TriCo Bancshares (TCBK) 10-Q7 May 212021 Q1 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2021	May 06, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	000-10661
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		29,714,718
Entity Registrant Name	TriCo Bancshares
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000356171

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets:
Cash and due from banks	$ 94,157	$ 77,253
Cash at Federal Reserve and other banks	515,365	592,298
Cash and cash equivalents	609,522	669,551
Investment securities:
Marketable equity securities	2,971	3,025
Available for sale debt securities, net of allowance for credit losses of $—	1,682,105	1,414,264
Held to maturity debt securities, net of allowance for credit losses of $—	260,454	284,563
Restricted equity securities	17,250	17,250
Loans held for sale	3,995	6,268
Loans	4,966,977	4,763,127
Allowance for credit losses	(85,941)	(91,847)
Total loans, net	4,881,036	4,671,280
Premises and equipment, net	82,338	83,731
Cash value of life insurance	119,543	118,870
Accrued interest receivable	19,442	20,004
Goodwill	220,872	220,872
Other intangible assets, net	16,402	17,833
Operating leases, right-of-use	27,540	27,846
Other assets	88,142	84,172
Total assets	8,031,612	7,639,529
Deposits:
Noninterest-bearing demand	2,766,510	2,581,517
Interest-bearing	4,096,890	3,924,417
Total deposits	6,863,400	6,505,934
Accrued interest payable	970	1,362
Operating lease liability	27,780	27,973
Other liabilities	102,955	94,597
Other borrowings	36,226	26,914
Junior subordinated debt	57,742	57,635
Total liabilities	7,089,073	6,714,415
Commitments and contingencies (Note 7)
Shareholders’ equity:
Preferred stock, no par value: 1,000,000 shares authorized, zero issued and outstanding at March 31, 2021 and December 31, 2020	0	0
Common stock, no par value: 50,000,000 shares authorized; 29,727,122 and 29,727,214 issued and outstanding at March 31, 2021 and December 31, 2020, respectively	531,367	530,835
Retained earnings	408,211	381,999
Accumulated other comprehensive income, net of tax	2,961	12,280
Total shareholders’ equity	942,539	925,114
Total liabilities and shareholders’ equity	$ 8,031,612	$ 7,639,529

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Available-for-sale, allowance for credit loss	$ 0	$ 0
Held-to-maturity, allowance for credit loss	$ 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, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	29,727,122	29,727,214
Common stock, shares outstanding (in shares)	29,727,122	29,727,214

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest and dividend income:
Loans, including fees	$ 60,436	$ 56,258
Investments:
Taxable securities	6,177	8,211
Tax exempt securities	923	904
Dividends	217	361
Interest bearing cash at Federal Reserve and other banks	163	783
Total interest and dividend income	67,916	66,517
Interest expense:
Deposits	937	2,551
Other borrowings	4	5
Junior subordinated debt	535	769
Total interest expense	1,476	3,325
Net interest income	66,440	63,192
Provision for (reversal of) credit losses	(6,060)	8,070
Net interest income after credit loss provision (reversal)	72,500	55,122
Non-interest income:
Service charges and fees	10,476	9,126
Gain on sale of loans	3,247	891
Gain on sale of investment securities	0	0
Asset management and commission income	834	916
Increase in cash value of life insurance	673	720
Other	880	167
Total non-interest income	16,110	11,820
Non-interest expense:
Salaries and related benefits	25,330	27,272
Other	16,288	17,477
Total non-interest expense	41,618	44,749
Income before provision for income taxes	46,992	22,193
Provision for income taxes	13,343	6,072
Net income	$ 33,649	$ 16,121
Per share data:
Basic earnings per share (in USD per share)	$ 1.13	$ 0.53
Diluted earnings per share (in USD per share)	1.13	0.53
Dividend per share (in USD per share)	$ 0.25	$ 0.22

Condensed Consolidated Statem_2

Condensed Consolidated Statement of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 33,649	$ 16,121
Other comprehensive income (loss), net of tax:
Unrealized losses on available for sale securities arising during the period	(8,690)	(20,822)
Change in minimum pension liability	0	912
Change in joint beneficiary agreements	(629)	0
Other comprehensive income (loss)	(9,319)	(19,910)
Comprehensive income (loss)	$ 24,330	$ (3,789)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period Of Adoption, Adjusted Balance	Common Stock	Common StockCumulative Effect, Period Of Adoption, Adjusted Balance	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Retained EarningsCumulative Effect, Period Of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period Of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2019	$ 906,570	$ (12,983)	$ 893,587	$ 543,998	$ 543,998	$ 367,794	$ (12,983)	$ 354,811	$ (5,222)	$ (5,222)
Beginning balance (in shares) at Dec. 31, 2019				30,523,824	30,523,824
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,121					16,121
Other comprehensive loss	(19,910)								(19,910)
Stock options exercised	148			$ 148
Stock options exercised (in shares)				8,000
RSU vesting	297			$ 297
PSU vesting	142			$ 142
RSUs released (in shares)				362
Repurchase of common stock	(17,295)			$ (9,962)		(7,333)
Repurchase of common stock (in shares)				(558,670)
Dividends paid	(6,664)					(6,664)
Ending balance at Mar. 31, 2020	866,426			$ 534,623		356,935			(25,132)
Ending balance (in shares) at Mar. 31, 2020				29,973,516
Beginning balance at Dec. 31, 2020	$ 925,114			$ 530,835		381,999			12,280
Beginning balance (in shares) at Dec. 31, 2020	29,727,214			29,727,214
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 33,649					33,649
Other comprehensive loss	$ (9,319)								(9,319)
Stock options exercised (in shares)	0
RSU vesting	$ 352			$ 352
PSU vesting	185			$ 185
RSUs released (in shares)				201
Repurchase of common stock	(10)			$ (5)		(5)
Repurchase of common stock (in shares)				(293)
Dividends paid	(7,432)					(7,432)
Ending balance at Mar. 31, 2021	$ 942,539			$ 531,367		$ 408,211			$ 2,961
Ending balance (in shares) at Mar. 31, 2021	29,727,122			29,727,122

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Common Stock
Dividends paid, per share (in USD per share)	$ 0.25	$ 0.22

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities:
Net income	$ 33,649	$ 16,121
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	1,698	1,618
Amortization of intangible assets	1,431	1,431
Provision for (reversal of) credit losses	(6,060)	8,070
Amortization of investment securities premium, net	1,186	509
Originations of loans for resale	(65,970)	(28,394)
Proceeds from sale of loans originated for resale	70,987	31,629
Gain on sale of loans	(3,247)	(891)
Change in market value of mortgage servicing rights	(12)	1,258
Gain on sale of foreclosed assets	(42)	(41)
Operating lease expense payments	(1,204)	(1,237)
Increase in cash value of life insurance	(673)	(720)
Loss (gain) on marketable equity securities	53	(47)
Equity compensation vesting expense	537	439
Change in:
Interest receivable	562	322
Interest payable	(392)	(421)
Accretion of operating lease ROUA	1,317	1,362
Other assets and liabilities, net	7,376	2,609
Net cash from operating activities	41,196	33,617
Investing activities:
Proceeds from maturities of securities available for sale	91,813	20,212
Proceeds from maturities of securities held to maturity	23,850	15,592
Purchases of securities available for sale	(372,917)	(101,899)
Loan origination and principal collections, net	(102,230)	(70,903)
Loans purchased	(101,466)	0
Proceeds from sale of other real estate owned	577	353
Purchases of premises and equipment	(188)	(761)
Net cash used by investing activities	(460,561)	(137,406)
Financing activities:
Net change in deposits	357,466	35,704
Net change in other borrowings	9,312	855
Repurchase of common stock, net of option exercises	(10)	(17,147)
Dividends paid	(7,432)	(6,664)
Net cash from financing activities	359,336	12,748
Net change in cash and cash equivalents	(60,029)	(91,041)
Cash and cash equivalents, beginning of period	669,551	276,507
Cash and cash equivalents, end of period	609,522	185,466
Supplemental disclosure of noncash activities:
Unrealized loss on securities available for sale	(12,337)	(29,561)
Market value of shares tendered in-lieu of cash to pay for exercise of options and/or related taxes	2	148
Obligations incurred in conjunction with leased assets	1,308	3,393
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	1,868	3,746
Cash paid for income taxes	$ 0	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Description of Business and Basis of Presentation TriCo Bancshares (the “Company” or “we”) is a California corporation organized to act as a bank holding company for Tri Counties Bank (the “Bank”). The Company and the Bank are headquartered in Chico, California. The Bank is a California-chartered bank that is engaged in the general commercial banking business in 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 $1,830,000 are accounted for under the equity method and, accordingly, are not consolidated and are included in other assets on the consolidated balance sheet. The subordinated debentures issued and guaranteed by the Company and held by the Capital Trusts are reflected as debt on the Company’s consolidated balance sheet. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (the “2020 Annual Report”). The Company believes that the disclosures made are adequate to make the information not misleading. 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. Reclassification Some items in the prior year consolidated financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior year net income or shareholders’ equity. Cash and Cash Equivalents Net cash flows are reported for loan and deposit transactions and other borrowings. For purposes of the consolidated statement of cash flows, cash, due from banks with original maturities less than 90 days, interest-earning deposits in other banks, and Federal funds sold are considered to be cash equivalents. Allowance for Credit Losses - Securities The Company measures expected credit losses on held-to-maturity debt securities on a collective basis by major security type, then further disaggregated by sector and bond rating. Accrued interest receivable on held-to-maturity (HTM) debt securities totaled $668,000 at March 31, 2021 and is excluded from the estimate of credit losses. The estimate of expected credit losses considers historical credit loss information that is adjusted for current condition and reasonable and supportable forecasts based on current and expected changes in credit ratings and default rates. Based on the implied guarantees of the U. S. Government or its agencies related to certain of these investment securities, and the absence of any historical or expected losses, substantially all qualify for a zero loss assumption. 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. As a result of this evaluation, management determined that the expected credit losses associated with these securities is not significant for financial reporting purposes and therefore, no allowance for credit losses has been recognized. The Company evaluates available for sale debt securities in an unrealized loss position to determine whether the decline in the fair value below the amortized cost basis (impairment) is due to credit-related factors or noncredit-related factors. Any impairment that is not credit related is recognized in other comprehensive income, net of applicable taxes. Credit-related impairment is recognized as an allowance for credit losses on the balance sheet, limited to the amount by which the amortized cost basis exceeds the fair value, with a corresponding adjustment to earnings. Both the allowance for credit losses and the adjustment to net income may be reversed if conditions change. However, if the Company intends to sell an impaired available for sale debt security or more likely than not will be required to sell such a security before recovering its amortized cost basis, the entire impairment amount is recognized in earnings with a corresponding adjustment to the security's amortized cost basis. In evaluating available for sale debt securities in unrealized loss positions for impairment and the criteria regarding its intent or requirement to sell such securities, the Company considers the extent to which fair value is less than amortized cost, whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and the results of reviews of the issuers' financial condition, among other factors. Changes in the allowance for credit losses are recorded as provision for (or reversal of) credit loss expense. Losses are charged against the ACL when management believes the uncollectability of an available for sale debt security is confirmed or when either of the criteria regarding intent or requirement to sell is met. No security credit losses were recognized during the three month periods ended March 31, 2021 and 2020, respectively. Loans Loans that management has the intent and ability to hold until maturity or payoff are reported at principle amount outstanding, net of deferred loan fees and costs. 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 a loan is placed on nonaccrual status, all interest previously accrued but not collected is reversed against interest income. 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. Accrued interest receivable is not included in the calculation of the allowance for credit losses. Allowance for Credit Losses - Loans The allowance for credit losses (ACL) is a valuation account that is deducted from the loan's amortized cost basis to present the net amount expected to be collected on the loans. Loans are charged off against the allowance when management believes the recorded loan balance is confirmed as uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. Regardless of the determination that a charge-off is appropriate for financial accounting purposes, the Company manages its loan portfolio by continually monitoring, where possible, a borrower's ability to pay through the collection of financial information, delinquency status, borrower discussion and the encouragement to repay in accordance with the original contract or modified terms, if appropriate. Management estimates the allowance balance using relevant information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. The allowance for credit losses is measured on a collective (pool) basis when similar risk characteristics exist. Historical credit loss experience provides the basis for the estimation of expected credit losses, which captures loan balances as of a point in time to form a cohort, then tracks the respective losses generated by that cohort of loans over the remaining life. The Company identified and accumulated loan cohort historical loss data beginning with the fourth quarter of 2008 and through the current period. In situations where the Company's actual loss history was not statistically relevant, the loss history of peers, defined as financial institutions with assets greater than three billion and less than ten billion, were utilized to create a minimum loss rate. Adjustments to historical loss information are made for differences in relevant current loan-specific risk characteristics, such as historical timing of losses relative to the loan origination. In its loss forecasting framework, the Company incorporates forward-looking information through the use of macroeconomic scenarios applied over the forecasted life of the assets. These macroeconomic scenarios incorporate variables that have historically been key drivers of increases and decreases in credit losses. These variables include, but are not limited to changes in environmental conditions, such as California unemployment rates, household debt levels and U.S. gross domestic product. A loan is considered to be collateral dependent when repayment is expected to be provided substantially through the operation or sale of the collateral. The ACL on collateral dependent loans is measured using the fair value of the underlying collateral, adjusted for costs to sell when applicable, less the amortized cost basis of the financial asset. If the value of underlying collateral is determined to be less than the recorded amount of the loan, a charge-off will be taken. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, is considered to be a troubled debt restructuring (TDR). The ACL on a TDR is measured using the same method as all other portfolio loans, except when the value of a concession cannot be measured using a method other than the discounted cash flow method. When the value of a concession is measured using the discounted cash flow method, the ACL is determined by discounting the expected future cash flows at the original interest rate of the loan. The Company has identified the following portfolio segments to evaluate and measure the allowance for credit loss: Commercial real estate : Commercial real estate - Non-owner occupied: These commercial properties typically consist of buildings which are leased to others for their use and rely on rents as the primary source of repayment. Property types are predominantly office, retail, or light industrial but the portfolio also has some special use properties. As such, the risk of loss associated with these properties is primarily driven by general economic changes or changes in regional economies and the impact of such on a tenant’s ability to pay. Ultimately this can affect occupancy, rental rates, or both. Additional risk of loss can come from new construction resulting in oversupply, the costs to hold or operate the property, or changes in interest rates. The terms on these loans at origination typically have maturities from five fifteen Commercial real estate - Owner occupied: These credits are primarily susceptible to changes in the financial condition of the business operated by the property owner. This may be driven by changes in, among other things, industry challenges, factors unique to the operating geography of the borrower, change in the individual fortunes of the business owner, general economic conditions and changes in business cycles. 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 more by general economic conditions, the underlying collateral may have devalued more and thus result in larger losses in the event of default. The terms on these loans at origination typically have maturities from five fifteen Multifamily: These commercial properties are generally comprised of more than four rentable units, such as apartment buildings, with each unit intended to be occupied as the primary residence for one or more persons. Multifamily properties are also subject to changes in general or regional economic conditions, such as unemployment, ultimately resulting in increased vacancy rates or reduced rents or both. In addition, new construction can create an oversupply condition and market competition resulting in increased vacancy, reduced market rents, or both. Due to the nature of their use and the greater likelihood of tenant turnover, the management of these properties is more intensive and therefore is more critical to the preclusion of loss. Farmland: While the Company has few loans that were originated for the purpose of the acquisition of these commercial properties, loans secured by farmland represent unique risks that are associated with the operation of an agricultural businesses. The valuation of farmland can vary greatly over time based on the property's access to resources including but not limited to water, crop prices, foreign exchange rates, government regulation or restrictions, and the nature of ongoing capital investment needed to maintain the quality of the property. Loans secured by farmland typically represent less risk to the Company than other agriculture loans as the real estate typically provides greater support in the event of default or need for longer term repayment. Consumer loans : SFR 1-4 1st DT Liens: The most significant drivers of potential loss within the Company's residential real estate portfolio relate general, regional, or individual changes in economic conditions and their effect on employment and borrowers cash flow. Risk in this portfolio is best measured by changes in borrower credit score and loan-to-value. Loss estimates are based on the general movement in credit score, economic outlook and its effects on employment and the value of homes and the Bank’s historical loss experience adjusted to reflect the economic outlook and the unemployment rate. SFR HELOCs and Junior Liens: Similar to residential real estate term loans, HELOCs and junior liens performance is also primarily driven by borrower cash flows based on employment status. However, HELOCs carry additional risks associated with the fact that most of these loans are secured by a deed of trust in a position that is junior to the primary lien holder. Furthermore, the risk that as the borrower's financial strength deteriorates, the outstanding balance on these credit lines may increase as they may only be canceled by the Company if certain limited criteria are met. In addition to the allowance for credit losses maintained as a percent of the outstanding loan balance, the Company maintains additional reserves for the unfunded portion of the HELOC. Other: The majority of consumer loans are secured by automobiles, with the remainder primarily unsecured revolving debt (credit cards). These loans 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, if any. 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 those factors. Credit card loans are unsecured and while collection efforts are pursued in the event of default, there is typically limited opportunity for recovery. Loss estimates are based on the general movement in credit score, economic outlook and its effects on employment and the Bank’s historical loss experience adjusted to reflect the economic outlook and the unemployment rate. Commercial and Industrial: Repayment of these loans is primarily based on the cash flow of the borrower, and secondarily on the underlying collateral provided by the borrower. A borrower's cash flow may be unpredictable, and collateral securing these loans may fluctuate in value. Most often, collateral includes accounts receivable, inventory, or equipment. Collateral securing these loans may depreciate over time, may be difficult to appraise, may be illiquid and may fluctuate in value based on the success of the business. Actual and forecast changes in gross domestic product are believed to be corollary to losses associated with these credits. Construction : While secured by real estate, construction loans represent a greater level of risk than term real estate loans due to the nature of the additional risks associated with the not only the completion of construction within an estimated time period and budget, but also the need to either sell the building or reach a level of stabilized occupancy sufficient to generate the cash flows necessary to support debt service and operating costs. The Company seeks to mitigate the additional risks associated with construction lending by requiring borrowers to comply with lower loan to value ratios and additional covenants as well as strong tertiary support of guarantors. The loss forecasting model applies the historical rate of loss for similar loans over the expected life of the asset as adjusted for macroeconomic factors. Agriculture Production: Repayment of agricultural loans is dependent upon successful operation of the agricultural business, which is greatly impacted by factors outside the control of the borrower. These factors include adverse weather conditions, including access to water, that may impact crop yields, loss of livestock due to disease or other factors, declines in market prices for agriculture products, changes in foreign exchange, and the impact of government regulations. In addition, many farms are dependent on a limited number of key individuals whose injury or death may significantly affect the successful operation of the business. Consequently, agricultural production loans may involve a greater degree of risk than other types of loans. Leases: The loss forecasting model applies the historical rate of loss for similar loans over the expected life of the asset. Leases typically represent an elevated level of credit risk as compared to loans secured by real estate as the collateral for leases is often subject to a more rapid rate of depreciation or depletion. The ultimate severity of loss is impacted by the type of collateral securing the exposure, the size of the exposure, the borrower’s industry sector, any guarantors and the geographic market. Assumptions of expected loss are conditioned to the economic outlook and the other variables discussed above. Unfunded commitments : The estimated credit losses associated with these unfunded lending commitments is calculated using the same models and methodologies noted above and incorporate utilization assumptions at time of default. The reserve for unfunded commitments is maintained on the consolidated balance sheet in other liabilities. Accounting Standards Adopted in 2021 On January 1, 2021, the Company adopted ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This ASU simplified the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The guidance also promoted consistent application and simplification of GAAP for other areas of Topic 740 by clarifying and amending existing guidance. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) was enacted in response to the Coronavirus Disease 2019 (COVID-19) pandemic. The CARES Act provides optional temporary relief from troubled debt restructuring and impairment accounting requirements for loan modifications related to the COVID-19 pandemic made during the period from March 1, 2020 to the earlier of December 31, 2020 or 60 days after the national emergency concerning COVID-19 declared by the President terminates. The applicable period for this relief was extended through 2021 by way of the Consolidated Appropriations Act. Following the passage of the CARES Act legislation, the "Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus" was issued by federal bank regulators, which similarly offers temporary relief from troubled debt restructuring accounting for loan payment deferrals for certain customers whose businesses are experiencing economic hardship due to Coronavirus. The Interagency Statement requires the modification event to be short-term and COVID-19 related, requiring the borrower be not more than 30 days past due as of the date the modification program was implemented, and allowing Management to apply judgement as when the modification program terminates. The ability to suspend TDR accounting under either program does not apply to any adverse impact on the credit of a borrower that is not related to the COVID-19 pandemic. Accounting Standards Pending Adoption FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This ASU provides temporary optional guidance to ease the potential burden in accounting for reference rate reform by providing optional expedients and exceptions for applying generally accepted accounting principles (GAAP) to contracts, hedging

Investment Securities

Investment Securities	3 Months Ended
Investment Securities	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The amortized cost, estimated fair values and allowance for credit losses of investments in debt securities are summarized in the following tables: March 31, 2021 (in thousands) Amortized Gross Gross Allowance for Credit Losses Estimated Debt Securities Available for Sale Obligations of U.S. government agencies $ 1,029,611 $ 11,056 $ (7,733) $ — $ 1,032,934 Obligations of states and political subdivisions 136,709 5,246 (1,571) — 140,384 Corporate bonds 2,466 68 — — 2,534 Asset backed securities 506,473 2,645 (2,865) — 506,253 Total debt securities available for sale $ 1,675,259 $ 19,015 $ (12,169) $ — $ 1,682,105 Debt Securities Held to Maturity Obligations of U.S. government agencies $ 250,178 $ 10,643 $ — $ — $ 260,821 Obligations of states and political subdivisions 10,276 342 — — 10,618 Total debt securities held to maturity $ 260,454 $ 10,985 $ — $ — $ 271,439 December 31, 2020 (in thousands) Amortized Gross Gross Allowance for Credit Losses Estimated Debt Securities Available for Sale Obligations of U.S. government agencies $ 795,555 $ 17,710 $ (891) $ — $ 812,374 Obligations of states and political subdivisions 123,347 5,748 — — 129,095 Corporate bonds 2,459 85 — — 2,544 Asset backed securities 473,720 1,682 (5,151) — 470,251 Total debt securities available for sale $ 1,395,081 $ 25,225 $ (6,042) $ — $ 1,414,264 Debt Securities Held to Maturity Obligations of U.S. government agencies 273,667 13,774 — $ — 287,441 Obligations of states and political subdivisions 10,896 389 — — 11,285 Total debt securities held to maturity $ 284,563 $ 14,163 $ — $ — $ 298,726 There were no sales of investment securities during the three months ended March 31, 2021 and 2020, respectively. Investment securities with an aggregate carrying value of $417,528,000 and $429,049,000 at March 31, 2021 and December 31, 2020, respectively, were pledged as collateral for specific borrowings, lines of credit or local agency deposits. The amortized cost and estimated fair value of debt securities at March 31, 2021 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 March 31, 2021, obligations of U.S. government corporations and agencies with a cost basis totaling $1,069,850,000 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 March 31, 2021, the Company estimates the average remaining life of these mortgage-backed securities issued by U.S. government corporations and agencies to be approximately 4.58 years. Average remaining life is defined as the time span after which the principal balance has been reduced by half. As of March 31, 2021, the contractual final maturity for available for sale and held to maturity investment securities is as follows: Debt Securities Available for Sale Held to Maturity (in thousands) Amortized Estimated Amortized Estimated Due in one year $ 990 $ 1,018 $ — $ — Due after one year through five years 182,664 182,915 1,003 1,118 Due after five years through ten years 262,409 262,888 21,248 21,967 Due after ten years 1,229,196 1,235,284 238,203 248,354 Totals $ 1,675,259 $ 1,682,105 $ 260,454 $ 271,439 Gross unrealized losses on debt 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: March 31, 2021: Less than 12 months 12 months or more Total (in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Debt Securities Available for Sale Obligations of U.S. government agencies $ 664,219 $ (7,733) $ — $ — $ 664,219 $ (7,733) Obligations of states and political subdivisions 38,529 (1,571) — — 38,529 (1,571) Asset backed securities 86,698 (271) 218,077 (2,594) 304,775 (2,865) Total debt securities available for sale $ 789,446 $ (9,575) $ 218,077 $ (2,594) $ 1,007,523 $ (12,169) December 31, 2020: Less than 12 months 12 months or more Total (in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Debt Securities Available for Sale Obligations of U.S. government agencies $ 160,543 $ (891) $ — $ — $ 160,543 $ (891) Asset backed securities 51,544 (441) 297,020 (4,710) 348,564 (5,151) Total debt securities available for sale $ 212,087 $ (1,332) $ 297,020 $ (4,710) $ 509,107 $ (6,042) Obligations of U.S. government agencies: The unrealized losses on investments in obligations of U.S. government agencies are caused by interest rate increases and illiquidity. 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 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, there is no impairment on these securities and there has been no allowance for credit losses recorded. At March 31, 2021, 29 debt securities representing obligations of U.S. government agencies had unrealized losses with aggregate depreciation of 1.15% 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 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, there is no impairment on these securities and there has been no allowance for credit losses recorded as of March 31, 2021. At March 31, 2021, 13 debt securities representing obligations of states and political subdivisions had unrealized losses with aggregate depreciation of 3.92% 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 for these types of securities. At the time of purchase, each of these securities was rated AA or AAA and through March 31, 2021 has not experienced any deterioration in credit rating. At March 31, 2021, 27 asset backed securities had unrealized losses with aggregate depreciation of 0.93% from the Company’s amortized cost basis. 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, there is no impairment on these securities and there has been no allowance for credit losses recorded as of March 31, 2021. The Company monitors credit quality of debt securities held-to-maturity through the use of credit rating. The Company monitors the credit rating on a monthly basis. The following table summarizes the amortized cost of debt securities held-to-maturity at the dates indicated, aggregated by credit quality indicator: March 31, 2021 December 31, 2020 AAA/AA/A BBB/BB/B AAA/AA/A BBB/BB/B (In thousands) (In thousands) Debt Securities Held to Maturity Obligations of U.S. government agencies $ 250,178 $ — $ 273,667 $ — Obligations of states and political subdivisions 10,276 — 10,896 — Total debt securities held to maturity $ 260,454 $ — $ 284,563 $ —

