at December 31, 2014 1,102,850 $12.63 to $25.91 $ 18.25 Options granted — — to — — Options exercised (154,000 ) $15.34 to $22.54 $ 20.17 Options forfeited — — to — — Outstanding at December 31, 2015 948,350 $12.63 to $25.91 $ 17.94 The following table shows the number, weighted-average exercise price, intrinsic value, and weighted average remaining contractual life of options exercisable, options not yet exercisable and total options outstanding as of December 31, 2015: Currently Currently Not Total Exercisable Exercisable Outstanding Number of options 710,650 237,700 948,350 Weighted average exercise price $ 18.10 $ 17.48 $ 17.94 Intrinsic value (in thousands) 6,641 2,369 9,010 Weighted average remaining contractual term (yrs.) 4.1 6.6 4.8 The 237,700 options that are currently not exercisable as of December 31, 2015 are expected to vest, on a weighted-average basis, over the next 1.6 years, and the Company is expected to recognize $1,066,000 of pre-tax compensation costs related to these options as they vest. The Company did not modify any option grants during 2015 or 2014. The following table shows the total intrinsic value of options exercised, the total fair value of options vested, total compensation costs for options recognized in income, and total tax benefit recognized in income related to compensation costs for options during the periods indicated: Years Ended December 31, 2015 2014 2013 Intrinsic value of options exercised $ 969,000 $ 1,209,000 $ 1,777,000 Fair value of options that vested $ 734,000 $ 965,000 $ 1,150,000 Total compensation costs for options recognized in income $ 734,000 $ 965,000 $ 1,150,000 Total tax benefit recognized in income related to compensation costs for options $ 380,000 $ 378,000 $ 484,000 Weighted average fair value of grants (per option) n/a $ 8.17 $ 8.91 The fair value of the Company’s stock option grants is estimated on the measurement date, which, for the Company, is the date of grant. The fair value of stock options is estimated using the Black-Scholes option-pricing model. The Company estimated expected market price volatility and expected term of the options based on historical data and other factors. The weighted-average assumptions used to determine the fair value of options granted are detailed in the table below: Year Ended December 31, 2015 2014 2013 Assumptions used to value option grants: Average expected terms (years) n/a 6.3 7.0 Volatility n/a 42.1 % 56.2 % Annual rate of dividends n/a 1.90 % 1.87 % Discount rate n/a 1.69 % 1.26 % Restricted stock unit (RSU) activity is summarized in the following table for the dates indicated: Service Condition Vesting RSUs Market Plus Service Condition Vesting RSUs Number Weighted Number of RSUs Weighted Average Fair Value on Date of Grant Outstanding at December 31, 2014 30,920 15,366 RSUs granted 30,348 $ 23.45 18,348 $ 21.01 RSUs added through dividend credits 962 — RSUs released (12,064 ) — RSUs forfeited/expired (3,880 ) (1,617 ) Outstanding at December 31, 2015 46,286 32,097 The 46,286 of service condition vesting RSUs outstanding as of December 31, 2015 include a feature whereby each RSU outstanding is credited with a dividend amount equal to any common stock cash dividend declared and paid, and the credited amount is divided by the closing price of the Company’s stock on the dividend payable date to arrive at an additional amount of RSUs outstanding under the original grant. The 46,286 of service condition vesting RSUs that are currently outstanding as of December 31, 2015 are expected to vest, and be released, on a weighted-average basis, over the next 1.5 years. The Company is expected to recognize $730,000 of pre-tax compensation costs related to these service condition vesting RSUs between December 31, 2015 and their vesting dates. During the 2015, the Company did not modify any service condition vesting RSUs. During the three months ended December 31, 2014, the Company modified 13,749 service condition vesting RSUs that were granted on August 11, 2014 such that their vesting schedule was changed from 100% vesting on August 11, 2018 to 25% vesting on each of August 11, 2015, 2016, 2017 and 2018. The 32,097 of market plus service condition vesting RSUs outstanding as of December 31, 2015 are expected to vest, and be released, on a weighted-average basis, over the next 2.0 years. The Company is expected to recognize $452,000 of pre-tax compensation costs related to these RSUs between December 31, 2015 and their vesting dates. As of December 31, 2015, the number of market plus service condition vesting RSUs outstanding that will actually vest, and be released, may be reduced to zero or increased to 48,146 depending on the total return of the Company’s common stock versus the total return of an index of bank stocks from the grant date to the vesting date. The Company did not modify any market plus service condition vesting RSUs during 2015 or 2014. The following table shows the compensation costs for RSUs recognized in income for the periods indicated: Year Ended December 31, 2015 2014 2013 Total compensation costs for RSUs recognized in income: Service condition vesting RSUs $ 458,000 $ 126,000 — Market plus service condition vesting RSUs $ 179,000 $ 42,000 —

Noninterest Income and Expense

Noninterest Income and Expense	12 Months Ended
	Dec. 31, 2015
Other Income and Expenses [Abstract]
Noninterest Income and Expense	Note 21 - Noninterest Income and Expense The components of other noninterest income were as follows (in thousands): Years Ended December 31, 2015 2014 2013 Service charges on deposit accounts $ 14,276 $ 11,811 $ 12,716 ATM and interchange fees 13,105 9,651 8,370 Other service fees 2,977 2,206 2,144 Mortgage banking service fees 2,164 1,869 1,774 Change in value of mortgage servicing rights (701 ) (1,301 ) 253 Total service charges and fees 31,821 24,236 25,257 Gain on sale of loans 3,064 2,032 5,602 Commissions on sale of non-deposit investment products 3,349 2,995 2,983 Increase in cash value of life insurance 2,786 1,953 1,727 Change in indemnification asset (207 ) (856 ) (1,649 ) Gain on sale of foreclosed assets 991 2,153 1,640 Sale of customer checks 492 450 377 Lease brokerage income 712 504 337 Gain (loss) on disposal of fixed assets (129 ) 49 (39 ) Gain on life insurance death benefit 155 — — Other 2,313 1,000 594 Total other noninterest income 13,526 10,280 11,572 Total noninterest income $ 45,347 $ 34,516 $ 36,829 Mortgage loan servicing fees, net of change in fair value of mortgage loan servicing rights, totaling $1,463,000, $568,000, and $2,027,000, were recorded in service charges and fees noninterest income for the years ended December 31, 2015, 2014, and 2013, respectively. The components of noninterest expense were as follows (in thousands): Years Ended December 31, 2015 2014 2013 Base salaries, net of deferred loan origination costs $ 46,822 $ 39,342 $ 34,404 Incentive compensation 6,964 5,068 4,694 Benefits and other compensation costs 17,619 13,134 12,838 Total salaries and benefits expense 71,405 57,544 51,936 Occupancy 10,126 8,203 7,405 Equipment 5,997 4,514 4,162 Data processing and software 7,670 6,512 4,844 Assessments 2,572 2,107 2,248 ATM network charges 3,371 2,996 2,480 Advertising 3,992 2,413 1,981 Professional fees 4,545 3,888 2,707 Telecommunications 3,007 2,870 2,449 Postage 1,296 949 786 Courier service 1,154 1,055 988 Foreclosed assets expense 490 528 514 Intangible amortization 1,157 446 209 Operational losses 737 764 618 Provision for foreclosed asset losses 502 208 682 Change in reserve for unfunded commitments 330 (395 ) (1,200 ) Legal settlement — — 339 Merger expense 586 4,858 312 Other 11,904 10,919 10,144 Total other noninterest expense 59,436 52,835 41,668 Total noninterest expense $ 130,841 $ 110,379 $ 93,604 Merger expense: Incentive compensation — $ 1,174 — Benefits and other compensation costs — 94 — Data processing and software $ 108 475 — Professional fees 120 2,390 $ 312 Other 358 725 — Total merger expense $ 586 $ 4,858 $ 312

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Note 22 - Income Taxes The components of consolidated income tax expense are as follows: 2015 2014 2013 (in thousands) Current tax expense Federal $ 21,076 $ 14,485 $ 11,618 State 7,139 5,016 4,261 28,215 19,501 15,879 Deferred tax expense (benefit) Federal 408 (794 ) 1,976 State 273 (199 ) 550 681 (993 ) 2,526 Total tax expense $ 28,896 $ 18,508 $ 18,405 A deferred tax asset or liability is recognized for the tax consequences of temporary differences in the recognition of revenue and expense for financial and tax reporting purposes. The net change during the year in the deferred tax asset or liability results in a deferred tax expense or benefit. Taxes recorded directly to shareholders’ equity are not included in the preceding table. These taxes (benefits) relating to changes in unfunded status of the supplemental retirement plans amounting to $904,000 in 2015, $(2,984,000) in 2014, and $1,269,000 in 2013, taxes (benefits) related to unrealized gains and losses on available-for-sale investment securities amounting to $(797,000) in 2015, $(68,000) in 2014, and $(1,780,000) in 2013, taxes (benefits) related to employee stock options of $479,000 in 2105, $97,000 in 2014, and $138,000 in 2013, were recorded directly to shareholders’ equity. The Company recognized $354,000 of tax credits and other tax benefits relating to our investments in Qualified Affordable Housing Projects for the year ended December 31, 2015. The amortization expense related to our investment in Qualified Affordable Housing Projects for the year ended December 31, 2015 was $277,000. Prior to 2015, the Company had no investments in Qualified Affordable Housing Projects. The carrying value of Low Income Housing Tax Credit Funds as of December 31, 2015 was $4,223,000. As of December 31, 2015, the Company has committed to make additional capital contributions to the Low Income Housing Tax Credit Funds in the amount of $3,330,000, and these contributions are expected to be made over the next several years. The temporary differences, tax effected, which give rise to the Company’s net deferred tax asset recorded in other assets are as follows as of December 31 for the years indicated: 2015 2014 (in thousands) Deferred tax assets: Allowance for losses and reserve for unfunded commitments $ 16,182 $ 16,284 Deferred compensation 2,827 3,115 Accrued pension liability 8,597 7,925 Accrued bonus 1,326 1,149 Other accrued expenses 143 124 Unfunded status of the supplemental retirement plans 2,411 3,315 State taxes 2,297 1,713 Share based compensation 2,701 2,534 Nonaccrual interest 1,979 2,714 OREO write downs 241 198 Acquisition cost basis 5,118 6,017 Tax credits 491 490 Net operating loss carryforwards 5,252 7,128 Other 889 625 Total deferred tax assets 50,454 53,331 Deferred tax liabilities: Securities income (1,362 ) (1,362 ) Unrealized gain on securities (902 ) (1,699 ) Depreciation (2,654 ) (3,072 ) Merger related fixed asset valuations (54 ) (54 ) Securities accretion (485 ) (287 ) Mortgage servicing rights valuation (3,118 ) (2,977 ) Indemnification asset 219 147 Core deposit intangible (2,331 ) (2,802 ) Junior subordinated debt (2,699 ) (2,782 ) Prepaid expenses and other (628 ) (737 ) Total deferred tax liability (14,014 ) (15,625 ) Net deferred tax asset $ 36,440 $ 37,706 As part of the merger with North Valley in 2014, TriCo acquired federal and state net operating loss carryforwards, capital loss carryforwards, and tax credit carryforwards. These tax attribute carryforwards will be subject to provisions of the tax law that limit the use of such losses and credits generated by a company prior to the date certain ownership changes occur. The amount of the Company’s net operating loss carryforwards that would be subject to these limitations as of December 31, 2015 were $9.2 million and $30.7 million for federal and California, respectively. The amount of the Company’s capital loss carryforwards that would be subject to these limitations as of December 31, 2015 were $78,000 and $356,000 for federal and California, respectively. The amount of the Company’s tax credits that would be subject to these limitations as of December 31, 2015 are $69,000 and $2.7 million for federal and California, respectively. Due to the limitation, a significant portion of the state tax credits will expire regardless of whether the Company generates future taxable income. As such, the Company has recorded the future benefit of these tax credits on the books at the value which is more likely than not to be realized. These tax loss and tax credit carryforwards expire at various dates beginning in 2018. The Company believes that a valuation allowance is not needed to reduce the deferred tax assets as it is more likely than not that the results of future operations will generate sufficient taxable income to realize the deferred tax assets, including the tax attribute carryforwards acquired as part of the North Valley merger. As part of the North Valley merger, TriCo inherited an unrecognized tax benefit for tax positions claimed on prior year tax returns filed by North Valley. The Company had an unrecognized tax benefit of $182,000 as of December 31, 2015, the recognition of which would reduce the Company’s tax expense by $116,000. Management does not expect the unrecognized tax benefit will materially change in the next 12 months. A summary of changes in the Company’s unrecognized tax benefit (including interest and penalties) in 2015 is as follows: (in thousands) UTB Interest/Penalties Total As of December 31, 2014 227 18 245 Lapse of the applicable statute of limitations (59 ) (4 ) (63 ) As of December 31, 2015 168 14 182 During the year ended December 31, 2015 and December 31, 2014, the Company recognized no interest and penalties related to taxes. The Company files income tax returns in the U.S. federal jurisdiction, and California. With few exceptions, the Company is no longer subject to U.S. federal and state/local income tax examinations by tax authorities for years before 2012 and 2011, respectively. The provisions for income taxes applicable to income before taxes for the years ended December 31, 2015, 2014 and 2013 differ from amounts computed by applying the statutory Federal income tax rates to income before taxes. The effective tax rate and the statutory federal income tax rate are reconciled as follows: Years Ended December 31, 2015 2014 2013 Federal statutory income tax rate 35.0 % 35.0 % 35.0 % State income taxes, net of federal tax benefit 6.6 7.0 6.8 Tax-exempt interest on municipal obligations (0.7 ) (0.4 ) (0.4 ) Tax-exempt life insurance related income (1.3 ) (1.5 ) (1.3 ) Non-deductible joint beneficiary agreement expense 0.1 0.2 0.2 Non-deductible merger expense — 1.0 — Other — 0.2 (0.1 ) Effective Tax Rate 39.7 % 41.5 % 40.2 %

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Earnings per Share	Note 23 – Earnings per Share Basic earnings per share represents income available to common shareholders divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustments to income that would result from assumed issuance. Potential common shares that may be issued by the Company relate solely from outstanding stock options, and are determined using the treasury stock method. Earnings per share have been computed based on the following: Years ended December 31, 2015 2014 2013 Net income (in thousands) $ 43,818 $ 26,108 $ 27,399 (number of shares in thousands) Average number of common shares outstanding 22,750 17,716 16,045 Effect of dilutive stock options 248 207 152 Average number of common shares outstanding used to calculate diluted earnings per share 22,998 17,923 16,197 Based on an average of quarterly computations, there were 20,625, 95,600, and 407,985 options and restricted stock units excluded from the computation of annual diluted earnings per share for the years ended December 31, 2015, 2014 and 2013, respectively, because the effect of these options and restricted stock units were antidilutive.

Comprehensive Income

Comprehensive Income	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Comprehensive Income	Note 24 – Comprehensive Income Accounting principles generally require that recognized revenue, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available-for-sale securities, are reported as a separate component of the equity section of the balance sheet, such items, along with net income, are components of comprehensive income. The components of other comprehensive income and related tax effects are as follows: Years Ended December 31, 2015 2014 2013 (in thousands) Unrealized holding losses on available for sale securities before reclassifications $ (1,895 ) $ (162 ) $ (4,232 ) Amounts reclassified out of accumulated other comprehensive income — — — Unrealized holding losses on available for sale securities after reclassifications (1,895 ) (162 ) (4,232 ) Tax effect 797 68 1,780 Unrealized holding losses on available for sale securities, net of tax (1,098 ) (94 ) (2,452 ) Change in unfunded status of the supplemental retirement plans before reclassifications 1,384 (7,253 ) 2,575 Amounts reclassified out of accumulated other comprehensive income: Amortization of prior service cost (57 ) 138 153 Amortization of actuarial losses 823 17 291 Total amounts reclassified out of accumulated other comprehensive income 766 155 444 Change in unfunded status of the supplemental retirement plans after reclassifications 2,150 (7,098 ) 3,019 Tax effect (904 ) 2,984 (1,269 ) Change in unfunded status of the supplemental retirement plans, net of tax 1,246 (4,114 ) 1,750 Change in joint beneficiary agreement liability before reclassifications 277 148 400 Amounts reclassified out of accumulated other comprehensive income — — — Change in joint beneficiary agreement liability after reclassifications 277 148 400 Tax effect — — — Change in joint beneficiary agreement liability, net of tax 277 148 400 Total other comprehensive income (loss) $ 425 $ (4,060 ) $ (302 ) The components of accumulated other comprehensive income, included in shareholders’ equity, are as follows: December 31, 2015 2014 (in thousands) Net unrealized gains on available for sale securities $ 2,145 $ 4,040 Tax effect (902 ) (1,699 ) Unrealized holding gains on available for sale securities, net of tax 1,243 2,341 Unfunded status of the supplemental retirement plans (5,735 ) (7,885 ) Tax effect 2,411 3,315 Unfunded status of the supplemental retirement plans, net of tax (3,324 ) (4,570 ) Joint beneficiary agreement liability 303 26 Tax effect — — Joint beneficiary agreement liability, net of tax 303 26 Accumulated other comprehensive loss $ (1,778 ) $ (2,203 )

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Retirement Plans	Note 25 - Retirement Plans 401(k) Plan The Company sponsors a 401(k) Plan whereby substantially all employees age 21 and over with 90 days of service may participate. Participants may contribute a portion of their compensation subject to certain limits based on federal tax laws. Prior to July 1, 2015, the Company did not contribute to the 401(k) Plan. Effective July 1, 2015, the Company initiated a discretionary matching contribution equal to 50% of participant’s elective deferrals each quarter, up to 4% of eligible compensation. The Company recorded $300,000, $0, and $0 of salaries & benefits expense attributable to the 401(k) Plan matching contribution during the years 2015, 2014, and 2013, respectively. During 2015, 2014, and 2013 the Company did not contribute to the 401(k) Plan. Employee Stock Ownership Plan Substantially all employees with at least one year of service are covered by a discretionary employee stock ownership plan (ESOP). Contributions are made to the plan at the discretion of the Board of Directors. Contributions to the plan totaling $2,651,000, $1,294,000, and $1,648,000 were made during 2015, 2014, and 2013, respectively. Expenses related to the Company’s ESOP, are included in benefits and other compensation costs under salaries and benefits expense, and were $2,282,000, $1,467,000, and $1,648,000 during 2015, 2014, and 2013, respectively. Company shares owned by the ESOP are paid dividends and included in the calculation of earnings per share exactly as other common shares outstanding. Deferred Compensation Plans The Company has deferred compensation plans for certain directors and key executives, which allow certain directors and key executives designated by the Board of Directors of the Company to defer a portion of their compensation. The Company has purchased insurance on the lives of the participants and intends to hold these policies until death as a cost recovery of the Company’s deferred compensation obligations of $6,725,000 and $7,408,000 at December 31, 2015 and 2014, respectively. Earnings credits on deferred balances totaling $538,000 in 2015, $551,000 in 2014, and $568,000 in 2013, respectively, are included in noninterest expense. Supplemental Retirement Plans The Company has supplemental retirement plans for certain directors and key executives. These plans are non-qualified defined benefit plans and are unsecured and unfunded. The Company has purchased insurance on the lives of the participants and intends to hold these policies until death as a cost recovery of the Company’s retirement obligations. The cash values of the insurance policies purchased to fund the deferred compensation obligations and the supplemental retirement obligations were $94,560,000 and $92,337,000 at December 31, 2015 and 2014, respectively. The Company recorded in other liabilities the unfunded status of the supplemental retirement plans of $5,735,000 and $7,885,000 related to the supplemental retirement plans as of December 31, 2015 and 2014, respectively. These amounts represent the amount by which the projected benefit obligations for these retirement plans exceeded the fair value of plan assets plus amounts previously accrued related to the plans. The projected benefit obligation is recorded in other liabilities. At December 31, 2015 and 2014, the unfunded status of the supplemental retirement plans of $5,735,000 and $7,885,000 were offset by a reduction of shareholders’ equity accumulated other comprehensive loss of $3,324,000 and $4,570,000, respectively, representing the after-tax impact of the unfunded status of the supplemental retirement plans, and the related deferred tax asset of $2,411,000 and $3,315,000, respectively. Amounts recognized as a component of accumulated other comprehensive loss as of year-end that have not been recognized as a component of the combined net period benefit cost of the Company’s defined benefit pension plans are presented in the following table. The Company expects to recognize approximately $549,000 of the net actuarial loss reported in the following table as of December 31, 2015 as a component of net periodic benefit cost during 2016. December 31, (in thousands) 2015 2014 Transition obligation $ 7 $ 9 Prior service cost (115 ) (173 ) Net actuarial loss 5,843 8,049 Amount included in accumulated other comprehensive loss 5,735 7,885 Deferred tax benefit (2,411 ) (3,315 ) Amount included in accumulated other comprehensive loss, net of tax $ 3,324 $ 4,570 Information pertaining to the activity in the supplemental retirement plans, using a measurement date of December 31, is as follows: December 31, 2015 2014 (in thousands) Change in benefit obligation: Benefit obligation at beginning of year $ (26,798 ) $ (14,634 ) Acquisition — (4,150 ) Service cost (1,023 ) (652 ) Interest cost (957 ) (739 ) Actuarial (loss)/gain 1,382 (7,254 ) Benefits paid 1,212 631 Benefit obligation at end of year $ (26,184 ) $ (26,798 ) Change in plan assets: Fair value of plan assets at beginning of year $ — $ — Fair value of plan assets at end of year $ — $ — Funded status $ (26,184 ) $ (26,798 ) Unrecognized net obligation existing at January 1, 1986 7 9 Unrecognized net actuarial loss 5,843 8,049 Unrecognized prior service cost (115 ) (173 ) Accumulated other comprehensive income (5,735 ) (7,885 ) Accrued benefit cost $ (26,184 ) $ (26,798 ) Accumulated benefit obligation $ (24,469 ) $ (24,739 ) The following table sets forth the net periodic benefit cost recognized for the supplemental retirement plans: Years Ended December 31, 2015 2014 2013 (in thousands) Net pension cost included the following components: Service cost-benefits earned during the period $ 1,023 $ 652 $ 743 Interest cost on projected benefit obligation 957 739 643 Amortization of net obligation at transition 2 2 2 Amortization of prior service cost (57 ) 138 153 Recognized net actuarial loss 823 16 291 Net periodic pension cost $ 2,748 $ 1,547 $ 1,832 The following table sets forth assumptions used in accounting for the plans: Years Ended December 31, 2015 2014 2013 Discount rate used to calculate benefit obligation 4.00 % 3.65 % 4.85 % Discount rate used to calculate net periodic pension cost 4.00 % 3.65 % 4.85 % Average annual increase in executive compensation 2.50 % 2.50 % 2.50 % Average annual increase in director compensation 2.50 % 2.50 % 2.50 % The following table sets forth the expected benefit payments to participants and estimated contributions to be made by the Company under the supplemental retirement plans for the years indicated: Years Ended Expected Benefit Estimated (in thousands) 2016 $ 1,104 $ 1,104 2017 983 983 2018 974 974 2019 845 845 2020 731 731 2021-2025 $ 3,490 $ 3,490

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Note 26 - Related Party Transactions Certain directors, officers, and companies with which they are associated were customers of, and had banking transactions with, the Company or the Bank in the ordinary course of business. The following table summarizes the activity in these loans for the periods indicated (in thousands): Balance December 31, 2013 $ 2,636 Advances/new loans 2,106 Removed/payments (1,610 ) Balance December 31, 2014 3,132 Advances/new loans 3,098 Removed/payments (2,029 ) Balance December 31, 2015 $ 4,201 Director Chrysler is a principal owner and CEO of Modern Building Inc. Modern Building Inc. provided construction services to the Company related to new and existing Bank facilities for aggregate payments of $1,030,000, $1,181,000, and $4,261,000, during 2015, 2014 and 2013, respectively.

Fair Value Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 27 - Fair Value Measurement The Company utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, income approach, and/or the cost approach. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability including assumptions about the risk inherent in a particular valuation technique, the effect of a restriction on the sale or use of an asset and the risk of nonperformance. Securities available-for-sale and mortgage servicing rights are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets on a nonrecurring basis, such as loans held for sale, loans held for investment and certain other assets. These nonrecurring fair value adjustments typically involve application of lower of cost or market accounting or impairment write-downs of individual assets. The Company groups assets and liabilities at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observable nature of the assumptions used to determine fair value. These levels are: Level 1 - Valuation is based upon quoted prices for identical instruments traded in active markets. Level 2 - Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Level 3 - Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques. Securities available for sale Loans held for sale Impaired originated and PNCI loans Foreclosed assets Mortgage servicing rights The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis (in thousands): Total Level 1 Level 2 Level 3 Fair value at December 31, 2015 Securities available-for-sale: Obligations of U.S. government corporations and agencies $ 313,682 — $ 313,682 — Obligations of states and political subdivisions 88,218 — 88,218 — Corporate debt securities — — — — Marketable equity securities 2,985 $ 2,985 — — Mortgage servicing rights 7,618 — — $ 7,618 Total assets measured at fair value $ 412,503 $ 2,985 $ 401,900 $ 7,618 Total Level 1 Level 2 Level 3 Fair value at December 31, 2014 Securities available-for-sale: Obligations of U.S. government corporations and agencies $ 75,120 — $ 75,120 — Obligations of states and political subdivisions 3,175 — 3,175 — Corporate debt securities 1,908 — 1,908 — Marketable equity securities 3,002 $ 3,002 — — Mortgage servicing rights 7,378 — — $ 7,378 Total assets measured at fair value $ 90,583 $ 3,002 $ 80,203 $ 7,378 Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally corresponds with the Company’s quarterly valuation process. There were no transfers between any levels during 2015 or 2014. The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the years ended December 31, 2015 and 2014. Had there been any transfer into or out of Level 3 during 2015 or 2014, the amount included in the “Transfers into (out of) Level 3” column would represent the beginning balance of an item in the period (interim quarter) during which it was transferred (in thousands): Ending Transfers Change Issuances Beginning Year ended December 31, 2015: Mortgage servicing rights $ 7,618 — $ (701 ) $ 941 $ 7,378 2014: Mortgage servicing rights $ 7,378 $ 1,944 $ (1,301 ) $ 570 $ 6,165 The Company’s method for determining the fair value of mortgage servicing rights is described in Note 1. The key unobservable inputs used in determining the fair value of mortgage servicing rights are mortgage prepayment speeds and the discount rate used to discount cash projected cash flows. Generally, any significant increases in the mortgage prepayment speed and discount rate utilized in the fair value measurement of the mortgage servicing rights will result in a negative fair value adjustments (and decrease in the fair value measurement). Conversely, a decrease in the mortgage prepayment speed and discount rate will result in a positive fair value adjustment (and increase in the fair value measurement). Note 10 contains additional information regarding mortgage servicing rights. The following table presents quantitative information about recurring Level 3 fair value measurements at December 31, 2015: Fair Value Valuation Technique Unobservable Inputs Range, Weighted Average Mortgage Servicing Rights $ 7,618 Discounted cash flow Constant prepayment rate Discount rate 6.3%-20.5%, 9.8% 10.0%-12.0%, 10.0% The tables below present the recorded amount of assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated, that had a write-down or an additional allowance provided during the periods indicated (in thousands): Total Level 1 Level 2 Level 3 Total Gains Year ended December 31, 2015 Fair value: Impaired Originated & PNCI loans $ 4,649 — — $ 4,649 $ (663 ) Foreclosed assets 1,839 1,839 (418 ) Total assets measured at fair value $ 6,488 — — $ 6,488 $ (1,081 ) Total Level 1 Level 2 Level 3 Total Gains (Losses) Year ended December 31, 2014 Fair value: Impaired Originated & PNCI loans $ 2,480 — — $ 2,480 $ (636 ) Foreclosed assets 2,611 — — 2,611 $ (137 ) Total assets measured at fair value $ 5,091 — — $ 5,091 $ (773 ) The impaired Originated and PNCI loan amount above represents impaired, collateral dependent loans that have been adjusted to fair value. When we identify a collateral dependent loan as impaired, we measure the impairment using the current fair value of the collateral, less selling costs. Depending on the characteristics of a loan, the fair value of collateral is generally estimated by obtaining external appraisals. If we determine that the value of the impaired loan is less than the recorded investment in the loan, we recognize this impairment and adjust the carrying value of the loan to fair value through the allowance for loan and lease losses. The loss represents charge-offs or impairments on collateral dependent loans for fair value adjustments based on the fair value of collateral. The carrying value of loans fully charged-off is zero. The foreclosed assets amount above represents impaired real estate that has been adjusted to fair value. Foreclosed assets represent real estate which the Bank has taken control of in partial or full satisfaction of loans. At the time of foreclosure, other real estate owned is recorded at the lower of the carrying amount of the loan or fair value less costs to sell, which becomes the property’s new basis. Any write-downs based on the asset’s fair value at the date of acquisition are charged to the allowance for loan and lease losses. After foreclosure, management periodically performs valuations such that the real estate is carried at the lower of its new cost basis or fair value, net of estimated costs to sell. Fair value adjustments on other real estate owned are recognized within net loss on real estate owned. The loss represents impairments on non-covered other real estate owned for fair value adjustments based on the fair value of the real estate. The Company’s property appraisals are primarily based on the sales comparison approach and income approach methodologies, which consider recent sales of comparable properties, including their income generating characteristics, and then make adjustments to reflect the general assumptions that a market participant would make when analyzing the property for purchase. These adjustments may increase or decrease an appraised value and can vary significantly depending on the location, physical characteristics and income producing potential of each property. Additionally, the quality and volume of market information available at the time of the appraisal can vary from period to period and cause significant changes to the nature and magnitude of comparable sale adjustments. Given these variations, comparable sale adjustments are generally not a reliable indicator for how fair value will increase or decrease from period to period. Under certain circumstances, management discounts are applied based on specific characteristics of an individual property. The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at December 31, 2015: Fair Value Valuation Technique Unobservable Inputs Range, Impaired Originated & PNCI loans $ 4,649 Sales comparison approach Income approach Adjustment for differences between comparable sales Capitalization rate (5.0)%-(5.0)%, (5.0)% Foreclosed assets (Land & construction) $ 201 Sales comparison approach Adjustment for differences between comparable sales (5.0)%-(7.0)%, (5.59)% Foreclosed assets (residential (Residential real estate) $ 814 Sales comparison approach Adjustment for differences between comparable sales (5.0)%-(8.0)%, (6.04)% Foreclosed assets (Commercial real estate) $ 824 Sales comparison approach Adjustment for differences between comparable sales (7.0)%-(9.0)%, (7.50)% In addition to the methods and assumptions used to estimate the fair value of each class of financial instrument noted above, the following methods and assumptions were used to estimate the fair value of other classes of financial instruments for which it is practical to estimate the fair value. Short-term Instruments Securities held to maturity Restricted Equity Securities Originated and PNCI loans PCI Loans FDIC Indemnification Asset - Deposit Liabilities Other Borrowings Junior Subordinated Debentures Commitments to Extend Credit and Standby Letters of Credit Fair values for financial instruments are management’s estimates of the values at which the instruments could be exchanged in a transaction between willing parties. These estimates are subjective and may vary significantly from amounts that would be realized in actual transactions. In addition, other significant assets are not considered financial assets including, any mortgage banking operations, deferred tax assets, and premises and equipment. Further, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on the fair value estimates and have not been considered in any of these estimates. The estimated fair values of financial instruments that are reported at amortized cost in the Corporation’s consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows (in thousands): December 31, 2015 December 31, 2014 Carrying Fair Carrying Fair Financial assets: Level 1 inputs: Cash and due from banks $ 94,305 $ 94,305 $ 93,150 $ 93,150 Cash at Federal Reserve and other banks 209,156 209,156 517,578 517,578 Level 2 inputs: Securities held to maturity 726,530 732,208 676,426 688,779 Restricted equity securities 16,596 N/A 16,956 N/A Loans held for sale 1,873 1,873 3,579 3,579 Level 3 inputs: Loans, net 2,486,926 2,555,297 2,282,524 2,379,155 Financial liabilities: Level 2 inputs: Deposits 3,631,266 3,630,129 3,380,423 3,380,486 Other borrowings 12,328 12,328 9,276 9,276 Level 3 inputs: Junior subordinated debt $ 56,470 $ 44,527 $ 56,272 $ 45,053 Contract Fair Contract Fair Off-balance sheet: Level 3 inputs: Commitments $ 705,316 $ 7,053 $ 656,175 $ 6,562 Standby letters of credit $ 8,330 $ 83 $ 17,531 $ 175 Overdraft privilege commitments $ 94,473 $ 945 $ 101,060 $ 1,011

