TriCo Bancshares (TCBK) 10-K 2 Mar 20 2019 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 24, 2020	Jun. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Entity File Number	0-10661
Entity Registrant Name	TriCo Bancshares
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	94-2792841
Entity Address, Address Line One	63 Constitution Drive
Entity Address, City or Town	Chico
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95973
City Area Code	530
Local Phone Number	898-0300
Title of 12(b) Security	Common Stock
Trading Symbol	TCBK
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1,003,743,000
Entity Common Stock, Shares Outstanding		30,432,929
Document Annual Report	true
Document Transition Report	false
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Central Index Key	0000356171
Current Fiscal Year End Date	--12-31

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 92,816	$ 119,781
Cash at Federal Reserve and other banks	183,691	107,752
Cash and cash equivalents	276,507	227,533
Investment securities
Marketable equity securities	2,960	2,874
Available for sale debt securities	950,138	1,115,036
Held to maturity debt securities	375,606	444,936
Restricted equity securities	17,250	17,250
Loans held for sale	5,265	3,687
Loans	4,307,366	4,022,014
Allowance for loan losses	(30,616)	(32,582)
Total loans, net	4,276,750	3,989,432
Premises and equipment, net	87,086	89,347
Cash value of life insurance	117,823	117,318
Accrued interest receivable	18,897	19,412
Goodwill	220,872	220,972
Other intangible assets, net	23,557	29,280
Operating leases, right-of-use	27,879	0
Other assets	70,591	75,364
Total assets	6,471,181	6,352,441
Deposits
Noninterest-bearing demand	1,832,665	1,760,580
Interest-bearing	3,534,329	3,605,886
Total deposits	5,366,994	5,366,466
Accrued interest payable	2,407	1,997
Operating lease liability	27,540	0
Other liabilities	91,984	83,724
Other borrowings	18,454	15,839
Junior subordinated debt	57,232	57,042
Total liabilities	5,564,611	5,525,068
Commitments and contingencies
Shareholders' equity
Preferred stock, no par value: 1,000,000 shares authorized; zero issued and outstanding at December 31, 2019 and 2018	0	0
Common stock, no par value: 50,000,000 shares authorized; issued and outstanding: 30,523,824 and 30,417,223 at December 31, 2019 and 2018, respectively	543,998	541,762
Retained earnings	367,794	303,490
Accumulated other comprehensive loss, net of tax	(5,222)	(17,879)
Total shareholders’ equity	906,570	827,373
Total liabilities and shareholders’ equity	$ 6,471,181	$ 6,352,441
Statement of Financial Position Parenthetical
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	30,523,824	30,417,223
Common stock, shares outstanding (in shares)	30,523,824	30,417,223

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest and dividend income
Loans, including fees	$ 223,750	$ 186,117	$ 146,794
Investments
Taxable securities	39,810	33,997	27,772
Tax exempt securities	4,002	4,345	4,165
Dividends	1,285	1,705	1,324
Interest bearing cash at Federal Reserve and other banks	3,597	2,054	1,347
Total interest and dividend income	272,444	228,218	181,402
Interest expense
Deposits	11,716	6,996	3,958
Other borrowings	387	2,745	305
Junior subordinated debt	3,272	3,131	2,535
Total interest expense	15,375	12,872	6,798
Net interest income	257,069	215,346	174,604
Provision for (benefit from) loan losses	(1,690)	2,583	89
Net interest income after provision for (benefit from) loan losses	258,759	212,763	174,515
Noninterest income
Service charges and fees	40,417	38,460	37,423
Commissions on sale of non-deposit investment products	2,877	3,151	2,729
Increase in cash value of life insurance	3,029	2,718	2,685
Gain on sale of loans	3,282	2,371	3,109
Gain on sale of investment securities	110	207	961
Other	3,805	2,154	2,545
Total noninterest income	53,520	49,061	49,452
Noninterest expense
Salaries and related benefits	106,065	93,942	82,930
Other	79,392	74,530	63,525
Total noninterest expense	185,457	168,472	146,455
Income before income taxes	126,822	93,352	77,512
Provision for income taxes	34,750	25,032	36,958
Net income	$ 92,072	$ 68,320	$ 40,554
Earnings per share
Basic	$ 3.02	$ 2.57	$ 1.77
Diluted	$ 3	$ 2.54	$ 1.74

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 22,890	$ 23,395	$ 23,061	$ 22,726	$ 23,211	$ 16,170	$ 15,029	$ 13,910	$ 92,072	$ 68,320	$ 40,554
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available for sale securities arising during the period, after reclassifications									17,159	(12,434)	3,165
Change in minimum pension liability, after reclassifications									(4,502)	388	(370)
Change in joint beneficiary agreement liability									0	426	(110)
Other comprehensive income (loss)									12,657	(11,620)	2,685
Comprehensive income									$ 104,729	$ 56,700	$ 43,239

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (loss)
Beginning balance at Dec. 31, 2016	$ 477,347	$ 252,820	$ 232,440	$ (7,913)
Beginning balance, shares at Dec. 31, 2016		22,867,802
Net income	40,554		40,554
Other comprehensive income (loss)	2,685			2,685
Stock option vesting	259	$ 259
Service condition RSU vesting	895	895
Market plus service condition RSU vesting	432	432
Stock options exercised	2,621	$ 2,621
Stock options exercised, shares		145,850
Service condition RSUs released	0
Service condition RSUs released, shares		30,896
Tax benefit from release of service condition RSUs	0
Tax benefit from release of service condition RSUs, shares		18,805
Repurchase of common stock	$ (3,854)	$ (1,191)	(2,663)
Repurchase of common stock, shares	0	(107,390)
Dividends paid	$ (15,131)		(15,131)
Dividends paid, per share	$ 0.66
Ending balance at Dec. 31, 2017	$ 505,808	$ 255,836	255,200	(5,228)
Ending balance, shares at Dec. 31, 2017		22,955,963
Net income	68,320		68,320
Other comprehensive income (loss)	(11,620)			(11,620)
Adoption of ASU | Adoption ASU 2016-01			(62)	62
Adoption of ASU | Adoption ASU 2018-02			1,093	(1,093)
Stock option vesting	75	$ 75
Service condition RSU vesting	1,017	1,017
Market plus service condition RSU vesting	370	370
Stock options exercised	$ 1,704	$ 1,704
Stock options exercised, shares	100,400	100,400
Service condition RSUs released	$ 0
Service condition RSUs released, shares		35,060
Market plus service condition RSUs released	0
Market plus service conditions RSUs released, shares		25,512
Issuance of common stock	284,437	$ 284,437
Issuance of common stock, shares		7,405,277
Repurchase of common stock	$ (3,969)	$ (1,677)	(2,292)
Repurchase of common stock, shares	(196,566)	(104,989)
Dividends paid	$ (18,769)		(18,769)
Dividends paid, per share	$ 0.70
Ending balance at Dec. 31, 2018	$ 827,373	$ 541,762	303,490	(17,879)
Ending balance, shares at Dec. 31, 2018	30,417,223	30,417,223
Net income	$ 92,072		92,072
Other comprehensive income (loss)	12,657			12,657
Service condition RSU vesting	1,161	$ 1,161
Market plus service condition RSU vesting	493	493
Stock options exercised	$ 2,921	$ 2,921
Stock options exercised, shares	182,500	182,500
Service condition RSUs released	$ 0
Service condition RSUs released, shares		33,060
Market plus service condition RSUs released	0
Market plus service conditions RSUs released, shares		22,237
Repurchase of common stock	$ (5,108)	$ (2,339)	(2,769)
Repurchase of common stock, shares	0	(131,196)
Dividends paid	$ (24,999)		(24,999)
Dividends paid, per share	$ 0.82
Ending balance at Dec. 31, 2019	$ 906,570	$ 543,998	$ 367,794	$ (5,222)
Ending balance, shares at Dec. 31, 2019	30,523,824	30,523,824

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income	$ 92,072	$ 68,320	$ 40,554
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	6,915	7,014	6,787
Amortization of intangible assets	5,723	3,499	1,389
Provision for (benefit from) loan losses	(1,690)	2,583	89
Amortization of investment securities premium, net	2,547	2,512	3,200
Gain on sale of investment securities	(110)	(207)	(961)
Originations of loans for resale	(131,074)	(84,245)	(114,107)
Proceeds from sale of loans originated for resale	131,689	86,988	114,788
Gain on sale of loans	(3,282)	(2,371)	(3,109)
Change in market value of mortgage servicing rights	1,811	146	718
(Reversal of) provision for losses on real estate owned	(102)	89	162
Deferred income tax expense	1,692	2,600	12,473
Gain on sale or transfer of loans, to real estate owned	(608)	(408)	(711)
Operating lease payments	(4,931)
Loss on disposal of fixed assets	82	185	142
Increase in cash value of life insurance	(3,029)	(2,718)	(2,685)
Gain on life insurance death benefit	(831)		(108)
(Gain) loss on marketable equity securities	(86)	64
Equity compensation vesting expense	1,654	1,462	1,586
Change in
Interest receivable	515	(5,640)	(1,745)
Interest payable	410	1,067	112
Amortization of operating lease ROUA	4,592
Other assets and liabilities, net	(1,153)	10,129	(3,193)
Net cash from operating activities	102,806	91,069	55,381
Investing activities
Cash acquired in acquisition, net of consideration paid	0	30,613
Proceeds from maturities of securities available for sale	97,993	73,014	63,942
Proceeds from maturities of securities held to maturity	68,346	68,937	86,371
Proceeds from sale of available for sale securities	127,066	293,279	25,757
Purchases of securities available for sale	(37,253)	(436,678)	(265,806)
Net redemption of restricted equity securities	0	7,429
Loan origination and principal collections, net	(286,339)	(173,752)	(259,404)
Proceeds from sale of real estate owned	1,336	2,527	2,872
Proceeds from sale of premises and equipment	0	63	3,338
Purchases of premises and equipment	(4,293)	(7,435)	(15,164)
Life insurance proceeds	3,355		649
Net cash from investing activities	(29,789)	(142,003)	(357,445)
Financing activities
Net change in deposits	528	365,400	113,571
Net change in other borrowings	2,615	(271,327)	104,673
Repurchase of common stock, net	(2,196)	(2,483)	(1,629)
Dividends paid	(24,999)	(18,769)	(15,131)
Exercise of stock options	9	218	396
Net cash from financing activities	(24,043)	73,039	201,880
Net change in cash and cash equivalents	48,974	22,105	(100,184)
Cash and cash equivalents at beginning of year	227,533	205,428	305,612
Cash and cash equivalents at end of year	276,507	227,533	205,428
Supplemental disclosure of noncash activities
Unrealized (loss) gain on securities available for sale	24,361	(17,627)	5,461
Loans transferred to foreclosed assets	1,249	1,262	1,563
Market value of shares tendered in-lieu of cash to pay for exercise of options and/or related taxes	5,108	1,486	2,225
Obligations incurred in conjunction with leased assets	156
Supplemental disclosure of cash flow activity
Cash paid for interest expense	14,965	11,805	5,609
Cash paid for income taxes	35,050	14,525	21,170
Assets acquired in acquisition and goodwill, net	0	1,463,100	0
Liabilities assumed in acquisition	$ 0	$ 1,171,968	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
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 and retail banking business in 29 California counties. The Company has five capital subsidiary business trusts (collectively, the “Capital Trusts”) that issued trust preferred securities, including two organized by the Company and three acquired with the acquisition of North Valley Bancorp. 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. All adjustments necessary for a fair presentation of these consolidated financial statements have been included and are of a normal and recurring nature. 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 $1,719,000 are accounted for under the equity method and, accordingly, are included in other assets on the consolidated balance sheets. 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 sheets. 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. Segment and Significant Group Concentration of Credit Risk The Company grants agribusiness, commercial, consumer, and residential loans to customers located throughout Northern and Central 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. Geographical Descriptions For the purpose of describing the geographical location of the Company’s operations, the Company has defined northern California as that area of California north of, and including, Stockton to the east and San Jose to the west; central California as that area of the state south of Stockton and San Jose, to and including, Bakersfield to the east and San Luis Obispo to the west; and southern California as that area of the state south of Bakersfield and San Luis Obispo. Business Combinations The Company accounts for acquisitions of businesses using the acquisition method of accounting. Under the acquisition method, assets acquired and liabilities assumed are recorded at their estimated fair values at the date of acquisition. Management utilizes various valuation techniques including discounted cash flow analyses to determine these fair values. Any excess of the purchase price over amounts allocated to the acquired assets, including identifiable intangible assets, and liabilities assumed is recorded as goodwill. 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. Marketable Equity Securities As of December 31, 2017, marketable equity securities with a fair value of $2,874,000 were recorded within investment securities available for sale on the consolidated balance sheets with changes in the fair value recorded through other comprehensive income and accumulated other comprehensive income (loss). As of January 1, 2018, the Company adopted the new accounting standard for Financial Instruments using a prospective transition approach, which requires equity investments to be measured at fair value with changes in fair value recognized in net income. The adoption of this guidance resulted in a $62,000 decrease to beginning retained earnings and a decrease to the deferred tax of $18,000. During the twelve months ended December 31, 2019 and 2018, the Company recognized ($86,000) of unrealized gains and $64,000 of unrealized losses, respectively, in the consolidated statements of income related to changes in the fair value of marketable equity securities. Debt Securities The Company classifies its debt 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 and changes in the value of these securities are recorded through earnings. 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. Discounts are amortized or accreted over the expected life of the related investment security as an adjustment to yield using the effective interest method. Premiums on callable debt securities are generally amortized to the earliest call date of the security with the exception of mortgage backed securities, where estimated prepayments, if any, are considered. Dividend and interest income are recognized when earned. Realized gains and losses are derived from the amortized cost of the security sold. The Company did not have any debt securities classified as trading during 2019 and 2018. The Company assesses other-than-temporary impairment (“OTTI”) based on whether it intends to sell a security or if it is likely that the Company would be required to sell the security before recovery of the amortized cost basis of the investment, which may be maturity. For debt securities, if we intend to sell the security or it is more likely than not that we will be required to sell the security before recovering its cost basis, the entire impairment loss would be recognized in earnings as an OTTI. If we do not intend to sell the security and it is not likely that we will be required to sell the security but we do not expect to recover the entire amortized cost basis of the security, only the portion of the impairment loss representing credit losses would be recognized in earnings. The credit loss on a security is measured as the difference between the amortized cost basis and the present value of the cash flows expected to be collected. Projected cash flows are discounted by the original or current effective interest rate depending on the nature of the security being measured for potential OTTI. The remaining impairment related to all other factors, the difference between the present value of the cash flows expected to be collected and fair value, is recognized as a charge to other comprehensive income (“OCI”). Impairment losses related to all other factors are presented as separate categories within OCI. The accretion of the amount recorded in OCI increases the carrying value of the investment and does not affect earnings. If there is an indication of additional credit losses the security is re-evaluated according to the procedures described above. No OTTI losses were recognized during the years ended December 31, 2019, 2018 or 2017. 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. Both cash and stock dividends are reported as income when received. 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 non-interest 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 to 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 considered 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, if any, certain repayment 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 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 an estimate of these probable incurred losses inherent in the portfolio. The Company formally assesses the adequacy of the allowance for originated loan losses on a quarterly basis. Determination of the adequacy is based on ongoing assessments of the probable risk in the outstanding originated loan portfolio, and to a lesser extent the Company’s originated loan commitments. These assessments include the periodic re-grading of credits based on changes in their individual credit characteristics including delinquency, seasoning, recent financial performance of the borrower, economic factors, changes in the interest rate environment, growth of the portfolio as a whole or by segment, and other factors as warranted. Loans are initially graded when originated. They are re-graded as they are renewed, when there is a new loan to the same borrower, when identified facts demonstrate changes in the risk of repayment, or if they become delinquent. Re-grading of larger problem loans occurs at least quarterly. Confirmation of the quality of the grading process is obtained by periodic independent credit reviews conducted by consultants specifically hired for this purpose and by various bank regulatory agencies. The Company’s method for assessing the appropriateness of the allowance for originated loan losses includes specific allowances for impaired originated loans, formula allowance factors for pools of credits, and allowances for changing environmental factors (e.g., interest rates, growth, economic conditions, etc.). Allowance factors for loan pools are 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 measured and recorded at their fair value as of the acquisition date. Loans acquired with evidence of credit deterioration since origination for which it is probable that all contractually required payments will not be collected are referred to as purchased credit impaired (PCI) loans. PCI loans are recorded at fair value at acquisition date, factoring in credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for loan losses is not carried over or recorded as of the acquisition date. Fair value is defined as the present value of the future estimated principal and interest payments of the loan, with the discount rate used in the present value calculation representing the estimated effective yield of the loan. Default rates, loss severity, and prepayment speed assumptions are periodically reassessed and our estimate of future payments is adjusted accordingly. The difference between contractual future payments and estimated future payments is referred to as the nonaccretable difference. The difference between estimated future payments and the present value of the estimated future payments is referred to as the accretable yield. The accretable yield represents the amount that is expected to be recorded as interest income over the remaining life of the loan. If after acquisition, the Company determines that the estimated future cash flows of a PCI loan are expected to be more than originally estimated, an increase in the discount rate (effective yield) would be made such that the newly increased accretable yield would be recognized, on a level yield basis, over the remaining estimated life of the loan. If, thereafter, the Company determines that the estimated future cash flows of a PCI loan are expected to be less than previously estimated, an allowance for loan loss would be established through a provision for loan losses charged to expense to decrease the present value to the required level. If the estimated cash flows improve after an allowance has been established for a loan, the allowance may be partially or fully reversed depending on the improvement in the estimated cash flows. Only after the allowance has been fully reversed may the discount rate be increased. PCI loans are put on nonaccrual status when cash flows cannot be reasonably estimated. PCI loans on nonaccrual status are accounted for using the cost recovery method or cash basis method of income recognition. PCI loans are charged off when evidence suggests cash flows are not recoverable. Foreclosed assets from PCI loans are recorded in foreclosed assets at fair value with the fair value at time of foreclosure representing estimated proceeds less selling costs from the collateral securing the loan. PCI loans with similar risk characteristics and acquisition time frame may be “pooled” and have their cash flows aggregated as if they were one loan or accounted for individually. Acquired loans that are not PCI loans are referred to as purchased not credit impaired (PNCI) loans and interest income is accrued on a level-yield basis. For income recognition purposes, this method assumes that all contractual cash flows will be collected, and no allowance for loan losses is established at the time of acquisition. Post-acquisition date, an allowance for loan losses may need to be established for acquired loans through a provision charged to earnings for credit losses incurred subsequent to acquisition. The loss estimate for acquired loans is measured based on the probable shortfall in relation to the contractual note requirements, consistent with our allowance for loan loss policy for similar loans. Throughout these financial statements, reference to “Loans” or “Allowance for loan losses” relates to all categories of loans, including Originated, PNCI, and PCI. When not referring to all categories of loans, specific reference to Originated, PNCI, or PCI is made. 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. Real Estate Owned Real estate owned (REO) includes assets acquired through, or in lieu of, loan foreclosure. REO is held for sale and are initially recorded at fair value less estimated costs to sell at the date of acquisition, 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 non-interest expense, along with the gain or loss on sale of REO. 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 years for furniture and equipment and 15-40 years for land improvements and buildings. Company Owned Life Insurance The Company has purchased life insurance policies on certain key executives. Company owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. 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 non-interest income. If the Bank decided to surrender any of the policies prior to the death of the insured, such surrender may result in a tax expense related to the life-to-date cumulative increase in cash value of the policy. If the Bank retains such policies until the death of the insured, the Bank would receive nontaxable proceeds from the insurance company equal to the death benefit of the policies. The Bank has entered into Joint Beneficiary Agreements (JBAs) with certain of the insured that provide some level of sharing of the death benefit, less the cash surrender value, among the Bank and the beneficiaries of the insured upon the receipt of death benefits. Goodwill, Other Intangible and Long-Lived Assets Goodwill represents the excess of costs over fair value of net assets of businesses acquired from a business combination. The Company has an identifiable intangible asset consisting of core deposit intangibles (“CDI”). CDI are amortized over their respective estimated useful lives, and reviewed periodically for impairment. Goodwill and other intangible assets acquired in a business combination and determined to have an indefinite useful life are not amortized, but instead tested for impairment at least annually. Other intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values, and reviewed periodically for impairment. As of September 30 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. 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. 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 non-interest 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, when earned, and changes in fair value of the MSR, are recorded in non-interest income. 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. Leases The Company adopted ASU 2016-2 “Leases” (Topic 842) as of January 1, 2019, which requires the Company to record a right-of-use asset (“ROUA”) on the consolidated balance sheets for those leases that convey rights to control use of identified assets for a period of time in exchange for consideration. The Company is also required to record a lease liability on the consolidated balance sheets for the present value of future payment commitments. Substantially all of the Company’s leases are comprised of operating leases in which the Company is lessee of real estate property for branches, ATM locations, and general administration and operations. The Company elected not to include short-term leases (i.e. leases with initial terms of twelve months or less) within the ROUA and lease liability. Known or determinable adjustments to the required minimum future lease payments were included in the calculation of the Company’s ROUA and lease liability. Adjustments to the required minimum future lease payments that are variable and will not be determinable until a future period, such as changes in the consumer price index, are included as variable lease costs. Additionally, expected variable payments for common area maintenance, taxes and insurance were unknown and not determinable at lease commencement and therefore, were not included in the determination of the Company’s ROUA or lease liability. The value of the ROUA and lease liability is impacted by the amount of the periodic payment required, length of the lease term, and the discount rate used to calculate the present value of the minimum lease payments. The Company’s lease agreements often include one or more options to renew at the Company’s discretion. If at lease inception, the Company considers the exercising of a renewal option to be reasonably certain, the Company will include the extended term in the calculation of the ROU asset and lease liability. The Company uses the rate implicit in the lease whenever this rate is readily determinable. As this rate is rarely determinable, the Company utilizes its incremental borrowing rate at lease inception, on a collateralized basis, over a similar term. For operating leases existing prior to January 1, 2019, the rate for the remaining lease term as of January 1, 2019 was used. The lease liability is reduced based on the discounted present value of remaining payments as of each reporting period. The ROUA value is measured using the am

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Business Combinations	Note 2 – Business Combinations Merger with FNB Bancorp On July 6, 2018, the Company completed the acquisition of FNB Bancorp (“FNBB”) for an aggregate transaction value of $291,132,000. FNBB was merged into the Company, and the Company issued 7,405,277 shares of common stock to the former shareholders of FNBB. FNBB’s subsidiary, First National Bank of Northern California, merged into the Bank on the same day. The Company also paid $6.7 million to settle and retire all FNBB stock options outstanding as of the acquisition date. Upon the consummation of the merger, the Company added 12 branches within San Mateo, San Francisco, and Santa Clara counties. In accordance with accounting for business combinations, the Company recorded $156,561,000 of goodwill and $27,605,000 of core deposit intangibles on the acquisition date. The core deposit intangibles is being amortized over the weighted average remaining life of 6.2 years with no significant residual value. For tax purposes, purchase prices accounting adjustments including goodwill are all non-taxable and /or non-deductible. Acquisition related costs of $0, $5,227,000 and $530,000 are included in the consolidated income statement for each of the years ended December 31, 2019, 2018 and 2017, respectively. The acquisition was consistent with the Company’s strategy to expand into the Bay Area market. The acquisition offers the Company the opportunity to increase profitability by introducing existing products and services to the acquired customer base as well as add new customers in the expanded region. Goodwill arising from the acquisition consisted largely of the estimated cost savings resulting from the combined operations. The following table summarizes the consideration paid for FNBB and the amounts of assets acquired and liabilities assumed that were recorded at the acquisition date (in thousands). FNB Bancorp Fair value of consideration transferred: Fair value of shares issued $ 284,437 Cash consideration 6,695 Total fair value of consideration transferred 291,132 Assets acquired: Cash and cash equivalents 37,308 Securities available for sale 335,667 Restricted equity securities 7,723 Loans 834,683 Premises and equipment 30,522 Cash value of life insurance 16,817 Core deposit intangible 27,605 Other assets 16,214 Total assets acquired 1,306,539 Liabilities assumed: Deposits 991,935 Other liabilities 15,033 Short-term borrowings—Federal Home Loan Bank 165,000 Total liabilities assumed 1,171,968 Total net assets acquired 134,571 Goodwill recognized $ 156,561 A summary of the estimated fair value adjustments resulting in the goodwill recorded in the FNB Bancorp acquisition are presented below (in thousands): FNB Bancorp Value of stock consideration paid to FNB Bancorp Shareholders $ 284,437 Cash consideration 6,695 Less: Cost basis net assets acquired 114,030 Fair value adjustments: Investments (1,081) Loans (22,390) Premises and Equipment 21,590 Core deposit intangible 27,327 Deferred income taxes (6,394) Other 1,489 Goodwill $ 156,561 The fair value of net assets acquired includes fair value adjustments to certain loans that were not considered impaired (PNCI loans) as of the acquisition date. The fair value adjustments were determined using discounted contractual cash flows. As such, these loans were not considered impaired at the acquisition date and were not subject to the guidance relating to purchased credit impaired loans (PCI loans), which have shown evidence of credit deterioration since origination. The gross contractual amounts receivable and fair value for PNCI loans as of the acquisition date was $866,189,000 and $833,381,000, respectively. The gross contractual amounts receivable and fair value for PCI loans as of the acquisition date was $1,683,000 and $1,302,000, respectively. At the acquisition date, the Company was unable to estimate the expected contractual cash flows to be collected from the purchased credit impaired loans. The table below presents the unaudited proforma information as if the acquisition of FNB Bancorp had occurred on January 1, 2017 after giving effect to certain acquisition accounting adjustments. The proforma information for the years ended December 31, 2018 and 2017 includes acquisition adjustments for the amortization/accretion on loans, core deposit intangibles, and related income tax effects. The proforma financial information also includes one-time costs associated with the acquisitions but does not include expected costs savings synergies that we expect to achieve. The unaudited pro forma financial information is not necessarily indicative of the results of operations that would have occurred had the transaction been effected on the assumed date. Year ended December 31, 2018 December 31, 2017 (in thousands, except per share data) Summarized proforma income statement data: Net interest income $ 242,793 $ 227,795 (Provision for) benefit from loan losses (2,180) 271 Noninterest income 51,152 53,881 Noninterest expense (180,884) (181,833) Income before taxes 110,881 100,114 Income taxes (30,337) (47,352) Net income $ 80,544 $ 52,762 Basic earnings per share $ 2.65 $ 1.74 Diluted earnings per share $ 2.63 $ 1.72 It is impracticable to separately provide information regarding the revenue and earnings of FNB Bancorp included in the Company’s consolidated income statement from the July 6, 2018 acquisition date to December 31, 2018 because the operations of FNBB were substantially comingled with the operations of the Company as of the system conversion date of July 22, 2018.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2019
Investments Schedule [Abstract]
Investment Securities	Note 3 – Investment Securities The amortized cost and estimated fair values of investment securities classified as available for sale and held to maturity are summarized in the following tables: December 31, 2019 Amortized Gross Gross Estimated (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 466,139 $ 7,261 $ (420) $ 472,980 Obligations of states and political subdivisions 106,373 3,229 (1) 109,601 Corporate bonds 2,430 102 — 2,532 Asset backed securities 371,809 129 (6,913) 365,025 Total debt securities available for sale $ 946,751 $ 10,721 $ (7,334) $ 950,138 Debt Securities Held to Maturity Obligations of U.S. government agencies 361,785 6,072 (480) 367,377 Obligations of states and political subdivisions 13,821 327 — 14,148 Total debt securities held to maturity $ 375,606 $ 6,399 $ (480) $ 381,525 December 31, 2018 Amortized Gross Gross Estimated (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 647,288 $ 771 $ (18,078) $ 629,981 Obligations of states and political subdivisions 128,890 294 (3,112) 126,072 Corporate bonds 4,381 97 — 4,478 Asset backed securities 355,451 73 (1,019) 354,505 Total debt securities available for sale $ 1,136,010 $ 1,235 $ (22,209) $ 1,115,036 Debt Securities Held to Maturity Obligations of U.S. government agencies $ 430,343 $ 327 $ (7,745) $ 422,925 Obligations of states and political subdivisions 14,593 82 (230) 14,445 Total debt securities held to maturity $ 444,936 $ 409 $ (7,975) $ 437,370 During 2019, proceeds from sales of debt securities were $127,066,000, resulting in gross gains and gross (losses) of $338,000 and $(228,000), respectively. During 2018, proceeds from sales of debt securities were $293,279,000, resulting in a gross gains of $207,000. During 2017, investment securities with a cost basis of $24,796,000 were sold for $25,757,000, resulting in a gain of $961,000 on sale. Investment securities with an aggregate carrying value of $466,321,000 and $597,591,000 at December 31, 2019 and 2018, respectively, were pledged as collateral for specific borrowings, lines of credit and local agency deposits. The amortized cost and estimated fair value of debt securities at December 31, 2019 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. At December 31, 2019, obligations of U.S. government and agencies with an amortized cost basis totaling $827,924,000 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 December 31, 2019, the Company estimates the average remaining life of these mortgage-backed securities issued by U.S. government corporations and agencies to be approximately 4.9 years. Average remaining life is defined as the time span after which the principal balance has been reduced by half. Debt Securities Available for Sale Held to Maturity (In thousands) Amortized Estimated Amortized Estimated Due in one year $ 607 $ 611 $ 1,271 $ 1,280 Due after one year through five years 14,853 15,204 — — Due after five years through ten years 91,635 91,739 21,366 21,639 Due after ten years 839,656 842,584 352,969 358,606 Totals $ 946,751 $ 950,138 $ 375,606 $ 381,525 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 December 31, 2019 (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 36,709 $ (309) $ 23,852 $ (111) $ 60,561 $ (420) Obligations of states and political subdivisions 778 (1) — — 778 (1) Asset backed securities 237,463 (4,535) 99,981 (2,378) 337,444 (6,913) Total debt securities available for sale $ 274,950 $ (4,845) $ 123,833 $ (2,489) $ 398,783 $ (7,334) Debt Securities Held to Maturity Obligations of U.S. government agencies $ 18,813 $ (142) $ 62,952 $ (338) $ 81,765 $ (480) Obligations of states and political subdivisions — — — — — — Total debt securities held to maturity $ 18,813 $ (142) $ 62,952 $ (338) $ 81,765 $ (480) Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized December 31, 2018 (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 171,309 $ (3,588) $ 394,630 $ (14,490) $ 565,939 $ (18,078) Obligations of states and political subdivisions 63,738 (1,541) 20,719 (1,571) 84,457 (3,112) Asset backed securities 101,386 (1,019) — — 101,386 (1,019) Total securities available for sale $ 336,433 $ (6,148) $ 415,349 $ (16,061) $ 751,782 $ (22,209) Debt Securities Held to Maturity Obligations of U.S. government agencies $ 223,810 $ (2,619) $ 158,648 $ (5,126) $ 382,458 $ (7,745) Obligations of states and political subdivisions 5,786 (114) 4,042 (116) 9,828 (230) Total debt securities held to maturity $ 229,596 $ (2,733) $ 162,690 $ (5,242) $ 392,286 $ (7,975) Obligations of U.S. government corporations and agencies: Unrealized losses on investments in obligations of U.S. government corporations and agencies are caused by interest rate increases. The contractual cash flows of these securities are guaranteed by U.S. Government Sponsored Entities (principally Fannie Mae and Freddie Mac). It is expected that the securities would not be settled at a price less than the amortized cost of the investment. Because the decline in fair value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell and more likely than not will not be required to sell, these investments are not considered other-than-temporarily impaired. At December 31, 2019, 16 debt securities representing obligations of U.S. government corporations and agencies had unrealized losses with aggregate depreciation of 0.63% from the Company’s amortized cost basis. Obligations of states and political subdivisions: The unrealized losses on investments in obligations of states and political subdivisions were caused by increases in required yields by investors in these types of securities. It is expected that the securities would not be settled at a price less than the amortized cost of the investment. Because the decline in fair value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell and more likely than not will not be required to sell, these investments are not considered other-than-temporarily impaired. At December 31, 2019, 1 debt security representing obligations of states and political subdivisions had unrealized losses with aggregate depreciation of 0.13% from the Company’s amortized cost basis. Asset backed securities: The unrealized losses on investments in asset backed securities were caused by increases in required yields by investors in these types of securities. At the time of purchase, each of these securities were rated AA or AAA and through December 31, 2019 have not experienced any deterioration in credit rating. The Company continues to monitor these securities for changes in credit rating or other indications of credit deterioration. Because management believes the decline in fair value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell and more likely than not will not be required to sell, these investments are not considered other-than-temporarily impaired. At December 31, 2019, 20 asset backed securities had unrealized losses with aggregate depreciation of 2.01% from the Company’s amortized cost basis. Marketable equity securities: All unrealized gains recognized during the reporting period were for equity securities still held at December 31, 2019.

Loans

Loans	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Loans	Note 4 – Loans A summary of loan balances follows (in thousands): December 31, 2019 Originated PNCI PCI Total Mortgage loans on real estate: Residential 1-4 family $ 373,101 $ 134,994 $ 1,413 $ 509,508 Commercial 2,221,217 592,244 5,321 2,818,782 Total mortgage loans on real estate 2,594,318 727,238 6,734 3,328,290 Consumer: Home equity lines of credit 299,454 34,057 789 334,300 Home equity loans 25,343 2,829 414 28,586 Other 67,896 14,758 2 82,656 Total consumer loans 392,693 51,644 1,205 445,542 Commercial 262,581 18,649 2,477 283,707 Construction: Residential 191,681 11,285 — 202,966 Commercial 46,422 439 — 46,861 Total construction 238,103 11,724 — 249,827 Total loans, net of deferred loan fees and discounts $ 3,487,695 $ 809,255 $ 10,416 $ 4,307,366 Total principal balance of loans owed, net of charge-offs $ 3,496,622 $ 838,425 $ 16,678 $ 4,351,725 Unamortized net deferred loan fees (8,927) — — (8,927) Discounts to principal balance of loans owed, net of charge-offs — (29,170) (6,262) (35,432) Total loans, net of deferred loan fees and discounts $ 3,487,695 $ 809,255 $ 10,416 $ 4,307,366 Allowance for loan losses $ (30,110) $ (500) $ (6) $ (30,616) December 31, 2018 Originated PNCI PCI Total Mortgage loans on real estate: Residential 1-4 family $ 343,796 $ 169,792 $ 1,674 $ 515,262 Commercial 1,910,981 708,401 8,456 2,627,838 Total mortgage loan on real estate 2,254,777 878,193 10,130 3,143,100 Consumer: Home equity lines of credit 284,453 40,957 1,167 326,577 Home equity loans 32,660 3,585 439 36,684 Other 34,020 21,659 42 55,721 Total consumer loans 351,133 66,201 1,648 418,982 Commercial 228,635 45,468 2,445 276,548 Construction: Residential 90,703 30,593 — 121,296 Commercial 56,208 5,880 — 62,088 Total construction 146,911 36,473 — 183,384 Total loans, net of deferred loan fees and discounts $ 2,981,456 $ 1,026,335 $ 14,223 $ 4,022,014 Total principal balance of loans owed, net of charge-offs $ 2,991,324 $ 1,062,655 $ 21,265 $ 4,075,244 Unamortized net deferred loan fees (9,868) — — (9,868) Discounts to principal balance of loans owed, net of charge-offs — (36,320) (7,042) (43,362) Total loans, net of unamortized deferred loan fees and discounts $ 2,981,456 $ 1,026,335 $ 14,223 $ 4,022,014 Allowance for loan losses $ (31,793) $ (667) $ (122) $ (32,582) The following is a summary of the change in accretable yield for PCI loans during the periods indicated (in thousands): Year ended December 31, 2019 2018 2017 Change in accretable yield: Balance at beginning of period $ 6,059 $ 6,137 $ 7,670 Accretion to interest income (852) (787) (2,809) Reclassification from non-accretable difference 1,012 709 1,276 Balance at end of period $ 6,219 $ 6,059 $ 6,137

