Sandy Spring Bancorp (SASR) 10-Q 6 Nov 20 2020 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2020	Nov. 04, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	0-19065
Entity Registrant Name	SANDY SPRING BANCORP, INC.
Entity Incorporation State Country Code	MD
Entity Tax Identification Number	52-1532952
Entity Address Address Line1	17801 Georgia Avenue
Entity Address City Or Town	Olney
Entity Address State Or Province	MD
Entity Address Postal Zip Code	20832
City Area Code	301
Local Phone Number	774-6400
Security 12b Title	Common Stock, par value $1.00 per share
Trading Symbol	SASR
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 (in shares)		47,040,422
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000824410
Current Fiscal Year End Date	--12-31

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF CONDITION - UNAUDITED - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets:
Cash and due from banks	$ 107,364	$ 82,469
Federal funds sold	390	208
Interest-bearing deposits with banks	117,129	63,426
Cash and cash equivalents	224,883	146,103
Residential mortgage loans held for sale (at fair value)	88,728	53,701
Investments available-for-sale (at fair value)	1,357,205	1,073,333
Equity securities	68,528	51,803
Total loans	10,333,935	6,705,232
Less: allowance for credit losses	(170,314)	(56,132)
Net loans	10,163,621	6,649,100
Premises and equipment, net	58,738	58,615
Other real estate owned	1,389	1,482
Accrued interest receivable	48,176	23,282
Goodwill	370,549	347,149
Other intangible assets, net	34,175	7,841
Other assets	262,139	216,593
Total assets	12,678,131	8,629,002
Liabilities:
Noninterest-bearing deposits	3,458,804	1,892,052
Interest-bearing deposits	6,506,165	4,548,267
Total deposits	9,964,969	6,440,319
Securities sold under retail repurchase agreements and federal funds purchased	462,706	213,605
Advances from FHLB	444,210	513,777
Subordinated debt	230,300	209,406
Total borrowings	1,137,216	936,788
Accrued interest payable and other liabilities	151,197	118,921
Total liabilities	11,253,382	7,496,028
Stockholders' equity:
Common stock	47,026	34,970
Additional paid in capital	845,399	586,622
Retained earnings	514,831	515,714
Accumulated other comprehensive income/ (loss)	17,493	(4,332)
Total stockholders' equity	1,424,749	1,132,974
Total liabilities and stockholders' equity	$ 12,678,131	$ 8,629,002

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF CONDITION - UNAUDITED - (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	47,025,779	34,970,370
Common stock, shares outstanding (in shares)	47,025,779	34,970,370

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income:
Interest and fees on loans	$ 106,560	$ 79,167	$ 288,721	$ 239,028
Interest on loans held for sale	398	572	1,094	1,145
Interest on deposits with banks	84	783	419	1,405
Interest and dividends on investment securities:
Taxable for federal income taxes	4,488	5,221	17,270	16,302
Exempt from federal income taxes	1,454	1,337	4,264	4,591
Interest on federal funds sold	0	2	1	8
Total interest income	112,984	87,082	311,769	262,479
Interest expense:
Interest on deposits	9,439	16,332	35,241	46,958
Interest on retail repurchase agreements and federal funds purchased	551	257	1,731	945
Interest on advances from FHLB	2,841	3,222	3,863	13,389
Interest on subordinated debt	2,669	481	7,602	1,462
Total interest expense	15,500	20,292	48,437	62,754
Net interest income	97,484	66,790	263,332	199,725
Provision for credit losses	7,003	1,524	90,158	3,029
Net interest income after provision for credit losses	90,481	65,266	173,174	196,696
Investment securities gains	51	15	432	20
Insurance agency commissions	2,122	2,116	5,439	5,281
Income from bank owned life insurance	708	662	2,162	2,505
Other income	1,418	1,901	5,276	6,037
Total non-interest income	29,390	18,573	70,482	52,098
Non-interest expense:
Salaries and employee benefits	36,041	26,234	98,391	77,699
Occupancy expense of premises	5,575	4,816	16,147	14,807
Equipment expense	3,133	2,641	9,103	7,929
Marketing	1,305	1,541	3,223	3,371
Outside data services	2,614	1,973	6,365	5,713
FDIC insurance	1,340	(83)	3,200	2,137
Amortization of intangible assets	1,968	491	4,566	1,465
Merger and acquisition expense	1,263	364	25,171	364
Professional fees and services	1,800	1,546	5,466	4,425
Other expenses	5,898	5,402	22,489	15,094
Total non-interest expense	60,937	44,925	194,121	133,004
Income before income taxes	58,934	38,914	49,535	115,790
Income tax expense	14,292	9,531	9,244	27,814
Net income	$ 44,642	$ 29,383	$ 40,291	$ 87,976
Per share information:
Basic net income per common share (in dollars per share)	$ 0.94	$ 0.82	$ 0.93	$ 2.46
Diluted net income per common share (in dollars per share)	0.94	0.82	0.93	2.45
Dividends declared per share (in dollars per share)	$ 0.30	$ 0.30	$ 0.90	$ 0.88
Service charges on deposit accounts
Fees and Commissions, Mortgage Banking and Servicing	$ 1,673	$ 2,516	$ 5,149	$ 7,265
Mortgage banking activities
Fees and Commissions, Mortgage Banking and Servicing	14,108	4,408	25,567	10,541
Wealth management income
Fees and Commissions, Mortgage Banking and Servicing	7,785	5,493	22,355	16,268
Bank card fees
Fees and Commissions, Mortgage Banking and Servicing	$ 1,525	$ 1,462	$ 4,102	$ 4,181

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 44,642	$ 29,383	$ 40,291	$ 87,976
Investments available-for-sale:
Net change in unrealized gains on investments available-for-sale	3,445	912	29,074	16,893
Related income tax expense	(909)	(239)	(7,424)	(4,418)
Net investment gains reclassified into earnings	(51)	(15)	(432)	(20)
Related income tax expense	13	4	110	5
Net effect on other comprehensive income for the period	2,498	662	21,328	12,460
Defined benefit pension plan:
Recognition of unrealized loss	219	264	656	794
Related income tax benefit	(48)	(69)	(159)	(208)
Net effect on other comprehensive income for the period	171	195	497	586
Total other comprehensive income	2,669	857	21,825	13,046
Comprehensive income	$ 47,311	$ 30,240	$ 62,116	$ 101,022

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - UNAUDITED - USD ($) $ in Thousands	Total	Revision of Prior Period, Accounting Standards Update, Adjustment	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained EarningsRevision of Prior Period, Accounting Standards Update, Adjustment	Accumulated Other Comprehensive Income/ (Loss)
Balance at beginning of period at Dec. 31, 2018	$ 1,067,903		$ 35,531	$ 606,573	$ 441,553		$ (15,754)
Net income	87,976				87,976
Other comprehensive income, net of tax	13,046						13,046
Total comprehensive income	101,022
Common stock dividends	(31,509)				(31,509)
Stock compensation expense	2,259			2,259
Stock option plan	259		12	247
Director's stock purchase plan	30		1	29
Employee stock purchase plan	779		27	752
Restricted stock, net	(702)		55	(757)
Balance at end of period at Sep. 30, 2019	1,140,041		35,626	609,103	498,020		(2,708)
Balance at beginning of period at Jun. 30, 2019	1,119,445		35,615	608,006	479,389		(3,565)
Net income	29,383				29,383
Other comprehensive income, net of tax	857						857
Total comprehensive income	30,240
Common stock dividends	(10,752)				(10,752)
Stock compensation expense	786			786
Stock option plan	35		1	34
Employee stock purchase plan	287		10	277
Balance at end of period at Sep. 30, 2019	1,140,041		35,626	609,103	498,020		(2,708)
Balance at beginning of period at Dec. 31, 2019	1,132,974		34,970	586,622	515,714		(4,332)
Net income	40,291				40,291		0
Other comprehensive income, net of tax	21,825						21,825
Total comprehensive income	62,116
Common stock dividends	(38,953)				(38,953)
Stock compensation expense	2,824			2,824	0
Revere Bank acquisition	289,089		12,769	276,320
Stock option plan	165		11	154
Conversion of Revere stock options	3,611		0	3,611
Employee stock purchase plan	1,309		50	1,259
Restricted stock, net	(463)		46	(509)
Adoption of ASC 326 - Financial Instruments - Credit Losses		$ (2,221)				$ (2,221)
Repurchase of common stock - 820,328 shares	(25,702)		(820)	(24,882)
Balance at end of period at Sep. 30, 2020	1,424,749		47,026	845,399	514,831		17,493
Balance at beginning of period at Jun. 30, 2020	1,390,093		47,001	843,876	484,392		14,824
Net income	44,642				44,642
Other comprehensive income, net of tax	2,669						2,669
Total comprehensive income	47,311
Common stock dividends	(14,205)				(14,205)
Stock compensation expense	1,032			1,032
Stock option plan	18		2	16
Employee stock purchase plan	524		21	503
Restricted stock, net	(26)		2	(28)
Adoption of ASC 326 - Financial Instruments - Credit Losses		$ 2				$ 2
Balance at end of period at Sep. 30, 2020	$ 1,424,749		$ 47,026	$ 845,399	$ 514,831		$ 17,493
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - UNAUDITED - (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Common stock dividends (in dollars per share)	$ 0.30	$ 0.30	$ 0.90	$ 0.88
Stock issued during period (in shares)			12,768,949
Stock option plan (in shares)	1,575	1,325	10,213	12,222
Conversion of Revere stock options (in shares)			395,298
Employee stock purchase plan (in shares)	21,374	9,544	50,189	27,210
Restricted stock (in shares)	1,808		46,386	54,789
Director stock purchase plan (in shares)				867
Stock repurchased and retired (in shares)			820,328

CONDENSED CONSOLIDATED STATEM_7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating activities:
Net income	$ 44,642	$ 29,383	$ 40,291	$ 87,976
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			14,915	10,006
Provision for credit losses	7,003	1,524	90,158	3,029	$ 4,684
Share based compensation expense			2,824	2,259
Tax (expense)/ benefit associated with share based compensation			(162)	75
Deferred income tax expense/ (benefit)			(22,965)	455
Origination of loans held for sale			(1,042,787)	(638,820)
Proceeds from sales of loans held for sale			1,025,610	590,997
Gains on sales of loans held for sale			(17,850)	(8,225)
Losses on sales of other real estate owned			32	173
Investment securities gains	(51)	(15)	(432)	(20)
Net (increase)/ decrease in accrued interest receivable			(17,243)	1,171
Net (increase)/ decrease in other assets			1,812	(3,997)
Net increase/ (decrease) in accrued expenses and other liabilities			5,173	(4,510)
Other – net			2,922	2,341
Net cash provided by operating activities			82,298	42,910
Investing activities:
(Purchases of)/ proceeds from other equity securities			(6,321)
(Purchases of)/ proceeds from other equity securities				21,451
Purchases of investments available-for-sale			(529,522)	(83,835)
Proceeds from sales of investments available-for-sale			121,357	0
Proceeds from maturities, calls and principal payments of investments available-for-sale			329,197	141,880
Net increase in loans			(1,107,824)	(25,327)
Proceeds from the sales of other real estate owned			60	324
Cash paid for the acquisition of business activity of RPJ, net of cash acquired			(26,925)	0
Cash acquired in the acquisition of business activity of Revere Bank, net of cash paid			80,466	0
Expenditures for premises and equipment			(3,399)	(4,269)
Net cash provided by/ (used in) investing activities			(1,142,911)	50,224
Financing activities:
Net increase in deposits			1,202,228	579,019
Net increase/ (decrease) in retail repurchase agreements and federal funds purchased			249,101	(201,421)
Proceeds from advances from FHLB			400,000	2,123,000
Repayment of advances from FHLB			(637,982)	(2,454,134)
Retirement of subordinated debt			(10,310)	0
Proceeds from issuance of common stock			1,474	1,068
Stock tendered for payment of withholding taxes			(463)	(702)
Repurchase of common stock			(25,702)	0
Dividends paid			(38,953)	(31,509)
Net cash provided by financing activities			1,139,393	15,321
Net increase in cash and cash equivalents			78,780	108,455
Cash and cash equivalents at beginning of period			146,103	101,481	101,481
Cash and cash equivalents at end of period	$ 224,883	$ 209,936	224,883	209,936	$ 146,103
Supplemental disclosures:
Interest payments			47,105	65,481
Income tax payments, net of refunds of $1,924 in 2020			28,099	23,417
Transfer from loans to other real estate owned			$ 0	$ 414

CONDENSED CONSOLIDATED STATEM_8

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Parenthetical $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Statement of Cash Flows [Abstract]
Income tax refunds	$ 1,924