TriCo Bancshares Condensed Fina

TriCo Bancshares Condensed Financial Statements (Parent Only)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
TriCo Bancshares Condensed Financial Statements (Parent Only)	Note 28 - TriCo Bancshares Condensed Financial Statements (Parent Only) Condensed Balance Sheets December 31, 2015 2014 (in thousands) Assets Cash and Cash equivalents $ 2,565 $ 2,229 Investment in Tri Counties Bank 504,655 470,797 Other assets 1,714 1,902 Total assets $ 508,934 $ 474,928 Liabilities and shareholders’ equity Other liabilities $ 348 $ 484 Junior subordinated debt 56,470 56,272 Total liabilities 56,818 56,756 Shareholders’ equity: Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 22,775,173 and 22,714,964 shares, respectively 247,587 244,318 Retained earnings 206,307 176,057 Accumulated other comprehensive loss, net (1,778 ) (2,203 ) Total shareholders’ equity 452,116 418,172 Total liabilities and shareholders’ equity $ 508,934 $ 474,928 Condensed Statements of Income Years ended December 31, 2015 2014 2013 (in thousands) Interest expense $ (1,977 ) $ (1,403 ) $ (1,247 ) Administration expense (814 ) (2,720 ) (862 ) Loss before equity in net income of Tri Counties Bank (2,791 ) (4,123 ) (2,109 ) Equity in net income of Tri Counties Bank: Distributed 13,304 8,270 8,175 Undistributed 32,131 20,720 20,446 Income tax benefit 1,174 1,241 887 Net income $ 43,818 $ 26,108 $ 27,399 Condensed Statements of Comprehensive Income Years ended December 31, 2015 2014 2013 (in thousands) Net income $ 43,818 $ 26,108 $ 27,399 Other comprehensive (loss) income, net of tax: Unrealized holding (losses) gains on securities arising during the period (1,098 ) (94 ) (2,452 ) Change in minimum pension liability 1,246 (4,114 ) 1,750 Change in joint beneficiary agreement liability 277 148 400 Other comprehensive (loss) income 425 (4,060 ) (302 ) Net income $ 44,243 $ 22,048 $ 27,097 Condensed Statements of Cash Flows Years ended December 31, 2015 2014 2013 (in thousands) Operating activities: Net income $ 43,818 $ 26,108 $ 27,399 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed equity in earnings of Tri Counties Bank (32,131 ) (20,720 ) (20,446 ) Equity compensation vesting expense 1,370 1,133 1,151 Equity compensation tax effect 68 (225 ) (356 ) Net change in other assets and liabilities (1,120 ) 671 (1,100 ) Net cash provided by operating activities 12,005 6,967 6,648 Investing activities: None Financing activities: Issuance of common stock through option exercise 660 616 251 Equity compensation tax effect (68 ) 225 356 Repurchase of common stock (412 ) (292 ) (501 ) Cash dividends paid — common (11,849 ) (7,807 ) (6,745 ) Net cash used for financing activities (11,669 ) (7,258 ) (6,639 ) (decrease) increase in cash and cash equivalents 336 (291 ) 9 Cash and cash equivalents at beginning of year 2,229 2,520 2,511 Cash and cash equivalents at end of year $ 2,565 $ 2,229 $ 2,520

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Regulatory Matters	Note 29 - Regulatory Matters The Company is subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company must meet specific capital guidelines that involve quantitative measures of the Company’s assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting practices. The Company’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Company to maintain minimum amounts and ratios (set forth in the table below) of total, Tier 1, and common equity Tier 1capital to risk-weighted assets, and of Tier 1 capital to average assets. Management believes, as of December 31, 2015, that the Company meets all capital adequacy requirements to which it is subject. The following table presents actual and required capital ratios as of December 31, 2015 for the Company and the Bank under Basel III Capital Rules. The minimum capital amounts presented include the minimum required capital levels as of December 31, 2015 based on the phased-in provisions of the Basel III Capital Rules and the minimum required capital levels as of January 1, 2019 when the Basel III Capital Rules have been fully phased-in. Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. Actual Minimum Capital Minimum Capital Required to be Amount Ratio Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of December 31, 2015: Total Capital (to Risk Weighted Assets): Consolidated $ 474,436 15.09 % $ 251,555 8.00 % $ 330,165 10.50 % N/A N/A Tri Counties Bank $ 473,327 15.06 % $ 251,418 8.00 % $ 329,985 10.50 % $ 314,272 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 435,950 13.86 % $ 188,666 6.00 % $ 267,277 8.50 % N/A N/A Tri Counties Bank $ 434,841 13.84 % $ 188,563 6.00 % $ 267,131 8.50 % $ 251,418 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 385,747 12.27 % $ 141,499 4.50 % $ 220,110 7.00 % N/A N/A Tri Counties Bank $ 434,841 13.84 % $ 141,422 4.50 % $ 219,990 7.00 % $ 204,277 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 435,950 10.79 % $ 161,562 4.00 % $ 161,562 4.00 % N/A N/A Tri Counties Bank $ 434,841 10.76 % $ 161,601 4.00 % $ 161,601 4.00 % $ 202,002 5.00 % The following table presents actual and required capital ratios as of December 31, 2104 for the Company and the Bank under the regulatory capital rules then in effect. Actual Minimum Minimum Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of December 31, 2014: Total Capital (to Risk Weighted Assets): Consolidated $ 436,955 15.63 % $ 223,603 8.0 % N/A N/A Tri Counties Bank $ 433,286 15.51 % $ 223,449 8.0 % $ 279,311 10.0 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 401,971 14.38 % $ 111,801 4.0 % N/A N/A Tri Counties Bank $ 398,325 14.26 % $ 111,724 4.0 % $ 167,587 6.0 % Tier 1 Capital (to Average Assets): Consolidated $ 401,971 10.80 % $ 148,819 4.0 % N/A N/A Tri Counties Bank $ 398,325 10.71 % $ 148,734 4.0 % $ 185,918 5.0 % As of December 31, 2015, capital levels at the Company and the Bank exceed all capital adequacy requirements under the Basel III Capital Rules on a fully phased-in basis. Based on the ratios presented above, capital levels as December 31, 2015 at the Company and the Bank exceed the minimum levels necessary to be considered “well capitalized”.

Summary of Quarterly Results of

Summary of Quarterly Results of Operations (unaudited)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Results of Operations (unaudited)	Note 30 - Summary of Quarterly Results of Operations (unaudited) The following table sets forth the results of operations for the four quarters of 2015 and 2014, and is unaudited; however, in the opinion of Management, it reflects all adjustments (which include only normal recurring adjustments) necessary to present fairly the summarized results for such periods. 2015 Quarters Ended December 31, September 30, June 30, March 31, (dollars in thousands, except per share data) Interest and dividend income: Loans: Discount accretion PCI – cash basis $ 302 $ 445 $ 404 $ 172 Discount accretion PCI – other 1,392 1,090 907 1,274 Discount accretion PNCI 573 1,590 822 1,348 All other loan interest income 32,571 30,689 29,886 28,371 Total loan interest income 34,838 33,814 32,019 31,165 Debt securities, dividends and interest bearing cash at banks (not FTE) 7,652 7,518 7,848 6,560 Total interest income 42,490 41,332 39,867 37,725 Interest expense 1,349 1,339 1,346 1,382 Net interest income 41,141 39,993 38,521 36,343 (Benefit from) provision for loan losses (908 ) (866 ) (633 ) 197 Net interest income after provision for loan losses 42,049 40,859 39,154 36,146 Noninterest income 11,445 11,642 12,080 10,180 Noninterest expense 34,684 31,439 32,436 32,282 Income before income taxes 18,810 21,062 18,798 14,044 Income tax expense 7,388 8,368 7,432 5,708 Net income $ 11,422 $ 12,694 $ 11,366 $ 8,336 Per common share: Net income (diluted) $ 0.50 $ 0.55 $ 0.49 $ 0.36 Dividends $ 0.15 $ 0.13 $ 0.13 $ 0.11 2014 Quarters Ended December 31, September 30, June 30, March 31, (dollars in thousands, except per share data) Interest and dividend income: Loans: Discount accretion PCI – cash basis $ 107 $ 290 $ 69 $ 203 Discount accretion PCI – other 919 822 811 984 Discount accretion PNCI 796 402 624 379 All other loan interest income 28,914 23,466 22,929 22,172 Total loan interest income 30,736 24,980 24,433 23,738 Debt securities, dividends and interest bearing cash at banks (not FTE) 5,671 4,151 3,985 3,421 Total interest income 36,407 29,131 28,418 27,159 Interest expense 1,437 1,082 1,075 1,087 Net interest income 34,970 28,049 27,343 26,072 (Benefit from) provision for loan losses (1,421 ) (2,977 ) 1,708 (1,355 ) Net interest income after provision for loan losses 36,391 31,026 25,635 27,427 Noninterest income 9,755 8,589 7,877 8,295 Noninterest expense 36,566 25,380 25,116 23,317 Income before income taxes 9,580 14,235 8,396 12,405 Income tax expense 3,930 6,001 3,537 5,040 Net income $ 5,650 $ 8,234 $ 4,859 $ 7,365 Per common share: Net income (diluted) $ 0.25 $ 0.50 $ 0.30 $ 0.45 Dividends $ 0.11 $ 0.11 $ 0.11 $ 0.11

Summary of Significant Accoun39

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation TriCo Bancshares (the “Company”) is a California corporation organized to act as a bank holding company for Tri Counties Bank (the “Bank”). The Company and the Bank are headquartered in Chico, California. The Bank is a California-chartered bank that is engaged in the general commercial banking business in 26 California counties. Tri Counties Bank currently operates from 55 traditional branches and 12 in-store branches. The Company has five capital subsidiary business trusts (collectively, the “Capital Trusts”) that issued trust preferred securities, including two organized by TriCo and three acquired with the acquisition of North Valley Bancorp. See Note 17 – Junior Subordinated Debt. The consolidated financial statements are prepared in accordance with accounting policies generally accepted in the United States of America and general practices in the banking industry. The financial statements include the accounts of the Company. All inter-company
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, the Company evaluates its estimates, including those related to the adequacy of the allowance for loan losses, investments, intangible assets, income taxes and contingencies. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. As described in Note 2, the Company acquired North Valley Bancorp on October 3, 2014. The acquired assets and assumed liabilities were measured at estimated fair value values under the acquisition method of accounting. The Company made significant estimates and exercised significant judgment in accounting for the acquisition. The Company determined loan fair values based on loan file reviews, loan risk ratings, appraised collateral values, expected cash flows and historical loss factors. Foreclosed assets were primarily valued based on appraised values of the repossessed loan collateral. Land and building were valued based on appraised values. An identifiable intangible was also recorded representing the fair value of the core deposit customer base based on an evaluation of the cost of such deposits relative to alternative funding sources. The fair value of time deposits and borrowings were determined based on the present value of estimated future cash flows using current rates as of the acquisition date.
Significant Group Concentration of Credit Risk	Significant Group Concentration of Credit Risk The Company grants agribusiness, commercial, consumer, and residential loans to customers located throughout the northern San Joaquin Valley, the Sacramento Valley and northern mountain regions of California. The Company has a diversified loan portfolio within the business segments located in this geographical area. The Company currently classifies all its operation into one business segment that it denotes as community banking.
Cash and Cash Equivalents	Cash and Cash Equivalents For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash on hand, amounts due from banks, and federal funds sold. Net cash flows are reported for loan and deposit transactions and other borrowings.
Investment Securities	Investment Securities The Company classifies its debt and marketable equity securities into one of three categories: trading, available for sale or held to maturity. Trading securities are bought and held principally for the purpose of selling in the near term. Held to maturity securities are those securities which the Company has the ability and intent to hold until maturity. These securities are carried at cost adjusted for amortization of premium and accretion of discount, computed by the effective interest method over their contractual lives. All other securities not included in trading or held to maturity are classified as available for sale. Available for sale securities are recorded at fair value. Unrealized gains and losses, net of the related tax effect, on available for sale securities are reported as a separate component of other accumulated comprehensive income in shareholders’ equity until realized. Premiums and discounts are amortized or accreted over the life of the related investment security as an adjustment to yield using the effective interest method. Dividend and interest income are recognized when earned. Realized gains and losses are derived from the amortized cost of the security sold. During 2015 and 2014, the Company did not have any securities classified as trading. The Company assesses other-than-temporary impairment (“OTTI”) based on whether it intends to sell a security or if it is likely that the Company would be required to sell the security before recovery of the amortized cost basis of the investment, which may be maturity. For debt securities, if we intend to sell the security or it is more likely than not that we will be required to sell the security before recovering its cost basis, the entire impairment loss would be recognized in earnings as an OTTI. If we do not intend to sell the security and it is not likely that we will be required to sell the security but we do not expect to recover the entire amortized cost basis of the security, only the portion of the impairment loss representing credit losses would be recognized in earnings. The credit loss on a security is measured as the difference between the amortized cost basis and the present value of the cash flows expected to be collected. Projected cash flows are discounted by the original or current effective interest rate depending on the nature of the security being measured for potential OTTI. The remaining impairment related to all other factors, the difference between the present value of the cash flows expected to be collected and fair value, is recognized as a charge to other comprehensive income (“OCI”). Impairment losses related to all other factors are presented as separate categories within OCI. The accretion of the amount recorded in OCI increases the carrying value of the investment and does not affect earnings. If there is an indication of additional credit losses the security is re-evaluated according to the procedures described above. No OTTI losses were recognized during 2015 and 2014.
Restricted Equity Securities	Restricted Equity Securities Restricted equity securities represent the Company’s investment in the stock of the Federal Home Loan Bank of San Francisco (“FHLB”) and are carried at par value, which reasonably approximates its fair value. While technically these are considered equity securities, there is no market for the FHLB stock. Therefore, the shares are considered as restricted investment securities. Management periodically evaluates FHLB stock for other-than-temporary impairment. Management’s determination of whether these investments are impaired is based on its assessment of the ultimate recoverability of cost rather than by recognizing temporary declines in value. The determination of whether a decline affects the ultimate recoverability of cost is influenced by criteria such as (1) the significance of any decline in net assets of the FHLB as compared to the capital stock amount for the FHLB and the length of time this situation has persisted, (2) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance of the FHLB, (3) the impact of legislative and regulatory changes on institutions and, accordingly, the customer base of the FHLB, and (4) the liquidity position of the FHLB. As a member of the FHLB system, the Bank is required to maintain a minimum level of investment in FHLB stock based on specific percentages of its outstanding mortgages, total assets, or FHLB advances. The Bank may request redemption at par value of any stock in excess of the minimum required investment. Stock redemptions are at the discretion of the FHLB.
Loans Held for Sale	Loans Held for Sale Loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by aggregate outstanding commitments from investors of current investor yield requirements. Net unrealized losses are recognized through a valuation allowance by charges to noninterest income. Mortgage loans held for sale are generally sold with the mortgage servicing rights retained by the Company. Gains or losses on the sale of loans that are held for sale are recognized at the time of the sale and determined by the difference between net sale proceeds and the net book value of the loans less the estimated fair value of any retained mortgage servicing rights.
Loans and Allowance for Loan Losses	Loans and Allowance for Loan Losses Loans originated by the Company, i.e., not purchased or acquired in a business combination, are referred to as originated loans. Originated loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal amount outstanding, net of deferred loan fees and costs. Loan origination and commitment fees and certain direct loan origination costs are deferred, and the net amount is amortized as an adjustment of the related loan’s yield over the actual life of the loan. Originated loans on which the accrual of interest has been discontinued are designated as nonaccrual loans. Originated loans are placed in nonaccrual status when reasonable doubt exists as to the full, timely collection of interest or principal, or a loan becomes contractually past due by 90 days or more with respect to interest or principal and is not well secured and in the process of collection. When an originated loan is placed on nonaccrual status, all interest previously accrued but not collected is reversed. Income on such loans is then recognized only to the extent that cash is received and where the future collection of principal is probable. Interest accruals are resumed on such loans only when they are brought fully current with respect to interest and principal and when, in the judgment of Management, the loan is estimated to be fully collectible as to both principal and interest. An allowance for loan losses for originated loans is established through a provision for loan losses charged to expense. The allowance is maintained at a level which, in Management’s judgment, is adequate to absorb probable incurred credit losses inherent in the loan portfolio as of the balance sheet date. Originated loans and deposit related overdrafts are charged against the allowance for loan losses when Management believes that the collectability of the principal is unlikely or, with respect to consumer installment loans, according to an established delinquency schedule. The allowance is an amount that Management believes will be adequate to absorb probable incurred losses inherent in existing loans, based on evaluations of the collectability, impairment and prior loss experience of loans. The evaluations take into consideration such factors as changes in the nature and size of the portfolio, overall portfolio quality, loan concentrations, specific problem loans, and current economic conditions that may affect the borrower’s ability to pay. The Company defines an originated loan as impaired when it is probable the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Impaired originated loans are measured based on the present value of expected future cash flows discounted at the loan’s original effective interest rate. As a practical expedient, impairment may be measured based on the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. When the measure of the impaired loan is less than the recorded investment in the loan, the impairment is recorded through a valuation allowance. In situations related to originated loans where, for economic or legal reasons related to a borrower’s financial difficulties, the Company grants a concession for other than an insignificant period of time to the borrower that the Company would not otherwise consider, the related loan is classified as a troubled debt restructuring (TDR). The Company strives to identify borrowers in financial difficulty early and work with them to modify to more affordable terms before their loan reaches nonaccrual status. These modified terms may include rate reductions, principal forgiveness, payment forbearance and other actions intended to minimize the economic loss and to avoid foreclosure or repossession of the collateral. In cases where the Company grants the borrower new terms that result in the loan being classified as a TDR, the Company measures any impairment on the restructuring as noted above for impaired loans. TDR loans are classified as impaired until they are fully paid off or charged off. Loans that are in nonaccrual status at the time they become TDR loans, remain in nonaccrual status until the borrower demonstrates a sustained period of performance which the Company generally believes to be six consecutive months of payments, or equivalent. Otherwise, TDR loans are subject to the same nonaccrual and charge-off policies as noted above with respect to their restructured principal balance. Credit risk is inherent in the business of lending. As a result, the Company maintains an allowance for loan losses to absorb probable incurred losses inherent in the Company’s originated loan portfolio. This is maintained through periodic charges to earnings. These charges are included in the Consolidated Statements of Income as provision for loan losses. All specifically identifiable and quantifiable losses are immediately charged off against the allowance. However, for a variety of reasons, not all losses are immediately known to the Company and, of those that are known, the full extent of the loss may not be quantifiable at that point in time. The balance of the Company’s allowance for originated loan losses is meant to be an estimate of these probable incurred losses inherent in the portfolio. The Company formally assesses the adequacy of the allowance for originated loan losses on a quarterly basis. Determination of the adequacy is based on ongoing assessments of the probable risk in the outstanding originated loan portfolio, and to a lesser extent the Company’s originated loan commitments. These assessments include the periodic re-grading of credits based on changes in their individual credit characteristics including delinquency, seasoning, recent financial performance of the borrower, economic factors, changes in the interest rate environment, growth of the portfolio as a whole or by segment, and other factors as warranted. Loans are initially graded when originated. They are re-graded as they are renewed, when there is a new loan to the same borrower, when identified facts demonstrate heightened risk of nonpayment, or if they become delinquent. Re-grading of larger problem loans occurs at least quarterly. Confirmation of the quality of the grading process is obtained by independent credit reviews conducted by consultants specifically hired for this purpose and by various bank regulatory agencies. The Company’s method for assessing the appropriateness of the allowance for originated loan losses includes specific allowances for impaired originated loans, formula allowance factors for pools of credits, and allowances for changing environmental factors (e.g., interest rates, growth, economic conditions, etc.). Allowance factors for loan pools were based on historical loss experience by product type and prior risk rating. During the three months ended March 31, 2014, the Company modified its methodology used to determine the allowance for changing environmental factors by adding a new environmental factor based on the California Home Affordability Index (“CHAI”). The CHAI measures the percentage of households in California that can afford to purchase the median priced home in California based on current home prices and mortgage interest rates. The use of the CHAI environmental factor consists of comparing the current CHAI to its historical baseline, and allows management to consider the adverse impact that a lower than historical CHAI may have on general economic activity and the performance of our borrowers. Based on an analysis of historical data, management believes this environmental factor gives a better estimate of current economic activity compared to other environmental factors that may lag current economic activity to some extent. This change in methodology resulted in no change to the allowance for loan losses as of March 31, 2014 compared to what it would have been without this change in methodology. During the three months ended June 30, 2014, the Company refined the method it uses to evaluate historical losses for the purpose of estimating the pool allowance for unimpaired loans. In the third quarter of 2010, the Company moved from a six point grading system (Grades A-F) to a nine point risk rating system (Risk Ratings 1-9), primarily to allow for more distinction within the “Pass” risk rating. Initially, there was not sufficient loss experience within the nine point scale to complete a migration analysis for all nine risk ratings, all loans risk rated Pass or 2-5 were grouped together, a loss rate was calculated for that group, and that loss rate was established as the loss rate for risk rating 4. The reserve ratios for risk ratings 2, 3 and 5 were then interpolated from that figure. As of June 30, 2014, the Company was able to compile twelve quarters of historical loss information for all risk ratings and use that information to calculate the loss rates for each of the nine risk ratings without interpolation. This refinement led to an increase of $1,438,000 in the reserve requirement for unimpaired loans, driven primarily by home equity lines of credit with a risk rating of 5 or “Pass-Watch.” During the three months ended September 30, 2015, the Company modified its methodology used to determine the allowance for home equity lines of credit that are about to exit their revolving period, or have recently entered into their amortization period and are now classified as home equity loans. This change in methodology increased the required allowance for such lines and loans by $859,000, and $459,000, respectively, and represents the increase in estimated incurred losses in these lines and loans as of September 30, 2015 due to higher required contractual principal and interest payments of such lines and loans. Loans purchased or acquired in a business combination are referred to as acquired loans. Acquired loans are valued as of the acquisition date in accordance with Financial Accounting Standards Board Accounting Standards Codification (“FASB ASC”) Topic 805, Business Combinations Loans and Debt Securities Acquired with Deteriorated Credit Quality Acquired loans that are not PCI loans are referred to as purchased not credit impaired (PNCI) loans. PNCI loans are accounted for under FASB ASC Topic 310-20, Receivables – Nonrefundable Fees and Other Costs, Throughout these financial statements, and in particular in Note 4 and Note 5, when we refer to “Loans” or “Allowance for loan losses” we mean all categories of loans, including Originated, PNCI, PCI – cash basis, and PCI - other. When we are not referring to all categories of loans, we will indicate which we are referring to – Originated, PNCI, PCI – cash basis, or PCI - other. When referring to PNCI and PCI loans we use the terms “nonaccretable difference”, “accretable yield”, or “purchase discount”. Nonaccretable difference is the difference between undiscounted contractual cash flows due and undiscounted cash flows we expect to collect, or put another way, it is the undiscounted contractual cash flows we do not expect to collect. Accretable yield is the difference between undiscounted cash flows we expect to collect and the value at which we have recorded the loan on our financial statements. On the date of acquisition, all purchased loans are recorded on our consolidated financial statements at estimated fair value. Purchase discount is the difference between the estimated fair value of loans on the date of acquisition and the principal amount owed by the borrower, net of charge offs, on the date of acquisition. We may also refer to “discounts to principal balance of loans owed, net of charge-offs”. Discounts to principal balance of loans owed, net of charge-offs is the difference between principal balance of loans owed, net of charge-offs, and loans as recorded on our financial statements. Discounts to principal balance of loans owed, net of charge-offs arise from purchase discounts, and equal the purchase discount on the acquisition date. Loans are also categorized as “covered” or “noncovered”. Covered loans refer to loans covered by a Federal Deposit Insurance Corporation (“FDIC”) loss sharing agreement. Noncovered loans refer to loans not covered by a FDIC loss sharing agreement.
Foreclosed Assets	Foreclosed Assets Foreclosed assets include assets acquired through, or in lieu of, loan foreclosure. Foreclosed assets are held for sale and are initially recorded at fair value less estimated costs to sell at the date of foreclosure, establishing a new cost basis. Physical possession of residential real estate property collateralizing a consumer mortgage loan occurs when legal title is obtained upon completion of foreclosure or when the borrower conveys all interest in the property to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Any write-downs based on the asset’s fair value less costs to sell at the date of acquisition are charged to the allowance for loan and lease losses. Any recoveries based on the asset’s fair value less estimated costs to sell in excess of the recorded value of the loan at the date of acquisition are recorded to the allowance for loan and lease losses. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed. Revenue and expenses from operations and changes in the valuation allowance are included in other noninterest expense. Gain or loss on sale of foreclosed assets is included in noninterest income. Foreclosed assets that are not subject to a FDIC loss-share agreement are referred to as noncovered foreclosed assets. Foreclosed assets acquired through FDIC-assisted acquisitions that are subject to a FDIC loss-share agreement, and all assets acquired via foreclosure of covered loans are referred to as covered foreclosed assets. Covered foreclosed assets are reported exclusive of expected reimbursement cash flows from the FDIC. Foreclosed covered loan collateral is transferred into covered foreclosed assets at the loan’s carrying value, inclusive of the acquisition date fair value discount. Covered foreclosed assets are initially recorded at estimated fair value less estimated costs to sell on the acquisition date based on similar market comparable valuations less estimated selling costs. Any subsequent valuation adjustments due to declines in fair value will be charged to noninterest expense, and will be mostly offset by noninterest income representing the corresponding increase to the FDIC indemnification asset for the offsetting loss reimbursement amount. Any recoveries of previous valuation adjustments will be credited to noninterest expense with a corresponding charge to noninterest income for the portion of the recovery that is due to the FDIC.
Premises and Equipment	Premises and Equipment Land is carried at cost. Land improvements, buildings and equipment, including those acquired under capital lease, are stated at cost less accumulated depreciation and amortization. Depreciation and amortization expenses are computed using the straight-line method over the estimated useful lives of the related assets or lease terms. Asset lives range from 3-10 years for furniture and equipment and 15-40 years for land improvements and buildings.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents the excess of costs over fair value of net assets of businesses acquired. Goodwill and other intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but instead tested for impairment at least annually. Intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values, and reviewed for impairment. The Company has an identifiable intangible asset consisting of core deposit intangibles (CDI). CDI are amortized over their respective estimated useful lives, and reviewed for impairment.
Impairment of Long-Lived Assets and Goodwill	Impairment of Long-Lived Assets and Goodwill Long-lived assets, such as premises and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposed group classified as held for sale would be presented separately in the appropriate asset and liability sections of the consolidated balance sheet. As of December 31 of each year, goodwill is tested for impairment, and is tested for impairment more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount exceeds the asset’s fair value. This determination is made at the reporting unit level. The Company may choose to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, the Company determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then goodwill is deemed not to be impaired. However, if the Company concludes otherwise, or if the Company elected not to first assess qualitative factors, then the Company performs the first step of a two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. Second, if the carrying amount of the reporting unit exceeds its fair value, an impairment loss is recognized for any excess of the carrying amount of the reporting unit’s goodwill over the implied fair value of that goodwill. The implied fair value of goodwill is determined by allocating the fair value of the reporting unit in a manner similar to a purchase price allocation. The residual fair value after this allocation is the implied fair value of the reporting unit goodwill. Currently, and historically, the Company is comprised of only one reporting unit that operates within the business segment it has identified as “community banking”. Goodwill was not impaired as of December 31, 2015 because the fair value of the reporting unit exceeded its carrying value.
Mortgage Servicing Rights	Mortgage Servicing Rights Mortgage servicing rights (MSR) represent the Company’s right to a future stream of cash flows based upon the contractual servicing fee associated with servicing mortgage loans. Our MSR arise from residential and commercial mortgage loans that we originate and sell, but retain the right to service the loans. The net gain from the retention of the servicing right is included in gain on sale of loans in noninterest income when the loan is sold. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. Servicing fees are recorded in noninterest income when earned. The Company accounts for MSR at fair value. The determination of fair value of our MSR requires management judgment because they are not actively traded. The determination of fair value for MSR requires valuation processes which combine the use of discounted cash flow models and extensive analysis of current market data to arrive at an estimate of fair value. The cash flow and prepayment assumptions used in our discounted cash flow model are based on empirical data drawn from the historical performance of our MSR, which we believe are consistent with assumptions used by market participants valuing similar MSR, and from data obtained on the performance of similar MSR. The key assumptions used in the valuation of MSR include mortgage prepayment speeds and the discount rate. These variables can, and generally will, change from quarter to quarter as market conditions and projected interest rates change. The key risks inherent with MSR are prepayment speed and changes in interest rates. The Company uses an independent third party to determine fair value of MSR.
Indemnification Asset/Liability	Indemnification Asset/Liability The Company accounts for amounts receivable or payable under its loss-share agreements entered into with the FDIC in connection with its purchase and assumption of certain assets and liabilities of Granite as indemnification assets in accordance with FASB ASC Topic 805, Business Combinations
Reserve for Unfunded Commitments	Reserve for Unfunded Commitments The reserve for unfunded commitments is established through a provision for losses – unfunded commitments charged to noninterest expense. The reserve for unfunded commitments is an amount that Management believes will be adequate to absorb probable losses inherent in existing commitments, including unused portions of revolving lines of credits and other loans, standby letters of credits, and unused deposit account overdraft privilege. The reserve for unfunded commitments is based on evaluations of the collectability, and prior loss experience of unfunded commitments. The evaluations take into consideration such factors as changes in the nature and size of the loan portfolio, overall loan portfolio quality, loan concentrations, specific problem loans and related unfunded commitments, and current economic conditions that may affect the borrower’s or depositor’s ability to pay.
Income Taxes	Income Taxes The Company’s accounting for income taxes is based on an asset and liability approach. The Company recognizes the amount of taxes payable or refundable for the current year, and deferred tax assets and liabilities for the future tax consequences that have been recognized in its financial statements or tax returns. The measurement of tax assets and liabilities is based on the provisions of enacted tax laws. A valuation allowance, if needed, reduces deferred tax assets to the expected amount most likely to be realized. Realization of deferred tax assets is dependent upon the generation of a sufficient level of future taxable income and recoverable taxes paid in prior years. Although realization is not assured, management believes it is more likely than not that all of the deferred tax assets will be realized. Interest and/or penalties related to income taxes are reported as a component of noninterest income.
Off-Balance Sheet Credit Related Financial Instruments	Off-Balance Sheet Credit Related Financial Instruments In the ordinary course of business, the Company has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded when they are funded.
Geographical Descriptions	Geographical Descriptions For the purpose of describing the geographical location of the Company’s loans, the Company has defined northern California as that area of California north of, and including, Stockton; central California as that area of the state south of Stockton, to and including, Bakersfield; and southern California as that area of the state south of Bakersfield.
Reclassifications	Reclassifications Certain amounts reported in previous consolidated financial statements have been reclassified to conform to the presentation in this report. These reclassifications did not affect previously reported net income or total shareholders’ equity.
Recent Accounting Pronouncements	Recent Accounting Pronouncements FASB issued ASU No. 2014-01, Investments—Equity Method and Joint Ventures Accounting for Investments in Qualified Affordable Housing Projects FASB issued ASU No. 2014-04, Receivables (Topic 310): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. FASB issued ASU No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2015-14, Revenue from Contracts with Customers (Topic 606) – Deferral of the Effective Date FASB issued ASU No. 2014-11, Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. FASB issued ASU No. 2014-12, Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved After the Requisite Service Period. FASB issued ASU No. 2014-14, Receivables—Troubled Debt Restructurings by Creditors (Topic 310): Classification of Certain Government Mortgage Loans upon Foreclosure. FASB issued ASU No. 2016-1 , Financial Instruments—Overall (Topic 825): Recognition and Measurement of Financial Assets and Financial Liabilities. FASB issued ASU No. 2016-2 , Leases (Topic 842).