Allowance for Loan Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2019
Allowance For Loan And Lease Losses [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 - December 31, 2019 (in thousands) Beginning Charge-offs Recoveries Provision Ending Balance Mortgage loans on real estate: Residential 1-4 family $ 2,676 $ (2) $ 54 $ (422) $ 2,306 Commercial 12,944 (746) 1,528 (1,731) 11,995 Total mortgage loans on real estate 15,620 (748) 1,582 (2,153) 14,301 Consumer: Home equity lines of credit 6,042 — 504 (974) 5,572 Home equity loans 1,540 (3) 431 (1,357) 611 Other 793 (765) 321 1,246 1,595 Total consumer loans 8,375 (768) 1,256 (1,085) 7,778 Commercial 6,090 (2,123) 525 657 5,149 Construction: Residential 1,834 — — 1,236 3,070 Commercial 663 — — (345) 318 Total construction 2,497 — — 891 3,388 Total $ 32,582 $ (3,639) $ 3,363 $ (1,690) $ 30,616 Allowance for Loan Losses – As of December 31, 2019 (in thousands) Loans pooled Individually Loans acquired Total allowance Mortgage loans on real estate: Residential 1-4 family $ 2,257 $ 49 $ — $ 2,306 Commercial 11,917 78 — 11,995 Total mortgage loans on real estate 14,174 127 — 14,301 Consumer: Home equity lines of credit 5,451 115 6 5,572 Home equity loans 567 44 — 611 Other 1,576 19 — 1,595 Total consumer loans 7,594 178 6 7,778 Commercial 4,519 630 — 5,149 Construction: Residential 3,070 — — 3,070 Commercial 318 — — 318 Total construction 3,388 — — 3,388 Total $ 29,675 $ 935 $ 6 $ 30,616 Loans, Net of Unearned fees – As of December 31, 2019 (in thousands) Loans pooled Individually Loans acquired Total loans, net Mortgage loans on real estate: Residential 1-4 family $ 503,021 $ 5,074 $ 1,413 $ 509,508 Commercial 2,804,812 8,649 5,321 2,818,782 Total mortgage loans on real estate 3,307,833 13,723 6,734 3,328,290 Consumer: Home equity lines of credit 331,437 2,074 789 334,300 Home equity loans 26,522 1,650 414 28,586 Other 82,514 140 2 82,656 Total consumer loans 440,473 3,864 1,205 445,542 Commercial 278,900 2,330 2,477 283,707 Construction: Residential 202,966 — — 202,966 Commercial 46,861 — — 46,861 Total construction 249,827 — — 249,827 Total $ 4,277,033 $ 19,917 $ 10,416 $ 4,307,366 Allowance for Loan Losses – Year Ended December 31, 2018 (in thousands) Beginning Charge-offs Recoveries Provision Ending Balance Mortgage loans on real estate: Residential 1-4 family $ 2,317 $ (77) $ — $ 436 $ 2,676 Commercial 11,441 (15) 68 1,450 12,944 Total mortgage loans on real estate 13,758 (92) 68 1,886 15,620 Consumer: Home equity lines of credit 5,800 (277) 846 (327) 6,042 Home equity loans 1,841 (24) 297 (574) 1,540 Other 586 (783) 288 702 793 Total consumer loans 8,227 (1,084) 1,431 (199) 8,375 Commercial 6,512 (1,188) 541 225 6,090 Construction: Residential 1,184 — — 650 1,834 Commercial 642 — — 21 663 Total construction 1,826 — — 671 2,497 Total $ 30,323 $ (2,364) $ 2,040 $ 2,583 $ 32,582 Allowance for Loan Losses – As of December 31, 2018 (in thousands) Loans Individually Loans acquired Total allowance Mortgage loans on real estate: Residential 1-4 family $ 2,620 $ 56 $ — $ 2,676 Commercial 12,737 91 116 12,944 Total mortgage loans on real estate 15,357 147 116 15,620 Consumer: Home equity lines of credit 5,838 198 6 6,042 Home equity loans 1,486 54 — 1,540 Other 779 14 — 793 Total consumer loans 8,103 266 6 8,375 Commercial 4,309 1,781 — 6,090 Construction: Residential 1,834 — — 1,834 Commercial 663 — — 663 Total construction 2,497 — — 2,497 Total $ 30,266 $ 2,194 $ 122 $ 32,582 Loans, Net of Unearned fees – As of December 31, 2018 (in thousands) Loans Individually Loans acquired Total allowance Mortgage loans on real estate: Residential 1-4 family $ 509,267 $ 4,321 $ 1,674 $ 515,262 Commercial 2,606,819 12,563 8,456 2,627,838 Total mortgage loans on real estate 3,116,086 16,884 10,130 3,143,100 Consumer: Home equity lines of credit 322,764 2,646 1,167 326,577 Home equity loans 33,142 3,103 439 36,684 Other 55,483 196 42 55,721 Total consumer loans 411,389 5,945 1,648 418,982 Commercial 268,885 5,218 2,445 276,548 Construction: Residential 121,296 — — 121,296 Commercial 62,088 — — 62,088 Total construction 183,384 — — 183,384 Total $ 3,979,744 $ 28,047 $ 14,223 $ 4,022,014 Allowance for Loan Losses – Year Ended December 31, 2017 (in thousands) Beginning Charge-offs Recoveries Provision Ending Balance Mortgage loans on real estate: Residential 1-4 family $ 2,748 $ (60) $ — $ (371) $ 2,317 Commercial 11,517 (186) 397 (287) 11,441 Total mortgage loans on real estate 14,265 (246) 397 (658) 13,758 Consumer: Home equity lines of credit 7,044 (98) 698 (1,844) 5,800 Home equity loans 2,644 (332) 242 (713) 1,841 Other 622 (1,186) 375 775 586 Total consumer loans 10,310 (1,616) 1,315 (1,782) 8,227 Commercial 5,831 (1,444) 428 1,697 6,512 Construction: Residential 1,417 (1,104) — 871 1,184 Commercial 680 — 1 (39) 642 Total construction 2,097 (1,104) 1 832 1,826 Total $ 32,503 $ (4,410) $ 2,141 $ 89 $ 30,323 Allowance for Loan Losses – As of December 31, 2017 (in thousands) Loans Individually Loans acquired Total allowance Mortgage loans on real estate: Residential 1-4 family $ 1,932 $ 230 $ 155 $ 2,317 Commercial 11,351 30 60 11,441 Total mortgage loans on real estate 13,283 260 215 13,758 Consumer: Home equity lines of credit 5,356 427 17 5,800 Home equity loans 1,734 107 — 1,841 Other 529 57 — 586 Total consumer loans 7,619 591 17 8,227 Commercial 4,624 1,848 40 6,512 Construction: Residential 1,184 — — 1,184 Commercial 642 — — 642 Total construction 1,826 — — 1,826 Total $ 27,352 $ 2,699 $ 272 $ 30,323 Loans, Net of Unearned fees – As of December 31, 2017 (in thousands) Loans pooled Individually Loans acquired Total Loans Mortgage loans on real estate: Residential 1-4 family $ 378,743 $ 5,298 $ 1,385 $ 385,426 Commercial 1,892,422 13,911 8,563 1,914,896 Total mortgage loans on real estate 2,271,165 19,209 9,948 2,300,322 Consumer: Home equity lines of credit 283,502 2,688 2,498 288,688 Home equity loans 41,076 1,470 485 43,031 Other 24,853 257 45 25,155 Total consumer loans 349,431 4,415 3,028 356,874 Commercial 213,358 4,470 2,584 220,412 Construction: Residential 67,790 140 — 67,930 Commercial 69,627 — — 69,627 Total construction 137,417 140 — 137,557 Total $ 2,971,371 $ 28,234 $ 15,560 $ 3,015,165 As part of the on-going monitoring of the credit quality of the Company’s loan portfolio, management tracks certain credit quality indicators including, but not limited to, trends relating to (i) the level of criticized and classified loans, (ii) net charge-offs, (iii) non-performing loans, and (iv) delinquency within the portfolio. The Company utilizes a risk grading system to assign a risk grade to each of its loans. Loans are graded on a scale ranging from Pass to Loss. A description of the general characteristics of the risk grades is as follows: • Pass – This grade represents loans ranging from acceptable to very little or no credit risk. These loans typically meet most if not all policy standards in regard to: loan amount as a percentage of collateral value, debt service coverage, profitability, leverage, and working capital. • Special Mention – This grade represents “Other Assets Especially Mentioned” in accordance with regulatory guidelines and includes loans that display some potential weaknesses which, if left unaddressed, may result in deterioration of the repayment prospects for the asset or may inadequately protect the Company’s position in the future. These loans warrant more than normal supervision and attention. • Substandard – This grade represents “Substandard” loans in accordance with regulatory guidelines. Loans within this rating typically exhibit weaknesses that are well defined to the point that repayment is jeopardized. Loss potential is, however, not necessarily evident. The underlying collateral supporting the credit appears to have sufficient value to protect the Company from loss of principal and accrued interest, or the loan has been written down to the point where this is true. There is a definite need for a well-defined workout/rehabilitation program. • Doubtful – This grade represents “Doubtful” loans in accordance with regulatory guidelines. An asset classified as Doubtful has all the weaknesses inherent in a loan classified Substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Pending factors include proposed merger, acquisition, or liquidation procedures, capital injection, perfecting liens on additional collateral, and financing plans. • Loss – This grade represents “Loss” loans in accordance with regulatory guidelines. A loan classified as Loss is considered uncollectible and of such little value that its continuance as a bankable asset is not warranted. This classification does not mean that the loan has absolutely no recovery or salvage value, but rather that it is not practical or desirable to defer writing off the loan, even though some recovery may be affected in the future. The portion of the loan that is graded loss should be charged off no later than the end of the quarter in which the loss is identified. The following tables present ending loan balances by loan category and risk grade for the periods indicated: Credit Quality Indicators Originated Loans – As of December 31, 2019 (in thousands) Pass Special Substandard Doubtful / Loss Total Originated Mortgage loans on real estate: Residential 1-4 family $ 366,149 $ 2,497 $ 4,455 $ — $ 373,101 Commercial 2,185,961 24,485 10,771 — 2,221,217 Total mortgage loans on real estate 2,552,110 26,982 15,226 — 2,594,318 Consumer: Home equity lines of credit 293,432 3,332 2,690 — 299,454 Home equity loans 22,318 1,192 1,833 — 25,343 Other 67,422 373 101 — 67,896 Total consumer loans 383,172 4,897 4,624 — 392,693 Commercial 254,554 3,826 4,201 262,581 Construction: Residential 191,434 — 247 — 191,681 Commercial 46,105 317 — — 46,422 Total construction 237,539 317 247 — 238,103 Total loans $ 3,427,375 $ 36,022 $ 24,298 $ — $ 3,487,695 Credit Quality Indicators PNCI Loans – As of December 31, 2019 (in thousands) Pass Special Substandard Doubtful / Loss Total PNCI Mortgage loans on real estate: Residential 1-4 family $ 131,820 $ 2,217 $ 957 $ — $ 134,994 Commercial 584,829 573 6,842 — 592,244 Total mortgage loans on real estate 716,649 2,790 7,799 — 727,238 Consumer: Home equity lines of credit 32,096 857 1,104 — 34,057 Home equity loans 2,774 — 55 — 2,829 Other 14,390 346 22 — 14,758 Total consumer loans 49,260 1,203 1,181 — 51,644 Commercial 18,602 1 46 — 18,649 Construction: Residential 7,083 4,202 — — 11,285 Commercial 439 — — — 439 Total construction 7,522 4,202 — — 11,724 Total loans $ 792,033 $ 8,196 $ 9,026 $ — $ 809,255 Credit Quality Indicators Originated Loans – As of December 31, 2018 (in thousands) Pass Special Substandard Doubtful / Loss Total Originated Mortgage loans on real estate: Residential 1-4 family $ 337,189 $ 1,724 $ 4,883 $ — $ 343,796 Commercial 1,861,627 33,483 15,871 — 1,910,981 Total mortgage loans on real estate 2,198,816 35,207 20,754 — 2,254,777 Consumer: Home equity lines of credit 279,491 2,309 2,653 — 284,453 Home equity loans 29,289 1,054 2,317 — 32,660 Other 33,606 341 73 — 34,020 Total consumer loans 342,386 3,704 5,043 — 351,133 Commercial 217,126 6,127 5,382 — 228,635 Construction: Residential 90,412 32 259 — 90,703 Commercial 55,863 345 — — 56,208 Total construction 146,275 377 259 — 146,911 Total loans $ 2,904,603 $ 45,415 $ 31,438 $ — $ 2,981,456 Credit Quality Indicators PNCI Loans – As of December 31, 2018 (in thousands) Pass Special Substandard Doubtful / Loss Total PNCI Mortgage loans on real estate: Residential 1-4 family $ 167,908 $ 1,086 $ 798 $ — $ 169,792 Commercial 701,868 3,085 3,448 — 708,401 Total mortgage loans on real estate 869,776 4,171 4,246 — 878,193 Consumer: Home equity lines of credit 38,780 1,124 1,053 — 40,957 Home equity loans 3,413 74 98 — 3,585 Other 21,481 173 5 — 21,659 Total consumer loans 63,674 1,371 1,156 — 66,201 Commercial 45,027 321 120 — 45,468 Construction: Residential 30,593 — — — 30,593 Commercial 5,880 — — — 5,880 Total construction 36,473 — — — 36,473 Total $ 1,014,950 $ 5,863 $ 5,522 $ — $ 1,026,335 Consumer loans, whether unsecured or secured by real estate, automobiles, or other personal property, are susceptible to three primary risks; non-payment due to income loss, over-extension of credit and, when the borrower is unable to pay, shortfall in collateral value. Typically non-payment is due to loss of job and will follow general economic trends in the marketplace driven primarily by rises in the unemployment rate. Loss of collateral value can be due to market demand shifts, damage to collateral itself or a combination of the two. Problem consumer loans are generally identified by payment history of the borrower (delinquency). The Bank manages its consumer loan portfolios by monitoring delinquency and contacting borrowers to encourage repayment, suggest modifications if appropriate, and, when continued scheduled payments become unrealistic, initiate repossession or foreclosure through appropriate channels. Collateral values may be determined by appraisals obtained through Bank approved, licensed appraisers, qualified independent third parties, public value information (blue book values for autos), sales invoices, or other appropriate means. Appropriate valuations are obtained at initiation of the credit and periodically (every 3-12 months depending on collateral type) once repayment is questionable and the loan has been classified. Commercial real estate loans generally fall into two categories, owner-occupied and non-owner occupied. Loans secured by owner occupied real estate are primarily susceptible to changes in the business conditions of the related business. This may be driven by, among other things, industry changes, geographic business changes, changes in the individual fortunes of the business owner, and general economic conditions and changes in business cycles. These same risks apply to commercial loans whether secured by equipment or other personal property or unsecured. Losses on loans secured by owner occupied real estate, equipment, or other personal property generally are dictated by the value of underlying collateral at the time of default and liquidation of the collateral. When default is driven by issues related specifically to the business owner, collateral values tend to provide better repayment support and may result in little or no loss. Alternatively, when default is driven by more general economic conditions, underlying collateral generally has devalued more and results in larger losses due to default. Loans secured by non-owner occupied real estate are primarily susceptible to risks associated with swings in occupancy or vacancy and related shifts in lease rates, rental rates or room rates. Most often these shifts are a result of changes in general economic or market conditions or overbuilding and resultant over-supply. Losses are dependent on value of underlying collateral at the time of default. Values are generally driven by these same factors and influenced by interest rates and required rates of return as well as changes in occupancy costs. Construction loans, whether owner occupied or non-owner occupied commercial real estate loans or residential development loans, are not only susceptible to the related risks described above but the added risks of construction itself including cost over-runs, mismanagement of the project, or lack of demand or market changes experienced at time of completion. Again, losses are primarily related to underlying collateral value and changes therein as described above. Problem C&I loans are generally identified by periodic review of financial information which may include financial statements, tax returns, rent rolls and payment history of the borrower (delinquency). Based on this information the Bank may decide to take any of several courses of action including demand for repayment, additional collateral or guarantors, and, when repayment becomes unlikely through borrower’s income and cash flow, repossession or foreclosure of the underlying collateral. Collateral values may be determined by appraisals obtained through Bank approved, licensed appraisers, qualified independent third parties, public value information (blue book values for autos), sales invoices, or other appropriate means. Appropriate valuations are obtained at initiation of the credit and periodically (every 3-12 months depending on collateral type) once repayment is questionable and the loan has been classified. Once a loan becomes delinquent and repayment becomes questionable, a Bank collection officer will address collateral shortfalls with the borrower and attempt to obtain additional collateral. If this is not forthcoming and payment in full is unlikely, the Bank will estimate its probable loss, using a recent valuation as appropriate to the underlying collateral less estimated costs of sale, and charge the loan down to the estimated net realizable amount. Depending on the length of time until ultimate collection, the Bank may revalue the underlying collateral and take additional charge-offs as warranted. Revaluations may occur as often as every 3-12 months depending on the underlying collateral and volatility of values. Final charge-offs or recoveries are taken when collateral is liquidated and actual loss is known. Unpaid balances on loans after or during collection and liquidation may also be pursued through lawsuit and attachment of wages or judgment liens on borrower’s other assets. The following tables show the ending balance of current and past due originated and PNCI loans by loan category as of the date indicated: Analysis of Originated Past Due Loans - As of December 31, 2019 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 60 $ 65 $ 1,957 $ 2,082 $ 371,019 $ 373,101 $ — Commercial 30 136 293 459 2,220,758 2,221,217 — Total mortgage loans on real estate 90 201 2,250 2,541 2,591,777 2,594,318 — Consumer: Home equity lines of credit — 93 712 805 298,649 299,454 — Home equity loans 36 216 132 384 24,959 25,343 — Other 120 — 4 124 67,772 67,896 — Total consumer loans 156 309 848 1,313 391,380 392,693 — Commercial 604 297 9 910 261,671 262,581 — Construction: Residential — — — — 191,681 191,681 — Commercial — — — — 46,422 46,422 — Total construction — — — — 238,103 238,103 — Total originated loans $ 850 $ 807 $ 3,107 $ 4,764 $ 3,482,931 $ 3,487,695 $ — Analysis of PNCI Past Due Loans - As of December 31, 2019 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ — $ 305 $ — $ 305 $ 134,689 $ 134,994 $ — Commercial 268 — 2,137 2,405 589,839 592,244 — Total mortgage loans on real estate 268 305 2,137 2,710 724,528 727,238 — Consumer: Home equity lines of credit 87 260 243 590 33,467 34,057 — Home equity loans 51 — — 51 2,778 2,829 — Other — — 19 19 14,739 14,758 19 Total consumer loans 138 260 262 660 50,984 51,644 19 Commercial — — 51 51 18,598 18,649 — Construction: Residential — — — — 11,285 11,285 — Commercial — — — — 439 439 — Total construction — — — — 11,724 11,724 — Total PNCI loans $ 406 $ 565 $ 2,450 $ 3,421 $ 805,834 $ 809,255 $ 19 Analysis of Originated Past Due Loans - As of December 31, 2018 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 1,675 $ 132 $ 478 $ 2,285 $ 341,511 $ 343,796 $ — Commercial 431 1,200 296 1,927 1,909,054 1,910,981 — Total mortgage loans on real estate 2,106 1,332 774 4,212 2,250,565 2,254,777 — Consumer: Home equity lines of credit 908 47 609 1,564 282,889 284,453 — Home equity loans 1,043 24 214 1,281 31,379 32,660 — Other 298 17 — 315 33,705 34,020 — Total consumer loans 2,249 88 823 3,160 347,973 351,133 — Commercial 1,053 579 1,247 2,879 225,756 228,635 — Construction: Residential 209 — — 209 90,494 90,703 — Commercial — — — — 56,208 56,208 — Total construction 209 — — 209 146,702 146,911 — Total loans $ 5,617 $ 1,999 $ 2,844 $ 10,460 $ 2,970,996 $ 2,981,456 $ — Analysis of PNCI Past Due Loans - As of December 31, 2018 (in thousands) 30-59 60-89 > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 1,009 $ 133 $ 156 $ 1,298 $ 168,494 $ 169,792 $ — Commercial 1,646 1,136 1,082 3,864 704,537 708,401 — Total mortgage loans on real estate 2,655 1,269 1,238 5,162 873,031 878,193 — Consumer: Home equity lines of credit 304 35 237 576 40,381 40,957 — Home equity loans 74 — — 74 3,511 3,585 — Other 160 — — 160 21,499 21,659 — Total consumer loans 538 35 237 810 65,391 66,201 — Commercial 678 145 113 936 44,532 45,468 — Construction: Residential — — — — 30,593 30,593 — Commercial — — — — 5,880 5,880 — Total construction — — — — 36,473 36,473 — Total loans $ 3,871 $ 1,449 $ 1,588 $ 6,908 $ 1,019,427 $ 1,026,335 $ — The following table shows the ending balance of non accrual loans by loan category as of the date indicated: Non Accrual Loans As of December 31, 2019 As of December 31, 2018 (in thousands) Originated PNCI Total Originated PNCI Total Mortgage loans on real estate: Residential 1-4 family $ 3,547 $ 876 $ 4,423 $ 3,244 $ 334 $ 3,578 Commercial 2,702 2,403 5,105 9,263 1,468 10,731 Total mortgage loans on real estate 6,249 3,279 9,528 12,507 1,802 14,309 Consumer: Home equity lines of credit 1,254 548 1,802 1,429 885 2,314 Home equity loans 1,181 31 1,212 1,722 47 1,769 Other 29 2 31 3 4 7 Total consumer loans 2,464 581 3,045 3,154 936 4,090 Commercial 2,038 51 2,089 3,755 120 3,875 Construction: Residential — — — — — — Commercial — — — — — — Total construction — — — — — — Total non accrual loans $ 10,751 $ 3,911 $ 14,662 $ 19,416 $ 2,858 $ 22,274 Interest income on originated non accrual loans that would have been recognized during the years ended December 31, 2019, 2018, and 2017, if all such loans had been current in accordance with their original terms, totaled $896,000, $1,584,000, and $1,067,000, respectively. Interest income actually recognized on these originated loans during the years ended December 31, 2019, 2018, and 2017 was $210,000, $486,000, and $530,000, respectively. Interest income on PNCI non accrual loans that would have been recognized during the years ended December 31, 2019, 2018, and 2017, if all such loans had been current in accordance with their original terms, totaled $305,000, $1,122,000, and $73,000, respectively. Interest income actually recognized on these PNCI loans during the years ended December 31, 2019, 2018, and 2017 was $162,000, $989,000, and $18,000, respectively. Impaired originated loans are those where management has concluded that it is probable that the borrower will be unable to pay all amounts due under the contractual terms. The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired Originated and PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated. Impaired Originated Loans - As of, or for the Twelve Months Ended, December 31, 2019 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 4,836 $ 3,434 $ 764 $ 4,198 $ 49 $ 4,388 $ 71 Commercial 6,543 4,401 1,845 6,246 78 9,343 86 Total mortgage loans on real estate 11,379 7,835 2,609 10,444 127 13,731 157 Consumer: Home equity lines of credit 1,315 1,267 1 1,268 1 1,679 35 Home equity loans 1,895 1,278 234 1,512 42 1,839 5 Other 47 3 25 28 7 33 2 Total consumer loans 3,257 2,548 260 2,808 50 3,551 42 Commercial 2,612 1,463 816 2,279 579 3,746 12 Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 17,248 $ 11,846 $ 3,685 $ 15,531 $ 756 $ 21,028 $ 211 Impaired PNCI Loans - As of, or for the Twelve Months Ended, December 31, 2019 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 945 $ 876 $ — $ 876 $ — $ 605 $ 9 Commercial 2,405 2,403 — 2,403 — 1,935 146 Total mortgage loans on real estate 3,350 3,279 — 3,279 — 2,540 155 Consumer: Home equity lines of credit 862 395 411 806 114 905 6 Home equity loans 159 20 118 138 2 189 — Other 112 59 53 112 12 111 — Total consumer loans 1,133 474 582 1,056 128 1,205 6 Commercial 59 — 51 51 51 86 — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 4,542 $ 3,753 $ 633 $ 4,386 $ 179 $ 3,831 $ 161 Impaired Originated Loans - As of, or for the Twelve Months Ended, December 31, 2018 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 4,594 $ 3,663 $ 308 $ 3,971 $ 56 $ 3,517 $ 90 Commercial 13,081 10,676 1,765 12,441 42 13,115 137 Total mortgage loans on real estate 17,675 14,339 2,073 16,412 98 16,632 227 Consumer: Home equity lines of credit 1,900 1,749 111 1,860 71 1,885 43 Home equity loans 2,374 1,892 65 1,957 2 1,520 23 Other 3 — 3 3 3 17 2 Total consumer loans 4,277 3,641 179 3,820 76 3,422 68 Commercial 5,433 2,924 2,287 5,211 1,774 4,654 91 Construction: Residential — — — — — 5 — Commercial — — — — — — — Total construction — — — — — 5 — Total $ 27,385 $ 20,904 $ 4,539 $ 25,443 $ 1,948 $ 24,713 $ 386 Impaired PNCI Loans - As of, or for the Twelve Months Ended, December 31, 2018 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 375 $ 334 $ — $ 334 $ — $ 529 $ 5 Commercial 3,110 1,468 — 1,468 — 1,713 183 Total mortgage loans on real estate 3,485 1,802 — 1,802 — 2,242 188 Consumer: Home equity lines of credit 1,027 587 367 954 127 1,120 18 Home equity loans 252 47 197 244 101 155 — Other 106 21 85 106 11 114 — Total consumer loans 1,385 655 649 1,304 239 1,389 18 Commercial 120 113 7 120 7 60 1 Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 4,990 $ 2,570 $ 656 $ 3,226 $ 246 $ 3,691 $ 207 Impaired Originated Loans - As of, or for the Twelve Months Ended, December 31, 2017 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 4,023 $ 2,058 $ 1,881 $ 3,939 $ 230 $ 3,501 $ 143 Commercial 14,186 13,101 810 13,911 30 13,851 645 Total mortgage loans on real estate 18,209 15,159 2,691 17,850 260 17,352 788 Consumer: Home equity lines of credit 1,581 1,093 401 1,494 111 1,702 47 Home equity loans 1,627 1,107 198 1,305 10 1,193 24 Other 55 4 3 7 3 20 — Total consumer loans 3,263 2,204 602 2,806 124 2,915 71 Commercial 4,566 575 3,895 4,470 1,848 4,283 184 Construction: Residential 140 140 — 140 — 76 9 Commercial — — — — — — — Total construction 140 140 — 140 — 76 9 Total $ 26,178 $ 18,078 $ 7,188 $ 25,266 $ 2,232 $ 24,626 $ 1,052 Impaired PNCI Loans - As of, or for the Twelve Months Ended, December 31, 2017 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 1,404 $ 1,359 $ — $ 1,359 $ — $ 1,041 $ 24 Commercial — — — — — 979 — Total mortgage loans on real estate 1,404 1,359 — 1,359 — 2,020 24 Consumer: Home equity lines of credit 1,216 591 603 1,194 316 1,240 48 Home equity loans 178 44 121 165 97 117 6 Other 250 — 250 250 54 186 11 Total consumer loans 1,644 635 974 1,609 467 1,543 65 Commercial — — — — — — — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 3,048 $ 1,994 $ 974 $ 2,968 $ 467 $ 3,563 $ 89 Originated loans classified as TDRs and impaired were $7,285,000, $10,253,000 and $12,517,000 at December 31, 2019, 2018 and 2017, respectively. PNCI loans classified as TDRs and impaired were $726,000, $615,000 and $1,352,000 at December 31, 2019, 2018 and 2017, respectively. The Company had no significant obligations to lend additional funds on Originated or PNCI TDRs as of December 31, 2019, 2018, or 2017. The following tables show certain information regarding Troubled Debt Restructurings that occurred during the periods indicated: TDR Information for the Year Ended December 31, 2019 (dollars in thousands) Number Pre-mod Post-mod Financial Number that Recorded Financial impact Mortgage loans on real estate: Residential 1-4 family 3 $ 659 $ 662 $ 30 — $ — $ — Commercial 2 60 67 — — — — Total mortgage loans on real estate 5 719 729 30 — — — Consumer: Home equity lines of credit 1 65 68 — — — — Home equity loans 2 149 147 29 — — — Other — — — — — — — Total consumer loans 3 214 215 29 — — — Commercial 10 1,918 1,885 — 1 7 — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total 18 $ 2,851 $ 2,829 $ 59 1 $ 7 $ — TDR Information for the Year Ended December 31, 2018 (dollars in thousands) Number Pre-mod Post-mod Financial Number that Recorded Financial impact Mortgage loans on real estate: Residential 1-4 family 1 $ 156 $ 156 $ — — $ — $ — Commercial 7 1,782 1,779 491 1 169 — Total mortgage loans on real estate 8 1,938 1,935 491 1 169 — Consumer: Home equity lines of credit 1 133 138 — 2 248 — Home equity loans 2 599 599 (35) — — — Other — — — — — — — Total consumer loans 3 732 737 (35) 2 248 — Commercial 6 1,098 1,083 325 3 148 — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total 17 $ 3,768 $ 3,755 $ 781 6 $ 565 $ — TDR Information for the Year Ended December 31, 2017 (dollars in thousands) Number Pre-mod Post-mod Financial Number that Recorded Financial impact Mortgage loans on real estate: Residential 1-4 family 1 $ 939 $ 939 $ 169 2 $ 223 $ — Commercial 8 3,721 3,695 (111) 1 219 — Total mortgage loans on real estate 9 4,660 4,634 58 3 442 — Consumer: Home equity lines of credit 3 187 187 27 1 127 (5) Home equity loans 1 252 252 — 1 55 — Other 1 14 14 11 — — — Total consumer loans 5 453 453 38 2 182 (5) Commercial 11 1,854 1,747 37 — Construction: Residential 1 144 144 — — — — Commercial — — — — — — — Total construction 1 144 144 — — — — Total 26 $ 7,111 $ 6,978 $ 133 5 $ 624 $ (5) 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.

Real Estate Owned

Real Estate Owned	12 Months Ended
	Dec. 31, 2019
Repossessed Assets [Abstract]
Foreclosed Assets	Note 6 – Real Estate Owned A summary of the activity in the balance of real estate owned follows (dollars in thousands): Year ended December 31, 2019 2018 Beginning balance, net $ 2,280 $ 3,226 Additions/transfers from loans 1,249 1,262 Dispositions/sales (1,090) (2,119) Valuation adjustments 102 (89) Ending balance, net $ 2,541 $ 2,280 Ending valuation allowance $ (139) $ (116) Ending number of foreclosed assets 6 11 Proceeds from sale of real estate owned $ 1,336 $ 2,527 Gain on sale of real estate owned $ 246 $ 408 At December 31, 2019, the balance of real estate owned includes $1,048,000 of foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property. At December 31, 2019, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are underway is $39,000.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Premises and Equipment	Note 7 – Premises and Equipment As of December 31, 2019 2018 (In thousands) Land and land improvements $ 29,453 $ 29,065 Buildings 65,241 64,478 Furniture and equipment 45,723 45,228 140,417 138,771 Less: Accumulated depreciation (53,704) (50,125) 86,713 88,646 Construction in progress 373 701 Total premises and equipment $ 87,086 $ 89,347 Depreciation expense for premises and equipment amounted to $6,472,000, $6,104,000, and $5,686,000 in 2019, 2018, and 2017, respectively.

Cash Value of Life Insurance

Cash Value of Life Insurance	12 Months Ended
	Dec. 31, 2019
Cash Value of Life Insurance [Abstract]
Cash Value of Life Insurance	Note 8 – Cash Value of Life Insurance A summary of the activity in the balance of cash value of life insurance follows (dollars in thousands): Year ended December 31, 2019 2018 Beginning balance $ 117,318 $ 97,783 Acquired policies from business combination — 16,817 Increase in cash value of life insurance 3,029 2,718 Gain on death benefit 831 — Insurance proceeds receivable reclassified to other assets (3,355) — Ending balance $ 117,823 $ 117,318 End of period death benefit $ 199,084 $ 200,249 Number of policies owned 189 196 Insurance companies used 14 14 Current and former employees and directors covered 63 66

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2019
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: (in thousands) December 31, Additions Reductions December 31, Goodwill $ 220,872 $ — $ (100) $ 220,972 Impairment exists when a Company’s carrying value exceeds its fair value. Goodwill is evaluated for impairment annually. At September 30, 2019, the Company had positive equity and the Company elected to perform a qualitative assessment to determine if it was more likely than not that the fair value of the Company exceeded its carrying value, including goodwill. The qualitative assessment indicated that it was more likely than not that the fair value of the reporting unit exceeds its carrying value, resulting in no impairment. For each of the years in the three year period ended December 31, 2019, there were no impairment charges recognized. Reductions in goodwill recorded during the year ended December 31, 2019 were the result of management's refinement of the purchase accounting valuation estimates of certain assets and liabilities associated with the acquisition of FNBB. The following table summarizes the Company’s core deposit intangibles (“CDI”) as of the dates indicated: (in thousands) December 31, Additions Reductions/ December 31, Core deposit intangibles $ 37,163 $ — $ — $ 37,163 Accumulated amortization (13,606) — (5,723) (7,883) Core deposit intangibles, net $ 23,557 — $ (5,723) $ 29,280 The Company recorded additions to its CDI of $27,605,000 in conjunction with the FNBB acquisition on July 6, 2018, $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, and $898,000 in conjunction with the Citizens acquisition on September 23, 2011. The following table summarizes the Company’s estimated core deposit intangible amortization (dollars in thousands): Years Ended Estimated CDI Amortization 2020 $ 5,723 2021 5,465 2022 4,776 2023 4,269 2024 2,482 Thereafter 842 $ 23,557

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2019
Mortgage Servicing Right [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 for the periods indicated (dollars in thousands): Year ended December 31, 2019 2018 2017 Balance at beginning of period $ 7,098 $ 6,687 $ 6,595 Additions 913 557 810 Change in fair value (1,811) (146) (718) Balance at end of period $ 6,200 $ 7,098 $ 6,687 Contractually specified servicing fees, late fees and ancillary fees earned $ 1,917 $ 2,038 $ 2,076 Balance of loans serviced at: Beginning of period $ 785,138 $ 811,065 $ 816,623 End of period $ 767,662 $ 785,138 $ 811,065 Period end: Weighted-average prepayment speed (CPR) 6.2 % 7.6 % 8.9 % Weighted-average discount rate 12.0 % 12.0 % 13.0 % The changes in fair value of MSRs during 2019 were primarily due to changes in principal balances and mortgage prepayment speeds of the MSRs. The changes in fair value of MSRs during 2018 were primarily due to changes in investor required rate of return, or discount rate, of the MSRs. The changes in fair value of MSRs during 2017 were primarily 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.

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	Leases The following table presents the components of lease expense for the period indicated (in thousands): Year ended December 31, 2019 Operating lease cost $ 5,228 Short-term lease cost 262 Variable lease cost (29) Sublease income (131) Total lease cost $ 5,330 Prior to the adoption of ASU 2016-2, rent expense under operating leases was $6,348,000 and $5,885,000 for years ended 2018 and 2017, respectively. Rent expense was offset by rent income of $42,000 and $44,000 during the same periods, respectively. The following table presents supplemental cash flow information related to leases for the twelve months ended December 31, 2019 (in thousands): Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 4,931 ROUA obtained in exchange for operating lease liabilities $ 32,162 The following table presents the weighted average operating lease term and discount rate at December 31, 2019: Weighted-average remaining lease term 9.3 years Weighted-average discount rate 3.2 % At December 31, 2019, future expected operating lease payments are as follows (in thousands): Periods ending December 31, 2020 $ 4,388 2021 4,235 2022 3,896 2023 3,216 2024 2,937 Thereafter 13,745 32,417 Discount for present value of expected cash flows (4,877) Lease liability at December 31, 2019 $ 27,540

Deposits

Deposits	12 Months Ended
	Dec. 31, 2019
Deposits [Abstract]
Deposits	Note 12 – Deposits A summary of the balances of deposits follows (in thousands): December 31, 2019 2018 Noninterest-bearing demand $ 1,832,665 $ 1,760,580 Interest-bearing demand 1,242,274 1,252,366 Savings 1,851,549 1,921,324 Time certificates, $250,000 and over 129,061 132,429 Other time certificates 311,445 299,767 Total deposits $ 5,366,994 $ 5,366,466 Certificate of deposit balances of $30,000,000 and $60,000,000 from the State of California were included in time certificates over $250,000 at December 31, 2019 and 2018. The Bank participates in a deposit program offered by the State of California whereby the State may make deposits at the Bank’s request subject to collateral and credit worthiness constraints. The negotiated rates on these State deposits are generally more favorable than other wholesale funding sources available to the Bank. Overdrawn deposit balances of $1,550,000 and $1,469,000 were classified as consumer loans at December 31, 2019 and 2018, respectively. At December 31, 2019, the scheduled maturities of time deposits were as follows (in thousands): Scheduled 2020 $ 340,150 2021 57,076 2022 38,552 2023 2,798 2024 1,924 Thereafter 6 Total $ 440,506

Other Borrowings

Other Borrowings	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Other Borrowings	Note 13 – Other Borrowings A summary of the balances of other borrowings follows: December 31, 2019 2018 (in thousands) Other collateralized borrowings, fixed rate, as of December 31, 2019 and 2018 of 0.05%, payable on January 2, 2020 and 2019, respectively $ 18,454 $ 15,839 Total other borrowings $ 18,454 $ 15,839 Other collateralized borrowings are generally overnight maturity borrowings from non-financial institutions that are collateralized by securities owned by the Company. As of December 31, 2019, the Company has pledged as collateral and sold under agreements to repurchase investment securities with fair value of $48,878,000 under these other collateralized borrowings. The Company maintains a collateralized line of credit with the FHLB. Based on the FHLB stock requirements at December 31, 2019, this line provided for maximum borrowings of $2,257,336,000 of which zero was outstanding. As of December 31, 2019, the Company had designated investment securities with a fair value of $160,134,000 and loans totaling $3,070,793,000 as potential collateral under this collateralized line of credit with the FHLB. The Company maintains a collateralized line of credit with the Federal Reserve Bank of San Francisco (“FRB”). As of December 31, 2019, this line provided for maximum borrowings of $273,395,000 of which none was outstanding. As of December 31, 2019, the Company has designated investment securities with fair value of $10,000 and loans totaling $273,385,000 as potential collateral under this collateralized line of credit with the FRB. The Company has available unused correspondent banking lines of credit from commercial banks totaling $60,000,000 for federal funds transactions at December 31, 2019.

Junior Subordinated Debt

Junior Subordinated Debt	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Junior Subordinated Debt	Note 14 – Junior Subordinated Debt At December 31, 2019, 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 in 2014. The acquired Debentures were recorded on the Company’s books at their fair values on the acquisition date. The related fair value discounts to face value of these Debentures will be amortized over the remaining period in which their values are fully allowed to be included in the Company's capital ratio calculations using the effective interest method. 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 will continue to qualify as Tier 1 or Tier 2 capital under interim guidance issued by the Board of Governors of the Federal Reserve System until only five years remain until their scheduled maturity. 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 December 31, 2019 December 31, 2018 Subordinated Debt Series Maturity Face Current Recorded Recorded TriCo Cap Trust I 10/7/2033 $ 20,619 3.05 % 5.04 % $ 20,619 $ 20,619 TriCo Cap Trust II 7/23/2034 20,619 2.55 % 4.48 % 20,619 20,619 North Valley Trust II 4/24/2033 6,186 3.25 % 5.16 % 5,215 5,174 North Valley Trust III 4/24/2034 5,155 2.80 % 4.73 % 4,118 4,079 North Valley Trust IV 3/15/2036 10,310 1.33 % 3.22 % 6,661 6,551 $ 62,889 $ 57,232 $ 57,042

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 15 – Commitments and Contingencies Restricted Cash Balances — Reserves (in the form of deposits with the San Francisco Federal Reserve Bank) of $136,370,000 and $119,317,000 were maintained to satisfy Federal regulatory requirements at December 31, 2019 and 2018. These reserves are included in cash and due from banks in the accompanying consolidated balance sheets. Financial Instruments with Off-Balance-Sheet Risk — The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, standby letters of credit, and deposit account overdraft privilege. Those instruments involve, to varying degrees, elements of risk in excess of the amount recognized in the balance sheet. The contract amounts of those instruments reflect the extent of involvement the Company has in particular classes of financial instruments. The Company’s exposure to loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit written is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. The Company’s exposure to loss in the event of nonperformance by the other party to the financial instrument for deposit account overdraft privilege is represented by the overdraft privilege amount disclosed to the deposit account holder. The following table presents a summary of the Bank’s commitments and contingent liabilities: December 31, (in thousands) 2019 2018 Financial instruments whose amounts represent risk: Commitments to extend credit: Commercial loans $ 363,793 $ 306,191 Consumer loans 533,576 496,575 Real estate mortgage loans 188,959 140,292 Real estate construction loans 222,998 248,996 Standby letters of credit 12,014 11,346 Deposit account overdraft privilege 110,402 111,956 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates of one year or less or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on Management’s credit evaluation of the customer. Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, residential properties, and income-producing commercial properties. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support private borrowing arrangements. Most standby letters of credit are issued for one year or less. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. Collateral requirements vary, but in general follow the requirements for other loan facilities. Deposit account overdraft privilege amount represents the unused overdraft privilege balance available to the Company’s deposit account holders who have deposit accounts covered by an overdraft privilege. The Company has established an overdraft privilege for certain of its deposit account products whereby all holders of such accounts who bring their accounts to a positive balance at least once every thirty days receive the overdraft privilege. The overdraft privilege allows depositors to overdraft their deposit account up to a predetermined level. The predetermined overdraft limit is set by the Company based on account type. Legal Proceedings — 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 Company has entered into employment agreements or change of control agreements with certain officers of the Company providing severance payments and accelerated vesting of benefits under supplemental retirement agreements to the officers in the event of a change in control of the Company and termination for other than cause or after a substantial and material change in the officer’s title, compensation or responsibilities. 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 1.6228 per Class B share. As of December 31, 2019, the value of the Class A shares was $187.90 per share. Utilizing the conversion ratio, the value of unredeemed Class A equivalent shares owned by the Bank was $4,085,000 as of December 31, 2019, and has not been reflected in the accompanying consolidated 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	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Shareholders' Equity	Note 16 – Shareholders’ Equity Dividends Paid The Bank paid to the Company cash dividends in the aggregate amounts of $32,669,000, $26,432,000, and $19,236,000 in 2019, 2018, and 2017, 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, 2019, the Bank could have paid dividends of $131,000,000 to the Company without the approval of the Commissioner of the Department of Business Oversight. Stock Repurchase Plan On November 12, 2019 the Board of Directors approved the authorization to repurchase up to 1,525,000 shares of the Company's common stock (the 2019 Repurchase Plan), which approximates 5.0% of the shares outstanding as of the approval date. The actual timing of any share repurchases will be determined by the Company's management and therefore the total value of the shares to be purchased under the program is subject to change. The 2019 Repurchase Plan has no expiration date and as of and for year ended December 31, 2019, the Company has repurchased no shares. In connection with approval of the 2019 Repurchase Plan, the Company’s previous repurchase program adopted on August 21, 2007 (the 2007 Repurchase Plan) was terminated. Under the 2007 Repurchase Plan, as of December 31, 2018, the Company had repurchased 196,566 total shares and during the year ended December 31, 2018, there were 26,966 shares of common stock with a fair value of $968,000 repurchased under this plan. There were no shares of common stock repurchased under the 2007 Repurchase Plan during 2019 or 2017. Stock Repurchased Under Equity Compensation Plans The Company's shareholder-approved equity compensation plans permit employees to tender recently vested shares in lieu of cash for the payment of withholding taxes on such shares. During the years ended December 31, 2019, 2018, and 2017, employees tendered 115,954, 59,025, and 92,410 shares, respectively, of the Company's common stock in connection with option exercises. Employees also tendered 15,242, 45,964 and 14,980 shares in connection with other share based awards during December 31, 2019, 2018 and 2017, respectively. In total, shares of the Company's common stock tendered had market values of $5,108,000, $3,001,000, and $3,854,000 for the years ended December 31, 2019, 2018 and 2017, respectively. The tendered shares were retired. The market value of tendered shares is the last market trade price at closing on the day an option is exercised or the other share based award vests. Stock repurchased under equity incentive plans are not included in the total of stock repurchased under the 2019 or 2007 Repurchase Plans.