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES Nature of Operations Sandy Spring Bancorp, Inc. ("Sandy Spring" or, together with its subsidiaries, the "Company"), a Maryland corporation, is the bank holding company for Sandy Spring Bank (the “Bank”). Independent and community-oriented, Sandy Spring Bank offers a broad range of commercial banking, retail banking, mortgage services and trust services throughout central Maryland, Northern Virginia, and the greater Washington, D.C. market. Sandy Spring Bank also offers a comprehensive menu of insurance and wealth management services through its subsidiaries, Sandy Spring Insurance Corporation (“Sandy Spring Insurance”), West Financial Services, Inc. (“West Financial”) and Rembert Pendleton Jackson (“RPJ”). Basis of Presentation The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America (“GAAP”), prevailing practices within the financial services industry for interim financial information and Rule 10-01 of Regulation S-X. Accordingly, the interim financial statements do not include all of the information and notes required for complete financial statements. The following summary of significant accounting policies of the Company is presented to assist the reader in understanding the financial and other data presented in this report. Operating results for the three and nine months ended September 30, 2020 are not necessarily indicative of the results that may be expected for any future periods or for the year ending December 31, 2020. In the opinion of management, all adjustments necessary for a fair presentation of the results of the interim periods have been included. Certain reclassifications have been made to prior period amounts, as necessary, to conform to the current period presentation. The Company has evaluated subsequent events through the date of the issuance of its financial statements. These statements should be read in conjunction with the financial statements and accompanying notes included in the Company’s 2019 Annual Report on Form 10-K as filed with the Securities and Exchange Commission (“SEC”) on February 21, 2020. With the exception of the adoption of ASC 326 – Financial Instruments – Credit Losses, commonly referred to as Current Expected Credit Losses ("CECL") standard, during the first quarter of 2020, there have been no other significant changes to any of the Company’s accounting policies as disclosed in the 2019 Annual Report on Form 10-K. Principles of Consolidation The unaudited Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiary, Sandy Spring Bank, and its subsidiaries, Sandy Spring Insurance, West Financial and RPJ. Consolidation has resulted in the elimination of all intercompany accounts and transactions. See Note 18 for more information on the Company’s segments and consolidation. Use of Estimates The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, in addition to affecting the reported amounts of revenues earned and expenses incurred during the reporting period. Actual results could differ from those estimates. Estimates that could change significantly relate to the provision for credit losses and the related allowance, potential impairment of goodwill or other intangible assets, valuation of investment securities and the determination of whether available-for-sale debt securities with fair values less than amortized costs are impaired and require an allowance for credit losses, valuation of other real estate owned, valuation of share based compensation, the assessment that a liability should be recognized with respect to any matters under litigation, the calculation of current and deferred income taxes, and the actuarial projections related to pension expense and the related liability. Cash Flows For purposes of reporting cash flows, cash and cash equivalents include cash and due from banks, federal funds sold and interest-bearing deposits with banks (items with stated original maturity of three months or less). Revenue from Contracts with Customers The Company’s revenue includes net interest income on financial instruments and non-interest income. Specific categories of revenue are presented in the Condensed Consolidated Statements of Income. Most of the Company’s revenue is not within the scope of Accounting Standard Codification (“ASC”) 606 – Revenue from Contracts with Customers. For revenue within the scope of ASC 606, the Company provides services to customers and has related performance obligations. The revenue from such services is recognized upon satisfaction of all contractual performance obligations. The following discusses key revenue streams within the scope of revenue recognition guidance. Wealth Management Income West Financial and RPJ provide comprehensive investment management and financial planning services. Wealth management income is comprised of income for providing trust, estate and investment management services. Trust services include acting as a trustee for corporate or personal trusts. Investment management services include investment management, record-keeping and reporting of security portfolios. Fees for these services are recognized based on a contractually-agreed fixed percentage applied to net assets under management at the end of each reporting period. The Company does not charge/recognize any performance-based fees. Insurance Agency Commissions Sandy Spring Insurance, a subsidiary of the Bank, performs the function of an insurance intermediary by introducing the policyholder and insurer and is compensated by a commission fee for placement of an insurance policy. Sandy Spring Insurance does not provide any captive management services or any claim handling services. Commission fees are set as a percentage of the premium for the insurance policy for which Sandy Spring Insurance is a producer. Sandy Spring Insurance recognizes revenue when the insurance policy has been contractually agreed to by the insurer and policyholder (at transaction date). Service Charges on Deposit Accounts Service charges on deposit accounts are earned on depository accounts for consumer and commercial account holders and include fees for account and overdraft services. Account services include fees for event-driven services and periodic account maintenance activities. An obligation for event-driven services is satisfied at the time of the event when service is delivered and revenue recognized as earned. Obligation for maintenance activities is satisfied over the course of each month and revenue is recognized at month end. The overdraft services obligation is satisfied at the time of the overdraft and revenue is recognized as earned. Loan Financing Receivables The Company’s financing receivables consist primarily of loans that are stated at their principal balance outstanding, net of any unearned income, acquisition fair value marks and deferred loan origination fees and costs. Interest income on loans is accrued at the contractual rate based on the principal balance outstanding. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the related loan yield using the interest method. The Company has provided short term deferrals of loan principal and/or interest payments up to 180 days for customers who are affected by the COVID-19 pandemic. Customers receiving payment deferrals must meet certain criteria, such as being in good standing and not more than 30 days past due prior to the pandemic. In most cases, the deferred principal and/or interest amounts will be collected at the end of the life of the loan and will not accrue additional interest. The granting of a deferral of principal and/or interest under the Coronavirus Aid, Relief, and Economic Security (“CARES”) Act does not subject the loan to the past due, non-accrual, or troubled debt restructurings (“TDR”) policies described below. The following discussions of past due, non-accrual, and TDR policies remain valid for situations not covered by the CARES Act. Loans are considered past due or delinquent when the principal or interest due in accordance with the contractual terms of the loan agreement or any portion thereof remains unpaid after the due date of the scheduled payment. Immaterial shortfalls in payment amounts do not necessarily result in a loan being considered delinquent or past due. If any payments are past due and subsequent payments are resumed without payment of the delinquent amount, the loan shall continue to be considered past due. Whenever any loan is reported delinquent on a principal or interest payment or portion thereof, the amount reported as delinquent is the outstanding principal balance of the loan. Loans, except for consumer installment loans, are placed into non-accrual status when any portion of the loan principal or interest becomes 90 days past due. Management may determine that certain circumstances warrant earlier discontinuance of interest accruals on specific loans if an evaluation of other relevant factors (such as bankruptcy, interruption of cash flows, etc.) indicates collection of amounts contractually due is unlikely. These loans are considered, collectively, to be non-performing loans. Consumer installment loans that are not secured by real estate are not placed on non-accrual, but are charged down to their net realizable value when they are four months past due. Loans designated as non-accrual have all previously accrued but unpaid interest reversed. Interest income is not recognized on non-accrual loans. All payments received on non-accrual loans are applied using a cost-recovery method to reduce the outstanding principal balance until the loan returns to accrual status. Loans may be returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured. Loans considered to be TDRs are loans that have their terms restructured (e.g., interest rates, loan maturity date, payment and amortization period, etc.) in circumstances that provide payment relief to a borrower experiencing financial difficulty. All restructured collateral-dependent loans are individually assessed for allowance for credit losses and may either be in accruing or non-accruing status. Non-accruing restructured loans may return to accruing status provided doubt has been removed concerning the collectability of principal and interest as evidenced by a sufficient period of payment performance in accordance with the restructured terms. Loans may be removed from the restructured category if the borrower is no longer experiencing financial difficulty, a re-underwriting event took place, and the revised loan terms of the subsequent restructuring agreement are considered to be consistent with terms that can be obtained in the market for loans with comparable credit risk. In accordance with provisions of the CARES Act and interagency guidance issued by the federal banking agencies, the Company does not classify COVID-19 short term loan modifications as TDRs, nor are the customers considered delinquent with regard to their deferred payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it was determined upon entry into the program. Allowance for Credit Losses The allowance for credit losses (“allowance” or “ACL”) represents an amount which, in management's judgment, is adequate to absorb the lifetime expected losses that may be sustained on outstanding loans at the balance sheet date based on the evaluation of the size and current risk characteristics of the loan portfolio, past events, current conditions, reasonable and supportable forecasts of future economic conditions and prepayment experience. The allowance is measured and recorded upon the initial recognition of a financial asset. The allowance is reduced by charge-offs, net of recoveries of previous losses, and is increased or decreased by a provision or credit for credit losses, which is recorded as a current period expense. Determination of the adequacy of the allowance is inherently complex and requires the use of significant and highly subjective estimates. The reasonableness of the allowance is reviewed periodically by the Risk Committee of the Board of Directors and formally approved quarterly by that same committee of the Board. The Company’s methodology for estimating the allowance includes: (1) a collective quantified reserve that reflects the Company’s historical default and loss experience adjusted for expected economic conditions throughout a reasonable and supportable period and the Company’s prepayment and curtailment rates; (2) collective qualitative factors that consider concentrations of the loan portfolio, expected changes to the economic forecasts, large relationships, early delinquencies, and factors related to credit administrations, including, among others, loan-to-value ratios, borrowers’ risk rating and credit score migrations; and (3) individual allowances on collateral-dependent loans where borrowers are experiencing financial difficulty or when the Company determines that the foreclosure is probable. The Company excludes accrued interest from the measurement of the allowance as the Company has a non-accrual policy to reverse any accrued, uncollected interest income as loans are moved to non-accrual status. Loans are pooled into segments based on the similar risk characteristics of the underlying borrowers, in addition to consideration of collateral type, industry and business purpose of the loans. Portfolio segments used to estimate the allowance are the same as portfolio segments used for general credit risk management purposes. Refer to Note 4 for more details on the Company’s portfolio segments. The Company applies two calculation methodologies to estimate the collective quantified component of the allowance: discounted cash flows method and weighted average remaining life method. Allowance estimates on commercial acquisition, development and construction (“AD&C”) and residential construction segments are based on the weighted average remaining life method. Allowance estimates on all other portfolio segments are based on the discounted cash flows method. Segments utilizing the discounted cash flows method are further sub-segmented into risk level pools, determined either by risk rating for commercial loans or Beacon Scores ranges for residential and consumer loans. To better manage risk and reasonably determine the sufficiency of reserves, this segregation allows the Company to monitor the allowance component applicable to higher risk loans separate from the remainder of the portfolio. Collective calculation methodologies utilize the Company’s historical default and loss experience adjusted for future economic forecasts. The reasonable and supportable forecast period represents a two-year economic outlook for the applicable economic variables. Following the end of the reasonable and supportable forecast period expected losses revert back to the historical mean over the next two years on a straight-line basis. Economic variables that have the most significant impact on the allowance include: unemployment rate, house price index and number of business bankruptcies. Contractual loan level cash flows within the discounted cash flows methodology are adjusted for the Company’s historical prepayment and curtailment rate experience. The individual reserve assessment is applied to collateral dependent loans where borrowers are experiencing financial difficulty or when the Company determines that a foreclosure is probable. The determination of the fair value of the collateral depends on whether a repayment of the loan is expected to be from the sale or the operation of the collateral. When a repayment is expected from the operation of the collateral, the Company uses the present value of expected cash flows from the operation of the collateral as the fair value. When the repayment of the loan is expected from the sale of the collateral the fair value of the collateral is based on an observable market price or the collateral’s appraised value, less estimated costs to sell. Third party appraisals used in the individual reserve assessment are conducted at least annually with underlying assumptions that are reviewed by management. Third party appraisals may be obtained on a more frequent basis if deemed necessary. Internal evaluations of collateral value are conducted quarterly to ensure any further deterioration of the collateral value is recognized on a timely basis. During the individual reserve assessment, management also considers the potential future changes in the value of the collateral over the remainder of the loan’s remaining life. The Company may receive updated appraisals which contradict the preliminary determination of fair value used to establish an individual allowance on a loan. In these instances the individual allowance is adjusted to reflect the Company’s evaluation of the updated appraised fair value. In the event a loss was previously confirmed and the loan was charged down to the estimated fair value based on a previous appraisal, the balance of partially charged-off loans are not subsequently increased, but could be further decreased depending on the direction of the change in fair value. Payments on fully or partially charged-off loans are accounted for under the cost-recovery method. Under this method, all payments received are applied on a cash basis to reduce the entire outstanding principal balance, then to recognize a recovery of all previously charged-off amounts before any interest income may be recognized. Based on the individual reserve assessment, if the Company determines that the fair value of the collateral is less than the amortized cost basis of the loan, an individual allowance will be established measured as the difference between the fair value of the collateral (less costs to sell) and the amortized cost basis of the loan. Once a loss has been confirmed, the loan is charged-down to its estimated fair value. Large groups of smaller non-accrual homogeneous loans are not individually evaluated for allowance and include residential permanent and construction mortgages and consumer installment loans. These portfolios are reserved for on a collective basis using historical loss rates of similar loans over the weighted average life of each pool. Management believes it uses relevant information available to make determinations about the allowance and that it has established the existing allowance in accordance with GAAP. However, the determination of the allowance requires significant judgment, and estimates of expected lifetime losses in the loan portfolio can vary significantly from the amounts actually observed. While management uses available information to recognize expected losses, future additions to the allowance may be necessary based on changes in the loans comprising the portfolio, changes in the current and forecasted economic conditions, changes to the interest rate environment which may directly impact prepayment and curtailment rate assumptions, and changes in the financial condition of borrowers. The adoption of the CECL standard did not result in a significant change to any other credit risk management and monitoring processes, including identification of past due or delinquent borrowers, non-accrual practices, assessment of troubled debt restructurings or charge-off policies. Acquired Loans Loans acquired in connection with acquisitions are recorded at their acquisition-date fair value. The allowance for credit losses related to the acquired loan portfolio is not carried over. Acquired loans are classified into two categories based on the credit risk characteristics of the underlying borrowers as either purchased credit deteriorated (“PCD”) loans, or loans with no evidence of credit deterioration (“non-PCD”). PCD loans are defined as a loan or pool of loans that have experienced more-than-insignificant credit deterioration since the origination date. The Company uses a combination of individual and pooled review approaches to determine if acquired loans are PCD. At acquisition, the Company considers a number of factors to determine if an acquired loan or pool of loans has experienced more-than-insignificant credit deterioration. These factors include: • loans classified as non-accrual, • loans with risk rating of special mention or worse (using the Company's risk rating scale), • loans with multiple risk rating downgrades since origination, • loans with evidence of being 60 days or more past due, • loans previously modified in a troubled debt restructuring, • loans that received an interest only or payment deferral modification, and • loans in industries that show evidence of additional risk due to economic conditions. The initial allowance related to PCD loans that share similar risk characteristics is established using a pooled approach. The Company uses either a discounted cash flow or weighted average remaining life method to determine the required level of the allowance. PCD loans that were classified as non-accrual as of the acquisition date and are collateral dependent are assessed for allowance on an individual basis. For PCD loans, an initial allowance is established on the acquisition date and added to the fair value of the loan to arrive at acquisition date amortized cost. Accordingly, no provision for credit losses is recognized on PCD loans at the acquisition date. Subsequent to the acquisition date, the initial allowance on PCD loans will increase or decrease based on future evaluations, with changes recognized in the provision for credit losses. Non-PCD loans are pooled into segments together with originated loans that share similar risk characteristics and have an allowance established on the acquisition date, which is recognized in the current period provision for credit losses. Determining the fair value of the acquired loans involves estimating the principal and interest payment cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. Management considers a number of factors in evaluating the acquisition-date fair value including the remaining life, interest rate profile, market interest rate environment, payment schedules, risk ratings, probability of default and loss given default, and estimated prepayment rates. For PCD loans, the non-credit discount or premium is allocated to individual loans as determined by the difference between the loan’s unpaid principal balance and amortized cost basis. The non-credit premium or discount is recognized into interest income on a level yield basis over the remaining expected life of the loan. For non-PCD loans, the fair value discount or premium is allocated to individual loans and recognized into interest income on a level yield basis over the remaining expected life of the loan. Leases The Company determines if an arrangement is a lease at inception. All of the Company’s leases are currently classified as operating leases and are included in other assets and other liabilities on the Company’s Condensed Consolidated Statements of Condition. Right-of-use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term, and lease liabilities represent the Company’s obligation to make lease payments arising from the lease arrangements. Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of the expected future lease payments over the remaining lease term. In determining the present value of future lease payments, the Company uses its incremental borrowing rate based on the information available at the lease commencement date. The operating ROU assets are adjusted for any lease payments made at or before the lease commencement date, initial direct costs, any lease incentives received and, for acquired leases, any favorable or unfavorable fair value adjustments. The present value of the lease liability may include the impact of options to extend or terminate the lease when it is reasonably certain that the Company will exercise such options provided in the lease terms. Lease expense is recognized on a straight-line basis over the expected lease term. Lease agreements that include lease and non-lease components, such as common area maintenance charges, are accounted for separately. Pending Accounting Pronouncements In March 2020, FASB released Accounting Standards Update (“ASU”) 2020-04 - Reference Rate Reform (Topic 848) , which provides optional guidance to ease the accounting burden in accounting for, or recognizing the effects from, reference rate reform on financial reporting. The new standard is a result of LIBOR likely being discontinued as an available benchmark rate. The standard is elective and provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, or other transactions that reference LIBOR, or another reference rate expected to be discontinued. The amendments in the update are effective for all entities between March 12, 2020 and December 31, 2022. The Company has established a cross-functional working group to guide the Company’s transition from LIBOR and has begun efforts to transition to alternative rates consistent with industry timelines. The Company has identified its products that utilize LIBOR and has implemented enhanced fallback language to facilitate the transition to alternative reference rates. The Company is evaluating existing platforms and systems and preparing to offer new rates. In December 2019, FASB released ASU 2019-12 - Income Taxes (Topic 740), which simplifies the accounting for income taxes by removing multiple exceptions to the general principals in Topic 740. The standard is effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2020. The Company does not expect the adoption of this standard to have a material impact on the Company’s Condensed Consolidated Financial Statements.