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2015
Summary of Principal Balance Loans Acquired	The following table presents a reconciliation of the undiscounted contractual cash flows, nonaccretable difference, accretable yield, fair value, purchase discount, and principal balance of loans for the PNCI and PCI - other categories of North Valley Bancorp loans as of the acquisition date. For North Valley Bancorp PCI – other loans, the purchase discount does not necessarily represent cash flows to be collected: North Valley Bancorp Loans – October 3, 2014 (in thousands) PNCI PCI - other Total Undiscounted contractual cash flows $ 718,731 $ 15,706 $ 734,437 Undiscounted cash flows not expected to be collected (nonaccretable difference) — (6,295 ) (6,295 ) Undiscounted cash flows expected to be collected 718,731 9,411 728,142 Accretable yield at acquisition (228,815 ) — (228,815 ) Estimated fair value of loans acquired at acquisition 489,916 9,411 499,327 Purchase discount 12,721 2,077 14,798 Principal balance loans acquired $ 502,637 $ 11,488 $ 514,125
North Valley Bancorp [Member]
Schedule of Fair Value of Consideration Transferred, Identifiable Net Assets Acquired and Resulting Goodwill	The following table discloses the calculation of the fair value of consideration transferred, the total identifiable net assets acquired and the resulting goodwill relating to the North Valley Bancorp acquisition: (in thousands) North Valley Bancorp Fair value of consideration transferred: Fair value of shares issued $ 151,303 Cash consideration 7 Total fair value of consideration transferred 151,310 Asset acquired: Cash and cash equivalents 141,412 Securities available for sale 17,288 Securities held to maturity 189,950 Restricted equity securities 5,378 Loans 499,327 Foreclosed assets 695 Premises and equipment 11,936 Cash value of life insurance 38,075 Core deposit intangible 6,614 Other assets 20,064 Total assets acquired 930,739 Liabilities assumed: Deposits 801,956 Other liabilities 10,429 Junior subordinated debt 14,987 Total liabilities assumed 827,372 Total net assets acquired 103,367 Goodwill recognized $ 47,943
Summary of Estimated Fair Value Adjustments Resulting In Goodwill	A summary of the estimated fair value adjustments resulting in the goodwill recorded in the North Valley Bancorp acquisition are presented below: (in thousands) North Valley Bancorp Value of stock consideration paid to North Valley Bancorp Shareholders $ 151,303 Cash payments to North Valley Bancorp Shareholders 7 Cost basis net assets acquired (98,040 ) Fair value adjustments: Loans 5,832 Premises and Equipment (4,785 ) Core deposit intangible (6,283 ) Deferred income taxes 6,293 Junior subordinated debt (6,664 ) Other 280 Goodwill $ 47,943
Schedule of Cost Basis, Fair Value Discount and Loan Acquired	The following table presents the cost basis, fair value discount, and fair value of loans acquired from North Valley Bancorp on October 3, 2014: North Valley Bancorp Acquired Loans (in thousands) Cost Basis Discount Fair Value PNCI $ 502,637 $ (12,721 ) $ 489,916 PCI – other 11,488 (2,077 ) 9,411 Total $ 514,125 $ (14,798 ) $ 499,327

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Estimated Fair Values of Investments in Debt and Equity Securities	The amortized cost and estimated fair values of investments in debt and equity securities are summarized in the following tables: December 31, 2015 Amortized Gross Gross Estimated (in thousands) Securities Available for Sale Obligations of U.S. government corporations and agencies $ 312,917 2,761 (1,996 ) $ 313,682 Obligations of states and political subdivisions 86,823 1,428 (33 ) 88,218 Corporate debt securities — — — — Marketable equity securities 3,000 — (15 ) 2,985 Total securities available for sale $ 402,740 $ 4,189 $ (2,044 ) $ 404,885 Securities Held to Maturity Obligations of U.S. government corporations and agencies $ 711,994 8,394 (2,882 ) $ 717,506 Obligations of states and political subdivisions 14,536 277 (110 ) 14,703 Total securities held to maturity $ 726,530 $ 8,671 $ (2,992 ) $ 732,209 December 31, 2014 Amortized Gross Gross Estimated (in thousands) Securities Available for Sale Obligations of U.S. government corporations and agencies $ 71,144 4,001 (25 ) $ 75,120 Obligations of states and political subdivisions 3,130 45 — 3,175 Corporate debt securities 1,891 17 — 1,908 Marketable equity securities 3,000 2 — 3,002 Total securities available for sale $ 79,165 $ 4,065 $ (25 ) $ 83,205 Securities Held to Maturity Obligations of U.S. government corporations and agencies $ 660,836 13,055 (677 ) $ 673,214 Obligations of states and political subdivisions 15,590 130 (155 ) 15,565 Total securities held to maturity $ 676,426 $ 13,185 $ (832 ) $ 688,779
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity	For purposes of the following table, the entire outstanding balance of these mortgage-backed securities issued by U.S. government corporations and agencies is categorized based on final maturity date. Investment Securities Available for Sale Held to Maturity (In thousands) Amortized Estimated Amortized Estimated Due in one year — — — — Due after one year through five years $ 8,870 $ 9,112 $ 1,147 $ 1,158 Due after five years through ten years 24,150 25,204 830 870 Due after ten years 369,720 370,569 724,553 730,181 Totals $ 402,740 $ 404,885 $ 726,530 $ 732,209
Gross Unrealized Losses on Investment	Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) December 31, 2015 Securities Available for Sale: Obligations of U.S. government corporations and agencies $ 193,306 $ (1,996 ) — — $ 193,306 $ (1,996 ) Obligations of states and political subdivisions 6,469 (33 ) — — 6,469 (33 ) Marketable equity securities 2,985 (15 ) — — 2,985 (15 ) Total securities available-for-sale $ 202,760 $ (2,044 ) — — $ 202,760 $ (2,044 ) Securities Held to Maturity: Obligations of U.S. government corporations and agencies $ 198,481 $ (2,882 ) — — $ 198,481 $ (2,882 ) Obligations of states and political subdivisions 497 (11 ) $ 1,121 $ (99 ) 1,618 (110 ) Total securities held-to-maturity $ 198,978 $ (2,893 ) $ 1,121 $ (99 ) $ 200,099 $ (2,992 ) Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) December 31, 2014 Securities Available for Sale: Obligations of U.S. government corporations and agencies $ 6,774 $ (25 ) — — $ 6,774 $ (25 ) Obligations of states and political subdivisions — — — — — — Marketable equity securities — — — — — — Total securities available-for-sale $ 6,774 $ (25 ) — — $ 6,774 $ (25 ) Securities Held to Maturity: Obligations of U.S. government corporations and agencies $ 335 $ (1 ) $ 56,288 $ (676 ) $ 56,623 $ (677 ) Obligations of states and political subdivisions 1,600 (26 ) 1,858 (129 ) 3,458 (155 ) Total securities held-to-maturity $ 1,935 $ (27 ) $ 58,146 $ (805 ) $ 60,081 $ (832 )

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Summary of Loan Balances	A summary of loan balances follows (in thousands): December 31, 2015 Originated PNCI PCI - PCI - Total Mortgage loans on real estate: Residential 1-4 family $ 207,585 $ 104,535 — $ 2,145 $ 314,265 Commercial 1,163,643 310,864 — 23,060 1,497,567 Total mortgage loan on real estate 1,371,228 415,399 — 25,205 1,811,832 Consumer: Home equity lines of credit 285,419 29,335 4,954 2,784 322,492 Home equity loans 34,717 4,018 124 1,503 40,362 Other 28,998 3,367 — 64 32,429 Total consumer loans 349,134 36,720 5,078 4,351 395,283 Commercial 170,320 19,744 1 4,848 194,913 Construction: Residential 31,778 13,636 — 721 46,135 Commercial 66,285 8,489 — — 74,774 Total construction 98,063 22,125 — 721 120,909 Total loans, net of deferred loan fees and discounts $ 1,988,745 $ 493,988 $ 5,079 $ 35,125 $ 2,522,937 Total principal balance of loans owed, net of charge-offs $ 1,995,296 $ 507,935 $ 12,686 $ 39,693 $ 2,555,610 Unamortized net deferred loan fees (6,551 ) — — — (6,551 ) Discounts to principal balance of loans owed, net of charge-offs — (13,947 ) (7,607 ) (4,568 ) (26,122 ) Total loans, net of unamortized deferred loan fees and discounts $ 1,988,745 $ 493,988 $ 5,079 $ 35,125 $ 2,522,937 Noncovered loans $ 1,988,745 $ 493,988 $ 5,079 $ 29,890 $ 2,517,702 Covered loans — — — 5,235 5,235 Total loans, net of unamortized deferred loan fees and discounts $ 1,988,745 $ 493,988 $ 5,079 $ 35,125 $ 2,522,937 Allowance for loan losses $ (31,271 ) $ (1,848 ) $ (121 ) $ (2,771 ) $ (36,011 ) A summary of loan balances follows (in thousands): December 31, 2014 Originated PNCI PCI - PCI - Total Mortgage loans on real estate: Residential 1-4 family $ 154,594 $ 120,821 — $ 4,005 $ 279,420 Commercial 928,797 376,225 — 30,917 1,335,939 Total mortgage loan on real estate 1,083,391 497,046 — 34,922 1,615,359 Consumer: Home equity lines of credit 305,166 38,397 $ 5,478 3,543 352,584 Home equity loans 23,559 6,985 125 645 31,314 Auto Indirect 112 — — — 112 Other 28,230 4,770 — 74 33,074 Total consumer loans 357,067 50,152 5,603 4,262 417,084 Commercial 126,611 40,899 8 7,427 174,945 Construction: Residential 21,135 16,808 — 675 38,618 Commercial 24,545 11,973 — — 36,518 Total construction 45,680 28,781 — 675 75,136 Total loans, net of deferred loan fees and discounts $ 1,612,749 $ 616,878 $ 5,611 $ 47,286 $ 2,282,524 Total principal balance of loans owed, net of charge-offs $ 1,617,542 $ 634,490 $ 14,805 $ 56,016 $ 2,322,853 Unamortized net deferred loan fees (4,793 ) — — — (4,793 ) Discounts to principal balance of loans owed, net of charge-offs — (17,612 ) (9,194 ) (8,730 ) (35,536 ) Total loans, net of unamortized deferred loan fees and discounts $ 1,612,749 $ 616,878 $ 5,611 $ 47,286 $ 2,282,524 Noncovered loans $ 1,612,749 $ 616,878 $ 5,611 $ 25,018 $ 2,260,256 Covered loans — — — 22,268 22,268 Total loans, net of unamortized deferred loan fees and discounts $ 1,612,749 $ 616,878 $ 5,611 $ 47,286 $ 2,282,524 Allowance for loan losses $ (29,860 ) $ (3,296 ) $ (348 ) $ (3,081 ) $ (36,585 )
Change in Accretable Yield for PCI	The following is a summary of the change in accretable yield for PCI – other loans during the periods indicated (in thousands): Year ended December 31, 2015 2014 Change in accretable yield: Balance at beginning of period $ 14,159 $ 18,233 Accretion to interest income (6,323 ) (5,854 ) Reclassification (to) from nonaccretable difference 5,419 1,780 Balance at end of period $ 13,255 $ 14,159

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Summary of Activity in Allowance for Loan Losses, and Ending Balance of Loans, Net of Unearned Fees for Periods Indicated	The following tables summarize the activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated. Allowance for Loan Losses - Year Ended December 31, 2015 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Beginning balance $ 3,086 $ 9,227 $ 15,676 $ 1,797 $ 9 $ 719 $ 4,226 $ 1,434 $ 411 $ 36,585 Charge-offs (224 ) — (694 ) (242 ) (4 ) (972 ) (680 ) — — (2,816 ) Recoveries 204 243 666 252 42 500 677 1,728 140 4,452 (Benefit) provision (559 ) 1,973 (4,395 ) 1,331 (47 ) 441 1,048 (2,263 ) 261 (2,210 ) Ending balance $ 2,507 $ 11,443 $ 11,253 $ 3,138 — $ 688 $ 5,271 $ 899 $ 812 $ 36,011 Ending balance: Individ. evaluated for impairment $ 335 $ 395 $ 605 $ 294 — $ 74 $ 1,187 — — $ 2,890 Loans pooled for evaluation $ 2,112 $ 9,596 $ 10,423 $ 2,844 — $ 614 $ 2,983 $ 844 $ 812 $ 30,228 Loans acquired with deteriorated credit quality $ 60 $ 1,452 $ 225 — — — $ 1,101 $ 55 — $ 2,893 Loans, net of unearned fees – As of December 31, 2015 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Ending balance: Total loans $ 314,265 $ 1,497,567 $ 322,492 $ 40,362 — $ 32,429 $ 194,913 $ 46,135 $ 74,774 $ 2,522,937 Individ. evaluated for impairment $ 6,767 $ 32,407 $ 5,747 $ 1,731 — $ 288 $ 2,671 $ 4 $ 490 $ 50,105 Loans pooled for evaluation $ 305,353 $ 1,442,100 $ 309,007 $ 37,004 — $ 32,077 $ 187,393 $ 45,410 $ 74,284 $ 2,432,628 Loans acquired with deteriorated credit quality $ 2,145 $ 23,060 $ 7,738 $ 1,627 — $ 64 $ 4,849 $ 721 — $ 40,204 Allowance for Loan Losses - Year Ended December 31, 2014 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Beginning balance $ 3,154 $ 9,700 $ 16,375 $ 1,208 $ 66 $ 589 $ 4,331 $ 1,559 $ 1,263 $ 38,245 Charge-offs (171 ) (110 ) (1,094 ) (29 ) (3 ) (599 ) (479 ) (4 ) (69 ) (2,558 ) Recoveries 2 540 960 34 86 495 1,268 1,377 181 4,943 (Benefit) provision 101 (903 ) (565 ) 584 (140 ) 234 (894 ) (1,498 ) (964 ) (4,045 ) Ending balance $ 3,086 $ 9,227 $ 15,676 $ 1,797 $ 9 $ 719 $ 4,226 $ 1,434 $ 411 $ 36,585 Ending balance: Individ. evaluated for impairment $ 974 $ 410 $ 1,974 $ 284 — $ 142 $ 423 $ 60 — $ 4,267 Loans pooled for evaluation $ 1,915 $ 8,408 $ 13,251 $ 1,513 $ 9 $ 572 $ 2,569 $ 332 $ 322 $ 28,891 Loans acquired with deteriorated credit quality $ 197 $ 409 $ 451 — — $ 5 $ 1,234 $ 1,042 $ 89 $ 3,427 Loans, net of unearned fees – As of December 31, 2014 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Ending balance: Total loans $ 279,420 $ 1,335,939 $ 352,584 $ 31,314 $ 112 $ 33,074 $ 174,945 $ 38,618 $ 36,518 $ 2,282,524 Individ. evaluated for impairment $ 7,188 $ 41,932 $ 6,968 $ 1,279 $ 18 $ 323 $ 1,757 $ 2,683 $ 99 $ 62,247 Loans pooled for evaluation $ 268,227 $ 1,263,090 $ 336,595 $ 29,266 $ 94 $ 32,677 $ 165,753 $ 35,260 $ 36,419 $ 2,167,381 Loans acquired with deteriorated credit quality $ 4,005 $ 30,917 $ 9,021 $ 770 — $ 74 $ 7,435 $ 675 — $ 52,897 Allowance for Loan Losses - Year Ended December 31, 2013 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Beginning balance $ 3,523 $ 8,782 $ 21,367 $ 1,155 $ 243 $ 696 $ 4,703 $ 1,400 $ 779 $ 42,648 Charge-offs (46 ) (2,038 ) (2,651 ) (94 ) (68 ) (887 ) (1,599 ) (20 ) (140 ) (7,543 ) Recoveries 345 994 1,053 41 195 759 340 63 65 3,855 (Benefit) provision (668 ) 1,962 (3,394 ) 106 (304 ) 21 887 116 559 (715 ) Ending balance $ 3,154 $ 9,700 $ 16,375 $ 1,208 $ 66 $ 589 $ 4,331 $ 1,559 $ 1,263 $ 38,245 Ending balance: Individ. evaluated for impairment $ 775 $ 1,198 $ 1,140 $ 169 $ 1 $ 8 $ 585 $ 91 $ 8 $ 3,975 Loans pooled for evaluation $ 2,039 $ 7,815 $ 14,749 $ 1,039 $ 65 $ 581 $ 2,402 $ 751 $ 789 $ 30,230 Loans acquired with deteriorated credit quality $ 340 $ 687 $ 486 — — — $ 1,344 $ 717 $ 466 $ 4,040 Loans, net of unearned fees – As of December 31, 2013 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Ending balance: Total loans $ 195,013 $ 912,850 $ 339,866 $ 14,588 $ 946 $ 27,763 $ 131,878 $ 31,933 $ 17,170 $ 1,672,007 Individ. evaluated for impairment $ 7,342 $ 59,936 $ 6,918 $ 778 $ 60 $ 90 $ 3,177 $ 2,756 $ 178 $ 81,235 Loans pooled for evaluation $ 183,015 $ 822,654 $ 322,865 $ 13,324 $ 886 $ 27,592 $ 122,166 $ 27,611 $ 16,947 $ 1,537,060 Loans acquired with deteriorated credit quality $ 4,656 $ 30,260 $ 10,083 $ 486 — $ 81 $ 6,535 $ 1,566 $ 45 $ 53,712
Presentation of Credit Quality Indicators	The following tables present ending loan balances by loan category and risk grade for the periods indicated: Credit Quality Indicators – As of December 31, 2015 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Originated loans: Pass $ 199,837 $ 1,118,868 $ 275,251 $ 31,427 — $ 28,339 $ 166,559 $ 31,440 $ 66,285 $ 1,918,006 Special mention 2,018 10,321 2,494 1,027 — 415 1,037 334 — 17,646 Substandard 5,730 34,454 7,674 2,263 — 244 2,724 4 — 53,093 Loss — — — — — — — — — — Total originated $ 207,585 $ 1,163,643 $ 285,419 $ 34,717 — $ 28,998 $ 170,320 $ 31,778 $ 66,285 $ 1,988,745 PNCI loans: Pass $ 102,895 $ 293,935 $ 27,378 $ 3,789 — $ 3,164 $ 19,666 $ 13,636 $ 8,489 $ 472,952 Special mention 600 10,795 445 80 — 74 — — — 11,994 Substandard 1,040 6,134 1,512 149 — 129 78 — — 9,042 Loss — — — — — — — — — — Total PNCI $ 104,535 $ 310,864 $ 29,335 $ 4,018 — $ 3,367 $ 19,744 $ 13,636 $ 8,489 $ 493,988 PCI loans $ 2,145 $ 23,060 $ 7,738 $ 1,627 — $ 64 $ 4,849 $ 721 — $ 40,204 Total loans $ 314,265 $ 1,497,567 $ 322,492 $ 40,362 — $ 32,429 $ 194,913 $ 46,135 $ 74,774 $ 2,522,937 Credit Quality Indicators – As of December 31, 2014 RE Mortgage Home Equity Auto Other C&I Construction Total (in thousands) Resid. Comm. Lines Loans Resid. Comm. Originated loans: Pass $ 146,949 $ 883,102 $ 292,244 $ 20,976 $ 66 $ 27,396 $ 124,707 $ 18,112 $ 24,436 $ 1,537,988 Special mention 1,122 11,521 3,590 743 11 591 636 622 — 18,836 Substandard 6,523 34,174 9,332 1,840 35 243 1,268 2,401 109 55,925 Loss — — — — — — — — — — Total originated $ 154,594 $ 928,797 $ 305,166 $ 23,559 $ 112 $ 28,230 $ 126,611 $ 21,135 $ 24,545 $ 1,612,749 PNCI loans: Pass $ 119,643 $ 359,537 $ 36,531 $ 6,813 — $ 4,399 $ 40,628 $ 16,808 $ 11,973 $ 596,332 Special mention 547 12,979 936 147 — 230 268 — — 15,107 Substandard 631 3,709 930 25 — 141 3 — — 5,439 Loss — — — — — — — — — — Total PNCI $ 120,821 $ 376,225 $ 38,397 $ 6,985 — $ 4,770 $ 40,899 $ 16,808 $ 11,973 $ 616,878 PCI loans $ 4,005 $ 30,917 $ 9,021 $ 770 — $ 74 $ 7,435 $ 675 — $ 52,897 Total loans $ 279,420 $ 1,335,939 $ 352,584 $ 31,314 $ 112 $ 33,074 $ 174,945 $ 38,618 $ 36,518 $ 2,282,524
Analysis of Past Due and Nonaccrual Loans	The following table shows the ending balance of current, past due, and nonaccrual originated loans by loan category as of the date indicated: Analysis of Past Due and Nonaccrual Originated Loans – As of December 31, 2015 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Originated loan balance: Past due: 30-59 Days $ 791 $ 200 $ 1,033 $ 402 — $ 12 $ 2,197 — — $ 4,635 60-89 Days — 491 324 341 — 40 — — — 1,196 > 90 Days 271 3,425 520 82 — 19 24 — — 4,341 Total past due $ 1,062 $ 4,116 $ 1,877 $ 825 — $ 71 $ 2,221 — — $ 10,172 Current 206,523 1,159,527 283,542 33,892 — 28,927 168,099 — — 1,978,573 Total orig. loans $ 207,585 $ 1,163,643 $ 285,419 $ 34,717 — $ 28,998 $ 170,320 $ 31,778 $ 66,285 $ 1,988,745 > 90 Days and still accruing — — — — — — — — — — Nonaccrual loans $ 3,045 $ 14,196 $ 3,379 $ 1,195 — $ 21 $ 976 $ 12 — $ 22,824 The following table shows the ending balance of current, past due, and nonaccrual PNCI loans by loan category as of the date indicated: Analysis of Past Due and Nonaccrual PNCI Loans – As of December 31, 2015 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total PNCI loan balance: Past due: 30-59 Days $ 3,106 $ 4,037 $ 92 $ 23 — — $ 1 — — $ 7,259 60-89 Days — — — — — $ 13 — — — 13 > 90 Days 58 748 275 71 — 10 — — $ 490 1,652 Total past due $ 3,164 $ 4,785 $ 367 $ 94 — $ 23 $ 1 — $ 490 $ 8,924 Current 101,371 306,079 28,968 3,924 — 3,344 19,743 $ 13,636 7,999 485,064 Total PNCI loans $ 104,535 $ 310,864 $ 29,335 $ 4,018 — $ 3,367 $ 19,744 $ 13,636 $ 8,489 $ 493,988 > 90 Days and still accruing — — — — — — — — — — Nonaccrual loans $ 348 $ 3,742 $ 676 $ 109 — $ 33 — — $ 490 $ 5,398 The following table shows the ending balance of current, past due, and nonaccrual originated loans by loan category as of the date indicated: Analysis of Past Due and Nonaccrual Originated Loans – As of December 31, 2014 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Originated loan balance: Past due: 30-59 Days $ 1,296 $ 735 $ 2,066 $ 615 $ 4 $ 64 $ 739 — — $ 5,519 60-89 Days 919 — 296 192 — 24 99 — — 1,530 > 90 Days 100 900 754 202 17 46 61 — — 2,080 Total past due $ 2,315 $ 1,635 $ 3,116 $ 1,009 $ 21 $ 134 $ 899 — — $ 9,129 Current 152,279 927,162 302,050 22,550 91 28,096 125,712 21,135 24,545 1,603,620 Total orig. loans $ 154,594 $ 928,797 $ 305,166 $ 23,559 $ 112 $ 28,230 $ 126,611 $ 21,135 $ 24,545 $ 1,612,749 > 90 Days and still accruing — — — — — — — — — — Nonaccrual loans $ 3,430 $ 20,736 $ 4,336 $ 1,197 $ 18 $ 66 $ 246 $ 2,401 $ 99 $ 32,529 The following table shows the ending balance of current, past due, and nonaccrual PNCI loans by loan category as of the date indicated: Analysis of Past Due and Nonaccrual PNCI Loans – As of December 31, 2014 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total PNCI loan balance: Past due: 30-59 Days $ 2,041 $ 260 $ 275 — — $ 25 $ 67 — — $ 2,668 60-89 Days 24 — 118 — — 3 — — — 145 > 90 Days 239 — 73 25 — 76 — — — 413 Total past due $ 2,304 $ 260 $ 466 $ 25 — $ 104 $ 67 — — $ 3,226 Current 118,517 375,965 37,931 6,960 — 4,666 40,832 16,808 11,973 $ 613,652 Total PNCI loans $ 120,821 $ 376,225 $ 38,397 $ 6,985 — $ 4,770 $ 40,899 $ 16,808 $ 11,973 $ 616,878 > 90 Days and still accruing — — — — — — — — — — Nonaccrual loans $ 799 $ 366 $ 346 $ 25 — $ 110 — — — $ 1,646
Impaired Loans	Impaired originated loans are those where management has concluded that it is probable that the borrower will be unable to pay all amounts due under the contractual terms. The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired Originated and PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated. Impaired Originated Loans – As of December 31, 2015 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 3,886 $ 27,109 $ 2,963 $ 947 — $ 20 $ 576 $ 4 — $ 35,505 Unpaid principal $ 5,998 $ 29,678 $ 6,079 $ 1,349 — $ 35 $ 688 $ 65 — $ 43,892 Average recorded Investment $ 3,586 $ 32,793 $ 2,982 $ 848 — $ 29 $ 494 $ 1,202 $ 50 $ 41,984 Interest income Recognized $ 81 $ 893 $ 23 $ 5 — — $ 29 — — $ 1,031 With an allowance recorded: Recorded investment $ 2,006 $ 1,418 $ 1,724 $ 674 — $ 1 $ 2,094 — — $ 7,917 Unpaid principal $ 2,073 $ 1,453 $ 1,904 $ 701 — $ 1 $ 2,117 — — $ 8,249 Related allowance $ 335 $ 146 $ 525 $ 256 — $ 1 $ 1,187 — — $ 2,450 Average recorded Investment $ 2,365 $ 2,180 $ 2,455 $ 589 — $ 23 $ 1,716 $ 141 — $ 9,469 Interest income Recognized $ 49 $ 74 $ 31 $ 26 — — $ 122 — — $ 302 Impaired PNCI Loans – As of December 31, 2015 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 875 $ 1,132 $ 454 $ 71 — $ 33 $ 1 — $ 490 $ 3,056 Unpaid principal $ 908 $ 1,248 $ 505 $ 73 — $ 52 $ 1 — $ 490 $ 3,277 Average recorded Investment $ 609 $ 749 $ 400 $ 48 — $ 35 $ 4 — $ 245 $ 2,090 Interest income Recognized $ 31 $ 32 $ 3 $ 2 — $ 1 — — $ 18 $ 87 With an allowance recorded: Recorded investment — $ 2,748 $ 606 $ 39 — $ 234 — — — $ 3,627 Unpaid principal — $ 2,858 $ 612 $ 40 — $ 234 — — — $ 3,744 Related allowance — $ 248 $ 80 $ 39 — $ 73 — — — $ 440 Average recorded Investment $ 417 $ 1,447 $ 521 $ 19 — $ 227 — — — $ 2,631 Interest income Recognized — $ 149 $ 14 — — $ 11 — — — $ 174 Impaired Originated Loans – As of December 31, 2014 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 3,287 $ 38,477 $ 3,001 $ 750 $ 14 $ 25 $ 412 $ 2,401 $ 99 $ 48,466 Unpaid principal $ 5,138 $ 41,949 $ 6,094 $ 1,187 $ 49 $ 32 $ 433 $ 6,588 $ 190 $ 61,660 Average recorded Investment $ 3,826 $ 45,915 $ 3,355 $ 651 $ 35 $ 21 $ 1,030 $ 2,437 $ 84 $ 57,354 Interest income Recognized $ 38 $ 995 $ 26 $ 6 — $ 1 $ 26 — $ 3 $ 1,095 With an allowance recorded: Recorded investment $ 2,724 $ 2,943 $ 3,185 $ 504 $ 4 $ 41 $ 1,338 $ 282 — $ 11,021 Unpaid principal $ 2,865 $ 3,101 $ 3,533 $ 597 $ 6 $ 41 $ 1,438 $ 282 — $ 11,863 Related allowance $ 797 $ 302 $ 1,769 $ 284 — $ 11 $ 423 $ 60 — $ 3,646 Average recorded Investment $ 2,677 $ 4,119 $ 2,982 $ 365 $ 4 $ 25 $ 1,428 $ 283 $ 55 $ 11,938 Interest income Recognized $ 91 $ 144 $ 71 $ 13 — — $ 71 $ 19 — $ 409 Impaired PNCI Loans – As of December 31, 2014 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 343 $ 366 $ 346 $ 25 — $ 37 $ 7 — — $ 1,124 Unpaid principal $ 353 $ 2,620 $ 374 $ 25 — $ 54 $ 7 — — $ 3,433 Average recorded Investment $ 246 $ 753 $ 287 $ 12 — $ 36 $ 10 — — $ 1,344 Interest income Recognized $ 14 — $ (1 ) — — — $ 1 — — $ 14 With an allowance recorded: Recorded investment $ 834 $ 146 $ 436 — — $ 220 — — — $ 1,636 Unpaid principal $ 852 $ 146 $ 436 — — $ 220 — — — $ 1,654 Related allowance $ 177 $ 108 $ 205 — — $ 131 — — — $ 621 Average recorded Investment $ 516 $ 148 $ 319 — — $ 124 — — — $ 1,107 Interest income Recognized $ 8 $ 8 $ 20 — — $ 12 — — — $ 48
Troubled Debt Restructurings	The following tables show certain information regarding Troubled Debt Restructurings (TDRs) that occurred during the periods indicated: TDR Information for the Year Ended December 31, 2015 RE Mortgage Home Equity Auto Other Construction (dollars in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Number 4 5 2 2 — 2 8 — — 23 Pre-mod outstanding principal balance $ 800 $ 1,518 $ 301 $ 315 — $ 89 $ 956 — — $ 3,979 Post-mod outstanding principal balance $ 801 $ 1,517 $ 301 $ 321 — $ 89 $ 944 — — $ 3,973 Financial impact due to TDR taken as additional provision $ 8 $ (5 ) — $ 38 — $ 5 $ 405 — — $ 451 Number that defaulted during the period 4 2 3 1 — — — — — 10 Recorded investment of TDRs that defaulted during the period $ 221 $ 280 $ 182 $ 53 — — — — — $ 736 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — $ (9 ) — — — — — $ (9 ) TDR Information for the Year Ended December 31, 2014 RE Mortgage Home Equity Auto Indirect Other Consum. C&I Construction Total (dollars in thousands) Resid. Comm. Lines Loans Resid. Comm. Number 5 7 6 2 — 1 7 1 2 31 Pre-mod outstanding principal balance $ 1,048 $ 1,980 $ 940 $ 100 — $ 147 $ 218 $ 102 $ 219 $ 4,754 Post-mod outstanding principal balance $ 1,050 $ 1,890 $ 967 $ 102 — $ 147 $ 219 $ 85 $ 196 $ 4,656 Financial impact due to TDR taken as additional provision $ 91 $ 22 — $ (1 ) — $ 66 $ 101 — — $ 279 Number that defaulted during the period 2 2 1 — — — 1 — — 6 Recorded investment of TDRs that defaulted during the period $ 344 $ 423 $ 20 — — — $ 116 — — $ 903 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — — — — $ (8 ) — — $ (8 )