Stock Options and Other Equity-

Stock Options and Other Equity-Based Incentive Instruments	12 Months Ended
	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options and Other Equity-Based Incentive Instruments	Note 17 – Stock Options and Other Equity-Based Incentive Instruments In April 2019, the Company’s Board of Directors adopted the TriCo Bancshares 2019 Equity Incentive Plan (2019 Plan) covering officers, employees, directors of, and consultants to, the Company. The 2019 Plan was approved by the Company’s shareholders in May 2019. The 2019 Plan allows the Company to issue equity-based incentives representing up to 1,500,000 shares, such as incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units and performance awards (which could either be restricted stock or restricted stock units) (collectively, Awards). The 2019 Plan contains several enhanced corporate governance provisions, including: expressly providing that executives’ Awards and cash incentive compensation are subject to TriCo’s potential clawback or recoupment if the Company must restate its financial statements; generally imposing a one year minimum vesting period on Awards; generally requiring participants to hold at least 50% of the shares acquired under an Award for at least one year; and clarifying that credit for dividends declared on shares of common stock underlying an Award is subject to the same vesting requirements as the common stock underlying the Award. The number of shares available for issuance under the 2019 Plan will be reduced by: (i) one share for each share of common stock issued pursuant to a stock option; (ii) the total number of stock appreciation rights that are exercised, including any shares of common stock underlying such Awards that are not actually issued to the participant as the result of a net settlement; (iii) two shares for each share of common stock issued pursuant to a performance award, a restricted share Award or an RSU Award and (iv) any shares of common stock used to pay any exercise price or tax withholding obligation with respect to any Award. When Awards made under the 2019 Plan expire or are forfeited or cancelled, the underlying shares will become available for future Awards under the 2019 Plan. To the extent that a share of common stock pursuant to an Award that counted as two shares again becomes available for issuance under the 2019 Plan, the number of shares of common stock available for issuance under the 2019 Plan will increase by two shares. If shares of common stock issued pursuant to the Plan are repurchased by, or are surrendered or forfeited to the Company at no more than cost, then such shares will again be available for the grant of Awards under the Plan. Any shares of common stock repurchased by the Company with cash proceeds from the exercise of options will not, however, be added back to the pool of share available for issuance under the 2019 Plan. Shares awarded and delivered under the 2019 Plan may be authorized but unissued shares or reacquired shares. Shares tendered to TriCo or withheld from delivery to a participant as payment of the exercise price or in connection with the “net exercise” of a stock option or to satisfy TriCo’s tax withholding obligations will not again become available for future Awards under the 2019 Plan. As of December 31, 2019, there were no outstanding options for the purchase of common shares and 59,162 RSUs were outstanding, and 1,315,537 shares remain available for issuance. The 2019 Plan replaced the TriCo Bancshares 2009 Equity Incentive Plan (2009 Plan), which expired on March 26, 2019. As a result of its expiration, no further awards may be issued under the 2009 Plan, though all awards under the 2009 Plan that were outstanding as of its expiration continue to be governed by the terms, conditions and procedures set forth in the 2009 Plan and any applicable award agreement. There were no new grants issued under the 2009 Plan during 2019 and as of December 31, 2019, 160,500 options for the purchase of common shares and 60,747 RSUs were outstanding. Stock option activity is summarized in the following table for the dates indicated: Number of Option Price Weighted Outstanding at January 1, 2018 446,400 $12.63 to $23.21 $ 16.84 Options granted — — — Options exercised (100,400) $12.63 to $23.21 $ 16.97 Options forfeited (3,000) $23.21 $ 23.21 Outstanding at December 31, 2018 343,000 $12.63 to $23.21 $ 16.67 Options granted — — — Options exercised (182,500) $12.63 to $19.46 $ 16.00 Options forfeited — — $ — Outstanding at December 31, 2019 160,500 $12.63 to $23.21 $ 17.60 The following table shows the number, weighted-average exercise price, intrinsic value, and weighted average remaining contractual life of options exercisable, options not yet exercisable and total options outstanding as of December 31, 2019: Currently Currently Not Total Number of options 160,500 — 160,500 Weighted average exercise price $ 17.60 $ — $ 17.60 Intrinsic value (in thousands) $ 3,726 $ — $ 3,726 Weighted average remaining contractual term (yrs.) 2.75 0 2.75 All options outstanding as of December 31, 2019 are fully vested. The Company did not modify any option grants during the three year period ended December 31, 2019. The following table shows the total intrinsic value of options exercised, the total fair value of options vested, total compensation costs for options recognized in income, total tax benefit and excess tax benefits recognized in income related to compensation costs for options during the periods indicated: Year Ended December 31, 2019 2018 2017 Intrinsic value of options exercised $ 4,169,000 $ 2,109,000 $ 2,657,000 Fair value of options that vested $ — $ 75,000 $ 259,000 Total compensation costs for options recognized in expense $ — $ 75,000 $ 259,000 Total tax benefit recognized in income related to compensation costs for options $ — $ 22,000 $ 109,000 Excess tax benefit recognized in income $ 1,233,000 $ 623,000 $ 600,000 During 2019, 2018 and 2017, the Company granted no options. Restricted stock unit activity is summarized in the following table for the dates indicated: Service Condition Vesting RSUs Market Plus Service Condition Number Weighted Average Number of Weighted Average Outstanding at January 1, 2019 66,947 45,536 RSUs granted 35,273 $ 37.41 22,899 $ 31.60 Additional market plus service condition RSUs vested — 7,414 RSUs added through dividend credits 1,314 — RSUs released through vesting (33,060) (22,237) RSUs forfeited/expired (1,877) (2,300) Outstanding at December 31, 2019 68,597 51,312 The 68,597 of service condition vesting RSUs outstanding as of December 31, 2019 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. Additional RSUs credited through dividends are subject to the same vesting requirements as the original grant. The 68,597 of service condition vesting RSUs outstanding as of December 31, 2019 are expected to vest, and be released, on a weighted-average basis, over the next 1.3 years. The Company expects to recognize $1,837,304 of pre-tax compensation costs related to these service condition vesting RSUs between December 31, 2019 and their vesting dates. The Company did not modify any service condition vesting RSUs during 2019 or 2018. The 51,312 of market plus service condition vesting RSUs outstanding as of December 31, 2019 are expected to vest, and be released, on a weighted-average basis, over the next 1.6 years. The Company expects to recognize $903,445 of pre-tax compensation costs related to these RSUs between December 31, 2019 and their vesting dates. As of December 31, 2019, the number of market plus service condition vesting RSUs outstanding that will actually vest, and be released, may be reduced to zero or increased to 76,968 depending on the total return of the Company’s common stock versus the total return of an index of bank stocks from the grant date to the vesting date. The Company did not modify any market plus service condition vesting RSUs during 2019 or 2018. The following table shows the compensation costs and excess tax benefits for RSUs recognized in income for the periods indicated: Year Ended December 31, 2019 2018 2017 Total compensation costs recognized in income Service condition vesting RSUs $ 1,161,237 $ 1,017,000 $ 895,000 Market plus service condition vesting RSUs $ 493,000 $ 370,000 $ 432,000 Excess tax benefit recognized in income Service condition vesting RSUs $ 141,000 $ 104,000 $ 131,000 Market plus service condition vesting RSUs $ 146,000 $ 191,000 $ 175,000

Noninterest Income and Expense

Noninterest Income and Expense	12 Months Ended
	Dec. 31, 2019
Other Income and Expenses [Abstract]
Noninterest Income and Expense	Note 18 – Non-interest Income and Expense The components of other non-interest income were as follows (in thousands): Year Ended December 31, 2019 2018 2017 ATM and interchange fees $ 20,639 $ 18,249 $ 16,727 Service charges on deposit accounts 16,657 15,467 16,056 Other service fees 3,015 2,852 3,282 Mortgage banking service fees 1,917 2,038 2,076 Change in value of mortgage loan servicing rights (1,811) (146) (718) Total service charges and fees 40,417 38,460 37,423 Commissions on sale of non-deposit investment products 2,877 3,151 2,729 Increase in cash value of life insurance 3,029 2,718 2,685 Gain on sale of loans 3,282 2,371 3,109 Lease brokerage income 878 678 782 Sale of customer checks 529 449 372 Gain on sale of investment securities 110 207 961 Gain (loss) on marketable equity securities 86 (64) — Other 2,312 1,091 1,391 Total other noninterest income 13,103 10,601 12,029 Total noninterest income $ 53,520 $ 49,061 $ 49,452 Mortgage banking servicing fees, net of change in value of mortgage loan servicing rights, totaling $106,000, $1,892,000, and $1,358,000 were recorded within service charges and fees for the years ended December 31, 2019, 2018, and 2017, respectively. The components of noninterest expense were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Base salaries, net of deferred loan origination costs $ 70,218 $ 62,422 $ 54,589 Incentive compensation 13,106 11,147 9,227 Benefits and other compensation costs 22,741 20,373 19,114 Total salaries and benefits expense 106,065 93,942 82,930 Occupancy 14,893 12,139 10,894 Data processing and software 13,517 11,021 10,448 Equipment 7,022 6,651 7,141 ATM and POS network charges 5,447 5,271 4,752 Merger and acquisition expense — 5,227 530 Advertising 5,633 4,578 4,101 Professional fees 3,754 3,546 3,745 Intangible amortization 5,723 3,499 1,389 Telecommunications 3,190 3,023 2,713 Regulatory assessments and insurance 1,188 1,906 1,676 Courier service 1,308 1,287 1,035 Operational losses 986 1,260 1,394 Postage 1,258 1,154 1,296 Gain on sale of real estate owned (246) (408) (711) Loss on disposal of fixed assets 82 185 142 Other miscellaneous expense 15,637 14,191 12,980 Total other noninterest expense 79,392 74,530 63,525 Total noninterest expense $ 185,457 $ 168,472 $ 146,455

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 19 – Income Taxes The components of consolidated income tax expense are as follows (in thousands): Year Ended December 31, 2019 2018 2017 Current tax expense Federal $ 20,403 $ 13,109 $ 17,835 State 12,655 9,323 6,650 $ 33,058 22,432 24,485 Deferred tax expense Federal 695 1,842 11,418 State 997 758 1,055 1,692 2,600 12,473 Total tax expense $ 34,750 $ 25,032 $ 36,958 A deferred tax asset or liability is recognized for the tax consequences of temporary differences in the recognition of revenue and expense for financial and tax reporting purposes. The net change during the year in the deferred tax asset or liability results in a deferred tax expense or benefit. On December 22, 2017, President Donald Trump signed into law “H.R.1”, commonly known as the “Tax Cuts and Jobs Act”, which among other items reduced the Federal corporate tax rate from 35% to 21%. The Company’s deferred tax expense as of December 31, 2017 included $7,416,000 from the re-measurement of deferred taxes and $226,000 from an acceleration of amortization expense on the low income housing tax credit investments. The Company recognized, as components of tax expense, tax credits and other tax benefits, and amortization expense relating to our investments in Qualified Affordable Housing Projects as follows for the periods indicated (in thousands): Year Ended December 31, 2019 2018 2017 Tax credits and other tax benefits – decrease in tax expense $ (2,546) $ (1,993) $ (1,753) Amortization – increase in tax expense $ 2,705 $ 1,814 $ 1,611 The carrying value of Low Income Housing Tax Credit Funds was $28,480,000 and $23,885,000 as of December 31, 2019 and 2018, respectively. As of December 31, 2019, the Company has committed to make additional capital contributions to the Low Income Housing Tax Credit Funds in the amount of $13,137,000, and these contributions are expected to be made over the next several years. The provisions for income taxes applicable to income before taxes for the years ended December 31, 2019, 2018 and 2017 differ from amounts computed by applying the statutory Federal income tax rates to income before taxes. The effective tax rate and the statutory federal income tax rate are reconciled as follows: Year Ended December 31, 2019 2018 2017 Federal statutory income tax rate 21.0 % 21.0 % 35.0 % State income taxes, net of federal tax benefit 7.9 8.6 6.9 Tax Cuts and Jobs Act impact of federal rate change — — 9.6 Tax-exempt interest on municipal obligations (0.7) (1.0) (1.9) Tax-exempt life insurance related income (0.6) (0.6) (1.3) Low income housing tax credits (2.3) (2.2) (2.3) Low income housing tax credit amortization 2.1 2.0 2.1 Equity compensation (0.4) (0.4) (1.1) Non-deductible merger expenses — 0.2 0.2 Other 0.4 (0.8) 0.5 Effective Tax Rate 27.4 % 26.8 % 47.7 % The temporary differences, tax effected, which give rise to the Company’s net deferred tax asset recorded in other assets are as follows as of December 31 for the years indicated (in thousands): December 31, 2019 2018 Deferred tax assets: Allowance for losses and reserve for unfunded commitments $ 9,871 $ 10,394 Deferred compensation 2,342 2,780 Accrued pension liability 3,309 9,734 Other accrued expenses 1,678 1,175 Additional unfunded status of the supplemental retirement plans 9,868 1,420 Operating lease liability 8,142 — State taxes 2,441 1,864 Share based compensation 803 1,132 Nonaccrual interest 649 814 Acquisition cost basis 4,556 6,714 Unrealized loss on securities — 6,201 Tax credits 576 623 Net operating loss carryforwards 1,578 2,442 Other 348 423 Total deferred tax assets 46,161 45,716 Deferred tax liabilities: Securities income (762) (1,020) Depreciation (6,109) (5,572) Right of use asset (8,242) — Merger related fixed asset valuations (30) (26) Securities accretion (560) (426) Mortgage servicing rights valuation (1,813) (2,073) Unrealized gain on securities (1,001) — Core deposit intangible (6,453) (8,234) Junior subordinated debt (1,672) (1,729) Prepaid expenses and other (469) (582) Total deferred tax liability (27,111) (19,662) Net deferred tax asset $ 19,050 $ 26,054 As part of the merger with FNB Bancorp in 2019 and North Valley Bancorp in 2014, TriCo acquired federal and state net operating loss carryforwards, capital loss carryforwards, and tax credit carryforwards. These tax attribute carryforwards will be subject to provisions of the tax law that limit the use of such losses and credits generated by a company prior to the date certain ownership changes occur. The amount of the Company’s net operating loss carryforwards that would be subject to these limitations as of December 31, 2019 were none for federal and $18,590,000 for California. The amount of the Company’s tax credits that would be subject to these limitations as of December 31, 2019 are $63,000 and $648,000 for federal and California, respectively. Due to the limitation, a significant portion of the state tax credits will expire regardless of whether the Company generates future taxable income. As such, the Company has recorded the future benefit of these tax credits on the books at the value which is more likely than not to be realized. These tax loss and tax credit carryforwards expire at various dates beginning in 2019. The Company believes that a valuation allowance is not needed to reduce the deferred tax assets as it is more likely than not that the results of future operations will generate sufficient taxable income to realize the deferred tax assets, including the tax attribute carryforwards acquired as part of the FNB Bancorp and North Valley Bancorp merger. Disclosure of unrecognized tax benefits at December 31, 2019 and 2018 were not considered significant for disclosure purposes. Management does not expect the unrecognized tax benefit will materially change in the next 12 months. During the years ended December 31, 2019 and December 31, 2018 the Company did not recognize and significant amounts related to interest and penalties associated with taxes. The Company files income tax returns in the U.S. federal jurisdiction, and California. With few exceptions, the Company is no longer subject to U.S. federal and state/local income tax examinations by tax authorities for years before 2016 and 2015, respectively.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Note 20 – Earnings per Share Earnings per share have been computed based on the following: Year Ended December 31, (in thousands) 2019 2018 2017 Net income $ 92,072 $ 68,320 $ 40,554 Average number of common shares outstanding 30,478 26,593 22,912 Effect of dilutive stock options and restricted stock 167 287 338 Average number of common shares outstanding used to calculate diluted earnings per share 30,645 26,880 23,250 Options excluded from diluted earnings per share because the effect of these options was antidilutive — 10,056 —

Comprehensive Income

Comprehensive Income	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Comprehensive Income	Note 21 – Comprehensive Income Accounting principles generally require that recognized revenue, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available-for-sale securities, are reported as a separate component of the equity section of the balance sheet, such items, along with net income, are components of comprehensive income. The components of other comprehensive income and related tax effects are as follows: Year Ended December 31, (in thousands) 2019 2018 2017 Unrealized holding gains (losses) on available for sale securities before reclassifications $ 24,471 $ (17,057) $ 6,422 Amounts reclassified out of accumulated other comprehensive income: Realized gains on debt securities (110) (207) (961) Adoption ASU 2016-01 — 62 — Adoption ASU 2018-02 — (425) — Total amounts reclassified out of accumulated other (110) (570) (961) Unrealized holding gains (losses) on available for sale securities after reclassifications 24,361 (17,627) 5,461 Tax effect (7,202) 5,193 (2,296) Unrealized holding gains (losses) on available for sale securities, net of tax 17,159 (12,434) 3,165 Change in unfunded status of the supplemental retirement plans before reclassifications (6,745) 762 (1,016) Amounts reclassified out of accumulated other comprehensive income: Amortization of prior service cost (54) (54) (12) Amortization of actuarial losses 408 510 390 Adoption ASU 2018-02 — (668) — Total amounts reclassified out of accumulated other 354 (212) 378 Change in unfunded status of the supplemental retirement plans after reclassifications (6,391) 550 (638) Tax effect 1,889 (162) 268 Change in unfunded status of the supplemental retirement plans, net of tax (4,502) 388 (370) Change in joint beneficiary agreement liability before reclassifications — 426 (110) Tax effect — — — Change in unfunded status of the supplemental retirement plans, net of tax — 426 (110) Total other comprehensive income (loss) $ 12,657 $ (11,620) $ 2,685 The components of accumulated other comprehensive income, included in shareholders’ equity, are as follows: Year Ended December 31, (in thousands) 2019 2018 Net unrealized gain (loss) on available for sale securities $ 3,387 (20,974) Tax effect (1,001) 6,201 Unrealized holding loss on available for sale securities, net of tax 2,386 (14,773) Unfunded status of the supplemental retirement plans (11,193) (4,802) Tax effect 3,309 1,420 Unfunded status of the supplemental retirement plans, net of tax (7,884) (3,382) Joint beneficiary agreement liability, net of tax 276 276 Accumulated other comprehensive loss $ (5,222) $ (17,879)

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Retirement Plans	Note 22 – Retirement Plans 401(k) Plan The Company sponsors a 401(k) Plan whereby substantially all employees age 21 and over with 90 days of service may participate. Participants may contribute a portion of their compensation subject to certain limits based on federal tax laws. Prior to July 1, 2015, the Company did not contribute to the 401(k) Plan. Effective July 1, 2015, the Company initiated a discretionary matching contribution equal to 50% of participant’s elective deferrals each quarter, up to 4% of eligible compensation. The Company recorded salaries & benefits expense attributable to the 401(k) Plan matching contributions and 401(k) Plan matching contributions for the years ended: Year Ended December 31, (in thousands) 2019 2018 2017 401(k) Plan benefits expense $ 1,119 $ 879 $ 776 401(k) Plan contributions made by the Company $ 1,003 $ 872 $ 767 Employee Stock Ownership Plan Substantially all employees with at least one Year Ended December 31, (in thousands) 2019 2018 2017 ESOP benefits expense $ 2,500 $ 1,887 $ 2,149 ESOP contributions made by the Company $ 1,875 $ 1,952 $ 2,073 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 certain of the participants and intends to hold these policies until death as a cost recovery of the Company’s deferred compensation obligations of $7,923,000 and $9,402,000 at December 31, 2019 and 2018, respectively. Earnings credits on deferred balances included in non-interest expense are included in the following table: Year Ended December 31, (in thousands) 2019 2018 2017 Deferred compensation earnings credits included in non-interest expense $ 363 $ 462 $ 478 Supplemental Retirement Plans The Company has supplemental retirement plans for certain directors and key executives. These plans are non-qualified defined benefit plans and are unsecured and unfunded. The Company has purchased insurance on the lives of the participants and intends to hold these policies until death as a cost recovery of the Company’s retirement obligations. The cash values of the insurance policies purchased to fund the deferred compensation obligations and the supplemental retirement obligations were $117,823,000 and $117,318,000 at December 31, 2019 and 2018, respectively. The Company recorded in other liabilities the additional unfunded status of the supplemental retirement plans of $11,193,000 and $4,802,000 related to the supplemental retirement plans as of December 31, 2019 and 2018, respectively. These amounts represent the amount by which the projected benefit obligations for these retirement plans exceeded the fair value of plan assets plus amounts previously accrued related to the plans. The projected benefit obligation is recorded in other liabilities. At December 31, 2019 and 2018, the additional unfunded status of the supplemental retirement plans of $11,193,000 and $4,802,000 were offset by a reduction of shareholders’ equity accumulated other comprehensive loss of $7,884,000 and $3,382,000, respectively, representing the after-tax impact of the additional unfunded status of the supplemental retirement plans, and the related deferred tax asset of $3,309,000 and $1,420,000, respectively. Amounts recognized as a component of accumulated other comprehensive loss as of year-end that have not been recognized as a component of the combined net period benefit cost of the Company’s defined benefit pension plans are presented in the following table. The Company expects to recognize approximately $2,984,000 of the net actuarial loss reported in the following table as of December 31, 2019 as a component of net periodic benefit cost during 2020. December 31, (in thousands) 2019 2018 Transition obligation $ 1 $ 3 Prior service cost (141) (194) Net actuarial loss 11,333 4,993 Amount included in accumulated other comprehensive loss 11,193 4,802 Deferred tax benefit (3,309) (1,420) Amount included in accumulated other comprehensive loss, net of tax $ 7,884 $ 3,382 Information pertaining to the activity in the supplemental retirement plans, using a measurement date of December 31, is as follows: December 31, (in thousands) 2019 2018 Change in benefit obligation: Benefit obligation at beginning of year $ (29,196) $ (28,472) Service cost (879) (973) Interest cost (1,131) (949) Actuarial (loss)/gain (6,747) 92 Plan amendments — — Benefits paid 1,216 1,106 Benefit obligation at end of year $ (36,737) $ (29,196) Change in plan assets: Fair value of plan assets at beginning of year $ — $ — Fair value of plan assets at end of year $ — $ — Funded status $ (36,737) $ (29,196) Unrecognized net obligation existing at January 1, 1986 1 3 Unrecognized net actuarial loss 11,333 4,993 Unrecognized prior service cost (141) (194) Accumulated other comprehensive income (11,193) (4,802) Accrued benefit cost $ (36,737) $ (29,196) Accumulated benefit obligation $ (35,981) $ (27,544) The following table sets forth the net periodic benefit cost recognized for the supplemental retirement plans: Year Ended December 31, (in thousands) 2019 2018 2017 Net pension cost included the following components: Service cost-benefits earned during the period $ 879 $ 973 $ 941 Interest cost on projected benefit obligation 1,131 949 991 Amortization of net obligation at transition 2 2 2 Amortization of prior service cost (54) (54) (12) Recognized net actuarial loss 408 510 390 Net periodic pension cost $ 2,366 $ 2,380 $ 2,312 The following table sets forth assumptions used in accounting for the plans: Year Ended December 31, 2019 2018 2017 Discount rate used to calculate benefit obligation 2.82 % 3.96 % 3.40 % Discount rate used to calculate net periodic pension cost 3.96 % 3.40 % 3.80 % Average annual increase in executive compensation 3.25 % 3.25 % 3.25 % Average annual increase in director compensation — % — % — % The following table sets forth the expected benefit payments to participants and estimated contributions to be made by the Company under the supplemental retirement plans for the years indicated: Expected Benefit Estimated (in thousands) 2020 $ 1,555 $ 1,555 2021 2,128 2,128 2022 2,179 2,179 2023 2,179 2,179 2024 2,191 2,193 2025-2029 10,956 10,956

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Note 23 – Related Party Transactions Certain directors, officers, and companies with which they are associated were customers of, and had banking transactions with, the Company or the Bank in the ordinary course of business. The following table summarizes the activity in these loans for the periods indicated (in thousands): Balance January 1, 2017 $ 2,148 Advances/new loans 8,854 Removed/payments (1,799) Balance December 31, 2018 9,203 Advances/new loans 9,032 Removed/payments (8,114) Balance December 31, 2019 $ 10,121 Deposits of directors, officers and other related parties to the Bank totaled $41,647,000 and $43,881,000 at December 31, 2019 and 2018, respectively.

Fair Value Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 24 – Fair Value Measurement The Company utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, income approach, and/or the cost approach. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability including assumptions about the risk inherent in a particular valuation technique, the effect of a restriction on the sale or use of an asset and the risk of nonperformance. Securities available-for-sale and mortgage servicing rights are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets on a nonrecurring basis, such as loans held for sale, loans held for investment and certain other assets. These nonrecurring fair value adjustments typically involve application of lower of cost or market accounting or impairment write-downs of individual assets. The Company groups assets and liabilities at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observable nature of the assumptions used to determine fair value. These levels are: Level 1 — Valuation is based upon quoted prices for identical instruments traded in active markets. Level 2 — Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Level 3 — Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques. Securities available for sale —Securities available for sale are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss assumptions. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange, U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets and money market funds. Level 2 securities include mortgage-backed securities issued by government sponsored entities, municipal bonds and corporate debt securities. The Company had no securities classified as Level 3 during any of the periods covered in these financial statements. Loans held for sale —Loans held for sale are carried at the lower of cost or fair value. The fair value of loans held for sale is based on what secondary markets are currently offering for loans with similar characteristics. As such, we classify those loans subjected to nonrecurring fair value adjustments as Level 2. Impaired originated and PNCI loans —Originated and PNCI loans are not recorded at fair value on a recurring basis. However, from time to time, an originated or PNCI loan is considered impaired and an allowance for loan losses is established. Originated and PNCI loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. The fair value of an impaired originated or PNCI loan is estimated using one of several methods, including collateral value, fair value of similar debt, enterprise value, liquidation value and discounted cash flows. Those impaired originated and PNCI loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. Impaired originated and PNCI loans where an allowance is established based on the fair value of collateral require classification in the fair value hierarchy. When the fair value of the collateral is based on an observable market price or a current appraised value which uses substantially observable data, the Company records the impaired originated or PNCI loan as nonrecurring Level 2. When an appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value, or the appraised value contains a significant unobservable assumption, such as deviations from comparable sales, and there is no observable market price, the Company records the impaired originated or PNCI loan as nonrecurring Level 3. 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 at the date of foreclosure, establishing a new cost basis. Subsequent to foreclosure, management periodically performs valuations and the assets are carried at the lower of carrying amount or fair value less cost to sell. When the fair value of foreclosed assets is based on an observable market price or a current appraised value which uses substantially observable data, the Company records the impaired originated loan as nonrecurring Level 2. When an appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value, or the appraised value contains a significant unobservable assumption, such as deviations from comparable sales, and there is no observable market price, the Company records the foreclosed asset as nonrecurring Level 3. Revenue and expenses from operations and changes in the valuation allowance are included in other non-interest expense. Mortgage servicing rights —Mortgage servicing rights are carried at fair value. A valuation model, which utilizes a discounted cash flow analysis using a discount rate and prepayment speed assumptions is used in the computation of the fair value measurement. While the prepayment speed assumption is currently quoted for comparable instruments, the discount rate assumption currently requires a significant degree of management judgment and is therefore considered an unobservable input. As such, the Company classifies mortgage servicing rights subjected to recurring fair value adjustments as Level 3. Additional information regarding mortgage servicing rights can be found in Note 10 in the consolidated financial statements at Item 1 of this report. The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis (in thousands): Fair value at December 31, 2019 Total Level 1 Level 2 Level 3 Marketable equity securities $ 2,960 $ 2,960 $ — $ — Debt securities available for sale: Obligations of U.S. government agencies 472,980 — 472,980 — Obligations of states and political subdivisions 109,601 — 109,601 — Corporate bonds 2,532 — 2,532 — Asset backed securities 365,025 — 365,025 — Loans held for sale 5,265 — 5,265 — Mortgage servicing rights 6,200 — — 6,200 Total assets measured at fair value $ 964,563 $ 2,960 $ 955,403 $ 6,200 Fair value at December 31, 2018 Total Level 1 Level 2 Level 3 Marketable equity securities $ 2,874 $ 2,874 $ — $ — Debt securities available for sale: Obligations of U.S. government agencies 629,981 — 629,981 — Obligations of states and political subdivisions 126,072 — 126,072 — Corporate bonds 4,478 — 4,478 — Asset backed securities 354,505 — 354,505 — Loans held for sale 3,687 — 3,687 — Mortgage servicing rights 7,098 — — 7,098 Total assets measured at fair value $ 1,128,695 $ 2,874 $ 1,118,723 $ 7,098 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 2019 or 2018. The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the years ended December 31, 2019, 2018, and 2017. Had there been any transfer into or out of Level 3 during 2019, 2018, or 2017, 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): Year ended December 31, Beginning Transfers Change Issuances Ending 2019: Mortgage servicing rights $ 7,098 — $ (1,811) $ 913 $ 6,200 2018: Mortgage servicing rights $ 6,687 — $ (146) $ 557 $ 7,098 2017: Mortgage servicing rights $ 6,595 — $ (718) $ 810 $ 6,687 The Company’s method for determining the fair value of mortgage servicing rights is described in Note 1. The key unobservable inputs used in determining the fair value of mortgage servicing rights are mortgage prepayment speeds and the discount rate used to discount cash projected cash flows. Generally, any significant increases in the mortgage prepayment speed and discount rate utilized in the fair value measurement of the mortgage servicing rights will result in a negative fair value adjustments (and decrease in the fair value measurement). Conversely, a decrease in the mortgage prepayment speed and discount rate will result in a positive fair value adjustment (and increase in the fair value measurement). Note 10 contains additional information regarding mortgage servicing rights. The following table presents quantitative information about recurring Level 3 fair value measurements at December 31, 2019 and 2018: December 31, 2019 Fair Value Valuation Unobservable Range, Mortgage Servicing Rights $6,200 Discounted Constant 5.0%-27.3%, 7.6% December 31, 2018 Discount rate 12%-13%, 12% Mortgage Servicing Rights $7,098 Discounted Constant 6.2%-42.0%, 11.0% Discount rate 10.0%-14.0%, 12.0% The tables below present the recorded amount of assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated, that had a write-down or an additional allowance provided during the periods indicated (in thousands): Year ended December 31, 2019 Total Level 1 Level 2 Level 3 Total Gains Fair value: Impaired Originated & PNCI loans $ 1,055 — — $ 1,055 $ (652) Real estate owned 417 — — 417 (27) Total assets measured at fair value $ 1,472 — — $ 1,472 $ (679) Year ended December 31, 2018 Total Level 1 Level 2 Level 3 Total Gains Fair value: Impaired Originated & PNCI loans $ 281 — — $ 281 $ (294) Real estate owned 1,311 — — 1,311 (8) Total assets measured at fair value $ 1,592 — — $ 1,592 $ (302) The impaired Originated and PNCI loan amount above represents impaired, collateral dependent loans that have been adjusted to fair value. When we identify a collateral dependent loan as impaired, we measure the impairment using the current fair value of the collateral, less selling costs. Depending on the characteristics of a loan, the fair value of collateral is generally estimated by obtaining external appraisals. If we determine that the value of the impaired loan is less than the recorded investment in the loan, we recognize this impairment and adjust the carrying value of the loan to fair value through the allowance for loan and lease losses. The loss represents charge-offs or impairments on collateral dependent loans for fair value adjustments based on the fair value of collateral. The carrying value of loans fully charged-off is zero. The foreclosed assets amount above represents impaired real estate that has been adjusted to fair value. Foreclosed assets represent real estate which the Bank has taken control of in partial or full satisfaction of loans. At the time of foreclosure, other real estate owned is recorded at fair value less costs to sell, which becomes the property’s new basis. Any write-downs based on the asset’s fair value at the date of acquisition are charged to the allowance for loan and lease losses. After foreclosure, management periodically performs valuations such that the real estate is carried at the lower of its new cost basis or fair value, net of estimated costs to sell. Fair value adjustments on other real estate owned are recognized within net loss on real estate owned. The loss represents impairments on non-covered other real estate owned for fair value adjustments based on the fair value of the real estate. The Company’s property appraisals are primarily based on the sales comparison approach and income approach methodologies, which consider recent sales of comparable properties, including their income generating characteristics, and then make adjustments to reflect the general assumptions that a market participant would make when analyzing the property for purchase. These adjustments may increase or decrease an appraised value and can vary significantly depending on the location, physical characteristics and income producing potential of each property. Additionally, the quality and volume of market information available at the time of the appraisal can vary from period to period and cause significant changes to the nature and magnitude of comparable sale adjustments. Given these variations, comparable sale adjustments are generally not a reliable indicator for how fair value will increase or decrease from period to period. Under certain circumstances, management discounts are applied based on specific characteristics of an individual property. The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at December 31, 2019 and 2018: December 31, 2019 Fair Value Valuation Technique Unobservable Inputs Range, Impaired Originated & PNCI loans $ 1,055 Sales comparison Adjustment for differences between Not meaningful; Real estate owned (Residential) $ 417 Sales comparison Adjustment for differences between Not meaningful; December 31, 2018 Fair Value Valuation Technique Unobservable Inputs Range, Impaired Originated & PNCI loans $ 281 Sales comparison Adjustment for differences between (74%)—23%; (19.76%) N/A Real estate owned (Residential) $ 693 Sales comparison Adjustment for differences between (47%)—39%; (3.13%) Real estate owned (Commercial) $ 618 Sales comparison Adjustment for differences between (84%)—19%; (84%) The estimated fair values of financial instruments that are reported at amortized cost in the Corporation’s consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows (in thousands): December 31, 2019 December 31, 2018 Carrying Fair Carrying Fair Financial assets: Level 1 inputs: Cash and due from banks $ 92,816 $ 92,816 $ 119,781 $ 119,781 Cash at Federal Reserve and other banks 183,691 183,691 107,752 107,752 Level 2 inputs: Securities held to maturity 375,606 381,525 444,936 437,370 Restricted equity securities 17,250 N/A 17,250 N/A Level 3 inputs: Loans, net 4,276,750 4,263,064 3,989,432 4,006,986 Financial liabilities: Level 2 inputs: Deposits 5,366,994 5,365,921 5,366,466 5,362,173 Other borrowings 18,454 18,454 15,839 15,839 Level 3 inputs: Junior subordinated debt 57,232 56,297 57,042 62,610 Contract Fair Contract Fair Off-balance sheet: Level 3 inputs: Commitments $ 1,309,326 $ 13,093 $ 1,192,054 $ 11,921 Standby letters of credit 12,014 120 11,346 113 Overdraft privilege commitments 110,402 1,104 111,956 1,120

TriCo Bancshares Condensed Fina

TriCo Bancshares Condensed Financial Statements (Parent Only)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
TriCo Bancshares Condensed Financial Statements (Parent Only)	Note 25 – TriCo Bancshares Condensed Financial Statements (Parent Only) Condensed Balance Sheets December 31, December 31, (In thousands) Assets Cash and cash equivalents $ 5,008 $ 2,374 Investment in Tri Counties Bank 957,544 880,907 Other assets 1,765 1,723 Total assets $ 964,317 $ 885,004 Liabilities and shareholders’ equity Other liabilities $ 515 $ 589 Junior subordinated debt 57,232 57,042 Total liabilities 57,747 57,631 Shareholders’ equity: Preferred stock, no par value: 1,000,000 shares authorized, zero issued and outstanding at December 31, 2019 and 2018 — — Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 30,523,824 and 30,417,223 shares at December 31, 2019 and 2018, respectively 543,998 541,762 Retained earnings 367,794 303,490 Accumulated other comprehensive loss, net (5,222) (17,879) Total shareholders’ equity 906,570 827,373 Total liabilities and shareholders’ equity $ 964,317 $ 885,004 Condensed Statements of Income Year Ended December 31, 2019 2018 2017 (In thousands) Interest expense $ (3,272) $ (3,131) $ (2,535) Administration expense (877) (1,489) (915) Loss before equity in net income of Tri Counties Bank (4,149) (4,620) (3,450) Equity in net income of Tri Counties Bank: Distributed 32,669 26,432 19,236 Undistributed 62,326 45,315 23,359 Income tax benefit 1,226 1,193 1,409 Net income $ 92,072 $ 68,320 $ 40,554 Condensed Statements of Comprehensive Income Year Ended December 31, 2019 2018 2017 (In thousands) Net income $ 92,072 $ 68,320 $ 40,554 Other comprehensive income (loss), net of tax: Increase (decrease) in unrealized gains on available for sale securities arising during the period 17,159 (12,434) 3,165 Change in minimum pension liability (4,502) 388 (370) Change in joint beneficiary agreement liablity — 426 (110) Other comprehensive income (loss) 12,657 (11,620) 2,685 Comprehensive income $ 104,729 $ 56,700 $ 43,239 Condensed Statements of Cash Flows Year Ended December 31, 2019 2018 2017 (In thousands) Operating activities: Net income $ 92,072 $ 68,320 $ 40,554 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed equity in earnings of Tri Counties Bank (62,326) (45,315) (23,359) Equity compensation vesting expense 1,654 1,462 1,586 Net change in other assets and liabilities (1,580) (4,983) (1,295) Net cash provided by operating activities 29,820 19,484 17,486 Investing activities: None Financing activities: Issuance of common stock through option exercise 9 218 396 Repurchase of common stock (2,196) (2,483) (1,629) Cash dividends paid — common (24,999) (18,769) (15,131) Net cash used for financing activities (27,186) (21,034) (16,364) Net change in cash and cash equivalents 2,634 (1,550) 1,122 Cash and cash equivalents at beginning of year 2,374 3,924 2,802 Cash and cash equivalents at end of year $ 5,008 $ 2,374 $ 3,924

