TriCo Bancshares (TCBK) 10-Q 9 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 07, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	TCBK
Entity Registrant Name	TRICO BANCSHARES /
Entity Central Index Key	356,171
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		22,941,464

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Cash and due from banks	$ 86,815	$ 92,197
Cash at Federal Reserve and other banks	101,219	213,415
Cash and cash equivalents	188,034	305,612
Investment securities:
Available for sale	678,236	550,233
Held to maturity	536,567	602,536
Restricted equity securities	16,956	16,956
Loans held for sale	2,733	2,998
Total loans, net of unamortized deferred loan fees and discounts	2,931,613	2,759,593
Allowance for loan losses	(28,747)	(32,503)
Total loans, net	2,902,866	2,727,090
Foreclosed assets, net	3,071	3,986
Premises and equipment, net	54,995	48,406
Cash value of life insurance	97,142	95,912
Accrued interest receivable	12,656	12,027
Goodwill	64,311	64,311
Other intangible assets, net	5,513	6,563
Mortgage servicing rights	6,419	6,595
Other assets	86,936	74,743
Total assets	4,656,435	4,517,968
Deposits:
Noninterest-bearing demand	1,283,949	1,275,745
Interest-bearing	2,643,507	2,619,815
Total deposits	3,927,456	3,895,560
Accrued interest payable	867	818
Reserve for unfunded commitments	2,989	2,719
Other liabilities	62,850	67,364
Other borrowings	98,730	17,493
Junior subordinated debt	56,810	56,667
Total liabilities	4,149,702	4,040,621
Commitments and contingencies (Note 18)
Shareholders' equity:
Common stock, no par value: 50,000,000 shares authorized; issued and outstanding: 22,941,464 at September 30, 2017 22,867,802 at December 31, 2016	255,231	252,820
Retained earnings	256,114	232,440
Accumulated other comprehensive loss, net of tax	(4,612)	(7,913)
Total shareholders' equity	506,733	477,347
Total liabilities and shareholders' equity	$ 4,656,435	$ 4,517,968

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016	Aug. 21, 2007
Statement of Financial Position [Abstract]
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	22,941,464	22,867,802
Common stock, shares outstanding	22,941,464	22,867,802	15,814,662

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest and dividend income:
Loans, including fees	$ 37,268	$ 35,769	$ 108,600	$ 104,845
Investment securities:
Taxable	7,011	6,297	20,617	19,377
Tax exempt	1,041	978	3,124	2,850
Dividends	301	390	1,020	1,175
Interest bearing cash at Federal Reserve and other banks	292	275	1,080	846
Total interest and dividend income	45,913	43,709	134,441	129,093
Interest expense:
Deposits	1,028	875	2,896	2,611
Other borrowings	149	2	164	7
Junior subordinated debt	652	562	1,870	1,643
Total interest expense	1,829	1,439	4,930	4,261
Net interest income	44,084	42,270	129,511	124,832
Provision (Reversal of provision) for loan losses	765	(3,973)	(1,588)	(4,537)
Net interest income after reversal of provision loan losses	43,319	46,243	131,099	129,369
Noninterest income:
Service charges and fees	9,475	8,022	27,861	23,426
Gain on sale of loans	606	953	2,293	2,645
Commissions on sale of non-deposit investment products	672	747	1,984	1,890
Increase in cash value of life insurance	732	709	2,043	2,086
Gain on sale of investments securities	961		961
Other	484	635	2,401	2,054
Total noninterest income	12,930	11,066	37,543	32,101
Noninterest expense:
Salaries and related benefits	20,933	20,860	62,320	60,170
Other	16,289	16,556	46,628	49,264
Total noninterest expense	37,222	37,416	108,948	109,434
Income before income taxes	19,027	19,893	59,694	52,036
Provision for income taxes	7,130	7,694	22,129	19,758
Net income	$ 11,897	$ 12,199	$ 37,565	$ 32,278
Earnings per share:
Basic	$ 0.52	$ 0.53	$ 1.64	$ 1.42
Diluted	$ 0.51	$ 0.53	$ 1.62	$ 1.40

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 11,897	$ 13,589	$ 12,079	$ 12,533	$ 12,199	$ 9,405	$ 10,674	$ 37,565	$ 32,278
Other comprehensive (loss) income, net of tax:
Unrealized (losses) gains on available for sale securities arising during the period	(166)				(1,193)			3,137	6,514
Change in minimum pension liability	55				74			164	222
Change in joint beneficiary agreement liability					(1)				(5)
Other comprehensive (loss) income	(111)				(1,120)			3,301	6,731
Comprehensive income	$ 11,786				$ 11,079			$ 40,866	$ 39,009

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2015	$ 452,116	$ 247,587	$ 206,307	$ (1,778)
Beginning balance, shares at Dec. 31, 2015		22,775,173
Net income	32,278		32,278
Other comprehensive income	6,731			6,731
Stock option vesting	455	$ 455
RSU vesting	440	440
PSU vesting	183	183
Stock options exercised	2,908	$ 2,908
Stock options exercised, shares		132,700
RSUs released	0	$ 0	0	0
RSUs released, shares		20,529
Tax effect of stock option exercise	(183)	$ (183)
Tax effect of RSU release	1	1
Repurchase of common stock	(2,774)	$ (1,101)	(1,673)
Repurchase of common stock, shares		(101,125)
Dividends paid	(10,265)		(10,265)
Ending balance at Sep. 30, 2016	481,890	$ 250,290	226,647	4,953
Ending balance, shares at Sep. 30, 2016		22,827,277
Beginning balance at Dec. 31, 2015	452,116	$ 247,587	206,307	(1,778)
Beginning balance, shares at Dec. 31, 2015		22,775,173
Ending balance at Dec. 31, 2016	$ 477,347	$ 252,820	232,440	(7,913)
Ending balance, shares at Dec. 31, 2016	22,867,802	22,867,802
Beginning balance at Sep. 30, 2016	$ 481,890	$ 250,290	226,647	4,953
Beginning balance, shares at Sep. 30, 2016		22,827,277
Net income	12,533
Ending balance at Dec. 31, 2016	$ 477,347	$ 252,820	232,440	(7,913)
Ending balance, shares at Dec. 31, 2016	22,867,802	22,867,802
Net income	$ 37,565		37,565
Other comprehensive income	3,301			3,301
Stock option vesting	211	$ 211
RSU vesting	657	657
PSU vesting	316	316
Stock options exercised	$ 2,418	$ 2,418
Stock options exercised, shares	133,850	133,850
RSUs released	$ 0	$ 0	0	0
RSUs released, shares		28,397
PSUs released	0	$ 0	0	0
PSUs released, shares		18,805
Repurchase of common stock	(3,854)	$ (1,191)	(2,663)
Repurchase of common stock, shares		(107,390)
Dividends paid	(11,228)		(11,228)
Ending balance at Sep. 30, 2017	$ 506,733	$ 255,231	$ 256,114	$ (4,612)
Ending balance, shares at Sep. 30, 2017	22,941,464	22,941,464

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Dividends paid, per share	$ 0.49	$ 0.45
Retained Earnings [Member]
Dividends paid, per share	$ 0.49	$ 0.45

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net income	$ 37,565	$ 32,278
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	5,089	4,870
Amortization of intangible assets	1,050	1,017
Benefit from reversal of provision for loan losses	(1,588)	(4,537)
Amortization of investment securities premium, net	2,431	3,625
Gain on sale of investment securities	(961)
Originations of residential mortgage loans for resale	(83,907)	(101,206)
Proceeds from sale of residential mortgage loans originated for resale	85,846	97,056
Gain on sale of loans	(2,293)	(2,645)
Change in market value of mortgage servicing rights	795	2,198
Provision for losses on foreclosed assets	162	40
Gain on sale of foreclosed assets	(308)	(218)
Write down of fixed assets held for sale		716
Loss on disposal of fixed assets	61	52
Gain on sale of premises held for sale	(3)
Increase in cash value of life insurance	(2,043)	(2,086)
Life insurance proceeds in excess of cash value	(108)	(238)
Equity compensation vesting expense	1,184	1,078
Tax effect of equity compensation exercise or release		182
Change in:
Reserve for unfunded commitments	270	433
Interest receivable	(629)	(33)
Interest payable	49
Other assets and liabilities, net	3,155	6,302
Net cash from operating activities	45,817	38,884
Investing activities:
Proceeds from maturities of securities available for sale	46,646	47,722
Proceeds from maturities of securities held to maturity	64,969	83,665
Purchases of securities available for sale	(195,465)	(160,787)
Loan origination and principal collections, net	(174,914)	(198,366)
Loans purchased		(22,503)
Proceeds from sale of loans other than loans originated for sale		32,029
Proceeds from sale of other real estate owned	1,787	3,375
Proceeds from sale of premises and equipment		1,231
Proceeds from the sale of premises held for sale	3,338
Purchases of premises and equipment	(10,874)	(10,048)
Life insurance proceeds	649
Cash acquired in acquisition		156,316
Net cash used by investing activities	(263,864)	(67,366)
Financing activities:
Net increase in deposits	31,896	43,515
Net change in other borrowings	81,237	6,907
Tax effect of equity compensation exercise or release		(182)
Repurchase of common stock	(1,629)	(384)
Dividends paid	(11,228)	(10,265)
Exercise of stock options	193	518
Net cash provided by financing activities	100,469	40,109
Net change in cash and cash equivalents	(117,578)	11,627
Cash and cash equivalents and beginning of year	305,612	303,461
Cash and cash equivalents at end of period	188,034	315,088
Supplemental disclosure of noncash activities:
Unrealized gain (loss) on securities available for sale	5,411	11,240
Loans transferred to foreclosed assets	726	1,953
Fixed assets transferred to held for sale		1,934
Due from broker	25,757
Market value of shares tendered in-lieu of cash to pay for exercise of options, release of RSUs, and/or related taxes	3,854	2,774
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	4,881	4,261
Cash paid for income taxes	$ 15,450	15,515
Assets acquired in acquisition		161,231
Liabilities assumed in acquisition		$ 161,231

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
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” or “we”) 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. The Bank operates from 57 traditional branches and 9 in-store 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 $1,706,000 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. 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. 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 the three months ended September 30, 2017, the Company sold $24,796,000 of available for sale classified investment securities for $25,757,000 realizing a gain of $961,000. During the six months ended June 30, 2017 and throughout 2016, 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 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 original 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 specific reserve allocation within the allowance for loan losses. 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 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 re-graded Re-grading 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. 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 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality 310-30, 310-30 310-30 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, 310-20, 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 shorter of the estimated useful lives of the related assets or lease terms. Asset lives range from 3-10 15-40 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 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. Low Income Housing Tax Credits The Company accounts for low income housing tax credits and the related qualified affordable housing projects using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). Upon entering into a qualified affordable housing project, the Company records, in other liabilities, the entire amount that it has agreed to invest in the project, and an equal amount, in other assets, representing its investment in the project. As the Company disburses cash to satisfy its investment obligation, other liabilities are reduced. Over time, as the tax credits and other tax benefits of the project are realized by the Company, the investment recorded in other assets is reduced using the proportional amortization method. 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 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 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 During the three months ended September 30, 2017, the Company changed its classification of 1 st nd non-owner 1-4 0.10%-0.20% Recent Accounting Pronouncements FASB Accounting Standards Update (ASU) No.2014-09, Revenue from Contracts with Customers (Topic 606): 2014-09 2014-09 2014-09 FASB issued Accounting Standard Update (ASU) No. 2016-02, Leases (Topic 842) ASU 2016-2, on-balance ASU 2016-02 2016-02 FASB issued Accounting Standard Update (ASU) No. 2016-09 , Compensation – Stock Compensation (Topic 718). ASU 2016-09, ASU 2016-09 FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326) 2016-13 2016-13, 2016-13 available-for-sale 2016-13 2016-13 2016-13 2016-13 one-time one-time FASB issued ASU No. 2016-18, Statement of Cash Flows - Restricted Cash (Topic 230). ASU 2016-18 beginning-of-period end-of-period ASU 2016-18 FASB issued ASU No. 2017-01, Business Combinations - Clarifying the Definition of a Business (Topic 805). ASU 2017-01 ASU 2017-01 ASU 2017-01 FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment (Topic 350). 2017-04 ASU 2017-04 FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715). 2017-07 ASU 2017-07 FASB issued ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Topic 310). ASU 2017-08 non-pooled ASU 2017-08 ASU 2017-08 2016-08 FASB issued ASU 2017-09, Compensation - Stock Compensation (Topic 718). ASU 2017-09 ASU 2017-09, ASU 2017-09

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Business Combinations	Note 2 - Business Combinations On March 18, 2016, the Bank completed its acquisition of three branch banking offices from Bank of America originally announced October 28, 2015. The acquired branches are located in Arcata, Eureka and Fortuna in Humboldt County on the North Coast of California, and have significant overlap compared to the Company’s then-existing Northern California customer base and branch locations. Beginning on March 18, 2016, the revenue and expenses from the operations of the acquired branches are included in the results of the Company. The Bank paid a premium of $3,204,000 for deposit relationships with balances of $161,231,000 and loans with balances of $289,000. The assets acquired and liabilities assumed in the acquisition of these branches 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 March 18, 2016 acquisition date, and the results of operations of the acquired branches 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 the acquired branches. $849,000 of the goodwill is deductible for income tax purposes because the acquisition was accounted for as a purchase of assets and assumption of liabilities for tax purposes. 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 acquisition of three branch banking offices and certain deposits from Bank of America on March 18, 2016: (in thousands) March 18, 2016 Fair value of consideration transferred: Cash consideration $ 3,204 Total fair value of consideration transferred 3,204 Asset acquired: Cash and cash equivalents 159,520 Loans 289 Premises and equipment 1,590 Core deposit intangible 2,046 Other assets 141 Total assets acquired 163,586 Liabilities assumed: Deposits 161,231 Total liabilities assumed 161,231 Total net assets acquired 2,355 Goodwill recognized $ 849 A summary of the cash paid and estimated fair value adjustments resulting in the goodwill recorded in the acquisition of three branch banking offices and certain deposits from Bank of America on March 18, 2016 are presented below: March 18, 2016 (in thousands) Cash paid $ 3,204 Cost basis net assets acquired — Fair value adjustments: Loans — Premises and Equipment (309 ) Core deposit intangible (2,046 ) Goodwill $ 849 As part of the acquisition of three branch banking offices from Bank of America, the Company performed a valuation of premises and equipment acquired. This valuation resulted in a $309,000 increase in the net book value of the land and buildings acquired, and was based on current appraisals of such land and buildings. The Company recognized a core deposit intangible of $2,046,000 related to the acquisition of the core deposits. The recorded core deposit intangibles represented approximately 1.50% of the core deposits acquired and will be amortized over their estimated useful lives of 7 years. A valuation of the time deposits acquired 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.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2017
Investments Schedule [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: September 30, 2017 Amortized Gross Gross Estimated (in thousands) Securities Available for Sale Obligations of U.S. government corporations and agencies $ 557,060 $ 1,321 $ (4,319 ) $ 554,062 Obligations of states and political subdivisions 121,635 1,182 (1,600 ) 121,217 Marketable equity securities 3,000 — (43 ) 2,957 Total securities available for sale $ 681,695 $ 2,503 $ (5,962 ) $ 678,236 Securities Held to Maturity Obligations of U.S. government corporations and agencies $ 521,999 $ 6,837 $ (1,442 ) $ 527,394 Obligations of states and political subdivisions 14,568 211 (50 ) 14,729 Total securities held to maturity $ 536,567 $ 7,048 $ (1,492 ) $ 542,123 December 31, 2016 Amortized Gross Gross Estimated (in thousands) Securities Available for Sale Obligations of U.S. government corporations and agencies $ 434,357 $ 1,949 $ (6,628 ) $ 429,678 Obligations of states and political subdivisions 121,746 267 (4,396 ) 117,617 Marketable equity securities 3,000 — (62 ) 2,938 Total securities available for sale $ 559,103 $ 2,216 $ (11,086 ) $ 550,233 Securities Held to Maturity Obligations of U.S. government corporations and agencies $ 587,982 $ 5,001 $ (4,199 ) $ 588,784 Obligations of states and political subdivisions 14,554 56 (191 ) 14,419 Total securities held to maturity $ 602,536 $ 5,057 $ (4,390 ) $ 603,203 During the three months ended September 30, 2017 investment securities with cost basis of $25,757,000 were sold. No investment securities were sold during the six months ended June 30, 2017 or the nine months ended September 30, 2016. Investment securities with an aggregate carrying value of $268,076,000 and $292,737,000 at September 30, 2017 and December 31, 2016, 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 September 30, 2017 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 September 30, 2017, obligations of U.S. government corporations and agencies with a cost basis totaling $1,079,060,000 consist almost entirely of residential real estate 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 September 30, 2017, the Company estimates the average remaining life of these mortgage-backed securities issued by U.S. government corporations and agencies to be approximately 5.6 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 Cost Fair Value Cost Fair Value Due in one year $ 2 $ 2 — — Due after one year through five years 206 206 $ 1,199 $ 1,233 Due after five years through ten years 2,223 2,279 4,098 4,165 Due after ten years 679,264 675,749 531,270 536,725 Totals $ 681,695 $ 678,236 $ 536,567 $ 542,123 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 September 30, 2017 Value Loss Value Loss Value Loss (in thousands) Securities Available for Sale: Obligations of U.S. government corporations and agencies $ 365,252 $ (4,319 ) — — $ 365,252 $ (4,319 ) Obligations of states and political subdivisions 31,937 (903 ) $ 8,905 $ (697 ) 40,842 (1,600 ) Marketable equity securities 2,957 (43 ) — — 2,957 (43 ) Total securities available-for-sale $ 400,146 $ (5,265 ) $ 8,905 $ (697 ) $ 409,051 $ (5,962 ) Securities Held to Maturity: Obligations of U.S. government corporations and agencies $ 133,453 $ (1,442 ) — — $ 133,453 $ (1,442 ) Obligations of states and political subdivisions 3,197 (50 ) — — 3,179 (50 ) Total securities held-to-maturity $ 136,650 $ (1,492 ) — — $ 136,650 $ (1,492 ) Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized December 31, 2016 Value Loss Value Loss Value Loss (in thousands) Securities Available for Sale: Obligations of U.S. government corporations and agencies $ 370,389 $ (6,628 ) — — $ 370,389 $ (6,628 ) Obligations of states and political subdivisions 90,825 (4,396 ) — — 90,825 (4,396 ) Marketable equity securities 2,938 (62 ) — — 2,938 (62 ) Total securities available-for-sale $ 464,152 $ (11,086 ) — — $ 464,152 $ (11,086 ) Securities Held to Maturity: Obligations of U.S. government corporations and agencies $ 280,497 $ (4,199 ) — — $ 280,497 $ (4,199 ) Obligations of states and political subdivisions 9,984 (191 ) — — 9,984 (191 ) Total securities held-to-maturity $ 290,481 $ (4,390 ) — — $ 290,481 $ (4,390 ) 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 September 30, 2017, 51 debt securities representing obligations of U.S. government corporations and agencies had unrealized losses with aggregate depreciation of (1.14%) 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 September 30, 2017, 48 debt securities representing obligations of states and political subdivisions had unrealized losses with aggregate depreciation of (3.61%) from the Company’s amortized cost basis. Marketable equity securities: At September 30, 2017, 2 marketable equity securities had unrealized losses with aggregate depreciation of (1.43%) from the Company’s amortized cost basis. The Company has the intent and ability to hold these securities for the foreseeable future and no credit quality deterioration associated with these securities has been identified, therefore, management does not believe that they are other than temporarily impaired.

Loans

Loans	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans	Note 4 – Loans A summary of loan balances follows (in thousands): September 30, 2017 PCI - PCI - Originated PNCI Cash basis Other Total Mortgage loans on real estate: Residential 1-4 $ 321,852 $ 67,815 — $ 1,405 $ 391,072 Commercial 1,588,790 206,841 — 8,171 1,803,802 Total mortgage loan on real estate 1,910,642 274,656 — 9,576 2,194,874 Consumer: Home equity lines of credit 269,470 17,084 $ 2,209 743 289,506 Home equity loans 41,486 2,810 — 737 45,033 Other 24,435 2,302 — 44 26,781 Total consumer loans 335,391 22,196 2,209 1,524 361,320 Commercial 215,946 8,838 — 2,695 227,479 Construction: Residential 75,108 12 — — 75,120 Commercial 69,452 3,368 — — 72,820 Total construction 144,560 3,380 — — 147,940 Total loans, net of deferred loan fees and discounts $ 2,606,539 $ 309,070 $ 2,209 $ 13,795 $ 2,931,613 Total principal balance of loans owed, net of charge-offs $ 2,614,521 $ 316,657 $ 6,519 $ 17,626 $ 2,955,323 Unamortized net deferred loan fees (7,982 ) — — — (7,982 ) Discounts to principal balance of loans owed, net of charge-offs — (7,587 ) (4,310 ) (3,831 ) (15,728 ) Total loans, net of deferred loan fees and discounts $ 2,606,539 $ 309,070 $ 2,209 $ 13,795 $ 2,931,613 Noncovered loans $ 2,606,539 $ 309,070 $ 2,209 $ 13,795 $ 2,931,613 Covered loans — — — — — Total loans, net of deferred loan fees and discounts $ 2,606,539 $ 309,070 $ 2,209 $ 13,795 $ 2,931,613 Allowance for loan losses $ (27,417 ) $ (1,043 ) $ (12 ) $ (275 ) $ (28,747 ) A summary of loan balances follows (in thousands): December 31, 2016 PCI - PCI - Originated PNCI Cash basis Other Total Mortgage loans on real estate: Residential 1-4 $ 284,539 $ 82,335 — $ 1,469 $ 368,343 Commercial 1,425,828 246,491 — 12,802 1,685,121 Total mortgage loan on real estate 1,710,367 328,826 — 14,271 2,053,464 Consumer: Home equity lines of credit 263,590 21,765 $ 2,983 1,377 289,715 Home equity loans 40,736 3,764 — 1,682 46,182 Other 28,167 2,534 — 65 30,766 Total consumer loans 332,493 28,063 2,983 3,124 366,663 Commercial 200,735 12,321 — 3,991 217,047 Construction: Residential 54,613 141 — 675 55,429 Commercial 58,119 8,871 — — 66,990 Total construction 112,732 9,012 — 675 122,419 Total loans, net of deferred loan fees and discounts $ 2,356,327 $ 378,222 $ 2,983 $ 22,061 $ 2,759,593 Total principal balance of loans owed, net of charge-offs $ 2,363,243 $ 388,139 $ 8,280 $ 25,650 $ 2,785,312 Unamortized net deferred loan fees (6,916 ) — — — (6,916 ) Discounts to principal balance of loans owed, net of charge-offs — (9,917 ) (5,297 ) (3,589 ) (18,803 ) Total loans, net of unamortized deferred loan fees and discounts $ 2,356,327 $ 378,222 $ 2,983 $ 22,061 $ 2,759,593 Noncovered loans $ 2,356,327 $ 378,222 $ 2,983 $ 18,885 $ 2,756,417 Covered loans — — — 3,176 3,176 Total loans, net of unamortized deferred loan fees and discounts $ 2,356,327 $ 378,222 $ 2,983 $ 22,061 $ 2,759,593 Allowance for loan losses $ (28,141 ) $ (1,665 ) $ (17 ) $ (2,680 ) $ (32,503 ) The following is a summary of the change in accretable yield for PCI – other loans during the periods indicated (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Change in accretable yield: Balance at beginning of period $ 7,956 $ 11,775 $ 10,348 $ 13,255 Accretion to interest income (594 ) (961 ) (2,554 ) (3,068 ) Reclassification (to) from nonaccretable difference (2,893 ) (160 ) (3,325 ) 467 Balance at end of period $ 4,469 $ 10,654 $ 4,469 $ 10,654