Loans

Loans	3 Months Ended
Loans	Mar. 31, 2021
Receivables [Abstract]
Loans	Loans A summary of loan balances follows: (in thousands) March 31, 2021 December 31, 2020 Commercial real estate: CRE non-owner occupied $ 1,554,927 $ 1,535,555 CRE owner occupied 641,216 624,375 Multifamily 764,884 639,480 Farmland 147,597 152,492 Total commercial real estate loans 3,108,624 2,951,902 Consumer: SFR 1-4 1st DT liens 636,824 546,592 SFR HELOCs and junior liens 331,333 327,484 Other 73,056 78,032 Total consumer loans 1,041,213 952,108 Commercial and industrial 551,077 526,327 Construction 221,613 284,842 Agriculture production 39,753 44,164 Leases 4,697 3,784 Total loans, net of deferred loan fees and discounts $ 4,966,977 $ 4,763,127 Total principal balance of loans owed, net of charge-offs $ 5,009,686 $ 4,805,596 Unamortized net deferred loan fees (20,108) (16,984) Discounts to principal balance of loans owed, net of charge-offs (22,601) (25,485) Total loans, net of unamortized deferred loan fees and discounts $ 4,966,977 $ 4,763,127 Allowance for credit losses on loans $ (85,941) $ (91,847) As of March 31, 2021 and December 31, 2021, the total balance outstanding of PPP loans, which are included in commercial and industrial loans, was $370,274,000 (approximately 2,484 loans) and $333,982,000 (approximately 2,300 loans), respectively, as compared to total PPP originations of $614,826,000. Included in the balance of outstanding PPP loans as of March 31, 2021 are approximately 1,303 loans with outstanding balances of less than $50,000 each and with a total balance outstanding of $26,895,000. In connection with the origination of the PPP loans, the Company earned $23,585,000 in loan fees, offset by deferred loan costs of $1,163,000, the net of which will be recognized over the earlier of loan maturity, repayment or receipt of forgiveness confirmation. As of March 31, 2021 and December 31, 2020, there was $9,430,000 and $7,212,000, respectively, in net deferred fee income remaining to be recognized. During the three months ended March 31, 2021 and 2020, the Company recognized $5,232,000 and zero, respectively, in fees on PPP loans.

Allowance for Credit Losses

Allowance for Credit Losses	3 Months Ended
Allowance for Credit Losses	Mar. 31, 2021
Allowance For Loan And Lease Losses [Abstract]
Allowance for Credit Losses	Allowance for Credit Losses For the periods indicated, the following tables summarize the activity in the allowance for credit losses on loans which is recorded as a contra asset, and the reserve for unfunded commitments which is recorded on the balance sheet within other liabilities: Allowance for credit losses – Three months ended March 31, 2021 (in thousands) Beginning Charge-offs Recoveries Provision (benefit) Ending Commercial real estate: CRE non-owner occupied $ 29,380 $ — $ 2 $ (2,948) $ 26,434 CRE owner occupied 10,861 — 1 (988) 9,874 Multifamily 11,472 — — 899 12,371 Farmland 1,980 — — (256) 1,724 Total commercial real estate loans 53,693 — 3 (3,293) 50,403 Consumer: SFR 1-4 1st DT liens 10,117 — 10 538 10,665 SFR HELOCs and junior liens 11,771 — 285 (977) 11,079 Other 3,260 (193) 106 (313) 2,860 Total consumer loans 25,148 (193) 401 (752) 24,604 Commercial and industrial 4,252 (33) 136 109 4,464 Construction 7,540 — — (2,064) 5,476 Agriculture production 1,209 — 20 (241) 988 Leases 5 — — 1 6 Allowance for credit losses on loans 91,847 (226) 560 (6,240) 85,941 Reserve for unfunded commitments 3,400 — — 180 3,580 Total $ 95,247 $ (226) $ 560 $ (6,060) $ 89,521 In determining the allowance for credit losses, accruing loans with similar risk characteristics are generally evaluated collectively. To estimate expected losses the Company generally utilizes historical loss trends and the remaining contractual lives of the loan portfolios to determine estimated credit losses through a reasonable and supportable forecast period. Individual loan credit quality indicators including loan grade and borrower repayment performance have been statistically correlated with historical credit losses and various econometrics, including California unemployment, gross domestic product, and corporate bond yields. Model forecasts may be adjusted for inherent limitations or biases that have been identified through independent validation and back-testing of model performance to actual realized results. The Company utilizes a reasonable and supportable forecast period of approximately eight quarters and obtains the forecast data from publicly available sources. The Company also considers the impact of portfolio concentrations, changes in underwriting practices, imprecision in its economic forecasts, and other risk factors that might influence its loss estimation process. During the quarter ended March 31, 2021, the majority of the change in ACL during the period is primarily attributed to portfolio-wide qualitative indicators related to forecasted changes in the US Unemployment outlook and concentration risk. The aggregate change in these qualitative factors during the three months ended March 31, 2021 were $5,435,000. Further, quantitative calculations decreases based on historical loss experience further reduced required credit reserves by $471,000 as of March 31, 2021. Management noted that the majority of economic forecasts utilized in the ACL calculation have recent estimates that forecast the U.S. economy rebounding to pre-pandemic levels during 2021. These forecasts remain cautious as a result of; lingering supply chain interruptions caused by an imbalance in supply and demand, logistical and transportation issues, and resurgences in COVID variants in certain nations worldwide. Management believes that the allowance for credit losses at March 31, 2021 appropriately reflected expected credit losses inherent in the loan portfolio at that date. Allowance for credit losses – Year ended December 31, 2020 (in thousands) Beginning Adoption of CECL Charge-offs Recoveries Provision Ending Balance Commercial real estate: CRE non-owner occupied $ 5,948 $ 6,701 $ — $ 198 $ 16,533 $ 29,380 CRE owner occupied 2,027 2,281 — 28 6,525 10,861 Multifamily 3,352 2,281 — — 5,839 11,472 Farmland 668 585 (182) — 909 1,980 Total commercial real estate loans 11,995 11,848 (182) 226 29,806 53,693 Consumer: SFR 1-4 1st DT liens 2,306 2,675 (13) 416 4,733 10,117 SFR HELOCs and junior liens 6,183 4,638 (116) 304 762 11,771 Other 1,595 971 (670) 347 1,017 3,260 Total consumer loans 10,084 8,284 (799) 1,067 6,512 25,148 Commercial and industrial 4,867 (1,961) (774) 568 1,552 4,252 Construction 3,388 933 — — 3,219 7,540 Agriculture production 261 (179) — 24 1,103 1,209 Leases 21 (12) — — (4) 5 Allowance for credit losses on loans 30,616 18,913 (1,755) 1,885 42,188 91,847 Reserve for unfunded commitments 2,775 — — — 625 3,400 Total $ 33,391 $ 18,913 $ (1,755) $ 1,885 $ 42,813 $ 95,247 On January 1, 2020, the Company adopted ASU 2016-03 Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , which replaces the incurred loss methodology that is referred to as the current expected credit loss (CECL) methodology. The Company recognized an increase in the ACL for loans totaling $18,913,000, including a reclassification of $481,000 from discounts on acquired loans to the allowance for credit losses, as a cumulative effect adjustment from change in accounting policies, with a corresponding decrease in retained earnings, net of $5,449,000 in taxes of $12,983,000. Allowance for loan losses – Three months ended March 31, 2020 (in thousands) Beginning Adoption of CECL Charge-offs Recoveries Provision Ending Balance Commercial real estate: CRE non-owner occupied $ 5,948 $ 6,701 $ — $ 189 $ 5,195 $ 18,033 CRE owner occupied 2,027 2,281 — 5 1,052 5,365 Multifamily 3,352 2,281 — — (493) 5,140 Farmland 668 585 — — (541) 712 Total commercial real estate loans 11,995 11,848 — 194 5,213 29,250 Consumer: SFR 1-4 1st DT liens 2,306 2,675 — 410 259 5,650 SFR HELOCs and junior liens 6,183 4,638 — 48 327 11,196 Other 1,595 971 (130) 94 216 2,746 Total consumer loans 10,084 8,284 (130) 552 802 19,592 Commercial and industrial 4,867 (1,961) (380) 126 1,216 3,868 Construction 3,388 933 — — 274 4,595 Agriculture production 261 (179) — 20 493 595 Leases 21 (12) — — 2 11 Allowance for credit losses on loans 30,616 18,913 (510) 892 8,000 57,911 Reserve for unfunded commitments 2,775 — — — — 2,775 Total $ 33,391 $ 18,913 $ (510) $ 892 $ 8,000 $ 60,686 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 analyzes loans individually to classify the loans as to credit risk and grading. This analysis is performed annually for all outstanding balances greater than $1,000,000 and non-homogeneous loans, such as commercial real estate loans, unless other indicators, such as delinquency, trigger more frequent evaluation. Loans below the $1,000,000 threshold and homogenous in nature are evaluated as needed for proper grading based on delinquency and borrower credit scores. 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. Based on the most recent analysis performed, the risk category of loans by class of loans is as follows for the period indicated: Term Loans Amortized Cost Basis by Origination Year – As of March 31, 2021 (in thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: CRE non-owner occupied risk ratings Pass $ 58,047 $ 130,667 $ 205,818 $ 147,766 $ 252,414 $ 620,082 $ 65,028 $ — $ 1,479,822 Special Mention — — 6,226 11,683 12,245 19,053 12,001 — 61,208 Substandard — — — 1,432 577 11,888 — — 13,897 Doubtful/Loss — — — — — — — — — Total CRE non-owner occupied risk ratings $ 58,047 $ 130,667 $ 212,044 $ 160,881 $ 265,236 $ 651,023 $ 77,029 $ — $ 1,554,927 Term Loans Amortized Cost Basis by Origination Year – As of March 31, 2021 (in thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: CRE owner occupied risk ratings Pass $ 36,465 $ 104,653 $ 73,669 $ 52,367 $ 57,770 $ 270,655 $ 22,402 $ — $ 617,981 Special Mention — — — 288 7,171 8,916 — — 16,375 Substandard — — 1,505 1,282 470 3,603 — — 6,860 Doubtful/Loss — — — — — — — — — Total CRE owner occupied risk ratings $ 36,465 $ 104,653 $ 75,174 $ 53,937 $ 65,411 $ 283,174 $ 22,402 $ — $ 641,216 Commercial real estate: Multifamily risk ratings Pass $ 121,003 $ 82,738 $ 118,173 $ 118,297 $ 68,886 $ 187,843 $ 20,771 $ — $ 717,711 Special Mention — 9,383 — — — 24,679 8,759 — 42,821 Substandard — — 4,352 — — — — — 4,352 Doubtful/Loss — — — — — — — — — Total multifamily loans $ 121,003 $ 92,121 $ 122,525 $ 118,297 $ 68,886 $ 212,522 $ 29,530 $ — $ 764,884 Commercial real estate: Farmland risk ratings Pass $ 4,669 $ 18,083 $ 22,496 $ 18,659 $ 8,467 $ 23,026 $ 38,076 $ — $ 133,476 Special Mention — — — — 1,196 3,316 1,653 — 6,165 Substandard — — 3,266 — 596 1,144 2,950 — 7,956 Doubtful/Loss — — — — — — — — — Total farmland loans $ 4,669 $ 18,083 $ 25,762 $ 18,659 $ 10,259 $ 27,486 $ 42,679 $ — $ 147,597 Consumer loans: SFR 1-4 1st DT liens risk ratings Pass $ 125,704 $ 186,594 $ 72,632 $ 33,274 $ 47,410 $ 152,614 $ — $ 5,039 $ 623,267 Special Mention — — 289 682 421 2,803 — 1,073 5,268 Substandard — — — 1,151 680 6,096 — 362 8,289 Doubtful/Loss — — — — — — — — — Total SFR 1st DT liens $ 125,704 $ 186,594 $ 72,921 $ 35,107 $ 48,511 $ 161,513 $ — $ 6,474 $ 636,824 Consumer loans: SFR HELOCs and Junior Liens Pass $ 700 $ 85 $ — $ 12 $ 343 $ 958 $ 303,290 $ 12,920 $ 318,308 Special Mention — — — 16 — 139 4,254 785 5,194 Substandard — — — — — 33 6,146 1,652 7,831 Doubtful/Loss — — — — — — — — — Total SFR HELOCs and Junior Liens $ 700 $ 85 $ — $ 28 $ 343 $ 1,130 $ 313,690 $ 15,357 $ 331,333 Term Loans Amortized Cost Basis by Origination Year – As of March 31, 2021 (in thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Consumer loans: Other risk ratings Pass $ 5,880 $ 21,727 $ 26,153 $ 12,095 $ 3,472 $ 1,632 $ 889 $ — $ 71,848 Special Mention — 55 202 249 36 78 77 — 697 Substandard — 57 79 134 85 147 9 — 511 Doubtful/Loss — — — — — — — — — Total other consumer loans $ 5,880 $ 21,839 $ 26,434 $ 12,478 $ 3,593 $ 1,857 $ 975 $ — $ 73,056 Commercial and industrial loans: Commercial and industrial risk ratings Pass $ 177,482 $ 216,547 $ 44,666 $ 17,226 $ 11,974 $ 12,802 $ 61,969 $ 964 $ 543,630 Special Mention — — 96 602 169 176 2,558 10 3,611 Substandard — — 282 104 1,375 812 1,188 75 3,836 Doubtful/Loss — — — — — — — — — Total commercial and industrial loans $ 177,482 $ 216,547 $ 45,044 $ 17,932 $ 13,518 $ 13,790 $ 65,715 $ 1,049 $ 551,077 Construction loans: Construction risk ratings Pass $ 1,711 $ 76,063 $ 44,589 $ 37,820 $ 31,303 $ 23,442 $ — $ — $ 214,928 Special Mention — — — — 346 1,756 — — 2,102 Substandard — — — — — 4,583 — — 4,583 Doubtful/Loss — — — — — — — — — Total construction loans $ 1,711 $ 76,063 $ 44,589 $ 37,820 $ 31,649 $ 29,781 $ — $ — $ 221,613 Agriculture production loans: Agriculture production risk ratings Pass $ 262 $ 897 $ 1,959 $ 1,288 $ 1,582 $ 1,108 $ 32,416 $ — $ 39,512 Special Mention — — — 189 — 47 — — 236 Substandard — — — — — 5 — — 5 Doubtful/Loss — — — — — — — — — Total agriculture production loans $ 262 $ 897 $ 1,959 $ 1,477 $ 1,582 $ 1,160 $ 32,416 $ — $ 39,753 Leases: Lease risk ratings Pass $ 4,697 $ — $ — $ — $ — $ — $ — $ — $4,697 Special Mention — — — — — — — — — Substandard — — — — — — — — — Doubtful/Loss — — — — — — — — — Total leases $ 4,697 $ — $ — $ — $ — $ — $ — $ — $ 4,697 Term Loans Amortized Cost Basis by Origination Year – As of March 31, 2021 (in thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Total loans outstanding: Risk ratings Pass $ 536,620 $ 838,054 $ 610,155 $ 438,804 $ 483,621 $ 1,294,162 $ 544,841 $ 18,923 $ 4,765,180 Special Mention — 9,438 6,813 13,709 21,584 60,963 29,302 1,868 143,677 Substandard — 57 9,484 4,103 3,783 28,311 10,293 2,089 58,120 Doubtful/Loss — — — — — — — — — Total loans outstanding $ 536,620 $ 847,549 $ 626,452 $ 456,616 $ 508,988 $ 1,383,436 $ 584,436 $ 22,880 $ 4,966,977 Term Loans Amortized Cost Basis by Origination Year – As of December 31, 2020 (in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: CRE non-owner occupied risk ratings Pass $ 120,520 $ 207,899 $ 155,730 $ 256,677 $ 179,523 $ 460,644 $ 76,730 $ — $ 1,457,723 Special Mention — 7,455 11,692 5,407 15,773 18,832 12,205 — 71,364 Substandard — — 1,449 584 2,147 2,288 — — 6,468 Doubtful/Loss — — — — — — — — — Total CRE non-owner occupied risk ratings $ 120,520 $ 215,354 $ 168,871 $ 262,668 $ 197,443 $ 481,764 $ 88,935 $ — $ 1,535,555 Commercial real estate: CRE owner occupied risk ratings Pass $ 105,896 $ 75,144 $ 53,816 $ 58,371 $ 54,541 $ 227,828 $ 25,508 $ — $ 601,104 Special Mention — — 288 7,451 2,955 6,140 — — 16,834 Substandard — 1,533 1,301 475 1,306 1,822 — — 6,437 Doubtful/Loss — — — — — — — — — Total CRE owner occupied risk ratings $ 105,896 $ 76,677 $ 55,405 $ 66,297 $ 58,802 $ 235,790 $ 25,508 $ — $ 624,375 Commercial real estate: Multifamily risk ratings Pass $ 77,646 $ 118,725 $ 113,882 $ 70,112 $ 67,457 $ 123,518 $ 19,007 $ — $ 590,347 Special Mention 9,441 — — 603 24,687 772 9,259 — 44,762 Substandard — 4,371 — — — — — — — 4,371 Doubtful/Loss — — — — — — — — — Total multifamily loans $ 87,087 $ 123,096 $ 113,882 $ 70,715 $ 92,144 $ 124,290 $ 28,266 $ — $ 639,480 Term Loans Amortized Cost Basis by Origination Year – As of December 31, 2020 (in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: Farmland risk ratings Pass $ 17,640 $ 25,003 $ 19,148 $ 12,834 $ 7,377 $ 17,129 $ 39,411 $ — $ 138,542 Special Mention — 2,567 — 1,271 227 3,107 2,258 — 9,430 Substandard — 700 — 602 — 1,214 2,004 — 4,520 Doubtful/Loss — — — — — — — — — Total farmland loans $ 17,640 $ 28,270 $ 19,148 $ 14,707 $ 7,604 $ 21,450 $ 43,673 $ — $ 152,492 Consumer loans: SFR 1-4 1st DT liens risk ratings Pass $ 183,719 $ 80,717 $ 36,342 $ 53,001 $ 46,467 $ 126,465 $ 76 $ 5,507 $ 532,294 Special Mention — 290 684 110 15 2,936 — 934 4,969 Substandard — — 1,174 929 935 5,763 — 528 9,329 Doubtful/Loss — — — — — — — — — Total SFR 1st DT liens $ 183,719 $ 81,007 $ 38,200 $ 54,040 $ 47,417 $ 135,164 $ 76 $ 6,969 $ 546,592 Consumer loans: SFR HELOCs and Junior Liens Pass $ 793 $ — $ 13 $ 360 $ 300 $ 910 $ 297,160 $ 14,051 $ 313,587 Special Mention — — 16 — — 83 4,504 789 5,392 Substandard — — — — — 39 6,698 1,768 8,505 Doubtful/Loss — — — — — — — — — Total SFR HELOCs and Junior Liens $ 793 $ — $ 29 $ 360 $ 300 $ 1,032 $ 308,362 $ 16,608 $ 327,484 Consumer loans: Other risk ratings Pass $ 25,876 $ 29,539 $ 14,170 $ 4,238 $ 1,020 $ 967 $ 986 $ — $ 76,796 Special Mention 43 208 147 74 24 65 90 — 651 Substandard 58 82 210 74 12 140 9 — 585 Doubtful/Loss — — — — — — — — — Total other consumer loans $ 25,977 $ 29,829 $ 14,527 $ 4,386 $ 1,056 $ 1,172 $ 1,085 $ — $ 78,032 Commercial and industrial loans: Commercial and industrial risk ratings Pass $ 356,701 $ 48,838 $ 20,463 $ 13,151 $ 5,185 $ 9,490 $ 65,938 $ 1,085 $ 520,851 Special Mention — 102 698 195 20 178 207 11 1,411 Substandard — 301 53 1,142 823 148 1,519 79 4,065 Doubtful/Loss — — — — — — — — — Total commercial and industrial loans $ 356,701 $ 49,241 $ 21,214 $ 14,488 $ 6,028 $ 9,816 $ 67,664 $ 1,175 $ 526,327 Term Loans Amortized Cost Basis by Origination Year – As of December 31, 2020 (in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Construction loans: Construction risk ratings Pass 69,133 41,786 92,191 51,082 20,868 2,876 — $ — $ 277,936 Special Mention — — — 346 — 1,780 — — 2,126 Substandard — — — — 4,529 251 — — 4,780 Doubtful/Loss — — — — — — — — — Total construction loans $ 69,133 $ 41,786 $ 92,191 $ 51,428 $ 25,397 $ 4,907 $ — $ — $ 284,842 Agriculture production loans: Agriculture production risk ratings Pass $ 977 $ 2,079 $ 1,590 $ 1,838 $ 663 $ 708 $ 36,051 $ — $ 43,906 Special Mention — — 203 — 49 — — — 252 Substandard — — — — 6 — — — 6 Doubtful/Loss — — — — — — — — — Total agriculture production loans $ 977 $ 2,079 $ 1,793 $ 1,838 $ 718 $ 708 $ 36,051 $ — $ 44,164 Leases: Lease risk ratings Pass $ 3,784 $ — $ — $ — $ — $ — $ — $ — $ 3,784 Special Mention — — — — — — — — — Substandard — — — — — — — — — Doubtful/Loss — — — — — — — — — Total leases $ 3,784 $ — $ — $ — $ — $ — $ — $ — $ 3,784 Total loans outstanding: Risk ratings Pass $ 962,685 $ 629,730 $ 507,345 $ 521,664 $ 383,401 $ 970,535 $ 560,867 $ 20,643 $ 4,556,870 Special Mention 9,484 10,622 13,728 15,457 43,750 33,893 28,523 1,734 157,191 Substandard 58 6,987 4,187 3,806 9,758 11,665 10,230 2,375 49,066 Doubtful/Loss — — — — — — — — — Total loans outstanding $ 972,227 $ 647,339 $ 525,260 $ 540,927 $ 436,909 $ 1,016,093 $ 599,620 $ 24,752 $ 4,763,127 The following table shows the ending balance of current and past due originated loans by loan category as of the date indicated: Analysis of Past Due Loans - As of March 31, 2021 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total Commercial real estate: CRE non-owner occupied $ 55 $ 354 $ 4,110 $ 4,519 $ 1,550,408 $ 1,554,927 CRE owner occupied 158 — 589 747 640,469 641,216 Multifamily — — — — 764,884 764,884 Farmland — — 847 847 146,750 147,597 Total commercial real estate loans 213 354 5,546 6,113 3,102,511 3,108,624 Consumer: SFR 1-4 1st DT liens — — 881 881 635,943 636,824 SFR HELOCs and junior liens 59 490 1,472 2,021 329,312 331,333 Other 66 13 31 110 72,946 73,056 Total consumer loans 125 503 2,384 3,012 1,038,201 1,041,213 Commercial and industrial 152 168 771 1,091 549,986 551,077 Construction 295 — — 295 221,318 221,613 Agriculture production 39 — — 39 39,714 39,753 Leases — — — — 4,697 4,697 Total $ 824 $ 1,025 $ 8,701 $ 10,550 $ 4,956,427 $ 4,966,977 Analysis of Past Due Loans - As of December 31, 2020 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total Commercial real estate: CRE non-owner occupied $ 127 $ 173 $ 239 $ 539 $ 1,535,016 $ 1,535,555 CRE owner occupied 297 824 1,121 623,254 624,375 Multifamily — — — — 639,480 639,480 Farmland 899 — 70 969 151,523 152,492 Total commercial real estate loans 1,323 173 1,133 2,629 2,949,273 2,951,902 Consumer: SFR 1-4 1st DT liens 37 — 960 997 545,595 546,592 SFR HELOCs and junior liens 418 212 1,671 2,301 325,183 327,484 Other 41 13 100 154 77,878 78,032 Total consumer loans 496 225 2,731 3,452 948,656 952,108 Commercial and industrial 155 426 105 686 525,641 526,327 Construction — — — — 284,842 284,842 Agriculture production — — — — 44,164 44,164 Leases — — — — 3,784 3,784 Total $ 1,974 $ 824 $ 3,969 $ 6,767 $ 4,756,360 $ 4,763,127 The following table shows the ending balance of non accrual loans by loan category as of the date indicated: Non Accrual Loans As of March 31, 2021 As of December 31, 2020 (in thousands) Non accrual with no allowance for credit losses Total non accrual Past due 90 days or more and still accruing Non accrual with no allowance for credit losses Total non accrual Past due 90 days or more and still accruing Commercial real estate: CRE non-owner occupied $ 7,000 $ 7,000 $ — $ 3,110 $ 3,110 $ — CRE owner occupied 2,833 3,762 — 3,111 4,061 — Multifamily — — — — — — Farmland 1,431 1,431 — 1,468 1,538 — Total commercial real estate loans 11,264 12,193 — 7,689 8,709 — Consumer: SFR 1-4 1st DT liens 4,853 4,996 — 4,950 5,093 — SFR HELOCs and junior liens 4,187 5,142 — 4,480 6,148 — Other 52 103 — 68 167 — Total consumer loans 9,092 10,241 — 9,498 11,408 — Commercial and industrial 108 1,774 245 652 2,183 — Construction 4,483 4,483 — 4,546 4,546 — Agriculture production 5 5 — 5 18 — Leases — — — — — — Sub-total 24,952 28,696 245 22,390 26,864 — Less: Guaranteed loans (814) (814) — (687) (811) Total, net $ 24,138 $ 27,882 $ 245 $ 21,703 $ 26,053 $ — Interest income on non accrual loans that would have been recognized during the three months ended March 31, 2021 and 2020, if all such loans had been current in accordance with their original terms, totaled $536,000 and $431,000, respectively. Interest income actually recognized on these originated loans during the three months ended March 31, 2021 and 2020 was $17,000 and $47,000, respectively. The following tables present the amortized cost basis of collateral dependent loans by class of loans as of the following periods: As of March 31, 2021 (in thousands) Retail Office Warehouse Other Multifamily Farmland SFR -1st Deed SFR -2nd Deed Automobile/Truck A/R and Inventory Equipment Total Commercial real estate: CRE non-owner occupied $ 2,630 $ 427 $ — $ 3,943 $ — $ — $ — $ — $ — $ — $ — $ 7,000 CRE owner occupied 781 927 1,640 414 — — — — — — — 3,762 Multifamily — — — — — — — — — — — — Farmland — — — — — 1,431 — — — — — 1,431 Total commercial real estate loans 3,411 1,354 1,640 4,357 — 1,431 — — — — — 12,193 Consumer: SFR 1-4 1st DT liens — — — — — — 4,996 — — — — 4,996 SFR HELOCs and junior liens — — — — — — 1,882 2,471 — — — 4,353 Other — — — 69 — — — — 25 — — 94 Total consumer loans — — — 69 — — 6,878 2,471 25 — — 9,443 Commercial and industrial — — — 272 — — — — — 1,288 214 1,774 Construction — — — — — — 4,483 — — — — 4,483 Agriculture production — — — — — — — — — — 5 5 Leases — — — — — — — — — — — — Total $ 3,411 $ 1,354 $ 1,640 $ 4,698 $ — $ 1,431 $ 11,361 $ 2,471 $ 25 $ 1,288 $ 219 $ 27,898 As of December 31, 2020 (in thousands) Retail Office Warehouse Other Multifamily Farmland SFR -1st Deed SFR -2nd Deed Automobile/Truck A/R and Inventory Equipment Total Commercial real estate: CRE non-owner occupied $ 2,445 $ 435 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ 2,880 CRE owner occupied 796 1,176 1,668 — — — — — — — — 3,640 Multifamily — — — — — — — — — — — — Farmland — — — — — — 1,538 — — — — — 1,538 Total commercial real estate loans 3,241 1,611 1,668 — — 1,538 — — — — — 8,058 Consumer: SFR 1-4 1st DT liens — — — — — — 5,068 — — — — 5,068 SFR HELOCs and junior liens — — — — — — 1,855 2,839 — — — 4,694 Other — — — 42 — — — — 97 — — 139 Total consumer loans — — — 42 — — 6,923 2,839 97 — — 9,901 Commercial and industrial — — — 292 — — — — — 1,173 75 1,540 Construction — — — — — — 4,547 — — — — 4,547 Agriculture production — — — — — — — — — 13 5 18 Leases — — — — — — — — — — — — Total $ 3,241 $ 1,611 $ 1,668 $ 334 $ — $ 1,538 $ 11,470 $ 2,839 $ 97 $ 1,186 $ 80 $ 24,064 TDR information for the three months ended March 31, 2021 (dollars in thousands) Number Pre-mod Post-mod Financial Number that Recorded Financial impact Commercial real estate: CRE non-owner occupied 1 $ 317 $ 314 $ 314 — $ — $ — CRE owner occupied 1 740 742 742 — — — Multifamily — — — — — — — Farmland — — — — 3 847 — Total commercial real estate loans 2 1,057 1,056 1,056 3 847 — Consumer: SFR 1-4 1st DT liens — — — — — — — SFR HELOCs and junior liens — — — — — — — Other — — — — — — — Total consumer loans — — — — — — — Commercial and industrial 3 316 310 310 1 247 — Construction — — — — — — — Agriculture production — — — — — — — Leases — — — — — — — Total 5 $ 1,373 $ 1,366 $ 1,366 4 $ 1,094 $ — TDR information for the three months ended March 31, 2020 (dollars in thousands) Number Pre-mod Post-mod Financial Number that Recorded Financial impact Commercial real estate: CRE non-owner occupied 1 $ 257 $ 251 $ — — $ — $ — CRE owner occupied — — — — — — — Multifamily — — — — — — — Farmland 2 230 298 — — — — Total commercial real estate loans 3 487 549 — — — — Consumer: SFR 1-4 1st DT liens — — — — 1 302 — SFR HELOCs and junior liens 2 172 169 — — — — Other — — — — — — — Total consumer loans 2 172 169 — 1 302 — Commercial and industrial 1 21 20 21 — — — Construction — — — — — — — Agriculture production — — — — — — — Leases — — — — — — — Total 6 $ 680 $ 738 $ 21 1 $ 302 $ — The Company also modified the terms of select loans in an effort to assist borrowers that were not related to the COVID-19 pandemic. If the borrower was experiencing financial difficulty and a concession was granted, the Company considered such modifications as troubled debt restructurings. 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. The objective of the modifications was to increase loan repayments by customers and thereby reduce net charge-offs. The modified loans are included in impaired loans for purposes of determining the level of the allowance for credit losses. 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. Loans that defaulted within the twelve month period subsequent to modification were not considered significant for financial reporting purposes.