ACQUISITION OF REVERE BANK

ACQUISITION OF REVERE BANK	9 Months Ended
	Sep. 30, 2020
Business Combinations [Abstract]
ACQUISITION OF REVERE BANK	ACQUISITION OF REVERE BANK On April 1, 2020 (“Acquisition Date”), the Company completed the acquisition of Revere Bank (“Revere”), a Maryland chartered commercial bank, in accordance with the definitive agreement that was entered on September 23, 2019 by and among the Company, the Bank and Revere. In connection with the completion of the merger, former Revere shareholders received 1.05 shares of Sandy Spring common stock for each share of Revere common stock they held. Based on the $22.64 per share closing price of Sandy Spring common stock on March 31, 2020, and including the fair value of options converted or cashed-out, the total transaction value was approximately $293 million. Upon completion of the acquisition, Sandy Spring shareholders owned approximately 74 percent of the combined company, and former Revere shareholders owned approximately 26 percent. As of March 31, 2020, Revere, headquartered in Rockville, MD, had more than $2.8 billion in assets and operated 11 full-service community banking offices throughout the Washington D.C. metropolitan region. The acquisition of Revere was accounted for as a business combination using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed, and consideration paid are recorded at estimated fair values on the Acquisition Date. The provisional amount of goodwill recognized as of the Acquisition Date was approximately $0.8 million. If considered necessary, additional adjustments to the fair value measurement of certain accounts, for example loans, may be made until the 12 month measurement period is closed. Any subsequent adjustments to the fair values of assets acquired and liabilities assumed, identifiable intangible assets, or other purchase accounting adjustments, as discussed above, will result in adjustments to goodwill within the first 12 months following the Acquisition Date. The goodwill is not expected to be deductible for tax purposes. The consideration paid for Revere’s common equity and outstanding stock options and the provisional fair values of acquired identifiable assets and assumed identifiable liabilities as of the Acquisition Date were as follows: (Dollars in thousands, except per share data) April 1, 2020 Purchase price: Fair value of common shares issued (12,768,949 shares) based on Sandy Spring's share price of $22.64 $ 289,089 Fair value of Revere stock options converted to Sandy Spring stock options 3,611 Cash paid for cashed-out Revere stock options 291 Cash for fractional shares 11 Total purchase price $ 293,002 Identifiable assets: Cash and cash equivalents $ 80,768 Investments available-for-sale 180,752 Loans 2,502,244 Premises and equipment 3,443 Accrued interest receivable 7,651 Core deposit intangible asset 18,360 Other assets 52,812 Total identifiable assets $ 2,846,030 Identifiable liabilities: Deposits $ 2,322,422 Borrowings 205,514 Other liabilities 25,933 Total identifiable liabilities $ 2,553,869 Provisional fair value of net assets acquired including identifiable intangible assets 292,161 Provisional resulting goodwill $ 841

INVESTMENTS

INVESTMENTS	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
INVESTMENTS	INVESTMENTS Investments available-for-sale The amortized cost and estimated fair values of investments available-for-sale at the dates indicated are presented in the following table: September 30, 2020 December 31, 2019 (In thousands) Amortized Gross Gross Estimated Amortized Gross Gross Estimated U.S. treasuries and government agencies $ 140,454 $ 914 $ (1,963) $ 139,405 $ 260,294 $ 887 $ (2,686) $ 258,495 State and municipal 344,168 9,435 (616) 352,987 229,309 4,377 (37) 233,649 Mortgage-backed and asset-backed 826,450 25,967 (103) 852,314 568,373 3,268 (882) 570,759 Corporate debt 12,112 394 (7) 12,499 9,100 452 — 9,552 Trust preferred — — — — 310 — — 310 Total debt securities 1,323,184 36,710 (2,689) 1,357,205 1,067,386 8,984 (3,605) 1,072,765 Marketable equity securities — — — — 568 — — 568 Total investments available-for-sale $ 1,323,184 $ 36,710 $ (2,689) $ 1,357,205 $ 1,067,954 $ 8,984 $ (3,605) $ 1,073,333 Any unrealized losses in the U.S. treasuries and government agencies, state and municipal, mortgage-backed and asset-backed investment securities at September 30, 2020 are due to changes in interest rates and not credit-related events. As such, no allowance for credit losses is required at September 30, 2020. Unrealized losses on investment securities are expected to recover over time as these securities approach maturity. The mortgage-backed securities portfolio at September 30, 2020 is composed entirely of either the most senior tranches of GNMA, FNMA or FHLMC collateralized mortgage obligations ($328.7 million), GNMA, FNMA or FHLMC mortgage-backed securities ($455.8 million) or SBA asset-backed securities ($67.8 million). The Company does not intend to sell these securities and has sufficient liquidity to hold these securities for an adequate period of time to allow for any anticipated recovery in fair value. Gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in an unrealized loss position at the dates indicated are presented in the following tables: September 30, 2020 Number Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. treasuries and government agencies 7 $ — $ — $ 91,193 $ 1,963 $ 91,193 $ 1,963 State and municipal 19 57,024 616 — — 57,024 616 Mortgage-backed and asset-backed 13 28,862 77 7,030 26 35,892 103 Corporate debt 2 3,005 7 — — 3,005 7 Total 41 $ 88,891 $ 700 $ 98,223 $ 1,989 $ 187,114 $ 2,689 December 31, 2019 Number Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. treasuries and government agencies 12 $ 133,221 $ 2,211 $ 17,911 $ 475 $ 151,132 $ 2,686 State and municipal 3 7,227 37 — — 7,227 37 Mortgage-backed and asset-backed 35 107,917 508 76,867 374 184,784 882 Total 50 $ 248,365 $ 2,756 $ 94,778 $ 849 $ 343,143 $ 3,605 The estimated fair values and amortized costs of debt securities available-for-sale by contractual maturity at the dates indicated are provided in the following table. The Company has allocated mortgage-backed securities into the four maturity groupings reflected in the following tables using the expected average life of the individual securities based on statistics provided by independent third party industry sources. Expected maturities will differ from contractual maturities as borrowers may have the right to prepay obligations with or without prepayment penalties. September 30, 2020 December 31, 2019 (In thousands) Fair Value Amortized Cost Fair Value Amortized Cost U.S. treasuries and government agencies: One year or less $ 28,139 $ 27,974 $ 69,799 $ 69,330 One to five years 11,902 11,380 96,709 96,507 Five to ten years — — — — After ten years 99,364 101,100 91,987 94,457 State and municipal: One year or less 18,663 18,457 33,311 33,054 One to five years 47,558 46,440 76,723 75,432 Five to ten years 59,670 56,731 75,820 73,741 After ten years 227,096 222,540 47,795 47,082 Mortgage-backed and asset-backed: One year or less 2 2 852 822 One to five years 21,191 20,800 7,125 6,969 Five to ten years 58,878 57,430 55,226 54,799 After ten years 772,243 748,218 507,556 505,783 Corporate debt: One year or less — — — — One to five years — — — — Five to ten years 12,499 12,112 9,552 9,100 After ten years — — — — Trust preferred: One year or less — — — — One to five years — — — — Five to ten years — — — — After ten years — — 310 310 Total available-for-sale debt securities $ 1,357,205 $ 1,323,184 $ 1,072,765 $ 1,067,386 At September 30, 2020 and December 31, 2019, investments available-for-sale with a book value of $421.0 million and $424.8 million, respectively, were pledged as collateral for certain government deposits and for other purposes as required or permitted by law. The outstanding balance of no single issuer, except for U.S. Agencies securities, exceeded ten percent of stockholders' equity at September 30, 2020 and December 31, 2019. Equity securities Other equity securities at the dates indicated are presented in the following table: (In thousands) September 30, 2020 December 31, 2019 Federal Reserve Bank stock $ 38,650 $ 22,559 Federal Home Loan Bank of Atlanta stock 29,201 29,244 Marketable equity securities 677 — Total equity securities $ 68,528 $ 51,803

LOANS

LOANS	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
LOANS	LOANSOutstanding loan balances at September 30, 2020 and December 31, 2019, are net of unearned income, including net deferred loan fees of $28.3 million and $1.8 million, respectively. Net deferred loan fees at September 30, 2020, includes $25.5 million related to the loans originated under the Paycheck Protection Program (“PPP”). The loan portfolio segment balances at the dates indicated are presented in the following table: (In thousands) September 30, 2020 December 31, 2019 Commercial real estate: Commercial investor real estate $ 3,588,702 $ 2,169,156 Commercial owner-occupied real estate 1,652,208 1,288,677 Commercial AD&C 994,800 684,010 Commercial business 2,227,246 801,019 Total commercial loans 8,462,956 4,942,862 Residential real estate: Residential mortgage 1,173,857 1,149,327 Residential construction 175,123 146,279 Consumer 521,999 466,764 Total residential and consumer loans 1,870,979 1,762,370 Total loans $ 10,333,935 $ 6,705,232 The fair value of the financial assets acquired in the Revere acquisition included loans receivable with a gross amortized cost basis of $2.5 billion. Of the loans acquired, the Company identified $974.8 million of loans that were classified as PCD. An initial allowance for credit losses of $18.6 million was recorded through a gross up adjustment to fair values of PCD loans. A fair value premium related to other factors totaled $4.5 million and will amortize to interest income over the remaining life of each loan. Total fair value of PCD loans as of the Acquisition Date was $960.7 million. As of September 30, 2020, the Revere PCD loans had a fair value of $901.9 million, with a remaining unamortized fair value premium of $4.0 million. Of the PCD loans, $11.3 million were non-accruing at the time of acquisition. Refer to Note 1 for more details on factors considered in the PCD assessment. At the Acquisition Date, non-PCD loans totaled $1.5 billion and had a net fair value premium of $2.1 million, which will amortize to interest income over the remaining life of each loan. As of September 30, 2020, the Revere non-PCD loans had a fair value of $1.4 billion with a remaining unamortized fair value premium of $1.5 million. See Note 1 for more information on the Company’s accounting policy for acquired loans and Note 2 for more information on the Revere acquisition. Portfolio Segments The Company currently manages its credit products and the respective exposure to credit losses (credit risk) by the following specific portfolio segments (classes) which are levels at which the Company develops and documents its systematic methodology to determine the allowance for credit losses attributable to each respective portfolio segment. These segments are: • Commercial investor real estate loans - Commercial investor real estate loans consist of loans secured by nonowner-occupied properties where an established banking relationship exists and involves investment properties for warehouse, retail, and office space with a history of occupancy and cash flow. This commercial investor real estate category contains mortgage loans to the developers and owners of commercial real estate where the borrower intends to operate or sell the property at a profit and use the income stream or proceeds from the sale(s) to repay the loan. • Commercial owner-occupied real estate loans - Commercial owner-occupied real estate loans consist of commercial mortgage loans secured by owner occupied properties where an established banking relationship exists and involves a variety of property types to conduct the borrower’s operations. The decision to extend a loan is based upon the borrower’s financial health and the ability of the borrower and the business to repay. The primary source of repayment for this type of loan is the cash flow from the operations of the business. • Commercial acquisition, development and construction loans - Commercial acquisition, development and construction loans are intended to finance the construction of commercial properties and include loans for the acquisition and development of land. Construction loans represent a higher degree of risk than permanent real estate loans and may be affected by a variety of additional factors such as the borrower’s ability to control costs and adhere to time schedules and the risk that constructed units may not be absorbed by the market within the anticipated time frame or at the anticipated price. The loan commitment on these loans often includes an interest reserve that allows the lender to periodically advance loan funds to pay interest charges on the outstanding balance of the loan. • Commercial business loans - Commercial loans are made to provide funds for equipment and general corporate needs. Repayment of a loan primarily comes from the funds obtained from the operation of the borrower’s business. Commercial loans also include lines of credit that are utilized to finance a borrower’s short-term credit needs and/or to finance a percentage of eligible receivables and inventory. Loans issued under the PPP are also included in this category, a substantial portion of which are expected to be forgiven by the Small Business Administration pursuant to the CARES Act. • Residential mortgage loans - The residential mortgage loans category contains permanent mortgage loans principally to consumers secured by residential real estate. Residential real estate loans are evaluated for the adequacy of repayment sources at the time of approval, based upon measures including credit scores, debt-to-income ratios, and collateral values. Loans may be either conforming or non-conforming. • Residential construction loans - The Company makes residential construction loans generally to provide interim financing on residential property during the construction period. Borrowers are typically individuals who will ultimately occupy the single-family dwelling. Loan funds are disbursed periodically as pre-specified stages of completion are attained based upon site inspections . • Consumer loans - This category of loans includes primarily home equity loans and lines, installment loans, personal lines of credit, and other loans. The home equity category consists mainly of revolving lines of credit to consumers which are secured by residential real estate. These loans are typically secured with second mortgages on the homes. Other consumer loans include installment loans used by customers to purchase automobiles, boats and recreational vehicles.