Allowance for Loan Losses

Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2017
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 – Three Months Ended September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Beginning balance $ 2,495 $ 10,119 $ 6,156 $ 2,354 $ 645 $ 4,729 $ 1,179 $ 466 $ 28,143 Charge-offs (60 ) (20 ) (14 ) (94 ) (349 ) (291 ) (33 ) — (861 ) Recoveries — 238 189 121 91 61 — — 700 (Benefit) provision (217 ) 1,033 (610 ) (390 ) 203 303 284 159 765 Ending balance $ 2,218 $ 11,370 $ 5,721 $ 1,991 $ 590 $ 4,802 $ 1,430 $ 625 $ 28,747 Allowance for Loan Losses – Nine Months Ended September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Beginning balance $ 2,748 $ 11,517 $ 7,044 $ 2,644 $ 622 $ 5,831 $ 1,417 $ 680 $ 32,503 Charge-offs (60 ) (170 ) (98 ) (331 ) (831 ) (1,188 ) (1,104 ) — (3,782 ) Recoveries — 365 487 146 300 315 — 1 1,614 (Benefit) provision (470 ) (342 ) (1,712 ) (468 ) 499 (156 ) 1,117 (56 ) (1,588 ) Ending balance $ 2,218 $ 11,370 $ 5,721 $ 1,991 $ 590 $ 4,802 $ 1,430 $ 625 $ 28,747 Ending balance: Individ. evaluated for impairment $ 240 $ 73 $ 363 $ 111 $ 77 $ 1,276 — — $ 2,140 Loans pooled for evaluation $ 1,978 $ 11,022 $ 5,347 $ 1,879 $ 513 $ 3,526 $ 1,430 $ 625 $ 26,320 Loans acquired with deteriorated credit quality — $ 275 $ 12 — — — — — $ 287 Loans, net of unearned fees – As of September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Ending balance: Total loans $ 391,072 $ 1,803,802 $ 289,506 $ 45,033 $ 26,781 $ 227,479 $ 75,120 $ 72,820 $ 2,931,613 Individ. evaluated for impairment $ 5,027 $ 19,788 $ 2,219 $ 1,842 $ 267 $ 2,938 $ 144 — $ 32,225 Loans pooled for evaluation $ 384,640 $ 1,775,843 $ 284,335 $ 42,454 $ 26,470 $ 221,846 $ 74,976 $ 72,820 $ 2,883,384 Loans acquired with deteriorated credit quality $ 1,405 $ 8,171 $ 2,952 $ 737 $ 44 $ 2,695 — — $ 16,004 Allowance for Loan Losses – Year Ended December 31, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Beginning balance $ 2,896 $ 11,015 $ 11,253 $ 3,177 $ 688 $ 5,271 $ 899 $ 812 $ 36,011 Charge-offs (321 ) (827 ) (585 ) (219 ) (823 ) (455 ) — — (3,230 ) Recoveries 880 920 2,317 590 449 404 54 78 5,692 (Benefit) provision (694 ) 395 (5,940 ) (903 ) 308 611 463 (210 ) (5,970 ) Ending balance $ 2,761 $ 11,503 $ 7,045 $ 2,645 $ 622 $ 5,831 $ 1,416 $ 680 $ 32,503 Ending balance: Individ. evaluated for impairment $ 258 $ 4 $ 411 $ 215 $ 28 $ 1,130 — — $ 2,046 Loans pooled for evaluation $ 2,317 $ 10,050 $ 6,617 $ 2,366 $ 594 $ 3,765 $ 1,371 $ 680 $ 27,760 Loans acquired with deteriorated credit quality $ 186 $ 1,449 $ 17 $ 64 — $ 936 $ 45 — $ 2,697 Loans, net of unearned fees – As of December 31, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Ending balance: Total loans $ 368,343 $ 1,685,121 $ 289,715 $ 46,182 $ 30,766 $ 217,047 $ 55,429 $ 66,990 $ 2,759,593 Individ. evaluated for impairment $ 4,094 $ 15,081 $ 3,196 $ 1,508 $ 154 $ 4,096 $ 11 — $ 28,140 Loans pooled for evaluation $ 362,780 $ 1,657,238 $ 282,159 $ 42,992 $ 30,547 $ 208,960 $ 54,743 $ 66,990 $ 2,706,409 Loans acquired with deteriorated credit quality $ 1,469 $ 12,802 $ 4,360 $ 1,682 $ 65 $ 3,991 $ 675 — $ 25,044 Allowance for Loan Losses – Three Months Ended September 30, 2016 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Beginning balance $ 3,081 $ 11,934 $ 9,203 $ 3,057 — $ 696 $ 5,265 $ 1,321 $ 952 $ 35,509 Charge-offs (50 ) — (122 ) (25 ) — (160 ) (307 ) — — (664 ) Recoveries 391 20 1,580 429 — 107 85 — — 2,612 (Benefit) provision (653 ) (378 ) (2,261 ) (360 ) — 24 199 (16 ) (528 ) (3,973 ) Ending balance $ 2,769 $ 11,576 $ 8,400 $ 3,101 — $ 667 $ 5,242 $ 1,305 $ 424 $ 33,484 Allowance for Loan Losses – Nine Months Ended September 30, 2016 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Beginning balance $ 2,896 $ 11,015 $ 11,253 $ 3,177 — $ 688 $ 5,271 $ 899 $ 812 $ 36,011 Charge-offs (212 ) (793 ) (450 ) (118 ) — (600 ) (421 ) — — (2,594 ) Recoveries 618 902 1,921 501 — 338 323 — 1 4,604 (Benefit) provision (533 ) 452 (4,324 ) (459 ) — 241 69 406 (389 ) (4,537 ) Ending balance $ 2,769 $ 11,576 $ 8,400 $ 3,101 — $ 667 $ 5,242 $ 1,305 $ 424 $ 33,484 Ending balance: Individ. evaluated for impairment $ 418 $ 644 $ 511 $ 311 — $ 72 $ 822 — — $ 2,778 Loans pooled for evaluation $ 2,157 $ 9,493 $ 7,864 $ 2,730 — $ 595 $ 3,426 $ 1,257 $ 424 $ 27,946 Loans acquired with deteriorated credit quality $ 181 $ 1,453 $ 25 $ 59 — — $ 994 $ 48 — $ 2,760 Loans, net of unearned fees – As of September 30, 2016 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Ending balance: Total loans $ 368,223 $ 1,625,897 $ 301,884 $ 48,314 — $ 31,611 $ 217,110 $ 57,892 $ 61,295 $ 2,712,226 Individ. evaluated for impairment $ 5,414 $ 14,706 $ 3,820 $ 2,650 — $ 278 $ 2,397 $ 11 — $ 29,276 Loans pooled for evaluation $ 361,336 $ 1,597,876 $ 292,833 $ 43,552 — $ 31,272 $ 210,565 $ 57,338 $ 61,295 $ 2,656,067 Loans acquired with deteriorated credit quality $ 1,473 $ 13,315 $ 5,231 $ 2,112 — $ 61 $ 4,148 $ 543 — $ 26,883 As part of the on-going (iii) non-performing 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 September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Originated loans: Pass $ 317,577 $ 1,553,178 $ 266,066 $ 38,885 $ 23,978 $ 209,215 $ 75,000 $ 60,921 $ 2,544,820 Special mention 1,831 13,484 2,196 815 368 3,390 — 8,531 30,615 Substandard 2,444 22,128 1,208 1,786 89 3,341 108 — 31,104 Loss — — — — — — — — — Total originated $ 321,852 $ 1,588,790 $ 269,470 $ 41,486 $ 24,435 $ 215,946 $ 75,108 $ 69,452 $ 2,606,539 PNCI loans: Pass $ 65,700 $ 191,518 $ 15,832 $ 2,534 $ 2,257 $ 8,832 $ 12 $ 3,368 $ 290,053 Special mention 223 13,155 452 209 39 — — — 14,078 Substandard 1,892 2,168 800 67 6 6 — — 4,939 Loss — — — — — — — — — Total PNCI $ 67,815 $ 206,841 $ 17,084 $ 2,810 $ 2,302 $ 8,838 $ 12 $ 3,368 $ 309,070 PCI loans $ 1,405 $ 8,171 $ 2,952 $ 737 $ 44 $ 2,695 — — $ 16,004 Total loans $ 391,072 $ 1,803,802 $ 289,506 $ 45,033 $ 26,781 $ 227,479 $ 75,120 $ 72,820 $ 2,931,613 Credit Quality Indicators – As of December 31, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Originated loans: Pass $ 278,635 $ 1,399,936 $ 258,024 $ 37,844 $ 27,542 $ 190,902 $ 54,602 $ 57,808 $ 2,305,293 Special mention 2,992 14,341 2,518 891 385 6,133 — 311 27,571 Substandard 2,912 11,551 3,048 2,001 240 3,700 11 — 23,463 Loss — — — — — — — — — Total originated $ 284,539 $ 1,425,828 $ 263,590 $ 40,736 $ 28,167 $ 200,735 $ 54,613 $ 58,119 $ 2,356,327 PNCI loans: Pass $ 79,000 $ 233,326 $ 20,442 $ 3,506 $ 2,437 $ 12,320 $ 141 $ 8,871 $ 360,043 Special mention 1,849 5,925 509 173 92 1 — — 8,549 Substandard 1,486 7,240 814 85 5 — — — 9,630 Loss — — — — — — — — — Total PNCI $ 82,335 $ 246,491 $ 21,765 $ 3,764 $ 2,534 $ 12,321 $ 141 $ 8,871 $ 378,222 PCI loans $ 1,469 $ 12,802 $ 4,360 $ 1,682 $ 65 $ 3,991 $ 675 — $ 25,044 Total loans $ 368,343 $ 1,685,121 $ 289,715 $ 46,182 $ 30,766 $ 217,047 $ 55,429 $ 66,990 $ 2,759,593 Consumer loans, whether unsecured or secured by real estate, automobiles, or other personal property, are susceptible to three primary risks; non-payment non-payment 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 Commercial real estate loans generally fall into two categories, owner-occupied and non-owner non-owner Construction loans, whether owner occupied or non-owner 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 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 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 September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Originated loan balance: Past due: 30-59 $ 721 $ 2,241 $ 695 $ 662 $ 150 $ 362 — — $ 4,831 60-89 403 793 299 — 83 1 — — 1,579 > 90 Days 343 744 82 468 1 407 — — 2,045 Total past due 1,467 3,778 1,076 1,130 234 770 — — 8,455 Current 320,385 1,585,012 268,394 40,356 24,201 215,176 75,108 69,452 2,598,084 Total orig. loans $ 321,852 $ 1,588,790 $ 269,470 $ 41,486 $ 24,435 $ 215,946 $ 75,108 $ 69,452 $ 2,606,539 > 90 Days and still accruing — — — — — — — — — Nonaccrual loans $ 1,037 $ 6,954 $ 534 $ 1,199 $ 13 $ 1,951 — — $ 11,688 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 September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total PNCI loan balance: Past due: 30-59 $ 39 — $ 100 $ 27 $ 12 — — — $ 178 60-89 159 1,599 129 18 5 1 — — 1,911 > 90 Days 1,021 — — — — 6 — — $ 1,027 Total past due 1,219 1,599 229 45 17 7 — — 3,116 Current 66,596 205,242 16,855 2,765 2,285 8,831 12 3,368 305,954 Total PNCI loans $ 67,815 $ 206,841 $ 17,084 $ 2,810 $ 2,302 $ 8,838 $ 12 $ 3,368 $ 309,070 > 90 Days and still accruing — — — — — — — — — Nonaccrual loans $ 1,089 $ 1,599 $ 276 $ 50 $ 6 $ 6 — — $ 3,026 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, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Originated loan balance: Past due: 30-59 $ 552 $ 317 $ 754 $ 646 $ 16 $ 1,148 $ 921 — $ 4,354 60-89 269 1,387 — 395 30 84 — $ 421 2,586 > 90 Days — 216 687 184 15 634 11 — 1,747 Total past due 821 1,920 1,441 1,225 61 1,866 932 421 8,687 Current 283,718 1,423,908 262,149 39,511 28,106 198,869 53,681 57,698 2,347,640 Total orig. loans $ 284,539 $ 1,425,828 $ 263,590 $ 40,736 $ 28,167 $ 200,735 $ 54,613 $ 58,119 $ 2,356,327 > 90 Days and still accruing — — — — — — — — — Nonaccrual loans $ 255 $ 7,651 $ 1,211 $ 803 $ 33 $ 2,930 $ 11 — $ 12,894 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, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total PNCI loan balance: Past due: 30-59 $ 1,510 $ 73 $ 274 $ 39 — — — — $ 1,896 60-89 — — — — — — — — — > 90 Days 21 81 589 13 — — — — 704 Total past due 1,531 154 863 52 — — — — 2,600 Current 80,804 246,337 20,902 3,712 $ 2,534 $ 12,321 $ 141 $ 8,871 375,622 Total PNCI loans $ 82,335 $ 246,491 $ 21,765 $ 3,764 $ 2,534 $ 12,321 $ 141 $ 8,871 $ 378,222 > 90 Days and still accruing — — — — — — — — — Nonaccrual loans $ 194 $ 1,826 $ 742 $ 67 $ 5 — — — $ 2,834 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 original 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, or for the Nine Months Ended, September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 1,777 $ 17,039 $ 1,108 $ 1,470 $ 3 $ 884 $ 144 — $ 22,425 Unpaid principal $ 1,819 $ 17,493 $ 1,209 $ 1,892 $ 47 $ 1,139 $ 144 — $ 23,743 Average recorded Investment $ 1,734 $ 15,092 $ 1,294 $ 1,034 $ 9 $ 823 $ 78 — $ 20,064 Interest income Recognized $ 51 $ 474 $ 25 $ 25 ($ 25 ) $ 16 $ 7 — $ 573 With an allowance recorded: Recorded investment $ 1,644 $ 1,150 $ 110 $ 199 $ 11 $ 2,048 — — $ 5,162 Unpaid principal $ 1,670 $ 1,150 $ 115 $ 199 $ 12 $ 2,123 — — $ 5,269 Related allowance $ 167 $ 73 $ 33 $ 13 $ 7 $ 1,270 — — $ 1,563 Average recorded Investment $ 1,508 $ 898 $ 270 $ 342 $ 14 $ 2,691 — — $ 5,723 Interest income Recognized $ 39 $ 40 — $ 7 — $ 53 — — $ 139 Impaired PNCI Loans – As of, or for the Nine Months Ended, September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 1,356 $ 1,599 $ 394 $ 50 — — — — $ 3,399 Unpaid principal $ 1,384 $ 1,869 $ 413 $ 62 — — — — $ 3,728 Average recorded Investment $ 910 $ 1,712 $ 564 $ 59 $ 2 — — — $ 3,247 Interest income Recognized $ 17 — $ 8 — — — — — $ 25 With an allowance recorded: Recorded investment $ 250 — $ 607 $ 123 $ 253 $ 6 — — $ 1,239 Unpaid principal $ 250 — $ 607 $ 123 $ 253 $ 6 — — $ 1,239 Related allowance $ 73 — $ 328 $ 99 $ 71 $ 6 — — $ 577 Average recorded Investment $ 255 $ 66 $ 579 $ 62 $ 185 $ 3 — — $ 1,150 Interest income Recognized $ 7 — $ 20 $ 5 $ 8 — — — $ 40 Impaired Originated Loans – As of December 31, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 1,821 $ 12,897 $ 1,480 $ 715 $ 15 $ 762 $ 11 — $ 17,701 Unpaid principal $ 1,829 $ 13,145 $ 1,561 $ 1,135 $ 29 $ 926 $ 16 — $ 18,641 Average recorded Investment $ 2,853 $ 20,003 $ 2,221 $ 831 $ 17 $ 669 $ 7 — $ 26,601 Interest income Recognized $ 92 $ 570 $ 40 $ 6 $ 1 $ 48 — — $ 757 With an allowance recorded: Recorded investment $ 1,551 $ 357 $ 430 $ 594 $ 19 $ 3,334 — — $ 6,285 Unpaid principal $ 1,552 $ 357 $ 440 $ 596 $ 19 $ 3,385 — — $ 6,349 Related allowance $ 180 $ 4 $ 110 $ 107 $ 13 $ 1,130 — — $ 1,544 Average recorded Investment $ 1,779 $ 888 $ 1,076 $ 634 $ 9 $ 2,714 — — $ 7,100 Interest income Recognized $ 65 $ 22 $ 9 $ 31 $ 2 $ 77 — — $ 206 Impaired PNCI Loans – As of December 31, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 463 $ 1,826 $ 735 $ 67 $ 3 — — — $ 3,094 Unpaid principal $ 486 $ 2,031 $ 746 $ 74 $ 4 — — — $ 3,341 Average recorded Investment $ 669 $ 1,479 $ 594 $ 69 $ 18 $ 1 — $ 245 $ 3,075 Interest income Recognized $ 7 — $ 9 $ 1 — — — — $ 17 With an allowance recorded: Recorded investment $ 259 — $ 551 $ 132 $ 118 — — — $ 1,060 Unpaid principal $ 259 — $ 551 $ 132 $ 118 — — — $ 1,060 Related allowance $ 79 — $ 300 $ 108 $ 15 — — — $ 502 Average recorded Investment $ 130 $ 1,374 $ 579 $ 85 $ 176 — — — $ 2,344 Interest income Recognized $ 10 — $ 27 $ 7 $ 5 — — — $ 49 Impaired Originated Loans – As of, or for the Nine Months Ended, September 30, 2016 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 $ 2,392 $ 7,011 $ 1,888 $ 1,360 — $ 7 $ 574 $ 11 — $ 13,243 Unpaid principal $ 3,083 $ 7,286 $ 2,318 $ 1,979 — $ 11 $ 749 $ 16 — $ 15,442 Average recorded Investment $ 3,139 $ 17,059 $ 2,425 $ 1154 $ 1 $ 12 $ 575 $ 7 — $ 24,372 Interest income Recognized $ 63 $ 232 $ 26 $ 9 — — $ 26 — — $ 356 With an allowance recorded: Recorded investment $ 2,613 $ 5,820 $ 923 $ 1,059 — $ 8 $ 1,823 — — $ 12,246 Unpaid principal $ 2,701 $ 5,843 $ 931 $ 1,115 — $ 8 $ 1,869 — — $ 12,467 Related allowance $ 381 $ 644 $ 263 $ 201 — $ 3 $ 822 — — $ 2,314 Average recorded Investment $ 2,309 $ 3,620 $ 1,324 $ 866 — $ 4 $ 1,959 — — $ 10,082 Interest income Recognized $ 68 $ 216 $ 16 $ 36 — — $ 55 — — $ 391 Impaired PNCI Loans – As of, or for the Nine Months Ended, September 30, 2016 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 $ 474 $ 1,874 $ 502 $ 97 — $ 6 — — — $ 2,953 Unpaid principal $ 492 $ 2,048 $ 573 $ 103 — $ 7 — — — $ 3,223 Average recorded Investment $ 674 $ 1,503 $ 478 $ 84 — $ 19 $ 1 — $ 245 $ 3,004 Interest income Recognized $ 7 — $ 2 $ 1 — — — — — $ 10 With an allowance recorded: Recorded investment $ 263 — $ 507 $ 134 — $ 257 — — — $ 1,161 Unpaid principal $ 263 — $ 507 $ 134 — $ 257 — — — $ 1,161 Related allowance $ 81 — $ 248 $ 109 — $ 69 — — — $ 507 Average recorded Investment $ 131 $ 1,374 $ 557 $ 86 — $ 246 — — — $ 2,394 Interest income Recognized $ 7 — $ 16 $ 5 — $ 8 — — — $ 36 At September 30, 2017, $13,352,000 of originated loans were TDR and classified as impaired. The Company had obligations to lend additional $209,000 on these TDR as of September 30, 2017. At September 30, 2017, $1,611,000 of PNCI loans were TDR and classified as impaired. The Company had obligations to lend $3,000 of additional funds on these TDR as of September 30, 2017. At December 31, 2016, $12,371,000 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, 2016. At December 31, 2016, $1,324,000 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, 2016. At September 30, 2016, $14,882,000 of originated loans were TDR and classified as impaired. The Company had obligations to lend $65,000 of additional funds on these TDR as of September 30, 2016. At September 30, 2016, $1,476,000 of PNCI loans were TDR and classified as impaired. The Company had no obligations to lend additional funds on these TDR as of September 30, 2016. . The following tables show certain information regarding Troubled Debt Restructurings (TDRs) that occurred during the periods indicated: TDR Information for the Three Months Ended September 30, 2017 RE Mortgage Home Equity Other Construction ($ in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Number 1 4 — 1 — 8 1 — 15 Pre-mod $ 939 $ 2,886 — $ 252 — $ 1,109 $ 144 — $ 5,330 Post-mod $ 939 $ 2,886 — $ 252 — $ 1,109 $ 144 — $ 5,330 Financial impact due to TDR taken as additional provision $ 169 $ 14 — — — $ 28 — — $ 211 Number that defaulted during the period 1 1 — — — — — — 2 Recorded investment of TDRs that defaulted during the period $ 99 $ 219 — — — — — — $ 318 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — — — — — — — TDR Information for the Nine Months Ended September 30, 2017 RE Mortgage Home Equity Other Construction ($ in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Number 1 7 3 1 1 11 1 — 25 Pre-mod $ 939 $ 3,509 $ 187 $ 252 $ 14 $ 1,854 $ 144 — $ 6,898 Post-mod $ 939 $ 3,482 $ 187 $ 252 $ 14 $ 1,748 $ 144 — $ 6,765 Financial impact due to TDR taken as additional provision $ 169 $ (111 ) $ 27 — $ 11 $ 37 — — $ 133 Number that defaulted during the period 2 1 — — — — — — 3 Recorded investment of TDRs that defaulted during the period $ 223 $ 219 — — — — — — $ 442 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — — — — — — — TDR Information for the Three Months Ended September 30, 2016 RE Mortgage Home Equity Auto Other Construction ($ in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Number 2 2 2 — — 1 3 — — 10 Pre-mod $ 318 $ 170 $ 113 — — $ 8 $ 65 — — $ 674 Post-mod $ 324 $ 170 $ 114 — — $ 8 $ 66 — — $ 682 Financial impact due to TDR taken as additional provision $ 6 — — — — — $ 15 — — $ 21 Number that defaulted during the period 1 — 1 — — — — — — 2 Recorded investment of TDRs that defaulted during the period $ 14 — $ 229 — — — — — — $ 243 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — — — — — — — — The following tables show certain information regarding TDRs that occurred during the periods indicated: TDR Information for the Nine Months Ended September 30, 2016 RE Mortgage Home Equity Auto Other Construction ($ in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Number 3 3 9 3 — 2 4 — — 24 Pre-mod $ 650 $ 248 $ 707 $ 280 — $ 27 $ 77 — — $ 1,989 Post-mod $ 656 $ 249 $ 709 $ 317 — $ 27 $ 77 — — $ 2,035 Financial impact due to TDR taken as additional provision $ 50 — $ 205 $ 46 — $ 2 $ 23 — — $ 326 Number that defaulted during the period 2 — 1 — — — — — — 3 Recorded investment of TDRs that defaulted during the period $ 101 — $ 229 — — — — — — $ 330 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — — — — — — — — Modifications classified as TDRs 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 TDRs, 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	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Foreclosed Assets	Note 6 – Foreclosed Assets A summary of the activity in the balance of foreclosed assets follows (in thousands): Nine months ended September 30, 2017 Nine months ended September 30, 2016 Noncovered Covered Total Noncovered Covered Total Beginning balance, net $ 3,763 $ 223 $ 3,986 $ 5,369 — $ 5,369 Additions/transfers from loans 726 — 726 1,730 $ 223 1,953 Dispositions/sales (1,256 ) (223 ) (1,479 ) (3,157 ) — (3,157 ) Valuation adjustments (162 ) — (162 ) (41 ) — (41 ) Ending balance, net $ 3,701 — $ 3,071 $ 3,901 $ 223 $ 4,124 Ending valuation allowance $ (248 ) — $ (248 ) $ (241 ) — $ (241 ) Ending number of foreclosed assets 11 — 11 14 1 15 Proceeds from sale of foreclosed assets $ 1,571 $ 216 $ 1,787 $ 3,375 — $ 3,375 Gain (loss) on sale of foreclosed assets $ 315 (7 ) $ 308 $ 218 — $ 218 As of September 30, 2017, $1,386,000 of foreclosed residential real estate properties, all of which the Company has obtained physical possession of, are included in foreclosed assets. At September 30, 2017, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are underway is $340,000.

Premises and Equipment

Premises and Equipment	9 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Premises and Equipment	Note 7 - Premises and Equipment Premises and equipment were comprised of: September 30, December 31, 2017 2016 (In thousands) Land & land improvements $ 10,021 $ 9,522 Buildings 43,860 42,345 Furniture and equipment 34,530 31,428 88,411 83,295 Less: Accumulated depreciation (39,892 ) (37,412 ) 48,519 45,883 Construction in progress 6,476 2,523 Total premises and equipment $ 54,995 $ 48,406 Depreciation expense for premises and equipment amounted to $1,520,000 and $1,316,000 for the three months ended September 30, 2017 and 2016, respectively. Depreciation expense for premises and equipment amounted to $4,224,000 and $4,002,000 for the nine months ended September 30, 2017 and 2016, respectively. During the three months ended September 31, 2016, the Company determined to sell a former bank branch property with net book value of $1,934,000, wrote the property down by $716,000 to its estimated market value of $1,218,000, and classified the property as held for sale. The property was subsequently sold during the three months ended September 30, 2016 without gain or further loss.

Cash Value of Life Insurance

Cash Value of Life Insurance	9 Months Ended
	Sep. 30, 2017
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 (in thousands): Nine months ended September 30, 2017 2016 Beginning balance $ 95,912 $ 94,560 Increase in cash value of life insurance 2,043 2,086 Death benefit receivable in excess of cash value 108 238 Death benefit receivable (921 ) (1,603 ) Ending balance $ 97,142 $ 95,281 End of period death benefit $ 165,006 $ 166,623 Number of policies owned 183 187 Insurance companies used 14 14 Current and former employees and directors covered 57 58 As of September 30, 2017, the Bank was the owner and beneficiary of 183 life insurance policies, issued by 14 life insurance companies, covering 57 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

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2017
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: September 30, December 31, (dollar in thousands) 2017 Additions Reductions 2016 Goodwill $ 64,311 — — $ 64,311 The following table summarizes the Company’s core deposit intangibles as of the dates indicated: September 30, Reductions/ Fully December 31, (dollar in thousands) 2017 Additions Amortization Depreciated 2016 Core deposit intangibles $ 9,558 — — $ (562 ) $ 10,120 Accumulated amortization (4,045 ) — $ (1,050 ) $ 562 (3,557 ) Core deposit intangibles, net $ 5,513 — $ (1,050 ) — $ 6,563 The Company recorded additions to its CDI of $2,046,000 in conjunction with the acquisition of three branch offices from Bank of America on March 18, 2016, $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 remaining estimated core deposit intangible amortization (dollars in thousands): Estimated Core Deposit Periods Ended Intangible Amortization 2017 $ 339 2018 1,324 2019 1,228 2020 1,228 2021 969 Thereafter 425

Mortgage Servicing Rights

Mortgage Servicing Rights	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Mortgage Servicing Rights	Note 10 - Mortgage Servicing Rights The following tables summarize the activity in, and the main assumptions used to determine the fair value of mortgage servicing rights (“MSRs”) for the periods indicated (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Mortgage servicing rights: Balance at beginning of period $ 6,596 $ 6,720 $ 6,595 $ 7,618 Additions 147 287 619 788 Change in fair value (324 ) (799 ) (795 ) (2,198 ) Balance at end of period $ 6,419 $ 6,208 $ 6,419 $ 6,208 Servicing, late and ancillary fees received $ 513 $ 480 $ 1,560 $ 1,513 Balance of loans serviced at: Beginning of period $ 822,549 $ 814,702 $ 816,623 $ 817,917 End of period $ 812,005 $ 811,128 $ 812,005 $ 811,128 Period end: Weighted-average prepayment speed (CPR) 9.2 % 12.8 % Discount rate 14.0 % 12.0 % The changes in fair value of MSRs that occurred during the three and nine months ended September 30, 2017 and 2016 were mainly due to changes in principal balances, changes in mortgage prepayment speeds, and changes in investor required rate of return, or discount rate, of the MSRs

Indemnification Asset

Indemnification Asset	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Indemnification Asset	Note 11 - Indemnification Asset A summary of the activity in the balance of indemnification asset (liability) follows (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Beginning (payable) receivable balance — $ (662 ) $ (744 ) $ (521 ) Effect of actual covered losses and change in estimated future covered losses — 17 (224 ) (245 ) Reimbursable expenses (revenue), net — — 256 (4 ) Payments made (received) — 107 — 232 Gain on termination of loss share agreement — — 712 — Ending (payable) receivable balance — $ (538 ) — $ (538 ) Amount of indemnification asset recorded in other assets — $ 95 Amount of indemnification liability recorded in other liabilities — (633 ) Ending balance — $ (538 ) During May 2015, the indemnification portion of the Company’s agreement with the FDIC related to the Company’s acquisition of certain nonresidential real estate loans of Granite in May 2010 expired. The indemnification portion of the Company’s agreement with the FDIC related to the Company’s acquisition of certain residential real estate loans of Granite in May 2010 was set to expire in May 2018. The agreement specified that recoveries of losses that are claimed by the Company and indemnified by the FDIC under the agreement that are recovered by the Company through May 2020 are to be shared with the FDIC in the same proportion as they were indemnified by the FDIC. In addition, the agreement specified that at the end of the agreement in May 2020, to the extent that total claimed losses plus servicing expenses, net of recoveries, claimed under the agreement over the entire ten year period of the agreement did not meet a certain threshold, the Company would have been required to pay to the FDIC a “true up” amount equal to fifty percent of the difference of the threshold and actual claimed losses plus servicing expenses, net of recoveries. On May 9, 2017, the Company and the FDIC terminated their loss sharing agreements. As part of the termination agreement, the Company paid the FDIC $184,000, and recorded a $712,000 gain representing the difference between the Company’s payment to the FDIC and the recorded payable balance on May 9, 2017.

Other Assets

Other Assets	9 Months Ended
	Sep. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	Note 12 – Other Assets Other assets were comprised of (in thousands): September 30, December 31, 2017 2016 Deferred tax asset, net $ 33,091 $ 36,199 Prepaid expense 3,912 3,045 Software 1,563 2,039 Advanced compensation — 249 Capital Trusts 1,706 1,702 Investment in Low Housing Tax Credit Funds 17,453 18,465 Life insurance proceeds receivable 2,242 2,120 Tax refund receivable — 6,460 Premises held for sale — 2,896 Due from broker 25,757 — Miscellaneous other assets 1,212 1,568 Total other assets $ 86,936 $ 74,743

Deposits

Deposits	9 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
Deposits	Note 13 - Deposits A summary of the balances of deposits follows (in thousands): September 30 December 31, 2017 2016 Noninterest-bearing demand $ 1,283,949 $ 1,275,745 Interest-bearing demand 965,480 887,625 Savings 1,367,597 1,397,036 Time certificates, over $250,000 74,944 75,184 Other time certificates 235,486 259,970 Total deposits $ 3,927,456 $ 3,895,560 Certificate of deposit balances of $50,000,000 from the State of California were included in time certificates, $250,000 and over, at each of September 30, 2017 and December 31, 2016. 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. Overdrawn deposit balances of $1,219,000 and $1,191,000 were classified as consumer loans at September 30, 2017 and December 31, 2016, respectively.

Reserve for Unfunded Commitment

Reserve for Unfunded Commitments	9 Months Ended
	Sep. 30, 2017
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): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Balance at beginning of period $ 2,599 $ 2,883 $ 2,719 $ 2,475 Provision for losses – unfunded commitments 390 25 270 433 Balance at end of period $ 2,989 $ 2,908 $ 2,989 $ 2,908

Other Liabilities

Other Liabilities	9 Months Ended
	Sep. 30, 2017
Other Liabilities Disclosure [Abstract]
Other Liabilities	Note 15 – Other Liabilities Other liabilities were comprised of (in thousands): September 30, December 31, 2017 2016 Deferred compensation $ 6,431 $ 6,525 Pension liability 27,238 26,645 Joint beneficiary agreements 3,192 3,007 Low income housing tax credit fund commitments 11,439 15,176 Accrued salaries and benefits expense 6,176 5,704 Loan escrow and servicing payable 2,264 2,146 Deferred Revenue 1,759 726 Litigation contingency 1,450 1,450 Miscellaneous other liabilities 2,901 5,985 Total other liabilities $ 62,850 $ 67,364

Other Borrowings

Other Borrowings	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Other Borrowings	Note 16 - Other Borrowings A summary of the balances of other borrowings follows: September 30, December 31, 2017 2016 (in thousands) FHLB collateralized borrowing, fixed rate, as of September 30, 2017 of 1.11%, payable on October 2, 2017 $ 85,737 — Other collateralized borrowings, fixed rate, as of September 30, 2017 of 0.05%, payable on October 2, 2017 12,993 $ 17,493 Total other borrowings $ 98,730 $ 17,493 The Company did not enter into any repurchase agreements during the nine months ended September 30, 2017 or the year ended December 31, 2016. The Company maintains a collateralized line of credit with the Federal Home Loan Bank of San Francisco. Based on the FHLB stock requirements at September 30, 2017, this line provided for maximum borrowings of $1,303,462,000 of which $85,737,000 was outstanding as of September 30, 2017, leaving $1,217,725,000 available. As of September 30, 2017, the Company has designated investment securities with fair value of $70,534,000 and loans totaling $1,919,515,000 as potential collateral under this collateralized line of credit with the FHLB. The Company had $12,993,000 and $17,493,000 of other collateralized borrowings at September 30, 2017 and December 31, 2016, respectively. Other collateralized borrowings are generally overnight maturity borrowings from non-financial The Company maintains a collateralized line of credit with the San Francisco Federal Reserve Bank. As of September 30, 2017, this line provided for maximum borrowings of $130,985,000 of which none was outstanding, leaving $130,985,000 available. As of September 30, 2017, the Company has designated investment securities with fair value of $18,000 and loans totaling $232,290,000 as potential collateral under this collateralized line of credit with the San Francisco Federal Reserve Bank. The Company had available unused correspondent banking lines of credit from commercial banks totaling $20,000,000 for federal funds transactions at September 30, 2017.

Junior Subordinated Debt

Junior Subordinated Debt	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Junior Subordinated Debt	Note 17 – Junior Subordinated Debt At September 30, 2017, the Company had five wholly-owned subsidiary business trusts that had issued $62.9 million of trust preferred securities (the “Capital Trusts”). Trust preferred securities accrue and pay distributions periodically at specified annual rates as provided in the indentures. The trusts used the net proceeds from the offering to purchase a like amount of subordinated debentures (the “Debentures”) of the Company. The Debentures are the sole assets of the trusts. The Company’s obligations under the subordinated debentures and related documents, taken together, constitute a full and unconditional guarantee by the Company of the obligations of the trusts. The trust preferred securities are mandatorily redeemable upon the maturity of the Debentures, or upon earlier redemption as provided in the indentures. The Company has the right to redeem the Debentures in whole (but not in part) on or after specific dates, at a redemption price specified in the indentures plus any accrued but unpaid interest to the redemption date. The Company also has a right to defer consecutive payments of interest on the debentures for up to five years. The Company organized two of the Capital Trusts. The Company acquired its three other Capital Trusts and assumed their related Debentures as a result of its acquisition of North Valley Bancorp. At the acquisition date of October 3, 2014, the Debentures associated with North Valley Bancorp’s three Capital Trusts 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 interests in each of the acquired Capital Trusts and these discounts will be proportionally amortized over the remaining time to maturity for each related debenture. The recorded book values of the 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): Coupon Rate As of September 30, 2017 December 31, 2016 Subordinated Maturity Face (Variable) Current Recorded Recorded Debt Series Date Value 3 mo. LIBOR + Coupon Rate Book Value Book Value TriCo Cap Trust I 10/7/2033 $ 20,619 3.05 % 4.35 % $ 20,619 $ 20,619 TriCo Cap Trust II 7/23/2034 20,619 2.55 % 3.86 % 20,619 20,619 North Valley Trust II 4/24/2033 6,186 3.25 % 4.56 % 5,125 5,095 North Valley Trust III 4/24/2034 5,155 2.80 % 4.11 % 4,032 4,005 North Valley Trust IV 3/15/2036 10,310 1.33 % 2.65 % 6,415 6,329 $ 62,889 $ 56,810 $ 56,667 During the nine months ended September 30, 2017, the balance of Junior Subordinated Debt increased $143,000 to $56,810,000 due to purchase fair value discount amortization.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 18 - Commitments and Contingencies Restricted Cash Balances Lease Commitments non-cancelable At December 31, 2016, future minimum commitments under non-cancelable Operating Leases (in thousands) 2017 $ 3,320 2018 2,523 2019 1,924 2020 1,325 2021 963 Thereafter 1,696 Future minimum lease payments $ 11,751 Rent expense under operating leases was $1,038,000 and $1,034,000 during the three months ended September 30, 2017 and 2016, respectively. Rent expense was offset by rent income of $10,000 and $58,000 during the three months ended September 30, 2017 and 2016, respectively. Rent expense under operating leases was $3,134,000 and $3,024,000 during the nine months ended September 30, 2017 and 2016, respectively. Rent expense was offset by rent income of $34,000 and $177,000 during the nine months ended September 30, 2017 and 2016, respectively. Financial Instruments with Off-Balance-Sheet off-balance 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 (in thousands) September 30, December 31, 2017 2016 Financial instruments whose amounts represent risk: Commitments to extend credit: Commercial loans $ 253,673 $ 220,836 Consumer loans 422,521 406,855 Real estate mortgage loans 63,290 42,184 Real estate construction loans 170,416 97,399 Standby letters of credit 12,700 12,763 Deposit account overdraft privilege 96,650 98,583 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 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 in-store non-exempt non-binding In addition to this, on January 20, 2015, a then-current Personal Banker at one of the Bank’s in-store non-exempt non-binding As part of the mediations, which took place concurrently, the Bank agreed in principal to settle the two matters in a consolidated settlement proceeding. In connection with the settlement and in consideration of a full release of all claims raised in both the actions, the Bank has agreed to pay up to $1.9 million though the actual cost of the settlement will depend on the number of claims submitted by the members of the purported classes. As a result, the Bank estimates the actual cost of the settlement may be approximately $1,450,000, and recorded such estimate. The settlement agreement was preliminarily approved and has been executed, although final settlement is subject to customary conditions, including court approval following notice to the members of the purported classes. It should be noted there are no assurances the court will approve the final settlement. Neither the Company nor its subsidiaries are a party to any other pending legal proceedings that are material, nor is their property the subject of any other material pending legal proceeding at this time. All other legal proceedings are routine and arise out of the ordinary course of the Bank’s business. None of those proceedings are currently expected to have a material adverse impact upon the Company’s and the Bank’s business, their consolidated financial position nor their operations in any material amount not already accrued, after taking into consideration any applicable insurance. Other Commitments and Contingencies The Bank owns 13,396 shares of Class B common stock of Visa Inc. which are convertible into Class A common stock at a conversion ratio of 1.648265 per Class B share. As of September 30, 2017, the value of the Class A shares was $105.24 per share. Utilizing the conversion ratio, the value of unredeemed Class A equivalent shares owned by the Bank was $2,324,000 as of September 30, 2017, and has not been reflected in the accompanying financial statements. The shares of Visa Class B common stock are restricted and may not be transferred. Visa Member Banks are required to fund an escrow account to cover settlements, resolution of pending litigation and related claims. If the funds in the escrow account are insufficient to settle all the covered litigation, Visa may sell additional Class A shares, use the proceeds to settle litigation, and further reduce the conversion ratio. If funds remain in the escrow account after all litigation is settled, the Class B conversion ratio will be increased to reflect that surplus. 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	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Shareholders' Equity	Note 19 – Shareholders’ Equity Dividends Paid The Bank paid to the Company cash dividends in the aggregate amounts of $5,185,000 and $4,097,000 during the three months ended September 30, 2017 and 2016, respectively, and $14,394,000 and $11,434,000 during the nine months ended September 30, 2017 and 2016, 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 the 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, 2016, the Bank could have paid dividends of $82,615,000 to the Company without the approval of the Commissioner of the Department of Business Oversight. 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 September 30, 2017, the Company had repurchased 166,600 shares under this plan. During the nine months ended September 30, 2017, and the year ended December 31, 2016, the Company repurchased no shares under this repurchase plan. Stock Repurchased Under Equity Compensation Plans During the three months ended September, 2017 and 2016, employees tendered 21,738 and 4,129 shares, respectively, of the Company’s common stock with market value of $762,000, and $108,000, respectively, in lieu of cash to exercise options to purchase shares of the Company’s stock and to pay income taxes related to equity compensation plan instruments as permitted by the Company’s shareholder-approved equity compensation plans. During the nine months ended September 30, 2017 and 2016 employees tendered 107,390 and 101,125 shares, respectively, of the Company’s common stock with market value of $3,854,000 and $2,774,000, respectively, in lieu of cash to exercise options to purchase shares of the Company’s stock and to satisfy tax withholding requirements related to such exercises and the release of RSUs 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 equity compensation plan instrument is exercised or released. Stock repurchased under equity incentive plans are not included in the total of stock repurchased under the stock repurchase plan announced on August 21, 2007.