Leases

Leases	3 Months Ended
Leases	Mar. 31, 2021
Leases [Abstract]
Leases	Leases The Company records 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 also records a lease liability on the consolidated balance sheets for the present value of future payment commitments. 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 12 month 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. Topic 842 requires the use of 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 amount of lease liability and adjusted for prepaid or accrued lease payments, remaining lease incentives, unamortized direct costs (if any), and impairment (if any). The following table presents the components of lease expense for the periods ended: Three months ended March 31, (in thousands) 2021 2020 Operating lease cost $ 1,258 $ 1,294 Short-term lease cost 61 63 Variable lease cost (2) 6 Sublease income (13) (34) Total lease cost $ 1,304 $ 1,329 The following table presents supplemental cash flow information related to leases for the periods ended: Three months ended March 31, (in thousands) 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 1,204 $ 1,237 ROUA obtained in exchange for operating lease liabilities $ 1,308 $ 3,393 The following table presents the weighted average operating lease term and discount rate as of the period ended: March 31, 2021 2020 Weighted-average remaining lease term (years) 9.8 10.3 Weighted-average discount rate 3.03 % 3.17 % At March 31, 2021, future expected operating lease payments are as follows: (in thousands) Periods ending December 31, 2021 $ 3,505 2022 4,320 2023 3,649 2024 3,377 2025 2,916 Thereafter 14,933 32,700 Discount for present value of expected cash flows (4,920) Lease liability at March 31, 2021 $ 27,780

Deposits

Deposits	3 Months Ended
Deposits	Mar. 31, 2021
Deposits [Abstract]
Deposits	Deposits A summary of the balances of deposits follows (in thousands): March 31, December 31, Noninterest-bearing demand $ 2,766,510 $ 2,581,517 Interest-bearing demand 1,465,915 1,414,908 Savings 2,302,927 2,164,942 Time certificates, $250,000 or more 64,509 73,147 Other time certificates 263,539 271,420 Total deposits $ 6,863,400 $ 6,505,934 Certificate of deposit balances of $10,000,000 from the State of California were included in time certificates, over $250,000, at March 31, 2021 and December 31, 2020, respectively. The Company participates in a deposit program offered by the State of California whereby the State may make deposits at the Company’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 Company. Overdrawn deposit balances of $813,000 and $985,000 were classified as consumer loans at March 31, 2021 and December 31, 2020, respectively.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and ContingenciesThe following table presents a summary of the Bank’s commitments and contingent liabilities: (in thousands) March 31, December 31, Financial instruments whose amounts represent risk: Commitments to extend credit: Commercial loans $ 473,971 $ 462,422 Consumer loans 539,670 534,223 Real estate mortgage loans 231,509 202,306 Real estate construction loans 231,697 227,876 Standby letters of credit 14,543 15,056 Deposit account overdraft privilege 122,965 110,813

Shareholders' Equity

Shareholders' Equity	3 Months Ended
Shareholders' Equity	Mar. 31, 2021
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Dividends Paid The Bank paid to the Company cash dividends in the aggregate amounts of $7,772,000 and $26,754,000 during the three months ended March 31, 2021 and 2020, respectively. The Bank is regulated by the Federal Deposit Insurance Corporation (FDIC) and the State of California Department of Business Oversight (DBO). Absent approval from the Commissioner of the DBO, 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. Stock Repurchase Plan On February 25, 2021 the Board of Directors approved the authorization to repurchase up to 2,000,000 shares of the Company's common stock (the 2021 Repurchase Plan), which approximated 6.7% 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 2021 Repurchase Plan has no expiration date and the Company has had no share repurchases during the quarter ended March 31, 2021. In connection with approval of the 2021 Repurchase Plan, the Company’s previous repurchase program adopted on November 12, 2019 (the 2019 Repurchase Plan) was terminated. Under the 2019 Repurchase Plan, during the three months ended March 31, 2021, the Company repurchased 223 shares with a market value of approximately $8,260. The Company repurchased 858,717 shares during 2020. 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 exercise price, if applicable, and the tax withholding on such shares. During the three months ended March 31, 2021 and 2020, employees tendered zero and 4,668 shares, respectively, of the Company’s common stock in connection with option exercises. Employees also tendered 70 and 133 shares in connection with the tax withholding requirements of other share based awards during the three months ended March 31, 2021 and 2020, respectively. In total, shares of the Company's common stock tendered had market values of $2,500 and $153,000 during the quarter ended March 31, 2021 and 2020, 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 2021 or 2019 Stock Repurchase Plans.

Stock Options and Other Equity-

Stock Options and Other Equity-Based Incentive Instruments	3 Months Ended
Stock Options and Other Equity-Based Incentive Instruments	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock Options and Other Equity-Based Incentive Instruments	Stock Options and Other Equity-Based Incentive InstrumentsOn April 16, 2019, the Board of Directors adopted the 2019 Equity Incentive Plan (2019 Plan) which was approved by shareholders on May 21, 2019. The 2019 Plan allows for up to 1,500,000 shares to be issued in connection with equity-based incentives. The Company’s 2009 Equity Incentive Plan (2009 Plan) expired on March 26, 2019. While no new awards can be granted under the 2009 Plan, existing grants continue to be governed by the terms, conditions and procedures set forth in any applicable award agreement. Stock option activity during the three months ended March 31, 2021 is summarized in the following table: Number Option Price Weighted Outstanding at December 31, 2020 128,500 $14.54 to $23.21 $ 17.72 Options granted — — — Options exercised — $— to $— — Options forfeited — — — Outstanding at March 31, 2021 128,500 $14.54 to $23.21 $ 17.72 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 March 31, 2021: Currently Currently Not Total Number of options 128,500 — 128,500 Weighted average exercise price $ 17.72 $ — $ 17.72 Intrinsic value (in thousands) $ 3,810 $ — $ 3,810 Weighted average remaining contractual term (yrs.) 1.7 n/a 1.7 As of March 31, 2021 all options outstanding are fully vested and are expected to be exercised prior to expiration. The Company did not modify any option grants during 2020 or the three months ended March 31, 2021. Activity related to restricted stock unit awards during the three months ended March 31, 2021 is summarized in the following table: Service Market Plus Outstanding at December 31, 2020 99,809 81,615 RSUs granted — — RSUs added through dividend and performance credits 504 — RSUs released (201) — RSUs forfeited/expired (55) — Outstanding at March 31, 2021 100,057 81,615 During the three months ended March 30, 2021 and 2020 there were no restricted stock unit awards granted under the 2019 Plan. The 100,057 of service condition vesting RSUs outstanding as of March 31, 2021 include a feature whereby each RSU outstanding is credited with a dividend amount equal to any common stock cash dividend declared and paid, and the credited amount is divided by the closing price of the Company’s stock on the dividend payable date to arrive at an additional amount of RSUs outstanding under the original grant. The dividend credits follow the same vesting requirements as the RSU awards and are not considered participating securities. The 100,057 of service condition vesting RSUs outstanding as of March 31, 2021 are expected to vest, and be released, on a weighted-average basis, over the next 1.2 years. The Company expects to recognize $2,058,000 of pre-tax compensation costs related to these service condition vesting RSUs between March 31, 2021 and their vesting dates. The Company did not modify any service condition vesting RSUs during 2020 or during the three months ended March 31, 2021. The 81,615 of market plus service condition vesting RSUs outstanding as of March 31, 2021 are expected to vest, and be released, on a weighted-average basis, over the next 1.6 years. The Company expects to recognize $1,096,000 of pre-tax compensation costs related to these RSUs between March 31, 2021 and their vesting dates. As of March 31, 2021, 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 122,423 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 2020 or during the three months ended March 31, 2021.

Non-interest Income and Expense

Non-interest Income and Expense	3 Months Ended
Non-interest Income and Expense	Mar. 31, 2021
Other Income and Expenses [Abstract]
Non-interest Income and Expense	Non-interest Income and Expense The following table summarizes the Company’s non-interest income for the periods indicated: Three months ended (dollars in thousands) 2021 2020 ATM and interchange fees $ 5,861 $ 5,111 Service charges on deposit accounts 3,269 4,046 Other service fees 871 758 Mortgage banking service fees 463 469 Change in value of mortgage servicing rights 12 (1,258) Total service charges and fees 10,476 9,126 Increase in cash value of life insurance 673 720 Asset management and commission income 834 916 Gain on sale of loans 3,247 891 Lease brokerage income 110 193 Sale of customer checks 119 124 Gain on sale of investment securities — — (Loss) gain on marketable equity securities (53) 47 Other 704 (197) Total other non-interest income 5,634 2,694 Total non-interest income $ 16,110 $ 11,820 The components of non-interest expense were as follows (in thousands): Three months ended 2021 2020 Base salaries, net of deferred loan origination costs $ 15,511 $ 17,623 Incentive compensation 3,580 3,101 Benefits and other compensation costs 6,239 6,548 Total salaries and benefits expense 25,330 27,272 Occupancy 3,726 3,875 Data processing and software 3,202 3,367 Equipment 1,517 1,512 Intangible amortization 1,431 1,431 Advertising 380 665 ATM and POS network charges 1,246 1,373 Professional fees 594 703 Telecommunications 581 725 Regulatory assessments and insurance 612 95 Postage 198 290 Operational losses 209 221 Courier service 294 331 Gain on sale of foreclosed assets (51) (41) Other miscellaneous expense 2,349 2,930 Total other non-interest expense 16,288 17,477 Total non-interest expense $ 41,618 $ 44,749

Earnings Per Share

Earnings Per Share	3 Months Ended
Earnings Per Share	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share represent income available to common shareholders divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per share reflect additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustments to income that would result from assumed issuance. Potential common shares that may be issued by the Company relate to outstanding stock options and restricted stock units (RSUs), and are determined using the treasury stock method. Earnings per share have been computed based on the following: Three months ended March 31, (in thousands) 2021 2020 Net income $ 33,649 $ 16,121 Average number of common shares outstanding 29,727 30,395 Effect of dilutive stock options and restricted stock 178 128 Average number of common shares outstanding used to calculate diluted earnings per share 29,905 30,523 Options excluded from diluted earnings per share because of their antidilutive effect — —

Comprehensive Income (Loss)

Comprehensive Income (Loss)	3 Months Ended
Comprehensive Income (Loss)	Mar. 31, 2021
Equity [Abstract]
Comprehensive Income (Loss)	Comprehensive Income (Loss) 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 identified as accumulated other comprehensive income (AOCI), such items, along with net income, are components of other comprehensive income (loss) (OCI). The components of other comprehensive income and related tax effects are as follows: Three months ended March 31, (in thousands) 2021 2020 Unrealized holding losses on available for sale securities before reclassifications $ (12,337) $ (29,561) Amounts reclassified out of AOCI: Realized gain on debt securities — — Unrealized holding losses on available for sale securities after reclassifications (12,337) (29,561) Tax effect 3,647 8,739 Unrealized holding losses on available for sale securities, net of tax (8,690) (20,822) Change in unfunded status of the supplemental retirement plans before reclassifications (49) 448 Amounts reclassified out of AOCI: Amortization of prior service cost (14) (14) Amortization of actuarial losses 63 478 Total amounts reclassified out of accumulated other comprehensive income 49 464 Change in unfunded status of the supplemental retirement plans after reclassifications — 912 Tax effect — — Change in unfunded status of the supplemental retirement plans, net of tax — 912 Change in joint beneficiary agreement liability before reclassifications (629) — Tax effect — — Change in joint beneficiary agreement liability before reclassifications, net of tax (629) — Total other comprehensive loss $ (9,319) $ (19,910) The components of accumulated other comprehensive income, included in shareholders’ equity, are as follows: (in thousands) March 31, December 31, Net unrealized gain on available for sale securities $ 6,846 $ 19,183 Tax effect (2,024) (5,671) Unrealized holding gain on available for sale securities, net of tax 4,822 13,512 Unfunded status of the supplemental retirement plans (1,294) (1,294) Tax effect 382 382 Unfunded status of the supplemental retirement plans, net of tax (912) (912) Joint beneficiary agreement liability (949) (320) Tax effect — — Joint beneficiary agreement liability, net of tax (949) (320) Accumulated other comprehensive income $ 2,961 $ 12,280

Fair Value Measurement

Fair Value Measurement	3 Months Ended
Fair Value Measurement	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurement	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. Marketable equity securities, debt securities available-for-sale, loans held 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 loans held for investment and certain other assets. These nonrecurring fair value adjustments typically involve application 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. Marketable equity securities and debt securities available for sale - Marketable equity securities and debt 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 recurring fair value adjustments as Level 2. Individually evaluated loans - Loans are not recorded at fair value on a recurring basis. However, from time to time, certain loans have individual risk characteristics not consistent with a pool of loans and is individually evaluated for credit reserves. Loans for which it is probable that payment of interest and principal will not be made in accordance with the original contractual terms of the loan agreement are typically individually evaluated. The fair value of these loans are estimated using one of several methods, including collateral value, fair value of similar debt, enterprise value, liquidation value and discounted cash flows. Those 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. 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 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 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 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. The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis (in thousands): Fair value at March 31, 2021 Total Level 1 Level 2 Level 3 Marketable equity securities $ 2,971 $ 2,971 $ — $ — Debt securities available for sale: Obligations of U.S. government corporations and agencies 1,032,934 — 1,032,934 — Obligations of states and political subdivisions 140,384 — 140,384 — Corporate bonds 2,534 — 2,534 — Asset backed securities 506,253 — 506,253 — Loans held for sale 3,995 — 3,995 — Mortgage servicing rights 5,607 — — 5,607 Total assets measured at fair value $ 1,694,678 $ 2,971 $ 1,686,100 $ 5,607 Fair value at December 31, 2020 Total Level 1 Level 2 Level 3 Marketable equity securities $ 3,025 $ 3,025 $ — $ — Debt securities available for sale: Obligations of U.S. government corporations and agencies 812,374 — 812,374 — Obligations of states and political subdivisions 129,095 — 129,095 — Corporate bonds 2,544 — 2,544 — Asset backed securities 470,251 — 470,251 — Loans held for sale 6,268 — 6,268 — Mortgage servicing rights 5,092 — — 5,092 Total assets measured at fair value $ 1,428,649 $ 3,025 $ 1,420,532 $ 5,092 Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally corresponds with the Company’s quarterly valuation process. There were no transfers between any levels during the three months ended March 31, 2021, or the year ended December 31, 2020. The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the time periods indicated. Had there been any transfer into or out of Level 3 during the time periods indicated, the amount included in the “Transfers into (out of) Level 3” column would represent the beginning balance of an item in the period (interim quarter) during which it was transferred (in thousands): Three months ended March 31, Beginning Transfers Change Issuances Ending 2021: Mortgage servicing rights $ 5,092 — $ 12 $ 503 $ 5,607 2020: Mortgage servicing rights $ 6,200 — $ (1,258) $ 226 $ 5,168 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). The following table presents quantitative information about recurring Level 3 fair value measurements at March 31, 2021 and December 31, 2020: As of March 31, 2021: Fair Value Valuation Unobservable Range, Mortgage Servicing Rights $ 5,607 Discounted cash flow Constant prepayment rate 11% - 24%; 14.2% Discount rate 10% - 14%; 12% As of December 31, 2020: Mortgage Servicing Rights $ 5,092 Discounted cash flow Constant prepayment rate 14% - 20.0%; 17.6% Discount rate 10% - 14%; 12% The tables below present the recorded investment in assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated (in thousands): March 31, 2021 Total Level 1 Level 2 Level 3 Total Gains (Losses) Fair value: Individually evaluated loans $ 4,557 — — $ 4,557 $ (2,710) Foreclosed assets 214 — — 214 (31) Total assets measured at fair value $ 4,771 $ — $ — $ 4,771 $ (2,741) December 31, 2020 Total Level 1 Level 2 Level 3 Total Gains (Losses) Fair value: Individually evaluated loans $ 1,424 — — $ 1,424 $ (1,489) Foreclosed assets 979 — — 979 155 Total assets measured at fair value $ 2,403 — — $ 2,403 $ (1,334) March 31, 2020 Total Level 1 Level 2 Level 3 Total Gains (Losses) Fair value: Individually evaluated loans $ 105 — — $ 105 $ (107) The individually evaluated loan amounts above represent collateral dependent loans that have been adjusted to fair value. When the Company identifies a collateral dependent loan with unique risk characteristics, the Company evaluates the need for an allowance 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 the Company determines that the value of the loan is less than the recorded investment in the loan, the Company recognizes this impairment and adjust the carrying value of the loan to fair value through the allowance for credit 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 Company 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 credit 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 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 March 31, 2021: March 31, 2021 Fair Value Valuation Unobservable Inputs Range, Individually evaluated loans $ 4,557 Sales comparison Adjustment for differences between Not meaningful Foreclosed assets (Residential real estate) $ 214 Sales comparison Adjustment for differences between Not meaningful 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, 2020: December 31, 2020 Fair Value Valuation Unobservable Inputs Range, Individually evaluated loans $ 1,424 Sales comparison Adjustment for differences between Not meaningful Foreclosed assets (Residential real estate) $ 979 Sales comparison Adjustment for differences between Not meaningful Fair values for financial instruments are management’s estimates of the values at which the instruments could be exchanged in a transaction between willing parties. The Company uses the exit price notion when measuring the fair value of financial instruments. These estimates are subjective and may vary significantly from amounts that would be realized in actual transactions. In addition, other significant assets are not considered financial assets including, any mortgage banking operations, deferred tax assets, and premises and equipment. Further, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on the fair value estimates and have not been considered in any of these estimates. March 31, 2021 December 31, 2020 (in thousands) Carrying Fair Carrying Fair Financial assets: Level 1 inputs: Cash and due from banks $ 94,157 $ 94,157 $ 77,253 $ 77,253 Cash at Federal Reserve and other banks 515,365 515,365 592,298 592,298 Level 2 inputs: Securities held to maturity 260,454 271,439 284,563 298,726 Restricted equity securities 17,250 N/A 17,250 N/A Level 3 inputs: Loans, net 4,881,036 4,885,946 4,671,280 4,753,027 Financial liabilities: Level 2 inputs: Deposits 6,863,400 6,870,196 6,505,934 6,507,235 Other borrowings 36,266 36,266 26,914 26,914 Level 3 inputs: Junior subordinated debt 57,742 57,685 57,635 56,632 (in thousands) Contract Fair Contract Fair Off-balance sheet: Level 3 inputs: Commitments $ 1,476,847 $ 14,768 $ 1,426,827 $ 14,268 Standby letters of credit 14,543 145 15,056 151 Overdraft privilege commitments 122,965 1,229 110,813 1,108