Foreclosed Assets (Tables)

Foreclosed Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Summary of Activity in Balance of Foreclosed Assets	A summary of the activity in the balance of foreclosed assets follows (dollars in thousands): Year ended December 31, 2015 Year ended December 31, 2014 Noncovered Covered Total Noncovered Covered Total Beginning balance, net $ 4,449 $ 445 $ 4,894 $ 5,588 $ 674 $ 6,262 Acquisitions — — — 695 — 695 Additions/transfers from loans 5,880 (445 ) 5,435 5,753 — 5,753 Dispositions/sales (4,458 ) — (4,458 ) (7,391 ) (217 ) (7,608 ) Valuation adjustments (502 ) — (502 ) (196 ) (12 ) (208 ) Ending balance, net $ 5,369 — $ 5,369 $ 4,449 $ 445 $ 4,894 Ending valuation allowance $ (572 ) — $ (572 ) $ (208 ) — $ (208 ) Ending number of foreclosed assets 26 — 26 28 1 29 Proceeds from sale of foreclosed assets $ 5,449 — $ 5,449 $ 9,517 $ 245 $ 9,762 Gain on sale of foreclosed assets $ 991 — $ 991 $ 2,125 $ 28 $ 2,153

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	Premises and equipment were comprised of: December 31, December 31, (In thousands) Land & land improvements $ 8,909 $ 8,933 Buildings 38,643 39,638 Furniture and equipment 31,081 28,446 78,633 77,017 Less: Accumulated depreciation (35,518 ) (33,570 ) 43,115 43,447 Construction in progress 696 46 Total premises and equipment $ 43,811 $ 43,493

Cash Value of Life Insurance (T

Cash Value of Life Insurance (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, All Other Investments [Abstract]
Summary of Activity in Balance of Cash Value of Life Insurance	A summary of the activity in the balance of cash value of life insurance follows (dollars in thousands): Year ended December 31, 2015 2014 Beginning balance $ 92,337 $ 52,309 Acquisitions — 38,075 Increase in cash value of life insurance 2,786 1,953 Death benefit receivable in excess of cash value 155 — Death benefit receivable (718 ) — Ending balance $ 94,560 $ 92,337 End of period death benefit $ 166,299 $ 165,966 Number of policies owned 187 189 Insurance companies used 14 14 Current and former employees and directors covered 59 60

Goodwill and Other Intangible47

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Goodwill Intangible	The following table summarizes the Company’s goodwill intangible as of the dates indicated: December 31, December 31, (Dollar in Thousands) 2015 Additions Reductions 2014 Goodwill $ 63,462 — — $ 63,462
Summary of Core Deposit Intangibles	The following table summarizes the Company’s core deposit intangibles as of the dates indicated: (Dollar in Thousands) December 31, Additions Reductions/ Fully December 31, Core deposit intangibles $ 8,074 — — — $ 8,074 Accumulated amortization (2,180 ) $ (1,157 ) — — (1,023 ) Core deposit intangibles, net $ 5,894 $ (1,157 ) — — $ 7,051
Estimated Core Deposit Intangible Amortization	The following table summarizes the Company’s estimated core deposit intangible amortization (dollars in thousands): Years Ended Estimated Core Deposit 2016 $ 1,157 2017 1,109 2018 1,044 2019 948 2020 948 Thereafter $ 688

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Fair Value of Mortgage Servicing Rights	The following tables summarize the activity in, and the main assumptions we used to determine the fair value of mortgage servicing rights for the periods indicated (dollars in thousands): Years ended December 31, 2015 2014 2013 Balance at beginning of period $ 7,378 $ 6,165 $ 4,552 Acquisition — 1,944 — Originations 941 570 1,360 Change in fair value (701 ) (1,301 ) 253 Balance at end of period $ 7,618 $ 7,378 $ 6,165 Contractually specified servicing fees, late fees and ancillary fees earned $ 2,164 $ 1,869 $ 1,774 Balance of loans serviced at: Beginning of period $ 840,288 $ 680,197 $ 666,512 End of period $ 817,917 $ 840,288 $ 680,197 Weighted-average prepayment speed (CPR) 9.8 % 12.0 % 10.3 % Weighted-average discount rate 10.0 % 10.0 % 10.0 %

Indemnification Asset (Tables)

Indemnification Asset (Tables)	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Summary of Activity in Balance of Indemnification Asset (Liability)	A summary of the activity in the balance of indemnification asset (liability) included in other assets is follows (in thousands): Year ended December 31, 2015 2014 2013 Beginning balance $ (349 ) $ 206 $ 1,997 Effect of actual covered losses (recoveries) and increase (decrease) in estimated future covered losses (93 ) (853 ) (1,419 ) Change in estimated “true up” liability (71 ) (100 ) — Reimbursable (revenue) expenses, net 4 85 (159 ) Payments made (received) (12 ) 313 (213 ) Ending balance $ (521 ) $ (349 ) $ 206 Amount of indemnification asset (liability) recorded in other assets $ 77 $ (349 ) $ 206 Amount of indemnification liability recorded in other liabilities (598 ) — — Ending balance $ (521 ) $ (349 ) $ 206

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Summary of Other Assets	Other assets were comprised of (in thousands): As of December 31, 2015 2014 Deferred tax asset, net (Note 22) $ 36,440 $ 37,706 Prepaid expense 3,062 3,378 Software 1,290 1,327 Advanced compensation 673 908 Capital Trusts 1,696 1,690 Investment in Low Housing Tax Credit Funds 4,223 — Prepaid Taxes — 5,599 Miscellaneous other assets 1,207 1,127 Total other assets $ 48,591 $ 51,735

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Summary of Balances of Deposits	A summary of the balances of deposits follows (in thousands): December 31, 2015 2014 Noninterest-bearing demand $ 1,155,695 $ 1,083,900 Interest-bearing demand 853,961 782,385 Savings 1,281,540 1,156,126 Time certificates, $250,000 and over 75,897 38,217 Other time certificates 264,173 319,795 Total deposits $ 3,631,266 $ 3,380,423
Schedule of Maturities of Time Deposits	At December 31, 2015, the scheduled maturities of time deposits were as follows (in thousands): Scheduled Maturities 2016 $ 285,400 2017 27,754 2018 10,331 2019 5,805 2020 10,777 Thereafter 3 Total $ 340,070

Reserve for Unfunded Commitme52

Reserve for Unfunded Commitments (Tables)	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Summary of Activity in Reserve for Unfunded Commitments	The following tables summarize the activity in reserve for unfunded commitments for the periods indicated (dollars in thousands): Years ended December 31, 2015 2014 2013 Balance at beginning of period $ 2,145 $ 2,415 $ 3,615 Acquisitions — 125 — Provision for losses – Unfunded commitments 330 (395 ) (1,200 ) Balance at end of period $ 2,475 $ 2,145 $ 2,415

Other Liabilities (Tables)

Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Components of Other Liabilities	Other liabilities were comprised of (in thousands): December 31, 2015 2014 Deferred compensation $ 6,725 $ 7,408 Pension liability 26,182 26,798 Joint beneficiary agreements 2,529 2,728 Low income housing tax credit fund commitments 3,330 — Accrued salaries and benefits expense 3,851 5,407 Loan escrow and servicing payable 2,037 1,938 Deferred revenue 1,082 1,091 Unsettled investment security purchases 17,072 — Miscellaneous other liabilities 2,485 3,822 Total other liabilities $ 65,293 $ 49,192

Other Borrowings (Tables)

Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Summary of Balances of Other Borrowings	A summary of the balances of other borrowings follows: December 31, 2015 2014 (in thousands) Other collateralized borrowings, fixed rate, as of December 31, 2015 of 0.05%, payable on January 4, 2016 $ 12,328 $ 9,276 Total other borrowings $ 12,328 $ 9,276

Junior Subordinated Debt (Table

Junior Subordinated Debt (Tables)	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Summary of Terms and Recorded Balance of Subordinated Debenture	The following table summarizes the terms and recorded balance of each subordinated debenture as of the date indicated (dollars in thousands): Subordinated Debt Series Maturity Face Coupon As of December 31, Current Recorded TriCo Cap Trust I 10/7/2033 $ 20,619 3.05 % 3.37 % $ 20,619 TriCo Cap Trust II 7/23/2034 20,619 2.55 % 2.87 % 20,619 North Valley Trust II 4/24/2033 6,186 3.25 % 3.58 % 5,055 North Valley Trust III 4/24/2034 5,155 2.80 % 3.12 % 3,966 North Valley Trust IV 3/15/2036 10,310 1.33 % 1.84 % 6,211 $ 62,889 $ 56,470

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Commitments under Non-Cancelable Operating Leases with Initial or Remaining Terms of One Year or More	At December 31, 2015, future minimum commitments under non-cancelable operating leases with initial or remaining terms of one year or more are as follows: Operating Leases (in thousands) 2016 $ 3,067 2017 2,400 2018 1,755 2019 1,211 2020 2,382 Thereafter 659 Future minimum lease payments $ 11,474
Summary of Bank's Commitments and Contingent Liabilities	The following table presents a summary of the Bank’s commitments and contingent liabilities: (in thousands) December 31, December 31, Financial instruments whose amounts represent risk: Commitments to extend credit: Commercial loans $ 196,399 $ 177,557 Consumer loans 394,278 392,705 Real estate mortgage loans 42,793 36,139 Real estate construction loans 71,846 49,774 Standby letters of credit 8,330 17,531 Deposit account overdraft privilege 94,473 101,060

Stock Options and Other Equit57

Stock Options and Other Equity-Based Incentive Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Option Activity	Stock option activity is summarized in the following table for the dates indicated: Number of Shares Option Price per Share Weighted Outstanding at December 31, 2014 1,102,850 $12.63 to $25.91 $ 18.25 Options granted — — to — — Options exercised (154,000 ) $15.34 to $22.54 $ 20.17 Options forfeited — — to — — Outstanding at December 31, 2015 948,350 $12.63 to $25.91 $ 17.94
Summary of Options Outstanding	The following table shows the number, weighted-average exercise price, intrinsic value, and weighted average remaining contractual life of options exercisable, options not yet exercisable and total options outstanding as of December 31, 2015: Currently Currently Not Total Exercisable Exercisable Outstanding Number of options 710,650 237,700 948,350 Weighted average exercise price $ 18.10 $ 17.48 $ 17.94 Intrinsic value (in thousands) 6,641 2,369 9,010 Weighted average remaining contractual term (yrs.) 4.1 6.6 4.8
Information about Options	The following table shows the total intrinsic value of options exercised, the total fair value of options vested, total compensation costs for options recognized in income, and total tax benefit recognized in income related to compensation costs for options during the periods indicated: Years Ended December 31, 2015 2014 2013 Intrinsic value of options exercised $ 969,000 $ 1,209,000 $ 1,777,000 Fair value of options that vested $ 734,000 $ 965,000 $ 1,150,000 Total compensation costs for options recognized in income $ 734,000 $ 965,000 $ 1,150,000 Total tax benefit recognized in income related to compensation costs for options $ 380,000 $ 378,000 $ 484,000 Weighted average fair value of grants (per option) n/a $ 8.17 $ 8.91
Weighted-Average Assumptions Used to Determine Fair Value of Options Granted	The weighted-average assumptions used to determine the fair value of options granted are detailed in the table below: Year Ended December 31, 2015 2014 2013 Assumptions used to value option grants: Average expected terms (years) n/a 6.3 7.0 Volatility n/a 42.1 % 56.2 % Annual rate of dividends n/a 1.90 % 1.87 % Discount rate n/a 1.69 % 1.26 %
Restricted Stock Unit (RSU) Activity	Restricted stock unit (RSU) activity is summarized in the following table for the dates indicated: Service Condition Vesting RSUs Market Plus Service Condition Vesting RSUs Number Weighted Number of RSUs Weighted Average Fair Value on Date of Grant Outstanding at December 31, 2014 30,920 15,366 RSUs granted 30,348 $ 23.45 18,348 $ 21.01 RSUs added through dividend credits 962 — RSUs released (12,064 ) — RSUs forfeited/expired (3,880 ) (1,617 ) Outstanding at December 31, 2015 46,286 32,097
Summary of Compensation Costs for RSUs	The following table shows the compensation costs for RSUs recognized in income for the periods indicated: Year Ended December 31, 2015 2014 2013 Total compensation costs for RSUs recognized in income: Service condition vesting RSUs $ 458,000 $ 126,000 — Market plus service condition vesting RSUs $ 179,000 $ 42,000 —

Noninterest Income and Expense

Noninterest Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2015
Other Income and Expenses [Abstract]
Components of Other Noninterest Income	The components of other noninterest income were as follows (in thousands): Years Ended December 31, 2015 2014 2013 Service charges on deposit accounts $ 14,276 $ 11,811 $ 12,716 ATM and interchange fees 13,105 9,651 8,370 Other service fees 2,977 2,206 2,144 Mortgage banking service fees 2,164 1,869 1,774 Change in value of mortgage servicing rights (701 ) (1,301 ) 253 Total service charges and fees 31,821 24,236 25,257 Gain on sale of loans 3,064 2,032 5,602 Commissions on sale of non-deposit investment products 3,349 2,995 2,983 Increase in cash value of life insurance 2,786 1,953 1,727 Change in indemnification asset (207 ) (856 ) (1,649 ) Gain on sale of foreclosed assets 991 2,153 1,640 Sale of customer checks 492 450 377 Lease brokerage income 712 504 337 Gain (loss) on disposal of fixed assets (129 ) 49 (39 ) Gain on life insurance death benefit 155 — — Other 2,313 1,000 594 Total other noninterest income 13,526 10,280 11,572 Total noninterest income $ 45,347 $ 34,516 $ 36,829
Components of Noninterest Expense	The components of noninterest expense were as follows (in thousands): Years Ended December 31, 2015 2014 2013 Base salaries, net of deferred loan origination costs $ 46,822 $ 39,342 $ 34,404 Incentive compensation 6,964 5,068 4,694 Benefits and other compensation costs 17,619 13,134 12,838 Total salaries and benefits expense 71,405 57,544 51,936 Occupancy 10,126 8,203 7,405 Equipment 5,997 4,514 4,162 Data processing and software 7,670 6,512 4,844 Assessments 2,572 2,107 2,248 ATM network charges 3,371 2,996 2,480 Advertising 3,992 2,413 1,981 Professional fees 4,545 3,888 2,707 Telecommunications 3,007 2,870 2,449 Postage 1,296 949 786 Courier service 1,154 1,055 988 Foreclosed assets expense 490 528 514 Intangible amortization 1,157 446 209 Operational losses 737 764 618 Provision for foreclosed asset losses 502 208 682 Change in reserve for unfunded commitments 330 (395 ) (1,200 ) Legal settlement — — 339 Merger expense 586 4,858 312 Other 11,904 10,919 10,144 Total other noninterest expense 59,436 52,835 41,668 Total noninterest expense $ 130,841 $ 110,379 $ 93,604 Merger expense: Incentive compensation — $ 1,174 — Benefits and other compensation costs — 94 — Data processing and software $ 108 475 — Professional fees 120 2,390 $ 312 Other 358 725 — Total merger expense $ 586 $ 4,858 $ 312

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Components of Consolidated Income Tax Expense	The components of consolidated income tax expense are as follows: 2015 2014 2013 (in thousands) Current tax expense Federal $ 21,076 $ 14,485 $ 11,618 State 7,139 5,016 4,261 28,215 19,501 15,879 Deferred tax expense (benefit) Federal 408 (794 ) 1,976 State 273 (199 ) 550 681 (993 ) 2,526 Total tax expense $ 28,896 $ 18,508 $ 18,405
Company's Net Deferred Tax Asset Recorded in Other Assets	The temporary differences, tax effected, which give rise to the Company’s net deferred tax asset recorded in other assets are as follows as of December 31 for the years indicated: 2015 2014 (in thousands) Deferred tax assets: Allowance for losses and reserve for unfunded commitments $ 16,182 $ 16,284 Deferred compensation 2,827 3,115 Accrued pension liability 8,597 7,925 Accrued bonus 1,326 1,149 Other accrued expenses 143 124 Unfunded status of the supplemental retirement plans 2,411 3,315 State taxes 2,297 1,713 Share based compensation 2,701 2,534 Nonaccrual interest 1,979 2,714 OREO write downs 241 198 Acquisition cost basis 5,118 6,017 Tax credits 491 490 Net operating loss carryforwards 5,252 7,128 Other 889 625 Total deferred tax assets 50,454 53,331 Deferred tax liabilities: Securities income (1,362 ) (1,362 ) Unrealized gain on securities (902 ) (1,699 ) Depreciation (2,654 ) (3,072 ) Merger related fixed asset valuations (54 ) (54 ) Securities accretion (485 ) (287 ) Mortgage servicing rights valuation (3,118 ) (2,977 ) Indemnification asset 219 147 Core deposit intangible (2,331 ) (2,802 ) Junior subordinated debt (2,699 ) (2,782 ) Prepaid expenses and other (628 ) (737 ) Total deferred tax liability (14,014 ) (15,625 ) Net deferred tax asset $ 36,440 $ 37,706
Summary of Changes in Unrecognized Tax Benefit (Including Interest and Penalties)	A summary of changes in the Company’s unrecognized tax benefit (including interest and penalties) in 2015 is as follows: (in thousands) UTB Interest/Penalties Total As of December 31, 2014 227 18 245 Lapse of the applicable statute of limitations (59 ) (4 ) (63 ) As of December 31, 2015 168 14 182
Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate	The effective tax rate and the statutory federal income tax rate are reconciled as follows: Years Ended December 31, 2015 2014 2013 Federal statutory income tax rate 35.0 % 35.0 % 35.0 % State income taxes, net of federal tax benefit 6.6 7.0 6.8 Tax-exempt interest on municipal obligations (0.7 ) (0.4 ) (0.4 ) Tax-exempt life insurance related income (1.3 ) (1.5 ) (1.3 ) Non-deductible joint beneficiary agreement expense 0.1 0.2 0.2 Non-deductible merger expense — 1.0 — Other — 0.2 (0.1 ) Effective Tax Rate 39.7 % 41.5 % 40.2 %

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Computation of Earnings Per Share	Earnings per share have been computed based on the following: Years ended December 31, 2015 2014 2013 Net income (in thousands) $ 43,818 $ 26,108 $ 27,399 (number of shares in thousands) Average number of common shares outstanding 22,750 17,716 16,045 Effect of dilutive stock options 248 207 152 Average number of common shares outstanding used to calculate diluted earnings per share 22,998 17,923 16,197

Comprehensive Income (Tables)

Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Components of Other Comprehensive Income and Related Tax Effects	The components of other comprehensive income and related tax effects are as follows: Years Ended December 31, 2015 2014 2013 (in thousands) Unrealized holding losses on available for sale securities before reclassifications $ (1,895 ) $ (162 ) $ (4,232 ) Amounts reclassified out of accumulated other comprehensive income — — — Unrealized holding losses on available for sale securities after reclassifications (1,895 ) (162 ) (4,232 ) Tax effect 797 68 1,780 Unrealized holding losses on available for sale securities, net of tax (1,098 ) (94 ) (2,452 ) Change in unfunded status of the supplemental retirement plans before reclassifications 1,384 (7,253 ) 2,575 Amounts reclassified out of accumulated other comprehensive income: Amortization of prior service cost (57 ) 138 153 Amortization of actuarial losses 823 17 291 Total amounts reclassified out of accumulated other comprehensive income 766 155 444 Change in unfunded status of the supplemental retirement plans after reclassifications 2,150 (7,098 ) 3,019 Tax effect (904 ) 2,984 (1,269 ) Change in unfunded status of the supplemental retirement plans, net of tax 1,246 (4,114 ) 1,750 Change in joint beneficiary agreement liability before reclassifications 277 148 400 Amounts reclassified out of accumulated other comprehensive income — — — Change in joint beneficiary agreement liability after reclassifications 277 148 400 Tax effect — — — Change in joint beneficiary agreement liability, net of tax 277 148 400 Total other comprehensive income (loss) $ 425 $ (4,060 ) $ (302 )
Components of Accumulated Other Comprehensive Income	The components of accumulated other comprehensive income, included in shareholders’ equity, are as follows: December 31, 2015 2014 (in thousands) Net unrealized gains on available for sale securities $ 2,145 $ 4,040 Tax effect (902 ) (1,699 ) Unrealized holding gains on available for sale securities, net of tax 1,243 2,341 Unfunded status of the supplemental retirement plans (5,735 ) (7,885 ) Tax effect 2,411 3,315 Unfunded status of the supplemental retirement plans, net of tax (3,324 ) (4,570 ) Joint beneficiary agreement liability 303 26 Tax effect — — Joint beneficiary agreement liability, net of tax 303 26 Accumulated other comprehensive loss $ (1,778 ) $ (2,203 )

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Pension Plans	Amounts recognized as a component of accumulated other comprehensive loss as of year-end that have not been recognized as a component of the combined net period benefit cost of the Company’s defined benefit pension plans are presented in the following table. The Company expects to recognize approximately $549,000 of the net actuarial loss reported in the following table as of December 31, 2015 as a component of net periodic benefit cost during 2016. December 31, (in thousands) 2015 2014 Transition obligation $ 7 $ 9 Prior service cost (115 ) (173 ) Net actuarial loss 5,843 8,049 Amount included in accumulated other comprehensive loss 5,735 7,885 Deferred tax benefit (2,411 ) (3,315 ) Amount included in accumulated other comprehensive loss, net of tax $ 3,324 $ 4,570
Information Pertaining to Activity in Supplemental Retirement Plans	Information pertaining to the activity in the supplemental retirement plans, using a measurement date of December 31, is as follows: December 31, 2015 2014 (in thousands) Change in benefit obligation: Benefit obligation at beginning of year $ (26,798 ) $ (14,634 ) Acquisition — (4,150 ) Service cost (1,023 ) (652 ) Interest cost (957 ) (739 ) Actuarial (loss)/gain 1,382 (7,254 ) Benefits paid 1,212 631 Benefit obligation at end of year $ (26,184 ) $ (26,798 ) Change in plan assets: Fair value of plan assets at beginning of year $ — $ — Fair value of plan assets at end of year $ — $ — Funded status $ (26,184 ) $ (26,798 ) Unrecognized net obligation existing at January 1, 1986 7 9 Unrecognized net actuarial loss 5,843 8,049 Unrecognized prior service cost (115 ) (173 ) Accumulated other comprehensive income (5,735 ) (7,885 ) Accrued benefit cost $ (26,184 ) $ (26,798 ) Accumulated benefit obligation $ (24,469 ) $ (24,739 )
Net Periodic Benefit Cost Recognized for Supplemental Retirement Plans	The following table sets forth the net periodic benefit cost recognized for the supplemental retirement plans: Years Ended December 31, 2015 2014 2013 (in thousands) Net pension cost included the following components: Service cost-benefits earned during the period $ 1,023 $ 652 $ 743 Interest cost on projected benefit obligation 957 739 643 Amortization of net obligation at transition 2 2 2 Amortization of prior service cost (57 ) 138 153 Recognized net actuarial loss 823 16 291 Net periodic pension cost $ 2,748 $ 1,547 $ 1,832
Assumptions Used in Accounting for Plans	The following table sets forth assumptions used in accounting for the plans: Years Ended December 31, 2015 2014 2013 Discount rate used to calculate benefit obligation 4.00 % 3.65 % 4.85 % Discount rate used to calculate net periodic pension cost 4.00 % 3.65 % 4.85 % Average annual increase in executive compensation 2.50 % 2.50 % 2.50 % Average annual increase in director compensation 2.50 % 2.50 % 2.50 %
Expected Benefit Payments to Participants and Estimated Contributions to be Made by Company	The following table sets forth the expected benefit payments to participants and estimated contributions to be made by the Company under the supplemental retirement plans for the years indicated: Years Ended Expected Benefit Estimated (in thousands) 2016 $ 1,104 $ 1,104 2017 983 983 2018 974 974 2019 845 845 2020 731 731 2021-2025 $ 3,490 $ 3,490

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Summary of Activity in Lending Transactions	The following table summarizes the activity in these loans for the periods indicated (in thousands): Balance December 31, 2013 $ 2,636 Advances/new loans 2,106 Removed/payments (1,610 ) Balance December 31, 2014 3,132 Advances/new loans 3,098 Removed/payments (2,029 ) Balance December 31, 2015 $ 4,201