Stock Options and Other Equity-

Stock Options and Other Equity-Based Incentive Instruments	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017, 411,900 options for the purchase of common shares, and 123,479 restricted stock units were outstanding, and 527,651 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 September 30, 2017, 46,500 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 during the nine months ended September 30, 2017 is summarized in the following table: Number Option Price per Share Weighted Weighted Outstanding at December 31, 2016 592,250 $ 12.63 to $ 23.21 $ 17.12 Options granted — — to — — — Options exercised (133,850 ) $ 14.54 to $ 22.54 $ 18.07 Options forfeited — — to — — Outstanding at September 30, 2017 458,400 $ 12.63 to $ 23.21 $ 16.85 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 September 30, 2017: Currently Currently Not Total Number of options 431,100 27,300 458,400 Weighted average exercise price $ 16.61 $ 20.54 $ 16.85 Intrinsic value (in thousands) $ 10,406 $ 552 $ 10,958 Weighted average remaining contractual term (yrs.) 4.0 6.1 4.1 The 27,300 options that are currently not exercisable as of September 30, 2017 are expected to vest, on a weighted-average basis, over the next 1.1 years, and the Company is expected to recognize $157,000 of pre-tax 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 Weighted Outstanding at December 31, 2016 68,450 47,426 RSUs granted 29,669 $ 35.36 17,939 $ 32.95 Additional market plus service condition RSUs vested 6,269 RSUs added through dividend credits 939 — RSUs released (28,397 ) (18,805 ) RSUs forfeited/expired (11 ) — Outstanding at September 30, 2017 70,650 52,829 The 70,650 of service condition vesting RSUs outstanding as of September 30, 2017 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 70,650 of service condition vesting RSUs outstanding as of September 30, 2017 are expected to vest, and be released, on a weighted-average basis, over the next 1.5 years. The Company expects to recognize $1,686,000 of pre-tax The 52,829 of market plus service condition vesting RSUs outstanding as of September 30, 2017 are expected to vest, and be released, on a weighted-average basis, over the next 1.6 years. The Company expects to recognize $839,000 of pre-tax

Noninterest Income and Expense

Noninterest Income and Expense	9 Months Ended
	Sep. 30, 2017
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): Three months ended Nine months ended 2017 2016 2017 2016 Service charges on deposit accounts $ 4,160 $ 3,641 $ 12,102 $ 10,549 ATM and interchange fees 4,209 3,851 12,472 11,136 Other service fees 917 792 2,521 2,369 Mortgage banking service fees 514 537 1,561 1,570 Change in value of mortgage servicing rights (325 ) (799 ) (795 ) (2,198 ) Total service charges and fees 9,475 8,022 27,861 23,426 Gain on sale of loans 606 953 2,293 2,645 Commissions on sale of non-deposit 672 747 1,984 1,890 Increase in cash value of life insurance 732 709 2,043 2,086 Gain on sale of investment securities 961 — 961 — Change in indemnification asset — (10 ) 490 (274 ) Gain on sale of foreclosed assets 37 69 308 218 Sale of customer checks 89 110 287 299 Lease brokerage income 234 172 601 602 Loss on disposal of fixed assets (33 ) (13 ) (61 ) (52 ) Life Insurance death benefit in excess of cash value — — 108 238 Other 157 307 668 1,023 Total other noninterest income 3,455 3,044 9,682 8,675 Total noninterest income $ 12,930 $ 11,066 $ 37,543 $ 32,101 Mortgage loan servicing fees, net of change in fair value of mortgage loan servicing rights $ 189 $ (262 ) $ 766 $ (628 ) Mortgage banking revenue $ 795 $ 691 $ 3,059 $ 2,017 The components of noninterest expense were as follows (in thousands): Three months ended Nine months ended 2017 2016 2017 2016 Base salaries, net of deferred loan origination costs $ 13,600 $ 13,419 $ 40,647 $ 39,095 Incentive compensation 2,609 2,798 6,980 7,008 Benefits and other compensation costs 4,724 4,643 14,693 14,067 Total salaries and benefits expense 20,933 20,860 62,320 60,170 Occupancy 2,799 2,667 8,196 7,504 Equipment 1,816 1,607 5,344 4,837 Data processing and software 2,495 2,068 7,332 6,266 ATM & POS network charges 1,425 1,915 3,353 3,923 Telecommunications 716 702 2,027 2,085 Postage 325 381 1,058 1,186 Courier service 235 280 752 816 Advertising 1,039 1,049 3,173 3,021 Assessments 427 654 1,252 1,864 Operational losses 301 497 1,166 1,006 Professional fees 901 1,018 2,357 3,183 Foreclosed assets expense 41 37 117 197 Provision for foreclosed asset losses 134 8 162 40 Change in reserve for unfunded commitments 390 25 270 433 Intangible amortization 339 359 1,050 1,017 Merger expense — — — 784 Litigation contingent liability — — — 1,450 Other 2,906 3,289 9,019 9,652 Total other noninterest expense 16,289 16,556 46,628 49,264 Total noninterest expense $ 37,222 $ 37,416 $ 108,948 $ 109,434 Merger expense: Base salaries (outside temporary help) — — — $ 187 Equipment — — — 35 Professional fees — — — 342 Advertising and marketing — — — 114 Other — — — 106 Total merger expense — — — $ 784 Average full time equivalent staff 993 1,022 1,005 996 Noninterest expense to revenue (FTE) 64.6 % 69.4 % 64.5 % 69.0 %

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 22 - Income Taxes The provisions for income taxes applicable to income before taxes 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 for the periods indicated as follows: Three months ended Nine months ended 2017 2016 2017 2016 Federal statutory income tax rate 35.0 % 35.0 % 35.0 % 35.0 % State income taxes, net of federal tax benefit 6.9 6.9 6.8 6.7 Tax-exempt (1.9 ) (1.7 ) (1.8 ) (1.9 ) Increase in cash value of insurance policies (1.3 ) (1.2 ) (1.3 ) (1.6 ) Low income housing tax credits (0.5 ) (0.3 ) (0.4 ) (0.3 ) Equity compensation (0.8 ) — (1.4 ) — Other 0.1 — 0.2 0.1 Effective Tax Rate 37.5 % 38.7 % 37.1 % 38.0 %

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Note 23 - Earnings Per Share Basic earnings per share represent income available to common shareholders divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per share reflect 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: Three months ended Nine months ended (in thousands) 2017 2016 2017 2016 Net income $ 11,897 $ 12,199 $ 37,565 $ 32,278 Average number of common shares outstanding 22,932 22,825 22,901 22,804 Effect of dilutive stock options and restricted stock units 312 274 338 273 Average number of common shares outstanding used to calculate diluted earnings per share 23,244 23,099 23,239 23,077 Options excluded from diluted earnings per share because the effect of these options was antidilutive — 12 — 18

Comprehensive Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2017
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 The components of accumulated other comprehensive income, included in shareholders’ equity, are as follows: September 30, December 31, (in thousands) Net unrealized loss on available for sale securities $ (3,459 ) $ (8,870 ) Tax effect 1,455 3,729 Unrealized holding loss on available for sale securities, net of tax (2,004 ) (5,141 ) Unfunded status of the supplemental retirement plans (4,431 ) (4,714 ) Tax effect 1,863 1,982 Unfunded status of the supplemental retirement plans, net of tax (2,568 ) (2,732 ) Joint beneficiary agreement liability (40 ) (40 ) Tax effect — — Joint beneficiary agreement liability, net of tax (40 ) (40 ) Accumulated other comprehensive loss $ (4,612 ) $ (7,913 ) The components of other comprehensive income and related tax effects are as follows: Three Months Ended Nine Months Ended (in thousands) 2017 2016 2017 2016 Unrealized holding gains (losses) on available for sale securities before reclassifications $ 674 $ (2,058 ) $ 6,372 $ 11,240 Amounts reclassified out of accumulated other comprehensive income (961 ) — (961 ) — Unrealized holding (losses) gains on available for sale securities after reclassifications (287 ) (2,058 ) 5,411 11,240 Tax effect 121 865 (2,274 ) (4,726 ) Unrealized holding (losses) gains on available for sale securities, net of tax (166 ) (1,193 ) 3,137 $ 6,514 Change in unfunded status of the supplemental retirement plans before reclassifications — — — — Amounts reclassified out of accumulated other comprehensive income: Amortization of prior service cost (1 ) (10 ) (5 ) (30 ) Amortization of actuarial losses 96 138 288 413 Total amounts reclassified out of accumulated other comprehensive income 95 128 283 383 Change in unfunded status of the supplemental retirement plans after reclassifications 95 128 283 383 Tax effect (40 ) (54 ) (119 ) (161 ) Change in unfunded status of the supplemental retirement plans, net of tax 55 74 164 222 Change in joint beneficiary agreement liability before reclassifications — (1 ) — (5 ) Amounts reclassified out of accumulated other comprehensive income — — — — Change in joint beneficiary agreement liability after reclassifications — (1 ) — (5 ) Tax effect — — — — Change in joint beneficiary agreement liability, net of tax — (1 ) — (5 ) Total other comprehensive (loss) income $ (111 ) $ (1,120 ) $ 3,301 $ 6,731

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2017
Retirement Benefits [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 following table sets forth the benefit expense attributable to the 401(k) Plan matching contributions, and the contributions made by the Company to the 401(k) Plan during the periods indicated: Three months ended September 30, Nine months ended September 30, (in thousands) 2017 2016 2017 2016 401(k) Plan benefits expense $ 164 $ 187 $ 603 $ 515 401(k) Plan contributions made by the Company $ 224 $ 187 $ 595 $ 648 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. Company shares owned by the ESOP are paid dividends and included in the calculation of earnings per share exactly as other common shares outstanding. The following table sets forth the benefit expense attributable to the ESOP, and the contributions made by the Company to the ESOP during the periods indicated: Three months ended September 30, Nine months ended September 30, (in thousands) 2017 2016 2017 2016 ESOP benefits expense $ 537 $ 463 $ 1,610 $ 1,368 ESOP contributions made by the Company $ 537 — $ 2,073 $ 905 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 $6,431,000 and $6,525,000 at September 30, 2017 and December 31, 2016, respectively. The following table sets forth the earnings credits on deferred balances included in noninterest expense during the periods indicated: Three months ended September 30, Nine months ended September 30, (in thousands) 2017 2016 2017 2016 Deferred compensation earnings credits included in noninterest expense $ 111 $ 111 $ 365 $ 366 Supplemental Retirement Plans The Company has supplemental retirement plans for current and former directors and key executives. These plans are non-qualified Three months ended Nine months ended (in thousands) 2017 2016 2017 2016 Net pension cost included the following components: Service cost-benefits earned during the period $ 235 $ 260 $ 706 $ 781 Interest cost on projected benefit obligation 248 256 743 769 Amortization of net obligation at transition — 1 1 1 Amortization of prior service cost (3 ) (10 ) (8 ) (30 ) Recognized net actuarial loss 98 137 292 412 Net periodic pension cost $ 578 $ 644 $ 1,734 $ 1,933 Company contributions to pension plans $ 267 $ 260 $ 856 $ 834 Pension plan payouts to participants $ 267 $ 260 $ 856 $ 834 For the year ending December 31, 2017, the Company expects to contribute and pay out as benefits $1,117,000 to participants under the plans.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2017
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 periods indicated (in thousands): Balance December 31, 2015 $ 4,201 Advances/new loans 730 Removed/payments (2,499 ) Balance December 31, 2016 2,432 Advances/new loans 160 Removed/payments (666 ) Balance September 30, 2017 $ 1,926

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2017
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 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 over-the-counter 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): Fair value at September 30, 2017 Total Level 1 Level 2 Level 3 Securities available for sale: Obligations of U.S. government corporations and agencies $ 554,062 — $ 554,062 — Obligations of states and political subdivisions 121,217 — 121,217 — Marketable equity services 2,957 $ 2,957 — — Mortgage servicing rights 6,419 — — $ 6,419 Total assets measured at fair value $ 684,655 $ 2,957 $ 675,279 $ 6,419 Fair value at December 31, 2016 Total Level 1 Level 2 Level 3 Securities available-for-sale: Obligations of U.S. government corporations and agencies $ 429,678 — $ 429,678 — Obligations of states and political subdivisions 117,617 — 117,617 — Marketable equity securities 2,938 $ 2,938 — — Mortgage servicing rights 6,595 — — $ 6,595 Total assets measured at fair value $ 556,828 $ 2,938 $ 547,295 $ 6,595 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 the six months ended September 30, 2017 or the year ended December 31, 2016. 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 time periods indicated. Had there been any transfer into or out of Level 3 during the time periods indicated, 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): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Mortgage servicing rights: Balance at beginning of period $ 6,596 $ 6,720 $ 6,595 $ 7,618 Additions 147 287 619 788 Change in fair value (324 ) (799 ) (795 ) (2,198 ) Balance at end of period $ 6,419 $ 6,208 $ 6,419 $ 6,208 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 September 30, 2017: Fair Value Valuation Unobservable Range, Mortgage Servicing Rights $ 6,419 Discounted cash flow Constant prepayment rate 6.5%-21.4%, 9.2% Discount rate 14.0%-16.0%, 14.0% The following table presents quantitative information about recurring Level 3 fair value measurements at December 31, 2016: Fair Value Valuation Unobservable Range, Mortgage Servicing Rights $ 6,595 Discounted cash flow Constant prepayment rate 6.9%-16.6%, 8.8% Discount rate 14.0%-16.0%, 14.0% The tables below present the recorded investment in assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated (in thousands): Nine months ended September 30, 2017 Total Level 1 Level 2 Level 3 Total Gains (Losses) Fair value: Impaired Originated & PNCI loans $ 1,026 — — $ 1,026 $ (892 ) Foreclosed assets 2,062 — — 2,062 (157 ) Total assets measured at fair value $ 3,088 — — $ 3,088 $ (1,049 ) Year ended December 31, 2016 Total Level 1 Level 2 Level 3 Total Gains Fair value: Impaired Originated & PNCI loans $ 1,107 — — $ 1,107 $ (409 ) Foreclosed assets 2,253 2,253 (86 ) Total assets measured at fair value $ 3,360 — — $ 3,360 $ (495 ) Nine months ended September 30, 2016 Total Level 1 Level 2 Level 3 Total Fair value: Impaired Originated & PNCI loans $ 5,941 — — $ 5,941 $ (570 ) Foreclosed assets 1,801 — — 1,801 14 Total assets measured at fair value $ 7,742 — — $ 7,742 $ (556 ) 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 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 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 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 September 30, 2017: Fair Value Valuation Unobservable Inputs Range, Weighted Impaired Originated & PNCI loans $ 1,026 Sales comparison Adjustment for differences between comparable sales Capitalization rate (74)%-21%, (32%) Foreclosed assets (Land & construction) $ 960 Sales comparison Adjustment for differences between comparable sales (53)%-283%, Foreclosed assets (residential $ 822 Sales comparison Adjustment for differences between comparable sales (47%)-39%, Foreclosed assets $ 280 Sales comparison Adjustment for differences between comparable sales (46%)-63%, 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, 2016: Fair Value Valuation Unobservable Inputs Range, Impaired Originated & PNCI loans $ 1,107 Sales comparison Adjustment for differences between comparable sales Capitalization rate Not meaningful N/A Foreclosed assets $ 15 Sales comparison Adjustment for differences between comparable sales Not meaningful Foreclosed assets $ 1,564 Sales comparison Adjustment for differences between comparable sales Not meaningful Foreclosed assets $ 674 Sales comparison Adjustment for differences between comparable sales Not meaningful 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 over-the-counter Restricted Equity Securities Originated and PNCI loans PCI Loans 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): September 30, 2017 December 31, 2016 Carrying Fair Carrying Fair Financial assets: Level 1 inputs: Cash and due from banks $ 86,815 $ 86,815 $ 92,197 $ 92,197 Cash at Federal Reserve and other banks 101,219 101,219 213,415 213,415 Level 2 inputs: Securities held to maturity 536,567 542,123 602,536 603,203 Restricted equity securities 16,956 N/A 16,956 N/A Loans held for sale 2,733 2,733 2,998 2,998 Level 3 inputs: Loans, net 2,902,866 2,928,059 2,727,090 2,763,473 Financial liabilities: Level 2 inputs: Deposits 3,927,456 3,925,527 3,895,560 3,893,941 Other borrowings 98,730 98,730 17,493 17,493 Level 3 inputs: Junior subordinated debt $ 56,810 $ 55,259 $ 56,667 $ 49,033 Contract Fair Contract Fair Off-balance Level 3 inputs: Commitments $ 909,900 $ 9,099 $ 767,274 $ 7,673 Standby letters of credit $ 12,700 $ 128 $ 12,763 $ 128 Overdraft privilege commitments $ 96,650 $ 967 $ 98,583 $ 986

TriCo Bancshares Condensed Fina

TriCo Bancshares Condensed Financial Statements (Parent Only)	9 Months Ended
	Sep. 30, 2017
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 September 30, December 31, (In thousands) Assets Cash and Cash equivalents $ 3,278 $ 2,802 Investment in Tri Counties Bank 558,986 529,907 Other assets 1,729 1,711 Total assets $ 563,993 $ 534,420 Liabilities and shareholders’ equity Other liabilities $ 450 $ 406 Junior subordinated debt 56,810 56,667 Total liabilities 57,260 57,073 Shareholders’ equity: Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 22,941,464 and 22,867,802 shares, respectively 255,231 252,820 Retained earnings 256,114 232,440 Accumulated other comprehensive loss, net (4,612 ) (7,913 ) Total shareholders’ equity 506,733 477,347 Total liabilities and shareholders’ equity $ 563,993 $ 534,420 Statements of Income Three months ended Nine months ended (In thousands) 2017 2016 2017 2016 Interest expense $ 652 $ 562 $ 1,870 $ 1,643 Administration expense 209 158 586 548 Loss before equity in net income of Tri Counties Bank (861 ) (720 ) (2,456 ) (2,191 ) Equity in net income of Tri Counties Bank: Distributed 5,185 4,096 14,394 11,434 (Over) under distributed 7,211 8,522 24,594 22,116 Income tax benefit 362 301 1,033 919 Net income $ 11,897 $ 12,199 $ 37,565 $ 32,278 Statements of Comprehensive Income Three months ended Nine months ended (In thousands) 2017 2016 2017 2016 Net income $ 11,897 $ 12,199 $ 37,565 $ 32,278 Other comprehensive income (loss), net of tax: Unrealized holding (losses) gains on available for sale securities arising during the period (166 ) (1,193 ) 3,137 6,514 Change in minimum pension liability 55 74 164 222 Change in joint beneficiary liability — (1 ) — (5 ) Other comprehensive (loss) income (111 ) (1,120 ) 3,301 6,731 Comprehensive income $ 11,786 $ 11,079 $ 40,866 $ 39,009 Statements of Cash Flows Nine months ended (In thousands) 2017 2016 Operating activities: Net income $ 37,565 $ 32,278 Adjustments to reconcile net income to net cash provided by operating activities: Over (under) distributed equity in earnings of Tri Counties Bank (24,594 ) (22,116 ) Equity compensation vesting expense 1,184 1,078 Equity compensation net (excess tax benefit) tax expense — 182 Net change in other assets and liabilities (1,015 ) (906 ) Net cash provided by operating activities 13,140 10,516 Investing activities: None Financing activities: Issuance of common stock through option exercise 193 518 Equity compensation net (excess tax benefit) tax expense — (182 ) Repurchase of common stock (1,629 ) (384 ) Cash dividends paid — common (11,228 ) (10,265 ) Net cash used for financing activities (12,664 ) (10,313 ) Increase in cash and cash equivalents 476 203 Cash and cash equivalents at beginning of year 2,802 2,565 Cash and cash equivalents at end of year $ 3,278 $ 2,768

Regulatory Matters

Regulatory Matters	9 Months Ended
	Sep. 30, 2017
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 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. The following tables present actual and required capital ratios as of September 30, 2017 and December 31, 2016 for the Company and the Bank under Basel III Capital Rules. The minimum capital amounts presented include the minimum required capital levels as of September 30, 2017 (1.25%) and December 31, 2016 (0.625%) based on the then phased-in phased-in. Minimum Capital Minimum Capital Required to be Required – Basel III Required – Basel III Considered Well Actual Phase-in Fully Phased In Capitalized Amount Ratio Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of September 30, 2017: Total Capital (to Risk Weighted Assets): Consolidated $ 525,569 14.42 % $ 337,117 9.250 % $ 382,673 10.50 % N/A N/A Tri Counties Bank $ 522,718 14.35 % $ 336,957 9.250 % $ 382,492 10.50 % $ 364,278 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 493,833 13.55 % $ 264,227 7.250 % $ 309,783 8.50 % N/A N/A Tri Counties Bank $ 490,982 13.48 % $ 264,102 7.250 % $ 309,636 8.50 % $ 291,422 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 439,498 12.06 % $ 209,559 5.750 % $ 255,116 7.00 % N/A N/A Tri Counties Bank $ 490,982 13.48 % $ 209,460 5.750 % $ 254,995 7.00 % $ 236,781 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 493,833 10.98 % $ 179,925 4.000 % $ 179,925 4.00 % N/A N/A Tri Counties Bank $ 490,982 10.92 % $ 179,920 4.000 % $ 179,920 4.00 % $ 224,900 5.00 % Minimum Capital Minimum Capital Required to be Required – Basel III Required – Basel III Considered Well Actual Phase-in Fully Phased In Capitalized Amount Ratio Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of December 31, 2016: Total Capital (to Risk Weighted Assets): Consolidated $ 503,283 14.77 % $ 293,854 8.625 % $ 357,735 10.50 % N/A N/A Tri Counties Bank $ 500,876 14.71 % $ 293,706 8.625 % $ 357,556 10.50 % $ 340,529 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 468,061 13.74 % $ 225,714 6.625 % $ 289,595 8.50 % N/A N/A Tri Counties Bank $ 465,654 13.67 % $ 225,601 6.625 % $ 289,450 8.50 % $ 274,725 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 414,632 12.17 % $ 174,609 5.125 % $ 238,490 7.00 % N/A N/A Tri Counties Bank $ 465,654 13.66 % $ 174,521 5.125 % $ 238,370 7.00 % $ 221,344 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 468,061 10.62 % $ 176,346 4.000 % $ 176,346 4.00 % N/A N/A Tri Counties Bank $ 465,654 10.56 % $ 176,341 4.000 % $ 176,341 4.00 % $ 220,426 5.00 % As of September 30, 2017, capital levels at the Company and the Bank exceed all capital adequacy requirements under the Basel III Capital Rules on a fully phased-in Beginning January 1, 2016, the Basel III Capital Rules implemented a requirement for all banking organizations to maintain a capital conservation buffer above the minimum risk-based capital requirements in order to avoid certain limitations on capital distributions, stock repurchases and discretionary bonus payments to executive officers. The capital conservation buffer is exclusively composed of common equity tier 1 capital, and it applies to each of the risk-based capital ratios but not the leverage ratio. At September 30, 2017, the Company and the Bank are in compliance with the capital conservation buffer requirement. The three risk-based capital ratios will increase by 0.625% each year through 2019, at which point, the common equity tier 1 risk-based, tier 1 risk-based and total risk-based capital ratio minimums will be 7.0%, 8.5% and 10.5%, respectively.

Summary of Quarterly Results of

Summary of Quarterly Results of Operations (unaudited)	9 Months Ended
	Sep. 30, 2017
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 periods indicated, 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. 2017 Quarters Ended September 30, June 30, March 31, (dollars in thousands, except per share data) Interest and dividend income: Loans: Discount accretion PCI – cash basis 398 $ 386 $ 112 Discount accretion PCI – other 407 797 631 Discount accretion PNCI 559 987 798 All other loan interest income 35,904 34,248 33,373 Total loan interest income 37,268 36,418 34,914 Debt securities, dividends and interest bearing cash at Banks (not FTE) 8,645 8,626 8,570 Total interest income 45,913 45,044 43,484 Interest expense 1,829 1,610 1,491 Net interest income 44,084 43,434 41,993 Provision for (benefit from reversal of provision for) loan losses 765 (796 ) (1,557 ) Net interest income after provision for loan losses 43,319 44,230 43,550 Noninterest income 12,930 12,910 11,703 Noninterest expense 37,222 35,904 35,822 Income before income taxes 19,027 21,236 19,431 Income tax expense 7,130 7,647 7,352 Net income $ 11,897 $ 13,589 $ 12,079 Per common share: Net income (diluted) $ 0.51 $ 0.58 $ 0.52 Dividends $ 0.17 $ 0.17 $ 0.15 2016 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 $ 483 $ 777 $ 426 $ 269 Discount accretion PCI – other 658 569 415 (45 ) Discount accretion PNCI 637 883 1,459 868 All other loan interest income 34,463 33,540 32,038 33,646 Total loan interest income 36,241 35,769 34,338 34,738 Debt securities, dividends and interest bearing cash at Banks (not FTE) 8,374 7,940 8,252 8,056 Total interest income 44,615 43,709 42,590 42,794 Interest expense 1,460 1,439 1,430 1,392 Net interest income 43,155 42,270 41,160 41,402 (Benefit from reversal of) provision for loan losses (1,433 ) (3,973 ) (773 ) 209 Net interest income after provision for loan losses 44,588 46,243 41,933 41,193 Noninterest income 12,462 11,066 11,245 9,790 Noninterest expense 36,563 37,416 38,267 33,751 Income before income taxes 20,487 19,893 14,911 17,232 Income tax expense 7,954 7,694 5,506 6,558 Net income $ 12,533 $ 12,199 $ 9,405 $ 10,674 Per common share: Net income (diluted) $ 0.54 $ 0.53 $ 0.41 $ 0.46 Dividends $ 0.15 $ 0.15 $ 0.15 $ 0.15

Subsequent Event

Subsequent Event	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	Note 31 – Subsequent Event On October 8, 2017, a series of wildfires broke out in several Northern California counties in which the Company conducts business. The hardest hit counties appear to be Sonoma and Napa counties with the City of Santa Rosa, and the surrounding Sonoma County area, being especially hard hit. It has been reported that several thousand homes and businesses have been destroyed as a result of these fires. As of October 24, 2017, the Company has identified 39 of its loans with total recorded balances of $15,808,000 that are collateralized by properties within the evacuation zones established for these fires. Of these 39 loans, 32 loans with recorded balances of $9,192,000 are collateralized by residential real estate, and seven loans with recorded balances of $6,616,000 are collateralized by commercial real estate. Properties serving as collateral for nine of the 32 residential real estate loans, and representing $2,636,000 of the recorded balance of loans, and properties serving as collateral for one of the seven commercial real estate loans, and representing $4,062,000 of the recorded balance of loans, have been identified as being partially or totally destroyed. It is the policy of the Company to require borrowers to maintain property & casualty insurance on properties that serve as collateral for the Company’s loans. Management is in the process of determining what the financial effects of these fires may have on the Company, but at this time, Management does not believe any such effects will be material to the Company’s financial condition or results of operations.

Summary of Significant Accoun40

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation TriCo Bancshares (the “Company” or “we”) 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. The Bank operates from 57 traditional branches and 9 in-store 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 $1,706,000 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	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. 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.
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 the three months ended September 30, 2017, the Company sold $24,796,000 of available for sale classified investment securities for $25,757,000 realizing a gain of $961,000. During the six months ended June 30, 2017 and throughout 2016, 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
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 original 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 specific reserve allocation within the allowance for loan losses. 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 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 re-graded Re-grading 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. 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 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality 310-30, 310-30 310-30 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, 310-20, 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 shorter of the estimated useful lives of the related assets or lease terms. Asset lives range from 3-10 15-40
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
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.
Low Income Housing Tax Credits	Low Income Housing Tax Credits The Company accounts for low income housing tax credits and the related qualified affordable housing projects using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). Upon entering into a qualified affordable housing project, the Company records, in other liabilities, the entire amount that it has agreed to invest in the project, and an equal amount, in other assets, representing its investment in the project. As the Company disburses cash to satisfy its investment obligation, other liabilities are reduced. Over time, as the tax credits and other tax benefits of the project are realized by the Company, the investment recorded in other assets is reduced using the proportional amortization method.
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 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 During the three months ended September 30, 2017, the Company changed its classification of 1 st nd non-owner 1-4 0.10%-0.20%
Recent Accounting Pronouncements	Recent Accounting Pronouncements FASB Accounting Standards Update (ASU) No.2014-09, Revenue from Contracts with Customers (Topic 606): 2014-09 2014-09 2014-09 FASB issued Accounting Standard Update (ASU) No. 2016-02, Leases (Topic 842) ASU 2016-2, on-balance ASU 2016-02 2016-02 FASB issued Accounting Standard Update (ASU) No. 2016-09 , Compensation – Stock Compensation (Topic 718). ASU 2016-09, ASU 2016-09 FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326) 2016-13 2016-13, 2016-13 available-for-sale 2016-13 2016-13 2016-13 2016-13 one-time one-time FASB issued ASU No. 2016-18, Statement of Cash Flows - Restricted Cash (Topic 230). ASU 2016-18 beginning-of-period end-of-period ASU 2016-18 FASB issued ASU No. 2017-01, Business Combinations - Clarifying the Definition of a Business (Topic 805). ASU 2017-01 ASU 2017-01 ASU 2017-01 FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment (Topic 350). 2017-04 ASU 2017-04 FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715). 2017-07 ASU 2017-07 FASB issued ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Topic 310). ASU 2017-08 non-pooled ASU 2017-08 ASU 2017-08 2016-08 FASB issued ASU 2017-09, Compensation - Stock Compensation (Topic 718). ASU 2017-09 ASU 2017-09, ASU 2017-09

Business Combinations (Tables)

Business Combinations (Tables) - Bank of America [Member]	9 Months Ended
	Sep. 30, 2017
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 acquisition of three branch banking offices and certain deposits from Bank of America on March 18, 2016: (in thousands) March 18, 2016 Fair value of consideration transferred: Cash consideration $ 3,204 Total fair value of consideration transferred 3,204 Asset acquired: Cash and cash equivalents 159,520 Loans 289 Premises and equipment 1,590 Core deposit intangible 2,046 Other assets 141 Total assets acquired 163,586 Liabilities assumed: Deposits 161,231 Total liabilities assumed 161,231 Total net assets acquired 2,355 Goodwill recognized $ 849
Summary of Cash Paid and Estimated Fair Value Adjustments Resulting in Goodwill	A summary of the cash paid and estimated fair value adjustments resulting in the goodwill recorded in the acquisition of three branch banking offices and certain deposits from Bank of America on March 18, 2016 are presented below: March 18, 2016 (in thousands) Cash paid $ 3,204 Cost basis net assets acquired — Fair value adjustments: Loans — Premises and Equipment (309 ) Core deposit intangible (2,046 ) Goodwill $ 849

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2017
Investments Schedule [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: September 30, 2017 Amortized Gross Gross Estimated (in thousands) Securities Available for Sale Obligations of U.S. government corporations and agencies $ 557,060 $ 1,321 $ (4,319 ) $ 554,062 Obligations of states and political subdivisions 121,635 1,182 (1,600 ) 121,217 Marketable equity securities 3,000 — (43 ) 2,957 Total securities available for sale $ 681,695 $ 2,503 $ (5,962 ) $ 678,236 Securities Held to Maturity Obligations of U.S. government corporations and agencies $ 521,999 $ 6,837 $ (1,442 ) $ 527,394 Obligations of states and political subdivisions 14,568 211 (50 ) 14,729 Total securities held to maturity $ 536,567 $ 7,048 $ (1,492 ) $ 542,123 December 31, 2016 Amortized Gross Gross Estimated (in thousands) Securities Available for Sale Obligations of U.S. government corporations and agencies $ 434,357 $ 1,949 $ (6,628 ) $ 429,678 Obligations of states and political subdivisions 121,746 267 (4,396 ) 117,617 Marketable equity securities 3,000 — (62 ) 2,938 Total securities available for sale $ 559,103 $ 2,216 $ (11,086 ) $ 550,233 Securities Held to Maturity Obligations of U.S. government corporations and agencies $ 587,982 $ 5,001 $ (4,199 ) $ 588,784 Obligations of states and political subdivisions 14,554 56 (191 ) 14,419 Total securities held to maturity $ 602,536 $ 5,057 $ (4,390 ) $ 603,203
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 Cost Fair Value Cost Fair Value Due in one year $ 2 $ 2 — — Due after one year through five years 206 206 $ 1,199 $ 1,233 Due after five years through ten years 2,223 2,279 4,098 4,165 Due after ten years 679,264 675,749 531,270 536,725 Totals $ 681,695 $ 678,236 $ 536,567 $ 542,123
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 September 30, 2017 Value Loss Value Loss Value Loss (in thousands) Securities Available for Sale: Obligations of U.S. government corporations and agencies $ 365,252 $ (4,319 ) — — $ 365,252 $ (4,319 ) Obligations of states and political subdivisions 31,937 (903 ) $ 8,905 $ (697 ) 40,842 (1,600 ) Marketable equity securities 2,957 (43 ) — — 2,957 (43 ) Total securities available-for-sale $ 400,146 $ (5,265 ) $ 8,905 $ (697 ) $ 409,051 $ (5,962 ) Securities Held to Maturity: Obligations of U.S. government corporations and agencies $ 133,453 $ (1,442 ) — — $ 133,453 $ (1,442 ) Obligations of states and political subdivisions 3,197 (50 ) — — 3,179 (50 ) Total securities held-to-maturity $ 136,650 $ (1,492 ) — — $ 136,650 $ (1,492 ) Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized December 31, 2016 Value Loss Value Loss Value Loss (in thousands) Securities Available for Sale: Obligations of U.S. government corporations and agencies $ 370,389 $ (6,628 ) — — $ 370,389 $ (6,628 ) Obligations of states and political subdivisions 90,825 (4,396 ) — — 90,825 (4,396 ) Marketable equity securities 2,938 (62 ) — — 2,938 (62 ) Total securities available-for-sale $ 464,152 $ (11,086 ) — — $ 464,152 $ (11,086 ) Securities Held to Maturity: Obligations of U.S. government corporations and agencies $ 280,497 $ (4,199 ) — — $ 280,497 $ (4,199 ) Obligations of states and political subdivisions 9,984 (191 ) — — 9,984 (191 ) Total securities held-to-maturity $ 290,481 $ (4,390 ) — — $ 290,481 $ (4,390 )