Regulatory Matters

Regulatory Matters	3 Months Ended
Regulatory Matters	Mar. 31, 2021
Banking and Thrift [Abstract]
Regulatory Matters	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 1 capital to risk-weighted assets, and of Tier 1 capital to average assets. The following tables present actual and required capital ratios as of March 31, 2021 and December 31, 2020 for the Company and the Bank under applicable Basel III Capital Rules. The minimum capital amounts presented include the minimum required capital levels as of March 31, 2021 and December 31, 2020 based on the then phased-in provisions of the Basel III Capital Rules. Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. Actual Required for Capital Adequacy Purposes Required to be As of March 31, 2021: Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) Total Capital (to Risk Weighted Assets): Consolidated $ 825,099 15.13 % $ 572,425 10.50 % N/A N/A Tri Counties Bank $ 812,092 14.90 % $ 572,229 10.50 % $ 544,980 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 756,668 13.88 % $ 463,392 8.50 % N/A N/A Tri Counties Bank $ 743,705 13.65 % $ 463,233 8.50 % $ 435,984 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 700,660 12.85 % $ 381,617 7.00 % N/A N/A Tri Counties Bank $ 743,705 13.65 % $ 381,486 7.00 % $ 354,237 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 756,668 10.00 % $ 302,730 4.00 % N/A N/A Tri Counties Bank $ 743,705 9.84 % $ 302,385 4.00 % $ 377,981 5.00 % Actual Required for Capital Adequacy Purposes Required to be As of December 31, 2020: Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) Total Capital (to Risk Weighted Assets): Consolidated $ 793,433 15.22 % $ 547,352 10.50 % N/A N/A Tri Counties Bank $ 780,320 14.97 % $ 547,156 10.50 % $ 521,101 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 727,879 13.96 % $ 443,094 8.50 % N/A N/A Tri Counties Bank $ 714,811 13.72 % $ 442,936 8.50 % $ 416,881 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 671,975 12.89 % $ 364,901 7.00 % N/A N/A Tri Counties Bank $ 714,811 13.72 % $ 364,771 7.00 % $ 338,716 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 727,879 9.93 % $ 293,138 4.00 % N/A N/A Tri Counties Bank $ 714,811 9.76 % $ 292,949 4.00 % $ 366,186 5.00 % As of March 31, 2021 and December 31, 2020, capital levels at the Company and the Bank exceed all capital adequacy requirements under the Basel III Capital Rules. Also, at March 31, 2021 and December 31, 2020, the Bank’s capital levels exceeded the minimum amounts necessary to be considered well capitalized under the current regulatory framework for prompt corrective action. The Basel III Capital Rules require for all banking organizations to maintain a capital conservation buffer above the minimum risk-based capital requirements in order to avoid certain limitations on capital distributions, stock repurchases and discretionary bonus payments to executive officers. The capital conservation buffer is exclusively composed of common equity tier 1 capital, and it applies to each of the risk-based capital ratios but not the leverage ratio. At March 31, 2021, the Company and the Bank are in compliance with the capital conservation buffer requirement.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2021
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation TriCo Bancshares (the “Company” or “we”) is a California corporation organized to act as a bank holding company for Tri Counties Bank (the “Bank”). The Company and the Bank are headquartered in Chico, California. The Bank is a California-chartered bank that is engaged in the general commercial banking business in 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 $1,830,000 are accounted for under the equity method and, accordingly, are not consolidated and are included in other assets on the consolidated balance sheet. The subordinated debentures issued and guaranteed by the Company and held by the Capital Trusts are reflected as debt on the Company’s consolidated balance sheet.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (the “2020 Annual Report”). The Company believes that the disclosures made are adequate to make the information not misleading.
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.
Reclassification	Reclassification Some items in the prior year consolidated financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior year net income or shareholders’ equity.
Cash and Cash Equivalents	Cash and Cash Equivalents Net cash flows are reported for loan and deposit transactions and other borrowings. For purposes of the consolidated statement of cash flows, cash, due from banks with original maturities less than 90 days, interest-earning deposits in other banks, and Federal funds sold are considered to be cash equivalents.
Allowance for Credit Losses - Securities	Allowance for Credit Losses - Securities The Company measures expected credit losses on held-to-maturity debt securities on a collective basis by major security type, then further
Loans	Loans Loans that management has the intent and ability to hold until maturity or payoff are reported at principle amount outstanding, net of deferred loan fees and costs. 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 a loan is placed on nonaccrual status, all interest previously accrued but not collected is reversed against interest income. 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. Accrued interest receivable is not included in the calculation of the allowance for credit losses.
Allowance for Credit Losses - Loans	Allowance for Credit Losses - Loans The allowance for credit losses (ACL) is a valuation account that is deducted from the loan's amortized cost basis to present the net amount expected to be collected on the loans. Loans are charged off against the allowance when management believes the recorded loan balance is confirmed as uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. Regardless of the determination that a charge-off is appropriate for financial accounting purposes, the Company manages its loan portfolio by continually monitoring, where possible, a borrower's ability to pay through the collection of financial information, delinquency status, borrower discussion and the encouragement to repay in accordance with the original contract or modified terms, if appropriate. Management estimates the allowance balance using relevant information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. The allowance for credit losses is measured on a collective (pool) basis when similar risk characteristics exist. Historical credit loss experience provides the basis for the estimation of expected credit losses, which captures loan balances as of a point in time to form a cohort, then tracks the respective losses generated by that cohort of loans over the remaining life. The Company identified and accumulated loan cohort historical loss data beginning with the fourth quarter of 2008 and through the current period. In situations where the Company's actual loss history was not statistically relevant, the loss history of peers, defined as financial institutions with assets greater than three billion and less than ten billion, were utilized to create a minimum loss rate. Adjustments to historical loss information are made for differences in relevant current loan-specific risk characteristics, such as historical timing of losses relative to the loan origination. In its loss forecasting framework, the Company incorporates forward-looking information through the use of macroeconomic scenarios applied over the forecasted life of the assets. These macroeconomic scenarios incorporate variables that have historically been key drivers of increases and decreases in credit losses. These variables include, but are not limited to changes in environmental conditions, such as California unemployment rates, household debt levels and U.S. gross domestic product. A loan is considered to be collateral dependent when repayment is expected to be provided substantially through the operation or sale of the collateral. The ACL on collateral dependent loans is measured using the fair value of the underlying collateral, adjusted for costs to sell when applicable, less the amortized cost basis of the financial asset. If the value of underlying collateral is determined to be less than the recorded amount of the loan, a charge-off will be taken. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, is considered to be a troubled debt restructuring (TDR). The ACL on a TDR is measured using the same method as all other portfolio loans, except when the value of a concession cannot be measured using a method other than the discounted cash flow method. When the value of a concession is measured using the discounted cash flow method, the ACL is determined by discounting the expected future cash flows at the original interest rate of the loan. The Company has identified the following portfolio segments to evaluate and measure the allowance for credit loss: Commercial real estate : Commercial real estate - Non-owner occupied: These commercial properties typically consist of buildings which are leased to others for their use and rely on rents as the primary source of repayment. Property types are predominantly office, retail, or light industrial but the portfolio also has some special use properties. As such, the risk of loss associated with these properties is primarily driven by general economic changes or changes in regional economies and the impact of such on a tenant’s ability to pay. Ultimately this can affect occupancy, rental rates, or both. Additional risk of loss can come from new construction resulting in oversupply, the costs to hold or operate the property, or changes in interest rates. The terms on these loans at origination typically have maturities from five fifteen Commercial real estate - Owner occupied: These credits are primarily susceptible to changes in the financial condition of the business operated by the property owner. This may be driven by changes in, among other things, industry challenges, factors unique to the operating geography of the borrower, change in the individual fortunes of the business owner, general economic conditions and changes in business cycles. 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 more by general economic conditions, the underlying collateral may have devalued more and thus result in larger losses in the event of default. The terms on these loans at origination typically have maturities from five fifteen Multifamily: These commercial properties are generally comprised of more than four rentable units, such as apartment buildings, with each unit intended to be occupied as the primary residence for one or more persons. Multifamily properties are also subject to changes in general or regional economic conditions, such as unemployment, ultimately resulting in increased vacancy rates or reduced rents or both. In addition, new construction can create an oversupply condition and market competition resulting in increased vacancy, reduced market rents, or both. Due to the nature of their use and the greater likelihood of tenant turnover, the management of these properties is more intensive and therefore is more critical to the preclusion of loss. Farmland: While the Company has few loans that were originated for the purpose of the acquisition of these commercial properties, loans secured by farmland represent unique risks that are associated with the operation of an agricultural businesses. The valuation of farmland can vary greatly over time based on the property's access to resources including but not limited to water, crop prices, foreign exchange rates, government regulation or restrictions, and the nature of ongoing capital investment needed to maintain the quality of the property. Loans secured by farmland typically represent less risk to the Company than other agriculture loans as the real estate typically provides greater support in the event of default or need for longer term repayment. Consumer loans : SFR 1-4 1st DT Liens: The most significant drivers of potential loss within the Company's residential real estate portfolio relate general, regional, or individual changes in economic conditions and their effect on employment and borrowers cash flow. Risk in this portfolio is best measured by changes in borrower credit score and loan-to-value. Loss estimates are based on the general movement in credit score, economic outlook and its effects on employment and the value of homes and the Bank’s historical loss experience adjusted to reflect the economic outlook and the unemployment rate. SFR HELOCs and Junior Liens: Similar to residential real estate term loans, HELOCs and junior liens performance is also primarily driven by borrower cash flows based on employment status. However, HELOCs carry additional risks associated with the fact that most of these loans are secured by a deed of trust in a position that is junior to the primary lien holder. Furthermore, the risk that as the borrower's financial strength deteriorates, the outstanding balance on these credit lines may increase as they may only be canceled by the Company if certain limited criteria are met. In addition to the allowance for credit losses maintained as a percent of the outstanding loan balance, the Company maintains additional reserves for the unfunded portion of the HELOC. Other: The majority of consumer loans are secured by automobiles, with the remainder primarily unsecured revolving debt (credit cards). These loans 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, if any. 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 those factors. Credit card loans are unsecured and while collection efforts are pursued in the event of default, there is typically limited opportunity for recovery. Loss estimates are based on the general movement in credit score, economic outlook and its effects on employment and the Bank’s historical loss experience adjusted to reflect the economic outlook and the unemployment rate. Commercial and Industrial: Repayment of these loans is primarily based on the cash flow of the borrower, and secondarily on the underlying collateral provided by the borrower. A borrower's cash flow may be unpredictable, and collateral securing these loans may fluctuate in value. Most often, collateral includes accounts receivable, inventory, or equipment. Collateral securing these loans may depreciate over time, may be difficult to appraise, may be illiquid and may fluctuate in value based on the success of the business. Actual and forecast changes in gross domestic product are believed to be corollary to losses associated with these credits. Construction : While secured by real estate, construction loans represent a greater level of risk than term real estate loans due to the nature of the additional risks associated with the not only the completion of construction within an estimated time period and budget, but also the need to either sell the building or reach a level of stabilized occupancy sufficient to generate the cash flows necessary to support debt service and operating costs. The Company seeks to mitigate the additional risks associated with construction lending by requiring borrowers to comply with lower loan to value ratios and additional covenants as well as strong tertiary support of guarantors. The loss forecasting model applies the historical rate of loss for similar loans over the expected life of the asset as adjusted for macroeconomic factors. Agriculture Production: Repayment of agricultural loans is dependent upon successful operation of the agricultural business, which is greatly impacted by factors outside the control of the borrower. These factors include adverse weather conditions, including access to water, that may impact crop yields, loss of livestock due to disease or other factors, declines in market prices for agriculture products, changes in foreign exchange, and the impact of government regulations. In addition, many farms are dependent on a limited number of key individuals whose injury or death may significantly affect the successful operation of the business. Consequently, agricultural production loans may involve a greater degree of risk than other types of loans. Leases: The loss forecasting model applies the historical rate of loss for similar loans over the expected life of the asset. Leases typically represent an elevated level of credit risk as compared to loans secured by real estate as the collateral for leases is often subject to a more rapid rate of depreciation or depletion. The ultimate severity of loss is impacted by the type of collateral securing the exposure, the size of the exposure, the borrower’s industry sector, any guarantors and the geographic market. Assumptions of expected loss are conditioned to the economic outlook and the other variables discussed above. Unfunded commitments : The estimated credit losses associated with these unfunded lending commitments is calculated using the same models and methodologies noted above and incorporate utilization assumptions at time of default. The reserve for unfunded commitments is maintained on the consolidated balance sheet in other liabilities.
Accounting Standards Adopted in 2021 and Pending Adoption	Accounting Standards Adopted in 2021 On January 1, 2021, the Company adopted ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This ASU simplified the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The guidance also promoted consistent application and simplification of GAAP for other areas of Topic 740 by clarifying and amending existing guidance. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) was enacted in response to the Coronavirus Disease 2019 (COVID-19) pandemic. The CARES Act provides optional temporary relief from troubled debt restructuring and impairment accounting requirements for loan modifications related to the COVID-19 pandemic made during the period from March 1, 2020 to the earlier of December 31, 2020 or 60 days after the national emergency concerning COVID-19 declared by the President terminates. The applicable period for this relief was extended through 2021 by way of the Consolidated Appropriations Act. Following the passage of the CARES Act legislation, the "Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus" was issued by federal bank regulators, which similarly offers temporary relief from troubled debt restructuring accounting for loan payment deferrals for certain customers whose businesses are experiencing economic hardship due to Coronavirus. The Interagency Statement requires the modification event to be short-term and COVID-19 related, requiring the borrower be not more than 30 days past due as of the date the modification program was implemented, and allowing Management to apply judgement as when the modification program terminates. The ability to suspend TDR accounting under either program does not apply to any adverse impact on the credit of a borrower that is not related to the COVID-19 pandemic. Accounting Standards Pending Adoption FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This ASU provides temporary optional guidance to ease the potential burden in accounting for reference rate reform by providing optional expedients and exceptions for applying generally accepted accounting principles (GAAP) to contracts, hedging

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
Investment Securities (Tables)	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Estimated Fair Values of Investments Securities	The amortized cost, estimated fair values and allowance for credit losses of investments in debt securities are summarized in the following tables: March 31, 2021 (in thousands) Amortized Gross Gross Allowance for Credit Losses Estimated Debt Securities Available for Sale Obligations of U.S. government agencies $ 1,029,611 $ 11,056 $ (7,733) $ — $ 1,032,934 Obligations of states and political subdivisions 136,709 5,246 (1,571) — 140,384 Corporate bonds 2,466 68 — — 2,534 Asset backed securities 506,473 2,645 (2,865) — 506,253 Total debt securities available for sale $ 1,675,259 $ 19,015 $ (12,169) $ — $ 1,682,105 Debt Securities Held to Maturity Obligations of U.S. government agencies $ 250,178 $ 10,643 $ — $ — $ 260,821 Obligations of states and political subdivisions 10,276 342 — — 10,618 Total debt securities held to maturity $ 260,454 $ 10,985 $ — $ — $ 271,439 December 31, 2020 (in thousands) Amortized Gross Gross Allowance for Credit Losses Estimated Debt Securities Available for Sale Obligations of U.S. government agencies $ 795,555 $ 17,710 $ (891) $ — $ 812,374 Obligations of states and political subdivisions 123,347 5,748 — — 129,095 Corporate bonds 2,459 85 — — 2,544 Asset backed securities 473,720 1,682 (5,151) — 470,251 Total debt securities available for sale $ 1,395,081 $ 25,225 $ (6,042) $ — $ 1,414,264 Debt Securities Held to Maturity Obligations of U.S. government agencies 273,667 13,774 — $ — 287,441 Obligations of states and political subdivisions 10,896 389 — — 11,285 Total debt securities held to maturity $ 284,563 $ 14,163 $ — $ — $ 298,726
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity	As of March 31, 2021, the contractual final maturity for available for sale and held to maturity investment securities is as follows: Debt Securities Available for Sale Held to Maturity (in thousands) Amortized Estimated Amortized Estimated Due in one year $ 990 $ 1,018 $ — $ — Due after one year through five years 182,664 182,915 1,003 1,118 Due after five years through ten years 262,409 262,888 21,248 21,967 Due after ten years 1,229,196 1,235,284 238,203 248,354 Totals $ 1,675,259 $ 1,682,105 $ 260,454 $ 271,439
Gross Unrealized Losses on Investment Securities	Gross unrealized losses on debt 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: March 31, 2021: Less than 12 months 12 months or more Total (in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Debt Securities Available for Sale Obligations of U.S. government agencies $ 664,219 $ (7,733) $ — $ — $ 664,219 $ (7,733) Obligations of states and political subdivisions 38,529 (1,571) — — 38,529 (1,571) Asset backed securities 86,698 (271) 218,077 (2,594) 304,775 (2,865) Total debt securities available for sale $ 789,446 $ (9,575) $ 218,077 $ (2,594) $ 1,007,523 $ (12,169) December 31, 2020: Less than 12 months 12 months or more Total (in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Debt Securities Available for Sale Obligations of U.S. government agencies $ 160,543 $ (891) $ — $ — $ 160,543 $ (891) Asset backed securities 51,544 (441) 297,020 (4,710) 348,564 (5,151) Total debt securities available for sale $ 212,087 $ (1,332) $ 297,020 $ (4,710) $ 509,107 $ (6,042)
Amortized Cost of Debt Securities Held-to-Maturity	The following table summarizes the amortized cost of debt securities held-to-maturity at the dates indicated, aggregated by credit quality indicator: March 31, 2021 December 31, 2020 AAA/AA/A BBB/BB/B AAA/AA/A BBB/BB/B (In thousands) (In thousands) Debt Securities Held to Maturity Obligations of U.S. government agencies $ 250,178 $ — $ 273,667 $ — Obligations of states and political subdivisions 10,276 — 10,896 — Total debt securities held to maturity $ 260,454 $ — $ 284,563 $ —

Loans (Tables)

Loans (Tables)	3 Months Ended
Loans (Tables)	Mar. 31, 2021
Receivables [Abstract]
Summary of Loan Balances	A summary of loan balances follows: (in thousands) March 31, 2021 December 31, 2020 Commercial real estate: CRE non-owner occupied $ 1,554,927 $ 1,535,555 CRE owner occupied 641,216 624,375 Multifamily 764,884 639,480 Farmland 147,597 152,492 Total commercial real estate loans 3,108,624 2,951,902 Consumer: SFR 1-4 1st DT liens 636,824 546,592 SFR HELOCs and junior liens 331,333 327,484 Other 73,056 78,032 Total consumer loans 1,041,213 952,108 Commercial and industrial 551,077 526,327 Construction 221,613 284,842 Agriculture production 39,753 44,164 Leases 4,697 3,784 Total loans, net of deferred loan fees and discounts $ 4,966,977 $ 4,763,127 Total principal balance of loans owed, net of charge-offs $ 5,009,686 $ 4,805,596 Unamortized net deferred loan fees (20,108) (16,984) Discounts to principal balance of loans owed, net of charge-offs (22,601) (25,485) Total loans, net of unamortized deferred loan fees and discounts $ 4,966,977 $ 4,763,127 Allowance for credit losses on loans $ (85,941) $ (91,847)