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis	The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis (in thousands): Total Level 1 Level 2 Level 3 Fair value at December 31, 2015 Securities available-for-sale: Obligations of U.S. government corporations and agencies $ 313,682 — $ 313,682 — Obligations of states and political subdivisions 88,218 — 88,218 — Corporate debt securities — — — — Marketable equity securities 2,985 $ 2,985 — — Mortgage servicing rights 7,618 — — $ 7,618 Total assets measured at fair value $ 412,503 $ 2,985 $ 401,900 $ 7,618 Total Level 1 Level 2 Level 3 Fair value at December 31, 2014 Securities available-for-sale: Obligations of U.S. government corporations and agencies $ 75,120 — $ 75,120 — Obligations of states and political subdivisions 3,175 — 3,175 — Corporate debt securities 1,908 — 1,908 — Marketable equity securities 3,002 $ 3,002 — — Mortgage servicing rights 7,378 — — $ 7,378 Total assets measured at fair value $ 90,583 $ 3,002 $ 80,203 $ 7,378
Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis	The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the years ended December 31, 2015 and 2014. Had there been any transfer into or out of Level 3 during 2015 or 2014, the amount included in the “Transfers into (out of) Level 3” column would represent the beginning balance of an item in the period (interim quarter) during which it was transferred (in thousands): Ending Transfers Change Issuances Beginning Year ended December 31, 2015: Mortgage servicing rights $ 7,618 — $ (701 ) $ 941 $ 7,378 2014: Mortgage servicing rights $ 7,378 $ 1,944 $ (1,301 ) $ 570 $ 6,165
Quantitative Information about Recurring Level 3 Fair Value Measurements	The following table presents quantitative information about recurring Level 3 fair value measurements at December 31, 2015: Fair Value Valuation Technique Unobservable Inputs Range, Weighted Average Mortgage Servicing Rights $ 7,618 Discounted cash flow Constant prepayment rate Discount rate 6.3%-20.5%, 9.8% 10.0%-12.0%, 10.0%
Assets and Liabilities Measured at Fair Value on Nonrecurring Basis	The tables below present the recorded amount of assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated, that had a write-down or an additional allowance provided during the periods indicated (in thousands): Total Level 1 Level 2 Level 3 Total Gains Year ended December 31, 2015 Fair value: Impaired Originated & PNCI loans $ 4,649 — — $ 4,649 $ (663 ) Foreclosed assets 1,839 1,839 (418 ) Total assets measured at fair value $ 6,488 — — $ 6,488 $ (1,081 ) Total Level 1 Level 2 Level 3 Total Gains (Losses) Year ended December 31, 2014 Fair value: Impaired Originated & PNCI loans $ 2,480 — — $ 2,480 $ (636 ) Foreclosed assets 2,611 — — 2,611 $ (137 ) Total assets measured at fair value $ 5,091 — — $ 5,091 $ (773 )
Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis	The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at December 31, 2015: Fair Value Valuation Technique Unobservable Inputs Range, Impaired Originated & PNCI loans $ 4,649 Sales comparison approach Income approach Adjustment for differences between comparable sales Capitalization rate (5.0)%-(5.0)%, (5.0)% Foreclosed assets (Land & construction) $ 201 Sales comparison approach Adjustment for differences between comparable sales (5.0)%-(7.0)%, (5.59)% Foreclosed assets (residential (Residential real estate) $ 814 Sales comparison approach Adjustment for differences between comparable sales (5.0)%-(8.0)%, (6.04)% Foreclosed assets (Commercial real estate) $ 824 Sales comparison approach Adjustment for differences between comparable sales (7.0)%-(9.0)%, (7.50)%
Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets	The estimated fair values of financial instruments that are reported at amortized cost in the Corporation’s consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows (in thousands): December 31, 2015 December 31, 2014 Carrying Fair Carrying Fair Financial assets: Level 1 inputs: Cash and due from banks $ 94,305 $ 94,305 $ 93,150 $ 93,150 Cash at Federal Reserve and other banks 209,156 209,156 517,578 517,578 Level 2 inputs: Securities held to maturity 726,530 732,208 676,426 688,779 Restricted equity securities 16,596 N/A 16,956 N/A Loans held for sale 1,873 1,873 3,579 3,579 Level 3 inputs: Loans, net 2,486,926 2,555,297 2,282,524 2,379,155 Financial liabilities: Level 2 inputs: Deposits 3,631,266 3,630,129 3,380,423 3,380,486 Other borrowings 12,328 12,328 9,276 9,276 Level 3 inputs: Junior subordinated debt $ 56,470 $ 44,527 $ 56,272 $ 45,053 Contract Fair Contract Fair Off-balance sheet: Level 3 inputs: Commitments $ 705,316 $ 7,053 $ 656,175 $ 6,562 Standby letters of credit $ 8,330 $ 83 $ 17,531 $ 175 Overdraft privilege commitments $ 94,473 $ 945 $ 101,060 $ 1,011

TriCo Bancshares Condensed Fi65

TriCo Bancshares Condensed Financial Statements (Parent Only) (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	Condensed Balance Sheets December 31, 2015 2014 (in thousands) Assets Cash and Cash equivalents $ 2,565 $ 2,229 Investment in Tri Counties Bank 504,655 470,797 Other assets 1,714 1,902 Total assets $ 508,934 $ 474,928 Liabilities and shareholders’ equity Other liabilities $ 348 $ 484 Junior subordinated debt 56,470 56,272 Total liabilities 56,818 56,756 Shareholders’ equity: Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 22,775,173 and 22,714,964 shares, respectively 247,587 244,318 Retained earnings 206,307 176,057 Accumulated other comprehensive loss, net (1,778 ) (2,203 ) Total shareholders’ equity 452,116 418,172 Total liabilities and shareholders’ equity $ 508,934 $ 474,928
Condensed Statements of Income	Condensed Statements of Income Years ended December 31, 2015 2014 2013 (in thousands) Interest expense $ (1,977 ) $ (1,403 ) $ (1,247 ) Administration expense (814 ) (2,720 ) (862 ) Loss before equity in net income of Tri Counties Bank (2,791 ) (4,123 ) (2,109 ) Equity in net income of Tri Counties Bank: Distributed 13,304 8,270 8,175 Undistributed 32,131 20,720 20,446 Income tax benefit 1,174 1,241 887 Net income $ 43,818 $ 26,108 $ 27,399
Condensed Statements of Comprehensive Income	Condensed Statements of Comprehensive Income Years ended December 31, 2015 2014 2013 (in thousands) Net income $ 43,818 $ 26,108 $ 27,399 Other comprehensive (loss) income, net of tax: Unrealized holding (losses) gains on securities arising during the period (1,098 ) (94 ) (2,452 ) Change in minimum pension liability 1,246 (4,114 ) 1,750 Change in joint beneficiary agreement liability 277 148 400 Other comprehensive (loss) income 425 (4,060 ) (302 ) Net income $ 44,243 $ 22,048 $ 27,097
Condensed Statements of Cash Flows	Condensed Statements of Cash Flows Years ended December 31, 2015 2014 2013 (in thousands) Operating activities: Net income $ 43,818 $ 26,108 $ 27,399 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed equity in earnings of Tri Counties Bank (32,131 ) (20,720 ) (20,446 ) Equity compensation vesting expense 1,370 1,133 1,151 Equity compensation tax effect 68 (225 ) (356 ) Net change in other assets and liabilities (1,120 ) 671 (1,100 ) Net cash provided by operating activities 12,005 6,967 6,648 Investing activities: None Financing activities: Issuance of common stock through option exercise 660 616 251 Equity compensation tax effect (68 ) 225 356 Repurchase of common stock (412 ) (292 ) (501 ) Cash dividends paid — common (11,849 ) (7,807 ) (6,745 ) Net cash used for financing activities (11,669 ) (7,258 ) (6,639 ) (decrease) increase in cash and cash equivalents 336 (291 ) 9 Cash and cash equivalents at beginning of year 2,229 2,520 2,511 Cash and cash equivalents at end of year $ 2,565 $ 2,229 $ 2,520

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Actual and Required Capital Ratios of Bank	The following table presents actual and required capital ratios as of December 31, 2015 for the Company and the Bank under Basel III Capital Rules. The minimum capital amounts presented include the minimum required capital levels as of December 31, 2015 based on the phased-in provisions of the Basel III Capital Rules and the minimum required capital levels as of January 1, 2019 when the Basel III Capital Rules have been fully phased-in. Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. Actual Minimum Capital Minimum Capital Required to be Amount Ratio Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of December 31, 2015: Total Capital (to Risk Weighted Assets): Consolidated $ 474,436 15.09 % $ 251,555 8.00 % $ 330,165 10.50 % N/A N/A Tri Counties Bank $ 473,327 15.06 % $ 251,418 8.00 % $ 329,985 10.50 % $ 314,272 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 435,950 13.86 % $ 188,666 6.00 % $ 267,277 8.50 % N/A N/A Tri Counties Bank $ 434,841 13.84 % $ 188,563 6.00 % $ 267,131 8.50 % $ 251,418 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 385,747 12.27 % $ 141,499 4.50 % $ 220,110 7.00 % N/A N/A Tri Counties Bank $ 434,841 13.84 % $ 141,422 4.50 % $ 219,990 7.00 % $ 204,277 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 435,950 10.79 % $ 161,562 4.00 % $ 161,562 4.00 % N/A N/A Tri Counties Bank $ 434,841 10.76 % $ 161,601 4.00 % $ 161,601 4.00 % $ 202,002 5.00 % The following table presents actual and required capital ratios as of December 31, 2104 for the Company and the Bank under the regulatory capital rules then in effect. Actual Minimum Minimum Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of December 31, 2014: Total Capital (to Risk Weighted Assets): Consolidated $ 436,955 15.63 % $ 223,603 8.0 % N/A N/A Tri Counties Bank $ 433,286 15.51 % $ 223,449 8.0 % $ 279,311 10.0 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 401,971 14.38 % $ 111,801 4.0 % N/A N/A Tri Counties Bank $ 398,325 14.26 % $ 111,724 4.0 % $ 167,587 6.0 % Tier 1 Capital (to Average Assets): Consolidated $ 401,971 10.80 % $ 148,819 4.0 % N/A N/A Tri Counties Bank $ 398,325 10.71 % $ 148,734 4.0 % $ 185,918 5.0 %

Summary of Quarterly Results 67

Summary of Quarterly Results of Operations (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Results of Operations	The following table sets forth the results of operations for the four quarters of 2015 and 2014, and is unaudited; however, in the opinion of Management, it reflects all adjustments (which include only normal recurring adjustments) necessary to present fairly the summarized results for such periods. 2015 Quarters Ended December 31, September 30, June 30, March 31, (dollars in thousands, except per share data) Interest and dividend income: Loans: Discount accretion PCI – cash basis $ 302 $ 445 $ 404 $ 172 Discount accretion PCI – other 1,392 1,090 907 1,274 Discount accretion PNCI 573 1,590 822 1,348 All other loan interest income 32,571 30,689 29,886 28,371 Total loan interest income 34,838 33,814 32,019 31,165 Debt securities, dividends and interest bearing cash at banks (not FTE) 7,652 7,518 7,848 6,560 Total interest income 42,490 41,332 39,867 37,725 Interest expense 1,349 1,339 1,346 1,382 Net interest income 41,141 39,993 38,521 36,343 (Benefit from) provision for loan losses (908 ) (866 ) (633 ) 197 Net interest income after provision for loan losses 42,049 40,859 39,154 36,146 Noninterest income 11,445 11,642 12,080 10,180 Noninterest expense 34,684 31,439 32,436 32,282 Income before income taxes 18,810 21,062 18,798 14,044 Income tax expense 7,388 8,368 7,432 5,708 Net income $ 11,422 $ 12,694 $ 11,366 $ 8,336 Per common share: Net income (diluted) $ 0.50 $ 0.55 $ 0.49 $ 0.36 Dividends $ 0.15 $ 0.13 $ 0.13 $ 0.11 2014 Quarters Ended December 31, September 30, June 30, March 31, (dollars in thousands, except per share data) Interest and dividend income: Loans: Discount accretion PCI – cash basis $ 107 $ 290 $ 69 $ 203 Discount accretion PCI – other 919 822 811 984 Discount accretion PNCI 796 402 624 379 All other loan interest income 28,914 23,466 22,929 22,172 Total loan interest income 30,736 24,980 24,433 23,738 Debt securities, dividends and interest bearing cash at banks (not FTE) 5,671 4,151 3,985 3,421 Total interest income 36,407 29,131 28,418 27,159 Interest expense 1,437 1,082 1,075 1,087 Net interest income 34,970 28,049 27,343 26,072 (Benefit from) provision for loan losses (1,421 ) (2,977 ) 1,708 (1,355 ) Net interest income after provision for loan losses 36,391 31,026 25,635 27,427 Noninterest income 9,755 8,589 7,877 8,295 Noninterest expense 36,566 25,380 25,116 23,317 Income before income taxes 9,580 14,235 8,396 12,405 Income tax expense 3,930 6,001 3,537 5,040 Net income $ 5,650 $ 8,234 $ 4,859 $ 7,365 Per common share: Net income (diluted) $ 0.25 $ 0.50 $ 0.30 $ 0.45 Dividends $ 0.11 $ 0.11 $ 0.11 $ 0.11

Summary of Significant Accoun68

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)BranchesSegmentTrustLocationBusiness	Dec. 31, 2014USD ($)	Jun. 30, 2014USD ($)
Significant Of Accounting Policies [Line Items]
Number of subsidiary business trusts | Trust		5
Company's investments in the trusts		$ 1,696,000
Number of business segment | Segment		1
Trading securities		$ 0	$ 0
Recognized OTTI losses		$ 0	$ 0
Loans contractual past due		90 days
TDR loans payment period in nonaccrual status		6 months
Reserve for unimpaired loans				$ 1,438,000
Tri Counties Bank [Member]
Significant Of Accounting Policies [Line Items]
Number of locations acquired | Location		3
Number of traditional operating branches | Branches		55
Number of in-store operating branches | Branches		12
California [Member]
Significant Of Accounting Policies [Line Items]
Number of counties | Business		26
Home Equity Lines of Credit [Member]
Significant Of Accounting Policies [Line Items]
Increase in allowance for loan losses due to change in methodology	$ 859,000
Home Equity Loans [Member]
Significant Of Accounting Policies [Line Items]
Increase in allowance for loan losses due to change in methodology	$ 459,000
Furniture and equipment [Member] | Minimum [Member]
Significant Of Accounting Policies [Line Items]
Estimated useful lives of the related assets or lease terms		3 years
Furniture and equipment [Member] | Maximum [Member]
Significant Of Accounting Policies [Line Items]
Estimated useful lives of the related assets or lease terms		10 years
Land improvements and buildings [Member] | Minimum [Member]
Significant Of Accounting Policies [Line Items]
Estimated useful lives of the related assets or lease terms		15 years
Land improvements and buildings [Member] | Maximum [Member]
Significant Of Accounting Policies [Line Items]
Estimated useful lives of the related assets or lease terms		40 years

Business Combinations - Additio

Business Combinations - Additional Information (Detail)	Oct. 28, 2015USD ($)Branches	Oct. 03, 2014USD ($)$ / sharesshares	Jun. 30, 2014USD ($)Bank	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)shares	Aug. 21, 2007shares
Business Acquisition [Line Items]
Business acquisition, common stock issued to acquiree's shareholders | shares		6,575,550
Fixed share exchange ratio		0.9433
Aggregate ownership percentage		28.90%
Cash in-lieu of fractional shares		$ 6,823
Business combination share outstanding | shares				22,775,173	22,714,964	15,814,662
Assets				$ 4,220,722,000	$ 3,916,458,000
Bank Of America [Member]
Business Acquisition [Line Items]
Number of branches | Branches	3
Loans	$ 400,000
Deposits	$ 235,000,000
Percentage of premium on deposits	1.91%
North Valley Bancorp [Member]
Business Acquisition [Line Items]
Loans		499,327,000
Deposits		$ 801,956,000
Acquisition, completion date				Oct. 3, 2014
Closing stock price | $ / shares		$ 23.01
Consideration paid per share | $ / shares		$ 21.71
Cash in-lieu of fractional shares		$ 7,000
Business combination share outstanding | shares		22,714,964
Business combination consideration value		$ 151,310,000
Number of commercial banks | Bank			22
Assets			$ 935,000,000
Increase in net book value of land and buildings acquired		4,785,000
Recognized intangible related to acquisition		6,614,000
North Valley Bancorp [Member] | Junior subordinated debt [Member]
Business Acquisition [Line Items]
Discount on debt instrument		$ 6,664,000
North Valley Bancorp [Member] | Minimum [Member] | Junior subordinated debt [Member]
Business Acquisition [Line Items]
Amortization period of debt discount		18 years
North Valley Bancorp [Member] | Maximum [Member] | Junior subordinated debt [Member]
Business Acquisition [Line Items]
Amortization period of debt discount		21 years
North Valley Bancorp [Member] | Core deposit intangibles [Member]
Business Acquisition [Line Items]
Recognized intangible related to acquisition		$ 6,614,000
Percentage of acquired intangibles		0.97%
Finite lived intangible asset useful life		7 years

Business Combinations - Schedul

Business Combinations - Schedule of Fair Value of Consideration Transferred, Identifiable Net Assets Acquired and Resulting Goodwill (Detail) - USD ($)	Oct. 03, 2014	Dec. 31, 2015	Dec. 31, 2014
Fair value of consideration transferred:
Cash consideration	$ 6,823
Liabilities assumed:
Goodwill recognized		$ 63,462,000	$ 63,462,000
North Valley Bancorp [Member]
Fair value of consideration transferred:
Fair value of shares issued	151,303,000
Cash consideration	7,000
Total fair value of consideration transferred	151,310,000
Asset acquired:
Cash and cash equivalents	141,412,000
Securities available for sale	17,288,000
Securities held to maturity	189,950,000
Restricted equity securities	5,378,000
Loans	499,327,000
Foreclosed assets	695,000
Premises and equipment	11,936,000
Cash value of life insurance	38,075,000
Core deposit intangible	6,614,000
Other assets	20,064,000
Total assets acquired	930,739,000
Liabilities assumed:
Deposits	801,956,000
Other liabilities	10,429,000
Junior subordinated debt	14,987,000
Total liabilities assumed	827,372,000
Total net assets acquired	103,367,000
Goodwill recognized	$ 47,943,000

Business Combinations - Summary

Business Combinations - Summary of Estimated Fair Value Adjustments Resulting In Goodwill (Detail) - USD ($)	Oct. 03, 2014	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Cash payments to North Valley Bancorp Shareholders	$ 6,823
Goodwill		$ 63,462,000	$ 63,462,000
North Valley Bancorp [Member]
Business Acquisition [Line Items]
Value of stock consideration paid to North Valley Bancorp Shareholders	151,303,000
Cash payments to North Valley Bancorp Shareholders	7,000
Cost basis net assets acquired	(98,040,000)
Other	280,000
Goodwill	47,943,000
North Valley Bancorp [Member] | Deferred income taxes [Member]
Business Acquisition [Line Items]
Fair Value Adjustments	6,293,000
North Valley Bancorp [Member] | Loans [Member]
Business Acquisition [Line Items]
Fair Value Adjustments	5,832,000
North Valley Bancorp [Member] | Premises and equipment [Member]
Business Acquisition [Line Items]
Fair Value Adjustments	(4,785,000)
North Valley Bancorp [Member] | Core deposit intangibles [Member]
Business Acquisition [Line Items]
Fair Value Adjustments	(6,283,000)
North Valley Bancorp [Member] | Junior subordinated debt [Member]
Business Acquisition [Line Items]
Fair Value Adjustments	$ (6,664,000)

Business Combinations - Sched72

Business Combinations - Schedule of Cost Basis, Fair Value Discount and Loan Acquired (Detail) - North Valley Bancorp [Member] $ in Thousands	Oct. 03, 2014USD ($)
Business Acquisition [Line Items]
Cost Basis	$ 514,125
Discount	(14,798)
Fair Value	499,327
PNCI [Member]
Business Acquisition [Line Items]
Cost Basis	502,637
Discount	(12,721)
Fair Value	489,916
PCI - Other [Member]
Business Acquisition [Line Items]
Cost Basis	11,488
Discount	(2,077)
Fair Value	$ 9,411

Business Combinations - Summa73

Business Combinations - Summary of Principal Balance Loans Acquired (Detail) - North Valley Bancorp [Member] $ in Thousands	Oct. 03, 2014USD ($)
Business Acquisition [Line Items]
Undiscounted contractual cash flows	$ 734,437
Undiscounted cash flows not expected to be collected (nonaccretable difference)	(6,295)
Undiscounted cash flows expected to be collected	728,142
Accretable yield at acquisition	(228,815)
Estimated fair value of loans acquired at acquisition	499,327
Purchase discount	14,798
Cost Basis	514,125
PNCI [Member]
Business Acquisition [Line Items]
Undiscounted contractual cash flows	718,731
Undiscounted cash flows expected to be collected	718,731
Accretable yield at acquisition	(228,815)
Estimated fair value of loans acquired at acquisition	489,916
Purchase discount	12,721
Cost Basis	502,637
PCI - Other [Member]
Business Acquisition [Line Items]
Undiscounted contractual cash flows	15,706
Undiscounted cash flows not expected to be collected (nonaccretable difference)	(6,295)
Undiscounted cash flows expected to be collected	9,411
Estimated fair value of loans acquired at acquisition	9,411
Purchase discount	2,077
Cost Basis	$ 11,488

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Values of Investments in Debt and Equity Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 402,740	$ 79,165
Gross Unrealized Gains	4,189	4,065
Gross Unrealized Losses	(2,044)	(25)
Estimated Fair Value	404,885	83,205
Amortized Cost, Held to Maturity	726,530	676,426
Gross Unrealized Gains, Held to Maturity	8,671	13,185
Gross Unrealized Losses, Held to Maturity	(2,992)	(832)
Estimated Fair Value, Held to Maturity	732,209	688,779
Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	312,917	71,144
Gross Unrealized Gains	2,761	4,001
Gross Unrealized Losses	(1,996)	(25)
Estimated Fair Value	313,682	75,120
Amortized Cost, Held to Maturity	711,994	660,836
Gross Unrealized Gains, Held to Maturity	8,394	13,055
Gross Unrealized Losses, Held to Maturity	(2,882)	(677)
Estimated Fair Value, Held to Maturity	717,506	673,214
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	86,823	3,130
Gross Unrealized Gains	1,428	45
Gross Unrealized Losses	(33)
Estimated Fair Value	88,218	3,175
Amortized Cost, Held to Maturity	14,536	15,590
Gross Unrealized Gains, Held to Maturity	277	130
Gross Unrealized Losses, Held to Maturity	(110)	(155)
Estimated Fair Value, Held to Maturity	14,703	15,565
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,891
Gross Unrealized Gains		17
Estimated Fair Value		1,908
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,000	3,000
Gross Unrealized Gains		2
Gross Unrealized Losses	(15)
Estimated Fair Value	$ 2,985	$ 3,002

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)Investmentsecurities	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Investment Securities [Line Items]
Investment securities sold	$ 2,000	$ 14,130,000	$ 0
Gain or loss on sale of investment securities	0
Investment securities carrying value	297,547,000	$ 143,992,000
Mortgage-backed securities	$ 1,024,911,000
Life of mortgage-backed securities	5 years 10 months 24 days
Obligations of U.S. Government Corporations and Agencies [Member]
Investment Securities [Line Items]
Debt securities | Investmentsecurities	29
Percentage of aggregate depreciation in unrealized losses	1.23%
Obligations of States and Political Subdivisions [Member]
Investment Securities [Line Items]
Debt securities | Investmentsecurities	10
Percentage of aggregate depreciation in unrealized losses	1.73%
Marketable Equity Securities [Member]
Investment Securities [Line Items]
Percentage of aggregate depreciation in unrealized losses	0.05%

Investment Securities - Amort76

Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Due in one year, Amortized Cost	$ 0
Due after one year through five years, Amortized Cost	8,870
Due after five years through ten years, Amortized Cost	24,150
Due after ten years, Amortized Cost	369,720
Totals, Amortized Cost	402,740
Due in one year, Estimated Fair Value	0
Due after one year through five years, Estimated Fair Value	9,112
Due after five years through ten years, Estimated Fair Value	25,204
Due after ten years, Estimated Fair Value	370,569
Totals, Estimated Fair Value	404,885
Due in one year, Amortized Cost, Held to Maturity	0
Due after one year through five years, Amortized Cost, Held to Maturity	1,147
Due after five years through ten years, Amortized Cost, Held to Maturity	830
Due after ten years, Amortized Cost, Held to Maturity	724,553
Totals, Amortized Cost, Held to Maturity	726,530	$ 676,426
Due in one year, Estimated Fair Value, Held to Maturity	0
Due after one year through five years, Estimated Fair Value, Held to Maturity	1,158
Due after five years through ten years, Estimated Fair Value, Held to Maturity	870
Due after ten years, Estimated Fair Value, Held to Maturity	730,181
Estimated Fair Value, Held to Maturity	$ 732,209	$ 688,779

Investment Securities - Gross U

Investment Securities - Gross Unrealized Losses on Investment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 202,760	$ 6,774
Less than 12 months, Unrealized Loss	(2,044)	(25)
12 months or more, Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Fair Value	202,760	6,774
Total Unrealized Loss	(2,044)	(25)
Less than 12 months, Fair Value, held to maturity	198,978	1,935
Less than 12 months, Unrealized Loss, held to maturity	(2,893)	(27)
12 months or more, Fair Value, held to maturity	1,121	58,146
12 months or more, Unrealized Loss, held to maturity	(99)	(805)
Total Fair Value, held to maturity	200,099	60,081
Total Unrealized Loss, held to maturity	(2,992)	(832)
Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	193,306	6,774
Less than 12 months, Unrealized Loss	(1,996)	(25)
12 months or more, Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Fair Value	193,306	6,774
Total Unrealized Loss	(1,996)	(25)
Less than 12 months, Fair Value, held to maturity	198,481	335
Less than 12 months, Unrealized Loss, held to maturity	(2,882)	(1)
12 months or more, Fair Value, held to maturity		56,288
12 months or more, Unrealized Loss, held to maturity		(676)
Total Fair Value, held to maturity	198,481	56,623
Total Unrealized Loss, held to maturity	(2,882)	(677)
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	6,469
Less than 12 months, Unrealized Loss	(33)
12 months or more, Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Fair Value	6,469
Total Unrealized Loss	(33)
Less than 12 months, Fair Value, held to maturity	497	1,600
Less than 12 months, Unrealized Loss, held to maturity	(11)	(26)
12 months or more, Fair Value, held to maturity	1,121	1,858
12 months or more, Unrealized Loss, held to maturity	(99)	(129)
Total Fair Value, held to maturity	1,618	3,458
Total Unrealized Loss, held to maturity	(110)	(155)
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	2,985
Less than 12 months, Unrealized Loss	(15)
12 months or more, Fair Value	0	0
12 months or more, Unrealized Loss	0	$ 0
Total Fair Value	2,985
Total Unrealized Loss	$ (15)

Loans - Summary of Loan Balance

Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Mortgage loans on real estate:
Total mortgage loan on real estate	$ 1,811,832	$ 1,615,359
Consumer:
Total consumer loans	395,283	417,084
Commercial	194,913	174,945
Construction:
Total construction	120,909	75,136
Total loans, net of deferred loan fees and discounts	2,522,937	2,282,524	$ 1,672,007
Total principal balance of loans owed, net of charge-offs	2,555,610	2,322,853
Unamortized net deferred loan fees	(6,551)	(4,793)
Discounts to principal balance of loans owed, net of charge-offs	(26,122)	(35,536)
Total loans, net of unamortized deferred loan fees and discounts	2,522,937	2,282,524	1,672,007
Noncovered loans	2,517,702	2,260,256
Covered loans	5,235	22,268
Total loans, net of unamortized deferred loan fees and discounts	2,522,937	2,282,524	1,672,007
Allowance for loan losses	36,011	36,585	38,245	$ 42,648
Residential 1-4 family [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	314,265	279,420
Home Equity Loans [Member]
Consumer:
Total consumer loans	40,362	31,314
Construction:
Total loans, net of deferred loan fees and discounts	40,362	31,314	14,588
Total loans, net of unamortized deferred loan fees and discounts	40,362	31,314	14,588
Total loans, net of unamortized deferred loan fees and discounts	40,362	31,314	14,588
Allowance for loan losses	3,138	1,797	1,208	1,155
Auto Indirect [Member]
Consumer:
Total consumer loans		112
Construction:
Total loans, net of deferred loan fees and discounts		112	946
Total loans, net of unamortized deferred loan fees and discounts		112	946
Total loans, net of unamortized deferred loan fees and discounts		112	946
Allowance for loan losses		9	66	243
Other [Member]
Consumer:
Total consumer loans	32,429	33,074
Commercial [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	1,497,567	1,335,939
Construction:
Total construction	74,774	36,518
Home Equity Lines of Credit [Member]
Consumer:
Total consumer loans	322,492	352,584
Construction:
Total loans, net of deferred loan fees and discounts	322,492	352,584	339,866
Total loans, net of unamortized deferred loan fees and discounts	322,492	352,584	339,866
Total loans, net of unamortized deferred loan fees and discounts	322,492	352,584	339,866
Allowance for loan losses	11,253	15,676	$ 16,375	$ 21,367
Residential [Member]
Construction:
Total construction	46,135	38,618
Originated [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	1,371,228	1,083,391
Consumer:
Total consumer loans	349,134	357,067
Commercial	170,320	126,611
Construction:
Total construction	98,063	45,680
Total loans, net of deferred loan fees and discounts	1,988,745	1,612,749
Total principal balance of loans owed, net of charge-offs	1,995,296	1,617,542
Unamortized net deferred loan fees	(6,551)	(4,793)
Total loans, net of unamortized deferred loan fees and discounts	1,988,745	1,612,749
Noncovered loans	1,988,745	1,612,749
Total loans, net of unamortized deferred loan fees and discounts	1,988,745	1,612,749
Allowance for loan losses	31,271	29,860
Originated [Member] | Residential 1-4 family [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	207,585	154,594
Originated [Member] | Home Equity Loans [Member]
Consumer:
Total consumer loans	34,717	23,559
Originated [Member] | Auto Indirect [Member]
Consumer:
Total consumer loans		112
Originated [Member] | Other [Member]
Consumer:
Total consumer loans	28,998	28,230
Originated [Member] | Commercial [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	1,163,643	928,797
Construction:
Total construction	66,285	24,545
Originated [Member] | Home Equity Lines of Credit [Member]
Consumer:
Total consumer loans	285,419	305,166
Originated [Member] | Residential [Member]
Construction:
Total construction	31,778	21,135
PNCI [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	415,399	497,046
Consumer:
Total consumer loans	36,720	50,152
Commercial	19,744	40,899
Construction:
Total construction	22,125	28,781
Total loans, net of deferred loan fees and discounts	493,988	616,878
Total principal balance of loans owed, net of charge-offs	507,935	634,490
Discounts to principal balance of loans owed, net of charge-offs	(13,947)	(17,612)
Total loans, net of unamortized deferred loan fees and discounts	493,988	616,878
Noncovered loans	493,988	616,878
Total loans, net of unamortized deferred loan fees and discounts	493,988	616,878
Allowance for loan losses	1,848	3,296
PNCI [Member] | Residential 1-4 family [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	104,535	120,821
PNCI [Member] | Home Equity Loans [Member]
Consumer:
Total consumer loans	4,018	6,985
PNCI [Member] | Other [Member]
Consumer:
Total consumer loans	3,367	4,770
PNCI [Member] | Commercial [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	310,864	376,225
Construction:
Total construction	8,489	11,973
PNCI [Member] | Home Equity Lines of Credit [Member]
Consumer:
Total consumer loans	29,335	38,397
PNCI [Member] | Residential [Member]
Construction:
Total construction	13,636	16,808
PCI - Cash basis [Member]
Consumer:
Total consumer loans	5,078	5,603
Commercial	1	8
Construction:
Total loans, net of deferred loan fees and discounts	5,079	5,611
Total principal balance of loans owed, net of charge-offs	12,686	14,805
Discounts to principal balance of loans owed, net of charge-offs	(7,607)	(9,194)
Total loans, net of unamortized deferred loan fees and discounts	5,079	5,611
Noncovered loans	5,079	5,611
Total loans, net of unamortized deferred loan fees and discounts	5,079	5,611
Allowance for loan losses	121	348
PCI - Cash basis [Member] | Home Equity Loans [Member]
Consumer:
Total consumer loans	124	125
PCI - Cash basis [Member] | Home Equity Lines of Credit [Member]
Consumer:
Total consumer loans	4,954	5,478
PCI - Other [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	25,205	34,922
Consumer:
Total consumer loans	4,351	4,262
Commercial	4,848	7,427
Construction:
Total construction	721	675
Total loans, net of deferred loan fees and discounts	35,125	47,286
Total principal balance of loans owed, net of charge-offs	39,693	56,016
Discounts to principal balance of loans owed, net of charge-offs	(4,568)	(8,730)
Total loans, net of unamortized deferred loan fees and discounts	35,125	47,286
Noncovered loans	29,890	25,018
Covered loans	5,235	22,268
Total loans, net of unamortized deferred loan fees and discounts	35,125	47,286
Allowance for loan losses	2,771	3,081
PCI - Other [Member] | Residential 1-4 family [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	2,145	4,005
PCI - Other [Member] | Home Equity Loans [Member]
Consumer:
Total consumer loans	1,503	645
PCI - Other [Member] | Other [Member]
Consumer:
Total consumer loans	64	74
PCI - Other [Member] | Commercial [Member]
Mortgage loans on real estate:
Total mortgage loan on real estate	23,060	30,917
PCI - Other [Member] | Home Equity Lines of Credit [Member]
Consumer:
Total consumer loans	2,784	3,543
PCI - Other [Member] | Residential [Member]
Construction:
Total construction	$ 721	$ 675