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Summary of Loan Balances	A summary of loan balances follows (in thousands): September 30, 2017 PCI - PCI - Originated PNCI Cash basis Other Total Mortgage loans on real estate: Residential 1-4 $ 321,852 $ 67,815 — $ 1,405 $ 391,072 Commercial 1,588,790 206,841 — 8,171 1,803,802 Total mortgage loan on real estate 1,910,642 274,656 — 9,576 2,194,874 Consumer: Home equity lines of credit 269,470 17,084 $ 2,209 743 289,506 Home equity loans 41,486 2,810 — 737 45,033 Other 24,435 2,302 — 44 26,781 Total consumer loans 335,391 22,196 2,209 1,524 361,320 Commercial 215,946 8,838 — 2,695 227,479 Construction: Residential 75,108 12 — — 75,120 Commercial 69,452 3,368 — — 72,820 Total construction 144,560 3,380 — — 147,940 Total loans, net of deferred loan fees and discounts $ 2,606,539 $ 309,070 $ 2,209 $ 13,795 $ 2,931,613 Total principal balance of loans owed, net of charge-offs $ 2,614,521 $ 316,657 $ 6,519 $ 17,626 $ 2,955,323 Unamortized net deferred loan fees (7,982 ) — — — (7,982 ) Discounts to principal balance of loans owed, net of charge-offs — (7,587 ) (4,310 ) (3,831 ) (15,728 ) Total loans, net of deferred loan fees and discounts $ 2,606,539 $ 309,070 $ 2,209 $ 13,795 $ 2,931,613 Noncovered loans $ 2,606,539 $ 309,070 $ 2,209 $ 13,795 $ 2,931,613 Covered loans — — — — — Total loans, net of deferred loan fees and discounts $ 2,606,539 $ 309,070 $ 2,209 $ 13,795 $ 2,931,613 Allowance for loan losses $ (27,417 ) $ (1,043 ) $ (12 ) $ (275 ) $ (28,747 ) A summary of loan balances follows (in thousands): December 31, 2016 PCI - PCI - Originated PNCI Cash basis Other Total Mortgage loans on real estate: Residential 1-4 $ 284,539 $ 82,335 — $ 1,469 $ 368,343 Commercial 1,425,828 246,491 — 12,802 1,685,121 Total mortgage loan on real estate 1,710,367 328,826 — 14,271 2,053,464 Consumer: Home equity lines of credit 263,590 21,765 $ 2,983 1,377 289,715 Home equity loans 40,736 3,764 — 1,682 46,182 Other 28,167 2,534 — 65 30,766 Total consumer loans 332,493 28,063 2,983 3,124 366,663 Commercial 200,735 12,321 — 3,991 217,047 Construction: Residential 54,613 141 — 675 55,429 Commercial 58,119 8,871 — — 66,990 Total construction 112,732 9,012 — 675 122,419 Total loans, net of deferred loan fees and discounts $ 2,356,327 $ 378,222 $ 2,983 $ 22,061 $ 2,759,593 Total principal balance of loans owed, net of charge-offs $ 2,363,243 $ 388,139 $ 8,280 $ 25,650 $ 2,785,312 Unamortized net deferred loan fees (6,916 ) — — — (6,916 ) Discounts to principal balance of loans owed, net of charge-offs — (9,917 ) (5,297 ) (3,589 ) (18,803 ) Total loans, net of unamortized deferred loan fees and discounts $ 2,356,327 $ 378,222 $ 2,983 $ 22,061 $ 2,759,593 Noncovered loans $ 2,356,327 $ 378,222 $ 2,983 $ 18,885 $ 2,756,417 Covered loans — — — 3,176 3,176 Total loans, net of unamortized deferred loan fees and discounts $ 2,356,327 $ 378,222 $ 2,983 $ 22,061 $ 2,759,593 Allowance for loan losses $ (28,141 ) $ (1,665 ) $ (17 ) $ (2,680 ) $ (32,503 )
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): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Change in accretable yield: Balance at beginning of period $ 7,956 $ 11,775 $ 10,348 $ 13,255 Accretion to interest income (594 ) (961 ) (2,554 ) (3,068 ) Reclassification (to) from nonaccretable difference (2,893 ) (160 ) (3,325 ) 467 Balance at end of period $ 4,469 $ 10,654 $ 4,469 $ 10,654

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2017
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 – Three Months Ended September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Beginning balance $ 2,495 $ 10,119 $ 6,156 $ 2,354 $ 645 $ 4,729 $ 1,179 $ 466 $ 28,143 Charge-offs (60 ) (20 ) (14 ) (94 ) (349 ) (291 ) (33 ) — (861 ) Recoveries — 238 189 121 91 61 — — 700 (Benefit) provision (217 ) 1,033 (610 ) (390 ) 203 303 284 159 765 Ending balance $ 2,218 $ 11,370 $ 5,721 $ 1,991 $ 590 $ 4,802 $ 1,430 $ 625 $ 28,747 Allowance for Loan Losses – Nine Months Ended September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Beginning balance $ 2,748 $ 11,517 $ 7,044 $ 2,644 $ 622 $ 5,831 $ 1,417 $ 680 $ 32,503 Charge-offs (60 ) (170 ) (98 ) (331 ) (831 ) (1,188 ) (1,104 ) — (3,782 ) Recoveries — 365 487 146 300 315 — 1 1,614 (Benefit) provision (470 ) (342 ) (1,712 ) (468 ) 499 (156 ) 1,117 (56 ) (1,588 ) Ending balance $ 2,218 $ 11,370 $ 5,721 $ 1,991 $ 590 $ 4,802 $ 1,430 $ 625 $ 28,747 Ending balance: Individ. evaluated for impairment $ 240 $ 73 $ 363 $ 111 $ 77 $ 1,276 — — $ 2,140 Loans pooled for evaluation $ 1,978 $ 11,022 $ 5,347 $ 1,879 $ 513 $ 3,526 $ 1,430 $ 625 $ 26,320 Loans acquired with deteriorated credit quality — $ 275 $ 12 — — — — — $ 287 Loans, net of unearned fees – As of September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Ending balance: Total loans $ 391,072 $ 1,803,802 $ 289,506 $ 45,033 $ 26,781 $ 227,479 $ 75,120 $ 72,820 $ 2,931,613 Individ. evaluated for impairment $ 5,027 $ 19,788 $ 2,219 $ 1,842 $ 267 $ 2,938 $ 144 — $ 32,225 Loans pooled for evaluation $ 384,640 $ 1,775,843 $ 284,335 $ 42,454 $ 26,470 $ 221,846 $ 74,976 $ 72,820 $ 2,883,384 Loans acquired with deteriorated credit quality $ 1,405 $ 8,171 $ 2,952 $ 737 $ 44 $ 2,695 — — $ 16,004 Allowance for Loan Losses – Year Ended December 31, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Beginning balance $ 2,896 $ 11,015 $ 11,253 $ 3,177 $ 688 $ 5,271 $ 899 $ 812 $ 36,011 Charge-offs (321 ) (827 ) (585 ) (219 ) (823 ) (455 ) — — (3,230 ) Recoveries 880 920 2,317 590 449 404 54 78 5,692 (Benefit) provision (694 ) 395 (5,940 ) (903 ) 308 611 463 (210 ) (5,970 ) Ending balance $ 2,761 $ 11,503 $ 7,045 $ 2,645 $ 622 $ 5,831 $ 1,416 $ 680 $ 32,503 Ending balance: Individ. evaluated for impairment $ 258 $ 4 $ 411 $ 215 $ 28 $ 1,130 — — $ 2,046 Loans pooled for evaluation $ 2,317 $ 10,050 $ 6,617 $ 2,366 $ 594 $ 3,765 $ 1,371 $ 680 $ 27,760 Loans acquired with deteriorated credit quality $ 186 $ 1,449 $ 17 $ 64 — $ 936 $ 45 — $ 2,697 Loans, net of unearned fees – As of December 31, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Ending balance: Total loans $ 368,343 $ 1,685,121 $ 289,715 $ 46,182 $ 30,766 $ 217,047 $ 55,429 $ 66,990 $ 2,759,593 Individ. evaluated for impairment $ 4,094 $ 15,081 $ 3,196 $ 1,508 $ 154 $ 4,096 $ 11 — $ 28,140 Loans pooled for evaluation $ 362,780 $ 1,657,238 $ 282,159 $ 42,992 $ 30,547 $ 208,960 $ 54,743 $ 66,990 $ 2,706,409 Loans acquired with deteriorated credit quality $ 1,469 $ 12,802 $ 4,360 $ 1,682 $ 65 $ 3,991 $ 675 — $ 25,044 Allowance for Loan Losses – Three Months Ended September 30, 2016 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Beginning balance $ 3,081 $ 11,934 $ 9,203 $ 3,057 — $ 696 $ 5,265 $ 1,321 $ 952 $ 35,509 Charge-offs (50 ) — (122 ) (25 ) — (160 ) (307 ) — — (664 ) Recoveries 391 20 1,580 429 — 107 85 — — 2,612 (Benefit) provision (653 ) (378 ) (2,261 ) (360 ) — 24 199 (16 ) (528 ) (3,973 ) Ending balance $ 2,769 $ 11,576 $ 8,400 $ 3,101 — $ 667 $ 5,242 $ 1,305 $ 424 $ 33,484 Allowance for Loan Losses – Nine Months Ended September 30, 2016 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Beginning balance $ 2,896 $ 11,015 $ 11,253 $ 3,177 — $ 688 $ 5,271 $ 899 $ 812 $ 36,011 Charge-offs (212 ) (793 ) (450 ) (118 ) — (600 ) (421 ) — — (2,594 ) Recoveries 618 902 1,921 501 — 338 323 — 1 4,604 (Benefit) provision (533 ) 452 (4,324 ) (459 ) — 241 69 406 (389 ) (4,537 ) Ending balance $ 2,769 $ 11,576 $ 8,400 $ 3,101 — $ 667 $ 5,242 $ 1,305 $ 424 $ 33,484 Ending balance: Individ. evaluated for impairment $ 418 $ 644 $ 511 $ 311 — $ 72 $ 822 — — $ 2,778 Loans pooled for evaluation $ 2,157 $ 9,493 $ 7,864 $ 2,730 — $ 595 $ 3,426 $ 1,257 $ 424 $ 27,946 Loans acquired with deteriorated credit quality $ 181 $ 1,453 $ 25 $ 59 — — $ 994 $ 48 — $ 2,760 Loans, net of unearned fees – As of September 30, 2016 RE Mortgage Home Equity Auto Other Construction (in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Ending balance: Total loans $ 368,223 $ 1,625,897 $ 301,884 $ 48,314 — $ 31,611 $ 217,110 $ 57,892 $ 61,295 $ 2,712,226 Individ. evaluated for impairment $ 5,414 $ 14,706 $ 3,820 $ 2,650 — $ 278 $ 2,397 $ 11 — $ 29,276 Loans pooled for evaluation $ 361,336 $ 1,597,876 $ 292,833 $ 43,552 — $ 31,272 $ 210,565 $ 57,338 $ 61,295 $ 2,656,067 Loans acquired with deteriorated credit quality $ 1,473 $ 13,315 $ 5,231 $ 2,112 — $ 61 $ 4,148 $ 543 — $ 26,883
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 September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Originated loans: Pass $ 317,577 $ 1,553,178 $ 266,066 $ 38,885 $ 23,978 $ 209,215 $ 75,000 $ 60,921 $ 2,544,820 Special mention 1,831 13,484 2,196 815 368 3,390 — 8,531 30,615 Substandard 2,444 22,128 1,208 1,786 89 3,341 108 — 31,104 Loss — — — — — — — — — Total originated $ 321,852 $ 1,588,790 $ 269,470 $ 41,486 $ 24,435 $ 215,946 $ 75,108 $ 69,452 $ 2,606,539 PNCI loans: Pass $ 65,700 $ 191,518 $ 15,832 $ 2,534 $ 2,257 $ 8,832 $ 12 $ 3,368 $ 290,053 Special mention 223 13,155 452 209 39 — — — 14,078 Substandard 1,892 2,168 800 67 6 6 — — 4,939 Loss — — — — — — — — — Total PNCI $ 67,815 $ 206,841 $ 17,084 $ 2,810 $ 2,302 $ 8,838 $ 12 $ 3,368 $ 309,070 PCI loans $ 1,405 $ 8,171 $ 2,952 $ 737 $ 44 $ 2,695 — — $ 16,004 Total loans $ 391,072 $ 1,803,802 $ 289,506 $ 45,033 $ 26,781 $ 227,479 $ 75,120 $ 72,820 $ 2,931,613 Credit Quality Indicators – As of December 31, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Originated loans: Pass $ 278,635 $ 1,399,936 $ 258,024 $ 37,844 $ 27,542 $ 190,902 $ 54,602 $ 57,808 $ 2,305,293 Special mention 2,992 14,341 2,518 891 385 6,133 — 311 27,571 Substandard 2,912 11,551 3,048 2,001 240 3,700 11 — 23,463 Loss — — — — — — — — — Total originated $ 284,539 $ 1,425,828 $ 263,590 $ 40,736 $ 28,167 $ 200,735 $ 54,613 $ 58,119 $ 2,356,327 PNCI loans: Pass $ 79,000 $ 233,326 $ 20,442 $ 3,506 $ 2,437 $ 12,320 $ 141 $ 8,871 $ 360,043 Special mention 1,849 5,925 509 173 92 1 — — 8,549 Substandard 1,486 7,240 814 85 5 — — — 9,630 Loss — — — — — — — — — Total PNCI $ 82,335 $ 246,491 $ 21,765 $ 3,764 $ 2,534 $ 12,321 $ 141 $ 8,871 $ 378,222 PCI loans $ 1,469 $ 12,802 $ 4,360 $ 1,682 $ 65 $ 3,991 $ 675 — $ 25,044 Total loans $ 368,343 $ 1,685,121 $ 289,715 $ 46,182 $ 30,766 $ 217,047 $ 55,429 $ 66,990 $ 2,759,593
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 September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Originated loan balance: Past due: 30-59 $ 721 $ 2,241 $ 695 $ 662 $ 150 $ 362 — — $ 4,831 60-89 403 793 299 — 83 1 — — 1,579 > 90 Days 343 744 82 468 1 407 — — 2,045 Total past due 1,467 3,778 1,076 1,130 234 770 — — 8,455 Current 320,385 1,585,012 268,394 40,356 24,201 215,176 75,108 69,452 2,598,084 Total orig. loans $ 321,852 $ 1,588,790 $ 269,470 $ 41,486 $ 24,435 $ 215,946 $ 75,108 $ 69,452 $ 2,606,539 > 90 Days and still accruing — — — — — — — — — Nonaccrual loans $ 1,037 $ 6,954 $ 534 $ 1,199 $ 13 $ 1,951 — — $ 11,688 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 September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total PNCI loan balance: Past due: 30-59 $ 39 — $ 100 $ 27 $ 12 — — — $ 178 60-89 159 1,599 129 18 5 1 — — 1,911 > 90 Days 1,021 — — — — 6 — — $ 1,027 Total past due 1,219 1,599 229 45 17 7 — — 3,116 Current 66,596 205,242 16,855 2,765 2,285 8,831 12 3,368 305,954 Total PNCI loans $ 67,815 $ 206,841 $ 17,084 $ 2,810 $ 2,302 $ 8,838 $ 12 $ 3,368 $ 309,070 > 90 Days and still accruing — — — — — — — — — Nonaccrual loans $ 1,089 $ 1,599 $ 276 $ 50 $ 6 $ 6 — — $ 3,026 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, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Originated loan balance: Past due: 30-59 $ 552 $ 317 $ 754 $ 646 $ 16 $ 1,148 $ 921 — $ 4,354 60-89 269 1,387 — 395 30 84 — $ 421 2,586 > 90 Days — 216 687 184 15 634 11 — 1,747 Total past due 821 1,920 1,441 1,225 61 1,866 932 421 8,687 Current 283,718 1,423,908 262,149 39,511 28,106 198,869 53,681 57,698 2,347,640 Total orig. loans $ 284,539 $ 1,425,828 $ 263,590 $ 40,736 $ 28,167 $ 200,735 $ 54,613 $ 58,119 $ 2,356,327 > 90 Days and still accruing — — — — — — — — — Nonaccrual loans $ 255 $ 7,651 $ 1,211 $ 803 $ 33 $ 2,930 $ 11 — $ 12,894 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, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total PNCI loan balance: Past due: 30-59 $ 1,510 $ 73 $ 274 $ 39 — — — — $ 1,896 60-89 — — — — — — — — — > 90 Days 21 81 589 13 — — — — 704 Total past due 1,531 154 863 52 — — — — 2,600 Current 80,804 246,337 20,902 3,712 $ 2,534 $ 12,321 $ 141 $ 8,871 375,622 Total PNCI loans $ 82,335 $ 246,491 $ 21,765 $ 3,764 $ 2,534 $ 12,321 $ 141 $ 8,871 $ 378,222 > 90 Days and still accruing — — — — — — — — — Nonaccrual loans $ 194 $ 1,826 $ 742 $ 67 $ 5 — — — $ 2,834
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 original 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, or for the Nine Months Ended, September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 1,777 $ 17,039 $ 1,108 $ 1,470 $ 3 $ 884 $ 144 — $ 22,425 Unpaid principal $ 1,819 $ 17,493 $ 1,209 $ 1,892 $ 47 $ 1,139 $ 144 — $ 23,743 Average recorded Investment $ 1,734 $ 15,092 $ 1,294 $ 1,034 $ 9 $ 823 $ 78 — $ 20,064 Interest income Recognized $ 51 $ 474 $ 25 $ 25 ($ 25 ) $ 16 $ 7 — $ 573 With an allowance recorded: Recorded investment $ 1,644 $ 1,150 $ 110 $ 199 $ 11 $ 2,048 — — $ 5,162 Unpaid principal $ 1,670 $ 1,150 $ 115 $ 199 $ 12 $ 2,123 — — $ 5,269 Related allowance $ 167 $ 73 $ 33 $ 13 $ 7 $ 1,270 — — $ 1,563 Average recorded Investment $ 1,508 $ 898 $ 270 $ 342 $ 14 $ 2,691 — — $ 5,723 Interest income Recognized $ 39 $ 40 — $ 7 — $ 53 — — $ 139 Impaired PNCI Loans – As of, or for the Nine Months Ended, September 30, 2017 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 1,356 $ 1,599 $ 394 $ 50 — — — — $ 3,399 Unpaid principal $ 1,384 $ 1,869 $ 413 $ 62 — — — — $ 3,728 Average recorded Investment $ 910 $ 1,712 $ 564 $ 59 $ 2 — — — $ 3,247 Interest income Recognized $ 17 — $ 8 — — — — — $ 25 With an allowance recorded: Recorded investment $ 250 — $ 607 $ 123 $ 253 $ 6 — — $ 1,239 Unpaid principal $ 250 — $ 607 $ 123 $ 253 $ 6 — — $ 1,239 Related allowance $ 73 — $ 328 $ 99 $ 71 $ 6 — — $ 577 Average recorded Investment $ 255 $ 66 $ 579 $ 62 $ 185 $ 3 — — $ 1,150 Interest income Recognized $ 7 — $ 20 $ 5 $ 8 — — — $ 40 Impaired Originated Loans – As of December 31, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 1,821 $ 12,897 $ 1,480 $ 715 $ 15 $ 762 $ 11 — $ 17,701 Unpaid principal $ 1,829 $ 13,145 $ 1,561 $ 1,135 $ 29 $ 926 $ 16 — $ 18,641 Average recorded Investment $ 2,853 $ 20,003 $ 2,221 $ 831 $ 17 $ 669 $ 7 — $ 26,601 Interest income Recognized $ 92 $ 570 $ 40 $ 6 $ 1 $ 48 — — $ 757 With an allowance recorded: Recorded investment $ 1,551 $ 357 $ 430 $ 594 $ 19 $ 3,334 — — $ 6,285 Unpaid principal $ 1,552 $ 357 $ 440 $ 596 $ 19 $ 3,385 — — $ 6,349 Related allowance $ 180 $ 4 $ 110 $ 107 $ 13 $ 1,130 — — $ 1,544 Average recorded Investment $ 1,779 $ 888 $ 1,076 $ 634 $ 9 $ 2,714 — — $ 7,100 Interest income Recognized $ 65 $ 22 $ 9 $ 31 $ 2 $ 77 — — $ 206 Impaired PNCI Loans – As of December 31, 2016 RE Mortgage Home Equity Other Construction (in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total With no related allowance recorded: Recorded investment $ 463 $ 1,826 $ 735 $ 67 $ 3 — — — $ 3,094 Unpaid principal $ 486 $ 2,031 $ 746 $ 74 $ 4 — — — $ 3,341 Average recorded Investment $ 669 $ 1,479 $ 594 $ 69 $ 18 $ 1 — $ 245 $ 3,075 Interest income Recognized $ 7 — $ 9 $ 1 — — — — $ 17 With an allowance recorded: Recorded investment $ 259 — $ 551 $ 132 $ 118 — — — $ 1,060 Unpaid principal $ 259 — $ 551 $ 132 $ 118 — — — $ 1,060 Related allowance $ 79 — $ 300 $ 108 $ 15 — — — $ 502 Average recorded Investment $ 130 $ 1,374 $ 579 $ 85 $ 176 — — — $ 2,344 Interest income Recognized $ 10 — $ 27 $ 7 $ 5 — — — $ 49 Impaired Originated Loans – As of, or for the Nine Months Ended, September 30, 2016 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 $ 2,392 $ 7,011 $ 1,888 $ 1,360 — $ 7 $ 574 $ 11 — $ 13,243 Unpaid principal $ 3,083 $ 7,286 $ 2,318 $ 1,979 — $ 11 $ 749 $ 16 — $ 15,442 Average recorded Investment $ 3,139 $ 17,059 $ 2,425 $ 1154 $ 1 $ 12 $ 575 $ 7 — $ 24,372 Interest income Recognized $ 63 $ 232 $ 26 $ 9 — — $ 26 — — $ 356 With an allowance recorded: Recorded investment $ 2,613 $ 5,820 $ 923 $ 1,059 — $ 8 $ 1,823 — — $ 12,246 Unpaid principal $ 2,701 $ 5,843 $ 931 $ 1,115 — $ 8 $ 1,869 — — $ 12,467 Related allowance $ 381 $ 644 $ 263 $ 201 — $ 3 $ 822 — — $ 2,314 Average recorded Investment $ 2,309 $ 3,620 $ 1,324 $ 866 — $ 4 $ 1,959 — — $ 10,082 Interest income Recognized $ 68 $ 216 $ 16 $ 36 — — $ 55 — — $ 391 Impaired PNCI Loans – As of, or for the Nine Months Ended, September 30, 2016 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 $ 474 $ 1,874 $ 502 $ 97 — $ 6 — — — $ 2,953 Unpaid principal $ 492 $ 2,048 $ 573 $ 103 — $ 7 — — — $ 3,223 Average recorded Investment $ 674 $ 1,503 $ 478 $ 84 — $ 19 $ 1 — $ 245 $ 3,004 Interest income Recognized $ 7 — $ 2 $ 1 — — — — — $ 10 With an allowance recorded: Recorded investment $ 263 — $ 507 $ 134 — $ 257 — — — $ 1,161 Unpaid principal $ 263 — $ 507 $ 134 — $ 257 — — — $ 1,161 Related allowance $ 81 — $ 248 $ 109 — $ 69 — — — $ 507 Average recorded Investment $ 131 $ 1,374 $ 557 $ 86 — $ 246 — — — $ 2,394 Interest income Recognized $ 7 — $ 16 $ 5 — $ 8 — — — $ 36
Troubled Debt Restructurings	The following tables show certain information regarding Troubled Debt Restructurings (TDRs) that occurred during the periods indicated: TDR Information for the Three Months Ended September 30, 2017 RE Mortgage Home Equity Other Construction ($ in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Number 1 4 — 1 — 8 1 — 15 Pre-mod $ 939 $ 2,886 — $ 252 — $ 1,109 $ 144 — $ 5,330 Post-mod $ 939 $ 2,886 — $ 252 — $ 1,109 $ 144 — $ 5,330 Financial impact due to TDR taken as additional provision $ 169 $ 14 — — — $ 28 — — $ 211 Number that defaulted during the period 1 1 — — — — — — 2 Recorded investment of TDRs that defaulted during the period $ 99 $ 219 — — — — — — $ 318 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — — — — — — — TDR Information for the Nine Months Ended September 30, 2017 RE Mortgage Home Equity Other Construction ($ in thousands) Resid. Comm. Lines Loans Consum. C&I Resid. Comm. Total Number 1 7 3 1 1 11 1 — 25 Pre-mod $ 939 $ 3,509 $ 187 $ 252 $ 14 $ 1,854 $ 144 — $ 6,898 Post-mod $ 939 $ 3,482 $ 187 $ 252 $ 14 $ 1,748 $ 144 — $ 6,765 Financial impact due to TDR taken as additional provision $ 169 $ (111 ) $ 27 — $ 11 $ 37 — — $ 133 Number that defaulted during the period 2 1 — — — — — — 3 Recorded investment of TDRs that defaulted during the period $ 223 $ 219 — — — — — — $ 442 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — — — — — — — TDR Information for the Three Months Ended September 30, 2016 RE Mortgage Home Equity Auto Other Construction ($ in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Number 2 2 2 — — 1 3 — — 10 Pre-mod $ 318 $ 170 $ 113 — — $ 8 $ 65 — — $ 674 Post-mod $ 324 $ 170 $ 114 — — $ 8 $ 66 — — $ 682 Financial impact due to TDR taken as additional provision $ 6 — — — — — $ 15 — — $ 21 Number that defaulted during the period 1 — 1 — — — — — — 2 Recorded investment of TDRs that defaulted during the period $ 14 — $ 229 — — — — — — $ 243 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — — — — — — — — The following tables show certain information regarding TDRs that occurred during the periods indicated: TDR Information for the Nine Months Ended September 30, 2016 RE Mortgage Home Equity Auto Other Construction ($ in thousands) Resid. Comm. Lines Loans Indirect Consum. C&I Resid. Comm. Total Number 3 3 9 3 — 2 4 — — 24 Pre-mod $ 650 $ 248 $ 707 $ 280 — $ 27 $ 77 — — $ 1,989 Post-mod $ 656 $ 249 $ 709 $ 317 — $ 27 $ 77 — — $ 2,035 Financial impact due to TDR taken as additional provision $ 50 — $ 205 $ 46 — $ 2 $ 23 — — $ 326 Number that defaulted during the period 2 — 1 — — — — — — 3 Recorded investment of TDRs that defaulted during the period $ 101 — $ 229 — — — — — — $ 330 Financial impact due to the default of previous TDR taken as charge-offs or additional provisions — — — — — — — — — —

Foreclosed Assets (Tables)

Foreclosed Assets (Tables)	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Summary of Activity in Balance of Foreclosed Assets	A summary of the activity in the balance of foreclosed assets follows (in thousands): Nine months ended September 30, 2017 Nine months ended September 30, 2016 Noncovered Covered Total Noncovered Covered Total Beginning balance, net $ 3,763 $ 223 $ 3,986 $ 5,369 — $ 5,369 Additions/transfers from loans 726 — 726 1,730 $ 223 1,953 Dispositions/sales (1,256 ) (223 ) (1,479 ) (3,157 ) — (3,157 ) Valuation adjustments (162 ) — (162 ) (41 ) — (41 ) Ending balance, net $ 3,701 — $ 3,071 $ 3,901 $ 223 $ 4,124 Ending valuation allowance $ (248 ) — $ (248 ) $ (241 ) — $ (241 ) Ending number of foreclosed assets 11 — 11 14 1 15 Proceeds from sale of foreclosed assets $ 1,571 $ 216 $ 1,787 $ 3,375 — $ 3,375 Gain (loss) on sale of foreclosed assets $ 315 (7 ) $ 308 $ 218 — $ 218

Premises and Equipment (Tables)

Premises and Equipment (Tables)	9 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	Premises and equipment were comprised of: September 30, December 31, 2017 2016 (In thousands) Land & land improvements $ 10,021 $ 9,522 Buildings 43,860 42,345 Furniture and equipment 34,530 31,428 88,411 83,295 Less: Accumulated depreciation (39,892 ) (37,412 ) 48,519 45,883 Construction in progress 6,476 2,523 Total premises and equipment $ 54,995 $ 48,406

Cash Value of Life Insurance (T

Cash Value of Life Insurance (Tables)	9 Months Ended
	Sep. 30, 2017
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 (in thousands): Nine months ended September 30, 2017 2016 Beginning balance $ 95,912 $ 94,560 Increase in cash value of life insurance 2,043 2,086 Death benefit receivable in excess of cash value 108 238 Death benefit receivable (921 ) (1,603 ) Ending balance $ 97,142 $ 95,281 End of period death benefit $ 165,006 $ 166,623 Number of policies owned 183 187 Insurance companies used 14 14 Current and former employees and directors covered 57 58

Goodwill and Other Intangible48

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Goodwill Intangible	The following table summarizes the Company’s goodwill intangible as of the dates indicated: September 30, December 31, (dollar in thousands) 2017 Additions Reductions 2016 Goodwill $ 64,311 — — $ 64,311
Summary of Core Deposit Intangibles	The following table summarizes the Company’s core deposit intangibles as of the dates indicated: September 30, Reductions/ Fully December 31, (dollar in thousands) 2017 Additions Amortization Depreciated 2016 Core deposit intangibles $ 9,558 — — $ (562 ) $ 10,120 Accumulated amortization (4,045 ) — $ (1,050 ) $ 562 (3,557 ) Core deposit intangibles, net $ 5,513 — $ (1,050 ) — $ 6,563
Remaining Estimated Core Deposit Intangible Amortization	The following table summarizes the Company’s remaining estimated core deposit intangible amortization (dollars in thousands): Estimated Core Deposit Periods Ended Intangible Amortization 2017 $ 339 2018 1,324 2019 1,228 2020 1,228 2021 969 Thereafter 425

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Fair Value of Mortgage Servicing Rights	The following tables summarize the activity in, and the main assumptions used to determine the fair value of mortgage servicing rights (“MSRs”) for the periods indicated (dollars in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Mortgage servicing rights: Balance at beginning of period $ 6,596 $ 6,720 $ 6,595 $ 7,618 Additions 147 287 619 788 Change in fair value (324 ) (799 ) (795 ) (2,198 ) Balance at end of period $ 6,419 $ 6,208 $ 6,419 $ 6,208 Servicing, late and ancillary fees received $ 513 $ 480 $ 1,560 $ 1,513 Balance of loans serviced at: Beginning of period $ 822,549 $ 814,702 $ 816,623 $ 817,917 End of period $ 812,005 $ 811,128 $ 812,005 $ 811,128 Period end: Weighted-average prepayment speed (CPR) 9.2 % 12.8 % Discount rate 14.0 % 12.0 %

Indemnification Asset (Tables)

Indemnification Asset (Tables)	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Summary of Activity in Balance of Indemnification Asset (Liability)	A summary of the activity in the balance of indemnification asset (liability) follows (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Beginning (payable) receivable balance — $ (662 ) $ (744 ) $ (521 ) Effect of actual covered losses and change in estimated future covered losses — 17 (224 ) (245 ) Reimbursable expenses (revenue), net — — 256 (4 ) Payments made (received) — 107 — 232 Gain on termination of loss share agreement — — 712 — Ending (payable) receivable balance — $ (538 ) — $ (538 ) Amount of indemnification asset recorded in other assets — $ 95 Amount of indemnification liability recorded in other liabilities — (633 ) Ending balance — $ (538 )

Other Assets (Tables)

Other Assets (Tables)	9 Months Ended
	Sep. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Summary of Other Assets	Other assets were comprised of (in thousands): September 30, December 31, 2017 2016 Deferred tax asset, net $ 33,091 $ 36,199 Prepaid expense 3,912 3,045 Software 1,563 2,039 Advanced compensation — 249 Capital Trusts 1,706 1,702 Investment in Low Housing Tax Credit Funds 17,453 18,465 Life insurance proceeds receivable 2,242 2,120 Tax refund receivable — 6,460 Premises held for sale — 2,896 Due from broker 25,757 — Miscellaneous other assets 1,212 1,568 Total other assets $ 86,936 $ 74,743

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
Summary of Balances of Deposits	A summary of the balances of deposits follows (in thousands): September 30 December 31, 2017 2016 Noninterest-bearing demand $ 1,283,949 $ 1,275,745 Interest-bearing demand 965,480 887,625 Savings 1,367,597 1,397,036 Time certificates, over $250,000 74,944 75,184 Other time certificates 235,486 259,970 Total deposits $ 3,927,456 $ 3,895,560

Reserve for Unfunded Commitme53

Reserve for Unfunded Commitments (Tables)	9 Months Ended
	Sep. 30, 2017
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): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Balance at beginning of period $ 2,599 $ 2,883 $ 2,719 $ 2,475 Provision for losses – unfunded commitments 390 25 270 433 Balance at end of period $ 2,989 $ 2,908 $ 2,989 $ 2,908

Other Liabilities (Tables)

Other Liabilities (Tables)	9 Months Ended
	Sep. 30, 2017
Other Liabilities Disclosure [Abstract]
Components of Other Liabilities	Other liabilities were comprised of (in thousands): September 30, December 31, 2017 2016 Deferred compensation $ 6,431 $ 6,525 Pension liability 27,238 26,645 Joint beneficiary agreements 3,192 3,007 Low income housing tax credit fund commitments 11,439 15,176 Accrued salaries and benefits expense 6,176 5,704 Loan escrow and servicing payable 2,264 2,146 Deferred Revenue 1,759 726 Litigation contingency 1,450 1,450 Miscellaneous other liabilities 2,901 5,985 Total other liabilities $ 62,850 $ 67,364