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2019
Banking and Thrift [Abstract]
Regulatory Matters	Note 26 – Regulatory Matters The Company is subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company must meet specific capital guidelines that involve quantitative measures of the Company’s assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting practices. The Company’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Company to maintain minimum amounts and ratios (set forth in the table below) of total, Tier 1, and common equity Tier 1capital to risk-weighted assets, and of Tier 1 capital to average assets. Management believes as of December 31, 2019, the Company and Bank meet all capital adequacy requirements to which they are subject. Actual Required for Capital Adequacy Purposes Required to be (dollars in thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2019: Total Capital (to Risk Weighted Assets): Consolidated $ 753,200 15.07 % $ 524,944 10.50 % N/A N/A Tri Counties Bank $ 748,660 14.98 % $ 524,759 10.50 % $ 499,770 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 719,809 14.40 % $ 424,955 8.50 % N/A N/A Tri Counties Bank $ 715,269 14.31 % $ 424,805 8.50 % $ 399,816 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 664,296 13.29 % $ 349,963 7.00 % N/A N/A Tri Counties Bank $ 715,269 14.31 % $ 349,839 7.00 % $ 324,851 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 719,809 11.55 % $ 249,343 4.00 % N/A N/A Tri Counties Bank $ 715,269 11.47 % $ 249,337 4.00 % $ 311,672 5.00 % Actual Required for Capital Adequacy Purposes Required to be (dollars in thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2018: Total Capital (to Risk Weighted Assets): Consolidated $ 682,419 14.40 % $ 497,486 10.50 % N/A N/A Tri Counties Bank $ 680,624 14.37 % $ 497,305 10.50 % $ 473,624 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 647,262 13.66 % $ 402,727 8.50 % N/A N/A Tri Counties Bank $ 645,467 13.63 % $ 402,581 8.50 % $ 378,899 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 591,933 12.49 % $ 331,658 7.00 % N/A N/A Tri Counties Bank $ 645,467 13.63 % $ 331,537 7.00 % $ 307,856 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 647,262 10.68 % $ 242,452 4.00 % N/A N/A Tri Counties Bank $ 645,467 10.65 % $ 242,447 4.00 % $ 303,059 5.00 %

Summary of Quarterly Results of

Summary of Quarterly Results of Operations (unaudited)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Results of Operations (unaudited)	Note 27 – Summary of Quarterly Results of Operations (unaudited) The following table sets forth the results of operations for the four quarters of 2019 and 2018, 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. 2019 Quarters Ended (dollars in thousands, except per share data) December 31, September 30, June 30, March 31, Interest and dividend income: Loans: Discount accretion $ 2,218 $ 2,360 $ 1,904 $ 1,655 All other loan interest income 54,644 54,639 53,587 52,743 Total loan interest income 56,862 56,999 55,491 54,398 Debt securities, dividends and interest bearing cash at banks 11,056 11,890 12,689 13,059 Total interest income 67,918 68,889 68,180 67,457 Interest expense 3,722 4,201 3,865 3,587 Net interest income 64,196 64,688 64,315 63,870 (Benefit from reversal of) provision for loan losses (298) (329) 537 (1,600) Net interest income after provision for loan losses 64,494 65,017 63,778 65,470 Noninterest income 14,186 14,108 13,423 11,803 Noninterest expense 46,964 46,344 46,697 45,452 Income before income taxes 31,716 32,781 30,504 31,821 Income tax expense 8,826 9,386 7,443 9,095 Net income $ 22,890 $ 23,395 $ 23,061 $ 22,726 Per common share: Net income (diluted) $ 0.75 $ 0.76 $ 0.75 $ 0.74 Dividends $ 0.22 $ 0.22 $ 0.19 $ 0.19 2018 Quarters Ended (dollars in thousands, except per share data) December 31, September 30, June 30, March 31, Interest and dividend income: Loans: Discount accretion $ 1,982 $ 2,098 $ 559 $ 632 All other loan interest income 53,680 51,004 38,745 37,417 Total loan interest income 55,662 53,102 39,304 38,049 Debt securities, dividends and interest bearing cash at banks 12,403 11,452 9,174 9,072 Total interest income 68,065 64,554 48,478 47,121 Interest expense 4,063 4,065 2,609 2,135 Net interest income 64,002 60,489 45,869 44,986 Provision for (benefit from reversal of provision for) loan losses 806 2,651 (638) (236) Net interest income after provision for loan losses 63,196 57,838 46,507 45,222 Noninterest income 12,634 12,186 12,174 12,290 Noninterest expense 45,285 47,378 37,870 38,162 Income before income taxes 30,545 22,646 20,811 19,350 Income tax expense 7,334 6,476 5,782 5,440 Net income $ 23,211 $ 16,170 $ 15,029 $ 13,910 Per common share: Net income (diluted) $ 0.76 $ 0.53 $ 0.65 $ 0.60 Dividends $ 0.19 $ 0.17 $ 0.17 $ 0.17

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
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 and retail banking business in 29 California counties. The Company has five capital subsidiary business trusts (collectively, the “Capital Trusts”) that issued trust preferred securities, including two organized by the Company and three acquired with the acquisition of North Valley Bancorp. 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. All adjustments necessary for a fair presentation of these consolidated financial statements have been included and are of a normal and recurring nature. 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 $1,719,000 are accounted for under the equity method and, accordingly, are included in other assets on the consolidated balance sheets. 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 sheets.
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.
Segment and Significant Group Concentration of Credit Risk	Segment and Significant Group Concentration of Credit Risk The Company grants agribusiness, commercial, consumer, and residential loans to customers located throughout Northern and Central 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.
Geographical Descriptions	Geographical Descriptions For the purpose of describing the geographical location of the Company’s operations, the Company has defined northern California as that area of California north of, and including, Stockton to the east and San Jose to the west; central California as that area of the state south of Stockton and San Jose, to and including, Bakersfield to the east and San Luis Obispo to the west; and southern California as that area of the state south of Bakersfield and San Luis Obispo.
Business Combinations	Business Combinations The Company accounts for acquisitions of businesses using the acquisition method of accounting. Under the acquisition method, assets acquired and liabilities assumed are recorded at their estimated fair values at the date of acquisition. Management utilizes various valuation techniques including discounted cash flow analyses to determine these fair values. Any excess of the purchase price over amounts allocated to the acquired assets, including identifiable intangible assets, and liabilities assumed is recorded as goodwill.
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.
Marketable Equity Securities	Marketable Equity Securities As of December 31, 2017, marketable equity securities with a fair value of $2,874,000 were recorded within investment securities available for sale on the consolidated balance sheets with changes in the fair value recorded through other comprehensive income and accumulated other comprehensive income (loss). As of January 1, 2018, the Company adopted the new accounting standard for Financial Instruments using a prospective transition approach, which requires equity investments to be measured at fair value with changes in fair value recognized in net income. The adoption of this guidance resulted in a $62,000 decrease to beginning retained earnings and a decrease to the deferred tax of $18,000. During the twelve months ended December 31, 2019 and 2018, the Company recognized ($86,000) of unrealized gains and $64,000 of unrealized losses, respectively, in the consolidated statements of income related to changes in the fair value of marketable equity securities.
Debt Securities	Debt Securities The Company classifies its debt 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 and changes in the value of these securities are recorded through earnings. 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. Discounts are amortized or accreted over the expected life of the related investment security as an adjustment to yield using the effective interest method. Premiums on callable debt securities are generally amortized to the earliest call date of the security with the exception of mortgage backed securities, where estimated prepayments, if any, are considered. Dividend and interest income are recognized when earned. Realized gains and losses are derived from the amortized cost of the security sold. The Company did not have any debt securities classified as trading during 2019 and 2018. The Company assesses other-than-temporary impairment (“OTTI”) based on whether it intends to sell a security or if it is likely that the Company would be required to sell the security before recovery of the amortized cost basis of the investment, which may be maturity. For debt securities, if we intend to sell the security or it is more likely than not that we will be required to sell the security before recovering its cost basis, the entire impairment loss would be recognized in earnings as an OTTI. If we do not intend to sell the security and it is not likely that we will be required to sell the security but we do not expect to recover the entire amortized cost basis of the security, only the portion of the impairment loss representing credit losses would be recognized in earnings. The credit loss on a security is measured as the difference between the amortized cost basis and the present value of the cash flows expected to be collected. Projected cash flows are discounted by the original or current effective interest rate depending on the nature of the security being measured for potential OTTI. The remaining impairment related to all other factors, the difference between the present value of the cash flows expected to be collected and fair value, is recognized as a charge to other comprehensive income (“OCI”). Impairment losses related to all other factors are presented as separate categories within OCI. The accretion of the amount recorded in OCI increases the carrying value of the investment and does not affect earnings. If there is an indication of additional credit losses the security is re-evaluated according to the procedures described above. No OTTI losses were recognized during the years ended December 31, 2019, 2018 or 2017.
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. Both cash and stock dividends are reported as income when received.
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 non-interest 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 to 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 considered 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, if any, certain repayment 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 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 an estimate of these probable incurred losses inherent in the portfolio. The Company formally assesses the adequacy of the allowance for originated loan losses on a quarterly basis. Determination of the adequacy is based on ongoing assessments of the probable risk in the outstanding originated loan portfolio, and to a lesser extent the Company’s originated loan commitments. These assessments include the periodic re-grading of credits based on changes in their individual credit characteristics including delinquency, seasoning, recent financial performance of the borrower, economic factors, changes in the interest rate environment, growth of the portfolio as a whole or by segment, and other factors as warranted. Loans are initially graded when originated. They are re-graded as they are renewed, when there is a new loan to the same borrower, when identified facts demonstrate changes in the risk of repayment, or if they become delinquent. Re-grading of larger problem loans occurs at least quarterly. Confirmation of the quality of the grading process is obtained by periodic independent credit reviews conducted by consultants specifically hired for this purpose and by various bank regulatory agencies. The Company’s method for assessing the appropriateness of the allowance for originated loan losses includes specific allowances for impaired originated loans, formula allowance factors for pools of credits, and allowances for changing environmental factors (e.g., interest rates, growth, economic conditions, etc.). Allowance factors for loan pools are 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 measured and recorded at their fair value as of the acquisition date. Loans acquired with evidence of credit deterioration since origination for which it is probable that all contractually required payments will not be collected are referred to as purchased credit impaired (PCI) loans. PCI loans are recorded at fair value at acquisition date, factoring in credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for loan losses is not carried over or recorded as of the acquisition date. Fair value is defined as the present value of the future estimated principal and interest payments of the loan, with the discount rate used in the present value calculation representing the estimated effective yield of the loan. Default rates, loss severity, and prepayment speed assumptions are periodically reassessed and our estimate of future payments is adjusted accordingly. The difference between contractual future payments and estimated future payments is referred to as the nonaccretable difference. The difference between estimated future payments and the present value of the estimated future payments is referred to as the accretable yield. The accretable yield represents the amount that is expected to be recorded as interest income over the remaining life of the loan. If after acquisition, the Company determines that the estimated future cash flows of a PCI loan are expected to be more than originally estimated, an increase in the discount rate (effective yield) would be made such that the newly increased accretable yield would be recognized, on a level yield basis, over the remaining estimated life of the loan. If, thereafter, the Company determines that the estimated future cash flows of a PCI loan are expected to be less than previously estimated, an allowance for loan loss would be established through a provision for loan losses charged to expense to decrease the present value to the required level. If the estimated cash flows improve after an allowance has been established for a loan, the allowance may be partially or fully reversed depending on the improvement in the estimated cash flows. Only after the allowance has been fully reversed may the discount rate be increased. PCI loans are put on nonaccrual status when cash flows cannot be reasonably estimated. PCI loans on nonaccrual status are accounted for using the cost recovery method or cash basis method of income recognition. PCI loans are charged off when evidence suggests cash flows are not recoverable. Foreclosed assets from PCI loans are recorded in foreclosed assets at fair value with the fair value at time of foreclosure representing estimated proceeds less selling costs from the collateral securing the loan. PCI loans with similar risk characteristics and acquisition time frame may be “pooled” and have their cash flows aggregated as if they were one loan or accounted for individually. Acquired loans that are not PCI loans are referred to as purchased not credit impaired (PNCI) loans and interest income is accrued on a level-yield basis. For income recognition purposes, this method assumes that all contractual cash flows will be collected, and no allowance for loan losses is established at the time of acquisition. Post-acquisition date, an allowance for loan losses may need to be established for acquired loans through a provision charged to earnings for credit losses incurred subsequent to acquisition. The loss estimate for acquired loans is measured based on the probable shortfall in relation to the contractual note requirements, consistent with our allowance for loan loss policy for similar loans. Throughout these financial statements, reference to “Loans” or “Allowance for loan losses” relates to all categories of loans, including Originated, PNCI, and PCI. When not referring to all categories of loans, specific reference to Originated, PNCI, or PCI is made. 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.
Foreclosed Assets	Real estate owned (REO) includes assets acquired through, or in lieu of, loan foreclosure. REO is held for sale and are initially recorded at fair value less estimated costs to sell at the date of acquisition, 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 non-interest expense, along with the gain or loss on sale of REO.
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 years for furniture and equipment and 15-40 years for land improvements and buildings.
Company Owned Life Insurance	Company Owned Life Insurance The Company has purchased life insurance policies on certain key executives. Company owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. 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 non-interest income. If the Bank decided to surrender any of the policies prior to the death of the insured, such surrender may result in a tax expense related to the life-to-date cumulative increase in cash value of the policy. If the Bank retains such policies until the death of the insured, the Bank would receive nontaxable proceeds from the insurance company equal to the death benefit of the policies. The Bank has
Goodwill, Other Intangible and Long-Lived Assets	Goodwill, Other Intangible and Long-Lived Assets Goodwill represents the excess of costs over fair value of net assets of businesses acquired from a business combination. The Company has an identifiable intangible asset consisting of core deposit intangibles (“CDI”). CDI are amortized over their respective estimated useful lives, and reviewed periodically for impairment. Goodwill and other intangible assets acquired in a business combination and determined to have an indefinite useful life are not amortized, but instead tested for impairment at least annually. Other intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values, and reviewed periodically for impairment. As of September 30 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. 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.
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 non-interest 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, when earned, and changes in fair value of the MSR, are recorded in non-interest income. 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.
Reserve for Unfunded Commitments	Reserve for Unfunded Commitments The reserve for unfunded commitments is established through a provision for losses – unfunded commitments, the changes of which are recorded in 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 credit and other loans, standby letters of credit, and unused deposit account overdraft privileges. 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.
Off-Balance Sheet Credit Related Financial Instruments	Off-Balance Sheet Credit Related Financial Instruments In the ordinary course of business, the Company has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded when they are funded.
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. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. Interest and/or penalties related to income taxes are reported as a component of non-interest income. Share-Based Compensation Compensation costs is recognized for stock options and restricted stock awards issued to employees and directors, based on the fair value of the awards at the date of grant. The estimate of the fair value of stock options and performance based restricted awards are based on a Black-Scholes or Monte Carlo model, respectively, while the market price of the common stock at the date of grant is used for time based restricted awards. Compensation cost is recognized over the required service period, generally defined as the vesting or measurement period. The Company’s accounting policy is to recognize forfeitures as they occur.
Earnings per Share	Earnings per Share Basic earnings per share represents income available to common shareholders divided by the weighted-average number of common shares outstanding during the period. There are no unvested share-based payment awards that contain rights to nonforfeitable dividends (participating securities). Diluted earnings per share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustments to income that would result from assumed issuance. Potential common shares that may be issued by the Company relate solely from outstanding stock options and restricted stock units, and are determined using the treasury stock method.
Revenue Recognition	Revenue Recognition The Company records revenue from contracts with customers in accordance with Accounting Standards Codification Topic 606, “Revenue from Contracts with Customers” (“Topic 606”). Under Topic 606, the Company must identify the contract with a customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue when (or as) the Company satisfies a performance obligation. Most of our revenue-generating transactions are not subject to Topic 606, including revenue generated from financial instruments, such as our loans and investment securities. In addition, certain non-interest income streams such as fees associated with mortgage servicing rights, financial guarantees, derivatives, and certain credit card fees are also not in scope of the new guidance. The Company’s non-interest revenue streams are largely based on transactional activity, or standard month-end revenue accruals such as asset management fees based on month-end market values. Consideration is often received immediately or shortly after the Company satisfies its performance obligation and revenue is recognized. The Company does not typically enter into long-term revenue contracts with customers, and therefore, does not experience significant contract balances. As of December 31, 2019 and December 31, 2018, the Company did not have any significant contract balances. The Company has evaluated the nature of its revenue streams and determined that further disaggregation of revenue into more granular categories beyond what is presented in Note 18 was not necessary. The following are descriptions of revenues within the scope of ASC 606. Deposit service charges The Company earns fees from its deposit customers for account maintenance, transaction-based and overdraft services. Account maintenance fees consist primarily of account fees and analyzed account fees charged on deposit accounts on a monthly basis. The performance obligation is satisfied and the fees are recognized on a monthly basis as the service period is completed. Transaction-based fees on deposit accounts are charged to deposit customers for specific services provided to the customer, such as non-sufficient funds fees, overdraft fees, and wire fees. The performance obligation is completed as the transaction occurs and the fees are recognized at the time each specific service is provided to the customer. Debit and ATM interchange fee income and expenses Debit and ATM interchange income represent fees earned when a debit card issued by the Company is used. The Company earns interchange fees from debit cardholder transactions through the Visa payment network. Interchange fees from cardholder transactions represent a percentage of the underlying transaction value and are recognized daily, concurrently with the transaction processing services provided to the cardholder. The performance obligation is satisfied and the fees are earned when the cost of the transaction is charged to the cardholders’ debit card. Certain expenses directly associated with the credit and debit card are recorded on a net basis with the interchange income. Commission on sale of non-deposit investment products Commissions on sale of non-deposit investment products consist of fees earned from advisory asset management, trade execution and administrative fees from investments. Advisory asset management fees are variable, since they are based on the underlying portfolio value, which is subject to market conditions and asset flows. Advisory asset management fees are recognized quarterly and are based on the portfolio values at the end of each quarter. Brokerage accounts are charged commissions at the time of a transaction and the commission schedule is based upon the type of security and quantity. In addition, revenues are earned from selling insurance and annuity policies. The amount of revenue earned is determined by the value and type of each instrument sold and is recognized at the time the policy or contract is written. Merchant fee income Merchant fee income represents fees earned by the Company for card payment services provided to its merchant customers. The Company outsources these services to a third party to provide card payment services to these merchants. The third party provider passes the payments made by the merchants through to the Company. The Company, in turn, pays the third party provider for the services it provides to the merchants. These payments to the third party provider are recorded as expenses as a net reduction against fee income. In addition, a portion of the payment received represents interchange fees which are passed through to the card issuing bank. Income is primarily earned based on the dollar volume and number of transactions processed. The performance obligation is satisfied and the related fee is earned when each payment is accepted by the processing network. Gain/loss on other real estate owned, net The Company records a gain or loss from the sale of other real estate owned when control of the property transfers to the buyer, which generally occurs at the time of an executed deed of trust. When the Company finances the sale of other real estate owned to the buyer, the Company assesses whether the buyer is committed to perform their obligations under the contract and whether collectability of the transaction price is probable. Once these criteria are met, the other real estate owned asset is derecognized and the gain or loss on sale is recorded upon the transfer of control of the property to the buyer. In determining the gain or loss on sale, the Company adjusts the transaction price and related gain or loss on sale if a significant financing component is present.
Reclassifications	Reclassifications Certain amounts reported in previous consolidated financial statements have been reclassified and recalculated to conform to the presentation in this report. These reclassifications did not affect previously reported amounts of net income, total assets or total shareholders’ equity.
Accounting Standards Adopted in 2019	Accounting Standards Adopted in 2019 The Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases (Topic 842). ASU 2016-02, which among other things, requires lessees to recognize most leases on-balance sheet, increasing reported assets and liabilities. Lessor accounting remains substantially similar to current U.S. GAAP. The FASB has issued incremental guidance to Topic 842 standard through ASU No. 2018-11, 2018-20, and 2019-01. The Company has elected to use the transition relief approach as provided in ASU 2018-11, which permits the Company to use January 1, 2019 as both the application date and the adoption date, rather than the modified retrospective approach which would have required an application date of January 1, 2017 and adoption date of January 1, 2019. The Company also elected certain relief options offered within the new standard, which include the package of practical expedients, the option not to recognize a right-of-use asset (ROUA) and lease liability that arise from short-term leases (i.e. leases with terms of 12 months or less), and the option of hindsight when determining lease term. Substantially all of the Company’s lease agreements are considered operating leases and were not previously recognized on the Company’s balance sheets. As of January 1, 2019, the Company recorded a ROUA and corresponding lease liability for all applicable operating leases. While the guidance increased the Company’s gross assets and liabilities, the adoption of ASU 2016-02 did not have a material impact on the consolidated statements of income or the consolidated statements of cash flows. See Note 11 for more information. FASB issued ASU 2017-8, Receivables—Nonrefundable Fees and Other Costs (Topic 310). ASU 2017-8 shortens the amortization period for certain callable debt securities held at a premium to require such premiums to be amortized to the earliest call date unless applicable guidance related to certain pools of securities is applied to consider estimated prepayments. Under prior guidance, entities were generally required to amortize premiums on individual, non-pooled callable debt securities as a yield adjustment over the contractual life of the security. ASU 2017-8 does not change the accounting for callable debt securities held at a discount. ASU 2017-8 was effective for the Company on January 1, 2019, and did not have a significant impact on the Company’s consolidated financial statements.
Accounting Standards Pending Adoption	Accounting Standards Pending Adoption FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326) . ASU 2016-13 is the final guidance on the new current expected credit loss (‘‘CECL’’) model. ASU 2016-13 requires the incurred loss impairment methodology in current GAAP be replaced with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to estimate future credit loss estimates. As CECL encompasses all financial assets carried at amortized cost, the requirement that reserves be established based on an organization’s reasonable and supportable estimate of expected credit losses extends to held to maturity (‘‘HTM’’) debt securities. ASU 2016-13 amends the accounting for credit losses on available-for-sale securities (‘‘AFS’’), whereby credit losses will be presented as an allowance as opposed to a write-down. In addition, CECL will modify the accounting for purchased loans with credit deterioration since origination, so that reserves are established at the date of acquisition for purchased loans. Lastly, ASU 2016-13 requires enhanced disclosures on the significant estimates and judgments used to estimate credit losses, as well as on the credit quality and underwriting standards of an organization’s portfolio. These disclosures require organizations to present the currently required credit quality disclosures disaggregated by the year of origination or vintage. ASU 2016-13 allows for a modified retrospective approach with a cumulative effect adjustment to the balance sheet upon adoption (charge to retained earnings instead of the income statement). ASU 2016-13 is effective for the Company as of January 1, 2020. Management has taken steps to prepare for the implementation requirements of this standard, such as forming an internal task force, gathering pertinent data, consulting with outside professionals, and evaluating its current IT systems. Based on the loan portfolio composition, characteristics and quality of the loan portfolio as of December 31, 2019, and the current economic environment, management estimates that the total allowance for loan losses will increase from $30,616,000 to approximately $42,000,000 to $50,000,000, or an increase of $11,384,000 to $19,384,000. The estimated decline in equity, net of tax, will range from $8,020,000 to $13,655,000. This increase includes the new requirement to include expected losses on purchased credit-deteriorated loans within the allowance for loan losses. The economic conditions, forecasts and assumptions used in the model could be significantly different in future periods. The impact of the change in the allowance on our results of operations in a provision for credit losses will depend on the current period net charge-offs, level of loan originations, and change in mix of the loan portfolio. The ranges noted above exclude any impact to the Company's reserve for unfunded commitments, which management does not believe the adoption of CECL will have a significant impact. As time progresses and the results of economic conditions require model assumption inputs to change, further refinements to the estimation process may also be identified. In addition, detailed and thorough disclosures are in process of being developed to explain the complexity of this estimate and to aid users of the financial statements in making informed decisions. The held-to-maturity (HTM) investment security portfolio consists of investment securities where payment performance has an implicit or explicit guarantee from the U.S. government and where no history of credit losses exist, management believes that indicators for zero loss are present and therefore, no loss reserves are anticipated to result from the adoption and implementation of the CECL standard for these assets. Management has separately evaluated its HTM investment securities from obligations of state and political subdivisions utilizing the historical loss data represented by similar securities over a period of time spanning nearly 50 years. Based on this evaluation, management has determined that the expected credit losses associated with these securities is less than significant for financial reporting purposes and therefore, no loss reserves are anticipated to result from the adoption and implementation of the CECL standard. FASB issued ASU No. 2017-4, Intangibles—Goodwill and Other: Simplifying the Test for Goodwill Impairment (Topic 350): ASU 2017-4 eliminates step two of the goodwill impairment test (the hypothetical purchase price allocation used to determine the implied fair value of goodwill) when step one (determining if the carrying value of a reporting unit exceeds its fair value) is failed. Instead, entities simply will compare the fair value of a reporting unit to its carrying amount and record goodwill impairment for the amount by which the reporting unit’s carrying amount exceeds its fair value. ASU 2017-4 is effective for the Company on January 1, 2020 and is not expected to have a significant impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13 , “Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU eliminates, adds and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU 2018-13 is effective January 1, 2020 and only revises disclosure requirements, as such it will not have a significant impact on the Company’s consolidated financial statements.

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Schedule of Fair Value of Consideration Transferred, Identifiable Net Assets Acquired and Resulting Goodwill	The following table summarizes the consideration paid for FNBB and the amounts of assets acquired and liabilities assumed that were recorded at the acquisition date (in thousands). FNB Bancorp Fair value of consideration transferred: Fair value of shares issued $ 284,437 Cash consideration 6,695 Total fair value of consideration transferred 291,132 Assets acquired: Cash and cash equivalents 37,308 Securities available for sale 335,667 Restricted equity securities 7,723 Loans 834,683 Premises and equipment 30,522 Cash value of life insurance 16,817 Core deposit intangible 27,605 Other assets 16,214 Total assets acquired 1,306,539 Liabilities assumed: Deposits 991,935 Other liabilities 15,033 Short-term borrowings—Federal Home Loan Bank 165,000 Total liabilities assumed 1,171,968 Total net assets acquired 134,571 Goodwill recognized $ 156,561
Summary of Estimated Fair Value Adjustments Resulting in Goodwill	A summary of the estimated fair value adjustments resulting in the goodwill recorded in the FNB Bancorp acquisition are presented below (in thousands): FNB Bancorp Value of stock consideration paid to FNB Bancorp Shareholders $ 284,437 Cash consideration 6,695 Less: Cost basis net assets acquired 114,030 Fair value adjustments: Investments (1,081) Loans (22,390) Premises and Equipment 21,590 Core deposit intangible 27,327 Deferred income taxes (6,394) Other 1,489 Goodwill $ 156,561
Schedule of Business Acquisition Pro-forma financial Information	The unaudited pro forma financial information is not necessarily indicative of the results of operations that would have occurred had the transaction been effected on the assumed date. Year ended December 31, 2018 December 31, 2017 (in thousands, except per share data) Summarized proforma income statement data: Net interest income $ 242,793 $ 227,795 (Provision for) benefit from loan losses (2,180) 271 Noninterest income 51,152 53,881 Noninterest expense (180,884) (181,833) Income before taxes 110,881 100,114 Income taxes (30,337) (47,352) Net income $ 80,544 $ 52,762 Basic earnings per share $ 2.65 $ 1.74 Diluted earnings per share $ 2.63 $ 1.72

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2019
Investments Schedule [Abstract]
Amortized Cost and Estimated Fair Values of Investments Securities	The amortized cost and estimated fair values of investment securities classified as available for sale and held to maturity are summarized in the following tables: December 31, 2019 Amortized Gross Gross Estimated (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 466,139 $ 7,261 $ (420) $ 472,980 Obligations of states and political subdivisions 106,373 3,229 (1) 109,601 Corporate bonds 2,430 102 — 2,532 Asset backed securities 371,809 129 (6,913) 365,025 Total debt securities available for sale $ 946,751 $ 10,721 $ (7,334) $ 950,138 Debt Securities Held to Maturity Obligations of U.S. government agencies 361,785 6,072 (480) 367,377 Obligations of states and political subdivisions 13,821 327 — 14,148 Total debt securities held to maturity $ 375,606 $ 6,399 $ (480) $ 381,525 December 31, 2018 Amortized Gross Gross Estimated (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 647,288 $ 771 $ (18,078) $ 629,981 Obligations of states and political subdivisions 128,890 294 (3,112) 126,072 Corporate bonds 4,381 97 — 4,478 Asset backed securities 355,451 73 (1,019) 354,505 Total debt securities available for sale $ 1,136,010 $ 1,235 $ (22,209) $ 1,115,036 Debt Securities Held to Maturity Obligations of U.S. government agencies $ 430,343 $ 327 $ (7,745) $ 422,925 Obligations of states and political subdivisions 14,593 82 (230) 14,445 Total debt securities held to maturity $ 444,936 $ 409 $ (7,975) $ 437,370
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity	The amortized cost and estimated fair value of debt securities at December 31, 2019 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. At December 31, 2019, obligations of U.S. government and agencies with an amortized cost basis totaling $827,924,000 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 December 31, 2019, the Company estimates the average remaining life of these mortgage-backed securities issued by U.S. government corporations and agencies to be approximately 4.9 years. Average remaining life is defined as the time span after which the principal balance has been reduced by half. Debt Securities Available for Sale Held to Maturity (In thousands) Amortized Estimated Amortized Estimated Due in one year $ 607 $ 611 $ 1,271 $ 1,280 Due after one year through five years 14,853 15,204 — — Due after five years through ten years 91,635 91,739 21,366 21,639 Due after ten years 839,656 842,584 352,969 358,606 Totals $ 946,751 $ 950,138 $ 375,606 $ 381,525
Gross Unrealized Losses on Investment Securities	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 December 31, 2019 (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 36,709 $ (309) $ 23,852 $ (111) $ 60,561 $ (420) Obligations of states and political subdivisions 778 (1) — — 778 (1) Asset backed securities 237,463 (4,535) 99,981 (2,378) 337,444 (6,913) Total debt securities available for sale $ 274,950 $ (4,845) $ 123,833 $ (2,489) $ 398,783 $ (7,334) Debt Securities Held to Maturity Obligations of U.S. government agencies $ 18,813 $ (142) $ 62,952 $ (338) $ 81,765 $ (480) Obligations of states and political subdivisions — — — — — — Total debt securities held to maturity $ 18,813 $ (142) $ 62,952 $ (338) $ 81,765 $ (480) Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized December 31, 2018 (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 171,309 $ (3,588) $ 394,630 $ (14,490) $ 565,939 $ (18,078) Obligations of states and political subdivisions 63,738 (1,541) 20,719 (1,571) 84,457 (3,112) Asset backed securities 101,386 (1,019) — — 101,386 (1,019) Total securities available for sale $ 336,433 $ (6,148) $ 415,349 $ (16,061) $ 751,782 $ (22,209) Debt Securities Held to Maturity Obligations of U.S. government agencies $ 223,810 $ (2,619) $ 158,648 $ (5,126) $ 382,458 $ (7,745) Obligations of states and political subdivisions 5,786 (114) 4,042 (116) 9,828 (230) Total debt securities held to maturity $ 229,596 $ (2,733) $ 162,690 $ (5,242) $ 392,286 $ (7,975)

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Summary of Loan Balances	A summary of loan balances follows (in thousands): December 31, 2019 Originated PNCI PCI Total Mortgage loans on real estate: Residential 1-4 family $ 373,101 $ 134,994 $ 1,413 $ 509,508 Commercial 2,221,217 592,244 5,321 2,818,782 Total mortgage loans on real estate 2,594,318 727,238 6,734 3,328,290 Consumer: Home equity lines of credit 299,454 34,057 789 334,300 Home equity loans 25,343 2,829 414 28,586 Other 67,896 14,758 2 82,656 Total consumer loans 392,693 51,644 1,205 445,542 Commercial 262,581 18,649 2,477 283,707 Construction: Residential 191,681 11,285 — 202,966 Commercial 46,422 439 — 46,861 Total construction 238,103 11,724 — 249,827 Total loans, net of deferred loan fees and discounts $ 3,487,695 $ 809,255 $ 10,416 $ 4,307,366 Total principal balance of loans owed, net of charge-offs $ 3,496,622 $ 838,425 $ 16,678 $ 4,351,725 Unamortized net deferred loan fees (8,927) — — (8,927) Discounts to principal balance of loans owed, net of charge-offs — (29,170) (6,262) (35,432) Total loans, net of deferred loan fees and discounts $ 3,487,695 $ 809,255 $ 10,416 $ 4,307,366 Allowance for loan losses $ (30,110) $ (500) $ (6) $ (30,616) December 31, 2018 Originated PNCI PCI Total Mortgage loans on real estate: Residential 1-4 family $ 343,796 $ 169,792 $ 1,674 $ 515,262 Commercial 1,910,981 708,401 8,456 2,627,838 Total mortgage loan on real estate 2,254,777 878,193 10,130 3,143,100 Consumer: Home equity lines of credit 284,453 40,957 1,167 326,577 Home equity loans 32,660 3,585 439 36,684 Other 34,020 21,659 42 55,721 Total consumer loans 351,133 66,201 1,648 418,982 Commercial 228,635 45,468 2,445 276,548 Construction: Residential 90,703 30,593 — 121,296 Commercial 56,208 5,880 — 62,088 Total construction 146,911 36,473 — 183,384 Total loans, net of deferred loan fees and discounts $ 2,981,456 $ 1,026,335 $ 14,223 $ 4,022,014 Total principal balance of loans owed, net of charge-offs $ 2,991,324 $ 1,062,655 $ 21,265 $ 4,075,244 Unamortized net deferred loan fees (9,868) — — (9,868) Discounts to principal balance of loans owed, net of charge-offs — (36,320) (7,042) (43,362) Total loans, net of unamortized deferred loan fees and discounts $ 2,981,456 $ 1,026,335 $ 14,223 $ 4,022,014 Allowance for loan losses $ (31,793) $ (667) $ (122) $ (32,582)
Change in Accretable Yield for PCI	The following is a summary of the change in accretable yield for PCI loans during the periods indicated (in thousands): Year ended December 31, 2019 2018 2017 Change in accretable yield: Balance at beginning of period $ 6,059 $ 6,137 $ 7,670 Accretion to interest income (852) (787) (2,809) Reclassification from non-accretable difference 1,012 709 1,276 Balance at end of period $ 6,219 $ 6,059 $ 6,137