CREDIT QUALITY ASSESSMENT

CREDIT QUALITY ASSESSMENT	9 Months Ended
	Sep. 30, 2020
Credit Loss [Abstract]
CREDIT QUALITY ASSESSMENT	CREDIT QUALITY ASSESSMENT The Company completed the implementation of the CECL standard during the first quarter of 2020. The new guidance requires additional disclosures and introduces certain changes to definitions previously used under allowance for loan losses guidance. Accordingly, the following sections present separate disclosures compliant with the new and the legacy disclosure requirements. Allowance for Credit Losses Summary information on the allowance for credit loss activity for the period indicated is provided in the following table: Nine Months Ended September 30, (In thousands) 2020 2019 Balance at beginning of period $ 56,132 $ 53,486 Initial allowance on PCD loans at adoption of ASC 326 2,762 — Transition impact of adopting ASC 326 2,983 — Initial allowance on acquired Revere PCD loans 18,628 — Provision for credit losses 90,158 3,029 Loan charge-offs (1,255) (2,101) Loan recoveries 906 578 Net charge-offs (349) (1,523) Balance at period end $ 170,314 $ 54,992 The following table provides summary information regarding collateral dependent loans individually evaluated for credit loss at the dates indicated: (In thousands) September 30, 2020 December 31, 2019 Collateral dependent loans individually evaluated for credit loss with an allowance $ 25,823 $ 15,333 Collateral dependent loans individually evaluated for credit loss without an allowance 30,299 9,440 Total individually evaluated collateral dependent loans $ 56,122 $ 24,773 Allowance for credit losses related to loans evaluated individually $ 8,263 $ 5,501 Allowance for credit losses related to loans evaluated collectively 162,051 50,631 Total allowance for credit losses $ 170,314 $ 56,132 The below section presents allowance for credit losses disclosures in line with the new CECL disclosure requirements. The following table provides information on the activity in the allowance for credit losses by the respective loan portfolio segment for the period indicated: For the Nine Months Ended September 30, 2020 Commercial Real Estate Residential Real Estate (Dollars in thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Balance at beginning of period $ 18,407 $ 6,884 $ 7,590 $ 11,395 $ 8,803 $ 967 $ 2,086 $ 56,132 Initial allowance on PCD loans at adoption of ASC 326 1,114 — — 1,549 — — 99 2,762 Transition impact of adopting ASC 326 (3,125) 387 2,576 2,988 (388) (275) 820 2,983 Initial allowance on acquired Revere PCD loans 7,973 2,782 1,248 6,289 243 6 87 18,628 Provision for credit losses 30,884 9,600 7,377 34,671 3,595 761 3,270 90,158 Charge-offs (23) — — (429) (420) — (383) (1,255) Recoveries 6 — — 696 78 5 121 906 Net recoveries (charge-offs) (17) — — 267 (342) 5 (262) (349) Balance at end of period $ 55,236 $ 19,653 $ 18,791 $ 57,159 $ 11,911 $ 1,464 $ 6,100 $ 170,314 Total loans $ 3,588,702 $ 1,652,208 $ 994,800 $ 2,227,246 $ 1,173,857 $ 175,123 $ 521,999 $ 10,333,935 Allowance for credit losses to total loans ratio 1.54 % 1.19 % 1.89 % 2.57 % 1.01 % 0.84 % 1.17 % 1.65 % Balance of loans individually evaluated for credit loss $ 27,508 $ 6,511 $ 1,678 $ 18,728 $ 1,333 $ — $ 364 $ 56,122 Allowance related to loans evaluated individually $ 2,537 $ 22 $ 603 $ 5,101 $ — $ — $ — $ 8,263 Individual allowance to loans evaluated individually ratio 9.22 % 0.34 % 35.94 % 27.24 % — % — — 14.72 % Balance of loans collectively evaluated for credit loss $ 3,561,194 $ 1,645,697 $ 993,122 $ 2,208,518 $ 1,172,524 $ 175,123 $ 521,635 $ 10,277,813 Allowance related to loans evaluated collectively $ 52,699 $ 19,631 $ 18,188 $ 52,058 $ 11,911 $ 1,464 $ 6,100 $ 162,051 Collective allowance to loans evaluated collectively ratio 1.48 % 1.19 % 1.83 % 2.36 % 1.02 % 0.84 % 1.17 % 1.58 % The following table presents collateral dependent loans individually evaluated for credit loss with the associated allowances for credit losses by the applicable portfolio segment: September 30, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Loans individually evaluated for credit loss with an allowance: Non-accruing $ 14,267 $ — $ 1,678 $ 6,112 $ — $ — $ — $ 22,057 Restructured accruing — — — 938 — — — 938 Restructured non-accruing 724 853 — 1,251 — — — 2,828 Balance $ 14,991 $ 853 $ 1,678 $ 8,301 $ — $ — $ — $ 25,823 Allowance $ 2,537 $ 22 $ 603 $ 5,101 $ — $ — $ — $ 8,263 Loans individually evaluated for credit loss without an allowance: Non-accruing $ 11,417 $ 4,194 $ — $ 10,007 $ — $ — $ — $ 25,618 Restructured accruing 724 — — 131 1,061 — — 1,916 Restructured non-accruing 376 1,464 — 289 272 — 364 2,765 Balance $ 12,517 $ 5,658 $ — $ 10,427 $ 1,333 $ — $ 364 $ 30,299 Total individually evaluated loans: Non-accruing $ 25,684 $ 4,194 $ 1,678 $ 16,119 $ — $ — $ — $ 47,675 Restructured accruing 724 — — 1,069 1,061 — — 2,854 Restructured non-accruing 1,100 2,317 — 1,540 272 — 364 5,593 Balance $ 27,508 $ 6,511 $ 1,678 $ 18,728 $ 1,333 $ — $ 364 $ 56,122 Total unpaid contractual principal balance $ 33,452 $ 10,203 $ 1,678 $ 27,171 $ 2,683 $ — $ 364 $ 75,551 The following table presents average principal balance of total non-accrual loans, contractual interest due and interest income recognized on a cash basis on non-accrual loans for the periods indicated below: September 30, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Average non-accrual loans for the period $ 22,254 $ 5,366 $ 1,573 $ 14,932 $ 11,990 $ — $ 6,497 $ 62,612 Contractual interest income due on non- accrual loans during the period $ 1,496 $ 368 $ 67 $ 750 $ 447 $ — $ 292 $ 3,420 There was no interest income recognized on non-accrual loans during the nine months ended September 30, 2020. See Note 1 for additional information on the Company's policies for non-accrual loans. Loans designated as non-accrual have all previously accrued but unpaid interest reversed from interest income. During the nine months ended September 30, 2020 new loans placed on non-accrual status totaled $30.5 million and the related amount of reversed uncollected accrued interest was $0.3 million. The below section presents historical allowance for loan losses disclosures in line with the legacy disclosure requirements. The following table provides information on the activity in the allowance for loan losses by the respective loan portfolio segment for the period indicated: For the Year Ended December 31, 2019 Commercial Real Estate Residential Real Estate (Dollars in thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Balance at beginning of period $ 17,603 $ 6,307 $ 5,944 $ 11,377 $ 8,881 $ 1,261 $ 2,113 $ 53,486 Provision (credit) 788 577 1,418 1,164 474 (302) 565 4,684 Charge-offs — — — (1,195) (690) — (783) (2,668) Recoveries 16 — 228 49 138 8 191 630 Net recoveries (charge-offs) 16 — 228 (1,146) (552) 8 (592) (2,038) Balance at end of period $ 18,407 $ 6,884 $ 7,590 $ 11,395 $ 8,803 $ 967 $ 2,086 $ 56,132 Total loans $ 2,169,156 $ 1,288,677 $ 684,010 $ 801,019 $ 1,149,327 $ 146,279 $ 466,764 $ 6,705,232 Allowance for loan losses to total loans ratio 0.85 % 0.53 % 1.11 % 1.42 % 0.77 % 0.66 % 0.45 % 0.84 % Balance of loans specifically evaluated for impairment $ 9,212 $ 4,148 $ 829 $ 8,867 $ 1,717 $ — $ — $ 24,773 Allowance for loans specifically evaluated for impairment $ 1,529 $ 23 $ 132 $ 3,817 $ — $ — $ — $ 5,501 Specific allowance to specific loans ratio 16.60 % 0.55 % 15.92 % 43.05 % — — — 22.21 % Balance of loans collectively evaluated $ 2,150,400 $ 1,284,529 $ 683,181 $ 789,613 $ 1,147,602 $ 146,279 $ 465,771 $ 6,667,375 Allowance for loans collectively evaluated $ 16,878 $ 6,861 $ 7,458 $ 7,578 $ 8,803 $ 967 $ 2,086 $ 50,631 Collective allowance to collective loans ratio 0.78 % 0.53 % 1.09 % 0.96 % 0.77 % 0.66 % 0.45 % 0.76 % Balance of loans acquired with deteriorated credit quality $ 9,544 $ — $ — $ 2,539 $ 8 $ — $ 993 $ 13,084 Allowance for loans acquired with deteriorated credit quality $ — $ — $ — $ — $ — $ — $ — $ — Allowance to loan acquired with deteriorated credit quality ratio — — — — — — — — The following tables present the recorded investment with respect to impaired loans, the associated allowance by the applicable portfolio segment and the unpaid contractual principal balance of the impaired loans: December 31, 2019 Commercial Real Estate Total Recorded (In thousands) Commercial Commercial Commercial Commercial All Impaired loans with a specific allowance: Non-accruing $ 5,448 $ 767 $ 829 $ 5,608 $ — $ 12,652 Restructured accruing — — — 266 — 266 Restructured non-accruing 437 122 — 1,856 — 2,415 Balance $ 5,885 $ 889 $ 829 $ 7,730 $ — $ 15,333 Allowance $ 1,529 $ 23 $ 132 $ 3,817 $ — $ 5,501 Impaired loans without a specific allowance: Non-accruing $ 2,552 $ 1,522 $ — $ 114 $ — $ 4,188 Restructured accruing 775 — — 151 1,444 2,370 Restructured non-accruing — 1,737 — 872 273 2,882 Balance $ 3,327 $ 3,259 $ — $ 1,137 $ 1,717 $ 9,440 Total impaired loans: Non-accruing $ 8,000 $ 2,289 $ 829 $ 5,722 $ — $ 16,840 Restructured accruing 775 — — 417 1,444 2,636 Restructured non-accruing 437 1,859 — 2,728 273 5,297 Balance $ 9,212 $ 4,148 $ 829 $ 8,867 $ 1,717 $ 24,773 Unpaid principal balance in total impaired loans $ 13,805 $ 6,072 $ 829 $ 11,296 $ 2,618 $ 34,620 December 31, 2019 Commercial Real Estate Total Recorded (In thousands) Commercial Commercial Commercial Commercial All Average impaired loans for the period $ 7,565 $ 4,390 $ 2,052 $ 7,781 $ 1,577 $ 23,365 Contractual interest income due on impaired loans during the period $ 786 $ 258 $ 127 $ 648 $ 128 $ 1,947 Interest income on impaired loans recognized on an accrual basis $ 39 $ — $ — $ 62 $ 68 $ 169 Credit Quality The following section provides information on the credit quality of the loan portfolio under the new CECL disclosure requirements: For the Nine Months Ended September 30, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Analysis of non-accrual loan activity: Balance at beginning of period $ 8,437 $ 4,148 $ 829 $ 8,450 $ 12,661 $ — $ 4,107 $ 38,632 PCD loans designated as non-accrual (1) 9,544 — — 2,539 8 — 993 13,084 Loans placed on non-accrual 9,437 3,425 2,128 10,988 896 — 3,677 30,551 Non-accrual balances transferred to OREO — — — — — — — — Non-accrual balances charged-off (23) — — (386) (351) — (121) (881) Net payments or draws (611) (961) (1,279) (3,052) (1,058) — (1,028) (7,989) Non-accrual loans brought current — (101) — (880) (860) — (135) (1,976) Balance at end of period $ 26,784 $ 6,511 $ 1,678 $ 17,659 $ 11,296 $ — $ 7,493 $ 71,421 (1) Upon the adoption of the CECL standard, the Company transitioned from closed pool level accounting for PCI loans during the first quarter of 2020. Non-accrual loans are determined based on the individual loan level and aggregated for reporting. September 30, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Performing loans: Current $ 3,555,815 $ 1,643,589 $ 991,086 $ 2,198,943 $ 1,155,016 $ 169,766 $ 507,336 $ 10,221,551 30-59 days 4,181 2,108 1,634 8,862 5,197 3,167 5,039 30,188 60-89 days 1,198 — 402 620 967 2,190 2,130 7,507 Total performing loans 3,561,194 1,645,697 993,122 2,208,425 1,161,180 175,123 514,505 10,259,246 Non-performing loans: Non-accrual loans 26,784 6,511 1,678 17,659 11,296 — 7,493 71,421 Loans greater than 90 days past due — — — 93 320 — 1 414 Restructured loans 724 — — 1,069 1,061 — — 2,854 Total non-performing loans 27,508 6,511 1,678 18,821 12,677 — 7,494 74,689 Total loans $ 3,588,702 $ 1,652,208 $ 994,800 $ 2,227,246 $ 1,173,857 $ 175,123 $ 521,999 $ 10,333,935 The credit quality indicators for commercial loans are developed through review of individual borrowers on an ongoing basis. Each borrower is evaluated at least annually with more frequent evaluation of more severely criticized loans. The indicators represent the rating for loans as of the date presented is based on the most recent credit review performed. These credit quality indicators are defined as follows: Pass - A pass rated credit is not adversely classified because it does not display any of the characteristics for adverse classification. Special mention – A special mention credit has potential weaknesses that deserve management’s close attention. If uncorrected, such weaknesses may result in deterioration of the repayment prospects or collateral position at some future date. Special mention assets are not adversely classified and do not warrant adverse classification. Substandard – A substandard loan is inadequately protected by the current net worth and payment capacity of the obligor or of the collateral pledged, if any. Loans classified as substandard generally have a well-defined weakness, or weaknesses, that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility of loss if the deficiencies are not corrected. Doubtful – A loan that is classified as doubtful has all the weaknesses inherent in a loan classified as substandard with added characteristics that the weaknesses make collection or liquidation in full highly questionable and improbable, on the basis of currently existing facts, conditions and values. Loss – Loans classified as a loss are considered uncollectible and of such little value that their continuing to be carried as a loan is not warranted. This classification is not necessarily equivalent to no potential for recovery or salvage value, but rather that it is not appropriate to defer a full write-off even though partial recovery may be effected in the future. The following table provides information about credit quality indicators by the year of origination: September 30, 2020 Term Loans by Origination Year Revolving (In thousands) 2020 2019 2018 2017 2016 Prior Loans Total Commercial Investor R/E: Pass $ 675,314 $ 799,088 $ 466,850 $ 501,591 $ 493,003 $ 566,433 $ 31,413 $ 3,533,692 Special Mention 5,049 1,617 19,026 232 271 1,873 — 28,068 Substandard 494 3,020 — 7,101 682 15,645 — 26,942 Doubtful — — — — — — — — Total $ 680,857 $ 803,725 $ 485,876 $ 508,924 $ 493,956 $ 583,951 $ 31,413 $ 3,588,702 Commercial Owner-Occupied R/E: Pass $ 207,879 $ 392,597 $ 248,942 $ 203,649 $ 209,218 $ 356,393 $ 1,812 $ 1,620,490 Special Mention 2,324 4,124 5,505 5,381 137 5,307 — 22,778 Substandard 493 870 788 465 222 5,863 — 8,701 Doubtful — — — — — 239 — 239 Total $ 210,696 $ 397,591 $ 255,235 $ 209,495 $ 209,577 $ 367,802 $ 1,812 $ 1,652,208 Commercial AD&C: Pass $ 356,246 $ 292,303 $ 169,833 $ 62,582 $ 6,711 $ 2,377 $ 83,756 $ 973,808 Special Mention 1,710 — — 13,658 — — — 15,368 Substandard 1,127 1,554 — 100 2,843 — — 5,624 Doubtful — — — — — — — — Total $ 359,083 $ 293,857 $ 169,833 $ 76,340 $ 9,554 $ 2,377 $ 83,756 $ 994,800 Commercial Business: Pass $ 1,190,428 $ 215,772 $ 149,231 $ 97,275 $ 37,641 $ 88,653 $ 410,116 $ 2,189,116 Special Mention 249 3,517 1,462 18 1,467 2,210 4,365 13,288 Substandard 2,050 3,242 3,287 1,713 2,353 2,070 1,708 16,423 Doubtful 114 1,042 950 36 1,309 1,987 2,981 8,419 Total $ 1,192,841 $ 223,573 $ 154,930 $ 99,042 $ 42,770 $ 94,920 $ 419,170 $ 2,227,246 Residential Mortgage: Beacon score: 660-850 $ 169,476 $ 69,350 $ 164,196 $ 207,953 $ 153,302 $ 285,639 $ — $ 1,049,916 600-659 4,235 11,924 12,136 13,559 9,753 24,752 — 76,359 540-599 321 1,833 5,089 2,722 3,507 9,270 — 22,742 less than 540 391 1,739 6,049 1,367 2,769 12,525 — 24,840 Total $ 174,423 $ 84,846 $ 187,470 $ 225,601 $ 169,331 $ 332,186 $ — $ 1,173,857 Residential Construction: Beacon score: 660-850 $ 79,897 $ 66,861 $ 19,900 $ 3,963 $ 1,736 $ — $ — $ 172,357 600-659 987 904 — — 369 — — 2,260 540-599 — — — — — — — — less than 540 506 — — — — — — 506 Total $ 81,390 $ 67,765 $ 19,900 $ 3,963 $ 2,105 $ — $ — $ 175,123 Consumer: Beacon score: 660-850 $ 2,561 $ 5,345 $ 5,327 $ 2,297 $ 2,772 $ 23,023 $ 420,848 $ 462,173 600-659 608 747 286 452 1,076 5,090 20,555 28,814 540-599 49 433 260 93 503 3,101 8,141 12,580 less than 540 742 521 608 1,053 761 3,113 11,634 18,432 Total $ 3,960 $ 7,046 $ 6,481 $ 3,895 $ 5,112 $ 34,327 $ 461,178 $ 521,999 Total loans $ 2,703,250 $ 1,878,403 $ 1,279,725 $ 1,127,260 $ 932,405 $ 1,415,563 $ 997,329 $ 10,333,935 The following section provides historical information on the credit quality of the loan portfolio under the legacy disclosure requirements: December 31, 2019 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Non-performing loans and assets: Non-accrual loans $ 8,437 $ 4,148 $ 829 $ 8,450 $ 12,661 $ — $ 4,107 $ 38,632 Loans 90 days past due — — — — — — — — Restructured loans 775 — — 417 1,080 — 364 2,636 Total non-performing loans 9,212 4,148 829 8,867 13,741 — 4,471 41,268 Other real estate owned 409 — 665 39 305 — 64 1,482 Total non-performing assets $ 9,621 $ 4,148 $ 1,494 $ 8,906 $ 14,046 $ — $ 4,535 $ 42,750 December 31, 2019 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Past due loans: 30-59 days $ 932 $ 316 $ — $ 908 $ 14,853 $ 280 $ 2,697 $ 19,986 60-89 days — — — 370 4,541 1,334 1,517 7,762 > 90 days — — — — — — — — Total past due 932 316 — 1,278 19,394 1,614 4,214 27,748 Non-accrual loans 8,437 4,148 829 8,450 12,661 — 4,107 38,632 Loans acquired with deteriorated credit quality 9,544 — — 2,539 8 — 993 13,084 Current loans 2,150,243 1,284,213 683,181 788,752 1,117,264 144,665 457,450 6,625,768 Total loans $ 2,169,156 $ 1,288,677 $ 684,010 $ 801,019 $ 1,149,327 $ 146,279 $ 466,764 $ 6,705,232 December 31, 2019 Commercial Real Estate (In thousands) Commercial Commercial Commercial Commercial Total Pass $ 2,146,971 $ 1,278,337 $ 683,181 $ 783,909 $ 4,892,398 Special Mention 3,189 2,284 — 2,487 7,960 Substandard 18,996 8,056 829 14,623 42,504 Doubtful — — — — — Total $ 2,169,156 $ 1,288,677 $ 684,010 $ 801,019 $ 4,942,862 December 31, 2019 Residential Real Estate (In thousands) Residential Residential Consumer Total Performing $ 1,135,586 $ 146,279 $ 462,293 $ 1,744,158 Non-performing: — 90 days past due — — — — Non-accruing 12,661 — 4,107 16,768 Restructured loans 1,080 — 364 1,444 Total $ 1,149,327 $ 146,279 $ 466,764 $ 1,762,370 The following table provides the amounts of the restructured loans at the date of restructuring for specific segments of the loan portfolio during the period indicated: For the Nine Months Ended September 30, 2020 Commercial Real Estate (In thousands) Commercial Commercial Commercial Commercial All Total Troubled debt restructurings: Restructured accruing $ — $ — $ — $ 322 $ — $ 322 Restructured non-accruing 723 930 — 808 — 2,461 Balance $ 723 $ 930 $ — $ 1,130 $ — $ 2,783 Specific allowance $ 49 $ 19 $ — $ 867 $ — $ 935 Restructured and subsequently defaulted $ — $ — $ — $ — $ — $ — For the Year Ended December 31, 2019 Commercial Real Estate (In thousands) Commercial Commercial Commercial Commercial All Total Troubled debt restructurings: Restructured accruing $ 775 $ — $ — $ 170 $ 364 $ 1,309 Restructured non-accruing 789 — — 261 — 1,050 Balance $ 1,564 $ — $ — $ 431 $ 364 $ 2,359 Specific allowance $ 205 $ — $ — $ 196 $ — $ 401 Restructured and subsequently defaulted $ — $ — $ — $ — $ — $ — During the nine months ended September 30, 2020, the Company restructured $2.8 million in loans that were designated as TDRs. TDRs are subject to periodic credit reviews to determine the necessity and adequacy of an individual loan loss allowance based on the collectability of the recorded investment in the restructured loan. Loans restructured as TDRs during the nine months ended September 30, 2020 had individual reserves of $0.9 million. For the year ended December 31, 2019, the Company restructured $2.4 million in loans. Loans restructured as TDRs during 2019 had individual reserves of $0.4 million at December 31, 2019. During both the nine months ended September 30, 2020 and for the year ended December 31, 2019 TDR modifications consisted principally of interest rate concessions, and did not result in the reduction of the recorded investment in the associated loan balances. The commitments to lend additional funds on loans that have been restructured at September 30, 2020 and December 31, 2019 were not significant. Other Real Estate Owned Other real estate owned ("OREO") totaled $1.4 million and $1.5 million at September 30, 2020 and December 31, 2019, respectively. There was one consumer mortgage loan secured by residential real estate property in the total amount of $0.1 million for which formal foreclosure proceedings were in process as of September 30, 2020.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS The gross carrying amounts and accumulated amortization of intangible assets and goodwill are presented at the dates indicated in the following table: September 30, 2020 Weighted December 31, 2019 Weighted (Dollars in thousands) Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets: Core deposit intangibles $ 29,038 $ (6,841) $ 22,197 8.7 years $ 10,678 $ (3,689) $ 6,989 8.0 years Other identifiable intangibles 13,906 (1,928) 11,978 10.9 years 1,478 (626) 852 9.7 years Total amortizing intangible assets $ 42,944 $ (8,769) $ 34,175 $ 12,156 $ (4,315) $ 7,841 Goodwill $ 370,549 $ 370,549 $ 347,149 $ 347,149 The table above reflects an additional $18.4 million in core deposit intangible asset related to the Revere acquisition that is amortizing over 9.67 years. The amount of goodwill by reportable segment is presented in the following table: (In thousands) Community Insurance Investment Total Balance December 31, 2019 $ 331,173 $ 6,788 $ 9,188 $ 347,149 Acquisition of Rembert Pendleton Jackson — — 22,559 22,559 Acquisition of Revere Bank 841 — — 841 Balance September 30, 2020 $ 332,014 $ 6,788 $ 31,747 $ 370,549 The table above includes the estimated amount of goodwill resulting from the Revere acquisition that was recorded as of September 30, 2020. See Note 2 for additional information on the Revere acquisition. The following table presents the estimated future amortization expense for amortizing intangible assets within the years ending December 31: (In thousands) Amount Remaining for 2020 $ 1,654 2021 6,600 2022 5,845 2023 5,089 2024 4,333 Thereafter 10,654 Total amortizing intangible assets $ 34,175