Other Borrowings (Tables)

Other Borrowings (Tables)	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Summary of Balances of Other Borrowings	A summary of the balances of other borrowings follows: September 30, December 31, 2017 2016 (in thousands) FHLB collateralized borrowing, fixed rate, as of September 30, 2017 of 1.11%, payable on October 2, 2017 $ 85,737 — Other collateralized borrowings, fixed rate, as of September 30, 2017 of 0.05%, payable on October 2, 2017 12,993 $ 17,493 Total other borrowings $ 98,730 $ 17,493

Junior Subordinated Debt (Table

Junior Subordinated Debt (Tables)	9 Months Ended
	Sep. 30, 2017
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): Coupon Rate As of September 30, 2017 December 31, 2016 Subordinated Maturity Face (Variable) Current Recorded Recorded Debt Series Date Value 3 mo. LIBOR + Coupon Rate Book Value Book Value TriCo Cap Trust I 10/7/2033 $ 20,619 3.05 % 4.35 % $ 20,619 $ 20,619 TriCo Cap Trust II 7/23/2034 20,619 2.55 % 3.86 % 20,619 20,619 North Valley Trust II 4/24/2033 6,186 3.25 % 4.56 % 5,125 5,095 North Valley Trust III 4/24/2034 5,155 2.80 % 4.11 % 4,032 4,005 North Valley Trust IV 3/15/2036 10,310 1.33 % 2.65 % 6,415 6,329 $ 62,889 $ 56,810 $ 56,667

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2017
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, 2016, future minimum commitments under non-cancelable Operating Leases (in thousands) 2017 $ 3,320 2018 2,523 2019 1,924 2020 1,325 2021 963 Thereafter 1,696 Future minimum lease payments $ 11,751
Summary of Bank's Commitments and Contingent Liabilities	The following table presents a summary of the Bank’s commitments and contingent liabilities: (in thousands) September 30, December 31, 2017 2016 Financial instruments whose amounts represent risk: Commitments to extend credit: Commercial loans $ 253,673 $ 220,836 Consumer loans 422,521 406,855 Real estate mortgage loans 63,290 42,184 Real estate construction loans 170,416 97,399 Standby letters of credit 12,700 12,763 Deposit account overdraft privilege 96,650 98,583

Stock Options and Other Equit58

Stock Options and Other Equity-Based Incentive Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Option Activity	Stock option activity during the nine months ended September 30, 2017 is summarized in the following table: Number Option Price per Share Weighted Weighted Outstanding at December 31, 2016 592,250 $ 12.63 to $ 23.21 $ 17.12 Options granted — — to — — — Options exercised (133,850 ) $ 14.54 to $ 22.54 $ 18.07 Options forfeited — — to — — Outstanding at September 30, 2017 458,400 $ 12.63 to $ 23.21 $ 16.85
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 September 30, 2017: Currently Currently Not Total Number of options 431,100 27,300 458,400 Weighted average exercise price $ 16.61 $ 20.54 $ 16.85 Intrinsic value (in thousands) $ 10,406 $ 552 $ 10,958 Weighted average remaining contractual term (yrs.) 4.0 6.1 4.1
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 Weighted Outstanding at December 31, 2016 68,450 47,426 RSUs granted 29,669 $ 35.36 17,939 $ 32.95 Additional market plus service condition RSUs vested 6,269 RSUs added through dividend credits 939 — RSUs released (28,397 ) (18,805 ) RSUs forfeited/expired (11 ) — Outstanding at September 30, 2017 70,650 52,829

Noninterest Income and Expense

Noninterest Income and Expense (Tables)	9 Months Ended
	Sep. 30, 2017
Other Income and Expenses [Abstract]
Components of Other Noninterest Income	The components of other noninterest income were as follows (in thousands): Three months ended Nine months ended 2017 2016 2017 2016 Service charges on deposit accounts $ 4,160 $ 3,641 $ 12,102 $ 10,549 ATM and interchange fees 4,209 3,851 12,472 11,136 Other service fees 917 792 2,521 2,369 Mortgage banking service fees 514 537 1,561 1,570 Change in value of mortgage servicing rights (325 ) (799 ) (795 ) (2,198 ) Total service charges and fees 9,475 8,022 27,861 23,426 Gain on sale of loans 606 953 2,293 2,645 Commissions on sale of non-deposit 672 747 1,984 1,890 Increase in cash value of life insurance 732 709 2,043 2,086 Gain on sale of investment securities 961 — 961 — Change in indemnification asset — (10 ) 490 (274 ) Gain on sale of foreclosed assets 37 69 308 218 Sale of customer checks 89 110 287 299 Lease brokerage income 234 172 601 602 Loss on disposal of fixed assets (33 ) (13 ) (61 ) (52 ) Life Insurance death benefit in excess of cash value — — 108 238 Other 157 307 668 1,023 Total other noninterest income 3,455 3,044 9,682 8,675 Total noninterest income $ 12,930 $ 11,066 $ 37,543 $ 32,101 Mortgage loan servicing fees, net of change in fair value of mortgage loan servicing rights $ 189 $ (262 ) $ 766 $ (628 ) Mortgage banking revenue $ 795 $ 691 $ 3,059 $ 2,017
Components of Noninterest Expense	The components of noninterest expense were as follows (in thousands): Three months ended Nine months ended 2017 2016 2017 2016 Base salaries, net of deferred loan origination costs $ 13,600 $ 13,419 $ 40,647 $ 39,095 Incentive compensation 2,609 2,798 6,980 7,008 Benefits and other compensation costs 4,724 4,643 14,693 14,067 Total salaries and benefits expense 20,933 20,860 62,320 60,170 Occupancy 2,799 2,667 8,196 7,504 Equipment 1,816 1,607 5,344 4,837 Data processing and software 2,495 2,068 7,332 6,266 ATM & POS network charges 1,425 1,915 3,353 3,923 Telecommunications 716 702 2,027 2,085 Postage 325 381 1,058 1,186 Courier service 235 280 752 816 Advertising 1,039 1,049 3,173 3,021 Assessments 427 654 1,252 1,864 Operational losses 301 497 1,166 1,006 Professional fees 901 1,018 2,357 3,183 Foreclosed assets expense 41 37 117 197 Provision for foreclosed asset losses 134 8 162 40 Change in reserve for unfunded commitments 390 25 270 433 Intangible amortization 339 359 1,050 1,017 Merger expense — — — 784 Litigation contingent liability — — — 1,450 Other 2,906 3,289 9,019 9,652 Total other noninterest expense 16,289 16,556 46,628 49,264 Total noninterest expense $ 37,222 $ 37,416 $ 108,948 $ 109,434 Merger expense: Base salaries (outside temporary help) — — — $ 187 Equipment — — — 35 Professional fees — — — 342 Advertising and marketing — — — 114 Other — — — 106 Total merger expense — — — $ 784 Average full time equivalent staff 993 1,022 1,005 996 Noninterest expense to revenue (FTE) 64.6 % 69.4 % 64.5 % 69.0 %

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate	The effective tax rate and the statutory federal income tax rate are reconciled for the periods indicated as follows: Three months ended Nine months ended 2017 2016 2017 2016 Federal statutory income tax rate 35.0 % 35.0 % 35.0 % 35.0 % State income taxes, net of federal tax benefit 6.9 6.9 6.8 6.7 Tax-exempt (1.9 ) (1.7 ) (1.8 ) (1.9 ) Increase in cash value of insurance policies (1.3 ) (1.2 ) (1.3 ) (1.6 ) Low income housing tax credits (0.5 ) (0.3 ) (0.4 ) (0.3 ) Equity compensation (0.8 ) — (1.4 ) — Other 0.1 — 0.2 0.1 Effective Tax Rate 37.5 % 38.7 % 37.1 % 38.0 %

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Computation of Earnings Per Share	Earnings per share have been computed based on the following: Three months ended Nine months ended (in thousands) 2017 2016 2017 2016 Net income $ 11,897 $ 12,199 $ 37,565 $ 32,278 Average number of common shares outstanding 22,932 22,825 22,901 22,804 Effect of dilutive stock options and restricted stock units 312 274 338 273 Average number of common shares outstanding used to calculate diluted earnings per share 23,244 23,099 23,239 23,077 Options excluded from diluted earnings per share because the effect of these options was antidilutive — 12 — 18

Comprehensive Income (Tables)

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Components of Accumulated Other Comprehensive Income	The components of accumulated other comprehensive income, included in shareholders’ equity, are as follows: September 30, December 31, (in thousands) Net unrealized loss on available for sale securities $ (3,459 ) $ (8,870 ) Tax effect 1,455 3,729 Unrealized holding loss on available for sale securities, net of tax (2,004 ) (5,141 ) Unfunded status of the supplemental retirement plans (4,431 ) (4,714 ) Tax effect 1,863 1,982 Unfunded status of the supplemental retirement plans, net of tax (2,568 ) (2,732 ) Joint beneficiary agreement liability (40 ) (40 ) Tax effect — — Joint beneficiary agreement liability, net of tax (40 ) (40 ) Accumulated other comprehensive loss $ (4,612 ) $ (7,913 )
Components of Other Comprehensive Income and Related Tax Effects	The components of other comprehensive income and related tax effects are as follows: Three Months Ended Nine Months Ended (in thousands) 2017 2016 2017 2016 Unrealized holding gains (losses) on available for sale securities before reclassifications $ 674 $ (2,058 ) $ 6,372 $ 11,240 Amounts reclassified out of accumulated other comprehensive income (961 ) — (961 ) — Unrealized holding (losses) gains on available for sale securities after reclassifications (287 ) (2,058 ) 5,411 11,240 Tax effect 121 865 (2,274 ) (4,726 ) Unrealized holding (losses) gains on available for sale securities, net of tax (166 ) (1,193 ) 3,137 $ 6,514 Change in unfunded status of the supplemental retirement plans before reclassifications — — — — Amounts reclassified out of accumulated other comprehensive income: Amortization of prior service cost (1 ) (10 ) (5 ) (30 ) Amortization of actuarial losses 96 138 288 413 Total amounts reclassified out of accumulated other comprehensive income 95 128 283 383 Change in unfunded status of the supplemental retirement plans after reclassifications 95 128 283 383 Tax effect (40 ) (54 ) (119 ) (161 ) Change in unfunded status of the supplemental retirement plans, net of tax 55 74 164 222 Change in joint beneficiary agreement liability before reclassifications — (1 ) — (5 ) Amounts reclassified out of accumulated other comprehensive income — — — — Change in joint beneficiary agreement liability after reclassifications — (1 ) — (5 ) Tax effect — — — — Change in joint beneficiary agreement liability, net of tax — (1 ) — (5 ) Total other comprehensive (loss) income $ (111 ) $ (1,120 ) $ 3,301 $ 6,731

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
Summary of 401(k) Contribution Plan	The following table sets forth the benefit expense attributable to the 401(k) Plan matching contributions, and the contributions made by the Company to the 401(k) Plan during the periods indicated: Three months ended September 30, Nine months ended September 30, (in thousands) 2017 2016 2017 2016 401(k) Plan benefits expense $ 164 $ 187 $ 603 $ 515 401(k) Plan contributions made by the Company $ 224 $ 187 $ 595 $ 648
Summary of ESOP Activities	The following table sets forth the benefit expense attributable to the ESOP, and the contributions made by the Company to the ESOP during the periods indicated: Three months ended September 30, Nine months ended September 30, (in thousands) 2017 2016 2017 2016 ESOP benefits expense $ 537 $ 463 $ 1,610 $ 1,368 ESOP contributions made by the Company $ 537 — $ 2,073 $ 905
Schedule of Deferred Compensation Earnings Credits Included in Noninterest Expense	The following table sets forth the earnings credits on deferred balances included in noninterest expense during the periods indicated: Three months ended September 30, Nine months ended September 30, (in thousands) 2017 2016 2017 2016 Deferred compensation earnings credits included in noninterest expense $ 111 $ 111 $ 365 $ 366
Net Periodic Benefit Cost Recognized for Supplemental Retirement Plans	The following table sets forth the net periodic benefit cost recognized for the plans: Three months ended Nine months ended (in thousands) 2017 2016 2017 2016 Net pension cost included the following components: Service cost-benefits earned during the period $ 235 $ 260 $ 706 $ 781 Interest cost on projected benefit obligation 248 256 743 769 Amortization of net obligation at transition — 1 1 1 Amortization of prior service cost (3 ) (10 ) (8 ) (30 ) Recognized net actuarial loss 98 137 292 412 Net periodic pension cost $ 578 $ 644 $ 1,734 $ 1,933 Company contributions to pension plans $ 267 $ 260 $ 856 $ 834 Pension plan payouts to participants $ 267 $ 260 $ 856 $ 834

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2017
Related Party Transactions [Abstract]
Summary of Activity in Lending Transactions	The following table summarizes the activity in these loans for periods indicated (in thousands): Balance December 31, 2015 $ 4,201 Advances/new loans 730 Removed/payments (2,499 ) Balance December 31, 2016 2,432 Advances/new loans 160 Removed/payments (666 ) Balance September 30, 2017 $ 1,926

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2017
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): Fair value at September 30, 2017 Total Level 1 Level 2 Level 3 Securities available for sale: Obligations of U.S. government corporations and agencies $ 554,062 — $ 554,062 — Obligations of states and political subdivisions 121,217 — 121,217 — Marketable equity services 2,957 $ 2,957 — — Mortgage servicing rights 6,419 — — $ 6,419 Total assets measured at fair value $ 684,655 $ 2,957 $ 675,279 $ 6,419 Fair value at December 31, 2016 Total Level 1 Level 2 Level 3 Securities available-for-sale: Obligations of U.S. government corporations and agencies $ 429,678 — $ 429,678 — Obligations of states and political subdivisions 117,617 — 117,617 — Marketable equity securities 2,938 $ 2,938 — — Mortgage servicing rights 6,595 — — $ 6,595 Total assets measured at fair value $ 556,828 $ 2,938 $ 547,295 $ 6,595
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 time periods indicated. Had there been any transfer into or out of Level 3 during the time periods indicated, 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): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Mortgage servicing rights: Balance at beginning of period $ 6,596 $ 6,720 $ 6,595 $ 7,618 Additions 147 287 619 788 Change in fair value (324 ) (799 ) (795 ) (2,198 ) Balance at end of period $ 6,419 $ 6,208 $ 6,419 $ 6,208
Quantitative Information about Recurring Level 3 Fair Value Measurements	The following table presents quantitative information about recurring Level 3 fair value measurements at September 30, 2017: Fair Value Valuation Unobservable Range, Mortgage Servicing Rights $ 6,419 Discounted cash flow Constant prepayment rate 6.5%-21.4%, 9.2% Discount rate 14.0%-16.0%, 14.0% The following table presents quantitative information about recurring Level 3 fair value measurements at December 31, 2016: Fair Value Valuation Unobservable Range, Mortgage Servicing Rights $ 6,595 Discounted cash flow Constant prepayment rate 6.9%-16.6%, 8.8% Discount rate 14.0%-16.0%, 14.0%
Assets and Liabilities Measured at Fair Value on Nonrecurring Basis	The tables below present the recorded investment in assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated (in thousands): Nine months ended September 30, 2017 Total Level 1 Level 2 Level 3 Total Gains (Losses) Fair value: Impaired Originated & PNCI loans $ 1,026 — — $ 1,026 $ (892 ) Foreclosed assets 2,062 — — 2,062 (157 ) Total assets measured at fair value $ 3,088 — — $ 3,088 $ (1,049 ) Year ended December 31, 2016 Total Level 1 Level 2 Level 3 Total Gains Fair value: Impaired Originated & PNCI loans $ 1,107 — — $ 1,107 $ (409 ) Foreclosed assets 2,253 2,253 (86 ) Total assets measured at fair value $ 3,360 — — $ 3,360 $ (495 ) Nine months ended September 30, 2016 Total Level 1 Level 2 Level 3 Total Fair value: Impaired Originated & PNCI loans $ 5,941 — — $ 5,941 $ (570 ) Foreclosed assets 1,801 — — 1,801 14 Total assets measured at fair value $ 7,742 — — $ 7,742 $ (556 )
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 September 30, 2017: Fair Value Valuation Unobservable Inputs Range, Weighted Impaired Originated & PNCI loans $ 1,026 Sales comparison Adjustment for differences between comparable sales Capitalization rate (74)%-21%, (32%) Foreclosed assets (Land & construction) $ 960 Sales comparison Adjustment for differences between comparable sales (53)%-283%, Foreclosed assets (residential $ 822 Sales comparison Adjustment for differences between comparable sales (47%)-39%, Foreclosed assets $ 280 Sales comparison Adjustment for differences between comparable sales (46%)-63%, 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, 2016: Fair Value Valuation Unobservable Inputs Range, Impaired Originated & PNCI loans $ 1,107 Sales comparison Adjustment for differences between comparable sales Capitalization rate Not meaningful N/A Foreclosed assets $ 15 Sales comparison Adjustment for differences between comparable sales Not meaningful Foreclosed assets $ 1,564 Sales comparison Adjustment for differences between comparable sales Not meaningful Foreclosed assets $ 674 Sales comparison Adjustment for differences between comparable sales Not meaningful
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): September 30, 2017 December 31, 2016 Carrying Fair Carrying Fair Financial assets: Level 1 inputs: Cash and due from banks $ 86,815 $ 86,815 $ 92,197 $ 92,197 Cash at Federal Reserve and other banks 101,219 101,219 213,415 213,415 Level 2 inputs: Securities held to maturity 536,567 542,123 602,536 603,203 Restricted equity securities 16,956 N/A 16,956 N/A Loans held for sale 2,733 2,733 2,998 2,998 Level 3 inputs: Loans, net 2,902,866 2,928,059 2,727,090 2,763,473 Financial liabilities: Level 2 inputs: Deposits 3,927,456 3,925,527 3,895,560 3,893,941 Other borrowings 98,730 98,730 17,493 17,493 Level 3 inputs: Junior subordinated debt $ 56,810 $ 55,259 $ 56,667 $ 49,033 Contract Fair Contract Fair Off-balance Level 3 inputs: Commitments $ 909,900 $ 9,099 $ 767,274 $ 7,673 Standby letters of credit $ 12,700 $ 128 $ 12,763 $ 128 Overdraft privilege commitments $ 96,650 $ 967 $ 98,583 $ 986

TriCo Bancshares Condensed Fi66

TriCo Bancshares Condensed Financial Statements (Parent Only) (Tables)	9 Months Ended
	Sep. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	Condensed Balance Sheets September 30, December 31, (In thousands) Assets Cash and Cash equivalents $ 3,278 $ 2,802 Investment in Tri Counties Bank 558,986 529,907 Other assets 1,729 1,711 Total assets $ 563,993 $ 534,420 Liabilities and shareholders’ equity Other liabilities $ 450 $ 406 Junior subordinated debt 56,810 56,667 Total liabilities 57,260 57,073 Shareholders’ equity: Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 22,941,464 and 22,867,802 shares, respectively 255,231 252,820 Retained earnings 256,114 232,440 Accumulated other comprehensive loss, net (4,612 ) (7,913 ) Total shareholders’ equity 506,733 477,347 Total liabilities and shareholders’ equity $ 563,993 $ 534,420
Statements of Income	Statements of Income Three months ended Nine months ended (In thousands) 2017 2016 2017 2016 Interest expense $ 652 $ 562 $ 1,870 $ 1,643 Administration expense 209 158 586 548 Loss before equity in net income of Tri Counties Bank (861 ) (720 ) (2,456 ) (2,191 ) Equity in net income of Tri Counties Bank: Distributed 5,185 4,096 14,394 11,434 (Over) under distributed 7,211 8,522 24,594 22,116 Income tax benefit 362 301 1,033 919 Net income $ 11,897 $ 12,199 $ 37,565 $ 32,278
Statements of Comprehensive Income	Statements of Comprehensive Income Three months ended Nine months ended (In thousands) 2017 2016 2017 2016 Net income $ 11,897 $ 12,199 $ 37,565 $ 32,278 Other comprehensive income (loss), net of tax: Unrealized holding (losses) gains on available for sale securities arising during the period (166 ) (1,193 ) 3,137 6,514 Change in minimum pension liability 55 74 164 222 Change in joint beneficiary liability — (1 ) — (5 ) Other comprehensive (loss) income (111 ) (1,120 ) 3,301 6,731 Comprehensive income $ 11,786 $ 11,079 $ 40,866 $ 39,009
Statements of Cash Flows	Statements of Cash Flows Nine months ended (In thousands) 2017 2016 Operating activities: Net income $ 37,565 $ 32,278 Adjustments to reconcile net income to net cash provided by operating activities: Over (under) distributed equity in earnings of Tri Counties Bank (24,594 ) (22,116 ) Equity compensation vesting expense 1,184 1,078 Equity compensation net (excess tax benefit) tax expense — 182 Net change in other assets and liabilities (1,015 ) (906 ) Net cash provided by operating activities 13,140 10,516 Investing activities: None Financing activities: Issuance of common stock through option exercise 193 518 Equity compensation net (excess tax benefit) tax expense — (182 ) Repurchase of common stock (1,629 ) (384 ) Cash dividends paid — common (11,228 ) (10,265 ) Net cash used for financing activities (12,664 ) (10,313 ) Increase in cash and cash equivalents 476 203 Cash and cash equivalents at beginning of year 2,802 2,565 Cash and cash equivalents at end of year $ 3,278 $ 2,768

Regulatory Matters (Tables)

Regulatory Matters (Tables)	9 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
Actual and Required Capital Ratios of Bank	The following tables present actual and required capital ratios as of September 30, 2017 and December 31, 2016 for the Company and the Bank under Basel III Capital Rules. The minimum capital amounts presented include the minimum required capital levels as of September 30, 2017 (1.25%) and December 31, 2016 (0.625%) based on the then phased-in phased-in. Minimum Capital Minimum Capital Required to be Required – Basel III Required – Basel III Considered Well Actual Phase-in Fully Phased In Capitalized Amount Ratio Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of September 30, 2017: Total Capital (to Risk Weighted Assets): Consolidated $ 525,569 14.42 % $ 337,117 9.250 % $ 382,673 10.50 % N/A N/A Tri Counties Bank $ 522,718 14.35 % $ 336,957 9.250 % $ 382,492 10.50 % $ 364,278 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 493,833 13.55 % $ 264,227 7.250 % $ 309,783 8.50 % N/A N/A Tri Counties Bank $ 490,982 13.48 % $ 264,102 7.250 % $ 309,636 8.50 % $ 291,422 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 439,498 12.06 % $ 209,559 5.750 % $ 255,116 7.00 % N/A N/A Tri Counties Bank $ 490,982 13.48 % $ 209,460 5.750 % $ 254,995 7.00 % $ 236,781 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 493,833 10.98 % $ 179,925 4.000 % $ 179,925 4.00 % N/A N/A Tri Counties Bank $ 490,982 10.92 % $ 179,920 4.000 % $ 179,920 4.00 % $ 224,900 5.00 % Minimum Capital Minimum Capital Required to be Required – Basel III Required – Basel III Considered Well Actual Phase-in Fully Phased In Capitalized Amount Ratio Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of December 31, 2016: Total Capital (to Risk Weighted Assets): Consolidated $ 503,283 14.77 % $ 293,854 8.625 % $ 357,735 10.50 % N/A N/A Tri Counties Bank $ 500,876 14.71 % $ 293,706 8.625 % $ 357,556 10.50 % $ 340,529 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 468,061 13.74 % $ 225,714 6.625 % $ 289,595 8.50 % N/A N/A Tri Counties Bank $ 465,654 13.67 % $ 225,601 6.625 % $ 289,450 8.50 % $ 274,725 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 414,632 12.17 % $ 174,609 5.125 % $ 238,490 7.00 % N/A N/A Tri Counties Bank $ 465,654 13.66 % $ 174,521 5.125 % $ 238,370 7.00 % $ 221,344 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 468,061 10.62 % $ 176,346 4.000 % $ 176,346 4.00 % N/A N/A Tri Counties Bank $ 465,654 10.56 % $ 176,341 4.000 % $ 176,341 4.00 % $ 220,426 5.00 %

Summary of Quarterly Results 68

Summary of Quarterly Results of Operations (unaudited) (Tables)	9 Months Ended
	Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Results of Operations	The following table sets forth the results of operations for the periods indicated, 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. 2017 Quarters Ended September 30, June 30, March 31, (dollars in thousands, except per share data) Interest and dividend income: Loans: Discount accretion PCI – cash basis 398 $ 386 $ 112 Discount accretion PCI – other 407 797 631 Discount accretion PNCI 559 987 798 All other loan interest income 35,904 34,248 33,373 Total loan interest income 37,268 36,418 34,914 Debt securities, dividends and interest bearing cash at Banks (not FTE) 8,645 8,626 8,570 Total interest income 45,913 45,044 43,484 Interest expense 1,829 1,610 1,491 Net interest income 44,084 43,434 41,993 Provision for (benefit from reversal of provision for) loan losses 765 (796 ) (1,557 ) Net interest income after provision for loan losses 43,319 44,230 43,550 Noninterest income 12,930 12,910 11,703 Noninterest expense 37,222 35,904 35,822 Income before income taxes 19,027 21,236 19,431 Income tax expense 7,130 7,647 7,352 Net income $ 11,897 $ 13,589 $ 12,079 Per common share: Net income (diluted) $ 0.51 $ 0.58 $ 0.52 Dividends $ 0.17 $ 0.17 $ 0.15 2016 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 $ 483 $ 777 $ 426 $ 269 Discount accretion PCI – other 658 569 415 (45 ) Discount accretion PNCI 637 883 1,459 868 All other loan interest income 34,463 33,540 32,038 33,646 Total loan interest income 36,241 35,769 34,338 34,738 Debt securities, dividends and interest bearing cash at Banks (not FTE) 8,374 7,940 8,252 8,056 Total interest income 44,615 43,709 42,590 42,794 Interest expense 1,460 1,439 1,430 1,392 Net interest income 43,155 42,270 41,160 41,402 (Benefit from reversal of) provision for loan losses (1,433 ) (3,973 ) (773 ) 209 Net interest income after provision for loan losses 44,588 46,243 41,933 41,193 Noninterest income 12,462 11,066 11,245 9,790 Noninterest expense 36,563 37,416 38,267 33,751 Income before income taxes 20,487 19,893 14,911 17,232 Income tax expense 7,954 7,694 5,506 6,558 Net income $ 12,533 $ 12,199 $ 9,405 $ 10,674 Per common share: Net income (diluted) $ 0.54 $ 0.53 $ 0.41 $ 0.46 Dividends $ 0.15 $ 0.15 $ 0.15 $ 0.15

Summary of Significant Accoun69

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2017USD ($)BranchesSegmentLocationTrustBusiness	Dec. 31, 2016USD ($)	Jun. 30, 2017USD ($)
Significant Of Accounting Policies [Line Items]
Number of subsidiary business trusts | Trust		5
Company's investments in the trusts	$ 1,706,000	$ 1,706,000
Number of business segment | Segment		1
Trading securities			$ 0	$ 0
Sale of classified investment securities	24,796,000
Proceeds from sale of investment securities	25,757,000
Gain from sale of classified investment securities	961,000	$ 961,000
Recognized OTTI losses		$ 0	$ 0
Loans contractual past due		90 days
TDR loans payment period in nonaccrual status		6 months
Tri Counties Bank [Member]
Significant Of Accounting Policies [Line Items]
Number of locations acquired | Location		3
Number of traditional operating branches | Branches		57
Number of in-store operating branches | Branches		9
California [Member]
Significant Of Accounting Policies [Line Items]
Number of counties | Business		26
ASU 2016-09 [Member]
Significant Of Accounting Policies [Line Items]
Recognition of excess tax benefits	150,000	$ 847,000
Reclassifications [Member] | Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]
Significant Of Accounting Policies [Line Items]
Loans	60,957,000	60,957,000
Reclassifications [Member] | Consumer [Member] | Home Equity Loans [Member]
Significant Of Accounting Policies [Line Items]
Loans	$ 5,620,000	$ 5,620,000
Minimum [Member] | Parent [Member] | Reclassifications [Member]
Significant Of Accounting Policies [Line Items]
Total risk based capital ratios, increase percentage	0.10%
Tier 1 capital ratios, increase percentage	0.10%
Tier 1 common equity ratios, increase percentage	0.10%
Minimum [Member] | Tri Countries Bank [Member] | Reclassifications [Member]
Significant Of Accounting Policies [Line Items]
Total risk based capital ratios, increase percentage	0.10%
Tier 1 capital ratios, increase percentage	0.10%
Tier 1 common equity ratios, increase percentage	0.10%
Maximum [Member] | Parent [Member] | Reclassifications [Member]
Significant Of Accounting Policies [Line Items]
Total risk based capital ratios, increase percentage	0.20%
Tier 1 capital ratios, increase percentage	0.20%
Tier 1 common equity ratios, increase percentage	0.20%
Maximum [Member] | Tri Countries Bank [Member] | Reclassifications [Member]
Significant Of Accounting Policies [Line Items]
Total risk based capital ratios, increase percentage	0.20%
Tier 1 capital ratios, increase percentage	0.20%
Tier 1 common equity ratios, increase percentage	0.20%
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)	Mar. 18, 2016USD ($)Branches	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Goodwill recognized		$ 64,311,000	$ 64,311,000
Bank of America [Member]
Business Acquisition [Line Items]
Number of branches | Branches	3
Acquisition, completion date	Oct. 28, 2015
Cash consideration	$ 3,204,000
Deposits	161,231,000
Loans	289,000
Goodwill recognized	849,000
Increase in net book value of land and buildings acquired	309,000
Recognized intangible related to acquisition	2,046,000
Bank of America [Member] | Core Deposit Intangibles [Member]
Business Acquisition [Line Items]
Recognized intangible related to acquisition	$ 2,046,000
Percentage of acquired intangibles	1.50%
Finite lived intangible asset estimated 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 ($) $ in Thousands	Mar. 18, 2016	Sep. 30, 2017	Dec. 31, 2016
Liabilities assumed:
Goodwill recognized		$ 64,311	$ 64,311
Bank of America [Member]
Fair value of consideration transferred:
Cash consideration	$ 3,204
Total fair value of consideration transferred	3,204
Asset acquired:
Cash and cash equivalents	159,520
Loans	289
Premises and equipment	1,590
Core deposit intangible	2,046
Other assets	141
Total assets acquired	163,586
Liabilities assumed:
Deposits	161,231
Total liabilities assumed	161,231
Total net assets acquired	2,355
Goodwill recognized	$ 849

Business Combinations - Summary

Business Combinations - Summary of Cash Paid and Estimated Fair Value Adjustments Resulting in Goodwill (Detail) - USD ($) $ in Thousands	Mar. 18, 2016	Sep. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 64,311	$ 64,311
Bank of America [Member]
Business Acquisition [Line Items]
Cash paid	$ 3,204
Cost basis net assets acquired	0
Fair Value Adjustments, Premises and Equipment	(309)
Core deposit intangible	(2,046)
Goodwill	849
Bank of America [Member] | Loans [Member]
Business Acquisition [Line Items]
Fair Value Adjustments	$ 0

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Values of Investments in Debt and Equity Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 681,695	$ 559,103
Gross Unrealized Gains	2,503	2,216
Gross Unrealized Losses	(5,962)	(11,086)
Estimated Fair Value	678,236	550,233
Amortized Cost, Held to Maturity	536,567	602,536
Gross Unrealized Gains, Held to Maturity	7,048	5,057
Gross Unrealized Losses, Held to Maturity	(1,492)	(4,390)
Estimated Fair Value, Held to Maturity	542,123	603,203
Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	557,060	434,357
Gross Unrealized Gains	1,321	1,949
Gross Unrealized Losses	(4,319)	(6,628)
Estimated Fair Value	554,062	429,678
Amortized Cost, Held to Maturity	521,999	587,982
Gross Unrealized Gains, Held to Maturity	6,837	5,001
Gross Unrealized Losses, Held to Maturity	(1,442)	(4,199)
Estimated Fair Value, Held to Maturity	527,394	588,784
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	121,635	121,746
Gross Unrealized Gains	1,182	267
Gross Unrealized Losses	(1,600)	(4,396)
Estimated Fair Value	121,217	117,617
Amortized Cost, Held to Maturity	14,568	14,554
Gross Unrealized Gains, Held to Maturity	211	56
Gross Unrealized Losses, Held to Maturity	(50)	(191)
Estimated Fair Value, Held to Maturity	14,729	14,419
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,000	3,000
Gross Unrealized Losses	(43)	(62)
Estimated Fair Value	$ 2,957	$ 2,938

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2017USD ($)Investmentsecurities	Jun. 30, 2017USD ($)	Sep. 30, 2017USD ($)Investmentsecurities	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Investment Securities [Line Items]
Investment securities sold		$ 0		$ 0
Investment securities carrying value	$ 268,076,000		$ 268,076,000		$ 292,737,000
Investment securities cost basis	25,757,000
Residential real estate mortgage-backed securities	$ 1,079,060,000		$ 1,079,060,000
Life of mortgage-backed securities			5 years 7 months 6 days
Obligations of U.S. Government Corporations and Agencies [Member]
Investment Securities [Line Items]
Debt securities | Investmentsecurities	51		51
Percentage of aggregate depreciation in unrealized losses	1.14%		1.14%
Obligations of States and Political Subdivisions [Member]
Investment Securities [Line Items]
Debt securities | Investmentsecurities	48		48
Percentage of aggregate depreciation in unrealized losses	3.61%		3.61%
Marketable Equity Securities [Member]
Investment Securities [Line Items]
Debt securities | Investmentsecurities	2		2
Percentage of aggregate depreciation in unrealized losses	1.43%		1.43%