Loans - Change in Accretable Yi

Loans - Change in Accretable Yield for PCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Change in accretable yield:
Balance at beginning of period	$ 14,159	$ 18,233
Accretion to interest income	(6,323)	(5,854)
Reclassification (to) from nonaccretable difference	5,419	1,780
Balance at end of period	$ 13,255	$ 14,159

Allowance for Loan Losses - Sum

Allowance for Loan Losses - Summary of Activity in Allowance for Loan Losses, and Ending Balance of Loans, Net of Unearned Fees for Periods Indicated (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 2,522,937	$ 2,282,524	$ 1,672,007
Individ. evaluated for impairment	50,105	62,247	81,235
Loans pooled for evaluation	2,432,628	2,167,381	1,537,060
Loans acquired with deteriorated credit quality	40,204	52,897	53,712
Beginning balance	36,585	38,245	42,648
Charge-offs	(2,816)	(2,558)	(7,543)
Recoveries	4,452	4,943	3,855
(Benefit) provision	(2,210)	(4,045)	(715)
Ending balance	36,011	36,585	38,245
Ending balance:
Individ. evaluated for impairment	2,890	4,267	3,975
Loans pooled for evaluation	30,228	28,891	30,230
Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	322,492	352,584	339,866
Individ. evaluated for impairment	5,747	6,968	6,918
Loans pooled for evaluation	309,007	336,595	322,865
Loans acquired with deteriorated credit quality	7,738	9,021	10,083
Beginning balance	15,676	16,375	21,367
Charge-offs	(694)	(1,094)	(2,651)
Recoveries	666	960	1,053
(Benefit) provision	(4,395)	(565)	(3,394)
Ending balance	11,253	15,676	16,375
Ending balance:
Individ. evaluated for impairment	605	1,974	1,140
Loans pooled for evaluation	10,423	13,251	14,749
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	32,429	33,074	27,763
Individ. evaluated for impairment	288	323	90
Loans pooled for evaluation	32,077	32,677	27,592
Loans acquired with deteriorated credit quality	64	74	81
Beginning balance	719	589	696
Charge-offs	(972)	(599)	(887)
Recoveries	500	495	759
(Benefit) provision	441	234	21
Ending balance	688	719	589
Ending balance:
Individ. evaluated for impairment	74	142	8
Loans pooled for evaluation	614	572	581
Construction [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	46,135	38,618	31,933
Individ. evaluated for impairment	4	2,683	2,756
Loans pooled for evaluation	45,410	35,260	27,611
Loans acquired with deteriorated credit quality	721	675	1,566
Beginning balance	1,434	1,559	1,400
Charge-offs		(4)	(20)
Recoveries	1,728	1,377	63
(Benefit) provision	(2,263)	(1,498)	116
Ending balance	899	1,434	1,559
Ending balance:
Individ. evaluated for impairment		60	91
Loans pooled for evaluation	844	332	751
Construction [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	74,774	36,518	17,170
Individ. evaluated for impairment	490	99	178
Loans pooled for evaluation	74,284	36,419	16,947
Loans acquired with deteriorated credit quality			45
Beginning balance	411	1,263	779
Charge-offs		(69)	(140)
Recoveries	140	181	65
(Benefit) provision	261	(964)	559
Ending balance	812	411	1,263
Ending balance:
Individ. evaluated for impairment			8
Loans pooled for evaluation	812	322	789
C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	194,913	174,945	131,878
Individ. evaluated for impairment	2,671	1,757	3,177
Loans pooled for evaluation	187,393	165,753	122,166
Loans acquired with deteriorated credit quality	4,849	7,435	6,535
Beginning balance	4,226	4,331	4,703
Charge-offs	(680)	(479)	(1,599)
Recoveries	677	1,268	340
(Benefit) provision	1,048	(894)	887
Ending balance	5,271	4,226	4,331
Ending balance:
Individ. evaluated for impairment	1,187	423	585
Loans pooled for evaluation	2,983	2,569	2,402
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	40,362	31,314	14,588
Individ. evaluated for impairment	1,731	1,279	778
Loans pooled for evaluation	37,004	29,266	13,324
Loans acquired with deteriorated credit quality	1,627	770	486
Beginning balance	1,797	1,208	1,155
Charge-offs	(242)	(29)	(94)
Recoveries	252	34	41
(Benefit) provision	1,331	584	106
Ending balance	3,138	1,797	1,208
Ending balance:
Individ. evaluated for impairment	294	284	169
Loans pooled for evaluation	2,844	1,513	1,039
Auto Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		112	946
Individ. evaluated for impairment		18	60
Loans pooled for evaluation		94	886
Beginning balance	9	66	243
Charge-offs	(4)	(3)	(68)
Recoveries	42	86	195
(Benefit) provision	(47)	(140)	(304)
Ending balance		9	66
Ending balance:
Individ. evaluated for impairment			1
Loans pooled for evaluation		9	65
RE Mortgage [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	314,265	279,420	195,013
Individ. evaluated for impairment	6,767	7,188	7,342
Loans pooled for evaluation	305,353	268,227	183,015
Loans acquired with deteriorated credit quality	2,145	4,005	4,656
Beginning balance	3,086	3,154	3,523
Charge-offs	(224)	(171)	(46)
Recoveries	204	2	345
(Benefit) provision	(559)	101	(668)
Ending balance	2,507	3,086	3,154
Ending balance:
Individ. evaluated for impairment	335	974	775
Loans pooled for evaluation	2,112	1,915	2,039
RE Mortgage [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,497,567	1,335,939	912,850
Individ. evaluated for impairment	32,407	41,932	59,936
Loans pooled for evaluation	1,442,100	1,263,090	822,654
Loans acquired with deteriorated credit quality	23,060	30,917	30,260
Beginning balance	9,227	9,700	8,782
Charge-offs		(110)	(2,038)
Recoveries	243	540	994
(Benefit) provision	1,973	(903)	1,962
Ending balance	11,443	9,227	9,700
Ending balance:
Individ. evaluated for impairment	395	410	1,198
Loans pooled for evaluation	9,596	8,408	7,815
Receivables Acquired with Deteriorated Credit Quality [Member]
Ending balance:
Loans acquired with deteriorated credit quality	2,893	3,427	4,040
Receivables Acquired with Deteriorated Credit Quality [Member] | Home Equity Lines of Credit [Member]
Ending balance:
Loans acquired with deteriorated credit quality	225	451	486
Receivables Acquired with Deteriorated Credit Quality [Member] | Other Consumer [Member]
Ending balance:
Loans acquired with deteriorated credit quality		5
Receivables Acquired with Deteriorated Credit Quality [Member] | Construction [Member] | Residential [Member]
Ending balance:
Loans acquired with deteriorated credit quality	55	1,042	717
Receivables Acquired with Deteriorated Credit Quality [Member] | Construction [Member] | Commercial [Member]
Ending balance:
Loans acquired with deteriorated credit quality		89	466
Receivables Acquired with Deteriorated Credit Quality [Member] | C&I [Member]
Ending balance:
Loans acquired with deteriorated credit quality	1,101	1,234	1,344
Receivables Acquired with Deteriorated Credit Quality [Member] | RE Mortgage [Member] | Residential [Member]
Ending balance:
Loans acquired with deteriorated credit quality	60	197	340
Receivables Acquired with Deteriorated Credit Quality [Member] | RE Mortgage [Member] | Commercial [Member]
Ending balance:
Loans acquired with deteriorated credit quality	$ 1,452	$ 409	$ 687

Allowance for Loan Losses - Pre

Allowance for Loan Losses - Presentation of Credit Quality Indicators (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 2,522,937	$ 2,282,524	$ 1,672,007
Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	46,135	38,618	31,933
Commercial [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	74,774	36,518	17,170
Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	322,492	352,584	339,866
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	32,429	33,074	27,763
Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,988,745	1,612,749
Originated Loans [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	31,778	21,135
Originated Loans [Member] | Commercial [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	66,285	24,545
Originated Loans [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	285,419	305,166
Originated Loans [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	28,998	28,230
PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	493,988	616,878
PNCI Loans [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	13,636	16,808
PNCI Loans [Member] | Commercial [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	8,489	11,973
PNCI Loans [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	29,335	38,397
PNCI Loans [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,367	4,770
PCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	40,204	52,897
PCI Loans [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	721	675
PCI Loans [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	7,738	9,021
PCI Loans [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	64	74
C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	194,913	174,945	131,878
C&I [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	170,320	126,611
C&I [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	19,744	40,899
C&I [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	4,849	7,435
Pass [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,918,006	1,537,988
Pass [Member] | Originated Loans [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	31,440	18,112
Pass [Member] | Originated Loans [Member] | Commercial [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	66,285	24,436
Pass [Member] | Originated Loans [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	275,251	292,244
Pass [Member] | Originated Loans [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	28,339	27,396
Pass [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	472,952	596,332
Pass [Member] | PNCI Loans [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	13,636	16,808
Pass [Member] | PNCI Loans [Member] | Commercial [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	8,489	11,973
Pass [Member] | PNCI Loans [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	27,378	36,531
Pass [Member] | PNCI Loans [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,164	4,399
Pass [Member] | C&I [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	166,559	124,707
Pass [Member] | C&I [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	19,666	40,628
Special Mention [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	17,646	18,836
Special Mention [Member] | Originated Loans [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	334	622
Special Mention [Member] | Originated Loans [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,494	3,590
Special Mention [Member] | Originated Loans [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	415	591
Special Mention [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	11,994	15,107
Special Mention [Member] | PNCI Loans [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	445	936
Special Mention [Member] | PNCI Loans [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	74	230
Special Mention [Member] | C&I [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,037	636
Special Mention [Member] | C&I [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		268
Substandard [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	53,093	55,925
Substandard [Member] | Originated Loans [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	4	2,401
Substandard [Member] | Originated Loans [Member] | Commercial [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		109
Substandard [Member] | Originated Loans [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	7,674	9,332
Substandard [Member] | Originated Loans [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	244	243
Substandard [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	9,042	5,439
Substandard [Member] | PNCI Loans [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,512	930
Substandard [Member] | PNCI Loans [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	129	141
Substandard [Member] | C&I [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,724	1,268
Substandard [Member] | C&I [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	78	3
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	40,362	31,314	14,588
Home Equity Loans [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	34,717	23,559
Home Equity Loans [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	4,018	6,985
Home Equity Loans [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,627	770
Home Equity Loans [Member] | Pass [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	31,427	20,976
Home Equity Loans [Member] | Pass [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,789	6,813
Home Equity Loans [Member] | Special Mention [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,027	743
Home Equity Loans [Member] | Special Mention [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	80	147
Home Equity Loans [Member] | Substandard [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,263	1,840
Home Equity Loans [Member] | Substandard [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	149	25
Auto Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		112	946
Auto Indirect [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		112
Auto Indirect [Member] | Pass [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		66
Auto Indirect [Member] | Special Mention [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		11
Auto Indirect [Member] | Substandard [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		35
RE Mortgage [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	314,265	279,420	195,013
RE Mortgage [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,497,567	1,335,939	$ 912,850
RE Mortgage [Member] | Originated Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	207,585	154,594
RE Mortgage [Member] | Originated Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,163,643	928,797
RE Mortgage [Member] | PNCI Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	104,535	120,821
RE Mortgage [Member] | PNCI Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	310,864	376,225
RE Mortgage [Member] | PCI Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,145	4,005
RE Mortgage [Member] | PCI Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	23,060	30,917
RE Mortgage [Member] | Pass [Member] | Originated Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	199,837	146,949
RE Mortgage [Member] | Pass [Member] | Originated Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,118,868	883,102
RE Mortgage [Member] | Pass [Member] | PNCI Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	102,895	119,643
RE Mortgage [Member] | Pass [Member] | PNCI Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	293,935	359,537
RE Mortgage [Member] | Special Mention [Member] | Originated Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,018	1,122
RE Mortgage [Member] | Special Mention [Member] | Originated Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	10,321	11,521
RE Mortgage [Member] | Special Mention [Member] | PNCI Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	600	547
RE Mortgage [Member] | Special Mention [Member] | PNCI Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	10,795	12,979
RE Mortgage [Member] | Substandard [Member] | Originated Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	5,730	6,523
RE Mortgage [Member] | Substandard [Member] | Originated Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	34,454	34,174
RE Mortgage [Member] | Substandard [Member] | PNCI Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,040	631
RE Mortgage [Member] | Substandard [Member] | PNCI Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 6,134	$ 3,709

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)Category	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of categories occupied under commercial real estate loans | Category	2
Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired TDRs Loans	$ 29,269,000	$ 45,676,000	$ 56,739,000
Additional funds in TDRs	35,000	54,000	25,000
PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired TDRs Loans	1,396,000	1,307,000	901,000
Obligations to lend additional funds on TDRs	$ 0	$ 0	$ 0
Minimum [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Period of collateral payment of loan	3 months
Maximum [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Period of collateral payment of loan	12 months

Allowance for Loan Losses - Ana

Allowance for Loan Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 10,172	$ 9,129
Current	1,978,573	1,603,620
Total orig. loans	1,988,745	1,612,749
> 90 Days and still accruing	0	0
Nonaccrual loans	22,824	32,529
PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	8,924	3,226
Current	485,064	613,652
Total orig. loans	493,988	616,878
> 90 Days and still accruing	0	0
Nonaccrual loans	5,398	1,646
Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,877
Current	283,542
Total orig. loans	285,419
> 90 Days and still accruing	0
Nonaccrual loans	3,379
Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	367
Current	28,968
Total orig. loans	29,335
> 90 Days and still accruing	0
Nonaccrual loans	676
Other Consumer [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	71
Current	28,927
Total orig. loans	28,998
> 90 Days and still accruing	0
Nonaccrual loans	21
Other Consumer [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	23
Current	3,344
Total orig. loans	3,367
> 90 Days and still accruing	0
Nonaccrual loans	33
C&I [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,221	899
Current	168,099	125,712
Total orig. loans	170,320	126,611
> 90 Days and still accruing	0	0
Nonaccrual loans	976	246
C&I [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1	67
Current	19,743	40,832
Total orig. loans	19,744	40,899
> 90 Days and still accruing	0	0
30-59 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,635	5,519
30-59 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7,259	2,668
30-59 Days [Member] | Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,033
30-59 Days [Member] | Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	92
30-59 Days [Member] | Other Consumer [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	12
30-59 Days [Member] | C&I [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,197	739
30-59 Days [Member] | C&I [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1	67
60-89 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,196	1,530
60-89 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	13	145
60-89 Days [Member] | Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	324
60-89 Days [Member] | Other Consumer [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	40
60-89 Days [Member] | Other Consumer [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	13
60-89 Days [Member] | C&I [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		99
> 90 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,341	2,080
> 90 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,652	413
> 90 Days [Member] | Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	520
> 90 Days [Member] | Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	275
> 90 Days [Member] | Other Consumer [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	19
> 90 Days [Member] | Other Consumer [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	10
> 90 Days [Member] | C&I [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	24	61
Home Equity Loans [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	825	1,009
Current	33,892	22,550
Total orig. loans	34,717	23,559
> 90 Days and still accruing	0	0
Nonaccrual loans	1,195	1,197
Home Equity Loans [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	94	25
Current	3,924	6,960
Total orig. loans	4,018	6,985
> 90 Days and still accruing	0	0
Nonaccrual loans	109	25
Home Equity Loans [Member] | 30-59 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	402	615
Home Equity Loans [Member] | 30-59 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	23
Home Equity Loans [Member] | 60-89 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	341	192
Home Equity Loans [Member] | > 90 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	82	202
Home Equity Loans [Member] | > 90 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	71	25
Auto Indirect [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		21
Current		91
Total orig. loans		112
> 90 Days and still accruing	0	0
Nonaccrual loans		18
Auto Indirect [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
> 90 Days and still accruing	0	0
Auto Indirect [Member] | 30-59 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		4
Auto Indirect [Member] | > 90 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		17
Construction [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		21,135
Total orig. loans	31,778	21,135
> 90 Days and still accruing	0	0
Nonaccrual loans	12	2,401
Construction [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	13,636	16,808
Total orig. loans	13,636	16,808
> 90 Days and still accruing	0	0
Construction [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		24,545
Total orig. loans	66,285	24,545
> 90 Days and still accruing	0	0
Nonaccrual loans		99
Construction [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	490
Current	7,999	11,973
Total orig. loans	8,489	11,973
> 90 Days and still accruing	0	0
Nonaccrual loans	490
Construction [Member] | > 90 Days [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	490
RE Mortgage [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,062	2,315
Current	206,523	152,279
Total orig. loans	207,585	154,594
> 90 Days and still accruing	0	0
Nonaccrual loans	3,045	3,430
RE Mortgage [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,164	2,304
Current	101,371	118,517
Total orig. loans	104,535	120,821
> 90 Days and still accruing	0	0
Nonaccrual loans	348	799
RE Mortgage [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,116	1,635
Current	1,159,527	927,162
Total orig. loans	1,163,643	928,797
> 90 Days and still accruing	0	0
Nonaccrual loans	14,196	20,736
RE Mortgage [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,785	260
Current	306,079	375,965
Total orig. loans	310,864	376,225
> 90 Days and still accruing	0	0
Nonaccrual loans	3,742	366
RE Mortgage [Member] | 30-59 Days [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	791	1,296
RE Mortgage [Member] | 30-59 Days [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,106	2,041
RE Mortgage [Member] | 30-59 Days [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	200	735
RE Mortgage [Member] | 30-59 Days [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,037	260
RE Mortgage [Member] | 60-89 Days [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		919
RE Mortgage [Member] | 60-89 Days [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		24
RE Mortgage [Member] | 60-89 Days [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	491
RE Mortgage [Member] | > 90 Days [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	271	100
RE Mortgage [Member] | > 90 Days [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	58	239
RE Mortgage [Member] | > 90 Days [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,425	900
RE Mortgage [Member] | > 90 Days [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 748
Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		3,116
Current		302,050
Total orig. loans		305,166
> 90 Days and still accruing		0
Nonaccrual loans		4,336
Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		466
Current		37,931
Total orig. loans		38,397
> 90 Days and still accruing		0
Nonaccrual loans		346
Home Equity Lines of Credit [Member] | 30-59 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		2,066
Home Equity Lines of Credit [Member] | 30-59 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		275
Home Equity Lines of Credit [Member] | 60-89 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		296
Home Equity Lines of Credit [Member] | 60-89 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		118
Home Equity Lines of Credit [Member] | > 90 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		754
Home Equity Lines of Credit [Member] | > 90 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		73
Other Consumer [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		134
Current		28,096
Total orig. loans		28,230
> 90 Days and still accruing		0
Nonaccrual loans		66
Other Consumer [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		104
Current		4,666
Total orig. loans		4,770
> 90 Days and still accruing		0
Nonaccrual loans		110
Other Consumer [Member] | 30-59 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		64
Other Consumer [Member] | 30-59 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		25
Other Consumer [Member] | 60-89 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		24
Other Consumer [Member] | 60-89 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		3
Other Consumer [Member] | > 90 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		46
Other Consumer [Member] | > 90 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		$ 76

Allowance for Loan Losses - Imp

Allowance for Loan Losses - Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	$ 3,056	$ 1,124
Unpaid principal, With no related allowance recorded	3,277	3,433
Average recorded Investment, With no related allowance recorded	2,090	1,344
Interest income Recognized, With no related allowance recorded	87	14
Recorded investment, With an allowance recorded	3,627	1,636
Unpaid principal, With an allowance recorded	3,744	1,654
Related allowance, With an allowance recorded	440	621
Average recorded Investment, With an allowance recorded	2,631	1,107
Interest income Recognized, With an allowance recorded	174	48
Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	35,505	48,466
Unpaid principal, With no related allowance recorded	43,892	61,660
Average recorded Investment, With no related allowance recorded	41,984	57,354
Interest income Recognized, With no related allowance recorded	1,031	1,095
Recorded investment, With an allowance recorded	7,917	11,021
Unpaid principal, With an allowance recorded	8,249	11,863
Related allowance, With an allowance recorded	2,450	3,646
Average recorded Investment, With an allowance recorded	9,469	11,938
Interest income Recognized, With an allowance recorded	302	409
C&I [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	1	7
Unpaid principal, With no related allowance recorded	1	7
Average recorded Investment, With no related allowance recorded	4	10
Interest income Recognized, With no related allowance recorded		1
C&I [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	576	412
Unpaid principal, With no related allowance recorded	688	433
Average recorded Investment, With no related allowance recorded	494	1,030
Interest income Recognized, With no related allowance recorded	29	26
Recorded investment, With an allowance recorded	2,094	1,338
Unpaid principal, With an allowance recorded	2,117	1,438
Related allowance, With an allowance recorded	1,187	423
Average recorded Investment, With an allowance recorded	1,716	1,428
Interest income Recognized, With an allowance recorded	122	71
Home Equity Loans [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	71	25
Unpaid principal, With no related allowance recorded	73	25
Average recorded Investment, With no related allowance recorded	48	12
Interest income Recognized, With no related allowance recorded	2
Recorded investment, With an allowance recorded	39
Unpaid principal, With an allowance recorded	40
Related allowance, With an allowance recorded	39
Average recorded Investment, With an allowance recorded	19
Home Equity Loans [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	947	750
Unpaid principal, With no related allowance recorded	1,349	1,187
Average recorded Investment, With no related allowance recorded	848	651
Interest income Recognized, With no related allowance recorded	5	6
Recorded investment, With an allowance recorded	674	504
Unpaid principal, With an allowance recorded	701	597
Related allowance, With an allowance recorded	256	284
Average recorded Investment, With an allowance recorded	589	365
Interest income Recognized, With an allowance recorded	26	13
Auto Indirect [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded		14
Unpaid principal, With no related allowance recorded		49
Average recorded Investment, With no related allowance recorded		35
Recorded investment, With an allowance recorded		4
Unpaid principal, With an allowance recorded		6
Average recorded Investment, With an allowance recorded		4
Construction [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	4	2,401
Unpaid principal, With no related allowance recorded	65	6,588
Average recorded Investment, With no related allowance recorded	1,202	2,437
Recorded investment, With an allowance recorded		282
Unpaid principal, With an allowance recorded		282
Related allowance, With an allowance recorded		60
Average recorded Investment, With an allowance recorded	141	283
Interest income Recognized, With an allowance recorded		19
Construction [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	490
Unpaid principal, With no related allowance recorded	490
Average recorded Investment, With no related allowance recorded	245
Interest income Recognized, With no related allowance recorded	18
Construction [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded		99
Unpaid principal, With no related allowance recorded		190
Average recorded Investment, With no related allowance recorded	50	84
Interest income Recognized, With no related allowance recorded		3
Average recorded Investment, With an allowance recorded		55
RE Mortgage [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	875	343
Unpaid principal, With no related allowance recorded	908	353
Average recorded Investment, With no related allowance recorded	609	246
Interest income Recognized, With no related allowance recorded	31	14
Recorded investment, With an allowance recorded		834
Unpaid principal, With an allowance recorded		852
Related allowance, With an allowance recorded		177
Average recorded Investment, With an allowance recorded	417	516
Interest income Recognized, With an allowance recorded		8
RE Mortgage [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	3,886	3,287
Unpaid principal, With no related allowance recorded	5,998	5,138
Average recorded Investment, With no related allowance recorded	3,586	3,826
Interest income Recognized, With no related allowance recorded	81	38
Recorded investment, With an allowance recorded	2,006	2,724
Unpaid principal, With an allowance recorded	2,073	2,865
Related allowance, With an allowance recorded	335	797
Average recorded Investment, With an allowance recorded	2,365	2,677
Interest income Recognized, With an allowance recorded	49	91
RE Mortgage [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	1,132	366
Unpaid principal, With no related allowance recorded	1,248	2,620
Average recorded Investment, With no related allowance recorded	749	753
Interest income Recognized, With no related allowance recorded	32
Recorded investment, With an allowance recorded	2,748	146
Unpaid principal, With an allowance recorded	2,858	146
Related allowance, With an allowance recorded	248	108
Average recorded Investment, With an allowance recorded	1,447	148
Interest income Recognized, With an allowance recorded	149	8
RE Mortgage [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	27,109	38,477
Unpaid principal, With no related allowance recorded	29,678	41,949
Average recorded Investment, With no related allowance recorded	32,793	45,915
Interest income Recognized, With no related allowance recorded	893	995
Recorded investment, With an allowance recorded	1,418	2,943
Unpaid principal, With an allowance recorded	1,453	3,101
Related allowance, With an allowance recorded	146	302
Average recorded Investment, With an allowance recorded	2,180	4,119
Interest income Recognized, With an allowance recorded	74	144
Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	454	346
Unpaid principal, With no related allowance recorded	505	374
Average recorded Investment, With no related allowance recorded	400	287
Interest income Recognized, With no related allowance recorded	3	(1)
Recorded investment, With an allowance recorded	606	436
Unpaid principal, With an allowance recorded	612	436
Related allowance, With an allowance recorded	80	205
Average recorded Investment, With an allowance recorded	521	319
Interest income Recognized, With an allowance recorded	14	20
Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	2,963	3,001
Unpaid principal, With no related allowance recorded	6,079	6,094
Average recorded Investment, With no related allowance recorded	2,982	3,355
Interest income Recognized, With no related allowance recorded	23	26
Recorded investment, With an allowance recorded	1,724	3,185
Unpaid principal, With an allowance recorded	1,904	3,533
Related allowance, With an allowance recorded	525	1,769
Average recorded Investment, With an allowance recorded	2,455	2,982
Interest income Recognized, With an allowance recorded	31	71
Other Consumer [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	33	37
Unpaid principal, With no related allowance recorded	52	54
Average recorded Investment, With no related allowance recorded	35	36
Interest income Recognized, With no related allowance recorded	1
Recorded investment, With an allowance recorded	234	220
Unpaid principal, With an allowance recorded	234	220
Related allowance, With an allowance recorded	73	131
Average recorded Investment, With an allowance recorded	227	124
Interest income Recognized, With an allowance recorded	11	12
Other Consumer [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, With no related allowance recorded	20	25
Unpaid principal, With no related allowance recorded	35	32
Average recorded Investment, With no related allowance recorded	29	21
Interest income Recognized, With no related allowance recorded		1
Recorded investment, With an allowance recorded	1	41
Unpaid principal, With an allowance recorded	1	41
Related allowance, With an allowance recorded	1	11
Average recorded Investment, With an allowance recorded	$ 23	$ 25