DEPOSITS

DEPOSITS	9 Months Ended
	Sep. 30, 2020
Deposits [Abstract]
DEPOSITS	DEPOSITS The following table presents the composition of deposits at the dates indicated: (In thousands) September 30, 2020 December 31, 2019 Noninterest-bearing deposits $ 3,458,804 $ 1,892,052 Interest-bearing deposits: Demand 1,137,000 836,433 Money market savings 3,104,600 1,839,593 Regular savings 396,280 329,919 Time deposits of less than $100,000 545,903 463,431 Time deposits of $100,000 or more 1,322,382 1,078,891 Total interest-bearing deposits 6,506,165 4,548,267 Total deposits $ 9,964,969 $ 6,440,319

BORROWINGS

BORROWINGS	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Borrowings	BORROWINGS Subordinated Debt On November 5, 2019, the Company completed an offering of $175.0 million aggregate principal amount Fixed to Floating Rate Subordinated Notes due in 2029. The notes bear a fixed interest rate of 4.25% per year through November 14, 2024. Beginning November 15, 2024, the interest rate will become a floating rate equal to three month LIBOR, or an alternative benchmark rate as determined pursuant to the terms of the indenture for the notes in the event LIBOR has been discontinued by November 15, 2024, plus 262 basis points through the remaining maturity or early redemption date of the notes. The interest will be paid in arrears semi-annually during the fixed rate period and quarterly during the floating rate period. The Company incurred $2.9 million of debt issuance costs which are being amortized through the contractual life of the debt. The entire amount of the subordinated debt is considered Tier 2 capital under current regulatory guidelines. In conjunction with the acquisition of WashingtonFirst Bankshares, Inc. ("WashingtonFirst"), the Company assumed $25.0 million in subordinated debt with an associated purchase premium at acquisition of $2.2 million, which will be amortized over the contractual life of the obligation. The subordinated debt has a ten year term, maturing on October 15, 2025, is non-callable until October 15, 2020 and currently bears a fixed interest rate of 6.00% per annum, payable semi-annually. Beginning on October 5, 2020, the interest rate resets quarterly to an amount equal to 3 month LIBOR plus 467 basis points. The entire amount of the subordinated debt is considered Tier 2 capital under current regulatory guidelines. Also in conjunction with the acquisition of WashingtonFirst, the Company assumed $10.3 million in callable junior subordinated debt securities with an associated purchase premium at acquisition of $0.1 million that will amortize over the contractual life of the obligation. During the first quarter of 2020, the Company redeemed all $10.3 million of the outstanding principal balance of the callable junior subordinated debt securities. In conjunction with the acquisition of Revere, the Company assumed $31.0 million in subordinated debt with an associated purchase premium at acquisition of $0.2 million, which will be amortized through the call date. The subordinated debt has a ten year term, maturing on September 30, 2026, is non-callable until September 30, 2021, and currently bears a fixed interest rate of 5.625% per annum, payable semi-annually. Beginning on October 1, 2021, the interest rate resets quarterly to an amount equal to 3 month LIBOR plus 441 basis points. The entire amount of the subordinated debt is considered Tier 2 capital under current regulatory guidelines. The following table provides information on subordinated debt as of the date indicated: (In thousands) September 30, 2020 December 31, 2019 Fixed to floating rate sub debt, 4.25% $ 175,000 $ 175,000 WashingtonFirst sub debt, 6.00% 25,000 25,000 Revere fixed to floating rate sub debt, 5.625% 31,000 — Total Sub debt 231,000 200,000 Add: Purchase accounting premium 1,954 1,894 Less: Debt issuance costs (2,654) (2,885) Net sub debt 230,300 199,009 WashingtonFirst callable junior subordinated debt — 10,310 Add: Purchase accounting premium — 87 Net WashingtonFirst callable junior subordinated debt — 10,397 Long-term borrowings $ 230,300 $ 209,406 Other Borrowings At September 30, 2020 and December 31, 2019, the Company had $142.3 million and $138.6 million, respectively, of outstanding retail repurchase agreements. The Company had $70.0 million and $75.0 million of outstanding federal funds purchased at September 30, 2020 and December 31, 2019, respectively. During the quarter ended September 30, 2020, the Company repaid $594.6 million of Paycheck Protection Program Liquidity Facility ("PPPLF") borrowings, which were used to fund PPP loans issued during the prior quarter. At September 30, 2020, $250.4 million in PPPLF borrowings remained outstanding. The Company had $837.7 million available to borrow under the PPPLF at September 30, 2020. Amounts borrowed under the PPPLF are required to be repaid as the Company’s PPP loans are repaid or forgiven. At September 30, 2020 and December 31, 2019, the Company had $444.2 million and $513.8 million, respectively, of advances from the Federal Home Loan Bank of Atlanta (“FHLB”). During the second quarter of 2020, the Company assumed $168.4 million of FHLB advances in connection with the acquisition of Revere, with a fair value premium of $5.8 million recorded at acquisition. During the quarter ended June 30, 2020, the Company prepaid $115.4 million of the acquired advances and recognized a prepayment penalty of $5.9 million, which was reflected in Other expenses in the Condensed Consolidated Statements of Income. Also in connection with the prepayment, the Company recognized the remaining unamortized fair value premium of $5.8 million on those prepaid advances, which was reflected in Interest on advances from FHLB in the Condensed Consolidated Statements of Income. The remaining $53.0 million of acquired Revere FHLB advances, which were not prepaid, matured during the quarter ended June 30, 2020.

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY	9 Months Ended
	Sep. 30, 2020
Stockholders' Equity Note [Abstract]
STOCKHOLDERS' EQUITY	STOCKHOLDERS' EQUITY The Company’s Board of Directors approved a stock repurchase plan in December 2018 that permits the repurchase of up to 1,800,000 shares of common stock. For the nine months ended September 30, 2020, the Company repurchased and retired 820,328 shares of its common stock at an average price of $31.33 per share. The Company did not repurchase shares during the three months ended September 30, 2020. Cumulatively under the program, as of September 30, 2020, the Company has repurchased and retired 1,488,519 common shares for the total cost of $50.0 million under the current repurchase plan. On April 1, 2020, to facilitate the acquisition of Revere and as previously approved by the Company’s Board of Directors, the Company issued an additional 12,768,949 shares of the Company’s common stock at $22.64 per share. See to Note 2 for additional information on the acquisition of Revere.