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2019
Allowance For Loan And Lease Losses [Abstract]
Summary of Activity in Allowance for Loan Losses, and Ending Balance of Loans, Net of Unearned Fees for Periods Indicated	Allowance for Loan Losses - December 31, 2019 (in thousands) Beginning Charge-offs Recoveries Provision Ending Balance Mortgage loans on real estate: Residential 1-4 family $ 2,676 $ (2) $ 54 $ (422) $ 2,306 Commercial 12,944 (746) 1,528 (1,731) 11,995 Total mortgage loans on real estate 15,620 (748) 1,582 (2,153) 14,301 Consumer: Home equity lines of credit 6,042 — 504 (974) 5,572 Home equity loans 1,540 (3) 431 (1,357) 611 Other 793 (765) 321 1,246 1,595 Total consumer loans 8,375 (768) 1,256 (1,085) 7,778 Commercial 6,090 (2,123) 525 657 5,149 Construction: Residential 1,834 — — 1,236 3,070 Commercial 663 — — (345) 318 Total construction 2,497 — — 891 3,388 Total $ 32,582 $ (3,639) $ 3,363 $ (1,690) $ 30,616 Allowance for Loan Losses – As of December 31, 2019 (in thousands) Loans pooled Individually Loans acquired Total allowance Mortgage loans on real estate: Residential 1-4 family $ 2,257 $ 49 $ — $ 2,306 Commercial 11,917 78 — 11,995 Total mortgage loans on real estate 14,174 127 — 14,301 Consumer: Home equity lines of credit 5,451 115 6 5,572 Home equity loans 567 44 — 611 Other 1,576 19 — 1,595 Total consumer loans 7,594 178 6 7,778 Commercial 4,519 630 — 5,149 Construction: Residential 3,070 — — 3,070 Commercial 318 — — 318 Total construction 3,388 — — 3,388 Total $ 29,675 $ 935 $ 6 $ 30,616 Loans, Net of Unearned fees – As of December 31, 2019 (in thousands) Loans pooled Individually Loans acquired Total loans, net Mortgage loans on real estate: Residential 1-4 family $ 503,021 $ 5,074 $ 1,413 $ 509,508 Commercial 2,804,812 8,649 5,321 2,818,782 Total mortgage loans on real estate 3,307,833 13,723 6,734 3,328,290 Consumer: Home equity lines of credit 331,437 2,074 789 334,300 Home equity loans 26,522 1,650 414 28,586 Other 82,514 140 2 82,656 Total consumer loans 440,473 3,864 1,205 445,542 Commercial 278,900 2,330 2,477 283,707 Construction: Residential 202,966 — — 202,966 Commercial 46,861 — — 46,861 Total construction 249,827 — — 249,827 Total $ 4,277,033 $ 19,917 $ 10,416 $ 4,307,366 Allowance for Loan Losses – Year Ended December 31, 2018 (in thousands) Beginning Charge-offs Recoveries Provision Ending Balance Mortgage loans on real estate: Residential 1-4 family $ 2,317 $ (77) $ — $ 436 $ 2,676 Commercial 11,441 (15) 68 1,450 12,944 Total mortgage loans on real estate 13,758 (92) 68 1,886 15,620 Consumer: Home equity lines of credit 5,800 (277) 846 (327) 6,042 Home equity loans 1,841 (24) 297 (574) 1,540 Other 586 (783) 288 702 793 Total consumer loans 8,227 (1,084) 1,431 (199) 8,375 Commercial 6,512 (1,188) 541 225 6,090 Construction: Residential 1,184 — — 650 1,834 Commercial 642 — — 21 663 Total construction 1,826 — — 671 2,497 Total $ 30,323 $ (2,364) $ 2,040 $ 2,583 $ 32,582 Allowance for Loan Losses – As of December 31, 2018 (in thousands) Loans Individually Loans acquired Total allowance Mortgage loans on real estate: Residential 1-4 family $ 2,620 $ 56 $ — $ 2,676 Commercial 12,737 91 116 12,944 Total mortgage loans on real estate 15,357 147 116 15,620 Consumer: Home equity lines of credit 5,838 198 6 6,042 Home equity loans 1,486 54 — 1,540 Other 779 14 — 793 Total consumer loans 8,103 266 6 8,375 Commercial 4,309 1,781 — 6,090 Construction: Residential 1,834 — — 1,834 Commercial 663 — — 663 Total construction 2,497 — — 2,497 Total $ 30,266 $ 2,194 $ 122 $ 32,582 Loans, Net of Unearned fees – As of December 31, 2018 (in thousands) Loans Individually Loans acquired Total allowance Mortgage loans on real estate: Residential 1-4 family $ 509,267 $ 4,321 $ 1,674 $ 515,262 Commercial 2,606,819 12,563 8,456 2,627,838 Total mortgage loans on real estate 3,116,086 16,884 10,130 3,143,100 Consumer: Home equity lines of credit 322,764 2,646 1,167 326,577 Home equity loans 33,142 3,103 439 36,684 Other 55,483 196 42 55,721 Total consumer loans 411,389 5,945 1,648 418,982 Commercial 268,885 5,218 2,445 276,548 Construction: Residential 121,296 — — 121,296 Commercial 62,088 — — 62,088 Total construction 183,384 — — 183,384 Total $ 3,979,744 $ 28,047 $ 14,223 $ 4,022,014 Allowance for Loan Losses – Year Ended December 31, 2017 (in thousands) Beginning Charge-offs Recoveries Provision Ending Balance Mortgage loans on real estate: Residential 1-4 family $ 2,748 $ (60) $ — $ (371) $ 2,317 Commercial 11,517 (186) 397 (287) 11,441 Total mortgage loans on real estate 14,265 (246) 397 (658) 13,758 Consumer: Home equity lines of credit 7,044 (98) 698 (1,844) 5,800 Home equity loans 2,644 (332) 242 (713) 1,841 Other 622 (1,186) 375 775 586 Total consumer loans 10,310 (1,616) 1,315 (1,782) 8,227 Commercial 5,831 (1,444) 428 1,697 6,512 Construction: Residential 1,417 (1,104) — 871 1,184 Commercial 680 — 1 (39) 642 Total construction 2,097 (1,104) 1 832 1,826 Total $ 32,503 $ (4,410) $ 2,141 $ 89 $ 30,323 Allowance for Loan Losses – As of December 31, 2017 (in thousands) Loans Individually Loans acquired Total allowance Mortgage loans on real estate: Residential 1-4 family $ 1,932 $ 230 $ 155 $ 2,317 Commercial 11,351 30 60 11,441 Total mortgage loans on real estate 13,283 260 215 13,758 Consumer: Home equity lines of credit 5,356 427 17 5,800 Home equity loans 1,734 107 — 1,841 Other 529 57 — 586 Total consumer loans 7,619 591 17 8,227 Commercial 4,624 1,848 40 6,512 Construction: Residential 1,184 — — 1,184 Commercial 642 — — 642 Total construction 1,826 — — 1,826 Total $ 27,352 $ 2,699 $ 272 $ 30,323 Loans, Net of Unearned fees – As of December 31, 2017 (in thousands) Loans pooled Individually Loans acquired Total Loans Mortgage loans on real estate: Residential 1-4 family $ 378,743 $ 5,298 $ 1,385 $ 385,426 Commercial 1,892,422 13,911 8,563 1,914,896 Total mortgage loans on real estate 2,271,165 19,209 9,948 2,300,322 Consumer: Home equity lines of credit 283,502 2,688 2,498 288,688 Home equity loans 41,076 1,470 485 43,031 Other 24,853 257 45 25,155 Total consumer loans 349,431 4,415 3,028 356,874 Commercial 213,358 4,470 2,584 220,412 Construction: Residential 67,790 140 — 67,930 Commercial 69,627 — — 69,627 Total construction 137,417 140 — 137,557 Total $ 2,971,371 $ 28,234 $ 15,560 $ 3,015,165
Schedule Credit Quality Indicators	Credit Quality Indicators Originated Loans – As of December 31, 2019 (in thousands) Pass Special Substandard Doubtful / Loss Total Originated Mortgage loans on real estate: Residential 1-4 family $ 366,149 $ 2,497 $ 4,455 $ — $ 373,101 Commercial 2,185,961 24,485 10,771 — 2,221,217 Total mortgage loans on real estate 2,552,110 26,982 15,226 — 2,594,318 Consumer: Home equity lines of credit 293,432 3,332 2,690 — 299,454 Home equity loans 22,318 1,192 1,833 — 25,343 Other 67,422 373 101 — 67,896 Total consumer loans 383,172 4,897 4,624 — 392,693 Commercial 254,554 3,826 4,201 262,581 Construction: Residential 191,434 — 247 — 191,681 Commercial 46,105 317 — — 46,422 Total construction 237,539 317 247 — 238,103 Total loans $ 3,427,375 $ 36,022 $ 24,298 $ — $ 3,487,695 Credit Quality Indicators PNCI Loans – As of December 31, 2019 (in thousands) Pass Special Substandard Doubtful / Loss Total PNCI Mortgage loans on real estate: Residential 1-4 family $ 131,820 $ 2,217 $ 957 $ — $ 134,994 Commercial 584,829 573 6,842 — 592,244 Total mortgage loans on real estate 716,649 2,790 7,799 — 727,238 Consumer: Home equity lines of credit 32,096 857 1,104 — 34,057 Home equity loans 2,774 — 55 — 2,829 Other 14,390 346 22 — 14,758 Total consumer loans 49,260 1,203 1,181 — 51,644 Commercial 18,602 1 46 — 18,649 Construction: Residential 7,083 4,202 — — 11,285 Commercial 439 — — — 439 Total construction 7,522 4,202 — — 11,724 Total loans $ 792,033 $ 8,196 $ 9,026 $ — $ 809,255 Credit Quality Indicators Originated Loans – As of December 31, 2018 (in thousands) Pass Special Substandard Doubtful / Loss Total Originated Mortgage loans on real estate: Residential 1-4 family $ 337,189 $ 1,724 $ 4,883 $ — $ 343,796 Commercial 1,861,627 33,483 15,871 — 1,910,981 Total mortgage loans on real estate 2,198,816 35,207 20,754 — 2,254,777 Consumer: Home equity lines of credit 279,491 2,309 2,653 — 284,453 Home equity loans 29,289 1,054 2,317 — 32,660 Other 33,606 341 73 — 34,020 Total consumer loans 342,386 3,704 5,043 — 351,133 Commercial 217,126 6,127 5,382 — 228,635 Construction: Residential 90,412 32 259 — 90,703 Commercial 55,863 345 — — 56,208 Total construction 146,275 377 259 — 146,911 Total loans $ 2,904,603 $ 45,415 $ 31,438 $ — $ 2,981,456 Credit Quality Indicators PNCI Loans – As of December 31, 2018 (in thousands) Pass Special Substandard Doubtful / Loss Total PNCI Mortgage loans on real estate: Residential 1-4 family $ 167,908 $ 1,086 $ 798 $ — $ 169,792 Commercial 701,868 3,085 3,448 — 708,401 Total mortgage loans on real estate 869,776 4,171 4,246 — 878,193 Consumer: Home equity lines of credit 38,780 1,124 1,053 — 40,957 Home equity loans 3,413 74 98 — 3,585 Other 21,481 173 5 — 21,659 Total consumer loans 63,674 1,371 1,156 — 66,201 Commercial 45,027 321 120 — 45,468 Construction: Residential 30,593 — — — 30,593 Commercial 5,880 — — — 5,880 Total construction 36,473 — — — 36,473 Total $ 1,014,950 $ 5,863 $ 5,522 $ — $ 1,026,335
Analysis of Past Due Loans	Analysis of Originated Past Due Loans - As of December 31, 2019 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 60 $ 65 $ 1,957 $ 2,082 $ 371,019 $ 373,101 $ — Commercial 30 136 293 459 2,220,758 2,221,217 — Total mortgage loans on real estate 90 201 2,250 2,541 2,591,777 2,594,318 — Consumer: Home equity lines of credit — 93 712 805 298,649 299,454 — Home equity loans 36 216 132 384 24,959 25,343 — Other 120 — 4 124 67,772 67,896 — Total consumer loans 156 309 848 1,313 391,380 392,693 — Commercial 604 297 9 910 261,671 262,581 — Construction: Residential — — — — 191,681 191,681 — Commercial — — — — 46,422 46,422 — Total construction — — — — 238,103 238,103 — Total originated loans $ 850 $ 807 $ 3,107 $ 4,764 $ 3,482,931 $ 3,487,695 $ — Analysis of PNCI Past Due Loans - As of December 31, 2019 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ — $ 305 $ — $ 305 $ 134,689 $ 134,994 $ — Commercial 268 — 2,137 2,405 589,839 592,244 — Total mortgage loans on real estate 268 305 2,137 2,710 724,528 727,238 — Consumer: Home equity lines of credit 87 260 243 590 33,467 34,057 — Home equity loans 51 — — 51 2,778 2,829 — Other — — 19 19 14,739 14,758 19 Total consumer loans 138 260 262 660 50,984 51,644 19 Commercial — — 51 51 18,598 18,649 — Construction: Residential — — — — 11,285 11,285 — Commercial — — — — 439 439 — Total construction — — — — 11,724 11,724 — Total PNCI loans $ 406 $ 565 $ 2,450 $ 3,421 $ 805,834 $ 809,255 $ 19 Analysis of Originated Past Due Loans - As of December 31, 2018 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 1,675 $ 132 $ 478 $ 2,285 $ 341,511 $ 343,796 $ — Commercial 431 1,200 296 1,927 1,909,054 1,910,981 — Total mortgage loans on real estate 2,106 1,332 774 4,212 2,250,565 2,254,777 — Consumer: Home equity lines of credit 908 47 609 1,564 282,889 284,453 — Home equity loans 1,043 24 214 1,281 31,379 32,660 — Other 298 17 — 315 33,705 34,020 — Total consumer loans 2,249 88 823 3,160 347,973 351,133 — Commercial 1,053 579 1,247 2,879 225,756 228,635 — Construction: Residential 209 — — 209 90,494 90,703 — Commercial — — — — 56,208 56,208 — Total construction 209 — — 209 146,702 146,911 — Total loans $ 5,617 $ 1,999 $ 2,844 $ 10,460 $ 2,970,996 $ 2,981,456 $ — Analysis of PNCI Past Due Loans - As of December 31, 2018 (in thousands) 30-59 60-89 > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 1,009 $ 133 $ 156 $ 1,298 $ 168,494 $ 169,792 $ — Commercial 1,646 1,136 1,082 3,864 704,537 708,401 — Total mortgage loans on real estate 2,655 1,269 1,238 5,162 873,031 878,193 — Consumer: Home equity lines of credit 304 35 237 576 40,381 40,957 — Home equity loans 74 — — 74 3,511 3,585 — Other 160 — — 160 21,499 21,659 — Total consumer loans 538 35 237 810 65,391 66,201 — Commercial 678 145 113 936 44,532 45,468 — Construction: Residential — — — — 30,593 30,593 — Commercial — — — — 5,880 5,880 — Total construction — — — — 36,473 36,473 — Total loans $ 3,871 $ 1,449 $ 1,588 $ 6,908 $ 1,019,427 $ 1,026,335 $ —
Schedule of Non Accrual Loans	Non Accrual Loans As of December 31, 2019 As of December 31, 2018 (in thousands) Originated PNCI Total Originated PNCI Total Mortgage loans on real estate: Residential 1-4 family $ 3,547 $ 876 $ 4,423 $ 3,244 $ 334 $ 3,578 Commercial 2,702 2,403 5,105 9,263 1,468 10,731 Total mortgage loans on real estate 6,249 3,279 9,528 12,507 1,802 14,309 Consumer: Home equity lines of credit 1,254 548 1,802 1,429 885 2,314 Home equity loans 1,181 31 1,212 1,722 47 1,769 Other 29 2 31 3 4 7 Total consumer loans 2,464 581 3,045 3,154 936 4,090 Commercial 2,038 51 2,089 3,755 120 3,875 Construction: Residential — — — — — — Commercial — — — — — — Total construction — — — — — — Total non accrual loans $ 10,751 $ 3,911 $ 14,662 $ 19,416 $ 2,858 $ 22,274
Impaired Loans	Impaired Originated Loans - As of, or for the Twelve Months Ended, December 31, 2019 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 4,836 $ 3,434 $ 764 $ 4,198 $ 49 $ 4,388 $ 71 Commercial 6,543 4,401 1,845 6,246 78 9,343 86 Total mortgage loans on real estate 11,379 7,835 2,609 10,444 127 13,731 157 Consumer: Home equity lines of credit 1,315 1,267 1 1,268 1 1,679 35 Home equity loans 1,895 1,278 234 1,512 42 1,839 5 Other 47 3 25 28 7 33 2 Total consumer loans 3,257 2,548 260 2,808 50 3,551 42 Commercial 2,612 1,463 816 2,279 579 3,746 12 Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 17,248 $ 11,846 $ 3,685 $ 15,531 $ 756 $ 21,028 $ 211 Impaired PNCI Loans - As of, or for the Twelve Months Ended, December 31, 2019 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 945 $ 876 $ — $ 876 $ — $ 605 $ 9 Commercial 2,405 2,403 — 2,403 — 1,935 146 Total mortgage loans on real estate 3,350 3,279 — 3,279 — 2,540 155 Consumer: Home equity lines of credit 862 395 411 806 114 905 6 Home equity loans 159 20 118 138 2 189 — Other 112 59 53 112 12 111 — Total consumer loans 1,133 474 582 1,056 128 1,205 6 Commercial 59 — 51 51 51 86 — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 4,542 $ 3,753 $ 633 $ 4,386 $ 179 $ 3,831 $ 161 Impaired Originated Loans - As of, or for the Twelve Months Ended, December 31, 2018 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 4,594 $ 3,663 $ 308 $ 3,971 $ 56 $ 3,517 $ 90 Commercial 13,081 10,676 1,765 12,441 42 13,115 137 Total mortgage loans on real estate 17,675 14,339 2,073 16,412 98 16,632 227 Consumer: Home equity lines of credit 1,900 1,749 111 1,860 71 1,885 43 Home equity loans 2,374 1,892 65 1,957 2 1,520 23 Other 3 — 3 3 3 17 2 Total consumer loans 4,277 3,641 179 3,820 76 3,422 68 Commercial 5,433 2,924 2,287 5,211 1,774 4,654 91 Construction: Residential — — — — — 5 — Commercial — — — — — — — Total construction — — — — — 5 — Total $ 27,385 $ 20,904 $ 4,539 $ 25,443 $ 1,948 $ 24,713 $ 386 Impaired PNCI Loans - As of, or for the Twelve Months Ended, December 31, 2018 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 375 $ 334 $ — $ 334 $ — $ 529 $ 5 Commercial 3,110 1,468 — 1,468 — 1,713 183 Total mortgage loans on real estate 3,485 1,802 — 1,802 — 2,242 188 Consumer: Home equity lines of credit 1,027 587 367 954 127 1,120 18 Home equity loans 252 47 197 244 101 155 — Other 106 21 85 106 11 114 — Total consumer loans 1,385 655 649 1,304 239 1,389 18 Commercial 120 113 7 120 7 60 1 Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 4,990 $ 2,570 $ 656 $ 3,226 $ 246 $ 3,691 $ 207 Impaired Originated Loans - As of, or for the Twelve Months Ended, December 31, 2017 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 4,023 $ 2,058 $ 1,881 $ 3,939 $ 230 $ 3,501 $ 143 Commercial 14,186 13,101 810 13,911 30 13,851 645 Total mortgage loans on real estate 18,209 15,159 2,691 17,850 260 17,352 788 Consumer: Home equity lines of credit 1,581 1,093 401 1,494 111 1,702 47 Home equity loans 1,627 1,107 198 1,305 10 1,193 24 Other 55 4 3 7 3 20 — Total consumer loans 3,263 2,204 602 2,806 124 2,915 71 Commercial 4,566 575 3,895 4,470 1,848 4,283 184 Construction: Residential 140 140 — 140 — 76 9 Commercial — — — — — — — Total construction 140 140 — 140 — 76 9 Total $ 26,178 $ 18,078 $ 7,188 $ 25,266 $ 2,232 $ 24,626 $ 1,052 Impaired PNCI Loans - As of, or for the Twelve Months Ended, December 31, 2017 (in thousands) Unpaid Recorded Recorded Total recorded Related Average Interest income Mortgage loans on real estate: Residential 1-4 family $ 1,404 $ 1,359 $ — $ 1,359 $ — $ 1,041 $ 24 Commercial — — — — — 979 — Total mortgage loans on real estate 1,404 1,359 — 1,359 — 2,020 24 Consumer: Home equity lines of credit 1,216 591 603 1,194 316 1,240 48 Home equity loans 178 44 121 165 97 117 6 Other 250 — 250 250 54 186 11 Total consumer loans 1,644 635 974 1,609 467 1,543 65 Commercial — — — — — — — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 3,048 $ 1,994 $ 974 $ 2,968 $ 467 $ 3,563 $ 89
Troubled Debt Restructurings	The following tables show certain information regarding Troubled Debt Restructurings that occurred during the periods indicated: TDR Information for the Year Ended December 31, 2019 (dollars in thousands) Number Pre-mod Post-mod Financial Number that Recorded Financial impact Mortgage loans on real estate: Residential 1-4 family 3 $ 659 $ 662 $ 30 — $ — $ — Commercial 2 60 67 — — — — Total mortgage loans on real estate 5 719 729 30 — — — Consumer: Home equity lines of credit 1 65 68 — — — — Home equity loans 2 149 147 29 — — — Other — — — — — — — Total consumer loans 3 214 215 29 — — — Commercial 10 1,918 1,885 — 1 7 — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total 18 $ 2,851 $ 2,829 $ 59 1 $ 7 $ — TDR Information for the Year Ended December 31, 2018 (dollars in thousands) Number Pre-mod Post-mod Financial Number that Recorded Financial impact Mortgage loans on real estate: Residential 1-4 family 1 $ 156 $ 156 $ — — $ — $ — Commercial 7 1,782 1,779 491 1 169 — Total mortgage loans on real estate 8 1,938 1,935 491 1 169 — Consumer: Home equity lines of credit 1 133 138 — 2 248 — Home equity loans 2 599 599 (35) — — — Other — — — — — — — Total consumer loans 3 732 737 (35) 2 248 — Commercial 6 1,098 1,083 325 3 148 — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total 17 $ 3,768 $ 3,755 $ 781 6 $ 565 $ — TDR Information for the Year Ended December 31, 2017 (dollars in thousands) Number Pre-mod Post-mod Financial Number that Recorded Financial impact Mortgage loans on real estate: Residential 1-4 family 1 $ 939 $ 939 $ 169 2 $ 223 $ — Commercial 8 3,721 3,695 (111) 1 219 — Total mortgage loans on real estate 9 4,660 4,634 58 3 442 — Consumer: Home equity lines of credit 3 187 187 27 1 127 (5) Home equity loans 1 252 252 — 1 55 — Other 1 14 14 11 — — — Total consumer loans 5 453 453 38 2 182 (5) Commercial 11 1,854 1,747 37 — Construction: Residential 1 144 144 — — — — Commercial — — — — — — — Total construction 1 144 144 — — — — Total 26 $ 7,111 $ 6,978 $ 133 5 $ 624 $ (5)

Real Estate Owned (Tables)

Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2019
Repossessed Assets [Abstract]
Summary of Activity in Balance of Foreclosed Assets	A summary of the activity in the balance of real estate owned follows (dollars in thousands): Year ended December 31, 2019 2018 Beginning balance, net $ 2,280 $ 3,226 Additions/transfers from loans 1,249 1,262 Dispositions/sales (1,090) (2,119) Valuation adjustments 102 (89) Ending balance, net $ 2,541 $ 2,280 Ending valuation allowance $ (139) $ (116) Ending number of foreclosed assets 6 11 Proceeds from sale of real estate owned $ 1,336 $ 2,527 Gain on sale of real estate owned $ 246 $ 408

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	As of December 31, 2019 2018 (In thousands) Land and land improvements $ 29,453 $ 29,065 Buildings 65,241 64,478 Furniture and equipment 45,723 45,228 140,417 138,771 Less: Accumulated depreciation (53,704) (50,125) 86,713 88,646 Construction in progress 373 701 Total premises and equipment $ 87,086 $ 89,347

Cash Value of Life Insurance (T

Cash Value of Life Insurance (Tables)	12 Months Ended
	Dec. 31, 2019
Cash Value of Life Insurance [Abstract]
Summary of Activity in Balance of Cash Value of Life Insurance	A summary of the activity in the balance of cash value of life insurance follows (dollars in thousands): Year ended December 31, 2019 2018 Beginning balance $ 117,318 $ 97,783 Acquired policies from business combination — 16,817 Increase in cash value of life insurance 3,029 2,718 Gain on death benefit 831 — Insurance proceeds receivable reclassified to other assets (3,355) — Ending balance $ 117,823 $ 117,318 End of period death benefit $ 199,084 $ 200,249 Number of policies owned 189 196 Insurance companies used 14 14 Current and former employees and directors covered 63 66

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Goodwill Intangible	The following table summarizes the Company’s goodwill intangible as of the dates indicated: (in thousands) December 31, Additions Reductions December 31, Goodwill $ 220,872 $ — $ (100) $ 220,972
Summary of Core Deposit Intangibles	The following table summarizes the Company’s core deposit intangibles (“CDI”) as of the dates indicated: (in thousands) December 31, Additions Reductions/ December 31, Core deposit intangibles $ 37,163 $ — $ — $ 37,163 Accumulated amortization (13,606) — (5,723) (7,883) Core deposit intangibles, net $ 23,557 — $ (5,723) $ 29,280
Remaining Estimated Core Deposit Intangible Amortization	The following table summarizes the Company’s estimated core deposit intangible amortization (dollars in thousands): Years Ended Estimated CDI Amortization 2020 $ 5,723 2021 5,465 2022 4,776 2023 4,269 2024 2,482 Thereafter 842 $ 23,557

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2019
Mortgage Servicing Right [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 for the periods indicated (dollars in thousands): Year ended December 31, 2019 2018 2017 Balance at beginning of period $ 7,098 $ 6,687 $ 6,595 Additions 913 557 810 Change in fair value (1,811) (146) (718) Balance at end of period $ 6,200 $ 7,098 $ 6,687 Contractually specified servicing fees, late fees and ancillary fees earned $ 1,917 $ 2,038 $ 2,076 Balance of loans serviced at: Beginning of period $ 785,138 $ 811,065 $ 816,623 End of period $ 767,662 $ 785,138 $ 811,065 Period end: Weighted-average prepayment speed (CPR) 6.2 % 7.6 % 8.9 % Weighted-average discount rate 12.0 % 12.0 % 13.0 %

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Components of Lease Expense	The following table presents the components of lease expense for the period indicated (in thousands): Year ended December 31, 2019 Operating lease cost $ 5,228 Short-term lease cost 262 Variable lease cost (29) Sublease income (131) Total lease cost $ 5,330 Prior to the adoption of ASU 2016-2, rent expense under operating leases was $6,348,000 and $5,885,000 for years ended 2018 and 2017, respectively. Rent expense was offset by rent income of $42,000 and $44,000 during the same periods, respectively. The following table presents supplemental cash flow information related to leases for the twelve months ended December 31, 2019 (in thousands): Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 4,931 ROUA obtained in exchange for operating lease liabilities $ 32,162
Supplemental Cash Flow Information	The following table presents the components of lease expense for the period indicated (in thousands): Year ended December 31, 2019 Operating lease cost $ 5,228 Short-term lease cost 262 Variable lease cost (29) Sublease income (131) Total lease cost $ 5,330 Prior to the adoption of ASU 2016-2, rent expense under operating leases was $6,348,000 and $5,885,000 for years ended 2018 and 2017, respectively. Rent expense was offset by rent income of $42,000 and $44,000 during the same periods, respectively. The following table presents supplemental cash flow information related to leases for the twelve months ended December 31, 2019 (in thousands): Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 4,931 ROUA obtained in exchange for operating lease liabilities $ 32,162
Lease Term and Discount Rate	The following table presents the weighted average operating lease term and discount rate at December 31, 2019: Weighted-average remaining lease term 9.3 years Weighted-average discount rate 3.2 %
Expected Future Operating Lease Payments	At December 31, 2019, future expected operating lease payments are as follows (in thousands): Periods ending December 31, 2020 $ 4,388 2021 4,235 2022 3,896 2023 3,216 2024 2,937 Thereafter 13,745 32,417 Discount for present value of expected cash flows (4,877) Lease liability at December 31, 2019 $ 27,540

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2019
Deposits [Abstract]
Summary of Balances of Deposits	A summary of the balances of deposits follows (in thousands): December 31, 2019 2018 Noninterest-bearing demand $ 1,832,665 $ 1,760,580 Interest-bearing demand 1,242,274 1,252,366 Savings 1,851,549 1,921,324 Time certificates, $250,000 and over 129,061 132,429 Other time certificates 311,445 299,767 Total deposits $ 5,366,994 $ 5,366,466
Schedule of Maturities of Time Deposits	At December 31, 2019, the scheduled maturities of time deposits were as follows (in thousands): Scheduled 2020 $ 340,150 2021 57,076 2022 38,552 2023 2,798 2024 1,924 Thereafter 6 Total $ 440,506

Other Borrowings (Tables)

Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Summary of Balances of Other Borrowings	A summary of the balances of other borrowings follows: December 31, 2019 2018 (in thousands) Other collateralized borrowings, fixed rate, as of December 31, 2019 and 2018 of 0.05%, payable on January 2, 2020 and 2019, respectively $ 18,454 $ 15,839 Total other borrowings $ 18,454 $ 15,839

Junior Subordinated Debt (Table

Junior Subordinated Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [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 December 31, 2019 December 31, 2018 Subordinated Debt Series Maturity Face Current Recorded Recorded TriCo Cap Trust I 10/7/2033 $ 20,619 3.05 % 5.04 % $ 20,619 $ 20,619 TriCo Cap Trust II 7/23/2034 20,619 2.55 % 4.48 % 20,619 20,619 North Valley Trust II 4/24/2033 6,186 3.25 % 5.16 % 5,215 5,174 North Valley Trust III 4/24/2034 5,155 2.80 % 4.73 % 4,118 4,079 North Valley Trust IV 3/15/2036 10,310 1.33 % 3.22 % 6,661 6,551 $ 62,889 $ 57,232 $ 57,042

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Summary of Bank's Commitments and Contingent Liabilities	The following table presents a summary of the Bank’s commitments and contingent liabilities: December 31, (in thousands) 2019 2018 Financial instruments whose amounts represent risk: Commitments to extend credit: Commercial loans $ 363,793 $ 306,191 Consumer loans 533,576 496,575 Real estate mortgage loans 188,959 140,292 Real estate construction loans 222,998 248,996 Standby letters of credit 12,014 11,346 Deposit account overdraft privilege 110,402 111,956

Stock Options and Other Equit_2

Stock Options and Other Equity-Based Incentive Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Option Activity	he following table for the dates indicated: Number of Option Price Weighted Outstanding at January 1, 2018 446,400 $12.63 to $23.21 $ 16.84 Options granted — — — Options exercised (100,400) $12.63 to $23.21 $ 16.97 Options forfeited (3,000) $23.21 $ 23.21 Outstanding at December 31, 2018 343,000 $12.63 to $23.21 $ 16.67 Options granted — — — Options exercised (182,500) $12.63 to $19.46 $ 16.00 Options forfeited — — $ — Outstanding at December 31, 2019 160,500 $12.63 to $23.21 $ 17.60
Summary of Options Outstanding	The following table shows the number, weighted-average exercise price, intrinsic value, and weighted average remaining contractual life of options exercisable, options not yet exercisable and total options outstanding as of December 31, 2019: Currently Currently Not Total Number of options 160,500 — 160,500 Weighted average exercise price $ 17.60 $ — $ 17.60 Intrinsic value (in thousands) $ 3,726 $ — $ 3,726 Weighted average remaining contractual term (yrs.) 2.75 0 2.75
Information about Options	The following table shows the total intrinsic value of options exercised, the total fair value of options vested, total compensation costs for options recognized in income, total tax benefit and excess tax benefits recognized in income related to compensation costs for options during the periods indicated: Year Ended December 31, 2019 2018 2017 Intrinsic value of options exercised $ 4,169,000 $ 2,109,000 $ 2,657,000 Fair value of options that vested $ — $ 75,000 $ 259,000 Total compensation costs for options recognized in expense $ — $ 75,000 $ 259,000 Total tax benefit recognized in income related to compensation costs for options $ — $ 22,000 $ 109,000 Excess tax benefit recognized in income $ 1,233,000 $ 623,000 $ 600,000
Restricted Stock Unit (RSU) Activity	Restricted stock unit activity is summarized in the following table for the dates indicated: Service Condition Vesting RSUs Market Plus Service Condition Number Weighted Average Number of Weighted Average Outstanding at January 1, 2019 66,947 45,536 RSUs granted 35,273 $ 37.41 22,899 $ 31.60 Additional market plus service condition RSUs vested — 7,414 RSUs added through dividend credits 1,314 — RSUs released through vesting (33,060) (22,237) RSUs forfeited/expired (1,877) (2,300) Outstanding at December 31, 2019 68,597 51,312
Summary of Compensation Costs and Excess Tax Benefits for RSUs	The following table shows the compensation costs and excess tax benefits for RSUs recognized in income for the periods indicated: Year Ended December 31, 2019 2018 2017 Total compensation costs recognized in income Service condition vesting RSUs $ 1,161,237 $ 1,017,000 $ 895,000 Market plus service condition vesting RSUs $ 493,000 $ 370,000 $ 432,000 Excess tax benefit recognized in income Service condition vesting RSUs $ 141,000 $ 104,000 $ 131,000 Market plus service condition vesting RSUs $ 146,000 $ 191,000 $ 175,000

Noninterest Income and Expense

Noninterest Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2019
Other Income and Expenses [Abstract]
Components of Other Noninterest Income	The components of other non-interest income were as follows (in thousands): Year Ended December 31, 2019 2018 2017 ATM and interchange fees $ 20,639 $ 18,249 $ 16,727 Service charges on deposit accounts 16,657 15,467 16,056 Other service fees 3,015 2,852 3,282 Mortgage banking service fees 1,917 2,038 2,076 Change in value of mortgage loan servicing rights (1,811) (146) (718) Total service charges and fees 40,417 38,460 37,423 Commissions on sale of non-deposit investment products 2,877 3,151 2,729 Increase in cash value of life insurance 3,029 2,718 2,685 Gain on sale of loans 3,282 2,371 3,109 Lease brokerage income 878 678 782 Sale of customer checks 529 449 372 Gain on sale of investment securities 110 207 961 Gain (loss) on marketable equity securities 86 (64) — Other 2,312 1,091 1,391 Total other noninterest income 13,103 10,601 12,029 Total noninterest income $ 53,520 $ 49,061 $ 49,452
Components of Noninterest Expense	The components of noninterest expense were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Base salaries, net of deferred loan origination costs $ 70,218 $ 62,422 $ 54,589 Incentive compensation 13,106 11,147 9,227 Benefits and other compensation costs 22,741 20,373 19,114 Total salaries and benefits expense 106,065 93,942 82,930 Occupancy 14,893 12,139 10,894 Data processing and software 13,517 11,021 10,448 Equipment 7,022 6,651 7,141 ATM and POS network charges 5,447 5,271 4,752 Merger and acquisition expense — 5,227 530 Advertising 5,633 4,578 4,101 Professional fees 3,754 3,546 3,745 Intangible amortization 5,723 3,499 1,389 Telecommunications 3,190 3,023 2,713 Regulatory assessments and insurance 1,188 1,906 1,676 Courier service 1,308 1,287 1,035 Operational losses 986 1,260 1,394 Postage 1,258 1,154 1,296 Gain on sale of real estate owned (246) (408) (711) Loss on disposal of fixed assets 82 185 142 Other miscellaneous expense 15,637 14,191 12,980 Total other noninterest expense 79,392 74,530 63,525 Total noninterest expense $ 185,457 $ 168,472 $ 146,455

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Components of Consolidated Income Tax Expense	The components of consolidated income tax expense are as follows (in thousands): Year Ended December 31, 2019 2018 2017 Current tax expense Federal $ 20,403 $ 13,109 $ 17,835 State 12,655 9,323 6,650 $ 33,058 22,432 24,485 Deferred tax expense Federal 695 1,842 11,418 State 997 758 1,055 1,692 2,600 12,473 Total tax expense $ 34,750 $ 25,032 $ 36,958
Schedule of Components of Investments in Qualified Affordable Housing Projects	The Company recognized, as components of tax expense, tax credits and other tax benefits, and amortization expense relating to our investments in Qualified Affordable Housing Projects as follows for the periods indicated (in thousands): Year Ended December 31, 2019 2018 2017 Tax credits and other tax benefits – decrease in tax expense $ (2,546) $ (1,993) $ (1,753) Amortization – increase in tax expense $ 2,705 $ 1,814 $ 1,611
Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate	The effective tax rate and the statutory federal income tax rate are reconciled as follows: Year Ended December 31, 2019 2018 2017 Federal statutory income tax rate 21.0 % 21.0 % 35.0 % State income taxes, net of federal tax benefit 7.9 8.6 6.9 Tax Cuts and Jobs Act impact of federal rate change — — 9.6 Tax-exempt interest on municipal obligations (0.7) (1.0) (1.9) Tax-exempt life insurance related income (0.6) (0.6) (1.3) Low income housing tax credits (2.3) (2.2) (2.3) Low income housing tax credit amortization 2.1 2.0 2.1 Equity compensation (0.4) (0.4) (1.1) Non-deductible merger expenses — 0.2 0.2 Other 0.4 (0.8) 0.5 Effective Tax Rate 27.4 % 26.8 % 47.7 %
Company's Net Deferred Tax Asset Recorded in Other Assets	The temporary differences, tax effected, which give rise to the Company’s net deferred tax asset recorded in other assets are as follows as of December 31 for the years indicated (in thousands): December 31, 2019 2018 Deferred tax assets: Allowance for losses and reserve for unfunded commitments $ 9,871 $ 10,394 Deferred compensation 2,342 2,780 Accrued pension liability 3,309 9,734 Other accrued expenses 1,678 1,175 Additional unfunded status of the supplemental retirement plans 9,868 1,420 Operating lease liability 8,142 — State taxes 2,441 1,864 Share based compensation 803 1,132 Nonaccrual interest 649 814 Acquisition cost basis 4,556 6,714 Unrealized loss on securities — 6,201 Tax credits 576 623 Net operating loss carryforwards 1,578 2,442 Other 348 423 Total deferred tax assets 46,161 45,716 Deferred tax liabilities: Securities income (762) (1,020) Depreciation (6,109) (5,572) Right of use asset (8,242) — Merger related fixed asset valuations (30) (26) Securities accretion (560) (426) Mortgage servicing rights valuation (1,813) (2,073) Unrealized gain on securities (1,001) — Core deposit intangible (6,453) (8,234) Junior subordinated debt (1,672) (1,729) Prepaid expenses and other (469) (582) Total deferred tax liability (27,111) (19,662) Net deferred tax asset $ 19,050 $ 26,054

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Computation of Earnings Per Share	Earnings per share have been computed based on the following: Year Ended December 31, (in thousands) 2019 2018 2017 Net income $ 92,072 $ 68,320 $ 40,554 Average number of common shares outstanding 30,478 26,593 22,912 Effect of dilutive stock options and restricted stock 167 287 338 Average number of common shares outstanding used to calculate diluted earnings per share 30,645 26,880 23,250 Options excluded from diluted earnings per share because the effect of these options was antidilutive — 10,056 —

Comprehensive Income (Tables)

Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Components of Other Comprehensive Income (Loss) and Related Tax Effects	The components of other comprehensive income and related tax effects are as follows: Year Ended December 31, (in thousands) 2019 2018 2017 Unrealized holding gains (losses) on available for sale securities before reclassifications $ 24,471 $ (17,057) $ 6,422 Amounts reclassified out of accumulated other comprehensive income: Realized gains on debt securities (110) (207) (961) Adoption ASU 2016-01 — 62 — Adoption ASU 2018-02 — (425) — Total amounts reclassified out of accumulated other (110) (570) (961) Unrealized holding gains (losses) on available for sale securities after reclassifications 24,361 (17,627) 5,461 Tax effect (7,202) 5,193 (2,296) Unrealized holding gains (losses) on available for sale securities, net of tax 17,159 (12,434) 3,165 Change in unfunded status of the supplemental retirement plans before reclassifications (6,745) 762 (1,016) Amounts reclassified out of accumulated other comprehensive income: Amortization of prior service cost (54) (54) (12) Amortization of actuarial losses 408 510 390 Adoption ASU 2018-02 — (668) — Total amounts reclassified out of accumulated other 354 (212) 378 Change in unfunded status of the supplemental retirement plans after reclassifications (6,391) 550 (638) Tax effect 1,889 (162) 268 Change in unfunded status of the supplemental retirement plans, net of tax (4,502) 388 (370) Change in joint beneficiary agreement liability before reclassifications — 426 (110) Tax effect — — — Change in unfunded status of the supplemental retirement plans, net of tax — 426 (110) Total other comprehensive income (loss) $ 12,657 $ (11,620) $ 2,685
Components of Accumulated Other Comprehensive Loss	The components of accumulated other comprehensive income, included in shareholders’ equity, are as follows: Year Ended December 31, (in thousands) 2019 2018 Net unrealized gain (loss) on available for sale securities $ 3,387 (20,974) Tax effect (1,001) 6,201 Unrealized holding loss on available for sale securities, net of tax 2,386 (14,773) Unfunded status of the supplemental retirement plans (11,193) (4,802) Tax effect 3,309 1,420 Unfunded status of the supplemental retirement plans, net of tax (7,884) (3,382) Joint beneficiary agreement liability, net of tax 276 276 Accumulated other comprehensive loss $ (5,222) $ (17,879)