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	3 Months Ended
Allowance for Credit Losses (Tables)	Mar. 31, 2021
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	For the periods indicated, the following tables summarize the activity in the allowance for credit losses on loans which is recorded as a contra asset, and the reserve for unfunded commitments which is recorded on the balance sheet within other liabilities: Allowance for credit losses – Three months ended March 31, 2021 (in thousands) Beginning Charge-offs Recoveries Provision (benefit) Ending Commercial real estate: CRE non-owner occupied $ 29,380 $ — $ 2 $ (2,948) $ 26,434 CRE owner occupied 10,861 — 1 (988) 9,874 Multifamily 11,472 — — 899 12,371 Farmland 1,980 — — (256) 1,724 Total commercial real estate loans 53,693 — 3 (3,293) 50,403 Consumer: SFR 1-4 1st DT liens 10,117 — 10 538 10,665 SFR HELOCs and junior liens 11,771 — 285 (977) 11,079 Other 3,260 (193) 106 (313) 2,860 Total consumer loans 25,148 (193) 401 (752) 24,604 Commercial and industrial 4,252 (33) 136 109 4,464 Construction 7,540 — — (2,064) 5,476 Agriculture production 1,209 — 20 (241) 988 Leases 5 — — 1 6 Allowance for credit losses on loans 91,847 (226) 560 (6,240) 85,941 Reserve for unfunded commitments 3,400 — — 180 3,580 Total $ 95,247 $ (226) $ 560 $ (6,060) $ 89,521 Allowance for credit losses – Year ended December 31, 2020 (in thousands) Beginning Adoption of CECL Charge-offs Recoveries Provision Ending Balance Commercial real estate: CRE non-owner occupied $ 5,948 $ 6,701 $ — $ 198 $ 16,533 $ 29,380 CRE owner occupied 2,027 2,281 — 28 6,525 10,861 Multifamily 3,352 2,281 — — 5,839 11,472 Farmland 668 585 (182) — 909 1,980 Total commercial real estate loans 11,995 11,848 (182) 226 29,806 53,693 Consumer: SFR 1-4 1st DT liens 2,306 2,675 (13) 416 4,733 10,117 SFR HELOCs and junior liens 6,183 4,638 (116) 304 762 11,771 Other 1,595 971 (670) 347 1,017 3,260 Total consumer loans 10,084 8,284 (799) 1,067 6,512 25,148 Commercial and industrial 4,867 (1,961) (774) 568 1,552 4,252 Construction 3,388 933 — — 3,219 7,540 Agriculture production 261 (179) — 24 1,103 1,209 Leases 21 (12) — — (4) 5 Allowance for credit losses on loans 30,616 18,913 (1,755) 1,885 42,188 91,847 Reserve for unfunded commitments 2,775 — — — 625 3,400 Total $ 33,391 $ 18,913 $ (1,755) $ 1,885 $ 42,813 $ 95,247 On January 1, 2020, the Company adopted ASU 2016-03 Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , which replaces the incurred loss methodology that is referred to as the current expected credit loss (CECL) methodology. The Company recognized an increase in the ACL for loans totaling $18,913,000, including a reclassification of $481,000 from discounts on acquired loans to the allowance for credit losses, as a cumulative effect adjustment from change in accounting policies, with a corresponding decrease in retained earnings, net of $5,449,000 in taxes of $12,983,000. Allowance for loan losses – Three months ended March 31, 2020 (in thousands) Beginning Adoption of CECL Charge-offs Recoveries Provision Ending Balance Commercial real estate: CRE non-owner occupied $ 5,948 $ 6,701 $ — $ 189 $ 5,195 $ 18,033 CRE owner occupied 2,027 2,281 — 5 1,052 5,365 Multifamily 3,352 2,281 — — (493) 5,140 Farmland 668 585 — — (541) 712 Total commercial real estate loans 11,995 11,848 — 194 5,213 29,250 Consumer: SFR 1-4 1st DT liens 2,306 2,675 — 410 259 5,650 SFR HELOCs and junior liens 6,183 4,638 — 48 327 11,196 Other 1,595 971 (130) 94 216 2,746 Total consumer loans 10,084 8,284 (130) 552 802 19,592 Commercial and industrial 4,867 (1,961) (380) 126 1,216 3,868 Construction 3,388 933 — — 274 4,595 Agriculture production 261 (179) — 20 493 595 Leases 21 (12) — — 2 11 Allowance for credit losses on loans 30,616 18,913 (510) 892 8,000 57,911 Reserve for unfunded commitments 2,775 — — — — 2,775 Total $ 33,391 $ 18,913 $ (510) $ 892 $ 8,000 $ 60,686
Schedule Credit Quality Indicators	Based on the most recent analysis performed, the risk category of loans by class of loans is as follows for the period indicated: Term Loans Amortized Cost Basis by Origination Year – As of March 31, 2021 (in thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: CRE non-owner occupied risk ratings Pass $ 58,047 $ 130,667 $ 205,818 $ 147,766 $ 252,414 $ 620,082 $ 65,028 $ — $ 1,479,822 Special Mention — — 6,226 11,683 12,245 19,053 12,001 — 61,208 Substandard — — — 1,432 577 11,888 — — 13,897 Doubtful/Loss — — — — — — — — — Total CRE non-owner occupied risk ratings $ 58,047 $ 130,667 $ 212,044 $ 160,881 $ 265,236 $ 651,023 $ 77,029 $ — $ 1,554,927 Term Loans Amortized Cost Basis by Origination Year – As of March 31, 2021 (in thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: CRE owner occupied risk ratings Pass $ 36,465 $ 104,653 $ 73,669 $ 52,367 $ 57,770 $ 270,655 $ 22,402 $ — $ 617,981 Special Mention — — — 288 7,171 8,916 — — 16,375 Substandard — — 1,505 1,282 470 3,603 — — 6,860 Doubtful/Loss — — — — — — — — — Total CRE owner occupied risk ratings $ 36,465 $ 104,653 $ 75,174 $ 53,937 $ 65,411 $ 283,174 $ 22,402 $ — $ 641,216 Commercial real estate: Multifamily risk ratings Pass $ 121,003 $ 82,738 $ 118,173 $ 118,297 $ 68,886 $ 187,843 $ 20,771 $ — $ 717,711 Special Mention — 9,383 — — — 24,679 8,759 — 42,821 Substandard — — 4,352 — — — — — 4,352 Doubtful/Loss — — — — — — — — — Total multifamily loans $ 121,003 $ 92,121 $ 122,525 $ 118,297 $ 68,886 $ 212,522 $ 29,530 $ — $ 764,884 Commercial real estate: Farmland risk ratings Pass $ 4,669 $ 18,083 $ 22,496 $ 18,659 $ 8,467 $ 23,026 $ 38,076 $ — $ 133,476 Special Mention — — — — 1,196 3,316 1,653 — 6,165 Substandard — — 3,266 — 596 1,144 2,950 — 7,956 Doubtful/Loss — — — — — — — — — Total farmland loans $ 4,669 $ 18,083 $ 25,762 $ 18,659 $ 10,259 $ 27,486 $ 42,679 $ — $ 147,597 Consumer loans: SFR 1-4 1st DT liens risk ratings Pass $ 125,704 $ 186,594 $ 72,632 $ 33,274 $ 47,410 $ 152,614 $ — $ 5,039 $ 623,267 Special Mention — — 289 682 421 2,803 — 1,073 5,268 Substandard — — — 1,151 680 6,096 — 362 8,289 Doubtful/Loss — — — — — — — — — Total SFR 1st DT liens $ 125,704 $ 186,594 $ 72,921 $ 35,107 $ 48,511 $ 161,513 $ — $ 6,474 $ 636,824 Consumer loans: SFR HELOCs and Junior Liens Pass $ 700 $ 85 $ — $ 12 $ 343 $ 958 $ 303,290 $ 12,920 $ 318,308 Special Mention — — — 16 — 139 4,254 785 5,194 Substandard — — — — — 33 6,146 1,652 7,831 Doubtful/Loss — — — — — — — — — Total SFR HELOCs and Junior Liens $ 700 $ 85 $ — $ 28 $ 343 $ 1,130 $ 313,690 $ 15,357 $ 331,333 Term Loans Amortized Cost Basis by Origination Year – As of March 31, 2021 (in thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Consumer loans: Other risk ratings Pass $ 5,880 $ 21,727 $ 26,153 $ 12,095 $ 3,472 $ 1,632 $ 889 $ — $ 71,848 Special Mention — 55 202 249 36 78 77 — 697 Substandard — 57 79 134 85 147 9 — 511 Doubtful/Loss — — — — — — — — — Total other consumer loans $ 5,880 $ 21,839 $ 26,434 $ 12,478 $ 3,593 $ 1,857 $ 975 $ — $ 73,056 Commercial and industrial loans: Commercial and industrial risk ratings Pass $ 177,482 $ 216,547 $ 44,666 $ 17,226 $ 11,974 $ 12,802 $ 61,969 $ 964 $ 543,630 Special Mention — — 96 602 169 176 2,558 10 3,611 Substandard — — 282 104 1,375 812 1,188 75 3,836 Doubtful/Loss — — — — — — — — — Total commercial and industrial loans $ 177,482 $ 216,547 $ 45,044 $ 17,932 $ 13,518 $ 13,790 $ 65,715 $ 1,049 $ 551,077 Construction loans: Construction risk ratings Pass $ 1,711 $ 76,063 $ 44,589 $ 37,820 $ 31,303 $ 23,442 $ — $ — $ 214,928 Special Mention — — — — 346 1,756 — — 2,102 Substandard — — — — — 4,583 — — 4,583 Doubtful/Loss — — — — — — — — — Total construction loans $ 1,711 $ 76,063 $ 44,589 $ 37,820 $ 31,649 $ 29,781 $ — $ — $ 221,613 Agriculture production loans: Agriculture production risk ratings Pass $ 262 $ 897 $ 1,959 $ 1,288 $ 1,582 $ 1,108 $ 32,416 $ — $ 39,512 Special Mention — — — 189 — 47 — — 236 Substandard — — — — — 5 — — 5 Doubtful/Loss — — — — — — — — — Total agriculture production loans $ 262 $ 897 $ 1,959 $ 1,477 $ 1,582 $ 1,160 $ 32,416 $ — $ 39,753 Leases: Lease risk ratings Pass $ 4,697 $ — $ — $ — $ — $ — $ — $ — $4,697 Special Mention — — — — — — — — — Substandard — — — — — — — — — Doubtful/Loss — — — — — — — — — Total leases $ 4,697 $ — $ — $ — $ — $ — $ — $ — $ 4,697 Term Loans Amortized Cost Basis by Origination Year – As of March 31, 2021 (in thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Total loans outstanding: Risk ratings Pass $ 536,620 $ 838,054 $ 610,155 $ 438,804 $ 483,621 $ 1,294,162 $ 544,841 $ 18,923 $ 4,765,180 Special Mention — 9,438 6,813 13,709 21,584 60,963 29,302 1,868 143,677 Substandard — 57 9,484 4,103 3,783 28,311 10,293 2,089 58,120 Doubtful/Loss — — — — — — — — — Total loans outstanding $ 536,620 $ 847,549 $ 626,452 $ 456,616 $ 508,988 $ 1,383,436 $ 584,436 $ 22,880 $ 4,966,977 Term Loans Amortized Cost Basis by Origination Year – As of December 31, 2020 (in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: CRE non-owner occupied risk ratings Pass $ 120,520 $ 207,899 $ 155,730 $ 256,677 $ 179,523 $ 460,644 $ 76,730 $ — $ 1,457,723 Special Mention — 7,455 11,692 5,407 15,773 18,832 12,205 — 71,364 Substandard — — 1,449 584 2,147 2,288 — — 6,468 Doubtful/Loss — — — — — — — — — Total CRE non-owner occupied risk ratings $ 120,520 $ 215,354 $ 168,871 $ 262,668 $ 197,443 $ 481,764 $ 88,935 $ — $ 1,535,555 Commercial real estate: CRE owner occupied risk ratings Pass $ 105,896 $ 75,144 $ 53,816 $ 58,371 $ 54,541 $ 227,828 $ 25,508 $ — $ 601,104 Special Mention — — 288 7,451 2,955 6,140 — — 16,834 Substandard — 1,533 1,301 475 1,306 1,822 — — 6,437 Doubtful/Loss — — — — — — — — — Total CRE owner occupied risk ratings $ 105,896 $ 76,677 $ 55,405 $ 66,297 $ 58,802 $ 235,790 $ 25,508 $ — $ 624,375 Commercial real estate: Multifamily risk ratings Pass $ 77,646 $ 118,725 $ 113,882 $ 70,112 $ 67,457 $ 123,518 $ 19,007 $ — $ 590,347 Special Mention 9,441 — — 603 24,687 772 9,259 — 44,762 Substandard — 4,371 — — — — — — — 4,371 Doubtful/Loss — — — — — — — — — Total multifamily loans $ 87,087 $ 123,096 $ 113,882 $ 70,715 $ 92,144 $ 124,290 $ 28,266 $ — $ 639,480 Term Loans Amortized Cost Basis by Origination Year – As of December 31, 2020 (in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: Farmland risk ratings Pass $ 17,640 $ 25,003 $ 19,148 $ 12,834 $ 7,377 $ 17,129 $ 39,411 $ — $ 138,542 Special Mention — 2,567 — 1,271 227 3,107 2,258 — 9,430 Substandard — 700 — 602 — 1,214 2,004 — 4,520 Doubtful/Loss — — — — — — — — — Total farmland loans $ 17,640 $ 28,270 $ 19,148 $ 14,707 $ 7,604 $ 21,450 $ 43,673 $ — $ 152,492 Consumer loans: SFR 1-4 1st DT liens risk ratings Pass $ 183,719 $ 80,717 $ 36,342 $ 53,001 $ 46,467 $ 126,465 $ 76 $ 5,507 $ 532,294 Special Mention — 290 684 110 15 2,936 — 934 4,969 Substandard — — 1,174 929 935 5,763 — 528 9,329 Doubtful/Loss — — — — — — — — — Total SFR 1st DT liens $ 183,719 $ 81,007 $ 38,200 $ 54,040 $ 47,417 $ 135,164 $ 76 $ 6,969 $ 546,592 Consumer loans: SFR HELOCs and Junior Liens Pass $ 793 $ — $ 13 $ 360 $ 300 $ 910 $ 297,160 $ 14,051 $ 313,587 Special Mention — — 16 — — 83 4,504 789 5,392 Substandard — — — — — 39 6,698 1,768 8,505 Doubtful/Loss — — — — — — — — — Total SFR HELOCs and Junior Liens $ 793 $ — $ 29 $ 360 $ 300 $ 1,032 $ 308,362 $ 16,608 $ 327,484 Consumer loans: Other risk ratings Pass $ 25,876 $ 29,539 $ 14,170 $ 4,238 $ 1,020 $ 967 $ 986 $ — $ 76,796 Special Mention 43 208 147 74 24 65 90 — 651 Substandard 58 82 210 74 12 140 9 — 585 Doubtful/Loss — — — — — — — — — Total other consumer loans $ 25,977 $ 29,829 $ 14,527 $ 4,386 $ 1,056 $ 1,172 $ 1,085 $ — $ 78,032 Commercial and industrial loans: Commercial and industrial risk ratings Pass $ 356,701 $ 48,838 $ 20,463 $ 13,151 $ 5,185 $ 9,490 $ 65,938 $ 1,085 $ 520,851 Special Mention — 102 698 195 20 178 207 11 1,411 Substandard — 301 53 1,142 823 148 1,519 79 4,065 Doubtful/Loss — — — — — — — — — Total commercial and industrial loans $ 356,701 $ 49,241 $ 21,214 $ 14,488 $ 6,028 $ 9,816 $ 67,664 $ 1,175 $ 526,327 Term Loans Amortized Cost Basis by Origination Year – As of December 31, 2020 (in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Construction loans: Construction risk ratings Pass 69,133 41,786 92,191 51,082 20,868 2,876 — $ — $ 277,936 Special Mention — — — 346 — 1,780 — — 2,126 Substandard — — — — 4,529 251 — — 4,780 Doubtful/Loss — — — — — — — — — Total construction loans $ 69,133 $ 41,786 $ 92,191 $ 51,428 $ 25,397 $ 4,907 $ — $ — $ 284,842 Agriculture production loans: Agriculture production risk ratings Pass $ 977 $ 2,079 $ 1,590 $ 1,838 $ 663 $ 708 $ 36,051 $ — $ 43,906 Special Mention — — 203 — 49 — — — 252 Substandard — — — — 6 — — — 6 Doubtful/Loss — — — — — — — — — Total agriculture production loans $ 977 $ 2,079 $ 1,793 $ 1,838 $ 718 $ 708 $ 36,051 $ — $ 44,164 Leases: Lease risk ratings Pass $ 3,784 $ — $ — $ — $ — $ — $ — $ — $ 3,784 Special Mention — — — — — — — — — Substandard — — — — — — — — — Doubtful/Loss — — — — — — — — — Total leases $ 3,784 $ — $ — $ — $ — $ — $ — $ — $ 3,784 Total loans outstanding: Risk ratings Pass $ 962,685 $ 629,730 $ 507,345 $ 521,664 $ 383,401 $ 970,535 $ 560,867 $ 20,643 $ 4,556,870 Special Mention 9,484 10,622 13,728 15,457 43,750 33,893 28,523 1,734 157,191 Substandard 58 6,987 4,187 3,806 9,758 11,665 10,230 2,375 49,066 Doubtful/Loss — — — — — — — — — Total loans outstanding $ 972,227 $ 647,339 $ 525,260 $ 540,927 $ 436,909 $ 1,016,093 $ 599,620 $ 24,752 $ 4,763,127
Analysis of Past Due Loans	The following table shows the ending balance of current and past due originated loans by loan category as of the date indicated: Analysis of Past Due Loans - As of March 31, 2021 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total Commercial real estate: CRE non-owner occupied $ 55 $ 354 $ 4,110 $ 4,519 $ 1,550,408 $ 1,554,927 CRE owner occupied 158 — 589 747 640,469 641,216 Multifamily — — — — 764,884 764,884 Farmland — — 847 847 146,750 147,597 Total commercial real estate loans 213 354 5,546 6,113 3,102,511 3,108,624 Consumer: SFR 1-4 1st DT liens — — 881 881 635,943 636,824 SFR HELOCs and junior liens 59 490 1,472 2,021 329,312 331,333 Other 66 13 31 110 72,946 73,056 Total consumer loans 125 503 2,384 3,012 1,038,201 1,041,213 Commercial and industrial 152 168 771 1,091 549,986 551,077 Construction 295 — — 295 221,318 221,613 Agriculture production 39 — — 39 39,714 39,753 Leases — — — — 4,697 4,697 Total $ 824 $ 1,025 $ 8,701 $ 10,550 $ 4,956,427 $ 4,966,977 Analysis of Past Due Loans - As of December 31, 2020 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total Commercial real estate: CRE non-owner occupied $ 127 $ 173 $ 239 $ 539 $ 1,535,016 $ 1,535,555 CRE owner occupied 297 824 1,121 623,254 624,375 Multifamily — — — — 639,480 639,480 Farmland 899 — 70 969 151,523 152,492 Total commercial real estate loans 1,323 173 1,133 2,629 2,949,273 2,951,902 Consumer: SFR 1-4 1st DT liens 37 — 960 997 545,595 546,592 SFR HELOCs and junior liens 418 212 1,671 2,301 325,183 327,484 Other 41 13 100 154 77,878 78,032 Total consumer loans 496 225 2,731 3,452 948,656 952,108 Commercial and industrial 155 426 105 686 525,641 526,327 Construction — — — — 284,842 284,842 Agriculture production — — — — 44,164 44,164 Leases — — — — 3,784 3,784 Total $ 1,974 $ 824 $ 3,969 $ 6,767 $ 4,756,360 $ 4,763,127
Schedule of Non Accrual Loans	The following table shows the ending balance of non accrual loans by loan category as of the date indicated: Non Accrual Loans As of March 31, 2021 As of December 31, 2020 (in thousands) Non accrual with no allowance for credit losses Total non accrual Past due 90 days or more and still accruing Non accrual with no allowance for credit losses Total non accrual Past due 90 days or more and still accruing Commercial real estate: CRE non-owner occupied $ 7,000 $ 7,000 $ — $ 3,110 $ 3,110 $ — CRE owner occupied 2,833 3,762 — 3,111 4,061 — Multifamily — — — — — — Farmland 1,431 1,431 — 1,468 1,538 — Total commercial real estate loans 11,264 12,193 — 7,689 8,709 — Consumer: SFR 1-4 1st DT liens 4,853 4,996 — 4,950 5,093 — SFR HELOCs and junior liens 4,187 5,142 — 4,480 6,148 — Other 52 103 — 68 167 — Total consumer loans 9,092 10,241 — 9,498 11,408 — Commercial and industrial 108 1,774 245 652 2,183 — Construction 4,483 4,483 — 4,546 4,546 — Agriculture production 5 5 — 5 18 — Leases — — — — — — Sub-total 24,952 28,696 245 22,390 26,864 — Less: Guaranteed loans (814) (814) — (687) (811) Total, net $ 24,138 $ 27,882 $ 245 $ 21,703 $ 26,053 $ —
Amortized Cost Basis of Collateral Dependent Loans, By Class of Loan	The following tables present the amortized cost basis of collateral dependent loans by class of loans as of the following periods: As of March 31, 2021 (in thousands) Retail Office Warehouse Other Multifamily Farmland SFR -1st Deed SFR -2nd Deed Automobile/Truck A/R and Inventory Equipment Total Commercial real estate: CRE non-owner occupied $ 2,630 $ 427 $ — $ 3,943 $ — $ — $ — $ — $ — $ — $ — $ 7,000 CRE owner occupied 781 927 1,640 414 — — — — — — — 3,762 Multifamily — — — — — — — — — — — — Farmland — — — — — 1,431 — — — — — 1,431 Total commercial real estate loans 3,411 1,354 1,640 4,357 — 1,431 — — — — — 12,193 Consumer: SFR 1-4 1st DT liens — — — — — — 4,996 — — — — 4,996 SFR HELOCs and junior liens — — — — — — 1,882 2,471 — — — 4,353 Other — — — 69 — — — — 25 — — 94 Total consumer loans — — — 69 — — 6,878 2,471 25 — — 9,443 Commercial and industrial — — — 272 — — — — — 1,288 214 1,774 Construction — — — — — — 4,483 — — — — 4,483 Agriculture production — — — — — — — — — — 5 5 Leases — — — — — — — — — — — — Total $ 3,411 $ 1,354 $ 1,640 $ 4,698 $ — $ 1,431 $ 11,361 $ 2,471 $ 25 $ 1,288 $ 219 $ 27,898 As of December 31, 2020 (in thousands) Retail Office Warehouse Other Multifamily Farmland SFR -1st Deed SFR -2nd Deed Automobile/Truck A/R and Inventory Equipment Total Commercial real estate: CRE non-owner occupied $ 2,445 $ 435 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ 2,880 CRE owner occupied 796 1,176 1,668 — — — — — — — — 3,640 Multifamily — — — — — — — — — — — — Farmland — — — — — — 1,538 — — — — — 1,538 Total commercial real estate loans 3,241 1,611 1,668 — — 1,538 — — — — — 8,058 Consumer: SFR 1-4 1st DT liens — — — — — — 5,068 — — — — 5,068 SFR HELOCs and junior liens — — — — — — 1,855 2,839 — — — 4,694 Other — — — 42 — — — — 97 — — 139 Total consumer loans — — — 42 — — 6,923 2,839 97 — — 9,901 Commercial and industrial — — — 292 — — — — — 1,173 75 1,540 Construction — — — — — — 4,547 — — — — 4,547 Agriculture production — — — — — — — — — 13 5 18 Leases — — — — — — — — — — — — Total $ 3,241 $ 1,611 $ 1,668 $ 334 $ — $ 1,538 $ 11,470 $ 2,839 $ 97 $ 1,186 $ 80 $ 24,064
Troubled Debt Restructurings	The following tables show certain information regarding TDRs that occurred during the periods indicated: TDR information for the three months ended March 31, 2021 (dollars in thousands) Number Pre-mod Post-mod Financial Number that Recorded Financial impact Commercial real estate: CRE non-owner occupied 1 $ 317 $ 314 $ 314 — $ — $ — CRE owner occupied 1 740 742 742 — — — Multifamily — — — — — — — Farmland — — — — 3 847 — Total commercial real estate loans 2 1,057 1,056 1,056 3 847 — Consumer: SFR 1-4 1st DT liens — — — — — — — SFR HELOCs and junior liens — — — — — — — Other — — — — — — — Total consumer loans — — — — — — — Commercial and industrial 3 316 310 310 1 247 — Construction — — — — — — — Agriculture production — — — — — — — Leases — — — — — — — Total 5 $ 1,373 $ 1,366 $ 1,366 4 $ 1,094 $ — TDR information for the three months ended March 31, 2020 (dollars in thousands) Number Pre-mod Post-mod Financial Number that Recorded Financial impact Commercial real estate: CRE non-owner occupied 1 $ 257 $ 251 $ — — $ — $ — CRE owner occupied — — — — — — — Multifamily — — — — — — — Farmland 2 230 298 — — — — Total commercial real estate loans 3 487 549 — — — — Consumer: SFR 1-4 1st DT liens — — — — 1 302 — SFR HELOCs and junior liens 2 172 169 — — — — Other — — — — — — — Total consumer loans 2 172 169 — 1 302 — Commercial and industrial 1 21 20 21 — — — Construction — — — — — — — Agriculture production — — — — — — — Leases — — — — — — — Total 6 $ 680 $ 738 $ 21 1 $ 302 $ —

Leases (Tables)

Leases (Tables)	3 Months Ended
Leases (Tables)	Mar. 31, 2021
Leases [Abstract]
Components of Lease Expense	The following table presents the components of lease expense for the periods ended: Three months ended March 31, (in thousands) 2021 2020 Operating lease cost $ 1,258 $ 1,294 Short-term lease cost 61 63 Variable lease cost (2) 6 Sublease income (13) (34) Total lease cost $ 1,304 $ 1,329
Supplemental Cash Flow Information Related to Leases	The following table presents supplemental cash flow information related to leases for the periods ended: Three months ended March 31, (in thousands) 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 1,204 $ 1,237 ROUA obtained in exchange for operating lease liabilities $ 1,308 $ 3,393
Weighted Average Operating Lease Term And Discount Rate	The following table presents the weighted average operating lease term and discount rate as of the period ended: March 31, 2021 2020 Weighted-average remaining lease term (years) 9.8 10.3 Weighted-average discount rate 3.03 % 3.17 %
Future Expected Operating Lease Payments	At March 31, 2021, future expected operating lease payments are as follows: (in thousands) Periods ending December 31, 2021 $ 3,505 2022 4,320 2023 3,649 2024 3,377 2025 2,916 Thereafter 14,933 32,700 Discount for present value of expected cash flows (4,920) Lease liability at March 31, 2021 $ 27,780

Deposits (Tables)

Deposits (Tables)	3 Months Ended
Deposits (Tables)	Mar. 31, 2021
Deposits [Abstract]
Summary of Balances of Deposits	A summary of the balances of deposits follows (in thousands): March 31, December 31, Noninterest-bearing demand $ 2,766,510 $ 2,581,517 Interest-bearing demand 1,465,915 1,414,908 Savings 2,302,927 2,164,942 Time certificates, $250,000 or more 64,509 73,147 Other time certificates 263,539 271,420 Total deposits $ 6,863,400 $ 6,505,934

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
Commitments and Contingencies (Tables)	Mar. 31, 2021
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: (in thousands) March 31, December 31, Financial instruments whose amounts represent risk: Commitments to extend credit: Commercial loans $ 473,971 $ 462,422 Consumer loans 539,670 534,223 Real estate mortgage loans 231,509 202,306 Real estate construction loans 231,697 227,876 Standby letters of credit 14,543 15,056 Deposit account overdraft privilege 122,965 110,813

Stock Options and Other Equit_2

Stock Options and Other Equity-Based Incentive Instruments (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock Option Activity	Stock option activity during the three months ended March 31, 2021 is summarized in the following table: Number Option Price Weighted Outstanding at December 31, 2020 128,500 $14.54 to $23.21 $ 17.72 Options granted — — — Options exercised — $— to $— — Options forfeited — — — Outstanding at March 31, 2021 128,500 $14.54 to $23.21 $ 17.72
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 March 31, 2021: Currently Currently Not Total Number of options 128,500 — 128,500 Weighted average exercise price $ 17.72 $ — $ 17.72 Intrinsic value (in thousands) $ 3,810 $ — $ 3,810 Weighted average remaining contractual term (yrs.) 1.7 n/a 1.7
Restricted Stock Unit (RSU) Activity	Activity related to restricted stock unit awards during the three months ended March 31, 2021 is summarized in the following table: Service Market Plus Outstanding at December 31, 2020 99,809 81,615 RSUs granted — — RSUs added through dividend and performance credits 504 — RSUs released (201) — RSUs forfeited/expired (55) — Outstanding at March 31, 2021 100,057 81,615