SHARE BASED COMPENSATION

SHARE BASED COMPENSATION	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
SHARE BASED COMPENSATION	SHARE BASED COMPENSATION At September 30, 2020, the Company had two share based compensation plans in existence, the 2005 Omnibus Stock Plan (“Omnibus Stock Plan”) and the 2015 Omnibus Incentive Plan (“Omnibus Incentive Plan”). The Omnibus Stock Plan expired during the second quarter of 2015 but has outstanding options that may still be exercised. The Omnibus Incentive Plan is described in the following paragraph. The Company’s Omnibus Incentive Plan was approved on May 6, 2015 and provides for the granting of incentive stock options, non-qualifying stock options, stock appreciation rights, restricted stock grants, restricted stock units and performance share units to selected directors and employees on a periodic basis at the discretion of the Company’s Board of Directors. The Omnibus Incentive Plan authorizes the issuance of up to 1,500,000 shares of common stock, of which 908,499 are available for issuance at September 30, 2020, has a term of ten years, and is administered by a committee of at least three directors appointed by the Board of Directors. Options granted under the plan have an exercise price which may not be less than 100% of the fair market value of the common stock on the date of the grant and must be exercised within seven The dividend yield is based on estimated future dividend yields. The risk-free rate for periods within the contractual term of the share option is based on the U.S. Treasury yield curve in effect at the time of the grant. Expected volatilities are generally based on historical volatilities. The expected term of share options granted is generally derived from historical experience. Compensation expense is recognized on a straight-line basis over the vesting period of the respective stock option, restricted stock, restricted stock unit grant or performance share units. The Company recognized compensation expense of $1.0 million and $0.7 million for the three months ended September 30, 2020 and 2019, respectively, and of $2.8 million and $2.1 million, for the nine months ended September 30, 2020 and 2019, respectively, related to the awards of stock options, restricted stock grants, restricted stock unit grants and performance share unit grants. The total of unrecognized compensation cost related to stock options was not significant as of September 30, 2020, and is expected to be recognized within one year. The fair value of the options vested during the nine months ended September 30, 2020 and 2019, was $0.1 million and $0.2 million, respectively. The total of unrecognized compensation cost related to restricted stock awards, restricted stock unit grants, and performance share unit grants was approximately $9.1 million as of September 30, 2020. That cost is expected to be recognized over a weighted average period of approximately 2.8 years. The Company did not grant restricted shares, restricted stock units and performance share units during the three months ended September 30, 2020. During the nine months ended September 30, 2020, the Company granted 246,015 restricted shares, restricted stock units and performance share units, of which 44,905 units are subject to achievement of certain performance conditions measured over a three year performance period and 201,110 of restricted shares or units subject to a three- or five-year vesting schedule. The Company issued 395,298 stock options at a weighted average grant-date fair value of $9.14 during the second quarter of 2020, due to a conversion of stock options held prior to the Acquisition Date by Revere employees. The fair value of the options issued were considered part of the consideration transferred and were therefore recorded as an adjustment to goodwill. See Note 2 for additional information on the acquisition of Revere. The Company did not grant any stock options under the Omnibus Incentive Plan during the three or nine months ended September 30, 2020 A summary of share option activity for the period indicated is reflected in the following table: Number Weighted Weighted Aggregate Balance at Balance at January 1, 2020 65,279 $ 31.34 $ 485 Granted — $ — Converted options from Revere acquisition 395,298 $ 12.27 Exercised (10,213) $ 16.07 $ 123 Forfeited (765) $ 39.02 Expired (703) $ 28.26 Balance at September 30, 2020 448,896 $ 14.89 3.1 $ 4,383 Exercisable at September 30, 2020 444,132 $ 14.64 3.1 $ 4,383 A summary of the activity for the Company’s restricted stock, restricted stock units and performance share units for the period indicated is presented in the following table: Number Weighted Non-vested at Non-vested at January 1, 2020 226,502 $ 35.43 Granted 246,015 $ 25.82 Vested (66,533) $ 34.38 Forfeited/ cancelled (9,363) $ 43.71 Non-vested at September 30, 2020 396,621 $ 29.45

PENSION PLAN

PENSION PLAN	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
PENSION PLAN	PENSION PLAN Defined Benefit Pension Plan The Company has a qualified, noncontributory, defined benefit pension plan (the “Plan”). Benefits after January 1, 2005, are based on the benefit earned as of December 31, 2004, plus benefits earned in future years of service based on the employee’s compensation during each such year. All benefit accruals for employees were frozen as of December 31, 2007 based on past service and thus salary increases and additional years of service after such date no longer affect the defined benefit provided by the Plan, although additional vesting may continue to occur. The Company's funding policy is to contribute amounts to the Plan sufficient to meet the minimum funding requirements of the Employee Retirement Income Security Act of 1974 (“ERISA”), as amended. In addition, the Company contributes additional amounts as it deems appropriate based on benefits attributed to service prior to the date of the Plan freeze. The Plan invests primarily in a diversified portfolio of managed fixed income and equity funds. The components of net periodic benefit cost for the periods indicated are presented in the following table: Three Months Ended September 30, Nine Months Ended September 30, (In thousands) 2020 2019 2020 2019 Interest cost on projected benefit obligation $ 359 $ 403 $ 1,078 $ 1,207 Expected return on plan assets (456) (412) (1,368) (1,236) Recognized net actuarial loss 219 264 656 794 Net periodic benefit cost $ 122 $ 255 $ 366 $ 765 The decision as to whether or not to make a plan contribution and the amount of any such contribution is dependent on a number of factors. Such factors include the investment performance of Plan assets in the current economy and, since the Plan is currently frozen, the remaining investment horizon of the Plan. After consideration of these factors, the Company has not made a contribution during the nine months ended September 30, 2020. Management continues to monitor the funding level of the Plan and may make additional contributions as necessary during 2020.

NET INCOME PER COMMON SHARE

NET INCOME PER COMMON SHARE	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
NET INCOME PER COMMON SHARE	NET INCOME PER COMMON SHARE The calculation of net income per common share for the periods indicated is presented in the following table: Three Months Ended September 30, Nine Months Ended September 30, (Dollars and amounts in thousands, except per share data) 2020 2019 2020 2019 Net income $ 44,642 $ 29,383 $ 40,291 $ 87,976 Distributed and undistributed earnings allocated to 373 186 317 570 Net income attributable to common shareholders $ 44,269 $ 29,197 $ 39,974 $ 87,406 Total weighted average outstanding shares 47,415 35,850 43,261 35,829 Less: Weighted average participating securities 397 228 355 237 Basic weighted average common shares 47,018 35,622 42,906 35,592 Dilutive weighted average common stock equivalents 157 50 165 50 Diluted weighted average common shares 47,175 35,672 43,071 35,642 Basic net income per common share $ 0.94 $ 0.82 $ 0.93 $ 2.46 Diluted net income per common share $ 0.94 $ 0.82 $ 0.93 $ 2.45 Anti-dilutive shares 37 8 22 10

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME/ (LOSS)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME/ (LOSS)	ACCUMULATED OTHER COMPREHENSIVE INCOME/ (LOSS) Comprehensive income/ (loss) is defined as net income/ (loss) plus transactions and other occurrences that are the result of non-owner changes in equity. For Condensed Consolidated Financial Statements presented for the Company, non-owner changes in equity are comprised of unrealized gains or losses on investments available-for-sale and any minimum pension liability adjustments. The following table presents the activity in net accumulated other comprehensive income/ (loss) and the components of the activity for the periods indicated: (In thousands) Unrealized Gains Defined Benefit Total Balance at January 1, 2020 $ 4,000 $ (8,332) $ (4,332) Other comprehensive income before reclassification, net of tax 21,650 — 21,650 Reclassifications from accumulated other comprehensive income, net of tax (322) 497 175 Current period change in other comprehensive income, net of tax 21,328 497 21,825 Balance at September 30, 2020 $ 25,328 $ (7,835) $ 17,493 (In thousands) Unrealized Gains/ Defined Benefit Total Balance at January 1, 2019 $ (6,630) $ (9,124) $ (15,754) Other comprehensive income before reclassification, net of tax 12,475 — 12,475 Reclassifications from accumulated other comprehensive income, net of tax (15) 586 571 Current period change in other comprehensive income, net of tax 12,460 586 13,046 Balance at September 30, 2019 $ 5,830 $ (8,538) $ (2,708) The following table provides the information on the reclassification adjustments out of accumulated other comprehensive income/ (loss) for the periods indicated: Nine Months Ended September 30, (In thousands) 2020 2019 Unrealized gains on investments available-for-sale: Affected line item in the Statements of Income: Investment securities gains $ 432 $ 20 Income before taxes 432 20 Tax expense (110) (5) Net income $ 322 $ 15 Amortization of defined benefit pension plan items: Affected line item in the Statements of Income: Recognized actuarial loss (1) $ (656) $ (794) Loss before taxes (656) (794) Tax benefit 159 208 Net loss $ (497) $ (586) (1) This amount is included in the computation of net periodic benefit cost. See Note 11 for additional information on the pension plan.

LEASES

LEASES	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
LEASES	LEASES The Company leases real estate properties for its network of bank branches, financial centers and corporate offices. All of the Company’s leases are currently classified as operating. Most lease agreements include one or more options to renew, with renewal terms that can extend the original lease term from one The following table provides information regarding the Company's leases as of the dates indicated: Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Components of lease expense: Operating lease cost (resulting from lease payments) $ 3,154 $ 2,912 $ 9,281 $ 8,605 Supplemental cash flow information related to leases: Operating cash flows from operating leases $ 4,158 $ 2,349 $ 10,160 $ 6,653 ROU assets obtained in the exchange for lease New leases $ — $ — $ — $ — Acquisitions $ — $ — $ 7,720 $ — September 30, 2020 December 31, 2019 Supplemental balance sheet information related to leases: Operating lease ROU assets $ 67,554 $ 69,320 Operating lease liabilities $ 77,506 $ 76,871 Other information related to leases: Weighted average remaining lease term of operating leases 9.6 years 10.4 years Weighted average discount rate of operating leases 3.10% 3.28% The Company added two locations from the acquisition of RPJ during the first quarter of 2020. The associated new ROU assets obtained in exchange for lease obligations totaled $0.3 million. On April 1, 2020, in conjunction with the acquisition of Revere, the Company added 15 additional operating leases (at 12 locations), one of which is expected to commence operations in 2021. The associated new ROU assets of $7.4 million obtained in exchange for lease obligations of $8.7 million was recorded at the close of the acquisition. The ROU assets recorded at acquisition included $1.1 million for acquisition related unfavorable fair value marks and a tenant allowance of $0.2 million. During the three months ended June 30, 2020, subsequent to and resulting from the acquisition, the Company determined that due to market overlap and other synergies, the Company would more-likely-than-not terminate seven of the acquired leases, comprised of six branch locations and one office space location. The decision resulted in an impairment charge of $2.3 million, which was recorded to Merger and acquisition expense in the Condensed Consolidated Statements of Income during the second quarter of 2020. The Company estimated the fair value of the leases to be equal to the cash payments remaining between the impairment date and the anticipated abandonment date. At September 30, 2020, the maturities of the Company’s operating lease liabilities were as follows: (In thousands) Amount Maturity: Remaining for 2020 $ 3,280 2021 12,634 2022 11,029 2023 10,882 2024 9,064 Thereafter 44,407 Total undiscounted lease payments 91,296 Less: Present value discount (13,790) Lease Liability $ 77,506 The Company recognized a lease liability of $2.1 million and ROU asset of $1.4 million for one additional operating lease that has not yet commenced operations at September 30, 2020, and is expected to commence operations in 2021. This ROU asset includes approximately $0.2 million of tenant allowance for improvements to the space and $0.5 million for an acquisition

DERIVATIVES

DERIVATIVES	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES	DERIVATIVESThe Company has entered into interest rate swaps (“swaps”) to facilitate customer transactions and meet their financing needs. These swaps qualify as derivatives, but are not designated as hedging instruments. Interest rate swap contracts involve the risk of dealing with counterparties and their ability to meet contractual terms. When the fair value of a derivative instrument contract is positive, this generally indicates that the counterparty or customer owes the Company and results in credit risk to the Company. When the fair value of a derivative instrument contract is negative, the Company owes the customer or counterparty and, therefore, has no credit risk. The notional value of the swaps outstanding was $240.1 million with a fair value of $10.2 million as of September 30, 2020 compared to $204.7 million with a fair value of $2.5 million as of December 31, 2019. The swap positions are offset to minimize the potential impact on the Company’s Condensed Consolidated Financial Statements. Fair values of the swaps are carried as both gross assets and gross liabilities in other assets and other liabilities, respectively, in the Condensed Consolidated Statements of Condition. The associated net gains and losses on the swaps are recorded in Other income in the Condensed Consolidated Statements of Income.

LITIGATION

LITIGATION	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
LITIGATION	LITIGATIONThe Company and its subsidiaries are subject in the ordinary course of business to various pending or threatened legal proceedings in which claims for monetary damages are asserted. After consultation with legal counsel, management does not anticipate that the ultimate liability, if any, arising out of these legal matters will have a material adverse effect on the Company's financial condition, operating results or liquidity.