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Summary of 401(k) Contribution Plan	The Company recorded salaries & benefits expense attributable to the 401(k) Plan matching contributions and 401(k) Plan matching contributions for the years ended: Year Ended December 31, (in thousands) 2019 2018 2017 401(k) Plan benefits expense $ 1,119 $ 879 $ 776 401(k) Plan contributions made by the Company $ 1,003 $ 872 $ 767
Summary of ESOP Activities	Expenses related to the Company’s ESOP, included in benefits and other compensation costs under salaries and benefits expense, and contributions to the plan for the years ended were: Year Ended December 31, (in thousands) 2019 2018 2017 ESOP benefits expense $ 2,500 $ 1,887 $ 2,149 ESOP contributions made by the Company $ 1,875 $ 1,952 $ 2,073
Schedule of Deferred Compensation Earnings Credits Included in Noninterest Expense	Earnings credits on deferred balances included in non-interest expense are included in the following table: Year Ended December 31, (in thousands) 2019 2018 2017 Deferred compensation earnings credits included in non-interest expense $ 363 $ 462 $ 478
Defined Benefit Pension Plans	Amounts recognized as a component of accumulated other comprehensive loss as of year-end that have not been recognized as a component of the combined net period benefit cost of the Company’s defined benefit pension plans are presented in the following table. The Company expects to recognize approximately $2,984,000 of the net actuarial loss reported in the following table as of December 31, 2019 as a component of net periodic benefit cost during 2020. December 31, (in thousands) 2019 2018 Transition obligation $ 1 $ 3 Prior service cost (141) (194) Net actuarial loss 11,333 4,993 Amount included in accumulated other comprehensive loss 11,193 4,802 Deferred tax benefit (3,309) (1,420) Amount included in accumulated other comprehensive loss, net of tax $ 7,884 $ 3,382
Information Pertaining to Activity in Supplemental Retirement Plans	Information pertaining to the activity in the supplemental retirement plans, using a measurement date of December 31, is as follows: December 31, (in thousands) 2019 2018 Change in benefit obligation: Benefit obligation at beginning of year $ (29,196) $ (28,472) Service cost (879) (973) Interest cost (1,131) (949) Actuarial (loss)/gain (6,747) 92 Plan amendments — — Benefits paid 1,216 1,106 Benefit obligation at end of year $ (36,737) $ (29,196) Change in plan assets: Fair value of plan assets at beginning of year $ — $ — Fair value of plan assets at end of year $ — $ — Funded status $ (36,737) $ (29,196) Unrecognized net obligation existing at January 1, 1986 1 3 Unrecognized net actuarial loss 11,333 4,993 Unrecognized prior service cost (141) (194) Accumulated other comprehensive income (11,193) (4,802) Accrued benefit cost $ (36,737) $ (29,196) Accumulated benefit obligation $ (35,981) $ (27,544)
Net Periodic Benefit Cost Recognized for Supplemental Retirement Plans	The following table sets forth the net periodic benefit cost recognized for the supplemental retirement plans: Year Ended December 31, (in thousands) 2019 2018 2017 Net pension cost included the following components: Service cost-benefits earned during the period $ 879 $ 973 $ 941 Interest cost on projected benefit obligation 1,131 949 991 Amortization of net obligation at transition 2 2 2 Amortization of prior service cost (54) (54) (12) Recognized net actuarial loss 408 510 390 Net periodic pension cost $ 2,366 $ 2,380 $ 2,312
Assumptions Used in Accounting for Plans	The following table sets forth assumptions used in accounting for the plans: Year Ended December 31, 2019 2018 2017 Discount rate used to calculate benefit obligation 2.82 % 3.96 % 3.40 % Discount rate used to calculate net periodic pension cost 3.96 % 3.40 % 3.80 % Average annual increase in executive compensation 3.25 % 3.25 % 3.25 % Average annual increase in director compensation — % — % — %
Expected Benefit Payments to Participants and Estimated Contributions to be Made by Company	The following table sets forth the expected benefit payments to participants and estimated contributions to be made by the Company under the supplemental retirement plans for the years indicated: Expected Benefit Estimated (in thousands) 2020 $ 1,555 $ 1,555 2021 2,128 2,128 2022 2,179 2,179 2023 2,179 2,179 2024 2,191 2,193 2025-2029 10,956 10,956

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Summary of Activity in Lending Transactions	The following table summarizes the activity in these loans for the periods indicated (in thousands): Balance January 1, 2017 $ 2,148 Advances/new loans 8,854 Removed/payments (1,799) Balance December 31, 2018 9,203 Advances/new loans 9,032 Removed/payments (8,114) Balance December 31, 2019 $ 10,121

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2019
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 December 31, 2019 Total Level 1 Level 2 Level 3 Marketable equity securities $ 2,960 $ 2,960 $ — $ — Debt securities available for sale: Obligations of U.S. government agencies 472,980 — 472,980 — Obligations of states and political subdivisions 109,601 — 109,601 — Corporate bonds 2,532 — 2,532 — Asset backed securities 365,025 — 365,025 — Loans held for sale 5,265 — 5,265 — Mortgage servicing rights 6,200 — — 6,200 Total assets measured at fair value $ 964,563 $ 2,960 $ 955,403 $ 6,200 Fair value at December 31, 2018 Total Level 1 Level 2 Level 3 Marketable equity securities $ 2,874 $ 2,874 $ — $ — Debt securities available for sale: Obligations of U.S. government agencies 629,981 — 629,981 — Obligations of states and political subdivisions 126,072 — 126,072 — Corporate bonds 4,478 — 4,478 — Asset backed securities 354,505 — 354,505 — Loans held for sale 3,687 — 3,687 — Mortgage servicing rights 7,098 — — 7,098 Total assets measured at fair value $ 1,128,695 $ 2,874 $ 1,118,723 $ 7,098
Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis	The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the years ended December 31, 2019, 2018, and 2017. Had there been any transfer into or out of Level 3 during 2019, 2018, or 2017, 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): Year ended December 31, Beginning Transfers Change Issuances Ending 2019: Mortgage servicing rights $ 7,098 — $ (1,811) $ 913 $ 6,200 2018: Mortgage servicing rights $ 6,687 — $ (146) $ 557 $ 7,098 2017: Mortgage servicing rights $ 6,595 — $ (718) $ 810 $ 6,687
Quantitative Information about Recurring Level 3 Fair Value Measurements	The following table presents quantitative information about recurring Level 3 fair value measurements at December 31, 2019 and 2018: December 31, 2019 Fair Value Valuation Unobservable Range, Mortgage Servicing Rights $6,200 Discounted Constant 5.0%-27.3%, 7.6% December 31, 2018 Discount rate 12%-13%, 12% Mortgage Servicing Rights $7,098 Discounted Constant 6.2%-42.0%, 11.0% Discount rate 10.0%-14.0%, 12.0%
Assets and Liabilities Measured at Fair Value on Nonrecurring Basis	The tables below present the recorded amount of assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated, that had a write-down or an additional allowance provided during the periods indicated (in thousands): Year ended December 31, 2019 Total Level 1 Level 2 Level 3 Total Gains Fair value: Impaired Originated & PNCI loans $ 1,055 — — $ 1,055 $ (652) Real estate owned 417 — — 417 (27) Total assets measured at fair value $ 1,472 — — $ 1,472 $ (679) Year ended December 31, 2018 Total Level 1 Level 2 Level 3 Total Gains Fair value: Impaired Originated & PNCI loans $ 281 — — $ 281 $ (294) Real estate owned 1,311 — — 1,311 (8) Total assets measured at fair value $ 1,592 — — $ 1,592 $ (302)
Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis	The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at December 31, 2019 and 2018: December 31, 2019 Fair Value Valuation Technique Unobservable Inputs Range, Impaired Originated & PNCI loans $ 1,055 Sales comparison Adjustment for differences between Not meaningful; Real estate owned (Residential) $ 417 Sales comparison Adjustment for differences between Not meaningful; December 31, 2018 Fair Value Valuation Technique Unobservable Inputs Range, Impaired Originated & PNCI loans $ 281 Sales comparison Adjustment for differences between (74%)—23%; (19.76%) N/A Real estate owned (Residential) $ 693 Sales comparison Adjustment for differences between (47%)—39%; (3.13%) Real estate owned (Commercial) $ 618 Sales comparison Adjustment for differences between (84%)—19%; (84%)
Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets	The estimated fair values of financial instruments that are reported at amortized cost in the Corporation’s consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows (in thousands): December 31, 2019 December 31, 2018 Carrying Fair Carrying Fair Financial assets: Level 1 inputs: Cash and due from banks $ 92,816 $ 92,816 $ 119,781 $ 119,781 Cash at Federal Reserve and other banks 183,691 183,691 107,752 107,752 Level 2 inputs: Securities held to maturity 375,606 381,525 444,936 437,370 Restricted equity securities 17,250 N/A 17,250 N/A Level 3 inputs: Loans, net 4,276,750 4,263,064 3,989,432 4,006,986 Financial liabilities: Level 2 inputs: Deposits 5,366,994 5,365,921 5,366,466 5,362,173 Other borrowings 18,454 18,454 15,839 15,839 Level 3 inputs: Junior subordinated debt 57,232 56,297 57,042 62,610 Contract Fair Contract Fair Off-balance sheet: Level 3 inputs: Commitments $ 1,309,326 $ 13,093 $ 1,192,054 $ 11,921 Standby letters of credit 12,014 120 11,346 113 Overdraft privilege commitments 110,402 1,104 111,956 1,120

TriCo Bancshares Condensed Fi_2

TriCo Bancshares Condensed Financial Statements (Parent Only) (Tables)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Condensed Balance Sheets	Condensed Balance Sheets December 31, December 31, (In thousands) Assets Cash and cash equivalents $ 5,008 $ 2,374 Investment in Tri Counties Bank 957,544 880,907 Other assets 1,765 1,723 Total assets $ 964,317 $ 885,004 Liabilities and shareholders’ equity Other liabilities $ 515 $ 589 Junior subordinated debt 57,232 57,042 Total liabilities 57,747 57,631 Shareholders’ equity: Preferred stock, no par value: 1,000,000 shares authorized, zero issued and outstanding at December 31, 2019 and 2018 — — Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 30,523,824 and 30,417,223 shares at December 31, 2019 and 2018, respectively 543,998 541,762 Retained earnings 367,794 303,490 Accumulated other comprehensive loss, net (5,222) (17,879) Total shareholders’ equity 906,570 827,373 Total liabilities and shareholders’ equity $ 964,317 $ 885,004
Condensed Statements of Income	Condensed Statements of Income Year Ended December 31, 2019 2018 2017 (In thousands) Interest expense $ (3,272) $ (3,131) $ (2,535) Administration expense (877) (1,489) (915) Loss before equity in net income of Tri Counties Bank (4,149) (4,620) (3,450) Equity in net income of Tri Counties Bank: Distributed 32,669 26,432 19,236 Undistributed 62,326 45,315 23,359 Income tax benefit 1,226 1,193 1,409 Net income $ 92,072 $ 68,320 $ 40,554
Condensed Statements of Comprehensive Income	Condensed Statements of Comprehensive Income Year Ended December 31, 2019 2018 2017 (In thousands) Net income $ 92,072 $ 68,320 $ 40,554 Other comprehensive income (loss), net of tax: Increase (decrease) in unrealized gains on available for sale securities arising during the period 17,159 (12,434) 3,165 Change in minimum pension liability (4,502) 388 (370) Change in joint beneficiary agreement liablity — 426 (110) Other comprehensive income (loss) 12,657 (11,620) 2,685 Comprehensive income $ 104,729 $ 56,700 $ 43,239
Condensed Statements of Cash Flows	Condensed Statements of Cash Flows Year Ended December 31, 2019 2018 2017 (In thousands) Operating activities: Net income $ 92,072 $ 68,320 $ 40,554 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed equity in earnings of Tri Counties Bank (62,326) (45,315) (23,359) Equity compensation vesting expense 1,654 1,462 1,586 Net change in other assets and liabilities (1,580) (4,983) (1,295) Net cash provided by operating activities 29,820 19,484 17,486 Investing activities: None Financing activities: Issuance of common stock through option exercise 9 218 396 Repurchase of common stock (2,196) (2,483) (1,629) Cash dividends paid — common (24,999) (18,769) (15,131) Net cash used for financing activities (27,186) (21,034) (16,364) Net change in cash and cash equivalents 2,634 (1,550) 1,122 Cash and cash equivalents at beginning of year 2,374 3,924 2,802 Cash and cash equivalents at end of year $ 5,008 $ 2,374 $ 3,924

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2019
Banking and Thrift [Abstract]
Actual and Required Capital Ratios of Bank	Actual Required for Capital Adequacy Purposes Required to be (dollars in thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2019: Total Capital (to Risk Weighted Assets): Consolidated $ 753,200 15.07 % $ 524,944 10.50 % N/A N/A Tri Counties Bank $ 748,660 14.98 % $ 524,759 10.50 % $ 499,770 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 719,809 14.40 % $ 424,955 8.50 % N/A N/A Tri Counties Bank $ 715,269 14.31 % $ 424,805 8.50 % $ 399,816 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 664,296 13.29 % $ 349,963 7.00 % N/A N/A Tri Counties Bank $ 715,269 14.31 % $ 349,839 7.00 % $ 324,851 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 719,809 11.55 % $ 249,343 4.00 % N/A N/A Tri Counties Bank $ 715,269 11.47 % $ 249,337 4.00 % $ 311,672 5.00 % Actual Required for Capital Adequacy Purposes Required to be (dollars in thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2018: Total Capital (to Risk Weighted Assets): Consolidated $ 682,419 14.40 % $ 497,486 10.50 % N/A N/A Tri Counties Bank $ 680,624 14.37 % $ 497,305 10.50 % $ 473,624 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 647,262 13.66 % $ 402,727 8.50 % N/A N/A Tri Counties Bank $ 645,467 13.63 % $ 402,581 8.50 % $ 378,899 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 591,933 12.49 % $ 331,658 7.00 % N/A N/A Tri Counties Bank $ 645,467 13.63 % $ 331,537 7.00 % $ 307,856 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 647,262 10.68 % $ 242,452 4.00 % N/A N/A Tri Counties Bank $ 645,467 10.65 % $ 242,447 4.00 % $ 303,059 5.00 %

Summary of Quarterly Results _2

Summary of Quarterly Results of Operations (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Results of Operations	The following table sets forth the results of operations for the four quarters of 2019 and 2018, 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. 2019 Quarters Ended (dollars in thousands, except per share data) December 31, September 30, June 30, March 31, Interest and dividend income: Loans: Discount accretion $ 2,218 $ 2,360 $ 1,904 $ 1,655 All other loan interest income 54,644 54,639 53,587 52,743 Total loan interest income 56,862 56,999 55,491 54,398 Debt securities, dividends and interest bearing cash at banks 11,056 11,890 12,689 13,059 Total interest income 67,918 68,889 68,180 67,457 Interest expense 3,722 4,201 3,865 3,587 Net interest income 64,196 64,688 64,315 63,870 (Benefit from reversal of) provision for loan losses (298) (329) 537 (1,600) Net interest income after provision for loan losses 64,494 65,017 63,778 65,470 Noninterest income 14,186 14,108 13,423 11,803 Noninterest expense 46,964 46,344 46,697 45,452 Income before income taxes 31,716 32,781 30,504 31,821 Income tax expense 8,826 9,386 7,443 9,095 Net income $ 22,890 $ 23,395 $ 23,061 $ 22,726 Per common share: Net income (diluted) $ 0.75 $ 0.76 $ 0.75 $ 0.74 Dividends $ 0.22 $ 0.22 $ 0.19 $ 0.19 2018 Quarters Ended (dollars in thousands, except per share data) December 31, September 30, June 30, March 31, Interest and dividend income: Loans: Discount accretion $ 1,982 $ 2,098 $ 559 $ 632 All other loan interest income 53,680 51,004 38,745 37,417 Total loan interest income 55,662 53,102 39,304 38,049 Debt securities, dividends and interest bearing cash at banks 12,403 11,452 9,174 9,072 Total interest income 68,065 64,554 48,478 47,121 Interest expense 4,063 4,065 2,609 2,135 Net interest income 64,002 60,489 45,869 44,986 Provision for (benefit from reversal of provision for) loan losses 806 2,651 (638) (236) Net interest income after provision for loan losses 63,196 57,838 46,507 45,222 Noninterest income 12,634 12,186 12,174 12,290 Noninterest expense 45,285 47,378 37,870 38,162 Income before income taxes 30,545 22,646 20,811 19,350 Income tax expense 7,334 6,476 5,782 5,440 Net income $ 23,211 $ 16,170 $ 15,029 $ 13,910 Per common share: Net income (diluted) $ 0.76 $ 0.53 $ 0.65 $ 0.60 Dividends $ 0.19 $ 0.17 $ 0.17 $ 0.17

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail)	2 Months Ended	12 Months Ended
	Mar. 02, 2020USD ($)	Dec. 31, 2019USD ($)TrustSegmentOfficeBusiness	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Jan. 01, 2018USD ($)	Dec. 31, 2016USD ($)
Significant Of Accounting Policies [Line Items]
Number of subsidiary business trusts | Trust		5
Number of loan production offices | Office		2
Company's investments in the trusts		$ 1,719,000
Number of business segment | Segment		1
Marketable securities recorded		$ 2,960,000	$ 2,874,000	$ 2,874,000
Unrealized gains (losses) recognized in condensed consolidated statements of income		86,000	(64,000)
Recognized OTTI losses		$ 0	0	0
TDR loans payment period in nonaccrual status		6 months
Allowance of loan losses		$ 30,616,000	$ 32,582,000	$ 30,323,000		$ 32,503,000
North Valley Bancorp
Significant Of Accounting Policies [Line Items]
Number of subsidiary business trusts | Trust		3
California
Significant Of Accounting Policies [Line Items]
Number of counties | Business		29
Adoption ASU 2016-01 | Deferred Tax Assets
Significant Of Accounting Policies [Line Items]
New accounting pronouncement or change in accounting principle cumulative effect of change on equity or net assets					$ (18,000)
Adoption ASU 2016-01 | Retained Earnings
Significant Of Accounting Policies [Line Items]
New accounting pronouncement or change in accounting principle cumulative effect of change on equity or net assets					$ (62,000)
Minimum | ASU 2016-13 | Scenario, Forecast
Significant Of Accounting Policies [Line Items]
Allowance of loan losses	$ 42,000,000
Increase in allowance for loan and losses	11,384,000
Decline in equity, net of tax	(8,020,000)
Maximum | ASU 2016-13 | Scenario, Forecast
Significant Of Accounting Policies [Line Items]
Allowance of loan losses	50,000,000
Increase in allowance for loan and losses	19,384,000
Decline in equity, net of tax	$ (13,655,000)
Furniture and Equipment | Minimum
Significant Of Accounting Policies [Line Items]
Estimated useful lives of the related assets or lease terms		3 years
Furniture and Equipment | Maximum
Significant Of Accounting Policies [Line Items]
Estimated useful lives of the related assets or lease terms		10 years
Land Improvements and Buildings | Minimum
Significant Of Accounting Policies [Line Items]
Estimated useful lives of the related assets or lease terms		15 years
Land Improvements and Buildings | Maximum
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) $ in Thousands	Jul. 06, 2018USD ($)Branchesshares	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Goodwill		$ 220,872	$ 220,972
PNCI
Business Acquisition [Line Items]
Receivables gross contractual amount	$ 866,189
Receivables fair value	833,381
PCI
Business Acquisition [Line Items]
Receivables gross contractual amount	1,683
Receivables fair value	1,302
FNBB
Business Acquisition [Line Items]
Business combination, consideration transferred	$ 291,132
Issue of common stock shares | shares	7,405,277
Amount paid in exchange for the outstanding options	$ 6,700
Number of branches added (in branches) | Branches	12
Goodwill	$ 156,561
Core deposit intangible	$ 27,605
FNBB | Core Deposit Intangibles
Business Acquisition [Line Items]
Finite lived intangible asset estimated useful life	6 years 2 months 12 days
Acquisition related costs		$ 0	$ 5,227	$ 530

Business Combinations - Schedul

Business Combinations - Schedule of Fair Value of Consideration Transferred, Identifiable Net Assets Acquired and Resulting Goodwill (Detail) - USD ($) $ in Thousands	Jul. 06, 2018	Dec. 31, 2019	Dec. 31, 2018
Liabilities assumed:
Goodwill recognized		$ 220,872	$ 220,972
FNBB
Fair value of consideration transferred:
Fair value of shares issued	$ 284,437
Cash consideration	6,695
Total fair value of consideration transferred	291,132
Assets acquired:
Cash and cash equivalents	37,308
Securities available for sale	335,667
Restricted equity securities	7,723
Loans	834,683
Premises and equipment	30,522
Cash value of life insurance	16,817	$ 0	$ 16,817
Core deposit intangible	27,605
Other assets	16,214
Total assets acquired	1,306,539
Liabilities assumed:
Deposits	(991,935)
Other liabilities	15,033
Total liabilities assumed	1,171,968
Total net assets acquired	134,571
Goodwill recognized	156,561
FNBB | Federal Home Loan Bank of San Francisco
Liabilities assumed:
Short-term borrowings—Federal Home Loan Bank	$ 165,000

Business Combinations - Summary

Business Combinations - Summary of Estimated Fair Value Adjustments Resulting in Goodwill (Detail) - USD ($) $ in Thousands	Jul. 06, 2018	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 220,872	$ 220,972
FNBB
Business Acquisition [Line Items]
Value of stock consideration paid to FNB Bancorp Shareholders	$ 284,437
Cash consideration	6,695
Cost basis net assets acquired	114,030
Investments	(1,081)
Premises and Equipment	21,590
Core deposit intangible	27,327
Deferred income taxes	(6,394)
Other	1,489
Goodwill	156,561
FNBB | Loans
Business Acquisition [Line Items]
Loans	$ (22,390)

Business Combinations - Sched_2

Business Combinations - Schedule of Business Acquisition Pro-forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Summarized proforma income statement data:
Net interest income	$ 242,793	$ 227,795
(Provision for) benefit from loan losses	(2,180)	271
Noninterest income	51,152	53,881
Noninterest expense	(180,884)	(181,833)
Income before taxes	110,881	100,114
Income taxes	(30,337)	(47,352)
Net income	$ 80,544	$ 52,762
Basic earnings per share (in USD per share)	$ 2.65	$ 1.74
Diluted earnings per share (in USD per share)	$ 2.63	$ 1.72

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Amortized Cost	$ 946,751	$ 1,136,010
Debt Securities Available for Sale, Gross Unrealized Gains	10,721	1,235
Debt Securities Available for Sale, Gross Unrealized Losses	(7,334)	(22,209)
Debt Securities Available for Sale, Estimated Fair Value	950,138	1,115,036
Debt Securities Held to Maturity, Amortized Cost	375,606	444,936
Debt Securities Held to Maturity, Gross Unrealized Gains	6,399	409
Debt Securities Held to Maturity, Gross Unrealized Losses	(480)	(7,975)
Debt Securities Held to Maturity, Estimated Fair Value	381,525	437,370
Obligations of U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Amortized Cost	466,139	647,288
Debt Securities Available for Sale, Gross Unrealized Gains	7,261	771
Debt Securities Available for Sale, Gross Unrealized Losses	(420)	(18,078)
Debt Securities Available for Sale, Estimated Fair Value	472,980	629,981
Debt Securities Held to Maturity, Amortized Cost	361,785	430,343
Debt Securities Held to Maturity, Gross Unrealized Gains	6,072	327
Debt Securities Held to Maturity, Gross Unrealized Losses	(480)	(7,745)
Debt Securities Held to Maturity, Estimated Fair Value	367,377	422,925
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Amortized Cost	106,373	128,890
Debt Securities Available for Sale, Gross Unrealized Gains	3,229	294
Debt Securities Available for Sale, Gross Unrealized Losses	(1)	(3,112)
Debt Securities Available for Sale, Estimated Fair Value	109,601	126,072
Debt Securities Held to Maturity, Amortized Cost	13,821	14,593
Debt Securities Held to Maturity, Gross Unrealized Gains	327	82
Debt Securities Held to Maturity, Gross Unrealized Losses	0	(230)
Debt Securities Held to Maturity, Estimated Fair Value	14,148	14,445
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Amortized Cost	2,430	4,381
Debt Securities Available for Sale, Gross Unrealized Gains	102	97
Debt Securities Available for Sale, Estimated Fair Value	2,532	4,478
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Amortized Cost	371,809	355,451
Debt Securities Available for Sale, Gross Unrealized Gains	129	73
Debt Securities Available for Sale, Gross Unrealized Losses	(6,913)	(1,019)
Debt Securities Available for Sale, Estimated Fair Value	$ 365,025	$ 354,505

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019USD ($)Investmentsecurities	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Investment Securities [Line Items]
Proceeds from sales of debt securities	$ 127,066,000	$ 293,279,000	$ 25,757,000
Gross realized gains		207,000
Realized gain	338,000
Gain (loss) on available for sale security			961,000
Gross realized losses	(228,000)
Investment securities sold			$ 24,796,000
Securities pledged as collateral	466,321,000	$ 597,591,000
Residential real estate mortgage-backed securities	$ 827,924,000
Life of mortgage-backed securities	4 years 10 months 24 days
Obligations of U.S. government agencies
Investment Securities [Line Items]
Available for sale securities in unrealized loss position | Investmentsecurities	16
Percentage of aggregate depreciation in unrealized losses	0.63%
Obligations of states and political subdivisions
Investment Securities [Line Items]
Available for sale securities in unrealized loss position | Investmentsecurities	1
Percentage of aggregate depreciation in unrealized losses	0.13%
Asset backed securities
Investment Securities [Line Items]
Available for sale securities in unrealized loss position | Investmentsecurities	20
Percentage of aggregate depreciation in unrealized losses	2.01%

Investment Securities - Amort_2

Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Due in one year, Amortized Cost	$ 607
Due after one year through five years, Amortized Cost	14,853
Due after five years through ten years, Amortized Cost	91,635
Due after ten years, Amortized Cost	839,656
Totals, Amortized Cost	946,751
Due in one year, Estimated Fair Value	611
Due after one year through five years, Estimated Fair Value	15,204
Due after five years through ten years, Estimated Fair Value	91,739
Due after ten years, Estimated Fair Value	842,584
Totals, Estimated Fair Value	950,138
Due in one year, Amortized Cost, Held to Maturity	1,271
Due after one year through five years, Amortized Cost, Held to Maturity	0
Due after five years through ten years, Amortized Cost, Held to Maturity	21,366
Due after ten years, Amortized Cost, Held to Maturity	352,969
Totals, Amortized Cost, Held to Maturity	375,606	$ 444,936
Due in one year, Estimated Fair Value, Held to Maturity	1,280
Due after one year through five years, Estimated Fair Value, Held to Maturity	0
Due after five years through ten years, Estimated Fair Value, Held to Maturity	21,639
Due after ten years, Estimated Fair Value, Held to Maturity	358,606
Estimated Fair Value, Held to Maturity	$ 381,525	$ 437,370

Investment Securities - Gross U

Investment Securities - Gross Unrealized Losses on Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Less than 12 months, Fair Value	$ 274,950	$ 336,433
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss	(4,845)	(6,148)
Debt Securities Available for Sale, 12 months or more, Fair Value	123,833	415,349
Debt Securities Available for Sale, 12 months or more, Unrealized Loss	(2,489)	(16,061)
Debt Securities Available for Sale, Fair Value	398,783	751,782
Debt Securities Available for Sale, Unrealized Loss	(7,334)	(22,209)
Debt Securities Held to Maturity, Less than 12 months, Fair Value	18,813	229,596
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss	(142)	(2,733)
Debt Securities Held to Maturity, 12 months or more, Fair Value	62,952	162,690
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss	(338)	(5,242)
Debt Securities Held to Maturity, Fair Value	81,765	392,286
Debt Securities Held to Maturity, Unrealized Loss	(480)	(7,975)
Obligations of U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Less than 12 months, Fair Value	36,709	171,309
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss	(309)	(3,588)
Debt Securities Available for Sale, 12 months or more, Fair Value	23,852	394,630
Debt Securities Available for Sale, 12 months or more, Unrealized Loss	(111)	(14,490)
Debt Securities Available for Sale, Fair Value	60,561	565,939
Debt Securities Available for Sale, Unrealized Loss	(420)	(18,078)
Debt Securities Held to Maturity, Less than 12 months, Fair Value	18,813	223,810
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss	(142)	(2,619)
Debt Securities Held to Maturity, 12 months or more, Fair Value	62,952	158,648
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss	(338)	(5,126)
Debt Securities Held to Maturity, Fair Value	81,765	382,458
Debt Securities Held to Maturity, Unrealized Loss	(480)	(7,745)
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Less than 12 months, Fair Value	778	63,738
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss	(1)	(1,541)
Debt Securities Available for Sale, 12 months or more, Fair Value	0	20,719
Debt Securities Available for Sale, 12 months or more, Unrealized Loss	0	(1,571)
Debt Securities Available for Sale, Fair Value	778	84,457
Debt Securities Available for Sale, Unrealized Loss	(1)	(3,112)
Debt Securities Held to Maturity, Less than 12 months, Fair Value	0	5,786
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss	0	(114)
Debt Securities Held to Maturity, 12 months or more, Fair Value	0	4,042
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss	0	(116)
Debt Securities Held to Maturity, Fair Value	0	9,828
Debt Securities Held to Maturity, Unrealized Loss	0	(230)
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Less than 12 months, Fair Value	237,463	101,386
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss	(4,535)	(1,019)
Debt Securities Available for Sale, 12 months or more, Fair Value	99,981	0
Debt Securities Available for Sale, 12 months or more, Unrealized Loss	(2,378)	0
Debt Securities Available for Sale, Fair Value	337,444	101,386
Debt Securities Available for Sale, Unrealized Loss	$ (6,913)	$ (1,019)

Loans - Summary of Loan Balance

Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Total principal balance of loans owed, net of charge-offs	$ 4,351,725	$ 4,075,244
Unamortized net deferred loan fees	(8,927)	(9,868)
Discounts to principal balance of loans owed, net of charge-offs	(35,432)	(43,362)
Total	4,307,366	4,022,014	$ 3,015,165
Allowance for loan losses	(30,616)	(32,582)	(30,323)	$ (32,503)
Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	3,328,290	3,143,100	2,300,322
Allowance for loan losses	(14,301)	(15,620)	(13,758)	(14,265)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	445,542	418,982	356,874
Allowance for loan losses	(7,778)	(8,375)	(8,227)	(10,310)
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total	283,707	276,548	220,412
Allowance for loan losses	(5,149)	(6,090)	(6,512)	(5,831)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	249,827	183,384	137,557
Allowance for loan losses	(3,388)	(2,497)	(1,826)	(2,097)
Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	509,508	515,262	385,426
Allowance for loan losses	(2,306)	(2,676)	(2,317)	(2,748)
Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	28,586	36,684	43,031
Allowance for loan losses	(611)	(1,540)	(1,841)	(2,644)
Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	82,656	55,721	25,155
Allowance for loan losses	(1,595)	(793)	(586)	(622)
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan losses		(663)
Commercial | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,818,782	2,627,838	1,914,896
Allowance for loan losses	(11,995)	(12,944)	(11,441)	(11,517)
Commercial | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	46,861	62,088	69,627
Allowance for loan losses	(318)	(663)	(642)	(680)
Home equity lines of credit | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	334,300	326,577	288,688
Allowance for loan losses	(5,572)	(6,042)	(5,800)	(7,044)
Residential
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan losses		(1,834)
Residential | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	202,966	121,296	67,930
Allowance for loan losses	(3,070)	(1,834)	$ (1,184)	$ (1,417)
Originated
Loans and Leases Receivable Disclosure [Line Items]
Total principal balance of loans owed, net of charge-offs	3,496,622	2,991,324
Unamortized net deferred loan fees	(8,927)	(9,868)
Total	3,487,695	2,981,456
Allowance for loan losses	(30,110)	(31,793)
Originated | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,594,318	2,254,777
Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	392,693	351,133
Originated | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total	262,581	228,635
Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	238,103	146,911
Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	373,101	343,796
Originated | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	25,343	32,660
Originated | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	67,896	34,020
Originated | Commercial | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,221,217	1,910,981
Originated | Commercial | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	46,422	56,208
Originated | Home equity lines of credit | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	299,454	284,453
Originated | Residential | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	191,681	90,703
PNCI
Loans and Leases Receivable Disclosure [Line Items]
Total principal balance of loans owed, net of charge-offs	838,425	1,062,655
Discounts to principal balance of loans owed, net of charge-offs	(29,170)	(36,320)
Total	809,255	1,026,335
Allowance for loan losses	(500)	(667)
PNCI | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	727,238	878,193
PNCI | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	51,644	66,201
PNCI | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total	18,649	45,468
PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	11,724	36,473
PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	134,994	169,792
PNCI | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	2,829	3,585
PNCI | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	14,758	21,659
PNCI | Commercial | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	592,244	708,401
PNCI | Commercial | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	439	5,880
PNCI | Home equity lines of credit | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	34,057	40,957
PNCI | Residential | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	11,285	30,593
PCI
Loans and Leases Receivable Disclosure [Line Items]
Total principal balance of loans owed, net of charge-offs	16,678	21,265
Discounts to principal balance of loans owed, net of charge-offs	(6,262)	(7,042)
Total	10,416	14,223
Allowance for loan losses	(6)	(122)
PCI | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	6,734	10,130
PCI | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,205	1,648
PCI | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total	2,477	2,445
PCI | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,413	1,674
PCI | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	414	439
PCI | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	2	42
PCI | Commercial | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total	5,321	8,456
PCI | Home equity lines of credit | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 789	$ 1,167

Loans - Change in Accretable Yi

Loans - Change in Accretable Yield for PCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in accretable yield:
Balance at beginning of period	$ 6,059	$ 6,137	$ 7,670
Accretion to interest income	(852)	(787)	(2,809)
Reclassification (to) from nonaccretable difference	1,012	709	1,276
Balance at end of period	$ 6,219	$ 6,059	$ 6,137

Allowance for Loan Losses - Sum

Allowance for Loan Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	$ 32,582	$ 30,323	$ 32,503
Charge-offs	(3,639)	(2,364)	(4,410)
Recoveries	3,363	2,040	2,141
Provision (benefit)	(1,690)	2,583	89
Ending Balance	30,616	32,582	30,323
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	663
Ending Balance		663
Residential
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	1,834
Ending Balance		1,834
Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	15,620	13,758	14,265
Charge-offs	(748)	(92)	(246)
Recoveries	1,582	68	397
Provision (benefit)	(2,153)	1,886	(658)
Ending Balance	14,301	15,620	13,758
Mortgage Loans on Real Estate | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	12,944	11,441	11,517
Charge-offs	(746)	(15)	(186)
Recoveries	1,528	68	397
Provision (benefit)	(1,731)	1,450	(287)
Ending Balance	11,995	12,944	11,441
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	8,375	8,227	10,310
Charge-offs	(768)	(1,084)	(1,616)
Recoveries	1,256	1,431	1,315
Provision (benefit)	(1,085)	(199)	(1,782)
Ending Balance	7,778	8,375	8,227
Consumer | Home equity lines of credit
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	6,042	5,800	7,044
Charge-offs	0	(277)	(98)
Recoveries	504	846	698
Provision (benefit)	(974)	(327)	(1,844)
Ending Balance	5,572	6,042	5,800
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	6,090	6,512	5,831
Charge-offs	(2,123)	(1,188)	(1,444)
Recoveries	525	541	428
Provision (benefit)	657	225	1,697
Ending Balance	5,149	6,090	6,512
Construction
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	2,497	1,826	2,097
Charge-offs	0	0	(1,104)
Recoveries	0	0	1
Provision (benefit)	891	671	832
Ending Balance	3,388	2,497	1,826
Construction | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	663	642	680
Charge-offs	0
Recoveries	0		1
Provision (benefit)	(345)	21	(39)
Ending Balance	318	663	642
Construction | Residential
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	1,834	1,184	1,417
Charge-offs	0		(1,104)
Recoveries	0		0
Provision (benefit)	1,236	650	871
Ending Balance	3,070	1,834	1,184
Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	2,676	2,317	2,748
Charge-offs	(2)	(77)	(60)
Recoveries	54		0
Provision (benefit)	(422)	436	(371)
Ending Balance	2,306	2,676	2,317
Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	1,540	1,841	2,644
Charge-offs	(3)	(24)	(332)
Recoveries	431	297	242
Provision (benefit)	(1,357)	(574)	(713)
Ending Balance	611	1,540	1,841
Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	793	586	622
Charge-offs	(765)	(783)	(1,186)
Recoveries	321	288	375
Provision (benefit)	1,246	702	775
Ending Balance	$ 1,595	$ 793	$ 586