Investment Securities - Amort75

Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Due in one year, Amortized Cost	$ 2
Due after one year through five years, Amortized Cost	206
Due after five years through ten years, Amortized Cost	2,223
Due after ten years, Amortized Cost	679,264
Totals, Amortized Cost	681,695
Due in one year, Estimated Fair Value	2
Due after one year through five years, Estimated Fair Value	206
Due after five years through ten years, Estimated Fair Value	2,279
Due after ten years, Estimated Fair Value	675,749
Totals, Estimated Fair Value	678,236
Due in one year, Amortized Cost, Held to Maturity	0
Due after one year through five years, Amortized Cost, Held to Maturity	1,199
Due after five years through ten years, Amortized Cost, Held to Maturity	4,098
Due after ten years, Amortized Cost, Held to Maturity	531,270
Totals, Amortized Cost, Held to Maturity	536,567	$ 602,536
Due in one year, Estimated Fair Value, Held to Maturity	0
Due after one year through five years, Estimated Fair Value, Held to Maturity	1,233
Due after five years through ten years, Estimated Fair Value, Held to Maturity	4,165
Due after ten years, Estimated Fair Value, Held to Maturity	536,725
Estimated Fair Value, Held to Maturity	$ 542,123	$ 603,203

Investment Securities - Gross U

Investment Securities - Gross Unrealized Losses on Investment (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 400,146	$ 464,152
Less than 12 months, Unrealized Loss	(5,265)	(11,086)
12 months or more, Fair Value	8,905
12 months or more, Unrealized Loss	(697)
Total Fair Value	409,051	464,152
Total Unrealized Loss	(5,962)	(11,086)
Less than 12 months, Fair Value, held to maturity	136,650	290,481
Less than 12 months, Unrealized Loss, held to maturity	(1,492)	(4,390)
12 months or more, Fair Value, held to maturity	0	0
12 months or more, Unrealized Loss, held to maturity	0	0
Total Fair Value, held to maturity	136,650	290,481
Total Unrealized Loss, held to maturity	(1,492)	(4,390)
Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	365,252	370,389
Less than 12 months, Unrealized Loss	(4,319)	(6,628)
Total Fair Value	365,252	370,389
Total Unrealized Loss	(4,319)	(6,628)
Less than 12 months, Fair Value, held to maturity	133,453	280,497
Less than 12 months, Unrealized Loss, held to maturity	(1,442)	(4,199)
12 months or more, Fair Value, held to maturity	0	0
12 months or more, Unrealized Loss, held to maturity	0	0
Total Fair Value, held to maturity	133,453	280,497
Total Unrealized Loss, held to maturity	(1,442)	(4,199)
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	31,937	90,825
Less than 12 months, Unrealized Loss	(903)	(4,396)
12 months or more, Fair Value	8,905
12 months or more, Unrealized Loss	(697)
Total Fair Value	40,842	90,825
Total Unrealized Loss	(1,600)	(4,396)
Less than 12 months, Fair Value, held to maturity	3,197	9,984
Less than 12 months, Unrealized Loss, held to maturity	(50)	(191)
12 months or more, Fair Value, held to maturity	0	0
12 months or more, Unrealized Loss, held to maturity	0	0
Total Fair Value, held to maturity	3,179	9,984
Total Unrealized Loss, held to maturity	(50)	(191)
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	2,957	2,938
Less than 12 months, Unrealized Loss	(43)	(62)
Total Fair Value	2,957	2,938
Total Unrealized Loss	$ (43)	$ (62)

Loans - Summary of Loan Balance

Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	$ 2,931,613		$ 2,759,593	$ 2,712,226
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	2,931,613		2,759,593	2,712,226
Construction:
Total loans, net of unamortized deferred loan fees and discounts	2,931,613		2,759,593	2,712,226
Commercial	2,955,323		2,785,312
Unamortized net deferred loan fees	(7,982)		(6,916)
Discounts to principal balance of loans owed, net of charge-offs	(15,728)		(18,803)
Total loans, net of unamortized deferred loan fees and discounts	2,931,613		2,759,593	2,712,226
Noncovered loans	2,931,613		2,756,417
Covered loans			3,176
Total loans, net of unamortized deferred loan fees and discounts	2,931,613		2,759,593	2,712,226
Allowance for loan losses	(28,747)	$ (28,143)	(32,503)	(33,484)	$ (35,509)	$ (36,011)
Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	2,194,874		2,053,464
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	2,194,874		2,053,464
Construction:
Total loans, net of unamortized deferred loan fees and discounts	2,194,874		2,053,464
Total loans, net of unamortized deferred loan fees and discounts	2,194,874		2,053,464
Total loans, net of unamortized deferred loan fees and discounts	2,194,874		2,053,464
Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	361,320		366,663
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	361,320		366,663
Construction:
Total loans, net of unamortized deferred loan fees and discounts	361,320		366,663
Total loans, net of unamortized deferred loan fees and discounts	361,320		366,663
Total loans, net of unamortized deferred loan fees and discounts	361,320		366,663
Commercial Portfolio Segment [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	227,479		217,047
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	227,479		217,047
Construction:
Total loans, net of unamortized deferred loan fees and discounts	227,479		217,047
Total loans, net of unamortized deferred loan fees and discounts	227,479		217,047
Total loans, net of unamortized deferred loan fees and discounts	227,479		217,047
Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	147,940		122,419
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	147,940		122,419
Construction:
Total loans, net of unamortized deferred loan fees and discounts	147,940		122,419
Total loans, net of unamortized deferred loan fees and discounts	147,940		122,419
Total loans, net of unamortized deferred loan fees and discounts	147,940		122,419
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	391,072		368,343
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	391,072		368,343
Construction:
Total loans, net of unamortized deferred loan fees and discounts	391,072		368,343
Total loans, net of unamortized deferred loan fees and discounts	391,072		368,343
Total loans, net of unamortized deferred loan fees and discounts	391,072		368,343
Home Equity Loans [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	45,033		46,182	48,314
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	45,033		46,182	48,314
Construction:
Total loans, net of unamortized deferred loan fees and discounts	45,033		46,182	48,314
Total loans, net of unamortized deferred loan fees and discounts	45,033		46,182	48,314
Total loans, net of unamortized deferred loan fees and discounts	45,033		46,182	48,314
Allowance for loan losses	(1,991)	(2,354)	(2,645)	(3,101)	(3,057)	(3,177)
Other Consumer [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	26,781		30,766	31,611
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	26,781		30,766	31,611
Construction:
Total loans, net of unamortized deferred loan fees and discounts	26,781		30,766	31,611
Total loans, net of unamortized deferred loan fees and discounts	26,781		30,766	31,611
Total loans, net of unamortized deferred loan fees and discounts	26,781		30,766	31,611
Allowance for loan losses	(590)	(645)	(622)	(667)	(696)	(688)
Commercial [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	1,803,802		1,685,121	1,625,897
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	1,803,802		1,685,121	1,625,897
Construction:
Total loans, net of unamortized deferred loan fees and discounts	1,803,802		1,685,121	1,625,897
Total loans, net of unamortized deferred loan fees and discounts	1,803,802		1,685,121	1,625,897
Total loans, net of unamortized deferred loan fees and discounts	1,803,802		1,685,121	1,625,897
Allowance for loan losses	(11,370)	(10,119)	(11,503)	(11,576)	(11,934)	(11,015)
Commercial [Member] | Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	72,820		66,990	61,295
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	72,820		66,990	61,295
Construction:
Total loans, net of unamortized deferred loan fees and discounts	72,820		66,990	61,295
Total loans, net of unamortized deferred loan fees and discounts	72,820		66,990	61,295
Total loans, net of unamortized deferred loan fees and discounts	72,820		66,990	61,295
Allowance for loan losses	(625)	(466)	(680)	(424)	(952)	(812)
Home Equity Lines of Credit [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	289,506		289,715	301,884
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	289,506		289,715	301,884
Construction:
Total loans, net of unamortized deferred loan fees and discounts	289,506		289,715	301,884
Total loans, net of unamortized deferred loan fees and discounts	289,506		289,715	301,884
Total loans, net of unamortized deferred loan fees and discounts	289,506		289,715	301,884
Allowance for loan losses	(5,721)	(6,156)	(7,045)	(8,400)	(9,203)	(11,253)
Residential [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	391,072		368,343	368,223
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	391,072		368,343	368,223
Construction:
Total loans, net of unamortized deferred loan fees and discounts	391,072		368,343	368,223
Total loans, net of unamortized deferred loan fees and discounts	391,072		368,343	368,223
Total loans, net of unamortized deferred loan fees and discounts	391,072		368,343	368,223
Allowance for loan losses	(2,218)	(2,495)	(2,761)	(2,769)	(3,081)	(2,896)
Residential [Member] | Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	75,120		55,429	57,892
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	75,120		55,429	57,892
Construction:
Total loans, net of unamortized deferred loan fees and discounts	75,120		55,429	57,892
Total loans, net of unamortized deferred loan fees and discounts	75,120		55,429	57,892
Total loans, net of unamortized deferred loan fees and discounts	75,120		55,429	57,892
Allowance for loan losses	(1,430)	$ (1,179)	(1,416)	$ (1,305)	$ (1,321)	$ (899)
Originated [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	2,606,539		2,356,327
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	2,606,539		2,356,327
Construction:
Total loans, net of unamortized deferred loan fees and discounts	2,606,539		2,356,327
Commercial	2,614,521		2,363,243
Unamortized net deferred loan fees	(7,982)		(6,916)
Total loans, net of unamortized deferred loan fees and discounts	2,606,539		2,356,327
Noncovered loans	2,606,539		2,356,327
Total loans, net of unamortized deferred loan fees and discounts	2,606,539		2,356,327
Allowance for loan losses	(27,417)		(28,141)
Originated [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	1,910,642		1,710,367
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	1,910,642		1,710,367
Construction:
Total loans, net of unamortized deferred loan fees and discounts	1,910,642		1,710,367
Total loans, net of unamortized deferred loan fees and discounts	1,910,642		1,710,367
Total loans, net of unamortized deferred loan fees and discounts	1,910,642		1,710,367
Originated [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	335,391		332,493
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	335,391		332,493
Construction:
Total loans, net of unamortized deferred loan fees and discounts	335,391		332,493
Total loans, net of unamortized deferred loan fees and discounts	335,391		332,493
Total loans, net of unamortized deferred loan fees and discounts	335,391		332,493
Originated [Member] | Commercial Portfolio Segment [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	215,946		200,735
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	215,946		200,735
Construction:
Total loans, net of unamortized deferred loan fees and discounts	215,946		200,735
Total loans, net of unamortized deferred loan fees and discounts	215,946		200,735
Total loans, net of unamortized deferred loan fees and discounts	215,946		200,735
Originated [Member] | Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	144,560		112,732
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	144,560		112,732
Construction:
Total loans, net of unamortized deferred loan fees and discounts	144,560		112,732
Total loans, net of unamortized deferred loan fees and discounts	144,560		112,732
Total loans, net of unamortized deferred loan fees and discounts	144,560		112,732
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	321,852		284,539
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	321,852		284,539
Construction:
Total loans, net of unamortized deferred loan fees and discounts	321,852		284,539
Total loans, net of unamortized deferred loan fees and discounts	321,852		284,539
Total loans, net of unamortized deferred loan fees and discounts	321,852		284,539
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	41,486		40,736
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	41,486		40,736
Construction:
Total loans, net of unamortized deferred loan fees and discounts	41,486		40,736
Total loans, net of unamortized deferred loan fees and discounts	41,486		40,736
Total loans, net of unamortized deferred loan fees and discounts	41,486		40,736
Originated [Member] | Other Consumer [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	24,435		28,167
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	24,435		28,167
Construction:
Total loans, net of unamortized deferred loan fees and discounts	24,435		28,167
Total loans, net of unamortized deferred loan fees and discounts	24,435		28,167
Total loans, net of unamortized deferred loan fees and discounts	24,435		28,167
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	1,588,790		1,425,828
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	1,588,790		1,425,828
Construction:
Total loans, net of unamortized deferred loan fees and discounts	1,588,790		1,425,828
Total loans, net of unamortized deferred loan fees and discounts	1,588,790		1,425,828
Total loans, net of unamortized deferred loan fees and discounts	1,588,790		1,425,828
Originated [Member] | Commercial [Member] | Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	69,452		58,119
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	69,452		58,119
Construction:
Total loans, net of unamortized deferred loan fees and discounts	69,452		58,119
Total loans, net of unamortized deferred loan fees and discounts	69,452		58,119
Total loans, net of unamortized deferred loan fees and discounts	69,452		58,119
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	269,470		263,590
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	269,470		263,590
Construction:
Total loans, net of unamortized deferred loan fees and discounts	269,470		263,590
Total loans, net of unamortized deferred loan fees and discounts	269,470		263,590
Total loans, net of unamortized deferred loan fees and discounts	269,470		263,590
Originated [Member] | Residential [Member] | Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	75,108		54,613
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	75,108		54,613
Construction:
Total loans, net of unamortized deferred loan fees and discounts	75,108		54,613
Total loans, net of unamortized deferred loan fees and discounts	75,108		54,613
Total loans, net of unamortized deferred loan fees and discounts	75,108		54,613
PNCI [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	309,070		378,222
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	309,070		378,222
Construction:
Total loans, net of unamortized deferred loan fees and discounts	309,070		378,222
Commercial	316,657		388,139
Discounts to principal balance of loans owed, net of charge-offs	(7,587)		(9,917)
Total loans, net of unamortized deferred loan fees and discounts	309,070		378,222
Noncovered loans	309,070		378,222
Total loans, net of unamortized deferred loan fees and discounts	309,070		378,222
Allowance for loan losses	(1,043)		(1,665)
PNCI [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	274,656		328,826
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	274,656		328,826
Construction:
Total loans, net of unamortized deferred loan fees and discounts	274,656		328,826
Total loans, net of unamortized deferred loan fees and discounts	274,656		328,826
Total loans, net of unamortized deferred loan fees and discounts	274,656		328,826
PNCI [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	22,196		28,063
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	22,196		28,063
Construction:
Total loans, net of unamortized deferred loan fees and discounts	22,196		28,063
Total loans, net of unamortized deferred loan fees and discounts	22,196		28,063
Total loans, net of unamortized deferred loan fees and discounts	22,196		28,063
PNCI [Member] | Commercial Portfolio Segment [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	8,838		12,321
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	8,838		12,321
Construction:
Total loans, net of unamortized deferred loan fees and discounts	8,838		12,321
Total loans, net of unamortized deferred loan fees and discounts	8,838		12,321
Total loans, net of unamortized deferred loan fees and discounts	8,838		12,321
PNCI [Member] | Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	3,380		9,012
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	3,380		9,012
Construction:
Total loans, net of unamortized deferred loan fees and discounts	3,380		9,012
Total loans, net of unamortized deferred loan fees and discounts	3,380		9,012
Total loans, net of unamortized deferred loan fees and discounts	3,380		9,012
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	67,815		82,335
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	67,815		82,335
Construction:
Total loans, net of unamortized deferred loan fees and discounts	67,815		82,335
Total loans, net of unamortized deferred loan fees and discounts	67,815		82,335
Total loans, net of unamortized deferred loan fees and discounts	67,815		82,335
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	2,810		3,764
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	2,810		3,764
Construction:
Total loans, net of unamortized deferred loan fees and discounts	2,810		3,764
Total loans, net of unamortized deferred loan fees and discounts	2,810		3,764
Total loans, net of unamortized deferred loan fees and discounts	2,810		3,764
PNCI [Member] | Other Consumer [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	2,302		2,534
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	2,302		2,534
Construction:
Total loans, net of unamortized deferred loan fees and discounts	2,302		2,534
Total loans, net of unamortized deferred loan fees and discounts	2,302		2,534
Total loans, net of unamortized deferred loan fees and discounts	2,302		2,534
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	206,841		246,491
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	206,841		246,491
Construction:
Total loans, net of unamortized deferred loan fees and discounts	206,841		246,491
Total loans, net of unamortized deferred loan fees and discounts	206,841		246,491
Total loans, net of unamortized deferred loan fees and discounts	206,841		246,491
PNCI [Member] | Commercial [Member] | Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	3,368		8,871
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	3,368		8,871
Construction:
Total loans, net of unamortized deferred loan fees and discounts	3,368		8,871
Total loans, net of unamortized deferred loan fees and discounts	3,368		8,871
Total loans, net of unamortized deferred loan fees and discounts	3,368		8,871
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	17,084		21,765
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	17,084		21,765
Construction:
Total loans, net of unamortized deferred loan fees and discounts	17,084		21,765
Total loans, net of unamortized deferred loan fees and discounts	17,084		21,765
Total loans, net of unamortized deferred loan fees and discounts	17,084		21,765
PNCI [Member] | Residential [Member] | Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	12		141
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	12		141
Construction:
Total loans, net of unamortized deferred loan fees and discounts	12		141
Total loans, net of unamortized deferred loan fees and discounts	12		141
Total loans, net of unamortized deferred loan fees and discounts	12		141
PCI - Cash Basis [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Construction:
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Commercial	6,519		8,280
Discounts to principal balance of loans owed, net of charge-offs	(4,310)		(5,297)
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Noncovered loans	2,209		2,983
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Allowance for loan losses	(12)		(17)
PCI - Cash Basis [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Construction:
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
PCI - Cash Basis [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Construction:
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
Total loans, net of unamortized deferred loan fees and discounts	2,209		2,983
PCI - Other [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	13,795		22,061
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	13,795		22,061
Construction:
Total loans, net of unamortized deferred loan fees and discounts	13,795		22,061
Commercial	17,626		25,650
Discounts to principal balance of loans owed, net of charge-offs	(3,831)		(3,589)
Total loans, net of unamortized deferred loan fees and discounts	13,795		22,061
Noncovered loans	13,795		18,885
Covered loans			3,176
Total loans, net of unamortized deferred loan fees and discounts	13,795		22,061
Allowance for loan losses	(275)		(2,680)
PCI - Other [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	9,576		14,271
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	9,576		14,271
Construction:
Total loans, net of unamortized deferred loan fees and discounts	9,576		14,271
Total loans, net of unamortized deferred loan fees and discounts	9,576		14,271
Total loans, net of unamortized deferred loan fees and discounts	9,576		14,271
PCI - Other [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	1,524		3,124
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	1,524		3,124
Construction:
Total loans, net of unamortized deferred loan fees and discounts	1,524		3,124
Total loans, net of unamortized deferred loan fees and discounts	1,524		3,124
Total loans, net of unamortized deferred loan fees and discounts	1,524		3,124
PCI - Other [Member] | Commercial Portfolio Segment [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	2,695		3,991
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	2,695		3,991
Construction:
Total loans, net of unamortized deferred loan fees and discounts	2,695		3,991
Total loans, net of unamortized deferred loan fees and discounts	2,695		3,991
Total loans, net of unamortized deferred loan fees and discounts	2,695		3,991
PCI - Other [Member] | Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts			675
Consumer:
Total loans, net of unamortized deferred loan fees and discounts			675
Construction:
Total loans, net of unamortized deferred loan fees and discounts			675
Total loans, net of unamortized deferred loan fees and discounts			675
Total loans, net of unamortized deferred loan fees and discounts			675
PCI - Other [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	1,405		1,469
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	1,405		1,469
Construction:
Total loans, net of unamortized deferred loan fees and discounts	1,405		1,469
Total loans, net of unamortized deferred loan fees and discounts	1,405		1,469
Total loans, net of unamortized deferred loan fees and discounts	1,405		1,469
PCI - Other [Member] | Home Equity Loans [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	737		1,682
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	737		1,682
Construction:
Total loans, net of unamortized deferred loan fees and discounts	737		1,682
Total loans, net of unamortized deferred loan fees and discounts	737		1,682
Total loans, net of unamortized deferred loan fees and discounts	737		1,682
PCI - Other [Member] | Other Consumer [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	44		65
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	44		65
Construction:
Total loans, net of unamortized deferred loan fees and discounts	44		65
Total loans, net of unamortized deferred loan fees and discounts	44		65
Total loans, net of unamortized deferred loan fees and discounts	44		65
PCI - Other [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	8,171		12,802
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	8,171		12,802
Construction:
Total loans, net of unamortized deferred loan fees and discounts	8,171		12,802
Total loans, net of unamortized deferred loan fees and discounts	8,171		12,802
Total loans, net of unamortized deferred loan fees and discounts	8,171		12,802
PCI - Other [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts	743		1,377
Consumer:
Total loans, net of unamortized deferred loan fees and discounts	743		1,377
Construction:
Total loans, net of unamortized deferred loan fees and discounts	743		1,377
Total loans, net of unamortized deferred loan fees and discounts	743		1,377
Total loans, net of unamortized deferred loan fees and discounts	$ 743		1,377
PCI - Other [Member] | Residential [Member] | Construction [Member]
Mortgage loans on real estate:
Total loans, net of unamortized deferred loan fees and discounts			675
Consumer:
Total loans, net of unamortized deferred loan fees and discounts			675
Construction:
Total loans, net of unamortized deferred loan fees and discounts			675
Total loans, net of unamortized deferred loan fees and discounts			675
Total loans, net of unamortized deferred loan fees and discounts			$ 675

Loans - Change in Accretable Yi

Loans - Change in Accretable Yield for PCI (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Change in accretable yield:
Balance at beginning of period	$ 7,956	$ 11,775	$ 10,348	$ 13,255
Accretion to interest income	(594)	(961)	(2,554)	(3,068)
Reclassification (to) from nonaccretable difference	(2,893)	(160)	(3,325)	467
Balance at end of period	$ 4,469	$ 10,654	$ 4,469	$ 10,654

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	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	$ 2,931,613	$ 2,712,226	$ 2,931,613	$ 2,712,226	$ 2,759,593
Individ. evaluated for impairment	32,225	29,276	32,225	29,276	28,140
Loans pooled for evaluation	2,883,384	2,656,067	2,883,384	2,656,067	2,706,409
Beginning balance	28,143	35,509	32,503	36,011	36,011
Charge-offs	(861)	(664)	(3,782)	(2,594)	(3,230)
Recoveries	700	2,612	1,614	4,604	5,692
(Benefit) provision	765	(3,973)	(1,588)	(4,537)	(5,970)
Ending balance	28,747	33,484	28,747	33,484	32,503
Ending balance:
Individ. evaluated for impairment	2,140	2,778	2,140	2,778	2,046
Loans pooled for evaluation	26,320	27,946	26,320	27,946	27,760
Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,194,874		2,194,874		2,053,464
Mortgage Loans on Real Estate [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	391,072	368,223	391,072	368,223	368,343
Individ. evaluated for impairment	5,027	5,414	5,027	5,414	4,094
Loans pooled for evaluation	384,640	361,336	384,640	361,336	362,780
Beginning balance	2,495	3,081	2,761	2,896	2,896
Charge-offs	(60)	(50)	(60)	(212)	(321)
Recoveries		391		618	880
(Benefit) provision	(217)	(653)	(470)	(533)	(694)
Ending balance	2,218	2,769	2,218	2,769	2,761
Ending balance:
Individ. evaluated for impairment	240	418	240	418	258
Loans pooled for evaluation	1,978	2,157	1,978	2,157	2,317
Mortgage Loans on Real Estate [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,803,802	1,625,897	1,803,802	1,625,897	1,685,121
Individ. evaluated for impairment	19,788	14,706	19,788	14,706	15,081
Loans pooled for evaluation	1,775,843	1,597,876	1,775,843	1,597,876	1,657,238
Beginning balance	10,119	11,934	11,503	11,015	11,015
Charge-offs	(20)		(170)	(793)	(827)
Recoveries	238	20	365	902	920
(Benefit) provision	1,033	(378)	(342)	452	395
Ending balance	11,370	11,576	11,370	11,576	11,503
Ending balance:
Individ. evaluated for impairment	73	644	73	644	4
Loans pooled for evaluation	11,022	9,493	11,022	9,493	10,050
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	361,320		361,320		366,663
Consumer [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	289,506	301,884	289,506	301,884	289,715
Individ. evaluated for impairment	2,219	3,820	2,219	3,820	3,196
Loans pooled for evaluation	284,335	292,833	284,335	292,833	282,159
Beginning balance	6,156	9,203	7,045	11,253	11,253
Charge-offs	(14)	(122)	(98)	(450)	(585)
Recoveries	189	1,580	487	1,921	2,317
(Benefit) provision	(610)	(2,261)	(1,712)	(4,324)	(5,940)
Ending balance	5,721	8,400	5,721	8,400	7,045
Ending balance:
Individ. evaluated for impairment	363	511	363	511	411
Loans pooled for evaluation	5,347	7,864	5,347	7,864	6,617
Consumer and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	227,479	217,110	227,479	217,110	217,047
Individ. evaluated for impairment	2,938	2,397	2,938	2,397	4,096
Loans pooled for evaluation	221,846	210,565	221,846	210,565	208,960
Beginning balance	4,729	5,265	5,831	5,271	5,271
Charge-offs	(291)	(307)	(1,188)	(421)	(455)
Recoveries	61	85	315	323	404
(Benefit) provision	303	199	(156)	69	611
Ending balance	4,802	5,242	4,802	5,242	5,831
Ending balance:
Individ. evaluated for impairment	1,276	822	1,276	822	1,130
Loans pooled for evaluation	3,526	3,426	3,526	3,426	3,765
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	147,940		147,940		122,419
Construction [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	75,120	57,892	75,120	57,892	55,429
Individ. evaluated for impairment	144	11	144	11	11
Loans pooled for evaluation	74,976	57,338	74,976	57,338	54,743
Beginning balance	1,179	1,321	1,416	899	899
Charge-offs	(33)		(1,104)
Recoveries					54
(Benefit) provision	284	(16)	1,117	406	463
Ending balance	1,430	1,305	1,430	1,305	1,416
Ending balance:
Loans pooled for evaluation	1,430	1,257	1,430	1,257	1,371
Construction [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	72,820	61,295	72,820	61,295	66,990
Loans pooled for evaluation	72,820	61,295	72,820	61,295	66,990
Beginning balance	466	952	680	812	812
Recoveries			1	1	78
(Benefit) provision	159	(528)	(56)	(389)	(210)
Ending balance	625	424	625	424	680
Ending balance:
Loans pooled for evaluation	625	424	625	424	680
Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	45,033	48,314	45,033	48,314	46,182
Individ. evaluated for impairment	1,842	2,650	1,842	2,650	1,508
Loans pooled for evaluation	42,454	43,552	42,454	43,552	42,992
Beginning balance	2,354	3,057	2,645	3,177	3,177
Charge-offs	(94)	(25)	(331)	(118)	(219)
Recoveries	121	429	146	501	590
(Benefit) provision	(390)	(360)	(468)	(459)	(903)
Ending balance	1,991	3,101	1,991	3,101	2,645
Ending balance:
Individ. evaluated for impairment	111	311	111	311	215
Loans pooled for evaluation	1,879	2,730	1,879	2,730	2,366
Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	26,781	31,611	26,781	31,611	30,766
Individ. evaluated for impairment	267	278	267	278	154
Loans pooled for evaluation	26,470	31,272	26,470	31,272	30,547
Beginning balance	645	696	622	688	688
Charge-offs	(349)	(160)	(831)	(600)	(823)
Recoveries	91	107	300	338	449
(Benefit) provision	203	24	499	241	308
Ending balance	590	667	590	667	622
Ending balance:
Individ. evaluated for impairment	77	72	77	72	28
Loans pooled for evaluation	513	595	513	595	594
Receivables Acquired with Deteriorated Credit Quality [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	16,004	26,883	16,004	26,883	25,044
Ending balance:
Loans acquired with deteriorated credit quality	287	2,760	287	2,760	2,697
Receivables Acquired with Deteriorated Credit Quality [Member] | Mortgage Loans on Real Estate [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,405	1,473	1,405	1,473	1,469
Ending balance:
Loans acquired with deteriorated credit quality		181		181	186
Receivables Acquired with Deteriorated Credit Quality [Member] | Mortgage Loans on Real Estate [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	8,171	13,315	8,171	13,315	12,802
Ending balance:
Loans acquired with deteriorated credit quality	275	1,453	275	1,453	1,449
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,952	5,231	2,952	5,231	4,360
Ending balance:
Loans acquired with deteriorated credit quality	12	25	12	25	17
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,695	4,148	2,695	4,148	3,991
Ending balance:
Loans acquired with deteriorated credit quality		994		994	936
Receivables Acquired with Deteriorated Credit Quality [Member] | Construction [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts		543		543	675
Ending balance:
Loans acquired with deteriorated credit quality		48		48	45
Receivables Acquired with Deteriorated Credit Quality [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	737	2,112	737	2,112	1,682
Ending balance:
Loans acquired with deteriorated credit quality		59		59	64
Receivables Acquired with Deteriorated Credit Quality [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	$ 44	$ 61	$ 44	$ 61	$ 65

Allowance for Loan Losses - Pre

Allowance for Loan Losses - Presentation of Credit Quality Indicators (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	$ 2,931,613	$ 2,759,593	$ 2,712,226
Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,606,539	2,356,327
PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	309,070	378,222
PCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	16,004	25,044
Pass [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,544,820	2,305,293
Pass [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	290,053	360,043
Special Mention [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	30,615	27,571
Special Mention [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	14,078	8,549
Substandard [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	31,104	23,463
Substandard [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	4,939	9,630
Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,194,874	2,053,464
Mortgage Loans on Real Estate [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	391,072	368,343	368,223
Mortgage Loans on Real Estate [Member] | Residential [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	321,852	284,539
Mortgage Loans on Real Estate [Member] | Residential [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	67,815	82,335
Mortgage Loans on Real Estate [Member] | Residential [Member] | PCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,405	1,469
Mortgage Loans on Real Estate [Member] | Residential [Member] | Pass [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	317,577	278,635
Mortgage Loans on Real Estate [Member] | Residential [Member] | Pass [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	65,700	79,000
Mortgage Loans on Real Estate [Member] | Residential [Member] | Special Mention [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,831	2,992
Mortgage Loans on Real Estate [Member] | Residential [Member] | Special Mention [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	223	1,849
Mortgage Loans on Real Estate [Member] | Residential [Member] | Substandard [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,444	2,912
Mortgage Loans on Real Estate [Member] | Residential [Member] | Substandard [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,892	1,486
Mortgage Loans on Real Estate [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,803,802	1,685,121	1,625,897
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,588,790	1,425,828
Mortgage Loans on Real Estate [Member] | Commercial [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	206,841	246,491
Mortgage Loans on Real Estate [Member] | Commercial [Member] | PCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	8,171	12,802
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Pass [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,553,178	1,399,936
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Pass [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	191,518	233,326
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Special Mention [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	13,484	14,341
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Special Mention [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	13,155	5,925
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Substandard [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	22,128	11,551
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Substandard [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,168	7,240
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	361,320	366,663
Consumer [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	289,506	289,715	301,884
Consumer [Member] | Home Equity Lines of Credit [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	269,470	263,590
Consumer [Member] | Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	17,084	21,765
Consumer [Member] | Home Equity Lines of Credit [Member] | PCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,952	4,360
Consumer [Member] | Home Equity Lines of Credit [Member] | Pass [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	266,066	258,024
Consumer [Member] | Home Equity Lines of Credit [Member] | Pass [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	15,832	20,442
Consumer [Member] | Home Equity Lines of Credit [Member] | Special Mention [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,196	2,518
Consumer [Member] | Home Equity Lines of Credit [Member] | Special Mention [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	452	509
Consumer [Member] | Home Equity Lines of Credit [Member] | Substandard [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,208	3,048
Consumer [Member] | Home Equity Lines of Credit [Member] | Substandard [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	800	814
Consumer [Member] | Home Equity Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	45,033	46,182	48,314
Consumer [Member] | Home Equity Loans [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	41,486	40,736
Consumer [Member] | Home Equity Loans [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,810	3,764
Consumer [Member] | Home Equity Loans [Member] | PCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	737	1,682
Consumer [Member] | Home Equity Loans [Member] | Pass [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	38,885	37,844
Consumer [Member] | Home Equity Loans [Member] | Pass [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,534	3,506
Consumer [Member] | Home Equity Loans [Member] | Special Mention [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	815	891
Consumer [Member] | Home Equity Loans [Member] | Special Mention [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	209	173
Consumer [Member] | Home Equity Loans [Member] | Substandard [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,786	2,001
Consumer [Member] | Home Equity Loans [Member] | Substandard [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	67	85
Consumer [Member] | Other Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	26,781	30,766	31,611
Consumer [Member] | Other Consumer [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	24,435	28,167
Consumer [Member] | Other Consumer [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,302	2,534
Consumer [Member] | Other Consumer [Member] | PCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	44	65
Consumer [Member] | Other Consumer [Member] | Pass [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	23,978	27,542
Consumer [Member] | Other Consumer [Member] | Pass [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,257	2,437
Consumer [Member] | Other Consumer [Member] | Special Mention [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	368	385
Consumer [Member] | Other Consumer [Member] | Special Mention [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	39	92
Consumer [Member] | Other Consumer [Member] | Substandard [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	89	240
Consumer [Member] | Other Consumer [Member] | Substandard [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	6	5
Consumer and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	227,479	217,047	217,110
Consumer and Industrial [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	215,946	200,735
Consumer and Industrial [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	8,838	12,321
Consumer and Industrial [Member] | PCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,695	3,991
Consumer and Industrial [Member] | Pass [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	209,215	190,902
Consumer and Industrial [Member] | Pass [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	8,832	12,320
Consumer and Industrial [Member] | Special Mention [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,390	6,133
Consumer and Industrial [Member] | Special Mention [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts		1
Consumer and Industrial [Member] | Substandard [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,341	3,700
Consumer and Industrial [Member] | Substandard [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	6
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	147,940	122,419
Construction [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	75,120	55,429	57,892
Construction [Member] | Residential [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	75,108	54,613
Construction [Member] | Residential [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	12	141
Construction [Member] | Residential [Member] | PCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts		675
Construction [Member] | Residential [Member] | Pass [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	75,000	54,602
Construction [Member] | Residential [Member] | Pass [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	12	141
Construction [Member] | Residential [Member] | Substandard [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	108	11
Construction [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	72,820	66,990	$ 61,295
Construction [Member] | Commercial [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	69,452	58,119
Construction [Member] | Commercial [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,368	8,871
Construction [Member] | Commercial [Member] | Pass [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	60,921	57,808
Construction [Member] | Commercial [Member] | Pass [Member] | PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,368	8,871
Construction [Member] | Commercial [Member] | Special Mention [Member] | Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	$ 8,531	$ 311