FAIR VALUE

FAIR VALUE	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE	FAIR VALUE GAAP provides entities the option to measure eligible financial assets, financial liabilities and commitments at fair value (i.e. the fair value option), on an instrument-by-instrument basis, that are otherwise not permitted to be accounted for at fair value under other accounting standards. The election to use the fair value option is available when an entity first recognizes a financial asset or financial liability or upon entering into a commitment. Subsequent changes in fair value must be recorded in earnings. The Company applies the fair value option on residential mortgage loans held for sale. The fair value option on residential mortgage loans held for sale allows the recognition of gains on the sale of mortgage loans to more accurately reflect the timing and economics of the transaction. The standard for fair value measurement establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below. Basis of Fair Value Measurement: Level 1- Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2- Quoted prices in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; Level 3- Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e. supported by little or no market activity). A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Changes to interest rates may result in changes in the cash flows due to prepayments or extinguishments. Accordingly, changes to interest rates could result in higher or lower measurements of the fair values. Assets and Liabilities Residential mortgage loans held for sale Residential mortgage loans held for sale are valued based on quotations from the secondary market for similar instruments and are classified as Level 2 in the fair value hierarchy. Investments available-for-sale U.S. treasuries and government agencies securities and mortgage-backed and asset-backed securities Valuations are based on active market data and use of evaluated broker pricing models that vary based by asset class and includes available trade, bid, and other market information. Generally, the methodology includes broker quotes, proprietary models, descriptive terms, and databases coupled with extensive quality control programs. Quality control evaluation processes use available market, credit and deal level information to support the evaluation of the security. Additionally, proprietary models and pricing systems, mathematical tools, actual transacted prices, integration of market developments and experienced evaluators are used to determine the value of a security based on a hierarchy of market information regarding a security or securities with similar characteristics. The Company does not adjust the quoted price for such securities. Such instruments are classified within Level 2 in the fair value hierarchy. State and municipal securities The Company primarily uses prices obtained from third-party pricing services to determine the fair value of securities. The Company independently evaluates and corroborates the fair value received from pricing services through various methods and techniques, including references to dealer or other market quotes, by reviewing valuations of comparable instruments, and by comparing the prices realized on the sale of similar securities. Such securities are classified within Level 2 in the fair value hierarchy. Corporate debt The fair value of corporate debt is determined by utilizing a discounted cash flow valuation technique employed by a third-party valuation specialist. The third-party specialist uses assumptions related to yield, prepayment speed, conditional default rates and loss severity based on certain factors such as, credit worthiness of the counterparty, prevailing market rates, and analysis of similar securities. The Company evaluates the fair values provided by the third-party specialist for reasonableness and classifies them as level 3 in the fair value hierarchy. Interest rate swap agreements Interest rate swap agreements are measured by alternative pricing sources using a discounted cash flow method that incorporates current market interest rates. Based on the complex nature of interest rate swap agreements, the markets these instruments trade in are not as efficient and are less liquid than that of the more mature Level 1 markets. These characteristics classify interest rate swap agreements as Level 2 in the fair value hierarchy. Assets Measured at Fair Value on a Recurring Basis The following tables set forth the Company’s financial assets and liabilities at the dates indicated that were accounted for or disclosed at fair value. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement: September 30, 2020 Quoted Prices in Significant Other Significant (In thousands) (Level 1) (Level 2) (Level 3) Total Assets: Residential mortgage loans held for sale (1) $ — $ 88,728 $ — $ 88,728 Investments available-for-sale: U.S. treasuries and government agencies — 139,405 — 139,405 State and municipal — 352,987 — 352,987 Mortgage-backed and asset-backed — 852,314 — 852,314 Corporate debt — — 12,499 12,499 Total investments available-for-sale — 1,344,706 12,499 1,357,205 Interest rate swap agreements — 10,223 — 10,223 Total assets $ — $ 1,443,657 $ 12,499 $ 1,456,156 Liabilities: Interest rate swap agreements $ — $ (10,223) $ — $ (10,223) Total liabilities $ — $ (10,223) $ — $ (10,223) (1) The outstanding principal balance for residential loans held for sale as of September 30, 2020 was $85.8 million. December 31, 2019 Quoted Prices in Significant Other Significant (In thousands) (Level 1) (Level 2) (Level 3) Total Assets: Residential mortgage loans held for sale $ — $ 53,701 $ — $ 53,701 Investments available-for-sale: U.S. treasuries and government agencies — 258,495 — 258,495 State and municipal — 233,649 — 233,649 Mortgage-backed and asset-backed — 570,759 — 570,759 Corporate debt — — 9,552 9,552 Trust preferred — — 310 310 Total debt securities — 1,062,903 9,862 1,072,765 Marketable equity securities — 568 — 568 Total investments available-for-sale — 1,063,471 9,862 1,073,333 Interest rate swap agreements — 2,507 — 2,507 Total assets $ — $ 1,119,679 $ 9,862 $ 1,129,541 Liabilities: Interest rate swap agreements $ — $ (2,507) $ — $ (2,507) Total liabilities $ — $ (2,507) $ — $ (2,507) (1) The outstanding principal balance for residential loans held for sale as of December 31, 2019 was $52.6 million. The following table provides a change in the fair value of assets measured in the Condensed Consolidated Statements of Condition at fair value with significant unobservable inputs (Level 3) on a recurring basis for the period indicated: Significant (In thousands) (Level 3) Investments available-for-sale: Balance at January 1, 2020 $ 9,862 Additions of Level 3 assets 3,050 Sales of Level 3 assets (349) Total unrealized loss included in other comprehensive income/ (loss) (64) Balance at September 30, 2020 $ 12,499 Assets Measured at Fair Value on a Nonrecurring Basis The following tables set forth the Company’s financial assets subject to fair value adjustments on a nonrecurring basis at the date indicated that are valued at the lower of cost or market. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement: September 30, 2020 (In thousands) Quoted Prices in Significant Significant Total Total Losses Loans $ — $ — $ 14,325 $ 14,325 $ (11,326) Other real estate owned — — 1,671 1,671 (282) Total $ — $ — $ 15,996 $ 15,996 $ (11,608) December 31, 2019 (In thousands) Quoted Prices in Significant Significant Total Total Losses Loans $ — $ — $ 6,886 $ 6,886 $ (6,299) Other real estate owned — — 1,482 1,482 (281) Total $ — $ — $ 8,368 $ 8,368 $ (6,580) At September 30, 2020, loans totaling $56.1 million were written down to fair value of $47.8 million as a result of individual credit loss allowances of $8.3 million associated with the collateral dependent loans. Loans totaling $24.8 million were written down to fair value of $19.3 million at December 31, 2019 as a result of individual credit loss allowances of $5.5 million associated with the collateral dependent loans. Fair value of the collateral dependent loans is measured based on the loan’s observable market price or the fair value of the collateral (less estimated selling costs). Collateral may be real estate and/or business assets such as equipment, inventory and/or accounts receivable. The value of business equipment, inventory and accounts receivable collateral is based on net book value on the business’ financial statements and, if necessary, discounted based on management’s review and analysis. Appraised and reported values may be discounted based on management’s historical experience, changes in market conditions from the time of valuation, and/or management’s expertise and knowledge of the client and client’s business. Collateral dependent loans are reviewed and evaluated on at least a quarterly basis for additional individual reserve and adjusted accordingly, based on the factors identified above. OREO is adjusted to fair value upon acquisition of the real estate collateral. Subsequently, OREO is carried at the lower of carrying value or fair value. The estimated fair value for OREO included in Level 3 is determined by independent market based appraisals and other available market information, less costs to sell, that may be reduced further based on market expectations or an executed sales agreement. If the fair value of the collateral deteriorates subsequent to initial recognition, the Company records the OREO as a nonrecurring Level 3 adjustment. Valuation techniques are consistent with those techniques applied in prior periods. Fair Value of Financial Instruments The Company discloses fair value information, based on the exit price notion, of financial instruments that are not measured at fair value in the financial statements. Fair value is the amount at which a financial instrument could be exchanged in a current transaction between willing parties, other than in a forced sale or liquidation, and is best evidenced by a quoted market price, if one exists. Quoted market prices, where available, are shown as estimates of fair market values. Because no quoted market prices are available for a significant portion of the Company's financial instruments, the fair value of such instruments has been derived based on the amount and timing of future cash flows and estimated discount rates based on observable inputs (“Level 2”) or unobservable inputs (“Level 3”). Present value techniques used in estimating the fair value of many of the Company's financial instruments are significantly affected by the assumptions used. In that regard, the derived fair value estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate cash settlement of the instrument. Additionally, the accompanying estimates of fair values are only representative of the fair values of the individual financial assets and liabilities, and should not be considered an indication of the fair value of the Company. Management utilizes internal models used in asset liability management to determine the fair values disclosed below. The carrying amounts and fair values of the Company’s financial instruments at the dates indicated are presented in the following tables: Fair Value Measurements September 30, 2020 Quoted Prices in Significant Other Significant (In thousands) Carrying Estimated Financial assets: Cash and cash equivalents $ 224,883 $ 224,883 $ 224,883 $ — $ — Residential mortgage loans held for sale 88,728 88,728 — 88,728 — Investments available-for-sale 1,357,205 1,357,205 — 1,344,706 12,499 Equity securities 68,528 68,528 68,528 — — Loans, net of allowance 10,163,621 10,332,039 — — 10,332,039 Interest rate swap agreements 10,223 10,223 — 10,223 — Accrued interest receivable 48,176 48,176 48,176 — — Bank owned life insurance 126,182 126,182 — 126,182 — Financial liabilities: Time deposits $ 1,868,285 $ 1,889,807 $ — $ 1,889,807 $ — Other deposits 8,096,684 8,096,684 8,096,684 — — Securities sold under retail repurchase agreements and federal funds purchased 462,706 462,889 — 462,889 — Advances from FHLB 444,210 457,875 — 457,875 — Subordinated debt 230,300 234,808 — — 234,808 Interest rate swap agreements 10,223 10,223 — 10,223 — Accrued interest payable 6,822 6,822 6,822 — — Fair Value Measurements December 31, 2019 Quoted Prices in Significant Other Significant (In thousands) Carrying Estimated Financial assets: Cash and cash equivalents $ 146,103 $ 146,103 $ 146,103 $ — $ — Residential mortgage loans held for sale 53,701 53,701 — 53,701 — Investments available-for-sale 1,073,333 1,073,333 — 1,063,471 9,862 Equity securities 51,803 51,803 51,803 — — Loans, net of allowance 6,649,100 6,628,054 — — 6,628,054 Interest rate swap agreements 2,507 2,507 — 2,507 — Accrued interest receivable 23,282 23,282 23,282 — — Bank owned life insurance 113,171 113,171 — 113,171 — Financial liabilities: Time deposits $ 1,542,322 $ 1,547,116 $ — $ 1,547,116 $ — Other deposits 4,897,997 4,897,997 4,897,997 — — Securities sold under retail repurchase agreements and federal funds purchased 213,605 213,605 — 213,605 — Advances from FHLB 513,777 520,729 — 520,729 — Subordinated debt 209,406 200,864 — — 200,864 Interest rate swap agreements 2,507 2,507 — 2,507 — Accrued interest payable 4,194 4,194 4,194 — —

SEGMENT REPORTING

SEGMENT REPORTING	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
SEGMENT REPORTING	SEGMENT REPORTINGCurrently, the Company conducts business in three operating segments - Community Banking, Insurance and Investment Management. Each of the operating segments is a strategic business unit that offers different products and services. The Insurance and Investment Management segments were businesses that were acquired in separate transactions where management of the acquired business was retained. The accounting policies of the segments are the same as those of the Company. However, the segment data reflects inter-segment transactions and balances. The Community Banking segment is conducted through Sandy Spring Bank and involves delivering a broad range of financial products and services, including various loan and deposit products, to both individuals and businesses. Parent company income and assets are included in the Community Banking segment, as the majority of parent company functions is related to this segment. Beginning on April 1, 2020, the Community Banking segment includes the impact from the Revere acquisition. Major revenue sources include net interest income, gains on sales of mortgage loans, trust income fees and service charges on deposit accounts. Expenses include personnel, occupancy, marketing, equipment and other expenses. Non-cash charges associated with amortization of intangibles were $1.4 million and $0.4 million for the three months ended September 30, 2020 and 2019, respectively, and were $3.2 million and $1.3 million for the nine months ended September 30, 2020 and 2019, respectively. The Insurance segment is conducted through Sandy Spring Insurance, a subsidiary of the Bank. Sandy Spring Insurance operates Sandy Spring Insurance, a general insurance agency located in Annapolis, Maryland, and Neff and Associates, located in Ocean City, Maryland. Major sources of revenue are insurance commissions from commercial lines, personal lines, and medical liability lines. Expenses include personnel, occupancy, support charges and other expenses. Non-cash charges associated with amortization of intangibles were not significant for the three and nine months ended September 30, 2020 and 2019. The Investment Management segment is conducted through West Financial and RPJ, subsidiaries of the Bank. These asset management and financial planning firms, located in McLean, Virginia and Falls Church, Virginia, respectively, provide comprehensive investment management and financial planning to individuals, families, small businesses and associations, including cash flow analysis, investment review, tax planning, retirement planning, insurance analysis and estate planning. West Financial and RPJ had approximately $3.1 billion in combined assets under management as of September 30, 2020. Major revenue sources include non-interest income earned on the above services. Expenses include personnel, occupancy, support charges and other expenses. Non-cash charges associated with amortization of intangibles were $0.5 million and $1.4 million for the three and nine months ended September 30, 2020, and were not significant for the same periods in the prior year. Information for the operating segments and reconciliation of the information to the Condensed Consolidated Financial Statements for the periods indicated are presented in the following tables: Three Months Ended September 30, 2020 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 112,985 $ 1 $ 1 $ (3) $ 112,984 Interest expense 15,503 — — (3) 15,500 Provision for credit losses 7,003 — — — 7,003 Non-interest income 24,746 2,119 2,746 (221) 29,390 Non-interest expense 57,856 1,580 1,722 (221) 60,937 Income before income taxes 57,369 540 1,025 — 58,934 Income tax expense 13,912 149 231 — 14,292 Net income $ 43,457 $ 391 $ 794 $ — $ 44,642 Assets $ 12,678,396 $ 11,289 $ 57,088 $ (68,642) $ 12,678,131 Three Months Ended September 30, 2019 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 87,068 $ 13 $ 4 $ (3) $ 87,082 Interest expense 20,295 — — (3) 20,292 Provision for credit losses 1,524 — — — 1,524 Non-interest income 14,080 2,123 2,538 (168) 18,573 Non-interest expense 41,806 1,635 1,652 (168) 44,925 Income before income taxes 37,523 501 890 — 38,914 Income tax expense 9,162 138 231 — 9,531 Net income $ 28,361 $ 363 $ 659 $ — $ 29,383 Assets $ 8,437,588 $ 11,615 $ 22,033 $ (33,698) $ 8,437,538 Nine Months Ended September 30, 2020 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 311,771 $ 5 $ 3 $ (10) $ 311,769 Interest expense 48,447 — — (10) 48,437 Provision for credit losses 90,158 — — — 90,158 Non-interest income 57,976 5,446 7,705 (645) 70,482 Non-interest expense 184,921 4,319 5,526 (645) 194,121 Income before income taxes 46,221 1,132 2,182 — 49,535 Income tax expense 8,396 313 535 — 9,244 Net income $ 37,825 $ 819 $ 1,647 $ — $ 40,291 Assets $ 12,678,396 $ 11,289 $ 57,088 $ (68,642) $ 12,678,131 Nine Months Ended September 30, 2019 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 262,465 $ 15 $ 9 $ (10) $ 262,479 Interest expense 62,764 — — (10) 62,754 Provision for credit losses 3,029 — — — 3,029 Non-interest income 39,643 5,296 7,660 (501) 52,098 Non-interest expense 123,876 4,359 5,270 (501) 133,004 Income before income taxes 112,439 952 2,399 — 115,790 Income tax expense 26,924 265 625 — 27,814 Net income $ 85,515 $ 687 $ 1,774 $ — $ 87,976 Assets $ 8,437,588 $ 11,615 $ 22,033 $ (33,698) $ 8,437,538