Allowance for Loan Losses - Tro

Allowance for Loan Losses - Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)SecurityLoan	Dec. 31, 2014USD ($)SecurityLoan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number | SecurityLoan	23	31
Pre-mod outstanding principal balance	$ 3,979	$ 4,754
Post-mod outstanding principal balance	3,973	4,656
Financial impact due to TDR taken as additional provision	$ 451	$ 279
Number that defaulted during the period | SecurityLoan	10	6
Recorded investment of TDRs that defaulted during the period	$ 736	$ 903
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ (9)	$ (8)
Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number | SecurityLoan	2	6
Pre-mod outstanding principal balance	$ 301	$ 940
Post-mod outstanding principal balance	$ 301	$ 967
Number that defaulted during the period | SecurityLoan	3	1
Recorded investment of TDRs that defaulted during the period	$ 182	$ 20
C&I [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number | SecurityLoan	8	7
Pre-mod outstanding principal balance	$ 956	$ 218
Post-mod outstanding principal balance	944	219
Financial impact due to TDR taken as additional provision	$ 405	$ 101
Number that defaulted during the period | SecurityLoan		1
Recorded investment of TDRs that defaulted during the period		$ 116
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions		$ (8)
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number | SecurityLoan	2	2
Pre-mod outstanding principal balance	$ 315	$ 100
Post-mod outstanding principal balance	321	102
Financial impact due to TDR taken as additional provision	$ 38	$ (1)
Number that defaulted during the period | SecurityLoan	1
Recorded investment of TDRs that defaulted during the period	$ 53
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ (9)
Construction [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number | SecurityLoan		1
Pre-mod outstanding principal balance		$ 102
Post-mod outstanding principal balance		$ 85
Construction [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number | SecurityLoan		2
Pre-mod outstanding principal balance		$ 219
Post-mod outstanding principal balance		$ 196
RE Mortgage [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number | SecurityLoan	4	5
Pre-mod outstanding principal balance	$ 800	$ 1,048
Post-mod outstanding principal balance	801	1,050
Financial impact due to TDR taken as additional provision	$ 8	$ 91
Number that defaulted during the period | SecurityLoan	4	2
Recorded investment of TDRs that defaulted during the period	$ 221	$ 344
RE Mortgage [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number | SecurityLoan	5	7
Pre-mod outstanding principal balance	$ 1,518	$ 1,980
Post-mod outstanding principal balance	1,517	1,890
Financial impact due to TDR taken as additional provision	$ (5)	$ 22
Number that defaulted during the period | SecurityLoan	2	2
Recorded investment of TDRs that defaulted during the period	$ 280	$ 423
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number | SecurityLoan	2	1
Pre-mod outstanding principal balance	$ 89	$ 147
Post-mod outstanding principal balance	89	147
Financial impact due to TDR taken as additional provision	$ 5	$ 66

Foreclosed Assets - Summary of

Foreclosed Assets - Summary of Activity in Balance of Foreclosed Assets (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)Assets	Dec. 31, 2014USD ($)Assets	Dec. 31, 2013USD ($)
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net	$ 4,894	$ 6,262
Acquisitions		695
Additions/transfers from loans	5,435	5,753
Dispositions/sales	(4,458)	(7,608)
Valuation adjustments	(502)	(208)
Ending balance, net	5,369	4,894	$ 6,262
Ending valuation allowance	$ (572)	$ (208)
Ending number of foreclosed assets | Assets	26	29
Proceeds from sale of foreclosed assets	$ 5,449	$ 9,762
Gain on sale of foreclosed assets	991	2,153	1,640
Noncovered [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net	4,449	5,588
Acquisitions		695
Additions/transfers from loans	5,880	5,753
Dispositions/sales	(4,458)	(7,391)
Valuation adjustments	(502)	(196)
Ending balance, net	5,369	4,449	5,588
Ending valuation allowance	$ (572)	$ (208)
Ending number of foreclosed assets | Assets	26	28
Proceeds from sale of foreclosed assets	$ 5,449	$ 9,517
Gain on sale of foreclosed assets	991	2,125
Covered [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net	445	674
Additions/transfers from loans	$ (445)
Dispositions/sales		(217)
Valuation adjustments		(12)
Ending balance, net		$ 445	$ 674
Ending number of foreclosed assets | Assets		1
Proceeds from sale of foreclosed assets		$ 245
Gain on sale of foreclosed assets		$ 28

Foreclosed Assets - Additional

Foreclosed Assets - Additional Information (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Foreclosed Assets Activity [Line Items]
Foreclosed assets	$ 5,369,000	$ 4,894,000	$ 6,262,000
Residential Real Estate [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Foreclosed assets	1,787,000
Formal foreclosure proceedings	$ 658,000

Premises and Equipment - Summar

Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment, Net, by Type [Abstract]
Land & land improvements	$ 8,909	$ 8,933
Buildings	38,643	39,638
Furniture and equipment	31,081	28,446
Premises and equipment, gross	78,633	77,017
Less: Accumulated depreciation	(35,518)	(33,570)
Premises and equipment less depreciation, gross	43,115	43,447
Construction in progress	696	46
Total premises and equipment	$ 43,811	$ 43,493

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Depreciation expense for premises and equipment	$ 5,043,000	$ 4,648,000	$ 3,635,000

Cash Value of Life Insurance -

Cash Value of Life Insurance - Summary of Activity in Balance of Cash Value of Life Insurance (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)PoliciesEmployeesCompany	Dec. 31, 2014USD ($)PoliciesEmployeesCompany	Dec. 31, 2013USD ($)
Increase (Decrease) in Insurance Liabilities [Abstract]
Beginning balance	$ 92,337	$ 52,309
Acquisitions		38,075
Increase in cash value of life insurance	2,786	1,953	$ 1,727
Death benefit receivable in excess of cash value	155
Death benefit receivable	(718)
Ending balance	94,560	92,337	$ 52,309
End of period death benefit	$ 166,299	$ 165,966
Number of policies owned | Policies	187	189
Insurance companies used | Company	14	14
Current and former employees and directors covered | Employees	59	60

Cash Value of Life Insurance 91

Cash Value of Life Insurance - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015PoliciesCompany	Dec. 31, 2014Company
Insurance [Abstract]
Number of life insurance policies owned by the Company	187
Insurance companies used | Company	14	14
Policies covering current and former employees and directors	59

Goodwill and Other Intangible92

Goodwill and Other Intangible Assets - Summary of Goodwill Intangible (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Ending Balance	$ 63,462
Goodwill, Additions	0
Goodwill, Reductions	0
Goodwill, Beginning Balance	$ 63,462

Goodwill and Other Intangible93

Goodwill and Other Intangible Assets - Summary of Core Deposit Intangibles (Detail) - Core deposit intangibles [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Finite-Lived Intangible Assets [Line Items]
Core deposit intangibles, Beginning balance	$ 8,074
Core deposit intangibles, Reductions/Amortization	0
Core deposit intangibles, Additions	0
Core deposit intangibles, Ending balance	8,074
Accumulated amortization, Beginning balance	(1,023)
Accumulated amortization, Reductions/Amortization	0
Accumulated amortization, Additions	(1,157)
Accumulated amortization, Ending balance	(2,180)
Core deposit intangibles, net, Beginning balance	7,051
Core deposit intangibles, net, Reductions/Amortization	0
Core deposit intangibles, net, Additions	(1,157)
Core deposit intangibles, net, Ending balance	$ 5,894

Goodwill and Other Intangible94

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	Oct. 03, 2014	Sep. 23, 2011	May. 28, 2010
North Valley Bancorp [Member]
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles	$ 6,614,000
Citizens [Member]
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles		$ 898,000
Granite [Member]
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles			$ 562,000

Goodwill and Other Intangible95

Goodwill and Other Intangible Assets - Estimated Core Deposit Intangible Amortization (Detail) - Core deposit intangibles [Member] $ in Thousands	Dec. 31, 2015USD ($)
Finite-Lived Intangible Assets [Line Items]
2,016	$ 1,157
2,017	1,109
2,018	1,044
2,019	948
2,020	948
Thereafter	$ 688

Mortgage Servicing Rights - Fai

Mortgage Servicing Rights - Fair Value of Mortgage Servicing Rights (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]
Contractually specified servicing fees, late fees and ancillary fees earned	$ 2,164	$ 1,869	$ 1,774
Weighted-average prepayment speed (CPR)	9.80%	12.00%	10.30%
Weighted-average discount rate	10.00%	10.00%	10.00%
Mortgage Servicing Rights [Member]
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period	$ 7,378	$ 6,165	$ 4,552
Acquisition		1,944
Originations	941	570	1,360
Change in fair value	(701)	(1,301)	253
Balance at end of period	7,618	7,378	6,165
Loans [Member]
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period	840,288	680,197	666,512
Balance at end of period	$ 817,917	$ 840,288	$ 680,197

Indemnification Asset_Liability

Indemnification Asset/Liability - Summary of Activity in Balance of Indemnification Asset (Liability) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
FDIC Indemnification Asset [Roll Forward]
Beginning balance	$ (349)	$ 206	$ 1,997
Effect of actual covered losses (recoveries) and increase (decrease) in estimated future covered losses	(93)	(853)	(1,419)
Change in estimated "true up" liability	(71)	(100)
Reimbursable (revenue) expenses, net	4	85	(159)
Payments made (received)	(12)	313	(213)
Ending balance	(521)	(349)	206
Amount of indemnification asset (liability) recorded in other assets	77	(349)	206
Amount of indemnification liability recorded in other liabilities	(598)
Ending balance	$ (349)	$ 206	$ 1,997

Other Assets - Summary of Other

Other Assets - Summary of Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred tax asset, net	$ 36,440	$ 37,706
Prepaid expense	3,062	3,378
Software	1,290	1,327
Advanced compensation	673	908
Capital Trusts	1,696	1,690
Investment in Low Housing Tax Credit Funds	4,223
Prepaid Taxes		5,599
Miscellaneous other assets	1,207	1,127
Total other assets	$ 48,591	$ 51,735

Deposits - Summary of Balances

Deposits - Summary of Balances of Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deposits [Abstract]
Noninterest-bearing demand	$ 1,155,695	$ 1,083,900
Interest-bearing demand	853,961	782,385
Savings	1,281,540	1,156,126
Time certificates, $250,000 and over	75,897	38,217
Other time certificates	264,173	319,795
Total deposits	$ 3,631,266	$ 3,380,423

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Deposits [Line Items]
Overdrawn deposit balances classified as consumer loans	$ 796,000	$ 1,216,000
California [Member]
Schedule Of Deposits [Line Items]
Certificate of deposits, included in time certificates $250,000 and over	$ 50,000,000	$ 5,000,000

Deposits - Schedule of Maturiti

Deposits - Schedule of Maturities of Time Deposits (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Summary of maturities of time deposits [Abstract]
2,016	$ 285,400
2,017	27,754
2,018	10,331
2,019	5,805
2,020	10,777
Thereafter	3
Total	$ 340,070

Reserve for Unfunded Commitm102

Reserve for Unfunded Commitments - Summary of Activity in Reserve for Unfunded Commitments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 2,145	$ 2,415	$ 3,615
Acquisitions		125
Provision for losses - Unfunded commitments	330	(395)	(1,200)
Balance at end of period	$ 2,475	$ 2,145	$ 2,415

Other Liabilities - Components

Other Liabilities - Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Deferred compensation	$ 6,725	$ 7,408
Pension liability	26,182	26,798
Joint beneficiary agreements	2,529	2,728
Low income housing tax credit fund commitments	3,330
Accrued salaries and benefits expense	3,851	5,407
Loan escrow and servicing payable	2,037	1,938
Deferred revenue	1,082	1,091
Unsettled investment security purchases	17,072
Miscellaneous other liabilities	2,485	3,822
Total other liabilities	$ 65,293	$ 49,192

Other Borrowings - Summary of B

Other Borrowings - Summary of Balances of Other Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total other borrowings	$ 12,328	$ 9,276
0.05% Fixed Rate Collateralized Borrowings [Member]
Debt Instrument [Line Items]
Other collateralized borrowings, fixed rate, as of December 31, 2015 of 0.05%, payable on January 4, 2016	$ 12,328	$ 9,276

Other Borrowings - Summary o105

Other Borrowings - Summary of Balances of Other Borrowings (Parenthetical) (Detail) - 0.05% Fixed Rate Collateralized Borrowings [Member]	12 Months Ended
	Dec. 31, 2015
Debt Instrument [Line Items]
Other collateralized borrowings, fixed rate	0.05%
Other collateralized borrowings, maturity date	Jan. 4, 2016

Other Borrowings - Additional I

Other Borrowings - Additional Information (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Security repurchase agreement	$ 0	$ 0
Other collateralized borrowings	12,328,000	$ 9,276,000
Repurchase investment securities sold and pledged as collateral under securities repurchase agreement	12,328,000
FHLB collateral line of credit, maximum borrowings capacity	1,143,065,000
FHLB collateral line of credit, outstanding balance	0
FHLB collateral line of credit, remaining borrowing capacity	1,143,065,000
Loans designated as potential collateral under collateralized line of credit with FHLB	94,351,000
Investment securities designated as potential collateral under collateral line of credit	1,673,789,000
Collateralized line of credit with San Francisco Federal Reserve Bank, maximum borrowings capacity	135,684,000
Collateralized line of credit with San Francisco Federal Reserve Bank, outstanding balance	0
Collateralized line of credit with San Francisco Federal Reserve Bank, remaining borrowing capacity	135,684,000
Investment securities designated as potential collateral under collateral line of credit with San Francisco Federal Reserve Bank	218,000
Loans designated as potential collateral under collateral line of credit with San Francisco Federal Reserve Bank	186,187,000
Unused correspondent banking lines of credit from commercial banks for federal funds	$ 15,000,000

Junior Subordinated Debt - Addi

Junior Subordinated Debt - Additional Information (Detail) - USD ($)	Oct. 03, 2014	Dec. 31, 2015	Dec. 31, 2014	Jun. 22, 2004	Jul. 31, 2003
Class of Stock [Line Items]
Common stock shares issued		22,775,173	22,714,964
Subordinated debenture, Face Value		$ 62,889,000
Subordinated debenture, recorded fair value		$ 56,470,000	$ 56,272,000
North Valley Bancorp [Member]
Class of Stock [Line Items]
Acquisition, completion date		Oct. 3, 2014
TriCo Capital Trust I [Member]
Class of Stock [Line Items]
Common stock shares issued					619
Common stock par value					$ 1,000
Issuance of common stock, aggregate value					$ 619,000
Issued Junior Subordinated Debenture to the trust					$ 20,619,000
Offering of cumulative trust preferred securities					20,000
Cumulative trust preferred securities for cash in an aggregate amount					$ 20,000,000
Redeem the trust preferred securities		Oct. 7, 2033
LIBOR Rate, Description		Three-month LIBOR plus 3.05%
Preferred securities redeemable interest rate		3.05%
Company paid underwriting fees, per trust preferred security		$ 7.50
Company paid underwriting fees aggregate		$ 150,000
Net proceeds were used to finance the opening of new branches, services and technology		19,850,000
Subordinated debenture, Face Value		20,619,000
Subordinated debenture, recorded fair value		$ 20,619,000
TriCo Capital Trust II [Member]
Class of Stock [Line Items]
Common stock shares issued				619
Common stock par value				$ 1,000
Issuance of common stock, aggregate value				$ 619,000
Issued Junior Subordinated Debenture to the trust				$ 20,619,000
Offering of cumulative trust preferred securities				20,000
Cumulative trust preferred securities for cash in an aggregate amount				$ 20,000,000
Redeem the trust preferred securities		Jul. 23, 2034
LIBOR Rate, Description		Three-month LIBOR plus 2.55%
Preferred securities redeemable interest rate		2.55%
Company paid underwriting fees, per trust preferred security		$ 2.50
Company paid underwriting fees aggregate		$ 50,000
Net proceeds were used to finance the opening of new branches, services and technology		19,950,000
Subordinated debenture, Face Value		20,619,000
Subordinated debenture, recorded fair value		20,619,000
North Valley Trust II [Member]
Class of Stock [Line Items]
Subordinated debenture, Face Value	$ 6,186,000	6,186,000
Acquisition of common stock interests	186,000
Subordinated debenture, recorded fair value	5,006,000	5,055,000
North Valley Trust III [Member]
Class of Stock [Line Items]
Subordinated debenture, Face Value	5,155,000	5,155,000
Acquisition of common stock interests	155,000
Subordinated debenture, recorded fair value	3,918,000	3,966,000
North Valley Trust IV [Member]
Class of Stock [Line Items]
Subordinated debenture, Face Value	10,310,000	10,310,000
Acquisition of common stock interests	310,000
Subordinated debenture, recorded fair value	$ 6,063,000	$ 6,211,000

Junior Subordinated Debt - Summ

Junior Subordinated Debt - Summary of Terms and Recorded Balance of Subordinated Debenture (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Oct. 03, 2014
Subordinated Borrowing [Line Items]
Subordinated debenture, Face Value	$ 62,889,000
Subordinated debenture, Recorded Book Value	$ 56,470,000	$ 56,272,000
TriCo Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Subordinated debenture, Maturity Date	Oct. 7, 2033
Subordinated debenture, Face Value	$ 20,619,000
Subordinated debenture, Coupon Rate	3.05%
Subordinated debenture, Current Coupon Rate	3.37%
Subordinated debenture, Recorded Book Value	$ 20,619,000
TriCo Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Subordinated debenture, Maturity Date	Jul. 23, 2034
Subordinated debenture, Face Value	$ 20,619,000
Subordinated debenture, Coupon Rate	2.55%
Subordinated debenture, Current Coupon Rate	2.87%
Subordinated debenture, Recorded Book Value	$ 20,619,000
North Valley Trust II [Member]
Subordinated Borrowing [Line Items]
Subordinated debenture, Maturity Date	Apr. 24, 2033
Subordinated debenture, Face Value	$ 6,186,000		$ 6,186,000
Subordinated debenture, Current Coupon Rate	3.58%
Subordinated debenture, Recorded Book Value	$ 5,055,000		5,006,000
North Valley Trust III [Member]
Subordinated Borrowing [Line Items]
Subordinated debenture, Maturity Date	Apr. 24, 2034
Subordinated debenture, Face Value	$ 5,155,000		5,155,000
Subordinated debenture, Current Coupon Rate	3.12%
Subordinated debenture, Recorded Book Value	$ 3,966,000		3,918,000
North Valley Trust IV [Member]
Subordinated Borrowing [Line Items]
Subordinated debenture, Maturity Date	Mar. 15, 2036
Subordinated debenture, Face Value	$ 10,310,000		10,310,000
Subordinated debenture, Current Coupon Rate	1.84%
Subordinated debenture, Recorded Book Value	$ 6,211,000		$ 6,063,000
LIBOR PLUS [Member] | TriCo Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Subordinated debenture, Coupon Rate	3.05%
LIBOR PLUS [Member] | TriCo Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Subordinated debenture, Coupon Rate	2.55%
LIBOR PLUS [Member] | North Valley Trust II [Member]
Subordinated Borrowing [Line Items]
Subordinated debenture, Coupon Rate	3.25%
LIBOR PLUS [Member] | North Valley Trust III [Member]
Subordinated Borrowing [Line Items]
Subordinated debenture, Coupon Rate	2.80%
LIBOR PLUS [Member] | North Valley Trust IV [Member]
Subordinated Borrowing [Line Items]
Subordinated debenture, Coupon Rate	1.33%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	Oct. 26, 2015USD ($)	Dec. 31, 2015USD ($)site$ / sharesshares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)	Aug. 21, 2007shares
Conversion of Stock [Line Items]
Reserves to satisfy Federal regulatory requirements		$ 70,660,000	$ 57,616,000
Number of sites leased under non-cancelable operating leases | site		41
Rent expense under operating leases		$ 6,241,000	4,786,000	$ 4,300,000
Rent expense offset by rent income		$ 217,000	$ 225,000	$ 216,000
Commitment expiration date		One year or less or other termination clauses and may require payment of a fee.
Letters of credit, issue period		One year or less
Overdraft privilege receivable criteria		All holders of such accounts who bring their accounts to a positive balance at least once every thirty days receive the overdraft privilege.
Class B common stock of Visa Inc. | shares		22,775,173	22,714,964		15,814,662
Conversion ratio		1.648265
Damages awarded value	$ 250,000
Common Class B [Member]
Conversion of Stock [Line Items]
Class B common stock of Visa Inc. | shares		13,396
Common Class A [Member]
Conversion of Stock [Line Items]
The value of the Class A shares | $ / shares		$ 77.55
Value of unredeemed Class A equivalent shares		$ 1,712,000

Commitments and Contingencie110

Commitments and Contingencies - Future Minimum Commitments under Non-Cancelable Operating Leases with Initial or Remaining Terms of One Year or More (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Leases [Abstract]
2,016	$ 3,067
2,017	2,400
2,018	1,755
2,019	1,211
2,020	2,382
Thereafter	659
Future minimum lease payments	$ 11,474

Commitments and Contingencie111

Commitments and Contingencies - Summary of Bank's Commitments and Contingent Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit
Construction [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 71,846	$ 49,774
RE Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	42,793	36,139
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	8,330	17,531
Commercial [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	196,399	177,557
Other Consumer [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	394,278	392,705
Deposit Account Overdraft Privilege [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 94,473	$ 101,060

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 21, 2007
Class of Stock [Line Items]
Shareholder Rights Plan	Jun. 25, 2001
Percentage of restriction on acquiring outstanding common stock by person or group	15.00%
Repurchase of common stock					500,000
Stock repurchase plan percentage of common stock					3.20%
Common stock, shares outstanding	22,775,173	22,714,964			15,814,662
Repurchased shares outstanding	166,600
Market value of common stock	$ 2,868,000	$ 2,551,000	$ 3,490,000
Maximum [Member]
Class of Stock [Line Items]
Dividend payable by bank	$ 73,297,000
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares outstanding	22,775,173	22,714,964	16,076,662	16,000,838
Company's common stock in lieu of cash to exercise options to purchase shares	106,355	103,268	172,941
Market value of common stock	$ 2,868,000	$ 2,551,000	$ 3,490,000
Tri Counties Bank [Member]
Class of Stock [Line Items]
Cash dividends received	$ 13,304,000	$ 8,270,000	$ 8,175,000
Mellon Investor Services LLC [Member] | Amendment [Member]
Class of Stock [Line Items]
Amendment date of Right Plan	Jun. 4, 2014

Stock Options and Other Equi113

Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)	Aug. 11, 2018	Aug. 11, 2017	Aug. 11, 2016	Aug. 11, 2015	Dec. 31, 2014	Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options under the plan					1,102,850	948,350
Options currently not exercisable yet expected to vest						237,700
Weighted-average remaining contractual term						1 year 7 months 6 days
Pre-tax compensation costs expected to recognize						$ 1,066,000
Restricted Stock Units (RSUs) [Member] | Service Condition Vesting RSUs [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units outstanding expected to vest					30,920	46,286
Weighted-average remaining contractual term						1 year 6 months
Pre-tax compensation costs						$ 730,000
Number of units granted					13,749	30,348
RSUs vesting grant date						Aug. 11, 2014
Percentage of vesting schedule				25.00%
Number of units released						12,064
Restricted Stock Units (RSUs) [Member] | Service Condition Vesting RSUs [Member] | Forecast [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Percentage of vesting schedule	25.00%	25.00%	25.00%
Restricted Stock Units (RSUs) [Member] | Market Plus Service Condition Vesting RSUs [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units outstanding expected to vest					15,366	32,097
Weighted-average remaining contractual term						2 years
Pre-tax compensation costs						$ 452,000
Number of units granted						18,348
Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Maximum aggregate number of shares of TriCo's common stock issued						650,000
Minimum [Member] | Restricted Stock Units (RSUs) [Member] | Market Plus Service Condition Vesting RSUs [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units released						0
Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Maximum aggregate number of shares of TriCo's common stock issued						1,650,000
Maximum [Member] | Restricted Stock Units (RSUs) [Member] | Market Plus Service Condition Vesting RSUs [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units released						48,146
2009 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
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
Outstanding options under the plan						670,000
Options available for grant under the plan						734,107
2009 Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units outstanding expected to vest						78,383
2001 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options under the plan						278,350
Options available for grant under the plan						0
Share based compensation grant expiry period						10 years

Stock Options and Other Equi114

Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, Number of Shares, beginning balance | shares	1,102,850
Options granted, Number of Shares | shares	0
Options exercised, Number of Shares | shares	(154,000)
Options forfeited, Number of Shares | shares	0
Options outstanding, Number of Shares, ending balance | shares	948,350
Options outstanding, Weighted Average Exercise Price, beginning balance	$ 18.25
Options granted, Weighted Average Exercise Price	0
Options exercised, Weighted Average Exercise Price	20.17
Options forfeited, Weighted Average Exercise Price	0
Options outstanding, Weighted Average Exercise Price, ending balance	17.94
Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, Option Price per Share, beginning balance	12.63
Options granted, Option Price per Share	0
Options exercised, Option Price per Share	15.34
Options forfeited, Option Price per Share	0
Options outstanding, Option Price per Share, ending balance	12.63
Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, Option Price per Share, beginning balance	25.91
Options granted, Option Price per Share	0
Options exercised, Option Price per Share	22.54
Options forfeited, Option Price per Share	0
Options outstanding, Option Price per Share, ending balance	$ 25.91

Stock Options and Other Equi115

Stock Options and Other Equity-Based Incentive Instruments - Summary of Options Outstanding (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options | shares	948,350
Weighted average exercise price | $ / shares	$ 17.94
Intrinsic value (in thousands) | $	$ 9,010
Weighted average remaining contractual term (yrs.)	4 years 9 months 18 days
Currently Exercisable [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options | shares	710,650
Weighted average exercise price | $ / shares	$ 18.10
Intrinsic value (in thousands) | $	$ 6,641
Weighted average remaining contractual term (yrs.)	4 years 1 month 6 days
Currently Not Exercisable [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options | shares	237,700
Weighted average exercise price | $ / shares	$ 17.48
Intrinsic value (in thousands) | $	$ 2,369
Weighted average remaining contractual term (yrs.)	6 years 7 months 6 days

Stock Options and Other Equi116

Stock Options and Other Equity-Based Incentive Instruments - Information about Options (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Information about Options
Intrinsic value of options exercised	$ 969,000	$ 1,209,000	$ 1,777,000
Fair value of options that vested	734,000	965,000	1,150,000
Total compensation costs for options recognized in income	734,000	965,000	1,150,000
Total tax benefit recognized in income related to compensation costs for options	$ 380,000	$ 378,000	$ 484,000
Weighted average fair value of grants (per option)		$ 8.17	$ 8.91

Stock Options and Other Equi117

Stock Options and Other Equity-Based Incentive Instruments - Weighted-Average Assumptions Used to Determine Fair Value of Options Granted (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assumptions used to value option grants:
Average expected terms (years)	0 years	6 years 3 months 18 days	7 years
Volatility		42.10%	56.20%
Annual rate of dividends		1.90%	1.87%
Discount rate		1.69%	1.26%

Stock Options and Other Equi118

Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs) [Member] - $ / shares	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015
Market Plus Service Condition Vesting RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding, Number of RSUs, beginning balance		15,366
RSUs granted, Number of RSUs		18,348
RSUs forfeited/expired, Number of RSUs		(1,617)
RSUs outstanding, Number of RSUs, ending balance	15,366	32,097
RSUs granted, Weighted Average Fair Value on Date of Grant		$ 21.01
Service Condition Vesting RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding, Number of RSUs, beginning balance		30,920
RSUs granted, Number of RSUs	13,749	30,348
RSUs added through dividend credits, Number of RSUs		962
RSUs released, Number of RSUs		(12,064)
RSUs forfeited/expired, Number of RSUs		(3,880)
RSUs outstanding, Number of RSUs, ending balance	30,920	46,286
RSUs granted, Weighted Average Fair Value on Date of Grant		$ 23.45

Stock Options and Other Equi119

Stock Options and Other Equity-Based Incentive Instruments - Summary of Compensation Costs for RSUs (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Service Condition Vesting RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation costs for RSUs recognized in income	$ 458,000	$ 126,000
Market Plus Service Condition Vesting RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation costs for RSUs recognized in income	$ 179,000	$ 42,000

Noninterest Income and Expen120

Noninterest Income and Expense - Components of Other Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Service charges on deposit accounts									$ 14,276	$ 11,811	$ 12,716
ATM and interchange fees									13,105	9,651	8,370
Other service fees									2,977	2,206	2,144
Mortgage banking service fees									2,164	1,869	1,774
Change in value of mortgage servicing rights									(701)	(1,301)	253
Total service charges and fees									31,821	24,236	25,257
Gain on sale of loans									3,064	2,032	5,602
Commissions on sale of non-deposit investment products									3,349	2,995	2,983
Increase in cash value of life insurance									2,786	1,953	1,727
Change in indemnification asset									(207)	(856)	(1,649)
Gain on sale of foreclosed assets									991	2,153	1,640
Sale of customer checks									492	450	377
Lease brokerage income									712	504	337
Gain (loss) on disposal of fixed assets									(129)	49	(39)
Gain on life insurance death benefit									155
Other									2,313	1,000	594
Total other noninterest income									13,526	10,280	11,572
Total noninterest income	$ 11,445	$ 11,642	$ 12,080	$ 10,180	$ 9,755	$ 8,589	$ 7,877	$ 8,295	$ 45,347	$ 34,516	$ 36,829

Noninterest Income and Expen121

Noninterest Income and Expense - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Mortgage loan servicing fees, net of change in fair value of mortgage loan servicing rights	$ 1,463,000	$ 568,000	$ 2,027,000

Noninterest Income and Expen122

Noninterest Income and Expense - Components of Noninterest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Other Noninterest Income And Expense [Line Items]
Base salaries, net of deferred loan origination costs									$ 46,822	$ 39,342	$ 34,404
Incentive compensation									6,964	5,068	4,694
Benefits and other compensation costs									17,619	13,134	12,838
Total salaries and benefits expense									71,405	57,544	51,936
Occupancy									10,126	8,203	7,405
Equipment									5,997	4,514	4,162
Data processing and software									7,670	6,512	4,844
Assessments									2,572	2,107	2,248
ATM network charges									3,371	2,996	2,480
Advertising									3,992	2,413	1,981
Professional fees									4,545	3,888	2,707
Telecommunications									3,007	2,870	2,449
Postage									1,296	949	786
Courier service									1,154	1,055	988
Foreclosed assets expense									490	528	514
Intangible amortization									1,157	446	209
Operational losses									737	764	618
Provision for foreclosed asset losses									502	208	682
Reserve for unfunded commitments									330	(395)	(1,200)
Legal settlement											339
Merger expense									586	4,858	312
Other									11,904	10,919	10,144
Total other noninterest expense									59,436	52,835	41,668
Total noninterest expense	$ 34,684	$ 31,439	$ 32,436	$ 32,282	$ 36,566	$ 25,380	$ 25,116	$ 23,317	130,841	110,379	93,604
North Valley Bancorp [Member]
Schedule Of Other Noninterest Income And Expense [Line Items]
Data processing and software									108	475
Professional fees									120	2,390	312
Merger expense									586	4,858	$ 312
Other									$ 358	725
North Valley Bancorp [Member] | Incentive Compensation [Member]
Schedule Of Other Noninterest Income And Expense [Line Items]
Merger expense										1,174
North Valley Bancorp [Member] | Benefits and Other Compensation Costs [Member]
Schedule Of Other Noninterest Income And Expense [Line Items]
Merger expense										$ 94