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017USD ($)Category	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Number of categories occupied under commercial real estate loans | Category	2
Originated Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Impaired TDR Loans	$ 13,352,000	$ 12,371,000	$ 14,882,000
Additional funds in TDR	3,000	25,000	65,000
PNCI Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Impaired TDR Loans	1,611,000	1,324,000	1,476,000
Obligations to lend additional funds on TDR	$ 209,000	$ 0	$ 0
Minimum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Period of collateral payment of loan	3 months
Maximum [Member]
Loans and Leases Receivable Disclosure [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	Sep. 30, 2017	Dec. 31, 2016
Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 8,455	$ 8,687
Current	2,598,084	2,347,640
Total orig. loans	2,606,539	2,356,327
> 90 Days and still accruing	0	0
Nonaccrual loans	11,688	12,894
PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,116	2,600
Current	305,954	375,622
Total orig. loans	309,070	378,222
> 90 Days and still accruing	0	0
Nonaccrual loans	3,026	2,834
30-59 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,831	4,354
30-59 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	178	1,896
60-89 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,579	2,586
60-89 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,911
> 90 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,045	1,747
> 90 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,027	704
Mortgage Loans on Real Estate [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,467	821
Current	320,385	283,718
Total orig. loans	321,852	284,539
> 90 Days and still accruing	0	0
Nonaccrual loans	1,037	255
Mortgage Loans on Real Estate [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,219	1,531
Current	66,596	80,804
Total orig. loans	67,815	82,335
> 90 Days and still accruing	0	0
Nonaccrual loans	1,089	194
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,778	1,920
Current	1,585,012	1,423,908
Total orig. loans	1,588,790	1,425,828
> 90 Days and still accruing	0	0
Nonaccrual loans	6,954	7,651
Mortgage Loans on Real Estate [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,599	154
Current	205,242	246,337
Total orig. loans	206,841	246,491
> 90 Days and still accruing	0	0
Nonaccrual loans	1,599	1,826
Mortgage Loans on Real Estate [Member] | 30-59 Days [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	721	552
Mortgage Loans on Real Estate [Member] | 30-59 Days [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	39	1,510
Mortgage Loans on Real Estate [Member] | 30-59 Days [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,241	317
Mortgage Loans on Real Estate [Member] | 30-59 Days [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		73
Mortgage Loans on Real Estate [Member] | 60-89 Days [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	403	269
Mortgage Loans on Real Estate [Member] | 60-89 Days [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	159
Mortgage Loans on Real Estate [Member] | 60-89 Days [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	793	1,387
Mortgage Loans on Real Estate [Member] | 60-89 Days [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,599
Mortgage Loans on Real Estate [Member] | > 90 Days [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	343
Mortgage Loans on Real Estate [Member] | > 90 Days [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,021	21
Mortgage Loans on Real Estate [Member] | > 90 Days [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	744	216
Mortgage Loans on Real Estate [Member] | > 90 Days [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		81
Consumer [Member] | Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,076	1,441
Current	268,394	262,149
Total orig. loans	269,470	263,590
> 90 Days and still accruing	0	0
Nonaccrual loans	534	1,211
Consumer [Member] | Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	229	863
Current	16,855	20,902
Total orig. loans	17,084	21,765
> 90 Days and still accruing	0	0
Nonaccrual loans	276	742
Consumer [Member] | 30-59 Days [Member] | Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	695	754
Consumer [Member] | 30-59 Days [Member] | Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	100	274
Consumer [Member] | 60-89 Days [Member] | Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	299
Consumer [Member] | 60-89 Days [Member] | Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	129
Consumer [Member] | > 90 Days [Member] | Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	82	687
Consumer [Member] | > 90 Days [Member] | Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		589
Consumer [Member] | Home Equity Loans [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,130	1,225
Current	40,356	39,511
Total orig. loans	41,486	40,736
> 90 Days and still accruing	0	0
Nonaccrual loans	1,199	803
Consumer [Member] | Home Equity Loans [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	45	52
Current	2,765	3,712
Total orig. loans	2,810	3,764
> 90 Days and still accruing	0	0
Nonaccrual loans	50	67
Consumer [Member] | Home Equity Loans [Member] | 30-59 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	662	646
Consumer [Member] | Home Equity Loans [Member] | 30-59 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	27	39
Consumer [Member] | Home Equity Loans [Member] | 60-89 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		395
Consumer [Member] | Home Equity Loans [Member] | 60-89 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	18
Consumer [Member] | Home Equity Loans [Member] | > 90 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	468	184
Consumer [Member] | Home Equity Loans [Member] | > 90 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		13
Consumer [Member] | Other Consumer [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	234	61
Current	24,201	28,106
Total orig. loans	24,435	28,167
> 90 Days and still accruing	0	0
Nonaccrual loans	13	33
Consumer [Member] | Other Consumer [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	17
Current	2,285	2,534
Total orig. loans	2,302	2,534
> 90 Days and still accruing	0	0
Nonaccrual loans	6	5
Consumer [Member] | Other Consumer [Member] | 30-59 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	150	16
Consumer [Member] | Other Consumer [Member] | 30-59 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	12
Consumer [Member] | Other Consumer [Member] | 60-89 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	83	30
Consumer [Member] | Other Consumer [Member] | 60-89 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	5
Consumer [Member] | Other Consumer [Member] | > 90 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1	15
Consumer and Industrial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	770	1,866
Current	215,176	198,869
Total orig. loans	215,946	200,735
> 90 Days and still accruing	0	0
Nonaccrual loans	1,951	2,930
Consumer and Industrial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7
Current	8,831	12,321
Total orig. loans	8,838	12,321
> 90 Days and still accruing	0	0
Nonaccrual loans	6
Consumer and Industrial [Member] | 30-59 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	362	1,148
Consumer and Industrial [Member] | 60-89 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1	84
Consumer and Industrial [Member] | 60-89 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1
Consumer and Industrial [Member] | > 90 Days [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	407	634
Consumer and Industrial [Member] | > 90 Days [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6
Construction [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		932
Current	75,108	53,681
Total orig. loans	75,108	54,613
> 90 Days and still accruing	0	0
Nonaccrual loans		11
Construction [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	12	141
Total orig. loans	12	141
> 90 Days and still accruing	0	0
Construction [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		421
Current	69,452	57,698
Total orig. loans	69,452	58,119
> 90 Days and still accruing	0	0
Construction [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,368	8,871
Total orig. loans	3,368	8,871
> 90 Days and still accruing	$ 0	0
Construction [Member] | 30-59 Days [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		921
Construction [Member] | 60-89 Days [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		421
Construction [Member] | > 90 Days [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		$ 11

Allowance for Loan Losses - Imp

Allowance for Loan Losses - Impaired Loans (Detail) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	$ 22,425	$ 13,243	$ 17,701
Unpaid principal, With no related allowance recorded	23,743	15,442	18,641
Average recorded Investment, With no related allowance recorded	20,064	24,372	26,601
Interest income Recognized, With no related allowance recorded	573	356	757
Recorded investment, With an allowance recorded	5,162	12,246	6,285
Unpaid principal, With an allowance recorded	5,269	12,467	6,349
Related allowance, With an allowance recorded	1,563	2,314	1,544
Average recorded Investment, With an allowance recorded	5,723	10,082	7,100
Interest income Recognized, With an allowance recorded	139	391	206
PNCI Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	3,399	2,953	3,094
Unpaid principal, With no related allowance recorded	3,728	3,223	3,341
Average recorded Investment, With no related allowance recorded	3,247	3,004	3,075
Interest income Recognized, With no related allowance recorded	25	10	17
Recorded investment, With an allowance recorded	1,239	1,161	1,060
Unpaid principal, With an allowance recorded	1,239	1,161	1,060
Related allowance, With an allowance recorded	577	507	502
Average recorded Investment, With an allowance recorded	1,150	2,394	2,344
Interest income Recognized, With an allowance recorded	40	36	49
Mortgage Loans on Real Estate [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	1,777	2,392	1,821
Unpaid principal, With no related allowance recorded	1,819	3,083	1,829
Average recorded Investment, With no related allowance recorded	1,734	3,139	2,853
Interest income Recognized, With no related allowance recorded	51	63	92
Recorded investment, With an allowance recorded	1,644	2,613	1,551
Unpaid principal, With an allowance recorded	1,670	2,701	1,552
Related allowance, With an allowance recorded	167	381	180
Average recorded Investment, With an allowance recorded	1,508	2,309	1,779
Interest income Recognized, With an allowance recorded	39	68	65
Mortgage Loans on Real Estate [Member] | Residential [Member] | PNCI Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	1,356	474	463
Unpaid principal, With no related allowance recorded	1,384	492	486
Average recorded Investment, With no related allowance recorded	910	674	669
Interest income Recognized, With no related allowance recorded	17	7	7
Recorded investment, With an allowance recorded	250	263	259
Unpaid principal, With an allowance recorded	250	263	259
Related allowance, With an allowance recorded	73	81	79
Average recorded Investment, With an allowance recorded	255	131	130
Interest income Recognized, With an allowance recorded	7	7	10
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	17,039	7,011	12,897
Unpaid principal, With no related allowance recorded	17,493	7,286	13,145
Average recorded Investment, With no related allowance recorded	15,092	17,059	20,003
Interest income Recognized, With no related allowance recorded	474	232	570
Recorded investment, With an allowance recorded	1,150	5,820	357
Unpaid principal, With an allowance recorded	1,150	5,843	357
Related allowance, With an allowance recorded	73	644	4
Average recorded Investment, With an allowance recorded	898	3,620	888
Interest income Recognized, With an allowance recorded	40	216	22
Mortgage Loans on Real Estate [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	1,599	1,874	1,826
Unpaid principal, With no related allowance recorded	1,869	2,048	2,031
Average recorded Investment, With no related allowance recorded	1,712	1,503	1,479
Average recorded Investment, With an allowance recorded	66	1,374	1,374
Consumer [Member] | Home Equity Lines of Credit [Member] | Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	1,108	1,888	1,480
Unpaid principal, With no related allowance recorded	1,209	2,318	1,561
Average recorded Investment, With no related allowance recorded	1,294	2,425	2,221
Interest income Recognized, With no related allowance recorded	25	26	40
Recorded investment, With an allowance recorded	110	923	430
Unpaid principal, With an allowance recorded	115	931	440
Related allowance, With an allowance recorded	33	263	110
Average recorded Investment, With an allowance recorded	270	1,324	1,076
Interest income Recognized, With an allowance recorded		16	9
Consumer [Member] | Home Equity Lines of Credit [Member] | PNCI Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	394	502	735
Unpaid principal, With no related allowance recorded	413	573	746
Average recorded Investment, With no related allowance recorded	564	478	594
Interest income Recognized, With no related allowance recorded	8	2	9
Recorded investment, With an allowance recorded	607	507	551
Unpaid principal, With an allowance recorded	607	507	551
Related allowance, With an allowance recorded	328	248	300
Average recorded Investment, With an allowance recorded	579	557	579
Interest income Recognized, With an allowance recorded	20	16	27
Consumer [Member] | Home Equity Loans [Member] | Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	1,470	1,360	715
Unpaid principal, With no related allowance recorded	1,892	1,979	1,135
Average recorded Investment, With no related allowance recorded	1,034	1,154	831
Interest income Recognized, With no related allowance recorded	25	9	6
Recorded investment, With an allowance recorded	199	1,059	594
Unpaid principal, With an allowance recorded	199	1,115	596
Related allowance, With an allowance recorded	13	201	107
Average recorded Investment, With an allowance recorded	342	866	634
Interest income Recognized, With an allowance recorded	7	36	31
Consumer [Member] | Home Equity Loans [Member] | PNCI Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	50	97	67
Unpaid principal, With no related allowance recorded	62	103	74
Average recorded Investment, With no related allowance recorded	59	84	69
Interest income Recognized, With no related allowance recorded		1	1
Recorded investment, With an allowance recorded	123	134	132
Unpaid principal, With an allowance recorded	123	134	132
Related allowance, With an allowance recorded	99	109	108
Average recorded Investment, With an allowance recorded	62	86	85
Interest income Recognized, With an allowance recorded	5	5	7
Consumer [Member] | Other Consumer [Member] | Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	3	7	15
Unpaid principal, With no related allowance recorded	47	11	29
Average recorded Investment, With no related allowance recorded	9	12	17
Interest income Recognized, With no related allowance recorded	(25)		1
Recorded investment, With an allowance recorded	11	8	19
Unpaid principal, With an allowance recorded	12	8	19
Related allowance, With an allowance recorded	7	3	13
Average recorded Investment, With an allowance recorded	14	4	9
Interest income Recognized, With an allowance recorded			2
Consumer [Member] | Other Consumer [Member] | PNCI Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded		6	3
Unpaid principal, With no related allowance recorded		7	4
Average recorded Investment, With no related allowance recorded	2	19	18
Recorded investment, With an allowance recorded	253	257	118
Unpaid principal, With an allowance recorded	253	257	118
Related allowance, With an allowance recorded	71	69	15
Average recorded Investment, With an allowance recorded	185	246	176
Interest income Recognized, With an allowance recorded	8	8	5
Consumer [Member] | Auto Indirect [Member] | Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Average recorded Investment, With no related allowance recorded		1
Consumer and Industrial [Member] | Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	884	574	762
Unpaid principal, With no related allowance recorded	1,139	749	926
Average recorded Investment, With no related allowance recorded	823	575	669
Interest income Recognized, With no related allowance recorded	16	26	48
Recorded investment, With an allowance recorded	2,048	1,823	3,334
Unpaid principal, With an allowance recorded	2,123	1,869	3,385
Related allowance, With an allowance recorded	1,270	822	1,130
Average recorded Investment, With an allowance recorded	2,691	1,959	2,714
Interest income Recognized, With an allowance recorded	53	55	77
Consumer and Industrial [Member] | PNCI Loans [Member]
Financing Receivable, Impaired [Line Items]
Average recorded Investment, With no related allowance recorded		1	1
Recorded investment, With an allowance recorded	6
Unpaid principal, With an allowance recorded	6
Related allowance, With an allowance recorded	6
Average recorded Investment, With an allowance recorded	3
Construction [Member] | Residential [Member] | Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment, With no related allowance recorded	144	11	11
Unpaid principal, With no related allowance recorded	144	16	16
Average recorded Investment, With no related allowance recorded	78	7	7
Interest income Recognized, With no related allowance recorded	$ 7
Construction [Member] | Commercial [Member] | PNCI Loans [Member]
Financing Receivable, Impaired [Line Items]
Average recorded Investment, With no related allowance recorded		$ 245	$ 245

Allowance for Loan Losses - Tro

Allowance for Loan Losses - Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)SecurityLoan	Sep. 30, 2016USD ($)SecurityLoan	Sep. 30, 2017USD ($)SecurityLoan	Sep. 30, 2016USD ($)SecurityLoan
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	15	10	25	24
Pre-mod outstanding principal balance	$ 5,330	$ 674	$ 6,898	$ 1,989
Post-mod outstanding principal balance	5,330	682	6,765	2,035
Financial impact due to TDR taken as additional provision	$ 211	$ 21	$ 133	$ 326
Number that defaulted during the period | SecurityLoan	2	2	3	3
Recorded investment of TDRs that defaulted during the period	$ 318	$ 243	$ 442	$ 330
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
Mortgage Loans on Real Estate [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	1	2	1	3
Pre-mod outstanding principal balance	$ 939	$ 318	$ 939	$ 650
Post-mod outstanding principal balance	939	324	939	656
Financial impact due to TDR taken as additional provision	$ 169	$ 6	$ 169	$ 50
Number that defaulted during the period | SecurityLoan	1	1	2	2
Recorded investment of TDRs that defaulted during the period	$ 99	$ 14	$ 223	$ 101
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
Mortgage Loans on Real Estate [Member] | Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	4	2	7	3
Pre-mod outstanding principal balance	$ 2,886	$ 170	$ 3,509	$ 248
Post-mod outstanding principal balance	2,886	170	3,482	249
Financial impact due to TDR taken as additional provision	$ 14		$ (111)
Number that defaulted during the period | SecurityLoan	1		1
Recorded investment of TDRs that defaulted during the period	$ 219		$ 219
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	0	$ 0	$ 0	$ 0
Consumer [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan		2	3	9
Pre-mod outstanding principal balance		$ 113	$ 187	$ 707
Post-mod outstanding principal balance		$ 114	187	709
Financial impact due to TDR taken as additional provision			27	$ 205
Number that defaulted during the period | SecurityLoan		1		1
Recorded investment of TDRs that defaulted during the period		$ 229		$ 229
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	0	$ 0	$ 0
Consumer [Member] | Home Equity Loans [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	1		1	3
Pre-mod outstanding principal balance	$ 252		$ 252	$ 280
Post-mod outstanding principal balance	252		252	317
Financial impact due to TDR taken as additional provision				46
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	0	$ 0	$ 0	$ 0
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan		1	1	2
Pre-mod outstanding principal balance		$ 8	$ 14	$ 27
Post-mod outstanding principal balance		8	14	27
Financial impact due to TDR taken as additional provision			11	2
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	0	$ 0	0
Consumer [Member] | Auto Indirect [Member]
Financing Receivable, Modifications [Line Items]
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions		$ 0		$ 0
Consumer and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	8	3	11	4
Pre-mod outstanding principal balance	$ 1,109	$ 65	$ 1,854	$ 77
Post-mod outstanding principal balance	1,109	66	1,748	77
Financial impact due to TDR taken as additional provision	28	15	37	23
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	0	$ 0	0
Construction [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	1		1
Pre-mod outstanding principal balance	$ 144		$ 144
Post-mod outstanding principal balance	144		144
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	0	0	0	0
Construction [Member] | Commercial [Member]
Financing Receivable, Modifications [Line Items]
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0

Foreclosed Assets - Summary of

Foreclosed Assets - Summary of Activity in Balance of Foreclosed Assets (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)Assets	Sep. 30, 2016USD ($)Assets
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net			$ 3,986	$ 5,369
Additions/transfers from loans			726	1,953
Dispositions/sales			(1,479)	(3,157)
Valuation adjustments			(162)	(41)
Ending balance, net	$ 3,071	$ 4,124	3,071	4,124
Ending valuation allowance			$ (248)	$ (241)
Ending number of foreclosed assets | Assets			11	15
Proceeds from sale of foreclosed assets			$ 1,787	$ 3,375
Gain (loss) on sale of foreclosed assets	37	69	308	218
Noncovered [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net			3,763	5,369
Additions/transfers from loans			726	1,730
Dispositions/sales			(1,256)	(3,157)
Valuation adjustments			(162)	(41)
Ending balance, net	$ 3,701	3,901	3,701	3,901
Ending valuation allowance			$ (248)	$ (241)
Ending number of foreclosed assets | Assets			11	14
Proceeds from sale of foreclosed assets			$ 1,571	$ 3,375
Gain (loss) on sale of foreclosed assets			315	218
Covered [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net			223
Additions/transfers from loans				223
Dispositions/sales			(223)
Ending balance, net		$ 223		$ 223
Ending number of foreclosed assets | Assets				1
Proceeds from sale of foreclosed assets			216
Gain (loss) on sale of foreclosed assets			$ (7)

Foreclosed Assets - Additional

Foreclosed Assets - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Schedule Of Foreclosed Assets Activity [Line Items]
Foreclosed assets	$ 3,071,000	$ 3,986,000	$ 4,124,000	$ 5,369,000
Residential Real Estate [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Foreclosed assets	1,386,000
Formal foreclosure proceedings	$ 340,000

Premises and Equipment - Summar

Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment, Net, by Type [Abstract]
Land & land improvements	$ 10,021	$ 9,522
Buildings	43,860	42,345
Furniture and equipment	34,530	31,428
Premises and equipment, gross	88,411	83,295
Less: Accumulated depreciation	(39,892)	(37,412)
Premises and equipment less depreciation, gross	48,519	45,883
Construction in progress	6,476	2,523
Total premises and equipment	$ 54,995	$ 48,406

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Depreciation expense for premises and equipment	$ 1,520,000	$ 1,316,000	$ 4,224,000	$ 4,002,000
Fixed assets transferred to held for sale		1,934,000		1,934,000
Write down of fixed assets held for sale		716,000		716,000
Estimated market value of property held for sale		$ 1,218,000		$ 1,218,000

Cash Value of Life Insurance -

Cash Value of Life Insurance - Summary of Activity in Balance of Cash Value of Life Insurance (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)PoliciesEmployeesCompany	Sep. 30, 2016USD ($)PoliciesEmployeesCompany
Increase (Decrease) in Insurance Liabilities [Abstract]
Beginning balance			$ 95,912	$ 94,560
Increase in cash value of life insurance	$ 732	$ 709	2,043	2,086
Death benefit receivable in excess of cash value			108	238
Death benefit receivable			(921)	(1,603)
Ending balance	$ 97,142	$ 95,281	97,142	95,281
End of period death benefit			$ 165,006	$ 166,623
Number of policies owned | Policies			183	187
Insurance companies used | Company			14	14
Current and former employees and directors covered | Employees			57	58

Cash Value of Life Insurance 90

Cash Value of Life Insurance - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017PoliciesCompany	Sep. 30, 2016Company
Insurance [Abstract]
Number of life insurance policies owned by the Company	183
Insurance companies used | Company	14	14
Policies covering current and former employees and directors	57

Goodwill and Other Intangible91

Goodwill and Other Intangible Assets - Summary of Goodwill Intangible (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Ending Balance	$ 64,311
Goodwill, Additions	0
Goodwill, Reductions	0
Goodwill, Beginning Balance	$ 64,311

Goodwill and Other Intangible92

Goodwill and Other Intangible Assets - Summary of Core Deposit Intangibles (Detail) - Core Deposit Intangibles [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Finite-Lived Intangible Assets [Line Items]
Core deposit intangibles, Beginning balance	$ 10,120
Core deposit intangibles, Fully Depreciated	(562)
Core deposit intangibles, Reductions/Amortization	0
Core deposit intangibles, Additions	0
Core deposit intangibles, Ending balance	9,558
Accumulated amortization, Beginning balance	(3,557)
Accumulated amortization, Fully Depreciated	562
Accumulated amortization, Reductions/Amortization	(1,050)
Accumulated amortization, Additions	0
Accumulated amortization, Ending balance	(4,045)
Core deposit intangibles, net, Beginning balance	6,563
Core deposit intangibles, net, Fully Depreciated	0
Core deposit intangibles, net, Reductions/Amortization	(1,050)
Core deposit intangibles, net, Additions	0
Core deposit intangibles, net, Ending balance	$ 5,513

Goodwill and Other Intangible93

Goodwill and Other Intangible Assets - Additional Information (Detail)	Mar. 18, 2016USD ($)Branches	Oct. 03, 2014USD ($)	Sep. 23, 2011USD ($)	May 28, 2010USD ($)
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
Bank of America [Member]
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles	$ 2,046,000
Number of branches | Branches	3

Goodwill and Other Intangible94

Goodwill and Other Intangible Assets - Remaining Estimated Core Deposit Intangible Amortization (Detail) - Core Deposit Intangibles [Member] $ in Thousands	Sep. 30, 2017USD ($)
Finite-Lived Intangible Assets [Line Items]
2,017	$ 339
2,018	1,324
2,019	1,228
2,020	1,228
2,021	969
Thereafter	$ 425

Mortgage Servicing Rights - Fai

Mortgage Servicing Rights - Fair Value of Mortgage Servicing Rights (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]
Servicing, late and ancillary fees received	$ 513	$ 480	$ 1,560	$ 1,513
Weighted-average prepayment speed (CPR)			9.20%	12.80%
Discount rate			14.00%	12.00%
Mortgage Servicing Rights [Member]
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period	6,596	6,720	$ 6,595	$ 7,618	$ 7,618
Additions	147	287	619	788
Change in fair value	(324)	(799)	(795)	(2,198)
Balance at end of period	6,419	6,208	6,419	6,208	6,595
Loans [Member]
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period	822,549	814,702	816,623	817,917	817,917
Balance at end of period	$ 812,005	$ 811,128	$ 812,005	$ 811,128	$ 816,623

Indemnification Asset - Summary

Indemnification Asset - Summary of Activity in Balance of Indemnification Asset (Liability) (Detail) - USD ($) $ in Thousands	May 09, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
FDIC Indemnification Asset [Roll Forward]
Beginning (payable) receivable balance		$ (662)	$ (744)	$ (521)
Effect of actual covered losses and change in estimated future covered losses		17	(224)	(245)
Reimbursable expenses (revenue), net			256	(4)
Payments made (received)	$ (184)	107		232
Gain on termination of loss share agreement	$ (712)		712
Ending (payable) receivable balance		(538)		(538)
Amount of indemnification asset recorded in other assets				95
Amount of indemnification liability recorded in other liabilities				(633)
Ending balance		$ (662)	$ (744)	$ (538)

Indemnification Asset - Additio

Indemnification Asset - Additional Information (Detail) - USD ($) $ in Thousands	May 09, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fdic Agreements And Fdic Indemnification Asset [Line Items]
FDIC indemnification agreement expiry month and year			2020-05
Term of FDIC indemnification agreement			10 years
True up amount payable to FDIC, description			In addition, the agreement specified that at the end of the agreement in May 2020, to the extent that total claimed losses plus servicing expenses, net of recoveries, claimed under the agreement over the entire ten year period of the agreement did not meet a certain threshold, the Company would have been required to pay to the FDIC a “true up” amount equal to fifty percent of the difference of the threshold and actual claimed losses plus servicing expenses, net of recoveries. The Company continually estimated, updated and recorded this “true up” amount, at its estimated present value, since the inception of the agreement in May 2010.
Percentage of true up amount payable to FDIC			50.00%
Payment made to FDIC	$ 184	$ (107)		$ (232)
Gain on termination of loss share agreement	$ 712		$ (712)
Residential Real Estate Loans [Member]
Fdic Agreements And Fdic Indemnification Asset [Line Items]
FDIC indemnification agreement expiry month and year			2018-05
Nonresidential Real Estate Loans [Member]
Fdic Agreements And Fdic Indemnification Asset [Line Items]
FDIC indemnification agreement expiry month and year			2010-05

Other Assets - Summary of Other

Other Assets - Summary of Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred tax asset, net	$ 33,091	$ 36,199
Prepaid expense	3,912	3,045
Software	1,563	2,039
Advanced compensation		249
Capital Trusts	1,706	1,702
Investment in Low Housing Tax Credit Funds	17,453	18,465
Life insurance proceeds receivable	2,242	2,120
Tax refund receivable		6,460
Premises held for sale		2,896
Due from broker	25,757
Miscellaneous other assets	1,212	1,568
Total other assets	$ 86,936	$ 74,743

Deposits - Summary of Balances

Deposits - Summary of Balances of Deposits (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deposits [Abstract]
Noninterest-bearing demand	$ 1,283,949	$ 1,275,745
Interest-bearing demand	965,480	887,625
Savings	1,367,597	1,397,036
Time certificates, over $250,000	74,944	75,184
Other time certificates	235,486	259,970
Total deposits	$ 3,927,456	$ 3,895,560

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Schedule Of Deposits [Line Items]
Overdrawn deposit balances classified as consumer loans	$ 1,219,000	$ 1,191,000
California [Member]
Schedule Of Deposits [Line Items]
Certificate of deposits, included in time certificates $250,000 and over	$ 50,000,000	$ 50,000,000

Reserve for Unfunded Commitm101

Reserve for Unfunded Commitments - Summary of Activity in Reserve for Unfunded Commitments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 2,599	$ 2,883	$ 2,719	$ 2,475
Change in reserve for unfunded commitments	390	25	270	433
Balance at end of period	$ 2,989	$ 2,908	$ 2,989	$ 2,908

Other Liabilities - Components

Other Liabilities - Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Deferred compensation	$ 6,431	$ 6,525
Pension liability	27,238	26,645
Joint beneficiary agreements	3,192	3,007
Low income housing tax credit fund commitments	11,439	15,176
Accrued salaries and benefits expense	6,176	5,704
Loan escrow and servicing payable	2,264	2,146
Deferred Revenue	1,759	726
Litigation contingency	1,450	1,450
Miscellaneous other liabilities	2,901	5,985
Total other liabilities	$ 62,850	$ 67,364

Other Borrowings - Summary of B

Other Borrowings - Summary of Balances of Other Borrowings (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Collateralized borrowing, fixed rate, as of September 30, 2017 of 1.11% & 0.05%, payable on October 2, 2017	$ 12,993,000	$ 17,493,000
Total other borrowings	98,730,000	17,493,000
1.11% Fixed Rate FHLB Collateralized Borrowings [Member]
Debt Instrument [Line Items]
Collateralized borrowing, fixed rate, as of September 30, 2017 of 1.11% & 0.05%, payable on October 2, 2017	85,737,000
0.05% Fixed Rate Collateralized Borrowings [Member]
Debt Instrument [Line Items]
Collateralized borrowing, fixed rate, as of September 30, 2017 of 1.11% & 0.05%, payable on October 2, 2017	$ 12,993,000	$ 17,493,000

Other Borrowings - Summary o104

Other Borrowings - Summary of Balances of Other Borrowings (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2017
1.11% Fixed Rate FHLB Collateralized Borrowings [Member]
Debt Instrument [Line Items]
Collateralized borrowing, fixed rate	1.11%
Collateralized borrowing, maturity date	Oct. 2, 2017
0.05% Fixed Rate Collateralized Borrowings [Member]
Debt Instrument [Line Items]
Collateralized borrowing, fixed rate	0.05%
Collateralized borrowing, maturity date	Oct. 2, 2017

Other Borrowings - Additional I

Other Borrowings - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Security repurchase agreement	$ 0	$ 0
FHLB collateral line of credit, maximum borrowings capacity	1,303,462,000
FHLB collateral line of credit, outstanding balance	85,737,000
FHLB collateral line of credit, remaining borrowing capacity	1,217,725,000
Loans designated as potential collateral under collateralized line of credit with FHLB	70,534,000
Investment securities designated as potential collateral under collateral line of credit	1,919,515,000
Other collateralized borrowings	12,993,000	$ 17,493,000
Repurchase investment securities sold and pledged as collateral under securities repurchase agreement	27,150,000
Collateralized line of credit with San Francisco Federal Reserve Bank, maximum borrowings capacity	130,985,000
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	130,985,000
Investment securities designated as potential collateral under collateral line of credit with San Francisco Federal Reserve Bank	18,000
Loans designated as potential collateral under collateral line of credit with San Francisco Federal Reserve Bank	232,290,000
Unused correspondent banking lines of credit from commercial banks for federal funds	$ 20,000,000

Junior Subordinated Debt - Addi

Junior Subordinated Debt - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017USD ($)LocationTrust	Dec. 31, 2016USD ($)	Oct. 03, 2014USD ($)
Class of Stock [Line Items]
Number of subsidiary business trusts | Trust	5
Trust preferred securities amount	$ 62,900,000
Subordinated debenture, recorded fair value	$ 56,810,000	$ 56,667,000
Number of locations organized | Location	2
Maximum [Member]
Class of Stock [Line Items]
Consecutive payments of interest on debenture defer Period	5 years
Prior to Amendment [Member]
Class of Stock [Line Items]
Subordinated debenture, recorded fair value	$ 143,000
Post Amendment [Member]
Class of Stock [Line Items]
Subordinated debenture, recorded fair value	$ 56,810,000
North Valley Bancorp [Member]
Class of Stock [Line Items]
Number of locations acquired | Location	3
Acquisition, completion date	Oct. 3, 2014
North Valley Trust II [Member]
Class of Stock [Line Items]
Subordinated debenture, recorded fair value	$ 5,125,000	5,095,000	$ 5,006,000
North Valley Trust III [Member]
Class of Stock [Line Items]
Subordinated debenture, recorded fair value	4,032,000	4,005,000	3,918,000
North Valley Trust IV [Member]
Class of Stock [Line Items]
Subordinated debenture, recorded fair value	$ 6,415,000	$ 6,329,000	$ 6,063,000