Non-interest Income and Expen_2

Non-interest Income and Expense (Tables)	3 Months Ended
Non-interest Income and Expense (Tables)	Mar. 31, 2021
Other Income and Expenses [Abstract]
Components of Non-Interest Income	The following table summarizes the Company’s non-interest income for the periods indicated: Three months ended (dollars in thousands) 2021 2020 ATM and interchange fees $ 5,861 $ 5,111 Service charges on deposit accounts 3,269 4,046 Other service fees 871 758 Mortgage banking service fees 463 469 Change in value of mortgage servicing rights 12 (1,258) Total service charges and fees 10,476 9,126 Increase in cash value of life insurance 673 720 Asset management and commission income 834 916 Gain on sale of loans 3,247 891 Lease brokerage income 110 193 Sale of customer checks 119 124 Gain on sale of investment securities — — (Loss) gain on marketable equity securities (53) 47 Other 704 (197) Total other non-interest income 5,634 2,694 Total non-interest income $ 16,110 $ 11,820
Components of Non Interest Expense	The components of non-interest expense were as follows (in thousands): Three months ended 2021 2020 Base salaries, net of deferred loan origination costs $ 15,511 $ 17,623 Incentive compensation 3,580 3,101 Benefits and other compensation costs 6,239 6,548 Total salaries and benefits expense 25,330 27,272 Occupancy 3,726 3,875 Data processing and software 3,202 3,367 Equipment 1,517 1,512 Intangible amortization 1,431 1,431 Advertising 380 665 ATM and POS network charges 1,246 1,373 Professional fees 594 703 Telecommunications 581 725 Regulatory assessments and insurance 612 95 Postage 198 290 Operational losses 209 221 Courier service 294 331 Gain on sale of foreclosed assets (51) (41) Other miscellaneous expense 2,349 2,930 Total other non-interest expense 16,288 17,477 Total non-interest expense $ 41,618 $ 44,749

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
Earnings Per Share (Tables)	Mar. 31, 2021
Earnings Per Share [Abstract]
Computation of Earnings Per Share	Potential common shares that may be issued by the Company relate to outstanding stock options and restricted stock units (RSUs), and are determined using the treasury stock method. Earnings per share have been computed based on the following: Three months ended March 31, (in thousands) 2021 2020 Net income $ 33,649 $ 16,121 Average number of common shares outstanding 29,727 30,395 Effect of dilutive stock options and restricted stock 178 128 Average number of common shares outstanding used to calculate diluted earnings per share 29,905 30,523 Options excluded from diluted earnings per share because of their antidilutive effect — —

Comprehensive Income (Loss) (Ta

Comprehensive Income (Loss) (Tables)	3 Months Ended
Comprehensive Income (Loss) (Tables)	Mar. 31, 2021
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: Three months ended March 31, (in thousands) 2021 2020 Unrealized holding losses on available for sale securities before reclassifications $ (12,337) $ (29,561) Amounts reclassified out of AOCI: Realized gain on debt securities — — Unrealized holding losses on available for sale securities after reclassifications (12,337) (29,561) Tax effect 3,647 8,739 Unrealized holding losses on available for sale securities, net of tax (8,690) (20,822) Change in unfunded status of the supplemental retirement plans before reclassifications (49) 448 Amounts reclassified out of AOCI: Amortization of prior service cost (14) (14) Amortization of actuarial losses 63 478 Total amounts reclassified out of accumulated other comprehensive income 49 464 Change in unfunded status of the supplemental retirement plans after reclassifications — 912 Tax effect — — Change in unfunded status of the supplemental retirement plans, net of tax — 912 Change in joint beneficiary agreement liability before reclassifications (629) — Tax effect — — Change in joint beneficiary agreement liability before reclassifications, net of tax (629) — Total other comprehensive loss $ (9,319) $ (19,910)
Components of Accumulated Other Comprehensive Loss	The components of accumulated other comprehensive income, included in shareholders’ equity, are as follows: (in thousands) March 31, December 31, Net unrealized gain on available for sale securities $ 6,846 $ 19,183 Tax effect (2,024) (5,671) Unrealized holding gain on available for sale securities, net of tax 4,822 13,512 Unfunded status of the supplemental retirement plans (1,294) (1,294) Tax effect 382 382 Unfunded status of the supplemental retirement plans, net of tax (912) (912) Joint beneficiary agreement liability (949) (320) Tax effect — — Joint beneficiary agreement liability, net of tax (949) (320) Accumulated other comprehensive income $ 2,961 $ 12,280

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	3 Months Ended
Fair Value Measurement (Tables)	Mar. 31, 2021
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 March 31, 2021 Total Level 1 Level 2 Level 3 Marketable equity securities $ 2,971 $ 2,971 $ — $ — Debt securities available for sale: Obligations of U.S. government corporations and agencies 1,032,934 — 1,032,934 — Obligations of states and political subdivisions 140,384 — 140,384 — Corporate bonds 2,534 — 2,534 — Asset backed securities 506,253 — 506,253 — Loans held for sale 3,995 — 3,995 — Mortgage servicing rights 5,607 — — 5,607 Total assets measured at fair value $ 1,694,678 $ 2,971 $ 1,686,100 $ 5,607 Fair value at December 31, 2020 Total Level 1 Level 2 Level 3 Marketable equity securities $ 3,025 $ 3,025 $ — $ — Debt securities available for sale: Obligations of U.S. government corporations and agencies 812,374 — 812,374 — Obligations of states and political subdivisions 129,095 — 129,095 — Corporate bonds 2,544 — 2,544 — Asset backed securities 470,251 — 470,251 — Loans held for sale 6,268 — 6,268 — Mortgage servicing rights 5,092 — — 5,092 Total assets measured at fair value $ 1,428,649 $ 3,025 $ 1,420,532 $ 5,092
Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis	The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the time periods indicated. Had there been any transfer into or out of Level 3 during the time periods indicated, the amount included in the “Transfers into (out of) Level 3” column would represent the beginning balance of an item in the period (interim quarter) during which it was transferred (in thousands): Three months ended March 31, Beginning Transfers Change Issuances Ending 2021: Mortgage servicing rights $ 5,092 — $ 12 $ 503 $ 5,607 2020: Mortgage servicing rights $ 6,200 — $ (1,258) $ 226 $ 5,168
Quantitative Information about Recurring Level 3 Fair Value Measurements	The following table presents quantitative information about recurring Level 3 fair value measurements at March 31, 2021 and December 31, 2020: As of March 31, 2021: Fair Value Valuation Unobservable Range, Mortgage Servicing Rights $ 5,607 Discounted cash flow Constant prepayment rate 11% - 24%; 14.2% Discount rate 10% - 14%; 12% As of December 31, 2020: Mortgage Servicing Rights $ 5,092 Discounted cash flow Constant prepayment rate 14% - 20.0%; 17.6% Discount rate 10% - 14%; 12%
Assets and Liabilities Measured at Fair Value on Nonrecurring Basis	The tables below present the recorded investment in assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated (in thousands): March 31, 2021 Total Level 1 Level 2 Level 3 Total Gains (Losses) Fair value: Individually evaluated loans $ 4,557 — — $ 4,557 $ (2,710) Foreclosed assets 214 — — 214 (31) Total assets measured at fair value $ 4,771 $ — $ — $ 4,771 $ (2,741) December 31, 2020 Total Level 1 Level 2 Level 3 Total Gains (Losses) Fair value: Individually evaluated loans $ 1,424 — — $ 1,424 $ (1,489) Foreclosed assets 979 — — 979 155 Total assets measured at fair value $ 2,403 — — $ 2,403 $ (1,334) March 31, 2020 Total Level 1 Level 2 Level 3 Total Gains (Losses) Fair value: Individually evaluated loans $ 105 — — $ 105 $ (107)
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 March 31, 2021: March 31, 2021 Fair Value Valuation Unobservable Inputs Range, Individually evaluated loans $ 4,557 Sales comparison Adjustment for differences between Not meaningful Foreclosed assets (Residential real estate) $ 214 Sales comparison Adjustment for differences between Not meaningful 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, 2020: December 31, 2020 Fair Value Valuation Unobservable Inputs Range, Individually evaluated loans $ 1,424 Sales comparison Adjustment for differences between Not meaningful Foreclosed assets (Residential real estate) $ 979 Sales comparison Adjustment for differences between Not meaningful
Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets	March 31, 2021 December 31, 2020 (in thousands) Carrying Fair Carrying Fair Financial assets: Level 1 inputs: Cash and due from banks $ 94,157 $ 94,157 $ 77,253 $ 77,253 Cash at Federal Reserve and other banks 515,365 515,365 592,298 592,298 Level 2 inputs: Securities held to maturity 260,454 271,439 284,563 298,726 Restricted equity securities 17,250 N/A 17,250 N/A Level 3 inputs: Loans, net 4,881,036 4,885,946 4,671,280 4,753,027 Financial liabilities: Level 2 inputs: Deposits 6,863,400 6,870,196 6,505,934 6,507,235 Other borrowings 36,266 36,266 26,914 26,914 Level 3 inputs: Junior subordinated debt 57,742 57,685 57,635 56,632 (in thousands) Contract Fair Contract Fair Off-balance sheet: Level 3 inputs: Commitments $ 1,476,847 $ 14,768 $ 1,426,827 $ 14,268 Standby letters of credit 14,543 145 15,056 151 Overdraft privilege commitments 122,965 1,229 110,813 1,108

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
Regulatory Matters (Tables)	Mar. 31, 2021
Banking and Thrift [Abstract]
Actual and Required Capital Ratios of Bank	Actual Required for Capital Adequacy Purposes Required to be As of March 31, 2021: Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) Total Capital (to Risk Weighted Assets): Consolidated $ 825,099 15.13 % $ 572,425 10.50 % N/A N/A Tri Counties Bank $ 812,092 14.90 % $ 572,229 10.50 % $ 544,980 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 756,668 13.88 % $ 463,392 8.50 % N/A N/A Tri Counties Bank $ 743,705 13.65 % $ 463,233 8.50 % $ 435,984 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 700,660 12.85 % $ 381,617 7.00 % N/A N/A Tri Counties Bank $ 743,705 13.65 % $ 381,486 7.00 % $ 354,237 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 756,668 10.00 % $ 302,730 4.00 % N/A N/A Tri Counties Bank $ 743,705 9.84 % $ 302,385 4.00 % $ 377,981 5.00 % Actual Required for Capital Adequacy Purposes Required to be As of December 31, 2020: Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) Total Capital (to Risk Weighted Assets): Consolidated $ 793,433 15.22 % $ 547,352 10.50 % N/A N/A Tri Counties Bank $ 780,320 14.97 % $ 547,156 10.50 % $ 521,101 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 727,879 13.96 % $ 443,094 8.50 % N/A N/A Tri Counties Bank $ 714,811 13.72 % $ 442,936 8.50 % $ 416,881 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 671,975 12.89 % $ 364,901 7.00 % N/A N/A Tri Counties Bank $ 714,811 13.72 % $ 364,771 7.00 % $ 338,716 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 727,879 9.93 % $ 293,138 4.00 % N/A N/A Tri Counties Bank $ 714,811 9.76 % $ 292,949 4.00 % $ 366,186 5.00 %

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2021USD ($)officetrustsegmentcounty	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)
Significant Accounting Policies [Line Items]
Number of subsidiary business trusts (in trusts) \| trust	5
Number of loan production offices (in offices) \| office	2
Company's investments in the trusts	$ 1,830,000
Number of business segment (in segments) \| segment	1
Loans contractual past due	90 days
Held-to-maturity, allowance for credit loss	$ 0	$ 0	$ 0
Allowance for credit loss	85,941,000	91,847,000	57,911,000		$ 30,616,000
Allowance for Credit Losses	$ 0	$ 0	$ 0
North Valley Bancorp
Significant Accounting Policies [Line Items]
Number of loan production offices (in offices) \| office	3
Held-to-maturity securities
Significant Accounting Policies [Line Items]
Interest receivable	$ 668,000
ASU 2016-13
Significant Accounting Policies [Line Items]
Allowance for credit loss				$ 18,913,000
Minimum
Significant Accounting Policies [Line Items]
Loan term	5 years
Amortization period	15 years
Maximum
Significant Accounting Policies [Line Items]
Loan term	10 years
Amortization period	30 years
California
Significant Accounting Policies [Line Items]
Number of counties (in counties) \| county	29

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Debt Securities Available for Sale
Amortized Cost	$ 1,675,259,000	$ 1,395,081,000
Gross Unrealized Gains	19,015,000	25,225,000
Gross Unrealized Losses	(12,169,000)	(6,042,000)
Allowance for Credit Losses	0	0	$ 0
Estimated Fair Value	1,682,105,000	1,414,264,000
Debt Securities Held to Maturity
Amortized Cost	260,454,000	284,563,000
Gross Unrealized Gains	10,985,000	14,163,000
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0	$ 0
Estimated Fair Value	271,439,000	298,726,000
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,029,611,000	795,555,000
Gross Unrealized Gains	11,056,000	17,710,000
Gross Unrealized Losses	(7,733,000)	(891,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	1,032,934,000	812,374,000
Debt Securities Held to Maturity
Amortized Cost	250,178,000	273,667,000
Gross Unrealized Gains	10,643,000	13,774,000
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Estimated Fair Value	260,821,000	287,441,000
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	136,709,000	123,347,000
Gross Unrealized Gains	5,246,000	5,748,000
Gross Unrealized Losses	(1,571,000)	0
Allowance for Credit Losses	0	0
Estimated Fair Value	140,384,000	129,095,000
Debt Securities Held to Maturity
Amortized Cost	10,276,000	10,896,000
Gross Unrealized Gains	342,000	389,000
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Estimated Fair Value	10,618,000	11,285,000
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	2,466,000	2,459,000
Gross Unrealized Gains	68,000	85,000
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Estimated Fair Value	2,534,000	2,544,000
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	506,473,000	473,720,000
Gross Unrealized Gains	2,645,000	1,682,000
Gross Unrealized Losses	(2,865,000)	(5,151,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	$ 506,253,000	$ 470,251,000

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	3 Months Ended
Investment Securities - Additional Information (Detail)	Mar. 31, 2021USD ($)investmentSecurity	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)
Investment Securities [Line Items]
Securities pledged as collateral	$ 417,528,000	$ 429,049,000
Residential real estate mortgage-backed securities	$ 1,069,850,000,000
Life of mortgage-backed securities	4 years 6 months 29 days
Impairment losses recognized	$ 0
Allowance for Credit Losses	0	0	$ 0
Obligations of U.S. government agencies
Investment Securities [Line Items]
Allowance for Credit Losses	$ 0	0
Number of available for sale securities in unrealized loss position (in investment securities) \| investmentSecurity	29
Percentage of aggregate depreciation in unrealized losses	1.15%
Obligations of states and political subdivisions
Investment Securities [Line Items]
Allowance for Credit Losses	$ 0	0
Number of available for sale securities in unrealized loss position (in investment securities) \| investmentSecurity	13
Percentage of aggregate depreciation in unrealized losses	3.92%
Asset backed securities
Investment Securities [Line Items]
Allowance for Credit Losses	$ 0	$ 0
Number of available for sale securities in unrealized loss position (in investment securities) \| investmentSecurity	27
Percentage of aggregate depreciation in unrealized losses	0.93%

Investment Securities - Amort_2

Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Due in one year	$ 990
Due after one year through five years	182,664
Due after five years through ten years	262,409
Due after ten years	1,229,196
Amortized Cost	1,675,259	$ 1,395,081
Estimated Fair Value
Due in one year	1,018
Due after one year through five years	182,915
Due after five years through ten years	262,888
Due after ten years	1,235,284
Totals	1,682,105	1,414,264
Amortized Cost
Due in one year	0
Due after one year through five years	1,003
Due after five years through ten years	21,248
Due after ten years	238,203
Totals	260,454	284,563
Estimated Fair Value
Due in one year	0
Due after one year through five years	1,118
Due after five years through ten years	21,967
Due after ten years	248,354
Totals	$ 271,439	$ 298,726

Investment Securities - Gross U

Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available for Sale, Less than 12 Months, Fair Value	$ 789,446	$ 212,087
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss	(9,575)	(1,332)
Debt Securities, Available for Sale, 12 Months or more, Fair Value	218,077	297,020
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss	(2,594)	(4,710)
Debt Securities, Available for Sale, Fair Value	1,007,523	509,107
Debt Securities, Available-for-sale, Unrealized Loss	(12,169)	(6,042)
Obligations of U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available for Sale, Less than 12 Months, Fair Value	664,219	160,543
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss	(7,733)	(891)
Debt Securities, Available for Sale, 12 Months or more, Fair Value	0	0
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss	0	0
Debt Securities, Available for Sale, Fair Value	664,219	160,543
Debt Securities, Available-for-sale, Unrealized Loss	(7,733)	(891)
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available for Sale, Less than 12 Months, Fair Value	38,529
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss	(1,571)
Debt Securities, Available for Sale, 12 Months or more, Fair Value	0
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss	0
Debt Securities, Available for Sale, Fair Value	38,529
Debt Securities, Available-for-sale, Unrealized Loss	(1,571)
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available for Sale, Less than 12 Months, Fair Value	86,698	51,544
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss	(271)	(441)
Debt Securities, Available for Sale, 12 Months or more, Fair Value	218,077	297,020
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss	(2,594)	(4,710)
Debt Securities, Available for Sale, Fair Value	304,775	348,564
Debt Securities, Available-for-sale, Unrealized Loss	$ (2,865)	$ (5,151)

Investment Securities - Amort_3

Investment Securities - Amortized Cost of Debt Securities Held-to-Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Amortized cost, held to maturity	$ 260,454	$ 284,563
AAA/AA/A
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Amortized cost, held to maturity	260,454	284,563
BBB/BB/B
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Amortized cost, held to maturity	0	0
Obligations of U.S. government agencies \| AAA/AA/A
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Amortized cost, held to maturity	250,178	273,667
Obligations of U.S. government agencies \| BBB/BB/B
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Amortized cost, held to maturity	0	0
Obligations of states and political subdivisions \| AAA/AA/A
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Amortized cost, held to maturity	10,276	10,896
Obligations of states and political subdivisions \| BBB/BB/B
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Amortized cost, held to maturity	$ 0	$ 0

Loans - Summary of Loan Balance

Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 4,966,977	$ 4,763,127
Total principal balance of loans owed, net of charge-offs	5,009,686	4,805,596
Unamortized net deferred loan fees	(20,108)	(16,984)
Discounts to principal balance of loans owed, net of charge-offs	(22,601)	(25,485)
Allowance for loan losses	(85,941)	(91,847)	$ (57,911)	$ (30,616)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	3,108,624	2,951,902
Allowance for loan losses	(50,403)	(53,693)	(29,250)	(11,995)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,041,213	952,108
Allowance for loan losses	(24,604)	(25,148)	(19,592)	(10,084)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	551,077	526,327
Allowance for loan losses	(4,464)	(4,252)	(3,868)	(4,867)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	221,613	284,842
Allowance for loan losses	(5,476)	(7,540)	(4,595)	(3,388)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	39,753	44,164
Allowance for loan losses	(988)	(1,209)	(595)	(261)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	4,697	3,784
Allowance for loan losses	(6)	(5)	(11)	(21)
CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,554,927	1,535,555
Allowance for loan losses	(26,434)	(29,380)	(18,033)	(5,948)
CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	641,216	624,375
Allowance for loan losses	(9,874)	(10,861)	(5,365)	(2,027)
Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	764,884	639,480
Allowance for loan losses	(12,371)	(11,472)	(5,140)	(3,352)
Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	147,597	152,492
Allowance for loan losses	(1,724)	(1,980)	(712)	(668)
SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	636,824	546,592
SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	331,333	327,484
Allowance for loan losses	(11,079)	(11,771)	(11,196)	(6,183)
Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	73,056	78,032
Allowance for loan losses	$ (2,860)	$ (3,260)	$ (2,746)	$ (1,595)

Loans - Narrative (Details)

Loans - Narrative (Details) $ in Thousands	3 Months Ended
Loans - Narrative (Details) $ in Thousands	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)loan
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 4,966,977		$ 4,763,127
Loan balance, before allowance for credit loss and fee	5,009,686		4,805,596
Deferred loan fees	20,108		16,984
Loans, including fees	60,436	$ 56,258
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	551,077		526,327
Payment Protection Program (PPP)
Loans and Leases Receivable Disclosure [Line Items]
Loan balance, before allowance for credit loss and fee	614,826
Payment Protection Program (PPP) \| Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 370,274		$ 333,982
Number of loans (in loans) \| loan	2,484		2,300
Number of loans less than $50,000 (in loans) \| loan	1,303
Allowance for credit loss, balance less than $50,000	$ 26,895
Deferred loan fees	23,585
Deferred loan costs	1,163
Deferred fee accretion	9,430	7,212
Loans, including fees	$ 5,232	$ 0

Allowance for Credit Losses - S

Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 91,847	$ 30,616	$ 30,616
Charge-offs	(226)	(510)	(1,755)
Recoveries	560	892	1,885
Provision (benefit)	(6,240)	8,000	42,188
Ending balance	85,941	57,911	91,847
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	3,400	2,775	2,775
Charge-offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	180	0	625
Ending balance	3,580	2,775	3,400
Credit Loss [Roll Forward]
Beginning balance	95,247	33,391	33,391
Charge-offs	(226)	(510)	(1,755)
Recoveries	560	892	1,885
Provision (benefit)	(6,060)	8,000	42,813
Ending balance	89,521	60,686	95,247
Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		18,913	18,913
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance		0	0
Credit Loss [Roll Forward]
Beginning balance		18,913	18,913
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	53,693	11,995	11,995
Charge-offs	0	0	(182)
Recoveries	3	194	226
Provision (benefit)	(3,293)	5,213	29,806
Ending balance	50,403	29,250	53,693
Commercial real estate \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		11,848	11,848
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	25,148	10,084	10,084
Charge-offs	(193)	(130)	(799)
Recoveries	401	552	1,067
Provision (benefit)	(752)	802	6,512
Ending balance	24,604	19,592	25,148
Consumer \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		8,284	8,284
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,252	4,867	4,867
Charge-offs	(33)	(380)	(774)
Recoveries	136	126	568
Provision (benefit)	109	1,216	1,552
Ending balance	4,464	3,868	4,252
Commercial and industrial \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		(1,961)	(1,961)
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,540	3,388	3,388
Charge-offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	(2,064)	274	3,219
Ending balance	5,476	4,595	7,540
Construction \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		933	933
Agriculture production
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,209	261	261
Charge-offs	0	0	0
Recoveries	20	20	24
Provision (benefit)	(241)	493	1,103
Ending balance	988	595	1,209
Agriculture production \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		(179)	(179)
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5	21	21
Charge-offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	1	2	(4)
Ending balance	6	11	5
Leases \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		(12)	(12)
CRE non-owner occupied \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	29,380	5,948	5,948
Charge-offs	0	0	0
Recoveries	2	189	198
Provision (benefit)	(2,948)	5,195	16,533
Ending balance	26,434	18,033	29,380
CRE non-owner occupied \| Commercial real estate \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		6,701	6,701
CRE owner occupied \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,861	2,027	2,027
Charge-offs	0	0	0
Recoveries	1	5	28
Provision (benefit)	(988)	1,052	6,525
Ending balance	9,874	5,365	10,861
CRE owner occupied \| Commercial real estate \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		2,281	2,281
Multifamily \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,472	3,352	3,352
Charge-offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	899	(493)	5,839
Ending balance	12,371	5,140	11,472
Multifamily \| Commercial real estate \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		2,281	2,281
Farmland \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,980	668	668
Charge-offs	0	0	(182)
Recoveries	0	0	0
Provision (benefit)	(256)	(541)	909
Ending balance	1,724	712	1,980
Farmland \| Commercial real estate \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		585	585
SFR 1-4 1st DT liens \| Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,117	2,306	2,306
Charge-offs	0	0	(13)
Recoveries	10	410	416
Provision (benefit)	538	259	4,733
Ending balance	10,665	5,650	10,117
SFR 1-4 1st DT liens \| Consumer \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		2,675	2,675
SFR HELOCs and junior liens \| Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,771	6,183	6,183
Charge-offs	0	0	(116)
Recoveries	285	48	304
Provision (benefit)	(977)	327	762
Ending balance	11,079	11,196	11,771
SFR HELOCs and junior liens \| Consumer \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		4,638	4,638
Other \| Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,260	1,595	1,595
Charge-offs	(193)	(130)	(670)
Recoveries	106	94	347
Provision (benefit)	(313)	216	1,017
Ending balance	$ 2,860	2,746	3,260
Other \| Consumer \| Impact of CECL Adoption
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		$ 971	$ 971