Income Taxes - Components of Co

Income Taxes - Components of Consolidated Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax expense
Federal									$ 21,076	$ 14,485	$ 11,618
State									7,139	5,016	4,261
Current tax expense, Total									28,215	19,501	15,879
Deferred tax expense (benefit)
Federal									408	(794)	1,976
State									273	(199)	550
Deferred tax benefit, Total									681	(993)	2,526
Total tax expense	$ 7,388	$ 8,368	$ 7,432	$ 5,708	$ 3,930	$ 6,001	$ 3,537	$ 5,040	$ 28,896	$ 18,508	$ 18,405

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes (Textual) [Abstract]
Unfunded status of the supplemental retirement plans, net of tax	$ (3,324,000)	$ (4,570,000)	$ (1,269,000)
Unrealized gains and losses on available-for-sale investment securities	(797,000)	(68,000)	(1,780,000)
Taxes (benefits) related to employee stock options	479,000	97,000	$ 138,000
Tax credits and other tax benefits relating to investments	354,000
Amortization expense	277,000	0
Carrying value of low income housing tax credit funds	4,223,000
Low income housing tax credit fund commitments	3,330,000
Unrecognized tax benefit	168,000	227,000
Interest	0	0
Penalties	0	$ 0
North Valley Bancorp [Member]
Income Taxes (Textual) [Abstract]
Unrecognized tax benefits, if recognized	182,000
Unrecognized tax benefit	116,000
Federal [Member]
Income Taxes (Textual) [Abstract]
Net operating loss carryforwards	9,200,000
Capital loss carryforwards	78,000
Tax credit carryforwards	69,000
California [Member]
Income Taxes (Textual) [Abstract]
Net operating loss carryforwards	30,700,000
Capital loss carryforwards	356,000
Tax credit carryforwards	$ 2,700,000

Income Taxes - Company's Net De

Income Taxes - Company's Net Deferred Tax Asset Recorded in Other Assets (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for losses and reserve for unfunded commitments	$ 16,182,000	$ 16,284,000
Deferred compensation	2,827,000	3,115,000
Accrued pension liability	8,597,000	7,925,000
Accrued bonus	1,326,000	1,149,000
Other accrued expenses	143,000	124,000
Unfunded status of the supplemental retirement plans	2,411,000	3,315,000
State taxes	2,297,000	1,713,000
Share based compensation	2,701,000	2,534,000
Nonaccrual interest	1,979,000	2,714,000
OREO write downs	241,000	198,000
Acquisition cost basis	5,118,000	6,017,000
Tax credits	491,000	490,000
Net operating loss carryforwards	5,252,000	7,128,000
Other	889,000	625,000
Total deferred tax assets	50,454,000	53,331,000
Deferred tax liabilities:
Securities income	(1,362,000)	(1,362,000)
Unrealized gain on securities	(902,000)	(1,699,000)
Depreciation	(2,654,000)	(3,072,000)
Merger related fixed asset valuations	(54,000)	(54,000)
Securities accretion	(485,000)	(287,000)
Mortgage servicing rights valuation	(3,118,000)	(2,977,000)
Indemnification asset	219,000	147,000
Core deposit intangible	(2,331,000)	(2,802,000)
Junior subordinated debt	(2,699,000)	(2,782,000)
Prepaid expenses and other	(628,000)	(737,000)
Total deferred tax liability	(14,014,000)	(15,625,000)
Net deferred tax asset	$ 36,440,000	$ 37,706,000

Income Taxes - Summary of Chang

Income Taxes - Summary of Changes in Unrecognized Tax Benefit (Including Interest and Penalties) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Income Tax Disclosure [Abstract]
UTB, Beginning Balance	$ 227
UTB, Lapse of the applicable statute of limitations	(59)
UTB, Ending Balance	168
Interest/Penalties, Beginning Balance	18
Interest/Penalties, Lapse of the applicable statute of limitations	(4)
Interest/Penalties, Ending Balance	14
Total, Beginning Balance	245
Total, Lapse of the applicable statute of limitations	(63)
Total, Ending Balance	$ 182

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	6.60%	7.00%	6.80%
Tax-exempt interest on municipal obligations	(0.70%)	(0.40%)	(0.40%)
Tax-exempt life insurance related income	(1.30%)	(1.50%)	(1.30%)
Non-deductible joint beneficiary agreement expense	0.10%	0.20%	0.20%
Non-deductible merger expense		1.00%
Other		0.20%	(0.10%)
Effective Tax Rate	39.70%	41.50%	40.20%

Earnings per Share - Computatio

Earnings per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 11,422	$ 12,694	$ 11,366	$ 8,336	$ 5,650	$ 8,234	$ 4,859	$ 7,365	$ 43,818	$ 26,108	$ 27,399
Average number of common shares outstanding									22,750	17,716	16,045
Effect of dilutive stock options									248	207	152
Average number of common shares outstanding used to calculate diluted earnings per share									22,998	17,923	16,197

Earnings per Share - Additional

Earnings per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Options and restricted stock units excluded from diluted earnings per share because the effect of these options and restricted stock units was antidilutive	20,625	95,600	407,985

Comprehensive Income - Componen

Comprehensive Income - Components of Other Comprehensive Income and Related Tax Effects (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Unrealized holding losses on available for sale securities before reclassifications	$ (1,895)	$ (162)	$ (4,232)
Amounts reclassified out of accumulated other comprehensive income	0	0	0
Unrealized holding losses on available for sale securities after reclassifications	(1,895)	(162)	(4,232)
Tax effect	797	68	1,780
Unrealized holding losses on available for sale securities, net of tax	(1,098)	(94)	(2,452)
Change in unfunded status of the supplemental retirement plans before reclassifications	1,384	(7,253)	2,575
Amounts reclassified out of accumulated other comprehensive income:
Amortization of prior service cost	(57)	138	153
Amortization of actuarial losses	823	17	291
Total amounts reclassified out of accumulated other comprehensive income	766	155	444
Change in unfunded status of the supplemental retirement plans after reclassifications	2,150	(7,098)	3,019
Tax effect	(904)	2,984	(1,269)
Change in unfunded status of the supplemental retirement plans, net of tax	1,246	(4,114)	1,750
Change in joint beneficiary agreement liability before reclassifications	277	148	400
Amounts reclassified out of accumulated other comprehensive income	0	0	0
Change in joint beneficiary agreement liability after reclassifications	277	148	400
Tax effect	0	0	0
Change in joint beneficiary agreement liability, net of tax	277	148	400
Total other comprehensive income (loss)	$ 425	$ (4,060)	$ (302)

Comprehensive Income - Compo131

Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Net unrealized gains on available for sale securities	$ 2,145	$ 4,040
Tax effect	(902)	(1,699)
Unrealized holding gains on available for sale securities, net of tax	1,243	2,341
Unfunded status of the supplemental retirement plans	(5,735)	(7,885)
Tax effect	2,411	3,315
Unfunded status of the supplemental retirement plans, net of tax	(3,324)	(4,570)	$ (1,269)
Joint beneficiary agreement liability	303	26
Tax effect	0	0
Joint beneficiary agreement liability, net of tax	303	26
Accumulated other comprehensive loss	$ (1,778)	$ (2,203)

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) - USD ($)	Jul. 01, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Salaries & benefits expense		$ 71,405,000	$ 57,544,000	$ 51,936,000
Contribution and paid out as benefits under ESOP		$ 2,651,000	1,294,000	1,648,000
Employee service period under ESOP		1 year
Deferred compensation obligations		$ 6,725,000	7,408,000
Earnings credits on deferred balances included in noninterest expense		538,000	551,000	568,000
Cash values of the insurance policies purchased to fund deferred compensation obligations		94,560,000	92,337,000	52,309,000
Unfunded status of the supplemental retirement plans		(5,735,000)	(7,885,000)
Accumulated other comprehensive loss		3,324,000	4,570,000
Deferred tax asset		2,411,000	3,315,000
Net actuarial loss		549,000
Salaries and Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expenses related to ESOP		$ 2,282,000	1,467,000	1,648,000
401(k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum age for employees		21 years
Minimum period for employees to participate		90 days
Discretionary matching contribution equal to percentage of participant's contribution	50.00%
Discretionary matching contribution maximum percentage of eligible compensation	4.00%
Salaries & benefits expense		$ 300,000	0	$ 0
Supplemental Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash values of the insurance policies purchased to fund deferred compensation obligations		94,560,000	92,337,000
Unfunded status of the supplemental retirement plans		5,735,000	7,885,000
Accumulated other comprehensive loss		3,324,000	4,570,000
Deferred tax asset		$ 2,411,000	$ 3,315,000

Retirement Plans - Defined Bene

Retirement Plans - Defined Benefit Pension Plans (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Transition obligation	$ 7,000	$ 9,000
Prior service cost	(115,000)	(173,000)
Net actuarial loss	5,843,000	8,049,000
Amount included in accumulated other comprehensive loss	5,735,000	7,885,000
Deferred tax benefit	(2,411,000)	(3,315,000)
Amount included in accumulated other comprehensive loss, net of tax	$ 3,324,000	$ 4,570,000

Retirement Plans - Information

Retirement Plans - Information Pertaining to Activity in Supplemental Retirement Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in benefit obligation:
Benefit obligation at beginning of year	$ (26,798)	$ (14,634)
Acquisition		(4,150)
Service cost	(1,023)	(652)	$ (743)
Interest cost	(957)	(739)	(643)
Actuarial (loss)/gain	1,382	(7,254)
Benefits paid	1,212	631
Benefit obligation at end of year	(26,184)	(26,798)	(14,634)
Change in plan assets:
Fair value of plan assets at beginning of year	0	0
Fair value of plan assets at end of year	0	0	$ 0
Funded status	(26,184)	(26,798)
Unrecognized net obligation existing at January 1, 1986	7	9
Unrecognized net actuarial loss	5,843	8,049
Unrecognized prior service cost	(115)	(173)
Accumulated other comprehensive income	(5,735)	(7,885)
Accrued benefit cost	(26,184)	(26,798)
Accumulated benefit obligation	$ (24,469)	$ (24,739)

Retirement Plans - Net Periodic

Retirement Plans - Net Periodic Benefit Cost Recognized for Supplemental Retirement Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net pension cost included the following components:
Service cost-benefits earned during the period	$ 1,023	$ 652	$ 743
Interest cost on projected benefit obligation	957	739	643
Amortization of net obligation at transition	2	2	2
Amortization of prior service cost	(57)	138	153
Recognized net actuarial loss	823	16	291
Net periodic pension cost	$ 2,748	$ 1,547	$ 1,832

Retirement Plans - Assumptions

Retirement Plans - Assumptions Used in Accounting for Plans (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	4.00%	3.65%	4.85%
Discount rate used to calculate net periodic pension cost	4.00%	3.65%	4.85%
Executive Compensation [Member]
Defined Benefit Plan Disclosure [Line Items]
Average annual increase in compensation	2.50%	2.50%	2.50%
Director Compensation [Member]
Defined Benefit Plan Disclosure [Line Items]
Average annual increase in compensation	2.50%	2.50%	2.50%

Retirement Plans - Expected Ben

Retirement Plans - Expected Benefit Payments to Participants and Estimated Contributions to be Made by Company (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Compensation and Retirement Disclosure [Abstract]
Expected Benefit Payments to Participants, 2016	$ 1,104
Expected Benefit Payments to Participants, 2017	983
Expected Benefit Payments to Participants, 2018	974
Expected Benefit Payments to Participants, 2019	845
Expected Benefit Payments to Participants, 2020	731
Expected Benefit Payments to Participants, 2021-2025	3,490
Estimated Company Contributions, 2016	1,104
Estimated Company Contributions, 2017	983
Estimated Company Contributions, 2018	974
Estimated Company Contributions, 2019	845
Estimated Company Contributions, 2020	731
Estimated Company Contributions, 2021-2025	$ 3,490

Related Party Transactions - Su

Related Party Transactions - Summary of Activity in Lending Transactions (Detail) - Directors and Officers [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Beginning balance	$ 3,132	$ 2,636
Advances/new loans	3,098	2,106
Removed/payments	(2,029)	(1,610)
Ending balance	$ 4,201	$ 3,132

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Modern Building Inc. [Member]
Related Party Transaction [Line Items]
Aggregate payments for construction services	$ 1,030,000	$ 1,181,000	$ 4,261,000

Fair Value Measurement - Record

Fair Value Measurement - Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 6,488	$ 5,091
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	6,488	5,091
Fair Value Measurements on Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	412,503	90,583
Fair Value Measurements on Recurring Basis [Member] | Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	313,682	75,120
Fair Value Measurements on Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	88,218	3,175
Fair Value Measurements on Recurring Basis [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value		1,908
Fair Value Measurements on Recurring Basis [Member] | Marketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,985	3,002
Fair Value Measurements on Recurring Basis [Member] | Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	7,618	7,378
Fair Value Measurements on Recurring Basis [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,985	3,002
Fair Value Measurements on Recurring Basis [Member] | Level 1 [Member] | Marketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,985	3,002
Fair Value Measurements on Recurring Basis [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	401,900	80,203
Fair Value Measurements on Recurring Basis [Member] | Level 2 [Member] | Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	313,682	75,120
Fair Value Measurements on Recurring Basis [Member] | Level 2 [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	88,218	3,175
Fair Value Measurements on Recurring Basis [Member] | Level 2 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value		1,908
Fair Value Measurements on Recurring Basis [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	7,618	7,378
Fair Value Measurements on Recurring Basis [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 7,618	$ 7,378

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 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	0
Securities held to maturity	726,530,000	676,426,000
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity	$ 0	$ 0

Fair Value Measurement - Reconc

Fair Value Measurement - Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis (Detail) - Mortgage Servicing Rights [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Ending Balance	$ 7,618	$ 7,378
Transfers into (out of) Level 3		1,944
Change Included in Earnings	(701)	(1,301)
Issuances	941	570
Beginning Balance	$ 7,378	$ 6,165

Fair Value Measurement - Quanti

Fair Value Measurement - Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate	9.80%	12.00%	10.30%
Discount rate	10.00%	10.00%	10.00%
Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortgages Servicing Rights, Fair Value	$ 7,618	$ 7,378	$ 6,165	$ 4,552
Minimum [Member] | Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	10.00%
Minimum [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate	6.30%
Maximum [Member] | Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	12.00%
Maximum [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate	20.50%
Weighted Average [Member] | Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	10.00%
Weighted Average [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate	9.80%

Fair Value Measurement - Assets

Fair Value Measurement - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 6,488	$ 5,091
Total Gains/(Losses)	(1,081)	(773)
Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	4,649	2,480
Total Gains/(Losses)	(663)	(636)
Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	1,839	2,611
Total Gains/(Losses)	(418)	(137)
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	6,488	5,091
Level 3 [Member] | Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	4,649	2,480
Level 3 [Member] | Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 1,839	$ 2,611

Fair Value Measurement - Qua145

Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 6,488	$ 5,091
Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	4,649	2,480
Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,839	2,611
Foreclosed Assets [Member] | Land & Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	201
Foreclosed Assets [Member] | Residential Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	814
Foreclosed Assets [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	824
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	6,488	5,091
Level 3 [Member] | Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	4,649	2,480
Level 3 [Member] | Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 1,839	$ 2,611
Level 3 [Member] | Sales Comparison Approach [Member] | Minimum [Member] | Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(5.00%)
Level 3 [Member] | Sales Comparison Approach [Member] | Minimum [Member] | Foreclosed Assets [Member] | Land & Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(5.00%)
Level 3 [Member] | Sales Comparison Approach [Member] | Minimum [Member] | Foreclosed Assets [Member] | Residential Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(5.00%)
Level 3 [Member] | Sales Comparison Approach [Member] | Minimum [Member] | Foreclosed Assets [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(7.00%)
Level 3 [Member] | Sales Comparison Approach [Member] | Maximum [Member] | Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(5.00%)
Level 3 [Member] | Sales Comparison Approach [Member] | Maximum [Member] | Foreclosed Assets [Member] | Land & Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(7.00%)
Level 3 [Member] | Sales Comparison Approach [Member] | Maximum [Member] | Foreclosed Assets [Member] | Residential Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(8.00%)
Level 3 [Member] | Sales Comparison Approach [Member] | Maximum [Member] | Foreclosed Assets [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(9.00%)
Level 3 [Member] | Sales Comparison Approach [Member] | Weighted Average [Member] | Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(5.00%)
Level 3 [Member] | Sales Comparison Approach [Member] | Weighted Average [Member] | Foreclosed Assets [Member] | Land & Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(5.59%)
Level 3 [Member] | Sales Comparison Approach [Member] | Weighted Average [Member] | Foreclosed Assets [Member] | Residential Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(6.04%)
Level 3 [Member] | Sales Comparison Approach [Member] | Weighted Average [Member] | Foreclosed Assets [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustment for differences between comparable sales	(7.50%)
Level 3 [Member] | Income Approach [Member] | Minimum [Member] | Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capitalization rate	7.00%
Level 3 [Member] | Income Approach [Member] | Maximum [Member] | Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capitalization rate	8.00%
Level 3 [Member] | Income Approach [Member] | Weighted Average [Member] | Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capitalization rate	7.25%

Fair Value Measurement - Estima

Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Financial assets:
Cash and due from banks	$ 94,305,000	$ 93,150,000
Cash at Federal Reserve and other banks	209,156,000	517,578,000
Securities held to maturity	726,530,000	676,426,000
Financial liabilities:
Other borrowings	12,328,000	9,276,000
Junior subordinated debt	56,470,000	56,272,000
Level 3 [Member]
Financial assets:
Securities held to maturity	0	0
Contract Amount [Member] | Level 3 [Member]
Off-balance sheet:
Commitments	705,316,000	656,175,000
Standby letters of credit	8,330,000	17,531,000
Overdraft privilege commitments	94,473,000	101,060,000
Fair Value [Member] | Level 3 [Member]
Financial assets:
Loans, net	2,555,297,000	2,379,155,000
Off-balance sheet:
Commitments	7,053,000	6,562,000
Standby letters of credit	83,000	175,000
Overdraft privilege commitments	945,000	1,011,000
Fair Value [Member] | Level 1 [Member]
Financial assets:
Cash and due from banks	94,305,000	93,150,000
Cash at Federal Reserve and other banks	209,156,000	517,578,000
Fair Value [Member] | Level 2 [Member]
Financial assets:
Securities held to maturity	732,208,000	688,779,000
Loans held for sale	1,873,000	3,579,000
Financial liabilities:
Deposits	3,630,129,000	3,380,486,000
Other borrowings	12,328,000	9,276,000
Junior subordinated debt	44,527,000	45,053,000
Carrying Amount [Member] | Level 3 [Member]
Financial assets:
Loans, net	2,486,926,000	2,282,524,000
Carrying Amount [Member] | Level 1 [Member]
Financial assets:
Cash and due from banks	94,305,000	93,150,000
Cash at Federal Reserve and other banks	209,156,000	517,578,000
Carrying Amount [Member] | Level 2 [Member]
Financial assets:
Securities held to maturity	726,530,000	676,426,000
Restricted equity securities	16,596,000	16,956,000
Loans held for sale	1,873,000	3,579,000
Financial liabilities:
Deposits	3,631,266,000	3,380,423,000
Other borrowings	12,328,000	9,276,000
Junior subordinated debt	$ 56,470,000	$ 56,272,000

TriCo Bancshares Condensed F147

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash and Cash equivalents	$ 303,461	$ 610,728	$ 598,368	$ 748,899
Other assets	48,591	51,735
Total assets	4,220,722	3,916,458
Liabilities and shareholders' equity Other liabilities	65,293	49,192
Junior subordinated debt	56,470	56,272
Total liabilities	3,768,606	3,498,286
Shareholders' equity:
Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 22,775,173 and 22,714,964 shares, respectively	247,587	244,318
Retained earnings	206,307	176,057
Accumulated other comprehensive loss, net	(1,778)	(2,203)
Total shareholders' equity	452,116	418,172	250,946	229,359
Total liabilities and shareholders' equity	4,220,722	3,916,458
Parent [Member]
Assets
Cash and Cash equivalents	2,565	2,229	$ 2,520	$ 2,511
Investment in Tri Counties Bank	504,655	470,797
Other assets	1,714	1,902
Total assets	508,934	474,928
Liabilities and shareholders' equity Other liabilities	348	484
Junior subordinated debt	56,470	56,272
Total liabilities	56,818	56,756
Shareholders' equity:
Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 22,775,173 and 22,714,964 shares, respectively	247,587	244,318
Retained earnings	206,307	176,057
Accumulated other comprehensive loss, net	(1,778)	(2,203)
Total shareholders' equity	452,116	418,172
Total liabilities and shareholders' equity	$ 508,934	$ 474,928

TriCo Bancshares Condensed F148

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets (Parenthetical) (Detail) - $ / shares	Dec. 31, 2015	Dec. 31, 2014	Aug. 21, 2007
Condensed Financial Statements, Captions [Line Items]
Common stock, par value
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	22,775,173	22,714,964
Common stock, shares outstanding	22,775,173	22,714,964	15,814,662
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Common stock, par value
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	22,775,173	22,714,964
Common stock, shares outstanding	22,775,173	22,714,964

TriCo Bancshare Condensed Finan

TriCo Bancshare Condensed Financial Statements (Parent Only) - Condensed Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Interest expense	$ 1,349	$ 1,339	$ 1,346	$ 1,382	$ 1,437	$ 1,082	$ 1,075	$ 1,087	$ 5,416	$ 4,681	$ 4,696
Income before income taxes	18,810	21,062	18,798	14,044	9,580	14,235	8,396	12,405	72,714	44,616	45,804
Equity in net income of Tri Counties Bank:
Income tax benefit	(7,388)	(8,368)	(7,432)	(5,708)	(3,930)	(6,001)	(3,537)	(5,040)	(28,896)	(18,508)	(18,405)
Net income	$ 11,422	$ 12,694	$ 11,366	$ 8,336	$ 5,650	$ 8,234	$ 4,859	$ 7,365	43,818	26,108	27,399
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Interest expense									(1,977)	(1,403)	(1,247)
Administration expense									(814)	(2,720)	(862)
Income before income taxes									(2,791)	(4,123)	(2,109)
Equity in net income of Tri Counties Bank:
Distributed									13,304	8,270	8,175
Undistributed									32,131	20,720	20,446
Income tax benefit									1,174	1,241	887
Net income									$ 43,818	$ 26,108	$ 27,399

TriCo Bancshare Condensed Fi150

TriCo Bancshare Condensed Financial Statements (Parent Only) - Condensed Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net income	$ 11,422	$ 12,694	$ 11,366	$ 8,336	$ 5,650	$ 8,234	$ 4,859	$ 7,365	$ 43,818	$ 26,108	$ 27,399
Other comprehensive (loss) income, net of tax:
Unrealized holding (losses) gains on securities arising during the period									(1,098)	(94)	(2,452)
Change in minimum pension liability									1,246	(4,114)	1,750
Change in joint beneficiary agreement liability									277	148	400
Other comprehensive (loss) income									425	(4,060)	(302)
Net income									44,243	22,048	27,097
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									43,818	26,108	27,399
Other comprehensive (loss) income, net of tax:
Unrealized holding (losses) gains on securities arising during the period									(1,098)	(94)	(2,452)
Change in minimum pension liability									1,246	(4,114)	1,750
Change in joint beneficiary agreement liability									277	148	400
Other comprehensive (loss) income									425	(4,060)	(302)
Net income									$ 44,243	$ 22,048	$ 27,097

TriCo Bancshare Condensed Fi151

TriCo Bancshare Condensed Financial Statements (Parent Only) - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities:
Net income	$ 11,422	$ 12,694	$ 11,366	$ 8,336	$ 5,650	$ 8,234	$ 4,859	$ 7,365	$ 43,818	$ 26,108	$ 27,399
Adjustments to reconcile net income to net cash provided by operating activities:
Equity compensation vesting expense									1,370	1,133	1,151
Net cash from operating activities									54,817	27,417	41,086
Financing activities:
Repurchase of common stock									(412)	(292)	(501)
Cash dividends paid - common									(11,849)	(7,807)	(6,745)
Net cash from financing activities									242,226	163,667	111,280
Net change in cash and cash equivalents									(307,267)	12,360	(150,531)
Cash and cash equivalents and beginning of year				610,728				598,368	610,728	598,368	748,899
Cash and cash equivalents at end of year	303,461				610,728				303,461	610,728	598,368
Parent [Member]
Operating activities:
Net income									43,818	26,108	27,399
Adjustments to reconcile net income to net cash provided by operating activities:
Undistributed equity in earnings of Tri Counties Bank									(32,131)	(20,720)	(20,446)
Equity compensation vesting expense									1,370	1,133	1,151
Equity compensation tax effect									68	(225)	(356)
Net change in other assets and liabilities									(1,120)	671	(1,100)
Net cash from operating activities									12,005	6,967	6,648
Financing activities:
Issuance of common stock through option exercise									660	616	251
Equity compensation tax effect									(68)	225	356
Repurchase of common stock									(412)	(292)	(501)
Cash dividends paid - common									(11,849)	(7,807)	(6,745)
Net cash from financing activities									(11,669)	(7,258)	(6,639)
Net change in cash and cash equivalents									336	(291)	9
Cash and cash equivalents and beginning of year				$ 2,229				$ 2,520	2,229	2,520	2,511
Cash and cash equivalents at end of year	$ 2,565				$ 2,229				$ 2,565	$ 2,229	$ 2,520

Regulatory Matters - Actual and

Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount		$ 279,311
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount		167,587
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount		$ 185,918
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio		10.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio		6.00%
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio		5.00%
Parent [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 474,436	$ 436,955
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	435,950	401,971
Tier 1 Capital (to Average Assets), Actual, Amount	$ 435,950	$ 401,971
Total Capital (to Risk Weighted Assets), Actual, Ratio	15.09%	15.63%
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.86%	14.38%
Tier 1 Capital (to Average Assets), Actual, Ratio	10.79%	10.80%
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount		$ 223,603
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount		111,801
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount		$ 148,819
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio		8.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio		4.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio		4.00%
Parent [Member] | Basel III Phase-in Schedule [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 251,555
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	188,666
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 161,562
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	6.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%
Parent [Member] | Basel III Fully Phased In [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 330,165
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	267,277
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 161,562
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	10.50%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.50%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%
Parent [Member] | Common Stock [Member]
Schedule of Capitalization [Line Items]
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	$ 385,747
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	12.27%
Parent [Member] | Common Stock [Member] | Basel III Phase-in Schedule [Member]
Schedule of Capitalization [Line Items]
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 141,499
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	4.50%
Parent [Member] | Common Stock [Member] | Basel III Fully Phased In [Member]
Schedule of Capitalization [Line Items]
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 220,110
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	7.00%
Tri Countries Bank [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 473,327	$ 433,286
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	434,841	398,325
Tier 1 Capital (to Average Assets), Actual, Amount	$ 434,841	$ 398,325
Total Capital (to Risk Weighted Assets), Actual, Ratio	15.06%	15.51%
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.84%	14.26%
Tier 1 Capital (to Average Assets), Actual, Ratio	10.76%	10.71%
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount		$ 223,449
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount		111,724
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount		$ 148,734
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio		8.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio		4.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio		4.00%
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 314,272
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	251,418
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 202,002
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%
Tri Countries Bank [Member] | Basel III Phase-in Schedule [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 251,418
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	188,563
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 161,601
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	6.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%
Tri Countries Bank [Member] | Basel III Fully Phased In [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 329,985
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	267,131
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 161,601
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	10.50%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.50%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%
Tri Countries Bank [Member] | Common Stock [Member]
Schedule of Capitalization [Line Items]
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	$ 434,841
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.84%
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 204,277
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%
Tri Countries Bank [Member] | Common Stock [Member] | Basel III Phase-in Schedule [Member]
Schedule of Capitalization [Line Items]
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 141,422
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	4.50%
Tri Countries Bank [Member] | Common Stock [Member] | Basel III Fully Phased In [Member]
Schedule of Capitalization [Line Items]
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 219,990
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	7.00%

Summary of Quarterly Results153

Summary of Quarterly Results of Operations (Unaudited) - Result of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans:
Discount accretion PCI - cash basis	$ 302	$ 445	$ 404	$ 172	$ 107	$ 290	$ 69	$ 203
Discount accretion PCI - other	1,392	1,090	907	1,274	919	822	811	984
Discount accretion PNCI	573	1,590	822	1,348	796	402	624	379
All other loan interest income	32,571	30,689	29,886	28,371	28,914	23,466	22,929	22,172
Total loan interest income	34,838	33,814	32,019	31,165	30,736	24,980	24,433	23,738
Debt securities, dividends and interest bearing cash at banks (not FTE)	7,652	7,518	7,848	6,560	5,671	4,151	3,985	3,421
Total interest and dividend income	42,490	41,332	39,867	37,725	36,407	29,131	28,418	27,159	$ 161,414	$ 121,115	$ 106,560
Interest expense	1,349	1,339	1,346	1,382	1,437	1,082	1,075	1,087	5,416	4,681	4,696
Net interest income	41,141	39,993	38,521	36,343	34,970	28,049	27,343	26,072	155,998	116,434	101,864
(Benefit from) provision for loan losses	(908)	(866)	(633)	197	(1,421)	(2,977)	1,708	(1,355)	(2,210)	(4,045)	(715)
Net interest income after provision for loan losses	42,049	40,859	39,154	36,146	36,391	31,026	25,635	27,427	158,208	120,479	102,579
Noninterest income	11,445	11,642	12,080	10,180	9,755	8,589	7,877	8,295	45,347	34,516	36,829
Noninterest expense	34,684	31,439	32,436	32,282	36,566	25,380	25,116	23,317	130,841	110,379	93,604
Income before income taxes	18,810	21,062	18,798	14,044	9,580	14,235	8,396	12,405	72,714	44,616	45,804
Income tax expense	7,388	8,368	7,432	5,708	3,930	6,001	3,537	5,040	28,896	18,508	18,405
Net income	$ 11,422	$ 12,694	$ 11,366	$ 8,336	$ 5,650	$ 8,234	$ 4,859	$ 7,365	$ 43,818	$ 26,108	$ 27,399
Per common share:
Net income (diluted)	$ 0.50	$ 0.55	$ 0.49	$ 0.36	$ 0.25	$ 0.50	$ 0.30	$ 0.45	$ 1.91	$ 1.46	$ 1.69
Dividends	$ 0.15	$ 0.13	$ 0.13	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11