Allowance for Loan Losses - S_2

Allowance for Loan Losses - Summary of Activity in Allowance for Loan Losses, Net of Unearned Fees for Periods Indicated (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	$ 29,675	$ 30,266	$ 27,352
Individually evaluated for impairment	935	2,194	2,699
Total allowance for loan losses	30,616	32,582	30,323	$ 32,503
Loans pooled for evaluation	4,277,033	3,979,744	2,971,371
Individually evaluated for impairment	19,917	28,047	28,234
Total loans, net of unamortized deferred loan fees and discounts	4,307,366	4,022,014	3,015,165
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation		663
Total allowance for loan losses		663
Residential
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation		1,834
Total allowance for loan losses		1,834
Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	14,174	15,357	13,283
Individually evaluated for impairment	127	147	260
Total allowance for loan losses	14,301	15,620	13,758	14,265
Loans pooled for evaluation	3,307,833	3,116,086	2,271,165
Individually evaluated for impairment	13,723	16,884	19,209
Total loans, net of unamortized deferred loan fees and discounts	3,328,290	3,143,100	2,300,322
Mortgage Loans on Real Estate | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	11,917	12,737	11,351
Individually evaluated for impairment	78	91	30
Total allowance for loan losses	11,995	12,944	11,441	11,517
Loans pooled for evaluation	2,804,812	2,606,819	1,892,422
Individually evaluated for impairment	8,649	12,563	13,911
Total loans, net of unamortized deferred loan fees and discounts	2,818,782	2,627,838	1,914,896
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	7,594	8,103	7,619
Individually evaluated for impairment	178	266	591
Total allowance for loan losses	7,778	8,375	8,227	10,310
Loans pooled for evaluation	440,473	411,389	349,431
Individually evaluated for impairment	3,864	5,945	4,415
Total loans, net of unamortized deferred loan fees and discounts	445,542	418,982	356,874
Consumer | Home equity lines of credit
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	5,451	5,838	5,356
Individually evaluated for impairment	115	198	427
Total allowance for loan losses	5,572	6,042	5,800	7,044
Loans pooled for evaluation	331,437	322,764	283,502
Individually evaluated for impairment	2,074	2,646	2,688
Total loans, net of unamortized deferred loan fees and discounts	334,300	326,577	288,688
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	4,519	4,309	4,624
Individually evaluated for impairment	630	1,781	1,848
Total allowance for loan losses	5,149	6,090	6,512	5,831
Loans pooled for evaluation	278,900	268,885	213,358
Individually evaluated for impairment	2,330	5,218	4,470
Total loans, net of unamortized deferred loan fees and discounts	283,707	276,548	220,412
Construction
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	3,388	2,497	1,826
Individually evaluated for impairment	0		0
Total allowance for loan losses	3,388	2,497	1,826	2,097
Loans pooled for evaluation	249,827	183,384	137,417
Individually evaluated for impairment	0	0	140
Total loans, net of unamortized deferred loan fees and discounts	249,827	183,384	137,557
Construction | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	318		642
Individually evaluated for impairment	0
Total allowance for loan losses	318	663	642	680
Loans pooled for evaluation	46,861	62,088	69,627
Individually evaluated for impairment	0
Total loans, net of unamortized deferred loan fees and discounts	46,861	62,088	69,627
Construction | Residential
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	3,070		1,184
Individually evaluated for impairment	0
Total allowance for loan losses	3,070	1,834	1,184	1,417
Loans pooled for evaluation	202,966	121,296	67,790
Individually evaluated for impairment	0		140
Total loans, net of unamortized deferred loan fees and discounts	202,966	121,296	67,930
Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	2,257	2,620	1,932
Individually evaluated for impairment	49	56	230
Total allowance for loan losses	2,306	2,676	2,317	2,748
Loans pooled for evaluation	503,021	509,267	378,743
Individually evaluated for impairment	5,074	4,321	5,298
Total loans, net of unamortized deferred loan fees and discounts	509,508	515,262	385,426
Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	567	1,486	1,734
Individually evaluated for impairment	44	54	107
Total allowance for loan losses	611	1,540	1,841	2,644
Loans pooled for evaluation	26,522	33,142	41,076
Individually evaluated for impairment	1,650	3,103	1,470
Total loans, net of unamortized deferred loan fees and discounts	28,586	36,684	43,031
Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans pooled for evaluation	1,576	779	529
Individually evaluated for impairment	19	14	57
Total allowance for loan losses	1,595	793	586	$ 622
Loans pooled for evaluation	82,514	55,483	24,853
Individually evaluated for impairment	140	196	257
Total loans, net of unamortized deferred loan fees and discounts	82,656	55,721	25,155
Financial Asset Acquired with Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	6	122	272
Total loans, net of unamortized deferred loan fees and discounts	10,416	14,223	15,560
Financial Asset Acquired with Credit Deterioration | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	0	116	215
Total loans, net of unamortized deferred loan fees and discounts	6,734	10,130	9,948
Financial Asset Acquired with Credit Deterioration | Mortgage Loans on Real Estate | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	0	116	60
Total loans, net of unamortized deferred loan fees and discounts	5,321	8,456	8,563
Financial Asset Acquired with Credit Deterioration | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	6	6	17
Total loans, net of unamortized deferred loan fees and discounts	1,205	1,648	3,028
Financial Asset Acquired with Credit Deterioration | Consumer | Home equity lines of credit
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	6	6	17
Total loans, net of unamortized deferred loan fees and discounts	789	1,167	2,498
Financial Asset Acquired with Credit Deterioration | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	0		40
Total loans, net of unamortized deferred loan fees and discounts	2,477	2,445	2,584
Financial Asset Acquired with Credit Deterioration | Construction
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	0		0
Total loans, net of unamortized deferred loan fees and discounts	0	0	0
Financial Asset Acquired with Credit Deterioration | Construction | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	0
Total loans, net of unamortized deferred loan fees and discounts	0
Financial Asset Acquired with Credit Deterioration | Construction | Residential
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	0
Total loans, net of unamortized deferred loan fees and discounts	0
Financial Asset Acquired with Credit Deterioration | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	0		155
Total loans, net of unamortized deferred loan fees and discounts	1,413	1,674	1,385
Financial Asset Acquired with Credit Deterioration | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	0
Total loans, net of unamortized deferred loan fees and discounts	414	439	485
Financial Asset Acquired with Credit Deterioration | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans acquired with deteriorated credit quality	0
Total loans, net of unamortized deferred loan fees and discounts	$ 2	$ 42	$ 45

Allowance for Loan Losses - Sch

Allowance for Loan Losses - Schedule Credit Quality Indicators (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	$ 4,307,366	$ 4,022,014	$ 3,015,165
Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,328,290	3,143,100	2,300,322
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	445,542	418,982	356,874
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	283,707	276,548	220,412
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	249,827	183,384	137,557
Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	509,508	515,262	385,426
Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	28,586	36,684	43,031
Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	82,656	55,721	25,155
Originated
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,487,695	2,981,456
Originated | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,594,318	2,254,777
Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	392,693	351,133
Originated | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	262,581	228,635
Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	238,103	146,911
Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	373,101	343,796
Originated | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	25,343	32,660
Originated | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	67,896	34,020
PNCI
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	809,255	1,026,335
PNCI | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	727,238	878,193
PNCI | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	51,644	66,201
PNCI | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	18,649	45,468
PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	11,724	36,473
PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	134,994	169,792
PNCI | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,829	3,585
PNCI | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	14,758	21,659
Commercial | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,818,782	2,627,838	1,914,896
Commercial | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	46,861	62,088	69,627
Commercial | Originated | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,221,217	1,910,981
Commercial | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	46,422	56,208
Commercial | PNCI | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	592,244	708,401
Commercial | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	439	5,880
Home equity lines of credit | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	334,300	326,577	288,688
Home equity lines of credit | Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	299,454	284,453
Home equity lines of credit | PNCI | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	34,057	40,957
Residential | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	202,966	121,296	$ 67,930
Residential | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	191,681	90,703
Residential | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	11,285	30,593
Pass | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,427,375	2,904,603
Pass | Originated | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,552,110	2,198,816
Pass | Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	383,172	342,386
Pass | Originated | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	254,554	217,126
Pass | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	237,539	146,275
Pass | Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	366,149	337,189
Pass | Originated | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	22,318	29,289
Pass | Originated | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	67,422	33,606
Pass | PNCI
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	792,033	1,014,950
Pass | PNCI | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	716,649	869,776
Pass | PNCI | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	49,260	63,674
Pass | PNCI | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	18,602	45,027
Pass | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	7,522	36,473
Pass | PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	131,820	167,908
Pass | PNCI | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,774	3,413
Pass | PNCI | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	14,390	21,481
Pass | Commercial | Originated | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,185,961	1,861,627
Pass | Commercial | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	46,105	55,863
Pass | Commercial | PNCI | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	584,829	701,868
Pass | Commercial | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	439	5,880
Pass | Home equity lines of credit | Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	293,432	279,491
Pass | Home equity lines of credit | PNCI | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	32,096	38,780
Pass | Residential | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	191,434	90,412
Pass | Residential | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	7,083	30,593
Special Mention | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	36,022	45,415
Special Mention | Originated | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	26,982	35,207
Special Mention | Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	4,897	3,704
Special Mention | Originated | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,826	6,127
Special Mention | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	317	377
Special Mention | Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,497	1,724
Special Mention | Originated | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,192	1,054
Special Mention | Originated | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	373	341
Special Mention | PNCI
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	8,196	5,863
Special Mention | PNCI | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,790	4,171
Special Mention | PNCI | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,203	1,371
Special Mention | PNCI | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1	321
Special Mention | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	4,202
Special Mention | PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,217	1,086
Special Mention | PNCI | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	0	74
Special Mention | PNCI | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	346	173
Special Mention | Commercial | Originated | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	24,485	33,483
Special Mention | Commercial | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	317	345
Special Mention | Commercial | PNCI | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	573	3,085
Special Mention | Commercial | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	0
Special Mention | Home equity lines of credit | Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,332	2,309
Special Mention | Home equity lines of credit | PNCI | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	857	1,124
Special Mention | Residential | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	0	32
Special Mention | Residential | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	4,202
Substandard | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	24,298	31,438
Substandard | Originated | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	15,226	20,754
Substandard | Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	4,624	5,043
Substandard | Originated | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	4,201	5,382
Substandard | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	247	259
Substandard | Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	4,455	4,883
Substandard | Originated | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,833	2,317
Substandard | Originated | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	101	73
Substandard | PNCI
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	9,026	5,522
Substandard | PNCI | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	7,799	4,246
Substandard | PNCI | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,181	1,156
Substandard | PNCI | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	46	120
Substandard | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	0
Substandard | PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	957	798
Substandard | PNCI | Home equity loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	55	98
Substandard | PNCI | Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	22	5
Substandard | Commercial | Originated | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	10,771	15,871
Substandard | Commercial | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	0
Substandard | Commercial | PNCI | Mortgage Loans on Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	6,842	3,448
Substandard | Commercial | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	0
Substandard | Home equity lines of credit | Originated | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,690	2,653
Substandard | Home equity lines of credit | PNCI | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,104	1,053
Substandard | Residential | Originated | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	247	$ 259
Substandard | Residential | PNCI | Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	$ 0

Allowance for Loan Losses - Ana

Allowance for Loan Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 4,307,366	$ 4,022,014	$ 3,015,165
Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,328,290	3,143,100	2,300,322
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	445,542	418,982	356,874
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	283,707	276,548	220,412
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	249,827	183,384	137,557
Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	509,508	515,262	385,426
Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	28,586	36,684	43,031
Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	82,656	55,721	25,155
Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,818,782	2,627,838	1,914,896
Commercial | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	46,861	62,088	69,627
Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	334,300	326,577	288,688
Residential | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	202,966	121,296	$ 67,930
Originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	4,764	10,460
Financing Receivable, Recorded Investment, Current	3,482,931	2,970,996
Total	3,487,695	2,981,456
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,541	4,212
Financing Receivable, Recorded Investment, Current	2,591,777	2,250,565
Total	2,594,318	2,254,777
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,313	3,160
Financing Receivable, Recorded Investment, Current	391,380	347,973
Total	392,693	351,133
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	910	2,879
Financing Receivable, Recorded Investment, Current	261,671	225,756
Total	262,581	228,635
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	209
Financing Receivable, Recorded Investment, Current	238,103	146,702
Total	238,103	146,911
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,082	2,285
Financing Receivable, Recorded Investment, Current	371,019	341,511
Total	373,101	343,796
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	384	1,281
Financing Receivable, Recorded Investment, Current	24,959	31,379
Total	25,343	32,660
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	124	315
Financing Receivable, Recorded Investment, Current	67,772	33,705
Total	67,896	34,020
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0
Originated | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	459	1,927
Financing Receivable, Recorded Investment, Current	2,220,758	1,909,054
Total	2,221,217	1,910,981
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Commercial | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	46,422	56,208
Total	46,422	56,208
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	805	1,564
Financing Receivable, Recorded Investment, Current	298,649	282,889
Total	299,454	284,453
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Originated | Residential | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	209
Financing Receivable, Recorded Investment, Current	191,681	90,494
Total	191,681	90,703
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
PNCI
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	3,421	6,908
Financing Receivable, Recorded Investment, Current	805,834	1,019,427
Total	809,255	1,026,335
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	19	0
PNCI | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,710	5,162
Financing Receivable, Recorded Investment, Current	724,528	873,031
Total	727,238	878,193
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0
PNCI | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	660	810
Financing Receivable, Recorded Investment, Current	50,984	65,391
Total	51,644	66,201
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	19	0
PNCI | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	51	936
Financing Receivable, Recorded Investment, Current	18,598	44,532
Total	18,649	45,468
PNCI | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	11,724	36,473
Total	11,724	36,473
PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	305	1,298
Financing Receivable, Recorded Investment, Current	134,689	168,494
Total	134,994	169,792
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0
PNCI | Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	51	74
Financing Receivable, Recorded Investment, Current	2,778	3,511
Total	2,829	3,585
PNCI | Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	19	160
Financing Receivable, Recorded Investment, Current	14,739	21,499
Total	14,758	21,659
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	19
PNCI | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,405	3,864
Financing Receivable, Recorded Investment, Current	589,839	704,537
Total	592,244	708,401
PNCI | Commercial | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	439	5,880
Total	439	5,880
PNCI | Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	590	576
Financing Receivable, Recorded Investment, Current	33,467	40,381
Total	34,057	40,957
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0
PNCI | Residential | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	11,285	30,593
Total	11,285	30,593
Financing Receivables, 30 to 59 Days Past Due | Originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	850	5,617
Financing Receivables, 30 to 59 Days Past Due | Originated | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	90	2,106
Financing Receivables, 30 to 59 Days Past Due | Originated | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	156	2,249
Financing Receivables, 30 to 59 Days Past Due | Originated | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	604	1,053
Financing Receivables, 30 to 59 Days Past Due | Originated | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	209
Financing Receivables, 30 to 59 Days Past Due | Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	60	1,675
Financing Receivables, 30 to 59 Days Past Due | Originated | Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	36	1,043
Financing Receivables, 30 to 59 Days Past Due | Originated | Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	120	298
Financing Receivables, 30 to 59 Days Past Due | Originated | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	30	431
Financing Receivables, 30 to 59 Days Past Due | Originated | Commercial | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0
Financing Receivables, 30 to 59 Days Past Due | Originated | Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	908
Financing Receivables, 30 to 59 Days Past Due | Originated | Residential | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	209
Financing Receivables, 30 to 59 Days Past Due | PNCI
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	406	3,871
Financing Receivables, 30 to 59 Days Past Due | PNCI | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	268	2,655
Financing Receivables, 30 to 59 Days Past Due | PNCI | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	138	538
Financing Receivables, 30 to 59 Days Past Due | PNCI | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	678
Financing Receivables, 30 to 59 Days Past Due | PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	1,009
Financing Receivables, 30 to 59 Days Past Due | PNCI | Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	51	74
Financing Receivables, 30 to 59 Days Past Due | PNCI | Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	160
Financing Receivables, 30 to 59 Days Past Due | PNCI | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	268	1,646
Financing Receivables, 30 to 59 Days Past Due | PNCI | Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	87	304
Financing Receivables, 60 to 89 Days Past Due | Originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	807	1,999
Financing Receivables, 60 to 89 Days Past Due | Originated | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	201	1,332
Financing Receivables, 60 to 89 Days Past Due | Originated | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	309	88
Financing Receivables, 60 to 89 Days Past Due | Originated | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	297	579
Financing Receivables, 60 to 89 Days Past Due | Originated | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0
Financing Receivables, 60 to 89 Days Past Due | Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	65	132
Financing Receivables, 60 to 89 Days Past Due | Originated | Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	216	24
Financing Receivables, 60 to 89 Days Past Due | Originated | Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	17
Financing Receivables, 60 to 89 Days Past Due | Originated | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	136	1,200
Financing Receivables, 60 to 89 Days Past Due | Originated | Commercial | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0
Financing Receivables, 60 to 89 Days Past Due | Originated | Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	93	47
Financing Receivables, 60 to 89 Days Past Due | Originated | Residential | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0
Financing Receivables, 60 to 89 Days Past Due | PNCI
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	565	1,449
Financing Receivables, 60 to 89 Days Past Due | PNCI | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	305	1,269
Financing Receivables, 60 to 89 Days Past Due | PNCI | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	260	35
Financing Receivables, 60 to 89 Days Past Due | PNCI | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	145
Financing Receivables, 60 to 89 Days Past Due | PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	305	133
Financing Receivables, 60 to 89 Days Past Due | PNCI | Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due		0
Financing Receivables, 60 to 89 Days Past Due | PNCI | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	1,136
Financing Receivables, 60 to 89 Days Past Due | PNCI | Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	260	35
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due		296
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	3,107	2,844
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,250	774
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	848	823
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	9	1,247
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,957	478
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	132	214
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	4
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due		0
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	293
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Commercial | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	712	609
Financing Receivables, Equal to Greater than 90 Days Past Due | Originated | Residential | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0
Financing Receivables, Equal to Greater than 90 Days Past Due | PNCI
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,450	1,588
Financing Receivables, Equal to Greater than 90 Days Past Due | PNCI | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,137	1,238
Financing Receivables, Equal to Greater than 90 Days Past Due | PNCI | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	262	237
Financing Receivables, Equal to Greater than 90 Days Past Due | PNCI | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	51	113
Financing Receivables, Equal to Greater than 90 Days Past Due | PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	156
Financing Receivables, Equal to Greater than 90 Days Past Due | PNCI | Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	19
Financing Receivables, Equal to Greater than 90 Days Past Due | PNCI | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,137	1,082
Financing Receivables, Equal to Greater than 90 Days Past Due | PNCI | Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 243	$ 237

Allowance for Loan Losses - S_3

Allowance for Loan Losses - Schedule of Non Accrual Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 14,662	$ 22,274
Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	9,528	14,309
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	3,045	4,090
Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	4,423	3,578
Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,212	1,769
Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	31	7
Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	5,105	10,731
Commercial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	2,089	3,875
Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,802	2,314
Originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	10,751	19,416
Originated | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	6,249	12,507
Originated | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	2,464	3,154
Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	3,547	3,244
Originated | Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,181	1,722
Originated | Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	29	3
Originated | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	2,702	9,263
Originated | Commercial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	2,038	3,755
Originated | Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,254	1,429
PNCI
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	3,911	2,858
PNCI | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	3,279	1,802
PNCI | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	581	936
PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	876	334
PNCI | Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	31	47
PNCI | Other | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	2	4
PNCI | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	2,403	1,468
PNCI | Commercial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	51	120
PNCI | Home equity lines of credit | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 548	$ 885

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Originated
Loans and Leases Receivable Disclosure [Line Items]
Interest income on non accrual loans	$ 896,000	$ 1,584,000	$ 1,067,000
Interest income on non accrual loans ,recognized	210,000	486,000	530,000
Impaired TDR Loans	7,285,000	10,253,000	12,517,000
PNCI
Loans and Leases Receivable Disclosure [Line Items]
Interest income on non accrual loans	305,000	1,122,000	73,000
Interest income on non accrual loans ,recognized	162,000	989,000	18,000
Impaired TDR Loans	726,000	615,000	1,352,000
Obligation Related To Troubled Debt Restructuring	$ 0	$ 0	$ 0

Allowance for Loan Losses - Imp

Allowance for Loan Losses - Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Unpaid principal balance		$ 120
Recorded investment with no related allowance		113
Recorded investment with related allowance		7
Total recorded investment		120
Related allowance		7
Average recorded investment		60
Interest income recognized		1
Originated
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 17,248	27,385	$ 26,178
Recorded investment with no related allowance	11,846	20,904	18,078
Recorded investment with related allowance	3,685	4,539	7,188
Total recorded investment	15,531	25,443	25,266
Related allowance	756	1,948	2,232
Average recorded investment	21,028	24,713	24,626
Interest income recognized	211	386	1,052
Originated | Mortgage Loans on Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	11,379	17,675	18,209
Recorded investment with no related allowance	7,835	14,339	15,159
Recorded investment with related allowance	2,609	2,073	2,691
Total recorded investment	10,444	16,412	17,850
Related allowance	127	98	260
Average recorded investment	13,731	16,632	17,352
Interest income recognized	157	227	788
Originated | Consumer
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	3,257	4,277	3,263
Recorded investment with no related allowance	2,548	3,641	2,204
Recorded investment with related allowance	260	179	602
Total recorded investment	2,808	3,820	2,806
Related allowance	50	76	124
Average recorded investment	3,551	3,422	2,915
Interest income recognized	42	68	71
Originated | Commercial
Financing Receivable, Impaired [Line Items]
Unpaid principal balance		5,433	4,566
Recorded investment with no related allowance		2,924	575
Recorded investment with related allowance		2,287	3,895
Total recorded investment		5,211	4,470
Related allowance		1,774	1,848
Average recorded investment		4,654	4,283
Interest income recognized		91	184
Originated | Construction
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	0	0	140
Recorded investment with no related allowance	0	0	140
Recorded investment with related allowance	0
Total recorded investment	0	0	140
Related allowance	0
Average recorded investment	0	5	76
Interest income recognized	0	0	9
Originated | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	4,836	4,594	4,023
Recorded investment with no related allowance	3,434	3,663	2,058
Recorded investment with related allowance	764	308	1,881
Total recorded investment	4,198	3,971	3,939
Related allowance	49	56	230
Average recorded investment	4,388	3,517	3,501
Interest income recognized	71	90	143
Originated | Home equity loans | Consumer
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,895	2,374	1,627
Recorded investment with no related allowance	1,278	1,892	1,107
Recorded investment with related allowance	234	65	198
Total recorded investment	1,512	1,957	1,305
Related allowance	42	2	10
Average recorded investment	1,839	1,520	1,193
Interest income recognized	5	23	24
Originated | Other | Consumer
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	47	3	55
Recorded investment with no related allowance	3	0	4
Recorded investment with related allowance	25	3	3
Total recorded investment	28	3	7
Related allowance	7	3	3
Average recorded investment	33	17	20
Interest income recognized	2	2	0
Originated | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	6,543	13,081	14,186
Recorded investment with no related allowance	4,401	10,676	13,101
Recorded investment with related allowance	1,845	1,765	810
Total recorded investment	6,246	12,441	13,911
Related allowance	78	42	30
Average recorded investment	9,343	13,115	13,851
Interest income recognized	86	137	645
Originated | Commercial | Commercial
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	2,612
Recorded investment with no related allowance	1,463
Recorded investment with related allowance	816
Total recorded investment	2,279
Related allowance	579
Average recorded investment	3,746
Interest income recognized	12
Originated | Home equity lines of credit | Consumer
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,315	1,900	1,581
Recorded investment with no related allowance	1,267	1,749	1,093
Recorded investment with related allowance	1	111	401
Total recorded investment	1,268	1,860	1,494
Related allowance	1	71	111
Average recorded investment	1,679	1,885	1,702
Interest income recognized	35	43	47
Originated | Residential | Construction
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	0	0	140
Recorded investment with no related allowance	0	0	140
Recorded investment with related allowance	0
Total recorded investment	0	0	140
Related allowance	0
Average recorded investment	0	5	76
Interest income recognized	0	0	9
PNCI
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	4,542	4,990	3,048
Recorded investment with no related allowance	3,753	2,570	1,994
Recorded investment with related allowance	633	656	974
Total recorded investment	4,386	3,226	2,968
Related allowance	179	246	467
Average recorded investment	3,831	3,691	3,563
Interest income recognized	161	207	89
PNCI | Mortgage Loans on Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	3,350	3,485	1,404
Recorded investment with no related allowance	3,279	1,802	1,359
Recorded investment with related allowance	0		0
Total recorded investment	3,279	1,802	1,359
Related allowance	0		0
Average recorded investment	2,540	2,242	2,020
Interest income recognized	155	188	24
PNCI | Consumer
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,133	1,385	1,644
Recorded investment with no related allowance	474	655	635
Recorded investment with related allowance	582	649	974
Total recorded investment	1,056	1,304	1,609
Related allowance	128	239	467
Average recorded investment	1,205	1,389	1,543
Interest income recognized	6	18	65
PNCI | Construction
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	0
Recorded investment with no related allowance	0
Recorded investment with related allowance	0
Total recorded investment	0
Related allowance	0
Average recorded investment	0
Interest income recognized	0
PNCI | Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	945	375	1,404
Recorded investment with no related allowance	876	334	1,359
Recorded investment with related allowance	0		0
Total recorded investment	876	334	1,359
Related allowance	0		0
Average recorded investment	605	529	1,041
Interest income recognized	9	5	24
PNCI | Home equity loans | Consumer
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	159	252	178
Recorded investment with no related allowance	20	47	44
Recorded investment with related allowance	118	197	121
Total recorded investment	138	244	165
Related allowance	2	101	97
Average recorded investment	189	155	117
Interest income recognized	0	0	6
PNCI | Other
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance		21
PNCI | Other | Consumer
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	112	106	250
Recorded investment with no related allowance	59		0
Recorded investment with related allowance	53	85	250
Total recorded investment	112	106	250
Related allowance	12	11	54
Average recorded investment	111	114	186
Interest income recognized	0	0	11
PNCI | Commercial | Mortgage Loans on Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	2,405	3,110
Recorded investment with no related allowance	2,403	1,468
Recorded investment with related allowance	0
Total recorded investment	2,403	1,468
Related allowance	0
Average recorded investment	1,935	1,713	979
Interest income recognized	146	183
PNCI | Commercial | Commercial
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	59
Recorded investment with no related allowance	0
Recorded investment with related allowance	51
Total recorded investment	51
Related allowance	51
Average recorded investment	86
Interest income recognized	0
PNCI | Home equity lines of credit | Consumer
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	862	1,027	1,216
Recorded investment with no related allowance	395	587	591
Recorded investment with related allowance	411	367	603
Total recorded investment	806	954	1,194
Related allowance	114	127	316
Average recorded investment	905	1,120	1,240
Interest income recognized	6	$ 18	$ 48
PNCI | Residential | Construction
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	0
Recorded investment with no related allowance	0
Recorded investment with related allowance	0
Total recorded investment	0
Related allowance	0
Average recorded investment	0
Interest income recognized	$ 0

Allowance for Loan Losses - Tro

Allowance for Loan Losses - Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)SecurityLoan	Dec. 31, 2018USD ($)SecurityLoan	Dec. 31, 2017USD ($)SecurityLoan
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	18	17	26
Pre-mod outstanding principal balance	$ 2,851	$ 3,768	$ 7,111
Post-mod outstanding principal balance	2,829	3,755	6,978
Financial impact due to TDR taken as additional provision	$ 59	$ 781	$ 133
Number that defaulted during the period | SecurityLoan	1	6	5
Recorded investment of TDRs that defaulted during the period	$ 7	$ 565	$ 624
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0		$ (5)
Mortgage Loans on Real Estate
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	5	8	9
Pre-mod outstanding principal balance	$ 719	$ 1,938	$ 4,660
Post-mod outstanding principal balance	729	1,935	4,634
Financial impact due to TDR taken as additional provision	$ 30	$ 491	$ 58
Number that defaulted during the period | SecurityLoan	0	1	3
Recorded investment of TDRs that defaulted during the period	$ 0	$ 169	$ 442
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0
Consumer
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	3	3	5
Pre-mod outstanding principal balance	$ 214	$ 732	$ 453
Post-mod outstanding principal balance	215	737	453
Financial impact due to TDR taken as additional provision	$ 29	$ (35)	$ 38
Number that defaulted during the period | SecurityLoan	0	2	2
Recorded investment of TDRs that defaulted during the period	$ 0	$ 248	$ 182
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0
Commercial
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	10	6	11
Pre-mod outstanding principal balance	$ 1,918	$ 1,098	$ 1,854
Post-mod outstanding principal balance	1,885	1,083	1,747
Financial impact due to TDR taken as additional provision	$ 0	$ 325	$ 37
Number that defaulted during the period | SecurityLoan	1	3
Recorded investment of TDRs that defaulted during the period	$ 7	$ 148
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0
Construction
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	0		1
Pre-mod outstanding principal balance	$ 0		$ 144
Post-mod outstanding principal balance	0		$ 144
Financial impact due to TDR taken as additional provision	$ 0
Number that defaulted during the period | SecurityLoan	0
Recorded investment of TDRs that defaulted during the period	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0
Residential 1-4 family | Mortgage Loans on Real Estate
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	3	1	1
Pre-mod outstanding principal balance	$ 659	$ 156	$ 939
Post-mod outstanding principal balance	662	$ 156	939
Financial impact due to TDR taken as additional provision	$ 30		$ 169
Number that defaulted during the period | SecurityLoan	0		2
Recorded investment of TDRs that defaulted during the period	$ 0		$ 223
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0
Home equity loans | Consumer
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	2	2	1
Pre-mod outstanding principal balance	$ 149	$ 599	$ 252
Post-mod outstanding principal balance	147	599	$ 252
Financial impact due to TDR taken as additional provision	$ 29	$ (35)
Number that defaulted during the period | SecurityLoan	0		1
Recorded investment of TDRs that defaulted during the period	$ 0		$ 55
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0
Other | Consumer
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	0		1
Pre-mod outstanding principal balance	$ 0		$ 14
Post-mod outstanding principal balance	0		14
Financial impact due to TDR taken as additional provision	$ 0		$ 11
Number that defaulted during the period | SecurityLoan	0
Recorded investment of TDRs that defaulted during the period	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0
Commercial | Mortgage Loans on Real Estate
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	2	7	8
Pre-mod outstanding principal balance	$ 60	$ 1,782	$ 3,721
Post-mod outstanding principal balance	67	1,779	3,695
Financial impact due to TDR taken as additional provision	$ 0	$ 491	$ (111)
Number that defaulted during the period | SecurityLoan	0	1	1
Recorded investment of TDRs that defaulted during the period	$ 0	$ 169	$ 219
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0
Home equity lines of credit | Consumer
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	1	1	3
Pre-mod outstanding principal balance	$ 65	$ 133	$ 187
Post-mod outstanding principal balance	68	$ 138	187
Financial impact due to TDR taken as additional provision	$ 0		$ 27
Number that defaulted during the period | SecurityLoan	0	2	1
Recorded investment of TDRs that defaulted during the period	$ 0	$ 248	$ 127
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0		$ (5)
Residential | Construction
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	0		1
Pre-mod outstanding principal balance	$ 0		$ 144
Post-mod outstanding principal balance	0		$ 144
Financial impact due to TDR taken as additional provision	$ 0
Number that defaulted during the period | SecurityLoan	0
Recorded investment of TDRs that defaulted during the period	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0

Real Estate Owned - Summary of

Real Estate Owned - Summary of Activity in Balance of Foreclosed Assets (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Assets	Dec. 31, 2018USD ($)Assets	Dec. 31, 2017USD ($)
Repossessed Assets [Abstract]
Beginning balance, net	$ 2,280	$ 3,226
Additions/transfers from loans	1,249	1,262
Dispositions/sales	(1,090)	(2,119)
Valuation adjustments	102	(89)
Ending balance, net	2,541	2,280	$ 3,226
Ending valuation allowance	$ (139)	$ (116)
Ending number of foreclosed assets (in assets) | Assets	6	11
Proceeds from sale of real estate owned	$ 1,336	$ 2,527	2,872
Gains (Losses) on Sales of Other Real Estate	$ 246	$ 408	$ 711

Real Estate Owned - Additional

Real Estate Owned - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Foreclosed Assets Activity [Line Items]
Foreclosed assets	$ 2,541	$ 2,280	$ 3,226
Residential Real Estate
Schedule Of Foreclosed Assets Activity [Line Items]
Foreclosed assets	1,048
Formal foreclosure proceedings	$ 39

Premises and Equipment - Summar

Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment, Net, by Type [Abstract]
Land and land improvements	$ 29,453	$ 29,065
Buildings	65,241	64,478
Furniture and equipment	45,723	45,228
Premises and equipment, gross	140,417	138,771
Less: Accumulated depreciation	(53,704)	(50,125)
Premises and equipment less depreciation, gross	86,713	88,646
Construction in progress	373	701
Total premises and equipment	$ 87,086	$ 89,347

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Depreciation expense for premises and equipment	$ 6,472	$ 6,104	$ 5,686

Cash Value of Life Insurance -

Cash Value of Life Insurance - Summary of Activity in Balance of Cash Value of Life Insurance (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)CompanyPoliciesEmployees	Dec. 31, 2018USD ($)CompanyPoliciesEmployees	Dec. 31, 2017USD ($)	Jul. 06, 2018USD ($)
Insurance [Line Items]
Beginning balance	$ 117,318	$ 97,783
Increase in cash value of life insurance	3,029	2,718	$ 2,685
Gain on death benefit	831
Insurance proceeds receivable reclassified to other assets	(3,355)
Ending balance	117,823	117,318	$ 97,783
End of period death benefit	$ 199,084	$ 200,249
Number of policies owned (in policies) | Policies	189	196
Insurance companies used (in companies) | Company	14	14
Current and former employees and directors covered (in employees) | Employees	63	66
FNBB
Insurance [Line Items]
Acquired policies from business combination	$ 0	$ 16,817		$ 16,817

Cash Value of Life Insurance _2

Cash Value of Life Insurance - Additional Information (Detail) - Company	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash Value of Life Insurance [Abstract]
Insurance companies used (in companies)	14	14

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Summary of Goodwill Intangible (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Beginning Balance	$ 220,972
Goodwill, Additions	0
Goodwill, Other Reductions	(100)
Goodwill, Ending Balance	$ 220,872

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Additional Information (Detail) $ in Thousands	Mar. 18, 2016USD ($)Branches	Dec. 31, 2019USD ($)	Jul. 06, 2018USD ($)	Oct. 03, 2014USD ($)	Sep. 23, 2011USD ($)
Finite-Lived Intangible Assets [Line Items]
Impairment charges		$ 0
FNBB
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles			$ 27,605
North Valley Bancorp
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles				$ 6,614
Citizens
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles					$ 898
Bank of America
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles	$ 2,046
Number of branches (in branches) | Branches	3

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Summary of Core Deposit Intangibles (Detail) - Core Deposit Intangibles $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Finite-Lived Intangible Assets [Line Items]
Core deposit intangibles, Beginning balance	$ 37,163
Core deposit intangibles, Additions	0
Core deposit intangibles, Reductions/Amortization	0
Core deposit intangibles, Ending balance	37,163
Accumulated amortization, Beginning balance	(7,883)
Accumulated amortization, Additions	0
Accumulated amortization, Reductions/Amortization	(5,723)
Accumulated amortization, Ending balance	(13,606)
Core deposit intangibles, net, Beginning balance	29,280
Core deposit intangibles, net, Additions	0
Core deposit intangibles, net, Reductions/Amortization	5,723
Core deposit intangibles, net, Ending balance	$ 23,557

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Remaining Estimated Core Deposit Intangible Amortization (Detail) - Core Deposit Intangibles - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
2020	$ 5,723
2021	5,465
2022	4,776
2023	4,269
2024	2,482
Thereafter	842
Total	$ 23,557	$ 29,280

Mortgage Servicing Rights - Fai

Mortgage Servicing Rights - Fair Value of Mortgage Servicing Rights (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period	$ 7,098
Balance at end of period	6,200	$ 7,098
Contractually specified servicing fees, late fees and ancillary fees earned	1,917	2,038	$ 2,076
Mortgage servicing rights
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period	7,098	6,687	6,595
Additions	913	557	810
Change in fair value	(1,811)	(146)	(718)
Balance at end of period	$ 6,200	$ 7,098	$ 6,687
Constant prepayment rate
Servicing Assets at Fair Value [Line Items]
Fair Value Of Mortgage Servicing Rights Weighted Average	0.062	0.076	0.089
Discount rate
Servicing Assets at Fair Value [Line Items]
Fair Value Of Mortgage Servicing Rights Weighted Average	0.120	0.120	0.130
Loans
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period	$ 785,138	$ 811,065	$ 816,623
Balance at end of period	$ 767,662	$ 785,138	$ 811,065

Components of Lease Expense (De

Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Operating lease cost	$ 5,228
Short-term lease cost	262
Variable lease cost	(29)
Sublease income	(131)
Total lease cost	$ 5,330
Rent expense under operating leases		$ 6,348	$ 5,885
Rent expense offset by rent income		$ 42	$ 44

Supplemental Cash Flow Informat

Supplemental Cash Flow Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating cash flows for operating leases	$ 4,931
ROUA obtained in exchange for operating lease liabilities	$ 32,162

Lease Term and Discount Rate (D

Lease Term and Discount Rate (Details)	Dec. 31, 2019
Leases [Abstract]
Weighted-average remaining lease term	9 years 3 months 18 days
Weighted-average discount rate	3.20%

Future Expected Operating Lease

Future Expected Operating Lease Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
2020	$ 4,388
2021	4,235
2022	3,896
2023	3,216
2024	2,937
Thereafter	13,745
Total	32,417
Discount for present value of expected cash flows	(4,877)
Lease liability at December 31, 2019	$ 27,540	$ 0

Deposits - Summary of Balances

Deposits - Summary of Balances of Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deposits [Abstract]
Noninterest-bearing demand	$ 1,832,665	$ 1,760,580
Interest-bearing demand	1,242,274	1,252,366
Savings	1,851,549	1,921,324
Time certificates, $250,000 and over	129,061	132,429
Other time certificates	311,445	299,767
Total deposits	$ 5,366,994	$ 5,366,466

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Deposits [Line Items]
Deposit Liabilities Reclassified as Loans Receivable	$ 1,550,000	$ 1,469,000
California
Schedule Of Deposits [Line Items]
Certificate of deposits, included in time certificates, over $250,000	$ 30,000,000	$ 60,000,000

Deposits - Schedule of Maturiti

Deposits - Schedule of Maturities of Time Deposits (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Summary of maturities of time deposits [Abstract]
2020	$ 340,150
2021	57,076
2022	38,552
2023	2,798
2024	1,924
Thereafter	6
Total	$ 440,506

Other Borrowings - Summary of B

Other Borrowings - Summary of Balances of Other Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total other borrowings	$ 18,454	$ 15,839
0.05% Fixed Rate Collateralized Borrowings
Debt Instrument [Line Items]
Other Secured Financings	$ 18,454	$ 15,839

Other Borrowings - Summary of_2

Other Borrowings - Summary of Balances of Other Borrowings, Nonprinting (Detail)	Dec. 31, 2019	Dec. 31, 2018
0.05% Fixed Rate Collateralized Borrowings
Debt Instrument [Line Items]
Collateralized borrowing, fixed rate	0.05%	0.05%

Other Borrowings - Additional I

Other Borrowings - Additional Information (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Borrowings [Line Items]
FHLB collateral line of credit, maximum borrowings capacity	$ 2,257,336,000
FHLB collateral line of credit, outstanding balance	0
Loans designated as potential collateral under collateralized line of credit with FHLB	160,134,000
Investment securities designated as potential collateral under collateral line of credit	3,070,793,000
Repurchase investment securities sold and pledged as collateral under securities repurchase agreement	48,878,000
Collateralized line of credit with San Francisco Federal Reserve Bank, maximum borrowings capacity	273,395,000
Collateralized line of credit with San Francisco Federal Reserve Bank, outstanding balance	0
Investment securities designated as potential collateral under collateral line of credit with San Francisco Federal Reserve Bank	10,000
Loans designated as potential collateral under collateral line of credit with San Francisco Federal Reserve Bank	273,385,000
Unused correspondent banking lines of credit from commercial banks for federal funds	60,000,000
0.05% Fixed Rate Collateralized Borrowings
Schedule Of Borrowings [Line Items]
Other collateralized borrowings	$ 18,454,000	$ 15,839,000

Junior Subordinated Debt - Addi

Junior Subordinated Debt - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)TrustLocation	Dec. 31, 2018USD ($)
Class of Stock [Line Items]
Number of subsidiary business trusts | Trust	5
Preferred stock, no par value: 1,000,000 shares authorized, zero issued and outstanding at December 31, 2018 and 2017 | $	$ 0	$ 0
Number of locations organized | Location	2
Wholly Owned Subsidiaries
Class of Stock [Line Items]
Preferred stock, no par value: 1,000,000 shares authorized, zero issued and outstanding at December 31, 2018 and 2017 | $	$ 62,900
North Valley Bancorp
Class of Stock [Line Items]
Number of subsidiary business trusts | Trust	3
Number of locations acquired | Location	3