Allowance for Credit Losses - A

Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Reserve for concentration risk			$ 5,435
Reserves on individually evaluated loans			471
Allowance for credit loss		$ 30,616	85,941	$ 57,911	$ 91,847
Cumulative effect adjustment, decrease in retained earnings		906,570	942,539	866,426	925,114
Threshold for loan analysis			1,000
ASU 2016-13
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit loss	$ 18,913
Reclassification of financing receivable	$ 481
Retained Earnings
Loans and Leases Receivable Disclosure [Line Items]
Cumulative effect adjustment, decrease in retained earnings		367,794	408,211	356,935	$ 381,999
Impact of CECL Adoption
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit loss		18,913
Tax portion of cumulative effect adjustment		5,449
Cumulative effect adjustment, decrease in retained earnings		(12,983)
Impact of CECL Adoption \| Retained Earnings
Loans and Leases Receivable Disclosure [Line Items]
Cumulative effect adjustment, decrease in retained earnings		$ (12,983)
Financial Asset Originated
Loans and Leases Receivable Disclosure [Line Items]
Interest lost on nonaccrual loans			536	431
Interest income on nonaccrual loans			$ 17	$ 47

Allowance for Credit Losses -_2

Allowance for Credit Losses - Schedule Credit Quality Indicators (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	$ 536,620	$ 972,227
Fiscal year before latest fiscal year	847,549	647,339
Two years before latest fiscal year	626,452	525,260
Three years before latest fiscal year	456,616	540,927
Four years before latest fiscal year	508,988	436,909
Prior	1,383,436	1,016,093
Revolving Loans Amortized Cost Basis	584,436	599,620
Revolving Loans Converted to Term	22,880	24,752
Total	4,966,977	4,763,127
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	3,108,624	2,951,902
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,041,213	952,108
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	177,482	356,701
Fiscal year before latest fiscal year	216,547	49,241
Two years before latest fiscal year	45,044	21,214
Three years before latest fiscal year	17,932	14,488
Four years before latest fiscal year	13,518	6,028
Prior	13,790	9,816
Revolving Loans Amortized Cost Basis	65,715	67,664
Revolving Loans Converted to Term	1,049	1,175
Total	551,077	526,327
Construction
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	1,711	69,133
Fiscal year before latest fiscal year	76,063	41,786
Two years before latest fiscal year	44,589	92,191
Three years before latest fiscal year	37,820	51,428
Four years before latest fiscal year	31,649	25,397
Prior	29,781	4,907
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	221,613	284,842
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	262	977
Fiscal year before latest fiscal year	897	2,079
Two years before latest fiscal year	1,959	1,793
Three years before latest fiscal year	1,477	1,838
Four years before latest fiscal year	1,582	718
Prior	1,160	708
Revolving Loans Amortized Cost Basis	32,416	36,051
Revolving Loans Converted to Term	0	0
Total	39,753	44,164
Leases
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	4,697	3,784
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	4,697	3,784
CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	58,047	120,520
Fiscal year before latest fiscal year	130,667	215,354
Two years before latest fiscal year	212,044	168,871
Three years before latest fiscal year	160,881	262,668
Four years before latest fiscal year	265,236	197,443
Prior	651,023	481,764
Revolving Loans Amortized Cost Basis	77,029	88,935
Revolving Loans Converted to Term	0	0
Total	1,554,927	1,535,555
CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	36,465	105,896
Fiscal year before latest fiscal year	104,653	76,677
Two years before latest fiscal year	75,174	55,405
Three years before latest fiscal year	53,937	66,297
Four years before latest fiscal year	65,411	58,802
Prior	283,174	235,790
Revolving Loans Amortized Cost Basis	22,402	25,508
Revolving Loans Converted to Term	0	0
Total	641,216	624,375
Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	121,003	87,087
Fiscal year before latest fiscal year	92,121	123,096
Two years before latest fiscal year	122,525	113,882
Three years before latest fiscal year	118,297	70,715
Four years before latest fiscal year	68,886	92,144
Prior	212,522	124,290
Revolving Loans Amortized Cost Basis	29,530	28,266
Revolving Loans Converted to Term	0	0
Total	764,884	639,480
Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	4,669	17,640
Fiscal year before latest fiscal year	18,083	28,270
Two years before latest fiscal year	25,762	19,148
Three years before latest fiscal year	18,659	14,707
Four years before latest fiscal year	10,259	7,604
Prior	27,486	21,450
Revolving Loans Amortized Cost Basis	42,679	43,673
Revolving Loans Converted to Term	0	0
Total	147,597	152,492
SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	125,704	183,719
Fiscal year before latest fiscal year	186,594	81,007
Two years before latest fiscal year	72,921	38,200
Three years before latest fiscal year	35,107	54,040
Four years before latest fiscal year	48,511	47,417
Prior	161,513	135,164
Revolving Loans Amortized Cost Basis	0	76
Revolving Loans Converted to Term	6,474	6,969
Total	636,824	546,592
SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	700	793
Fiscal year before latest fiscal year	85	0
Two years before latest fiscal year	0	29
Three years before latest fiscal year	28	360
Four years before latest fiscal year	343	300
Prior	1,130	1,032
Revolving Loans Amortized Cost Basis	313,690	308,362
Revolving Loans Converted to Term	15,357	16,608
Total	331,333	327,484
Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	5,880	25,977
Fiscal year before latest fiscal year	21,839	29,829
Two years before latest fiscal year	26,434	14,527
Three years before latest fiscal year	12,478	4,386
Four years before latest fiscal year	3,593	1,056
Prior	1,857	1,172
Revolving Loans Amortized Cost Basis	975	1,085
Revolving Loans Converted to Term	0	0
Total	73,056	78,032
Pass
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	536,620	962,685
Fiscal year before latest fiscal year	838,054	629,730
Two years before latest fiscal year	610,155	507,345
Three years before latest fiscal year	438,804	521,664
Four years before latest fiscal year	483,621	383,401
Prior	1,294,162	970,535
Revolving Loans Amortized Cost Basis	544,841	560,867
Revolving Loans Converted to Term	18,923	20,643
Total	4,765,180	4,556,870
Pass \| Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	177,482	356,701
Fiscal year before latest fiscal year	216,547	48,838
Two years before latest fiscal year	44,666	20,463
Three years before latest fiscal year	17,226	13,151
Four years before latest fiscal year	11,974	5,185
Prior	12,802	9,490
Revolving Loans Amortized Cost Basis	61,969	65,938
Revolving Loans Converted to Term	964	1,085
Total	543,630	520,851
Pass \| Construction
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	1,711	69,133
Fiscal year before latest fiscal year	76,063	41,786
Two years before latest fiscal year	44,589	92,191
Three years before latest fiscal year	37,820	51,082
Four years before latest fiscal year	31,303	20,868
Prior	23,442	2,876
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	214,928	277,936
Pass \| Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	262	977
Fiscal year before latest fiscal year	897	2,079
Two years before latest fiscal year	1,959	1,590
Three years before latest fiscal year	1,288	1,838
Four years before latest fiscal year	1,582	663
Prior	1,108	708
Revolving Loans Amortized Cost Basis	32,416	36,051
Revolving Loans Converted to Term	0	0
Total	39,512	43,906
Pass \| Leases
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	4,697	3,784
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	4,697	3,784
Pass \| CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	58,047	120,520
Fiscal year before latest fiscal year	130,667	207,899
Two years before latest fiscal year	205,818	155,730
Three years before latest fiscal year	147,766	256,677
Four years before latest fiscal year	252,414	179,523
Prior	620,082	460,644
Revolving Loans Amortized Cost Basis	65,028	76,730
Revolving Loans Converted to Term	0	0
Total	1,479,822	1,457,723
Pass \| CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	36,465	105,896
Fiscal year before latest fiscal year	104,653	75,144
Two years before latest fiscal year	73,669	53,816
Three years before latest fiscal year	52,367	58,371
Four years before latest fiscal year	57,770	54,541
Prior	270,655	227,828
Revolving Loans Amortized Cost Basis	22,402	25,508
Revolving Loans Converted to Term	0	0
Total	617,981	601,104
Pass \| Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	121,003	77,646
Fiscal year before latest fiscal year	82,738	118,725
Two years before latest fiscal year	118,173	113,882
Three years before latest fiscal year	118,297	70,112
Four years before latest fiscal year	68,886	67,457
Prior	187,843	123,518
Revolving Loans Amortized Cost Basis	20,771	19,007
Revolving Loans Converted to Term	0	0
Total	717,711	590,347
Pass \| Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	4,669	17,640
Fiscal year before latest fiscal year	18,083	25,003
Two years before latest fiscal year	22,496	19,148
Three years before latest fiscal year	18,659	12,834
Four years before latest fiscal year	8,467	7,377
Prior	23,026	17,129
Revolving Loans Amortized Cost Basis	38,076	39,411
Revolving Loans Converted to Term	0	0
Total	133,476	138,542
Pass \| SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	125,704	183,719
Fiscal year before latest fiscal year	186,594	80,717
Two years before latest fiscal year	72,632	36,342
Three years before latest fiscal year	33,274	53,001
Four years before latest fiscal year	47,410	46,467
Prior	152,614	126,465
Revolving Loans Amortized Cost Basis	0	76
Revolving Loans Converted to Term	5,039	5,507
Total	623,267	532,294
Pass \| SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	700	793
Fiscal year before latest fiscal year	85	0
Two years before latest fiscal year	0	13
Three years before latest fiscal year	12	360
Four years before latest fiscal year	343	300
Prior	958	910
Revolving Loans Amortized Cost Basis	303,290	297,160
Revolving Loans Converted to Term	12,920	14,051
Total	318,308	313,587
Pass \| Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	5,880	25,876
Fiscal year before latest fiscal year	21,727	29,539
Two years before latest fiscal year	26,153	14,170
Three years before latest fiscal year	12,095	4,238
Four years before latest fiscal year	3,472	1,020
Prior	1,632	967
Revolving Loans Amortized Cost Basis	889	986
Revolving Loans Converted to Term	0	0
Total	71,848	76,796
Special Mention
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	9,484
Fiscal year before latest fiscal year	9,438	10,622
Two years before latest fiscal year	6,813	13,728
Three years before latest fiscal year	13,709	15,457
Four years before latest fiscal year	21,584	43,750
Prior	60,963	33,893
Revolving Loans Amortized Cost Basis	29,302	28,523
Revolving Loans Converted to Term	1,868	1,734
Total	143,677	157,191
Special Mention \| Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	102
Two years before latest fiscal year	96	698
Three years before latest fiscal year	602	195
Four years before latest fiscal year	169	20
Prior	176	178
Revolving Loans Amortized Cost Basis	2,558	207
Revolving Loans Converted to Term	10	11
Total	3,611	1,411
Special Mention \| Construction
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	346
Four years before latest fiscal year	346	0
Prior	1,756	1,780
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	2,102	2,126
Special Mention \| Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	203
Three years before latest fiscal year	189	0
Four years before latest fiscal year	0	49
Prior	47	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	236	252
Special Mention \| Leases
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Special Mention \| CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	7,455
Two years before latest fiscal year	6,226	11,692
Three years before latest fiscal year	11,683	5,407
Four years before latest fiscal year	12,245	15,773
Prior	19,053	18,832
Revolving Loans Amortized Cost Basis	12,001	12,205
Revolving Loans Converted to Term	0	0
Total	61,208	71,364
Special Mention \| CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	288
Three years before latest fiscal year	288	7,451
Four years before latest fiscal year	7,171	2,955
Prior	8,916	6,140
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	16,375	16,834
Special Mention \| Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	9,441
Fiscal year before latest fiscal year	9,383	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	603
Four years before latest fiscal year	0	24,687
Prior	24,679	772
Revolving Loans Amortized Cost Basis	8,759	9,259
Revolving Loans Converted to Term	0	0
Total	42,821	44,762
Special Mention \| Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	2,567
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	1,271
Four years before latest fiscal year	1,196	227
Prior	3,316	3,107
Revolving Loans Amortized Cost Basis	1,653	2,258
Revolving Loans Converted to Term	0	0
Total	6,165	9,430
Special Mention \| SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	290
Two years before latest fiscal year	289	684
Three years before latest fiscal year	682	110
Four years before latest fiscal year	421	15
Prior	2,803	2,936
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	1,073	934
Total	5,268	4,969
Special Mention \| SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	16
Three years before latest fiscal year	16	0
Four years before latest fiscal year	0	0
Prior	139	83
Revolving Loans Amortized Cost Basis	4,254	4,504
Revolving Loans Converted to Term	785	789
Total	5,194	5,392
Special Mention \| Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	43
Fiscal year before latest fiscal year	55	208
Two years before latest fiscal year	202	147
Three years before latest fiscal year	249	74
Four years before latest fiscal year	36	24
Prior	78	65
Revolving Loans Amortized Cost Basis	77	90
Revolving Loans Converted to Term	0	0
Total	697	651
Substandard
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	58
Fiscal year before latest fiscal year	57	6,987
Two years before latest fiscal year	9,484	4,187
Three years before latest fiscal year	4,103	3,806
Four years before latest fiscal year	3,783	9,758
Prior	28,311	11,665
Revolving Loans Amortized Cost Basis	10,293	10,230
Revolving Loans Converted to Term	2,089	2,375
Total	58,120	49,066
Substandard \| Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	301
Two years before latest fiscal year	282	53
Three years before latest fiscal year	104	1,142
Four years before latest fiscal year	1,375	823
Prior	812	148
Revolving Loans Amortized Cost Basis	1,188	1,519
Revolving Loans Converted to Term	75	79
Total	3,836	4,065
Substandard \| Construction
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	4,529
Prior	4,583	251
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	4,583	4,780
Substandard \| Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	6
Prior	5	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	5	6
Substandard \| Leases
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Substandard \| CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	1,449
Three years before latest fiscal year	1,432	584
Four years before latest fiscal year	577	2,147
Prior	11,888	2,288
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	13,897	6,468
Substandard \| CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	1,533
Two years before latest fiscal year	1,505	1,301
Three years before latest fiscal year	1,282	475
Four years before latest fiscal year	470	1,306
Prior	3,603	1,822
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	6,860	6,437
Substandard \| Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	4,371
Two years before latest fiscal year	4,352	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	4,352	4,371
Substandard \| Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	700
Two years before latest fiscal year	3,266	0
Three years before latest fiscal year	0	602
Four years before latest fiscal year	596	0
Prior	1,144	1,214
Revolving Loans Amortized Cost Basis	2,950	2,004
Revolving Loans Converted to Term	0	0
Total	7,956	4,520
Substandard \| SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	1,174
Three years before latest fiscal year	1,151	929
Four years before latest fiscal year	680	935
Prior	6,096	5,763
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	362	528
Total	8,289	9,329
Substandard \| SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	33	39
Revolving Loans Amortized Cost Basis	6,146	6,698
Revolving Loans Converted to Term	1,652	1,768
Total	7,831	8,505
Substandard \| Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	58
Fiscal year before latest fiscal year	57	82
Two years before latest fiscal year	79	210
Three years before latest fiscal year	134	74
Four years before latest fiscal year	85	12
Prior	147	140
Revolving Loans Amortized Cost Basis	9	9
Revolving Loans Converted to Term	0	0
Total	511	585
Doubtful/Loss
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| Construction
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| Leases
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Doubtful/Loss \| Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Current fiscal year	0	0
Fiscal year before latest fiscal year	0	0
Two years before latest fiscal year	0	0
Three years before latest fiscal year	0	0
Four years before latest fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	$ 0	$ 0

Allowance for Credit Losses -_3

Allowance for Credit Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total	$ 4,966,977	$ 4,763,127
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	3,108,624	2,951,902
Consumer
Financing Receivable, Past Due [Line Items]
Total	1,041,213	952,108
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	551,077	526,327
Construction
Financing Receivable, Past Due [Line Items]
Total	221,613	284,842
Agriculture production
Financing Receivable, Past Due [Line Items]
Total	39,753	44,164
Leases
Financing Receivable, Past Due [Line Items]
Total	4,697	3,784
CRE non-owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	1,554,927	1,535,555
CRE owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	641,216	624,375
Multifamily \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	764,884	639,480
Farmland \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	147,597	152,492
SFR 1-4 1st DT liens \| Consumer
Financing Receivable, Past Due [Line Items]
Total	636,824	546,592
SFR HELOCs and junior liens \| Consumer
Financing Receivable, Past Due [Line Items]
Total	331,333	327,484
Other \| Consumer
Financing Receivable, Past Due [Line Items]
Total	73,056	78,032
Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	10,550	6,767
Current	4,956,427	4,756,360
Total	4,966,977	4,763,127
Financial Asset Originated \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	6,113	2,629
Current	3,102,511	2,949,273
Total	3,108,624	2,951,902
Financial Asset Originated \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	3,012	3,452
Current	1,038,201	948,656
Total	1,041,213	952,108
Financial Asset Originated \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	1,091	686
Current	549,986	525,641
Total	551,077	526,327
Financial Asset Originated \| Construction
Financing Receivable, Past Due [Line Items]
Past due	295	0
Current	221,318	284,842
Total	221,613	284,842
Financial Asset Originated \| Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	39	0
Current	39,714	44,164
Total	39,753	44,164
Financial Asset Originated \| Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
Current	4,697	3,784
Total	4,697	3,784
Financial Asset Originated \| CRE non-owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	4,519	539
Current	1,550,408	1,535,016
Total	1,554,927	1,535,555
Financial Asset Originated \| CRE owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	747	1,121
Current	640,469	623,254
Total	641,216	624,375
Financial Asset Originated \| Multifamily \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	0
Current	764,884	639,480
Total	764,884	639,480
Financial Asset Originated \| Farmland \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	847	969
Current	146,750	151,523
Total	147,597	152,492
Financial Asset Originated \| SFR 1-4 1st DT liens \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	881	997
Current	635,943	545,595
Total	636,824	546,592
Financial Asset Originated \| SFR HELOCs and junior liens \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	2,021	2,301
Current	329,312	325,183
Total	331,333	327,484
Financial Asset Originated \| Other \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	110	154
Current	72,946	77,878
Total	73,056	78,032
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	824	1,974
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	213	1,323
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	125	496
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	152	155
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| Construction
Financing Receivable, Past Due [Line Items]
Past due	295	0
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	39	0
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| CRE non-owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	55	127
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| CRE owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	158	297
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| Multifamily \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| Farmland \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	899
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| SFR 1-4 1st DT liens \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	0	37
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| SFR HELOCs and junior liens \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	59	418
Financial Asset, 30 to 59 Days Past Due \| Financial Asset Originated \| Other \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	66	41
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	1,025	824
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	354	173
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	503	225
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	168	426
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| Construction
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| CRE non-owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	354	173
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| CRE owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| Multifamily \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| Farmland \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| SFR 1-4 1st DT liens \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| SFR HELOCs and junior liens \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	490	212
Financial Asset, 60 to 89 Days Past Due \| Financial Asset Originated \| Other \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	13	13
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	8,701	3,969
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	5,546	1,133
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	2,384	2,731
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	771	105
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| Construction
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| CRE non-owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	4,110	239
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| CRE owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	589	824
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| Multifamily \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| Farmland \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	847	70
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| SFR 1-4 1st DT liens \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	881	960
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| SFR HELOCs and junior liens \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	1,472	1,671
Financial Asset, Equal to or Greater than 90 Days Past Due \| Financial Asset Originated \| Other \| Consumer
Financing Receivable, Past Due [Line Items]
Past due	$ 31	$ 100

Allowance for Credit Losses -_4

Allowance for Credit Losses - Schedule of Non Accrual Loans (Detail) - Financial Asset Originated - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	$ 24,138	$ 21,703
Non accrual, no allowance including guaranteed loans	24,952	22,390
Non accrual including guaranteed loans	28,696	26,864
Total non accrual	27,882	26,053
Loans Insured or Guaranteed by US Government Authorities
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	814	687
Total non accrual	814	811
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	245	0
Commercial real estate
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	11,264	7,689
Total non accrual	12,193	8,709
Commercial real estate \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
Consumer
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	9,092	9,498
Total non accrual	10,241	11,408
Consumer \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	108	652
Total non accrual	1,774	2,183
Commercial and industrial \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	245	0
Construction
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	4,483	4,546
Total non accrual	4,483	4,546
Construction \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
Agriculture production
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	5	5
Total non accrual	5	18
Agriculture production \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
Leases
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	0	0
Total non accrual	0	0
Leases \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
CRE non-owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	7,000	3,110
Total non accrual	7,000	3,110
CRE non-owner occupied \| Commercial real estate \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
CRE owner occupied \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	2,833	3,111
Total non accrual	3,762	4,061
CRE owner occupied \| Commercial real estate \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
Multifamily \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	0	0
Total non accrual	0	0
Multifamily \| Commercial real estate \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
Farmland \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	1,431	1,468
Total non accrual	1,431	1,538
Farmland \| Commercial real estate \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
SFR 1-4 1st DT liens \| Consumer
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	4,853	4,950
Total non accrual	4,996	5,093
SFR 1-4 1st DT liens \| Consumer \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
SFR HELOCs and junior liens \| Consumer
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	4,187	4,480
Total non accrual	5,142	6,148
SFR HELOCs and junior liens \| Consumer \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	0	0
Other \| Consumer
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	52	68
Total non accrual	103	167
Other \| Consumer \| Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due 90 days or more and still accruing	$ 0	$ 0

Allowance for Credit Losses -_5

Allowance for Credit Losses - Amortized Cost Basis of Collateral Dependent Loans, By Class of Loan (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 4,966,977	$ 4,763,127
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,411	3,241
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,354	1,611
Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,640	1,668
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,698	334
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,431	1,538
SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,361	11,470
SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,471	2,839
Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	25	97
A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,288	1,186
Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	219	80
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	27,898	24,064
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,108,624	2,951,902
Commercial real estate \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,411	3,241
Commercial real estate \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,354	1,611
Commercial real estate \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,640	1,668
Commercial real estate \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,357	0
Commercial real estate \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial real estate \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,431	1,538
Commercial real estate \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial real estate \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial real estate \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial real estate \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial real estate \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial real estate \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	12,193	8,058
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,041,213	952,108
Consumer \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	69	42
Consumer \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,878	6,923
Consumer \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,471	2,839
Consumer \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	25	97
Consumer \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,443	9,901
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	551,077	526,327
Commercial and industrial \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial and industrial \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial and industrial \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial and industrial \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	272	292
Commercial and industrial \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial and industrial \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial and industrial \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial and industrial \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial and industrial \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial and industrial \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,288	1,173
Commercial and industrial \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	214	75
Commercial and industrial \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,774	1,540
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	221,613	284,842
Construction \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Construction \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Construction \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Construction \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Construction \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Construction \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Construction \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,483	4,547
Construction \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Construction \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Construction \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Construction \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Construction \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,483	4,547
Agriculture production
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	39,753	44,164
Agriculture production \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agriculture production \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agriculture production \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agriculture production \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agriculture production \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agriculture production \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agriculture production \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agriculture production \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agriculture production \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agriculture production \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	13
Agriculture production \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5	5
Agriculture production \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5	18
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,697	3,784
Leases \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE non-owner occupied \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,554,927	1,535,555
CRE non-owner occupied \| Commercial real estate \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,630	2,445
CRE non-owner occupied \| Commercial real estate \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	427	435
CRE non-owner occupied \| Commercial real estate \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE non-owner occupied \| Commercial real estate \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,943	0
CRE non-owner occupied \| Commercial real estate \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE non-owner occupied \| Commercial real estate \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE non-owner occupied \| Commercial real estate \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE non-owner occupied \| Commercial real estate \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE non-owner occupied \| Commercial real estate \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE non-owner occupied \| Commercial real estate \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE non-owner occupied \| Commercial real estate \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE non-owner occupied \| Commercial real estate \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7,000	2,880
CRE owner occupied \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	641,216	624,375
CRE owner occupied \| Commercial real estate \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	781	796
CRE owner occupied \| Commercial real estate \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	927	1,176
CRE owner occupied \| Commercial real estate \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,640	1,668
CRE owner occupied \| Commercial real estate \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	414	0
CRE owner occupied \| Commercial real estate \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE owner occupied \| Commercial real estate \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE owner occupied \| Commercial real estate \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE owner occupied \| Commercial real estate \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE owner occupied \| Commercial real estate \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE owner occupied \| Commercial real estate \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE owner occupied \| Commercial real estate \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
CRE owner occupied \| Commercial real estate \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,762	3,640
Multifamily \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	764,884	639,480
Multifamily \| Commercial real estate \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Multifamily \| Commercial real estate \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	147,597	152,492
Farmland \| Commercial real estate \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,431	1,538
Farmland \| Commercial real estate \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Farmland \| Commercial real estate \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,431	1,538
SFR 1-4 1st DT liens \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	636,824	546,592
SFR 1-4 1st DT liens \| Consumer \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR 1-4 1st DT liens \| Consumer \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR 1-4 1st DT liens \| Consumer \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR 1-4 1st DT liens \| Consumer \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR 1-4 1st DT liens \| Consumer \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR 1-4 1st DT liens \| Consumer \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR 1-4 1st DT liens \| Consumer \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,996	5,068
SFR 1-4 1st DT liens \| Consumer \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR 1-4 1st DT liens \| Consumer \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR 1-4 1st DT liens \| Consumer \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR 1-4 1st DT liens \| Consumer \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR 1-4 1st DT liens \| Consumer \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,996	5,068
SFR HELOCs and junior liens \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	331,333	327,484
SFR HELOCs and junior liens \| Consumer \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR HELOCs and junior liens \| Consumer \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR HELOCs and junior liens \| Consumer \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR HELOCs and junior liens \| Consumer \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR HELOCs and junior liens \| Consumer \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR HELOCs and junior liens \| Consumer \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR HELOCs and junior liens \| Consumer \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,882	1,855
SFR HELOCs and junior liens \| Consumer \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,471	2,839
SFR HELOCs and junior liens \| Consumer \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR HELOCs and junior liens \| Consumer \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR HELOCs and junior liens \| Consumer \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
SFR HELOCs and junior liens \| Consumer \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,353	4,694
Other \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	73,056	78,032
Other \| Consumer \| Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Other \| Consumer \| Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Other \| Consumer \| Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Other \| Consumer \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	69	42
Other \| Consumer \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Other \| Consumer \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Other \| Consumer \| SFR -1st Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Other \| Consumer \| SFR -2nd Deed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Other \| Consumer \| Automobile/Truck
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	25	97
Other \| Consumer \| A/R and Inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Other \| Consumer \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Other \| Consumer \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 94	$ 139