Junior Subordinated Debt - Summ

Junior Subordinated Debt - Summary of Terms and Recorded Balance of Subordinated Debenture (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Oct. 03, 2014
Subordinated Borrowing [Line Items]
Subordinated debenture, Face Value	$ 62,889,000
Subordinated debenture, Recorded Book Value	$ 56,810,000	$ 56,667,000
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, Current Coupon Rate	4.35%
Subordinated debenture, Recorded Book Value	$ 20,619,000	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, Current Coupon Rate	3.86%
Subordinated debenture, Recorded Book Value	$ 20,619,000	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
Subordinated debenture, Current Coupon Rate	4.56%
Subordinated debenture, Recorded Book Value	$ 5,125,000	5,095,000	$ 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
Subordinated debenture, Current Coupon Rate	4.11%
Subordinated debenture, Recorded Book Value	$ 4,032,000	4,005,000	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
Subordinated debenture, Current Coupon Rate	2.65%
Subordinated debenture, Recorded Book Value	$ 6,415,000	$ 6,329,000	$ 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)	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)$ / sharesshares	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)site$ / sharesshares	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)shares	Aug. 21, 2007shares
Conversion of Stock [Line Items]
Reserves to satisfy Federal regulatory requirements	$ 79,226,000		$ 79,226,000		$ 78,183,000
Number of sites leased under non-cancelable operating leases | site			42
Rent expense under operating leases	1,038,000	$ 1,034,000	$ 3,134,000	$ 3,024,000
Rent expense offset by rent income	$ 10,000	$ 58,000	$ 34,000	$ 177,000
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.
Cost of settlement			$ 1,450,000
Class B common stock of Visa Inc. | shares	22,941,464		22,941,464		22,867,802	15,814,662
Conversion ratio	1.648265		1.648265
Maximum [Member]
Conversion of Stock [Line Items]
Settlement amount			$ 1,900,000
Common Class B [Member]
Conversion of Stock [Line Items]
Class B common stock of Visa Inc. | shares	13,396		13,396
Common Class A [Member]
Conversion of Stock [Line Items]
The value of the Class A shares | $ / shares	$ 105.24		$ 105.24
Value of unredeemed Class A equivalent shares	$ 2,324,000		$ 2,324,000

Commitments and Contingencie109

Commitments and Contingencies - Future Minimum Commitments under Non-Cancelable Operating Leases with Initial or Remaining Terms of One Year or More (Detail) $ in Thousands	Sep. 30, 2017USD ($)
Leases [Abstract]
2,017	$ 3,320
2,018	2,523
2,019	1,924
2,020	1,325
2,021	963
Thereafter	1,696
Future minimum lease payments	$ 11,751

Commitments and Contingencie110

Commitments and Contingencies - Summary of Bank's Commitments and Contingent Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
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	170,416	97,399
RE Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	63,290	42,184
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	12,700	12,763
Commercial [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	253,673	220,836
Consumer Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	422,521	406,855
Deposit Account Overdraft Privilege [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 96,650	$ 98,583

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Aug. 21, 2007
Class of Stock [Line Items]
Repurchase of common stock							500,000
Stock repurchase plan percentage of common stock							3.20%
Common stock, shares outstanding	22,941,464		22,941,464		22,867,802		15,814,662
Repurchased shares outstanding	166,600		166,600
Market value of common stock			$ 3,854,000	$ 2,774,000
Maximum [Member]
Class of Stock [Line Items]
Cash dividend payable by bank					$ 82,615,000
Tri Counties Bank [Member]
Class of Stock [Line Items]
Cash dividends received	$ 5,185,000	$ 4,097,000	$ 14,394,000	$ 11,434,000
Stock Repurchase Plan [Member]
Class of Stock [Line Items]
Stock repurchase plan, number of shares repurchased			0		0
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares outstanding	22,941,464	22,827,277	22,941,464	22,827,277	22,867,802	22,775,173
Stock repurchase plan, number of shares repurchased			107,390	101,125
Company's common stock in lieu of cash to exercise options to purchase shares	21,738	4,129	107,390	101,125
Market value of common stock	$ 762,000	$ 108,000	$ 3,854,000	$ 2,774,000

Stock Options and Other Equi112

Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options under the plan	458,400	592,250
Options currently not exercisable yet expected to vest	27,300
Weighted-average remaining contractual term	1 year 1 month 6 days
Pre-tax compensation costs expected to recognize	$ 157,000
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	70,650	68,450
Weighted-average remaining contractual term	1 year 6 months
Pre-tax compensation costs	$ 1,686,000
Number of units released	28,397
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	52,829	47,426
Weighted-average remaining contractual term	1 year 7 months 6 days
Pre-tax compensation costs	$ 839,000
Number of units released	18,805
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	79,243
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	411,900
Options available for grant under the plan	527,651
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	123,479
2001 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options under the plan	46,500
Options available for grant under the plan	0
Share based compensation grant expiry period	10 years

Stock Options and Other Equi113

Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2017$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, Number of Shares, beginning balance | shares	592,250
Options granted, Number of Shares | shares	0
Options exercised, Number of Shares | shares	(133,850)
Options forfeited, Number of Shares | shares	0
Options outstanding, Number of Shares, ending balance | shares	458,400
Options outstanding, Weighted Average Exercise Price, beginning balance	$ 17.12
Options granted, Weighted Average Exercise Price	0
Options exercised, Weighted Average Exercise Price	18.07
Options forfeited, Weighted Average Exercise Price	0
Options outstanding, Weighted Average Exercise Price, ending balance	16.85
Options granted, Weighted Average Fair Value on Date of Grant	0
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	14.54
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	23.21
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	$ 23.21

Stock Options and Other Equi114

Stock Options and Other Equity-Based Incentive Instruments - Summary of Options Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options	458,400	592,250
Weighted average exercise price	$ 16.85	$ 17.12
Intrinsic value (in thousands)	$ 10,958
Weighted average remaining contractual term (yrs.)	4 years 1 month 6 days
Currently Exercisable [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options	431,100
Weighted average exercise price	$ 16.61
Intrinsic value (in thousands)	$ 10,406
Weighted average remaining contractual term (yrs.)	4 years
Currently Not Exercisable [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options	27,300
Weighted average exercise price	$ 20.54
Intrinsic value (in thousands)	$ 552
Weighted average remaining contractual term (yrs.)	6 years 1 month 6 days

Stock Options and Other Equi115

Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs) [Member]	9 Months Ended
	Sep. 30, 2017$ / sharesshares
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	47,426
RSUs granted, Number of RSUs	17,939
Additional market plus service condition RSUs vested	6,269
RSUs released, Number of RSUs	(18,805)
RSUs outstanding, Number of RSUs, ending balance	52,829
RSUs granted, Weighted Average Fair Value on Date of Grant | $ / shares	$ 32.95
Service Condition Vesting RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding, Number of RSUs, beginning balance	68,450
RSUs granted, Number of RSUs	29,669
RSUs added through dividend credits, Number of RSUs	939
RSUs released, Number of RSUs	(28,397)
RSUs forfeited/expired, Number of RSUs	(11)
RSUs outstanding, Number of RSUs, ending balance	70,650
RSUs granted, Weighted Average Fair Value on Date of Grant | $ / shares	$ 35.36

Noninterest Income and Expen116

Noninterest Income and Expense - Components of Other Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Service charges on deposit accounts	$ 4,160				$ 3,641			$ 12,102	$ 10,549
ATM and interchange fees	4,209				3,851			12,472	11,136
Other service fees	917				792			2,521	2,369
Mortgage banking service fees	514				537			1,561	1,570
Change in value of mortgage servicing rights	(325)				(799)			(795)	(2,198)
Total service charges and fees	9,475				8,022			27,861	23,426
Gain on sale of loans	606				953			2,293	2,645
Commissions on sale of non-deposit investment products	672				747			1,984	1,890
Increase in cash value of life insurance	732				709			2,043	2,086
Gain on sale of investment securities	961							961
Change in indemnification asset					(10)			490	(274)
Gain on sale of foreclosed assets	37				69			308	218
Sale of customer checks	89				110			287	299
Lease brokerage income	234				172			601	602
Loss on disposal of fixed assets	(33)				(13)			(61)	(52)
Life Insurance death benefit in excess of cash value								108	238
Other	157				307			668	1,023
Total other noninterest income	3,455				3,044			9,682	8,675
Total noninterest income	12,930	$ 12,910	$ 11,703	$ 12,462	11,066	$ 11,245	$ 9,790	37,543	32,101
Mortgage loan servicing fees, net of change in fair value of mortgage loan servicing rights	189				(262)			766	(628)
Mortgage banking revenue	$ 795				$ 691			$ 3,059	$ 2,017

Noninterest Income and Expen117

Noninterest Income and Expense - Components of Noninterest Expense (Detail) $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2017USD ($)Staff	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)Staff	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Sep. 30, 2017USD ($)Staff	Sep. 30, 2016USD ($)Staff
Schedule Of Other Noninterest Income And Expense [Line Items]
Base salaries, net of deferred loan origination costs	$ 13,600				$ 13,419			$ 40,647	$ 39,095
Incentive compensation	2,609				2,798			6,980	7,008
Benefits and other compensation costs	4,724				4,643			14,693	14,067
Total salaries and benefits expense	20,933				20,860			62,320	60,170
Occupancy	2,799				2,667			8,196	7,504
Equipment	1,816				1,607			5,344	4,837
Data processing and software	2,495				2,068			7,332	6,266
ATM & POS network charges	1,425				1,915			3,353	3,923
Telecommunications	716				702			2,027	2,085
Postage	325				381			1,058	1,186
Courier service	235				280			752	816
Advertising	1,039				1,049			3,173	3,021
Assessments	427				654			1,252	1,864
Operational losses	301				497			1,166	1,006
Professional fees	901				1,018			2,357	3,183
Foreclosed assets expense	41				37			117	197
Provision for foreclosed asset losses	134				8			162	40
Change in reserve for unfunded commitments	390				25			270	433
Intangible amortization	339				359			1,050	1,017
Merger expense									784
Litigation contingent liability									1,450
Other	2,906				3,289			9,019	9,652
Total other noninterest expense	16,289				16,556			46,628	49,264
Total noninterest expense	$ 37,222	$ 35,904	$ 35,822	$ 36,563	$ 37,416	$ 38,267	$ 33,751	$ 108,948	109,434
Total merger expense									$ 784
Average full time equivalent staff | Staff	993				1,022			1,005	996
Noninterest expense to revenue (FTE)	64.60%				69.40%			64.50%	69.00%
North Valley Bancorp [Member]
Schedule Of Other Noninterest Income And Expense [Line Items]
Base salaries (outside temporary help)									$ 187
Equipment									35
Professional fees									342
Advertising and marketing									114
Other									$ 106

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	6.90%	6.90%	6.80%	6.70%
Tax-exempt interest on municipal obligations	(1.90%)	(1.70%)	(1.80%)	(1.90%)
Increase in cash value of insurance policies	(1.30%)	(1.20%)	(1.30%)	(1.60%)
Low income housing tax credits	(0.50%)	(0.30%)	(0.40%)	(0.30%)
Equity compensation	(0.80%)		(1.40%)
Other	0.10%		0.20%	0.10%
Effective Tax Rate	37.50%	38.70%	37.10%	38.00%

Earnings Per Share - Computatio

Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 11,897	$ 13,589	$ 12,079	$ 12,533	$ 12,199	$ 9,405	$ 10,674	$ 37,565	$ 32,278
Average number of common shares outstanding	22,932				22,825			22,901	22,804
Effect of dilutive stock options and restricted stock units	312				274			338	273
Average number of common shares outstanding used to calculate diluted earnings per share	23,244				23,099			23,239	23,077
Options excluded from diluted earnings per share because the effect of these options was antidilutive					12				18

Comprehensive Income - Componen

Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (4,612)	$ (7,913)
Net Unrealized Loss on Available For Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, before tax	(3,459)	(8,870)
Accumulated other comprehensive loss, tax effect	1,455	3,729
Accumulated other comprehensive loss	(2,004)	(5,141)
Unfunded Status of Supplemental Retirement Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, before tax	(4,431)	(4,714)
Accumulated other comprehensive loss, tax effect	1,863	1,982
Accumulated other comprehensive loss	(2,568)	(2,732)
Joint Beneficiary Agreement Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, before tax	(40)	(40)
Accumulated other comprehensive loss	$ (40)	$ (40)

Comprehensive Income - Compo121

Comprehensive Income - Components of Other Comprehensive Income and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Equity [Abstract]
Unrealized holding gains (losses) on available for sale securities before reclassifications	$ 674	$ (2,058)	$ 6,372	$ 11,240
Amounts reclassified out of accumulated other comprehensive income	(961)		(961)
Unrealized holding (losses) gains on available for sale securities after reclassifications	(287)	(2,058)	5,411	11,240
Tax effect	121	865	(2,274)	(4,726)
Unrealized holding (losses) gains on available for sale securities, net of tax	(166)	(1,193)	3,137	6,514
Change in unfunded status of the supplemental retirement plans before reclassifications	0	0	0	0
Amounts reclassified out of accumulated other comprehensive income:
Amortization of prior service cost	(1)	(10)	(5)	(30)
Amortization of actuarial losses	96	138	288	413
Total amounts reclassified out of accumulated other comprehensive income	95	128	283	383
Change in unfunded status of the supplemental retirement plans after reclassifications	95	128	283	383
Tax effect	(40)	(54)	(119)	(161)
Change in unfunded status of the supplemental retirement plans, net of tax	55	74	164	222
Change in joint beneficiary agreement liability before reclassifications		(1)		(5)
Amounts reclassified out of accumulated other comprehensive income	0	0	0	0
Change in joint beneficiary agreement liability after reclassifications		(1)		(5)
Tax effect	0	0	0	0
Change in joint beneficiary agreement liability, net of tax		(1)		(5)
Total other comprehensive (loss) income	$ (111)	$ (1,120)	$ 3,301	$ 6,731

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Employee service period under ESOP			1 year
Deferred compensation obligations	$ 6,431,000		$ 6,431,000			$ 6,525,000
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%
Employer's contribution to retirement plan	$ 224,000	$ 187,000	$ 595,000	$ 648,000
Supplemental Retirement Plans [Member] | Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer's contribution to retirement plan					$ 1,117,000

Retirement Plans - Summary of 4

Retirement Plans - Summary of 401(k) Contribution Plan (Detail) - 401(k) Plan [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
401(k) Plan benefits expense	$ 164	$ 187	$ 603	$ 515
401(k) Plan contributions made by the Company	$ 224	$ 187	$ 595	$ 648

Retirement Plans - Summary of E

Retirement Plans - Summary of ESOP Activities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Retirement Benefits [Abstract]
ESOP benefits expense	$ 537	$ 463	$ 1,610	$ 1,368
ESOP contributions made by the Company	$ 537		$ 2,073	$ 905

Retirement Plans - Schedule of

Retirement Plans - Schedule of Deferred Compensation Earnings Credits Included in Noninterest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Retirement Benefits [Abstract]
Deferred compensation earnings credits included in noninterest expense	$ 111	$ 111	$ 365	$ 366

Retirement Plans - Net Periodic

Retirement Plans - Net Periodic Benefit Cost Recognized for Supplemental Retirement Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net pension cost included the following components:
Service cost-benefits earned during the period	$ 235	$ 260	$ 706	$ 781
Interest cost on projected benefit obligation	248	256	743	769
Amortization of net obligation at transition		1	1	1
Amortization of prior service cost	(3)	(10)	(8)	(30)
Recognized net actuarial loss	98	137	292	412
Net periodic pension cost	578	644	1,734	1,933
Company contributions to pension plans	267	260	856	834
Pension plan payouts to participants	$ 267	$ 260	$ 856	$ 834

Related Party Transactions - Su

Related Party Transactions - Summary of Activity in Lending Transactions (Detail) - Directors and Officers [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Beginning balance	$ 2,432	$ 4,201
Advances/new loans	160	730
Removed/payments	(666)	(2,499)
Ending balance	$ 1,926	$ 2,432

Fair Value Measurement - Record

Fair Value Measurement - Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value Measurements on Recurring Basis [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 684,655	$ 556,828
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	554,062	429,678
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	121,217	117,617
Marketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,957	2,938
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,957	2,938
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	2,957	2,938
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	675,279	547,295
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	554,062	429,678
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	121,217	117,617
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	6,419	6,595
Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	6,419	6,595
Mortgage Servicing Rights [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 6,419	$ 6,595

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers between level 1 to level 2, Assets	$ 0	$ 0
Transfers between level 2 to level 1, Assets	0	0
Transfers between level 1 to level 2, Liabilities	0	0
Transfers between level 2 to level 1, Liabilities	0	0
Transfer into level 3	0	0
Transfer out of level 3	0	0
Carrying value of loans fully charged-off	0
Securities held to maturity	536,567,000	602,536,000
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	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 6,596	$ 6,720	$ 6,595	$ 7,618
Additions	147	287	619	788
Change in fair value	(324)	(799)	(795)	(2,198)
Balance at end of period	$ 6,419	$ 6,208	$ 6,419	$ 6,208

Fair Value Measurement - Quanti

Fair Value Measurement - Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate	9.20%	12.80%
Discount rate	14.00%	12.00%
Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortgages Servicing Rights, Fair Value	$ 6,419	$ 6,208	$ 6,595	$ 6,596	$ 6,720	$ 7,618
Minimum [Member] | Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	14.00%		14.00%
Minimum [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate	6.50%		6.90%
Maximum [Member] | Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	16.00%		16.00%
Maximum [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate	21.40%		16.60%
Weighted Average [Member] | Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	14.00%		14.00%
Weighted Average [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate	9.20%		8.80%

Fair Value Measurement - Assets

Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 1,026		$ 1,107
Fair Value Nonrecurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	3,088	$ 7,742	3,360
Total Gains/(Losses)	(1,049)	(556)	(495)
Fair Value Nonrecurring Basis [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	1,026	5,941	1,107
Total Gains/(Losses)	(892)	(570)	(409)
Fair Value Nonrecurring Basis [Member] | Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,062	1,801	2,253
Total Gains/(Losses)	(157)	14	(86)
Fair Value Nonrecurring Basis [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	3,088	7,742	3,360
Fair Value Nonrecurring Basis [Member] | 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	1,026	5,941	1,107
Fair Value Nonrecurring Basis [Member] | 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	$ 2,062	$ 1,801	$ 2,253

Fair Value Measurement - Qua133

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	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 1,026	$ 1,107
Foreclosed Assets [Member] | Land & Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	960	15
Foreclosed Assets [Member] | Residential Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	822	1,564
Foreclosed Assets [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 280	$ 674
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	(74.00%)
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	(53.00%)
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	(47.00%)
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	(46.00%)
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	21.00%
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	283.00%
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	39.00%
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	63.00%
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	(32.00%)
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	230.00%
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	3.30%
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	26.00%
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	0.00%
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	0.00%
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	0.00%

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 ($)	Sep. 30, 2017	Dec. 31, 2016
Financial assets:
Cash and due from banks	$ 86,815,000	$ 92,197,000
Cash at Federal Reserve and other banks	101,219,000	213,415,000
Securities held to maturity	536,567,000	602,536,000
Financial liabilities:
Other borrowings	98,730,000	17,493,000
Junior subordinated debt	56,810,000	56,667,000
Level 3 [Member]
Financial assets:
Securities held to maturity	0	0
Level 3 [Member] | Overdraft Privilege Commitments [Member]
Off-balance sheet:
Contract amount, Off-balance sheet	96,650,000	98,583,000
Level 3 [Member] | Standby Letters of Credit [Member]
Off-balance sheet:
Contract amount, Off-balance sheet	12,700,000	12,763,000
Level 3 [Member] | Commitments [Member]
Off-balance sheet:
Contract amount, Off-balance sheet	909,900,000	767,274,000
Fair Value [Member] | Level 3 [Member]
Financial assets:
Loans, net	2,928,059,000	2,763,473,000
Financial liabilities:
Junior subordinated debt	55,259,000	49,033,000
Fair Value [Member] | Level 3 [Member] | Overdraft Privilege Commitments [Member]
Off-balance sheet:
Fair value, Off-balance sheet	967,000	986,000
Fair Value [Member] | Level 3 [Member] | Standby Letters of Credit [Member]
Off-balance sheet:
Fair value, Off-balance sheet	128,000	128,000
Fair Value [Member] | Level 3 [Member] | Commitments [Member]
Off-balance sheet:
Fair value, Off-balance sheet	9,099,000	7,673,000
Fair Value [Member] | Level 1 [Member]
Financial assets:
Cash and due from banks	86,815,000	92,197,000
Cash at Federal Reserve and other banks	101,219,000	213,415,000
Fair Value [Member] | Level 2 [Member]
Financial assets:
Securities held to maturity	542,123,000	603,203,000
Loans held for sale	2,733,000	2,998,000
Financial liabilities:
Deposits	3,925,527,000	3,893,941,000
Other borrowings	98,730,000	17,493,000
Carrying Amount [Member] | Level 3 [Member]
Financial assets:
Loans, net	2,902,866,000	2,727,090,000
Financial liabilities:
Junior subordinated debt	56,810,000	56,667,000
Carrying Amount [Member] | Level 1 [Member]
Financial assets:
Cash and due from banks	86,815,000	92,197,000
Cash at Federal Reserve and other banks	101,219,000	213,415,000
Carrying Amount [Member] | Level 2 [Member]
Financial assets:
Securities held to maturity	536,567,000	602,536,000
Restricted equity securities	16,956,000	16,956,000
Loans held for sale	2,733,000	2,998,000
Financial liabilities:
Deposits	3,927,456,000	3,895,560,000
Other borrowings	$ 98,730,000	$ 17,493,000

TriCo Bancshares Condensed F135

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Assets
Cash and Cash equivalents	$ 188,034	$ 305,612	$ 315,088	$ 303,461
Other assets	86,936	74,743
Total assets	4,656,435	4,517,968
Liabilities and shareholders' equity
Other liabilities	62,850	67,364
Junior subordinated debt	56,810	56,667
Total liabilities	4,149,702	4,040,621
Shareholders' equity:
Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 22,941,464 and 22,867,802 shares, respectively	255,231	252,820
Retained earnings	256,114	232,440
Accumulated other comprehensive loss, net	(4,612)	(7,913)
Total shareholders' equity	506,733	477,347	481,890	452,116
Total liabilities and shareholders' equity	4,656,435	4,517,968
Parent [Member]
Assets
Cash and Cash equivalents	3,278	2,802	$ 2,768	$ 2,565
Investment in Tri Counties Bank	558,986	529,907
Other assets	1,729	1,711
Total assets	563,993	534,420
Liabilities and shareholders' equity
Other liabilities	450	406
Junior subordinated debt	56,810	56,667
Total liabilities	57,260	57,073
Shareholders' equity:
Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 22,941,464 and 22,867,802 shares, respectively	255,231	252,820
Retained earnings	256,114	232,440
Accumulated other comprehensive loss, net	(4,612)	(7,913)
Total shareholders' equity	506,733	477,347
Total liabilities and shareholders' equity	$ 563,993	$ 534,420

TriCo Bancshares Condensed F136

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets (Parenthetical) (Detail) - $ / shares	Sep. 30, 2017	Dec. 31, 2016	Aug. 21, 2007
Condensed Financial Statements, Captions [Line Items]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	22,941,464	22,867,802
Common stock, shares outstanding	22,941,464	22,867,802	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	22,941,464	22,867,802
Common stock, shares outstanding	22,941,464	22,867,802

TriCo Bancshares Condensed F137

TriCo Bancshares Condensed Financial Statements (Parent Only) - Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Interest expense	$ 1,829	$ 1,610	$ 1,491	$ 1,460	$ 1,439	$ 1,430	$ 1,392	$ 4,930	$ 4,261
Income before income taxes	19,027	21,236	19,431	20,487	19,893	14,911	17,232	59,694	52,036
Equity in net income of Tri Counties Bank:
Income tax benefit	(7,130)	(7,647)	(7,352)	(7,954)	(7,694)	(5,506)	(6,558)	(22,129)	(19,758)
Net income	11,897	$ 13,589	$ 12,079	$ 12,533	12,199	$ 9,405	$ 10,674	37,565	32,278
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Interest expense	652				562			1,870	1,643
Administration expense	209				158			586	548
Income before income taxes	(861)				(720)			(2,456)	(2,191)
Equity in net income of Tri Counties Bank:
Distributed	5,185				4,096			14,394	11,434
(Over) under distributed	7,211				8,522			24,594	22,116
Income tax benefit	362				301			1,033	919
Net income	$ 11,897				$ 12,199			$ 37,565	$ 32,278

TriCo Bancshares Condensed F138

TriCo Bancshares Condensed Financial Statements (Parent Only) - Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net income	$ 11,897	$ 13,589	$ 12,079	$ 12,533	$ 12,199	$ 9,405	$ 10,674	$ 37,565	$ 32,278
Other comprehensive income (loss), net of tax:
Unrealized holding (losses) gains on available for sale securities arising during the period	(166)				(1,193)			3,137	6,514
Change in minimum pension liability	55				74			164	222
Change in joint beneficiary liability					(1)				(5)
Other comprehensive (loss) income	(111)				(1,120)			3,301	6,731
Comprehensive income	11,786				11,079			40,866	39,009
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	11,897				12,199			37,565	32,278
Other comprehensive income (loss), net of tax:
Unrealized holding (losses) gains on available for sale securities arising during the period	(166)				(1,193)			3,137	6,514
Change in minimum pension liability	55				74			164	222
Change in joint beneficiary liability					(1)				(5)
Other comprehensive (loss) income	(111)				(1,120)			3,301	6,731
Comprehensive income	$ 11,786				$ 11,079			$ 40,866	$ 39,009

TriCo Bancshares Condensed F139

TriCo Bancshares Condensed Financial Statements (Parent Only) - Statements of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net income	$ 11,897	$ 13,589	$ 12,079	$ 12,533	$ 12,199	$ 9,405	$ 10,674	$ 37,565	$ 32,278
Adjustments to reconcile net income to net cash provided by operating activities:
Equity compensation vesting expense								1,184	1,078
Net cash from operating activities								45,817	38,884
Financing activities:
Equity compensation net (excess tax benefit) tax expense									(182)
Repurchase of common stock								(1,629)	(384)
Cash dividends paid - common								(11,228)	(10,265)
Net cash provided by financing activities								100,469	40,109
Net change in cash and cash equivalents								(117,578)	11,627
Cash and cash equivalents and beginning of year			305,612	315,088			303,461	305,612	303,461
Cash and cash equivalents at end of period	188,034			305,612	315,088			188,034	315,088
Parent [Member]
Operating activities:
Net income	11,897				12,199			37,565	32,278
Adjustments to reconcile net income to net cash provided by operating activities:
Over (under) distributed equity in earnings of Tri Counties Bank	(7,211)				(8,522)			(24,594)	(22,116)
Equity compensation vesting expense								1,184	1,078
Equity compensation net (excess tax benefit) tax expense									182
Net change in other assets and liabilities								(1,015)	(906)
Net cash from operating activities								13,140	10,516
Financing activities:
Issuance of common stock through option exercise								193	518
Equity compensation net (excess tax benefit) tax expense									(182)
Repurchase of common stock								(1,629)	(384)
Cash dividends paid - common								(11,228)	(10,265)
Net cash provided by financing activities								(12,664)	(10,313)
Net change in cash and cash equivalents								476	203
Cash and cash equivalents and beginning of year			$ 2,802	2,768			$ 2,565	2,802	2,565
Cash and cash equivalents at end of period	$ 3,278			$ 2,802	$ 2,768			$ 3,278	$ 2,768

Regulatory Matters - Additional

Regulatory Matters - Additional Information (Detail)	Dec. 31, 2019	Sep. 30, 2017	Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Increase in risk-based capital ratios		0.625%
Forecast [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum capital level requirements	10.50%
Minimum capital level requirements, Tier 1 capital ratio	8.50%
Forecast [Member] | Common Stock [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum capital level requirements, Tier 1 capital ratio	7.00%
Basel III Phase-in Schedule [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum capital level requirements		1.25%	0.625%

Regulatory Matters - Actual and

Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Basel III Phase-in Schedule [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	1.25%	0.625%
Tri Countries Bank [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 522,718	$ 500,876
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	490,982	465,654
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	490,982	465,654
Tier 1 Capital (to Average Assets), Actual, Amount	$ 490,982	$ 465,654
Total Capital (to Risk Weighted Assets), Actual, Ratio	14.35%	14.71%
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.48%	13.67%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.48%	13.66%
Tier 1 Capital (to Average Assets), Actual, Ratio	10.92%	10.56%
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 364,278	$ 340,529
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	291,422	274,725
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	236,781	221,344
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 224,900	$ 220,426
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	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	$ 336,957	$ 293,706
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	264,102	225,601
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	209,460	174,521
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 179,920	$ 176,341
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	9.25%	8.625%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	7.25%	6.625%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	5.75%	5.125%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%	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	$ 382,492	$ 357,556
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	309,636	289,450
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	254,995	238,370
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 179,920	$ 176,341
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	10.50%	10.50%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.50%	8.50%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	7.00%	7.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%
Parent [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 525,569	$ 503,283
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	493,833	468,061
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	439,498	414,632
Tier 1 Capital (to Average Assets), Actual, Amount	$ 493,833	$ 468,061
Total Capital (to Risk Weighted Assets), Actual, Ratio	14.42%	14.77%
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.55%	13.74%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	12.06%	12.17%
Tier 1 Capital (to Average Assets), Actual, Ratio	10.98%	10.62%
Parent [Member] | Basel III Phase-in Schedule [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 337,117	$ 293,854
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	264,227	225,714
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	209,559	174,609
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 179,925	$ 176,346
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	9.25%	8.625%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	7.25%	6.625%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	5.75%	5.125%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%	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	$ 382,673	$ 357,735
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	309,783	289,595
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	255,116	238,490
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 179,925	$ 176,346
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	10.50%	10.50%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.50%	8.50%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	7.00%	7.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%

Summary of Quarterly Results142

Summary of Quarterly Results of Operations (Unaudited) - Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Loans:
Discount accretion PCI - cash basis	$ 398	$ 386	$ 112	$ 483	$ 777	$ 426	$ 269
Discount accretion PCI - other	407	797	631	658	569	415	(45)
Discount accretion PNCI	559	987	798	637	883	1,459	868
All other loan interest income	35,904	34,248	33,373	34,463	33,540	32,038	33,646
Total loan interest income	37,268	36,418	34,914	36,241	35,769	34,338	34,738	$ 108,600	$ 104,845
Debt securities, dividends and interest bearing cash at Banks (not FTE)	8,645	8,626	8,570	8,374	7,940	8,252	8,056
Total interest and dividend income	45,913	45,044	43,484	44,615	43,709	42,590	42,794	134,441	129,093
Interest expense	1,829	1,610	1,491	1,460	1,439	1,430	1,392	4,930	4,261
Net interest income	44,084	43,434	41,993	43,155	42,270	41,160	41,402	129,511	124,832
(Benefit from reversal of) provision for loan losses	765	(796)	(1,557)	(1,433)	(3,973)	(773)	209	(1,588)	(4,537)
Net interest income after provision for loan losses	43,319	44,230	43,550	44,588	46,243	41,933	41,193	131,099	129,369
Noninterest income	12,930	12,910	11,703	12,462	11,066	11,245	9,790	37,543	32,101
Noninterest expense	37,222	35,904	35,822	36,563	37,416	38,267	33,751	108,948	109,434
Income before income taxes	19,027	21,236	19,431	20,487	19,893	14,911	17,232	59,694	52,036
Income tax expense	7,130	7,647	7,352	7,954	7,694	5,506	6,558	22,129	19,758
Net income	$ 11,897	$ 13,589	$ 12,079	$ 12,533	$ 12,199	$ 9,405	$ 10,674	$ 37,565	$ 32,278
Per common share:
Net income (diluted)	$ 0.51	$ 0.58	$ 0.52	$ 0.54	$ 0.53	$ 0.41	$ 0.46	$ 1.62	$ 1.40
Dividends	$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.49	$ 0.45

Subsequent Event - Additional I

Subsequent Event - Additional Information (Detail)	Oct. 24, 2017USD ($)Loans	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Subsequent Event [Line Items]
Loans recorded balance		$ 2,902,866,000	$ 2,727,090,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of loans collateralized | Loans	39
Loans recorded balance	$ 15,808,000
Subsequent Event [Member] | Residential Real Estate [Member]
Subsequent Event [Line Items]
Number of loans collateralized | Loans	32
Loans recorded balance	$ 9,192,000
Subsequent Event [Member] | Residential Real Estate [Member] | Loss from Catastrophes [Member]
Subsequent Event [Line Items]
Number of loans collateralized | Loans	9
Loans recorded balance	$ 2,636,000
Subsequent Event [Member] | Commercial Real Estate [Member]
Subsequent Event [Line Items]
Number of loans collateralized | Loans	7
Loans recorded balance	$ 6,616,000
Subsequent Event [Member] | Commercial Real Estate [Member] | Loss from Catastrophes [Member]
Subsequent Event [Line Items]
Number of loans collateralized | Loans	1
Loans recorded balance	$ 4,062,000