Junior Subordinated Debt - Summ

Junior Subordinated Debt - Summary of Terms and Recorded Balance of Subordinated Debenture (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Subordinated Borrowing [Line Items]
Face Value	$ 62,889
Recorded Book Value	$ 57,232	$ 57,042
TriCo Cap Trust I
Subordinated Borrowing [Line Items]
Maturity Date	Oct. 7, 2033
Face Value	$ 20,619
Current Coupon Rate	5.04%
Recorded Book Value	$ 20,619	20,619
TriCo Cap Trust II
Subordinated Borrowing [Line Items]
Maturity Date	Jul. 23, 2034
Face Value	$ 20,619
Current Coupon Rate	4.48%
Recorded Book Value	$ 20,619	20,619
North Valley Trust II
Subordinated Borrowing [Line Items]
Maturity Date	Apr. 24, 2033
Face Value	$ 6,186
Current Coupon Rate	5.16%
Recorded Book Value	$ 5,215	5,174
North Valley Trust III
Subordinated Borrowing [Line Items]
Maturity Date	Apr. 24, 2034
Face Value	$ 5,155
Current Coupon Rate	4.73%
Recorded Book Value	$ 4,118	4,079
North Valley Trust IV
Subordinated Borrowing [Line Items]
Maturity Date	Mar. 15, 2036
Face Value	$ 10,310
Current Coupon Rate	3.22%
Recorded Book Value	$ 6,661	$ 6,551
LIBOR PLUS | TriCo Cap Trust I
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	3.05%
LIBOR PLUS | TriCo Cap Trust II
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	2.55%
LIBOR PLUS | North Valley Trust II
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	3.25%
LIBOR PLUS | North Valley Trust III
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	2.80%
LIBOR PLUS | North Valley Trust IV
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	1.33%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)
Conversion of Stock [Line Items]
Reserves to satisfy Federal regulatory requirements	$ 136,370,000	$ 119,317,000
Rent expense under operating leases		6,348,000	$ 5,885,000
Rent expense offset by rent income		$ 42,000	$ 44,000
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
Common stock, shares outstanding (in shares) | shares	30,523,824	30,417,223
Conversion ratio	1.6228
Common Class B
Conversion of Stock [Line Items]
Common stock, shares outstanding (in shares) | shares	13,396
Common Class A
Conversion of Stock [Line Items]
The value of the Class A shares | $ / shares	$ 187.90
Value of unredeemed Class A equivalent shares	$ 4,085,000

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Bank's Commitments and Contingent Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit
Real estate construction loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	222,998	248,996
Real estate mortgage loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	188,959	140,292
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	12,014	11,346
Commercial
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	363,793	306,191
Consumer loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	533,576	496,575
Deposit account overdraft privilege
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 110,402	$ 111,956

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 12, 2019	Dec. 31, 2016
Class of Stock [Line Items]
Cash dividends received	$ 32,669,000	$ 26,432,000	$ 19,236,000
Repurchase of common stock (in shares)				1,525,000
Stock repurchase plan percentage of common stock				5.00%
Common stock, shares outstanding (in shares)	30,523,824	30,417,223
Stock repurchase plan, number of shares repurchased (in shares)	0	196,566	0
Shares repurchased, fair value		$ 968,000
Market value of shares repurchased under equity compensation plans	$ 5,108,000	$ 1,486,000	$ 2,225,000
Stock options
Class of Stock [Line Items]
Company's common stock in lieu of cash to exercise options to purchase shares (in shares)	115,954	59,025	92,410
Other share-based awards
Class of Stock [Line Items]
Company's common stock in lieu of cash to exercise options to purchase shares (in shares)	15,242	45,964	14,980
Maximum
Class of Stock [Line Items]
Amount available to dividend to holding company	$ 131,000,000
2007 Stock Repurchase Plan
Class of Stock [Line Items]
Cumulative number of shares repurchased (in shares)	0
Stock repurchase plan, number of shares repurchased (in shares)		26,966	26,966
Common Stock
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)	30,523,824	30,417,223	22,955,963		22,867,802
Stock repurchase plan, number of shares repurchased (in shares)	131,196	104,989	107,390
Market value of shares repurchased under equity compensation plans	$ 5,108,000	$ 3,001,000	$ 3,854,000

Stock Options and Other Equit_3

Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options under the plan (in shares)	160,500	343,000	446,400
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units outstanding expected to vest	51,312	45,536
Weighted-average remaining contractual term	1 year 3 months 18 days
Pre-tax compensation costs	$ 903,445
Number of units released	22,237
Restricted Stock Units (RSUs) | Service Condition Vesting RSUs
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units outstanding expected to vest	68,597	66,947
Weighted-average remaining contractual term	1 year 7 months 6 days
Pre-tax compensation costs	$ 1,837,304
Number of units released	33,060
Minimum | Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units released	0
Maximum | Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units released	76,968
2009 Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options under the plan (in shares)	160,500
Options available for grant under the plan	1,315,537
2009 Plan | Restricted Stock Units (RSUs)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units outstanding expected to vest	60,747
RSUs outstanding	59,162
2001 Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options available for grant under the plan	0

Stock Options and Other Equit_4

Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, Number of Shares, beginning balance (in shares)	343,000
Options granted, Number of Shares (in shares)	0
Options exercised, Number of Shares (in shares)	(182,500)	(100,400)
Options forfeited, Number of Shares (in shares)	0	(3,000)
Options outstanding, Number of Shares, ending balance (in shares)	160,500	343,000
Options outstanding, Weighted Average Exercise Price, beginning balance (in dollars per share)	$ 16.67
Options granted, Weighted Average Exercise Price (in dollars per share)	0
Options exercised, Weighted Average Exercise Price (in dollars per share)	16	$ 16.97
Options forfeited, Weighted Average Exercise Price (in dollars per share)	0	23.21
Options outstanding, Weighted Average Exercise Price, ending balance (in dollars per share)	17.60	16.67
Minimum
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 exercised, Option Price per Share	12.63
Options outstanding, Option Price per Share, ending balance	12.63	12.63
Maximum
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 exercised, Option Price per Share	19.46
Options outstanding, Option Price per Share, ending balance	$ 23.21	$ 23.21

Stock Options and Other Equit_5

Stock Options and Other Equity-Based Incentive Instruments - Summary of Options Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options (in shares)	160,500	343,000	446,400
Weighted average exercise price (in dollars per share)	$ 17.60	$ 16.67	$ 16.84
Intrinsic value (in thousands)	$ 3,726
Weighted average remaining contractual term (yrs.)	2 years 9 months
Currently Exercisable
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options (in shares)	160,500
Weighted average exercise price (in dollars per share)	$ 17.60
Intrinsic value (in thousands)	$ 3,726
Weighted average remaining contractual term (yrs.)	2 years 9 months
Currently Not Exercisable
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options (in shares)	0
Weighted average exercise price (in dollars per share)	$ 0
Intrinsic value (in thousands)	$ 0
Weighted average remaining contractual term (yrs.)	0 years

Stock Options and Other Equit_6

Stock Options and Other Equity-Based Incentive Instruments - Information about Options (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Information about Options
Intrinsic value of options exercised	$ 4,169	$ 2,109	$ 2,657
Fair value of options that vested	0	75	259
Total compensation costs for options recognized in expense	0	75	259
Excess tax benefit recognized in income	0	22	109
ASU 2016-09
Information about Options
Excess tax benefit recognized in income	$ 1,233	$ 623	$ 600

Stock Options and Other Equit_7

Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Service Condition Vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding, Number of RSUs, beginning balance	66,947
RSUs granted, Number of RSUs	35,273
RSUs added through dividend credits, Number of RSUs	1,314
RSUs released through vesting, Number of RSUs	(33,060)
RSUs forfeited/expired, Number of RSUs	(1,877)
RSUs outstanding, Number of RSUs, ending balance	68,597
RSUs granted, Weighted Average Fair Value on Date of Grant (in dollars per share) | $ / shares	$ 37.41
Market Plus Service Condition Vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding, Number of RSUs, beginning balance	45,536
RSUs granted, Number of RSUs	22,899
Additional market plus service condition RSUs vested, Number of RSUs	7,414
RSUs released through vesting, Number of RSUs	(22,237)
RSUs forfeited/expired, Number of RSUs	(2,300)
RSUs outstanding, Number of RSUs, ending balance	51,312
RSUs granted, Weighted Average Fair Value on Date of Grant (in dollars per share) | $ / shares	$ 31.60

Stock Options and Other Equit_8

Stock Options and Other Equity-Based Incentive Instruments - Summary of Compensation Costs and Excess Tax Benefits for RSUs (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Service Condition Vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation costs for RSUs recognized in income	$ 1,161,237	$ 1,017,000	$ 895,000
Excess tax benefit recognized in income Service condition vesting RSUs	141,000	104,000	131,000
Market Plus Service Condition Vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation costs for RSUs recognized in income	493,000	370,000	432,000
Excess tax benefit recognized in income Service condition vesting RSUs	$ 146,000	$ 191,000	$ 175,000

Noninterest Income and Expens_2

Noninterest Income and Expense - Components of Other Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									$ 40,417	$ 38,460	$ 37,423
Commissions on sale of non-deposit investment products									2,877	3,151	2,729
Increase in cash value of life insurance									3,029	2,718	2,685
Gain on sale of loans									3,282	2,371	3,109
Lease brokerage income									878	678	782
Sale of customer checks									529	449	372
Gain on sale of investment securities									110	207	961
Gain (loss) on marketable equity securities									86	(64)	0
Other									2,312	1,091	1,391
Total other noninterest income									13,103	10,601	12,029
Total noninterest income	$ 14,186	$ 14,108	$ 13,423	$ 11,803	$ 12,634	$ 12,186	$ 12,174	$ 12,290	53,520	49,061	49,452
ATM and interchange fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									20,639	18,249	16,727
Service charges on deposit accounts
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									16,657	15,467	16,056
Other service fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									3,015	2,852	3,282
Mortgage banking service fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									1,917	2,038	2,076
Change in value of mortgage loan servicing rights
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									$ (1,811)	$ (146)	$ (718)

Noninterest Income and Expens_3

Noninterest Income and Expense - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Mortgage loan servicing fees, net of change in fair value of mortgage loan servicing rights	$ 106	$ 1,892	$ 1,358

Noninterest Income and Expens_4

Noninterest Income and Expense - Components of Noninterest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Base salaries, net of deferred loan origination costs									$ 70,218	$ 62,422	$ 54,589
Incentive compensation									13,106	11,147	9,227
Benefits and other compensation costs									22,741	20,373	19,114
Total salaries and benefits expense									106,065	93,942	82,930
Occupancy									14,893	12,139	10,894
Data processing and software									13,517	11,021	10,448
Equipment									7,022	6,651	7,141
ATM and POS network charges									5,447	5,271	4,752
Merger and acquisition expense									0	5,227	530
Advertising									5,633	4,578	4,101
Professional fees									3,754	3,546	3,745
Intangible amortization									5,723	3,499	1,389
Telecommunications									3,190	3,023	2,713
Regulatory assessments and insurance									1,188	1,906	1,676
Courier service									1,308	1,287	1,035
Operational losses									986	1,260	1,394
Postage									1,258	1,154	1,296
Gain on sale of real estate owned									(246)	(408)	(711)
Loss on disposal of fixed assets									82	185	142
Other miscellaneous expense									15,637	14,191	12,980
Total other noninterest expense									79,392	74,530	63,525
Total noninterest expense	$ 46,964	$ 46,344	$ 46,697	$ 45,452	$ 45,285	$ 47,378	$ 37,870	$ 38,162	$ 185,457	$ 168,472	$ 146,455

Income Taxes - Components of Co

Income Taxes - Components of Consolidated Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current tax expense
Federal									$ 20,403	$ 13,109	$ 17,835
State									12,655	9,323	6,650
Current tax expense, Total									33,058	22,432	24,485
Deferred tax expense
Federal									695	1,842	11,418
State									997	758	1,055
Deferred tax benefit, Total									1,692	2,600	12,473
Total tax expense	$ 8,826	$ 9,386	$ 7,443	$ 9,095	$ 7,334	$ 6,476	$ 5,782	$ 5,440	$ 34,750	$ 25,032	$ 36,958

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes (Textual) [Abstract]
Federal corporate tax rate	21.00%	21.00%	35.00%
Deferred tax expense for change in tax law			$ 7,416,000
Accelerated amortization expense due to change in tax law			$ 226,000
Carrying value of low income housing tax credit funds	$ 28,480,000	$ 23,885,000
Low income housing tax credit fund commitments	13,137,000
Tax credits	576,000	$ 623,000
Federal
Income Taxes (Textual) [Abstract]
Net operating loss carryforwards	0
Tax credits	63,000
California
Income Taxes (Textual) [Abstract]
Net operating loss carryforwards	18,590,000
Tax credits	$ 648,000

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Investments in Qualified Affordable Housing Projects (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax credits and other tax benefits – decrease in tax expense	$ (2,546)	$ (1,993)	$ (1,753)
Amortization – increase in tax expense	$ 2,705	$ 1,814	$ 1,611

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	21.00%	21.00%	35.00%
State income taxes, net of federal tax benefit	7.90%	8.60%	6.90%
Tax Cuts and Jobs Act impact of federal rate change	0.00%	0.00%	9.60%
Tax-exempt interest on municipal obligations	(0.70%)	(1.00%)	(1.90%)
Tax-exempt life insurance related income	(0.60%)	(0.60%)	(1.30%)
Low income housing tax credits	(2.30%)	(2.20%)	(2.30%)
Low income housing tax credit amortization	2.10%	2.00%	2.10%
Equity compensation	(0.40%)	(0.40%)	(1.10%)
Non-deductible merger expenses	0.00%	0.20%	0.20%
Other	0.40%	(0.80%)	0.50%
Effective Tax Rate	27.40%	26.80%	47.70%

Income Taxes - Company's Net De

Income Taxes - Company's Net Deferred Tax Asset Recorded in Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for losses and reserve for unfunded commitments	$ 9,871	$ 10,394
Deferred compensation	2,342	2,780
Accrued pension liability	3,309	9,734
Other accrued expenses	1,678	1,175
Additional unfunded status of the supplemental retirement plans	9,868	1,420
Operating lease liability	8,142
State taxes	2,441	1,864
Share based compensation	803	1,132
Nonaccrual interest	649	814
Acquisition cost basis	4,556	6,714
Unrealized loss on securities	0	6,201
Tax credits	576	623
Tax credit related to operating losses	1,578	2,442
Other	348	423
Total deferred tax assets	46,161	45,716
Deferred tax liabilities:
Securities income	(762)	(1,020)
Depreciation	(6,109)	(5,572)
Right of use asset	(8,242)
Merger related fixed asset valuations	(30)	(26)
Securities accretion	(560)	(426)
Mortgage servicing rights valuation	(1,813)	(2,073)
Core deposit intangible	(6,453)	(8,234)
Junior subordinated debt	(1,672)	(1,729)
Prepaid expenses and other	(469)	(582)
Total deferred tax liability	(27,111)	(19,662)
Net deferred tax asset	$ 19,050	$ 26,054

Earnings Per Share - Computatio

Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 22,890	$ 23,395	$ 23,061	$ 22,726	$ 23,211	$ 16,170	$ 15,029	$ 13,910	$ 92,072	$ 68,320	$ 40,554
Average number of common shares outstanding (in shares)									30,478	26,593	22,912
Effect of dilutive stock options and restricted stock (in shares)									167	287	338
Average number of common shares outstanding used to calculate diluted earnings per share (in shares)									30,645	26,880	23,250
Options excluded from diluted earnings per share because the effect of these options was antidilutive (in shares)									0	10,056	0

Comprehensive Income - Componen

Comprehensive Income - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized holding gains (losses) on available for sale securities before reclassifications	$ 24,471	$ (17,057)	$ 6,422
Amounts reclassified out of accumulated other comprehensive income:
Realized gains on debt securities	(110)	(207)	(961)
Total amounts reclassified out of accumulated other comprehensive income	(110)	(570)	(961)
Unrealized holding gains (losses) on available for sale securities after reclassifications	24,361	(17,627)	5,461
Tax effect	(7,202)	5,193	(2,296)
Unrealized holding gains (losses) on available for sale securities, net of tax	17,159	(12,434)	3,165
Change in unfunded status of the supplemental retirement plans before reclassifications	(6,745)	762	(1,016)
Amounts reclassified out of accumulated other comprehensive income:
Amortization of prior service cost	(54)	(54)	(12)
Amortization of actuarial losses	408	510	390
Total amounts reclassified out of accumulated other comprehensive income	354	(212)	378
Change in unfunded status of the supplemental retirement plans after reclassifications	(6,391)	550	(638)
Tax effect	1,889	(162)	268
Change in unfunded status of the supplemental retirement plans, net of tax	(4,502)	388	(370)
Change in joint beneficiary agreement liability before reclassifications	0	426	(110)
Tax effect	0	0	0
Change in unfunded status of the supplemental retirement plans, net of tax	0	426	(110)
Other comprehensive income (loss)	12,657	(11,620)	2,685
Adoption ASU 2016-01
Amounts reclassified out of accumulated other comprehensive income:
Total amounts reclassified out of accumulated other comprehensive income	0	62	0
Adoption ASU 2018-02
Amounts reclassified out of accumulated other comprehensive income:
Total amounts reclassified out of accumulated other comprehensive income	0	(425)	0
Amounts reclassified out of accumulated other comprehensive income:
Total amounts reclassified out of accumulated other comprehensive income	$ 0	$ (668)	$ 0

Comprehensive Income - Compon_2

Comprehensive Income - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effect		$ (1,420)
Accumulated other comprehensive loss, net of tax	$ (5,222)	(17,879)
Net unrealized gain (loss) on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent	3,387	(20,974)
Tax effect	(1,001)	6,201
Accumulated other comprehensive loss, net of tax	2,386	(14,773)
Unfunded status of the supplemental retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent	(11,193)	(4,802)
Tax effect	3,309	1,420
Accumulated other comprehensive loss, net of tax	(7,884)	(3,382)
Joint beneficiary agreement liability, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent	$ 276	$ 276

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Employee service period under ESOP	1 year
Deferred compensation obligations	$ 7,923	$ 9,402
Cash values of the insurance policies purchased to fund deferred compensation obligations	117,823	117,318	$ 97,783
Unfunded status of the supplemental retirement plans	(11,193)	(4,802)
Deferred tax asset		1,420
Net actuarial loss	$ 2,984
401(k) Plan
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%
Supplemental Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Cash values of the insurance policies purchased to fund deferred compensation obligations	$ 117,823	117,318
Unfunded status of the supplemental retirement plans	11,193	4,802
Accumulated other comprehensive loss	7,884	$ 3,382
Deferred tax asset	$ 3,309

Retirement Plans - Summary of 4

Retirement Plans - Summary of 401(k) Contribution Plan (Detail) - 401(k) Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
401(k) Plan benefits expense	$ 1,119	$ 879	$ 776
401(k) Plan contributions made by the Company	$ 1,003	$ 872	$ 767

Retirement Plans - Summary of E

Retirement Plans - Summary of ESOP Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
ESOP benefits expense	$ 2,500	$ 1,887	$ 2,149
ESOP contributions made by the Company	$ 1,875	$ 1,952	$ 2,073

Retirement Plans - Schedule of

Retirement Plans - Schedule of Deferred Compensation Earnings Credits Included in Noninterest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Deferred compensation earnings credits included in non-interest expense	$ 363	$ 462	$ 478

Retirement Plans - Defined Bene

Retirement Plans - Defined Benefit Pension Plans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Transition obligation	$ 1	$ 3
Prior service cost	(141)	(194)
Net actuarial loss	11,333	4,993
Amount included in accumulated other comprehensive loss	11,193	4,802
Deferred tax benefit	(3,309)	(1,420)
Amount included in accumulated other comprehensive loss, net of tax	$ 7,884	$ 3,382

Retirement Plans - Information

Retirement Plans - Information Pertaining to Activity in Supplemental Retirement Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in benefit obligation:
Benefit obligation at beginning of year	$ (29,196)	$ (28,472)
Service cost	(879)	(973)	$ (941)
Interest cost	(1,131)	(949)	(991)
Actuarial (loss)/gain	(6,747)	92
Plan amendments	0	0
Benefits paid	1,216	1,106
Benefit obligation at end of year	(36,737)	(29,196)	(28,472)
Change in plan assets:
Fair value of plan assets at beginning of year	0	0
Fair value of plan assets at end of year	0	0	$ 0
Funded status	(36,737)	(29,196)
Unrecognized net obligation existing at January 1, 1986	1	3
Unrecognized net actuarial loss	11,333	4,993
Unrecognized prior service cost	(141)	(194)
Accumulated other comprehensive income	(11,193)	(4,802)
Accrued benefit cost	(36,737)	(29,196)
Accumulated benefit obligation	$ (35,981)	$ (27,544)

Retirement Plans - Net Periodic

Retirement Plans - Net Periodic Benefit Cost Recognized for Supplemental Retirement Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net pension cost included the following components:
Service cost-benefits earned during the period	$ 879	$ 973	$ 941
Interest cost on projected benefit obligation	1,131	949	991
Amortization of net obligation at transition	2	2	2
Amortization of prior service cost	(54)	(54)	(12)
Recognized net actuarial loss	408	510	390
Net periodic pension cost	$ 2,366	$ 2,380	$ 2,312

Retirement Plans - Assumptions

Retirement Plans - Assumptions Used in Accounting for Plans (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	2.82%	3.96%	3.40%
Discount rate used to calculate net periodic pension cost	3.96%	3.40%	3.80%
Executive Compensation
Defined Benefit Plan Disclosure [Line Items]
Average annual increase in compensation	3.25%	3.25%	3.25%
Director Compensation
Defined Benefit Plan Disclosure [Line Items]
Average annual increase in compensation	0.00%	0.00%	0.00%

Retirement Plans - Expected Ben

Retirement Plans - Expected Benefit Payments to Participants and Estimated Contributions to be Made by Company (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Retirement Benefits [Abstract]
Expected Benefit Payments to Participants, 2020	$ 1,555
Expected Benefit Payments to Participants, 2021	2,128
Expected Benefit Payments to Participants, 2022	2,179
Expected Benefit Payments to Participants, 2023	2,179
Expected Benefit Payments to Participants, 2024	2,191
Expected Benefit Payments to Participants, 2025-2029	10,956
Estimated Company Contributions, 2020	1,555
Estimated Company Contributions, 2021	2,128
Estimated Company Contributions, 2022	2,179
Estimated Company Contributions, 2023	2,179
Estimated Company Contributions, 2024	2,193
Estimated Company Contributions, 2025-2029	$ 10,956

Related Party Transactions - Su

Related Party Transactions - Summary of Activity in Lending Transactions (Detail) - Directors and Officers [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Beginning balance	$ 9,203	$ 2,148
Advances/new loans	9,032	8,854
Removed/payments	(8,114)	(1,799)
Ending balance	$ 10,121	$ 9,203

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Related Party Transactions [Abstract]
Bank deposits of directors, officers and other related parties	$ 41,647	$ 43,881

Fair Value Measurement - Record

Fair Value Measurement - Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 6,200	$ 7,098
Fair Value Measurements on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	964,563	1,128,695
Fair Value Measurements on Recurring Basis | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,960	2,874
Fair Value Measurements on Recurring Basis | Obligations of U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	472,980	629,981
Fair Value Measurements on Recurring Basis | Obligations of states and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	109,601	126,072
Fair Value Measurements on Recurring Basis | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,532
Fair Value Measurements on Recurring Basis | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	365,025
Fair Value Measurements on Recurring Basis | Loans Held For Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	5,265	3,687
Fair Value Measurements on Recurring Basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,960	2,874
Fair Value Measurements on Recurring Basis | Level 1 | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,960	2,874
Fair Value Measurements on Recurring Basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	955,403	1,118,723
Fair Value Measurements on Recurring Basis | Level 2 | Obligations of U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	472,980	629,981
Fair Value Measurements on Recurring Basis | Level 2 | Obligations of states and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	109,601	126,072
Fair Value Measurements on Recurring Basis | Level 2 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,532
Fair Value Measurements on Recurring Basis | Level 2 | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	365,025
Fair Value Measurements on Recurring Basis | Level 2 | Loans Held For Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	5,265	3,687
Fair Value Measurements on Recurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	6,200	7,098
Fair Value Measurements on Recurring Basis | Level 3 | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 6,200	$ 7,098

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Transfers between any fair value levels	$ 0	$ 0
Carrying value of loans fully charged-off	$ 0

Fair Value Measurement - Reconc

Fair Value Measurement - Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs on Recurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 7,098
Ending Balance		$ 7,098
Mortgage servicing rights
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	7,098	6,687	$ 6,595
Transfers into (out of) Level 3	0	0	0
Change Included in Earnings	(1,811)	(146)	(718)
Issuances	913	557	810
Ending Balance	$ 6,200	$ 7,098	$ 6,687

Fair Value Measurement - Assets

Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Impaired Originated And PNCI Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 1,055	$ 281
Fair Value Nonrecurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	1,472	1,592
Total Gains (Losses)	(679)	(302)
Fair Value Nonrecurring Basis | Impaired Originated And PNCI Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	1,055	281
Total Gains (Losses)	(652)	(294)
Fair Value Nonrecurring Basis | Foreclosed Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	417	1,311
Total Gains (Losses)	(27)	(8)
Fair Value Nonrecurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	1,472	1,592
Fair Value Nonrecurring Basis | Level 3 | Impaired Originated And PNCI Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	1,055	281
Fair Value Nonrecurring Basis | Level 3 | Foreclosed Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 417	$ 1,311

Fair Value Measurement - Quanti

Fair Value Measurement - Quantitative Information about Recurring Fair Value Measurements (Detail) $ in Thousands	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 6,200	$ 7,098
Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 6,200	$ 7,098	$ 6,687	$ 6,595
Minimum | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	0.273	0.420
Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	0.12	0.140
Maximum | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	0.076	0.110
Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	0.13	0.120
Weighted Average | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	0.050	0.062
Weighted Average | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	0.12	0.100

Fair Value Measurement - Quan_2

Fair Value Measurement - Quantitative Information about Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Impaired Originated And PNCI Loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ 1,055	$ 281
Foreclosed Assets | Residential Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ 417	693
Foreclosed Assets | Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value		$ 618
Level 3 | Sales Comparison Approach | Minimum | Impaired Originated And PNCI Loans | Adjustment for differences between comparable sales
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financial Instruments, Measurement Input		7400.00%
Level 3 | Sales Comparison Approach | Minimum | Foreclosed Assets | Residential Real Estate | Adjustment for differences between comparable sales
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financial Instruments, Measurement Input		4700.00%
Level 3 | Sales Comparison Approach | Minimum | Foreclosed Assets | Commercial Real Estate | Adjustment for differences between comparable sales
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financial Instruments, Measurement Input		8400.00%
Level 3 | Sales Comparison Approach | Maximum | Impaired Originated And PNCI Loans | Adjustment for differences between comparable sales
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financial Instruments, Measurement Input		2300.00%
Level 3 | Sales Comparison Approach | Maximum | Foreclosed Assets | Residential Real Estate | Adjustment for differences between comparable sales
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financial Instruments, Measurement Input		3900.00%
Level 3 | Sales Comparison Approach | Maximum | Foreclosed Assets | Commercial Real Estate | Adjustment for differences between comparable sales
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financial Instruments, Measurement Input		1900.00%
Level 3 | Sales Comparison Approach | Weighted Average | Impaired Originated And PNCI Loans | Adjustment for differences between comparable sales
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financial Instruments, Measurement Input		1976.00%
Level 3 | Sales Comparison Approach | Weighted Average | Foreclosed Assets | Residential Real Estate | Adjustment for differences between comparable sales
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financial Instruments, Measurement Input		313.00%
Level 3 | Sales Comparison Approach | Weighted Average | Foreclosed Assets | Commercial Real Estate | Adjustment for differences between comparable sales
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financial Instruments, Measurement Input		8400.00%

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 ($)	Dec. 31, 2019	Dec. 31, 2018
Financial assets:
Cash and due from banks	$ 92,816,000	$ 119,781,000
Cash at Federal Reserve and other banks	183,691,000	107,752,000
Securities held to maturity	375,606,000	444,936,000
Restricted equity securities	0	0
Financial liabilities:
Other borrowings	18,454,000	15,839,000
Junior subordinated debt	57,232,000	57,042,000
Level 3 | Overdraft privilege commitments
Off-balance sheet:
Contract amount, Off-balance sheet	110,402,000	111,956,000
Level 3 | Standby letters of credit
Off-balance sheet:
Contract amount, Off-balance sheet	12,014,000	11,346,000
Level 3 | Commitments
Off-balance sheet:
Contract amount, Off-balance sheet	1,309,326,000	1,192,054,000
Fair Value | Level 1
Financial assets:
Cash and due from banks	92,816,000	119,781,000
Cash at Federal Reserve and other banks	183,691,000	107,752,000
Fair Value | Level 2
Financial assets:
Securities held to maturity	381,525,000	437,370,000
Financial liabilities:
Deposits	5,365,921,000	5,362,173,000
Other borrowings	18,454,000	15,839,000
Fair Value | Level 3
Financial assets:
Loans, net	4,263,064,000	4,006,986,000
Financial liabilities:
Junior subordinated debt	56,297,000	62,610,000
Fair Value | Level 3 | Overdraft privilege commitments
Off-balance sheet:
Fair value, Off-balance sheet	1,104,000	1,120,000
Fair Value | Level 3 | Standby letters of credit
Off-balance sheet:
Fair value, Off-balance sheet	120,000	113,000
Fair Value | Level 3 | Commitments
Off-balance sheet:
Fair value, Off-balance sheet	13,093,000	11,921,000
Carrying Amount | Level 1
Financial assets:
Cash and due from banks	92,816,000	119,781,000
Cash at Federal Reserve and other banks	183,691,000	107,752,000
Carrying Amount | Level 2
Financial assets:
Securities held to maturity	375,606,000	444,936,000
Restricted equity securities	17,250,000	17,250,000
Financial liabilities:
Deposits	5,366,994,000	5,366,466,000
Other borrowings	18,454,000	15,839,000
Carrying Amount | Level 3
Financial assets:
Loans, net	4,276,750,000	3,989,432,000
Financial liabilities:
Junior subordinated debt	$ 57,232,000	$ 57,042,000

TriCo Bancshares Condensed Fi_3

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 276,507	$ 227,533
Other assets	70,591	75,364
Total assets	6,471,181	6,352,441
Liabilities and shareholders' equity
Other liabilities	91,984	83,724
Junior subordinated debt	57,232	57,042
Total liabilities	5,564,611	5,525,068
Shareholders' equity
Preferred stock, no par value: 1,000,000 shares authorized, zero issued and outstanding at December 31, 2018 and 2017	0	0
Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 30,417,223 and 22,955,963 shares at December 31, 2018 and 2017, respectively	543,998	541,762
Retained earnings	367,794	303,490
Accumulated other comprehensive loss, net	(5,222)	(17,879)
Total shareholders’ equity	906,570	827,373	$ 505,808	$ 477,347
Total liabilities and shareholders’ equity	6,471,181	6,352,441
Parent
Assets
Cash and cash equivalents	5,008	2,374
Investment in Tri Counties Bank	957,544	880,907
Other assets	1,765	1,723
Total assets	964,317	885,004
Liabilities and shareholders' equity
Other liabilities	515	589
Junior subordinated debt	57,232	57,042
Total liabilities	57,747	57,631
Shareholders' equity
Preferred stock, no par value: 1,000,000 shares authorized, zero issued and outstanding at December 31, 2018 and 2017	0	0
Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 30,417,223 and 22,955,963 shares at December 31, 2018 and 2017, respectively	543,998	541,762
Retained earnings	367,794	303,490
Accumulated other comprehensive loss, net	(5,222)	(17,879)
Total shareholders’ equity	906,570	827,373
Total liabilities and shareholders’ equity	$ 964,317	$ 885,004

TriCo Bancshares Condensed Fi_4

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets, Nonprinting (Detail) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	30,523,824	30,417,223
Common stock, shares outstanding (in shares)	30,523,824	30,417,223

TriCo Bancshares Condensed Fi_5

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Interest expense	$ (3,722)	$ (4,201)	$ (3,865)	$ (3,587)	$ (4,063)	$ (4,065)	$ (2,609)	$ (2,135)	$ (15,375)	$ (12,872)	$ (6,798)
Income before income taxes	31,716	32,781	30,504	31,821	30,545	22,646	20,811	19,350	126,822	93,352	77,512
Equity in net income of Tri Counties Bank:
Income tax benefit	(8,826)	(9,386)	(7,443)	(9,095)	(7,334)	(6,476)	(5,782)	(5,440)	(34,750)	(25,032)	(36,958)
Net income	$ 22,890	$ 23,395	$ 23,061	$ 22,726	$ 23,211	$ 16,170	$ 15,029	$ 13,910	92,072	68,320	40,554
Parent
Condensed Financial Statements, Captions [Line Items]
Interest expense									(3,272)	(3,131)	(2,535)
Administration expense									(877)	(1,489)	(915)
Income before income taxes									(4,149)	(4,620)	(3,450)
Equity in net income of Tri Counties Bank:
Distributed									32,669	26,432	19,236
Undistributed									62,326	45,315	23,359
Income tax benefit									1,226	1,193	1,409
Net income									$ 92,072	$ 68,320	$ 40,554

TriCo Bancshares Condensed Fi_6

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income	$ 22,890	$ 23,395	$ 23,061	$ 22,726	$ 23,211	$ 16,170	$ 15,029	$ 13,910	$ 92,072	$ 68,320	$ 40,554
Other comprehensive income (loss), net of tax:
Increase (decrease) in unrealized gains on available for sale securities arising during the period									17,159	(12,434)	3,165
Change in minimum pension liability									(4,502)	388	(370)
Change in joint beneficiary agreement liablity									0	426	(110)
Other comprehensive income (loss)									12,657	(11,620)	2,685
Comprehensive income									104,729	56,700	43,239
Parent
Condensed Financial Statements, Captions [Line Items]
Net income									92,072	68,320	40,554
Other comprehensive income (loss), net of tax:
Increase (decrease) in unrealized gains on available for sale securities arising during the period									17,159	(12,434)	3,165
Change in minimum pension liability									(4,502)	388	(370)
Change in joint beneficiary agreement liablity									0	426	(110)
Other comprehensive income (loss)									12,657	(11,620)	2,685
Comprehensive income									$ 104,729	$ 56,700	$ 43,239

TriCo Bancshares Condensed Fi_7

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income	$ 92,072	$ 68,320	$ 40,554
Adjustments to reconcile net income to net cash provided by operating activities:
Equity compensation vesting expense	1,654	1,462	1,586
Net cash from operating activities	102,806	91,069	55,381
Financing activities
Issuance of common stock through option exercise	9	218	396
Repurchase of common stock, net	(2,196)	(2,483)	(1,629)
Cash dividends paid — common	(24,999)	(18,769)	(15,131)
Net cash from financing activities	(24,043)	73,039	201,880
Net change in cash and cash equivalents	48,974	22,105	(100,184)
Cash and cash equivalents at beginning of year	227,533	205,428	305,612
Cash and cash equivalents at end of year	276,507	227,533	205,428
Parent
Operating activities
Net income	92,072	68,320	40,554
Adjustments to reconcile net income to net cash provided by operating activities:
Undistributed equity in earnings of Tri Counties Bank	(62,326)	(45,315)	(23,359)
Equity compensation vesting expense	1,654	1,462	1,586
Net change in other assets and liabilities	(1,580)	(4,983)	(1,295)
Net cash from operating activities	29,820	19,484	17,486
Financing activities
Issuance of common stock through option exercise	9	218	396
Repurchase of common stock, net	(2,196)	(2,483)	(1,629)
Cash dividends paid — common	(24,999)	(18,769)	(15,131)
Net cash from financing activities	(27,186)	(21,034)	(16,364)
Net change in cash and cash equivalents	2,634	(1,550)	1,122
Cash and cash equivalents at beginning of year	2,374	3,924	2,802
Cash and cash equivalents at end of year	$ 5,008	$ 2,374	$ 3,924

Regulatory Matters - Actual and

Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Parent
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 753,200	$ 682,419
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	719,809	647,262
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	664,296	591,933
Tier 1 Capital (to Average Assets), Actual, Amount	$ 719,809	$ 647,262
Total Capital (to Risk Weighted Assets), Actual, Ratio	15.07%	14.40%
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	14.40%	13.66%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.29%	12.49%
Tier 1 Capital (to Average Assets), Actual, Ratio	11.55%	10.68%
Parent | Required for Capital Adequacy Purposes
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 524,944	$ 497,486
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	424,955	402,727
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	349,963	331,658
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 249,343	$ 242,452
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%
Tri Counties Bank
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 748,660	$ 680,624
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	715,269	645,467
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	715,269	645,467
Tier 1 Capital (to Average Assets), Actual, Amount	$ 715,269	$ 645,467
Total Capital (to Risk Weighted Assets), Actual, Ratio	14.98%	14.37%
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	14.31%	13.63%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	14.31%	13.63%
Tier 1 Capital (to Average Assets), Actual, Ratio	11.47%	10.65%
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 499,770	$ 473,624
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	399,816	378,899
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	324,851	307,856
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 311,672	$ 303,059
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 Counties Bank | Required for Capital Adequacy Purposes
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 524,759	$ 497,305
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	424,805	402,581
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	349,839	331,537
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 249,337	$ 242,447
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 Results _3

Summary of Quarterly Results of Operations (Unaudited) - Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans:
Discount accretion	$ 2,218	$ 2,360	$ 1,904	$ 1,655	$ 1,982	$ 2,098	$ 559	$ 632
All other loan interest income	54,644	54,639	53,587	52,743	53,680	51,004	38,745	37,417
Total loan interest income	56,862	56,999	55,491	54,398	55,662	53,102	39,304	38,049	$ 223,750	$ 186,117	$ 146,794
Debt securities, dividends and interest bearing cash at banks	11,056	11,890	12,689	13,059	12,403	11,452	9,174	9,072
Total interest and dividend income	67,918	68,889	68,180	67,457	68,065	64,554	48,478	47,121	272,444	228,218	181,402
Interest expense	3,722	4,201	3,865	3,587	4,063	4,065	2,609	2,135	15,375	12,872	6,798
Net interest income	64,196	64,688	64,315	63,870	64,002	60,489	45,869	44,986	257,069	215,346	174,604
(Benefit from reversal of) provision for loan losses	(298)	(329)	537	(1,600)	806	2,651	(638)	(236)	(1,690)	2,583	89
Net interest income after provision for (benefit from) loan losses	64,494	65,017	63,778	65,470	63,196	57,838	46,507	45,222	258,759	212,763	174,515
Noninterest income	14,186	14,108	13,423	11,803	12,634	12,186	12,174	12,290	53,520	49,061	49,452
Noninterest expense	46,964	46,344	46,697	45,452	45,285	47,378	37,870	38,162	185,457	168,472	146,455
Income before income taxes	31,716	32,781	30,504	31,821	30,545	22,646	20,811	19,350	126,822	93,352	77,512
Income tax expense	8,826	9,386	7,443	9,095	7,334	6,476	5,782	5,440	34,750	25,032	36,958
Net income	$ 22,890	$ 23,395	$ 23,061	$ 22,726	$ 23,211	$ 16,170	$ 15,029	$ 13,910	$ 92,072	$ 68,320	$ 40,554
Per common share:
Net income (diluted)	$ 0.75	$ 0.76	$ 0.75	$ 0.74	$ 0.76	$ 0.53	$ 0.65	$ 0.60	$ 3	$ 2.54	$ 1.74
Dividends	$ 0.22	$ 0.22	$ 0.19	$ 0.19	$ 0.19	$ 0.17	$ 0.17	$ 0.17	$ 0.82	$ 0.70	$ 0.66