Allowance for Credit Losses - T

Allowance for Credit Losses - Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)investmentSecurity	Mar. 31, 2020USD ($)investmentSecurity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	5,000	6,000
Pre-mod outstanding principal balance	$ 1,373	$ 680
Post-mod outstanding principal balance	1,366	738
Financial impact due to TDR taken as additional provision	$ 1,366	$ 21
Number that defaulted during the period (in investment securities) \| investmentSecurity	4,000	1,000
Recorded investment of TDRs that defaulted during the period	$ 1,094	$ 302
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	2,000	3,000
Pre-mod outstanding principal balance	$ 1,057	$ 487
Post-mod outstanding principal balance	1,056	549
Financial impact due to TDR taken as additional provision	$ 1,056	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	3,000	0
Recorded investment of TDRs that defaulted during the period	$ 847	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	0	2,000
Pre-mod outstanding principal balance	$ 0	$ 172
Post-mod outstanding principal balance	0	169
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	0	1,000
Recorded investment of TDRs that defaulted during the period	$ 0	$ 302
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	3,000	1,000
Pre-mod outstanding principal balance	$ 316	$ 21
Post-mod outstanding principal balance	310	20
Financial impact due to TDR taken as additional provision	$ 310	$ 21
Number that defaulted during the period (in investment securities) \| investmentSecurity	1,000	0
Recorded investment of TDRs that defaulted during the period	$ 247	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	0	0
Pre-mod outstanding principal balance	$ 0	$ 0
Post-mod outstanding principal balance	0	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	0	0
Recorded investment of TDRs that defaulted during the period	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Agriculture production
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	0	0
Pre-mod outstanding principal balance	$ 0	$ 0
Post-mod outstanding principal balance	0	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	0	0
Recorded investment of TDRs that defaulted during the period	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Leases
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	0	0
Pre-mod outstanding principal balance	$ 0	$ 0
Post-mod outstanding principal balance	0	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	0	0
Recorded investment of TDRs that defaulted during the period	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
CRE non-owner occupied \| Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	1,000	1,000
Pre-mod outstanding principal balance	$ 317	$ 257
Post-mod outstanding principal balance	314	251
Financial impact due to TDR taken as additional provision	$ 314	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	0	0
Recorded investment of TDRs that defaulted during the period	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
CRE owner occupied \| Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	1,000	0
Pre-mod outstanding principal balance	$ 740	$ 0
Post-mod outstanding principal balance	742	0
Financial impact due to TDR taken as additional provision	$ 742	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	0	0
Recorded investment of TDRs that defaulted during the period	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Multifamily \| Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	0	0
Pre-mod outstanding principal balance	$ 0	$ 0
Post-mod outstanding principal balance	0	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	0	0
Recorded investment of TDRs that defaulted during the period	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Farmland \| Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	0	2,000
Pre-mod outstanding principal balance	$ 0	$ 230
Post-mod outstanding principal balance	0	298
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	3,000	0
Recorded investment of TDRs that defaulted during the period	$ 847	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
SFR 1-4 1st DT liens \| Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	0	0
Pre-mod outstanding principal balance	$ 0	$ 0
Post-mod outstanding principal balance	0	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	0	1,000
Recorded investment of TDRs that defaulted during the period	$ 0	$ 302
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
SFR HELOCs and junior liens \| Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	0	2,000
Pre-mod outstanding principal balance	$ 0	$ 172
Post-mod outstanding principal balance	0	169
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	0	0
Recorded investment of TDRs that defaulted during the period	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Other \| Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) \| investmentSecurity	0	0
Pre-mod outstanding principal balance	$ 0	$ 0
Post-mod outstanding principal balance	0	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) \| investmentSecurity	0	0
Recorded investment of TDRs that defaulted during the period	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0

Leases - Additional Information

Leases - Additional Information (Detail)	3 Months Ended
Leases - Additional Information (Detail)	Mar. 31, 2021renewalOption
Leases [Abstract]
Number of lease renewal options (in renewal options)	1

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease cost	$ 1,258	$ 1,294
Short-term lease cost	61	63
Variable lease cost	(2)	6
Sublease income	(13)	(34)
Total lease cost	$ 1,304	$ 1,329

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related To Leases (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating cash flows for operating leases	$ 1,204	$ 1,237
ROUA obtained in exchange for operating lease liabilities	$ 1,308	$ 3,393

Leases - Weighted Average Opera

Leases - Weighted Average Operating Lease Term And Discount Rate (Detail)	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Weighted-average remaining lease term (years)	9 years 9 months 18 days	10 years 3 months 18 days
Weighted-average discount rate	3.03%	3.17%

Leases - Future Minimum Rental

Leases - Future Minimum Rental Payments For Operating Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
2021	$ 3,505
2022	4,320
2023	3,649
2024	3,377
2025	2,916
Thereafter	14,933
Total	32,700
Discount for present value of expected cash flows	(4,920)
Lease liability	$ 27,780	$ 27,973

Deposits - Summary of Balances

Deposits - Summary of Balances of Deposits (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deposits [Abstract]
Noninterest-bearing demand	$ 2,766,510	$ 2,581,517
Interest-bearing demand	1,465,915	1,414,908
Savings	2,302,927	2,164,942
Time certificates, $250,000 or more	64,509	73,147
Other time certificates	263,539	271,420
Total deposits	$ 6,863,400	$ 6,505,934

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Deposits [Line Items]
Overdrawn deposit balances classified as consumer loans	$ 813	$ 985
California
Schedule Of Deposits [Line Items]
Certificate of deposits, included in time certificates, over $250,000	$ 10,000	$ 10,000

Commitments and Contingencies -

Commitments and Contingencies - Summary of Bank's Commitments and Contingent Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
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	231,697	227,876
Real estate mortgage loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	231,509	202,306
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	14,543	15,056
Commercial Loan
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	473,971	462,422
Consumer loans
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	539,670	534,223
Deposit account overdraft privilege
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 122,965	$ 110,813

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Feb. 25, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Cash dividends received	$ 7,772,000	$ 26,754,000
Repurchase of common stock	10,000	17,295,000
Market value of shares repurchased under equity compensation plans	$ 2,000	$ 148,000
Employee Stock
Class of Stock [Line Items]
Company's common stock in lieu of cash to exercise options to purchase shares (in shares)	0	4,668
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)	70	133
2021 Stock Repurchase Plan
Class of Stock [Line Items]
Repurchase of common stock (in shares)			2,000,000
Stock repurchase program, percentage of common stock			6.70%
Repurchase of common stock (in shares)	0
2019 Stock Repurchase Plan
Class of Stock [Line Items]
Repurchase of common stock (in shares)	223
Repurchase of common stock	$ 8,260
Cumulative number of shares repurchased (in shares)				858,717
Common Stock
Class of Stock [Line Items]
Repurchase of common stock (in shares)	293	558,670
Repurchase of common stock	$ 5,000	$ 9,962,000
Market value of shares repurchased under equity compensation plans	$ 2,500	$ 153,000

Stock Options and Other Equit_3

Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Apr. 16, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Weighted-average remaining contractual term (in years)	1 year 2 months 12 days
Number of units released (in shares)	0
Number of units increased (in shares)	122,423
Restricted Stock Units (RSUs) \| Service Condition Vesting RSUs
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
RSUs granted (in shares)	0
Number of units outstanding expected to vest (in shares)	100,057		99,809
Pre-tax compensation costs	$ 2,058
Number of units released (in shares)	201
Restricted Stock Units (RSUs) \| Market Plus Service Condition Vesting RSUs
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
RSUs granted (in shares)	0
Number of units outstanding expected to vest (in shares)	81,615		81,615
Weighted-average remaining contractual term (in years)	1 year 7 months 6 days
Pre-tax compensation costs	$ 1,096
Number of units released (in shares)	0
2019 Plan
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Aggregate number of shares of TriCo's common stock issued (in shares)				1,500,000
RSUs granted (in shares)	0	0

Stock Options and Other Equit_4

Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail)	3 Months Ended
	Mar. 31, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at December 31, 2020 (in shares) \| shares	128,500
Options granted (in shares) \| shares	0
Options exercised (in shares) \| shares	0
Options forfeited (in shares) \| shares	0
Options outstanding at March 31, 2021 (in shares) \| shares	128,500
Option Price per Share
Share based compensation arrangements by share based payment award options outstanding option price per share of options granted (in USD per share)	$ 0
Share based compensation arrangements by share based payment award options outstanding option price per share of options forfeited (in USD per share)	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price at December 31, 2020 (in USD per share)	17.72
Weighted Average Exercise Price of Options Granted (in USD per share)	0
Weighted Average Exercise Price of Options Exercised (in USD per share)	0
Weighted Average Exercise Price of Options Forfeited (in USD per share)	0
Weighted Average Exercise Price at March 31, 2021 (in USD per share)	17.72
Minimum
Option Price per Share
Options outstanding, option price per share, beginning balance (in USD per share)	14.54
Share based compensation arrangements by share based payment award options outstanding option price per share of options exercised (in USD per share)	0
Options outstanding, option price per share, ending balance (in USD per share)	14.54
Maximum
Option Price per Share
Options outstanding, option price per share, beginning balance (in USD per share)	23.21
Share based compensation arrangements by share based payment award options outstanding option price per share of options exercised (in USD per share)	0
Options outstanding, option price per share, ending balance (in USD per share)	$ 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	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of options (in shares)	128,500	128,500
Weighted average exercise price (in USD per share)	$ 17.72	$ 17.72
Intrinsic value (in thousands)	$ 3,810
Weighted average remaining contractual term (in years)	1 year 8 months 12 days
Currently Exercisable
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of options (in shares)	128,500
Weighted average exercise price (in USD per share)	$ 17.72
Intrinsic value (in thousands)	$ 3,810
Weighted average remaining contractual term (in years)	1 year 8 months 12 days
Currently Not Exercisable
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of options (in shares)	0
Weighted average exercise price (in USD per share)	$ 0
Intrinsic value (in thousands)	$ 0

Stock Options and Other Equit_6

Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail)	3 Months Ended
	Mar. 31, 2021shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
RSUs released (in shares)	0
Restricted Stock Units (RSUs) \| Service Condition Vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at December 31, 2020 (in shares)	99,809
RSUs granted (in shares)	0
RSUs added through dividend and performance credits (in shares)	504
RSUs released (in shares)	(201)
RSUs forfeited/expired (in shares)	(55)
Outstanding at March 31, 2021 (in shares)	100,057
Restricted Stock Units (RSUs) \| Market Plus Service Condition Vesting RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at December 31, 2020 (in shares)	81,615
RSUs granted (in shares)	0
RSUs added through dividend and performance credits (in shares)	0
RSUs released (in shares)	0
RSUs forfeited/expired (in shares)	0
Outstanding at March 31, 2021 (in shares)	81,615

Non-interest Income and Expen_3

Non-interest Income and Expense - Components of Non-Interest Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	$ 10,476	$ 9,126
Increase in cash value of life insurance	673	720
Asset management and commission income	834	916
Gain on sale of loans	3,247	891
Lease brokerage income	110	193
Sale of customer checks	119	124
Gain on sale of investment securities	0	0
(Loss) gain on marketable equity securities	(53)	47
Other	704	(197)
Total other non-interest income	5,634	2,694
Total non-interest income	16,110	11,820
ATM and interchange fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	5,861	5,111
Service charges on deposit accounts
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	3,269	4,046
Other service fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	871	758
Mortgage banking service fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	463	469
Change in value of mortgage servicing rights
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	$ 12	$ (1,258)

Non-interest Income and Expen_4

Non-interest Income and Expense - Components of Non Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income and Expenses [Abstract]
Base salaries, net of deferred loan origination costs	$ 15,511	$ 17,623
Incentive compensation	3,580	3,101
Benefits and other compensation costs	6,239	6,548
Total salaries and benefits expense	25,330	27,272
Occupancy	3,726	3,875
Data processing and software	3,202	3,367
Equipment	1,517	1,512
Intangible amortization	1,431	1,431
Advertising	380	665
ATM and POS network charges	1,246	1,373
Professional fees	594	703
Telecommunications	581	725
Regulatory assessments and insurance	612	95
Postage	198	290
Operational losses	209	221
Courier service	294	331
Gain on sale of foreclosed assets	51	41
Other miscellaneous expense	2,349	2,930
Total other non-interest expense	16,288	17,477
Total non-interest expense	$ 41,618	$ 44,749

Earnings Per Share - Computatio

Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 33,649	$ 16,121
Average number of common shares outstanding (in shares)	29,727	30,395
Effect of dilutive stock options and restricted stock (in shares)	178	128
Average number of common shares outstanding used to calculate diluted earnings per share (in shares)	29,905	30,523
Options excluded from diluted earnings per share because of their antidilutive effect (in shares)	0	0

Comprehensive Income (Loss) - C

Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Unrealized holding losses on available for sale securities before reclassifications	$ (12,337)	$ (29,561)
Realized gain on debt securities	0	0
Unrealized holding losses on available for sale securities after reclassifications	(12,337)	(29,561)
Tax effect	3,647	8,739
Unrealized holding losses on available for sale securities, net of tax	(8,690)	(20,822)
Change in unfunded status of the supplemental retirement plans before reclassifications	(49)	448
Amounts reclassified out of AOCI:
Amortization of prior service cost	(14)	(14)
Amortization of actuarial losses	63	478
Total amounts reclassified out of accumulated other comprehensive income	49	464
Change in unfunded status of the supplemental retirement plans after reclassifications	0	912
Tax effect	0	0
Change in unfunded status of the supplemental retirement plans, net of tax	0	912
Change in joint beneficiary agreement liability before reclassifications	(629)	0
Tax effect	0	0
Change in joint beneficiary agreement liability before reclassifications, net of tax	(629)	0
Other comprehensive income (loss)	$ (9,319)	$ (19,910)

Comprehensive Income (Loss) -_2

Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax	$ 2,961	$ 12,280
Net unrealized gain on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax	6,846	19,183
Accumulated other comprehensive income, tax effect	(2,024)	(5,671)
Accumulated other comprehensive income, net of tax	4,822	13,512
Unfunded status of the supplemental retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax	(1,294)	(1,294)
Accumulated other comprehensive income, tax effect	382	382
Accumulated other comprehensive income, net of tax	(912)	(912)
Joint beneficiary agreement liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax	(949)	(320)
Accumulated other comprehensive income, tax effect	0	0
Accumulated other comprehensive income, net of tax	$ (949)	$ (320)

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail)	3 Months Ended
Fair Value Measurement - Additional Information (Detail)	Mar. 31, 2021USD ($)investmentSecurity
Fair Value Disclosures [Abstract]
Number of investment securities classified as level 3 (in investment securities) \| investmentSecurity	0
Carrying value of loans fully charged-off \| $	$ 0

Fair Value Measurement - Record

Fair Value Measurement - Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value Measurements on Recurring Basis - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 1,694,678	$ 1,428,649
Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,971	3,025
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	1,032,934	812,374
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	140,384	129,095
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,534	2,544
Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	506,253	470,251
Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	3,995	6,268
Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	5,607	5,092
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,971	3,025
Level 1 \| Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,971	3,025
Level 1 \| 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	0	0
Level 1 \| 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	0	0
Level 1 \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Level 1 \| Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Level 1 \| Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Level 1 \| Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	1,686,100	1,420,532
Level 2 \| Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
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	1,032,934	812,374
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	140,384	129,095
Level 2 \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,534	2,544
Level 2 \| Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	506,253	470,251
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	3,995	6,268
Level 2 \| Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	5,607	5,092
Level 3 \| Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Level 3 \| 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	0	0
Level 3 \| 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	0	0
Level 3 \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Level 3 \| Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Level 3 \| Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Level 3 \| Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 5,607	$ 5,092

Fair Value Measurement - Reconc

Fair Value Measurement - Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis (Detail) - Mortgage servicing rights - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 5,092	$ 6,200
Transfers into (out of) Level 3	0	0
Change Included in Earnings	12	(1,258)
Issuances	503	226
Ending Balance	$ 5,607	$ 5,168

Fair Value Measurement - Quanti

Fair Value Measurement - Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) - Mortgage servicing rights $ in Thousands	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgages servicing rights, fair value	$ 5,607	$ 5,092
Minimum \| Valuation Technique, Discounted Cash Flow \| Measurement Input, Constant Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.11	0.14
Minimum \| Valuation Technique, Discounted Cash Flow \| Measurement Input, Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.10	0.10
Maximum \| Valuation Technique, Discounted Cash Flow \| Measurement Input, Constant Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.24	0.200
Maximum \| Valuation Technique, Discounted Cash Flow \| Measurement Input, Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.14	0.14
Weighted Average \| Valuation Technique, Discounted Cash Flow \| Measurement Input, Constant Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.142	0.176
Weighted Average \| Valuation Technique, Discounted Cash Flow \| Measurement Input, Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.12	0.12

Fair Value Measurement - Assets

Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Foreclosed assets (Residential real estate)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 214		$ 979
Individually evaluated loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	4,557		1,424
Fair Value Nonrecurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	4,771		2,403
Total Gains/(Losses)	(2,741)		(1,334)
Fair Value Nonrecurring Basis \| Individually evaluated loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	4,557	$ 105	1,424
Total Gains/(Losses)	(2,710)	(107)	(1,489)
Fair Value Nonrecurring Basis \| Foreclosed Assets \| Foreclosed assets (Residential real estate)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	214		979
Total Gains/(Losses)	(31)		155
Fair Value Nonrecurring Basis \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0		0
Fair Value Nonrecurring Basis \| Level 1 \| Individually evaluated loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0	0
Fair Value Nonrecurring Basis \| Level 1 \| Foreclosed Assets \| Foreclosed assets (Residential real estate)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0		0
Fair Value Nonrecurring Basis \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0		0
Fair Value Nonrecurring Basis \| Level 2 \| Individually evaluated loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0	0
Fair Value Nonrecurring Basis \| Level 2 \| Foreclosed Assets \| Foreclosed assets (Residential real estate)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0		0
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	4,771		2,403
Fair Value Nonrecurring Basis \| Level 3 \| Individually evaluated loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	4,557	$ 105	1,424
Fair Value Nonrecurring Basis \| Level 3 \| Foreclosed Assets \| Foreclosed assets (Residential real estate)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 214		$ 979

Fair Value Measurement - Quan_2

Fair Value Measurement - Quantitative Information about (Level 3) Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Foreclosed assets (Residential real estate)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 214	$ 979
Individually evaluated loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 4,557	$ 1,424

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 ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial assets:
Cash and due from banks	$ 94,157	$ 77,253
Cash at Federal Reserve and other banks	515,365	592,298
Amortized cost, held to maturity	260,454	284,563
Financial liabilities:
Other borrowings	36,226	26,914
Junior subordinated debt	57,742	57,635
Level 3 \| Overdraft Privilege Commitments
Off-balance sheet:
Contract amount, Off-balance sheet	122,965	110,813
Level 3 \| Standby letters of credit
Off-balance sheet:
Contract amount, Off-balance sheet	14,543	15,056
Level 3 \| Commitments
Off-balance sheet:
Contract amount, Off-balance sheet	1,476,847	1,426,827
Carrying Amount \| Level 1
Financial assets:
Cash and due from banks	94,157	77,253
Cash at Federal Reserve and other banks	515,365	592,298
Carrying Amount \| Level 2
Financial assets:
Amortized cost, held to maturity	260,454	284,563
Restricted equity securities	17,250	17,250
Financial liabilities:
Deposits	6,863,400	6,505,934
Other borrowings	36,266	26,914
Carrying Amount \| Level 3
Financial assets:
Loans, net	4,881,036	4,671,280
Financial liabilities:
Junior subordinated debt	57,742	57,635
Fair Value \| Level 1
Financial assets:
Cash and due from banks	94,157	77,253
Cash at Federal Reserve and other banks	515,365	592,298
Fair Value \| Level 2
Financial assets:
Amortized cost, held to maturity	271,439	298,726
Financial liabilities:
Deposits	6,870,196	6,507,235
Other borrowings	36,266	26,914
Fair Value \| Level 3
Financial assets:
Loans, net	4,885,946	4,753,027
Financial liabilities:
Junior subordinated debt	57,685	56,632
Fair Value \| Level 3 \| Overdraft Privilege Commitments
Off-balance sheet:
Fair value, Off-balance sheet	1,229	1,108
Fair Value \| Level 3 \| Standby letters of credit
Off-balance sheet:
Fair value, Off-balance sheet	145	151
Fair Value \| Level 3 \| Commitments
Off-balance sheet:
Fair value, Off-balance sheet	$ 14,768	$ 14,268

Regulatory Matters - Actual and

Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Parent
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets)	$ 825,099	$ 793,433
Tier 1 Capital (to Risk Weighted Assets)	756,668	727,879
Common Equity Tier 1 Capital (to Risk Weighted Assets)	700,660	671,975
Tier 1 Capital (to Average Assets)	$ 756,668	$ 727,879
Total Capital Ratio (to Risk Weighted Assets)	15.13%	15.22%
Tier 1 Capital Ratio (to Risk Weighted Assets)	13.88%	13.96%
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets)	12.85%	12.89%
Tier 1 Capital Ratio (to Average Assets)	10.00%	9.93%
Parent \| Basel III Fully Phased In
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement	$ 572,425	$ 547,352
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement	463,392	443,094
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement	381,617	364,901
Tier 1 Capital (to Average Assets), Minimum Capital Requirement	$ 302,730	$ 293,138
Total Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	10.50%	10.50%
Tier 1 Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	8.50%	8.50%
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	7.00%	7.00%
Tier 1 Capital Ratio (to Average Assets), Minimum Capital Requirement	4.00%	4.00%
Tri Countries Bank
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets)	$ 812,092	$ 780,320
Tier 1 Capital (to Risk Weighted Assets)	743,705	714,811
Common Equity Tier 1 Capital (to Risk Weighted Assets)	743,705	714,811
Tier 1 Capital (to Average Assets)	$ 743,705	$ 714,811
Total Capital Ratio (to Risk Weighted Assets)	14.90%	14.97%
Tier 1 Capital Ratio (to Risk Weighted Assets)	13.65%	13.72%
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets)	13.65%	13.72%
Tier 1 Capital Ratio (to Average Assets)	9.84%	9.76%
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 544,980	$ 521,101
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 435,984	$ 416,881
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 354,237	$ 338,716
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 377,981	$ 366,186
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Tri Countries Bank \| Basel III Fully Phased In
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement	$ 572,229	$ 547,156
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement	463,233	442,936
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement	381,486	364,771
Tier 1 Capital (to Average Assets), Minimum Capital Requirement	$ 302,385	$ 292,949
Total Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	10.50%	10.50%
Tier 1 Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	8.50%	8.50%
Common Equity Tier 1 Capital Ratio (to Risk Weighted Assets), Minimum Capital Requirement	7.00%	7.00%
Tier 1 Capital Ratio (to Average Assets), Minimum Capital Requirement	4.00%	4.00%