SIGNIFICANT ACCOUNTING POLICI_2

SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations Sandy Spring Bancorp, Inc. ("Sandy Spring" or, together with its subsidiaries, the "Company"), a Maryland corporation, is the bank holding company for Sandy Spring Bank (the “Bank”). Independent and community-oriented, Sandy Spring Bank offers a broad range of commercial banking, retail banking, mortgage services and trust services throughout central Maryland, Northern Virginia, and the greater Washington, D.C. market. Sandy Spring Bank also offers a comprehensive menu of insurance and wealth management services through its subsidiaries, Sandy Spring Insurance Corporation (“Sandy Spring Insurance”), West Financial Services, Inc. (“West Financial”) and Rembert Pendleton Jackson (“RPJ”).
Basis of Presentation	Basis of Presentation The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America (“GAAP”), prevailing practices within the financial services industry for interim financial information and Rule 10-01 of Regulation S-X. Accordingly, the interim financial statements do not include all of the information and notes required for complete financial statements. The following summary of significant accounting policies of the Company is presented to assist the reader in understanding the financial and other data presented in this report. Operating results for the three and nine months ended September 30, 2020 are not necessarily indicative of the results that may be expected for any future periods or for the year ending December 31, 2020. In the opinion of management, all adjustments necessary for a fair presentation of the results of the interim periods have been included. Certain reclassifications have been made to prior period amounts, as necessary, to conform to the current period presentation. The Company has evaluated subsequent events through the date of the issuance of its financial statements. These statements should be read in conjunction with the financial statements and accompanying notes included in the Company’s 2019 Annual Report on Form 10-K as filed with the Securities and Exchange Commission (“SEC”) on February 21, 2020. With the exception of the adoption of ASC 326 – Financial Instruments – Credit Losses, commonly referred to as Current Expected Credit Losses ("CECL") standard, during the first quarter of 2020, there have been no other significant changes to any of the Company’s accounting policies as disclosed in the 2019 Annual Report on Form 10-K.
Principles of Consolidation	Principles of Consolidation The unaudited Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiary, Sandy Spring Bank, and its subsidiaries, Sandy Spring Insurance, West Financial and RPJ. Consolidation has resulted in the elimination of all intercompany accounts and transactions. See Note 18 for more information on the Company’s segments and consolidation.
Use of Estimates	Use of Estimates The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, in addition to affecting the reported amounts of revenues earned and expenses incurred during the reporting period. Actual results could differ from those estimates. Estimates that could change significantly relate to the provision for credit losses and the related allowance, potential impairment of goodwill or other intangible assets, valuation of investment securities and the determination of whether available-for-sale debt securities with fair values less than amortized costs are impaired and require an allowance for credit losses, valuation of other real estate owned, valuation of share based compensation, the assessment that a liability should be recognized with respect to any matters under litigation, the calculation of current and deferred income taxes, and the actuarial projections related to pension expense and the related liability.
Cash Flows	Cash Flows For purposes of reporting cash flows, cash and cash equivalents include cash and due from banks, federal funds sold and interest-bearing deposits with banks (items with stated original maturity of three months or less).
Revenue from Contracts with Customers	Revenue from Contracts with Customers The Company’s revenue includes net interest income on financial instruments and non-interest income. Specific categories of revenue are presented in the Condensed Consolidated Statements of Income. Most of the Company’s revenue is not within the scope of Accounting Standard Codification (“ASC”) 606 – Revenue from Contracts with Customers. For revenue within the scope of ASC 606, the Company provides services to customers and has related performance obligations. The revenue from such services is recognized upon satisfaction of all contractual performance obligations. The following discusses key revenue streams within the scope of revenue recognition guidance. Wealth Management Income West Financial and RPJ provide comprehensive investment management and financial planning services. Wealth management income is comprised of income for providing trust, estate and investment management services. Trust services include acting as a trustee for corporate or personal trusts. Investment management services include investment management, record-keeping and reporting of security portfolios. Fees for these services are recognized based on a contractually-agreed fixed percentage applied to net assets under management at the end of each reporting period. The Company does not charge/recognize any performance-based fees. Insurance Agency Commissions Sandy Spring Insurance, a subsidiary of the Bank, performs the function of an insurance intermediary by introducing the policyholder and insurer and is compensated by a commission fee for placement of an insurance policy. Sandy Spring Insurance does not provide any captive management services or any claim handling services. Commission fees are set as a percentage of the premium for the insurance policy for which Sandy Spring Insurance is a producer. Sandy Spring Insurance recognizes revenue when the insurance policy has been contractually agreed to by the insurer and policyholder (at transaction date). Service Charges on Deposit Accounts Service charges on deposit accounts are earned on depository accounts for consumer and commercial account holders and include fees for account and overdraft services. Account services include fees for event-driven services and periodic account maintenance activities. An obligation for event-driven services is satisfied at the time of the event when service is delivered and revenue recognized as earned. Obligation for maintenance activities is satisfied over the course of each month and revenue is recognized at month end. The overdraft services obligation is satisfied at the time of the overdraft and revenue is recognized as earned.
Loan Financing Receivables	Loan Financing Receivables The Company’s financing receivables consist primarily of loans that are stated at their principal balance outstanding, net of any unearned income, acquisition fair value marks and deferred loan origination fees and costs. Interest income on loans is accrued at the contractual rate based on the principal balance outstanding. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the related loan yield using the interest method. The Company has provided short term deferrals of loan principal and/or interest payments up to 180 days for customers who are affected by the COVID-19 pandemic. Customers receiving payment deferrals must meet certain criteria, such as being in good standing and not more than 30 days past due prior to the pandemic. In most cases, the deferred principal and/or interest amounts will be collected at the end of the life of the loan and will not accrue additional interest. The granting of a deferral of principal and/or interest under the Coronavirus Aid, Relief, and Economic Security (“CARES”) Act does not subject the loan to the past due, non-accrual, or troubled debt restructurings (“TDR”) policies described below. The following discussions of past due, non-accrual, and TDR policies remain valid for situations not covered by the CARES Act. Loans are considered past due or delinquent when the principal or interest due in accordance with the contractual terms of the loan agreement or any portion thereof remains unpaid after the due date of the scheduled payment. Immaterial shortfalls in payment amounts do not necessarily result in a loan being considered delinquent or past due. If any payments are past due and subsequent payments are resumed without payment of the delinquent amount, the loan shall continue to be considered past due. Whenever any loan is reported delinquent on a principal or interest payment or portion thereof, the amount reported as delinquent is the outstanding principal balance of the loan. Loans, except for consumer installment loans, are placed into non-accrual status when any portion of the loan principal or interest becomes 90 days past due. Management may determine that certain circumstances warrant earlier discontinuance of interest accruals on specific loans if an evaluation of other relevant factors (such as bankruptcy, interruption of cash flows, etc.) indicates collection of amounts contractually due is unlikely. These loans are considered, collectively, to be non-performing loans. Consumer installment loans that are not secured by real estate are not placed on non-accrual, but are charged down to their net realizable value when they are four months past due. Loans designated as non-accrual have all previously accrued but unpaid interest reversed. Interest income is not recognized on non-accrual loans. All payments received on non-accrual loans are applied using a cost-recovery method to reduce the outstanding principal balance until the loan returns to accrual status. Loans may be returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured. Loans considered to be TDRs are loans that have their terms restructured (e.g., interest rates, loan maturity date, payment and amortization period, etc.) in circumstances that provide payment relief to a borrower experiencing financial difficulty. All restructured collateral-dependent loans are individually assessed for allowance for credit losses and may either be in accruing or non-accruing status. Non-accruing restructured loans may return to accruing status provided doubt has been removed concerning the collectability of principal and interest as evidenced by a sufficient period of payment performance in accordance with the restructured terms. Loans may be removed from the restructured category if the borrower is no longer experiencing financial difficulty, a re-underwriting event took place, and the revised loan terms of the subsequent restructuring agreement are considered to be consistent with terms that can be obtained in the market for loans with comparable credit risk. In accordance with provisions of the CARES Act and interagency guidance issued by the federal banking agencies, the Company does not classify COVID-19 short term loan modifications as TDRs, nor are the customers considered delinquent with regard to their deferred payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it was determined upon entry into the program.
Allowance for Credit Losses	Allowance for Credit Losses The allowance for credit losses (“allowance” or “ACL”) represents an amount which, in management's judgment, is adequate to absorb the lifetime expected losses that may be sustained on outstanding loans at the balance sheet date based on the evaluation of the size and current risk characteristics of the loan portfolio, past events, current conditions, reasonable and supportable forecasts of future economic conditions and prepayment experience. The allowance is measured and recorded upon the initial recognition of a financial asset. The allowance is reduced by charge-offs, net of recoveries of previous losses, and is increased or decreased by a provision or credit for credit losses, which is recorded as a current period expense. Determination of the adequacy of the allowance is inherently complex and requires the use of significant and highly subjective estimates. The reasonableness of the allowance is reviewed periodically by the Risk Committee of the Board of Directors and formally approved quarterly by that same committee of the Board. The Company’s methodology for estimating the allowance includes: (1) a collective quantified reserve that reflects the Company’s historical default and loss experience adjusted for expected economic conditions throughout a reasonable and supportable period and the Company’s prepayment and curtailment rates; (2) collective qualitative factors that consider concentrations of the loan portfolio, expected changes to the economic forecasts, large relationships, early delinquencies, and factors related to credit administrations, including, among others, loan-to-value ratios, borrowers’ risk rating and credit score migrations; and (3) individual allowances on collateral-dependent loans where borrowers are experiencing financial difficulty or when the Company determines that the foreclosure is probable. The Company excludes accrued interest from the measurement of the allowance as the Company has a non-accrual policy to reverse any accrued, uncollected interest income as loans are moved to non-accrual status. Loans are pooled into segments based on the similar risk characteristics of the underlying borrowers, in addition to consideration of collateral type, industry and business purpose of the loans. Portfolio segments used to estimate the allowance are the same as portfolio segments used for general credit risk management purposes. Refer to Note 4 for more details on the Company’s portfolio segments. The Company applies two calculation methodologies to estimate the collective quantified component of the allowance: discounted cash flows method and weighted average remaining life method. Allowance estimates on commercial acquisition, development and construction (“AD&C”) and residential construction segments are based on the weighted average remaining life method. Allowance estimates on all other portfolio segments are based on the discounted cash flows method. Segments utilizing the discounted cash flows method are further sub-segmented into risk level pools, determined either by risk rating for commercial loans or Beacon Scores ranges for residential and consumer loans. To better manage risk and reasonably determine the sufficiency of reserves, this segregation allows the Company to monitor the allowance component applicable to higher risk loans separate from the remainder of the portfolio. Collective calculation methodologies utilize the Company’s historical default and loss experience adjusted for future economic forecasts. The reasonable and supportable forecast period represents a two-year economic outlook for the applicable economic variables. Following the end of the reasonable and supportable forecast period expected losses revert back to the historical mean over the next two years on a straight-line basis. Economic variables that have the most significant impact on the allowance include: unemployment rate, house price index and number of business bankruptcies. Contractual loan level cash flows within the discounted cash flows methodology are adjusted for the Company’s historical prepayment and curtailment rate experience. The individual reserve assessment is applied to collateral dependent loans where borrowers are experiencing financial difficulty or when the Company determines that a foreclosure is probable. The determination of the fair value of the collateral depends on whether a repayment of the loan is expected to be from the sale or the operation of the collateral. When a repayment is expected from the operation of the collateral, the Company uses the present value of expected cash flows from the operation of the collateral as the fair value. When the repayment of the loan is expected from the sale of the collateral the fair value of the collateral is based on an observable market price or the collateral’s appraised value, less estimated costs to sell. Third party appraisals used in the individual reserve assessment are conducted at least annually with underlying assumptions that are reviewed by management. Third party appraisals may be obtained on a more frequent basis if deemed necessary. Internal evaluations of collateral value are conducted quarterly to ensure any further deterioration of the collateral value is recognized on a timely basis. During the individual reserve assessment, management also considers the potential future changes in the value of the collateral over the remainder of the loan’s remaining life. The Company may receive updated appraisals which contradict the preliminary determination of fair value used to establish an individual allowance on a loan. In these instances the individual allowance is adjusted to reflect the Company’s evaluation of the updated appraised fair value. In the event a loss was previously confirmed and the loan was charged down to the estimated fair value based on a previous appraisal, the balance of partially charged-off loans are not subsequently increased, but could be further decreased depending on the direction of the change in fair value. Payments on fully or partially charged-off loans are accounted for under the cost-recovery method. Under this method, all payments received are applied on a cash basis to reduce the entire outstanding principal balance, then to recognize a recovery of all previously charged-off amounts before any interest income may be recognized. Based on the individual reserve assessment, if the Company determines that the fair value of the collateral is less than the amortized cost basis of the loan, an individual allowance will be established measured as the difference between the fair value of the collateral (less costs to sell) and the amortized cost basis of the loan. Once a loss has been confirmed, the loan is charged-down to its estimated fair value. Large groups of smaller non-accrual homogeneous loans are not individually evaluated for allowance and include residential permanent and construction mortgages and consumer installment loans. These portfolios are reserved for on a collective basis using historical loss rates of similar loans over the weighted average life of each pool. Management believes it uses relevant information available to make determinations about the allowance and that it has established the existing allowance in accordance with GAAP. However, the determination of the allowance requires significant judgment, and estimates of expected lifetime losses in the loan portfolio can vary significantly from the amounts actually observed. While management uses available information to recognize expected losses, future additions to the allowance may be necessary based on changes in the loans comprising the portfolio, changes in the current and forecasted economic conditions, changes to the interest rate environment which may directly impact prepayment and curtailment rate assumptions, and changes in the financial condition of borrowers. The adoption of the CECL standard did not result in a significant change to any other credit risk management and monitoring processes, including identification of past due or delinquent borrowers, non-accrual practices, assessment of troubled debt restructurings or charge-off policies.
Acquired Loans	Acquired Loans Loans acquired in connection with acquisitions are recorded at their acquisition-date fair value. The allowance for credit losses related to the acquired loan portfolio is not carried over. Acquired loans are classified into two categories based on the credit risk characteristics of the underlying borrowers as either purchased credit deteriorated (“PCD”) loans, or loans with no evidence of credit deterioration (“non-PCD”). PCD loans are defined as a loan or pool of loans that have experienced more-than-insignificant credit deterioration since the origination date. The Company uses a combination of individual and pooled review approaches to determine if acquired loans are PCD. At acquisition, the Company considers a number of factors to determine if an acquired loan or pool of loans has experienced more-than-insignificant credit deterioration. These factors include: • loans classified as non-accrual, • loans with risk rating of special mention or worse (using the Company's risk rating scale), • loans with multiple risk rating downgrades since origination, • loans with evidence of being 60 days or more past due, • loans previously modified in a troubled debt restructuring, • loans that received an interest only or payment deferral modification, and • loans in industries that show evidence of additional risk due to economic conditions. The initial allowance related to PCD loans that share similar risk characteristics is established using a pooled approach. The Company uses either a discounted cash flow or weighted average remaining life method to determine the required level of the allowance. PCD loans that were classified as non-accrual as of the acquisition date and are collateral dependent are assessed for allowance on an individual basis. For PCD loans, an initial allowance is established on the acquisition date and added to the fair value of the loan to arrive at acquisition date amortized cost. Accordingly, no provision for credit losses is recognized on PCD loans at the acquisition date. Subsequent to the acquisition date, the initial allowance on PCD loans will increase or decrease based on future evaluations, with changes recognized in the provision for credit losses. Non-PCD loans are pooled into segments together with originated loans that share similar risk characteristics and have an allowance established on the acquisition date, which is recognized in the current period provision for credit losses. Determining the fair value of the acquired loans involves estimating the principal and interest payment cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. Management considers a number of factors in evaluating the acquisition-date fair value including the remaining life, interest rate profile, market interest rate environment, payment schedules, risk ratings, probability of default and loss given default, and estimated prepayment rates. For PCD loans, the non-credit discount or premium is allocated to individual loans as determined by the difference between the loan’s unpaid principal balance and amortized cost basis. The non-credit premium or discount is recognized into interest income on a level yield basis over the remaining expected life of the loan. For non-PCD loans, the fair value discount or premium is allocated to individual loans and recognized into interest income on a level yield basis over the remaining expected life of the loan.
Leases	Leases The Company determines if an arrangement is a lease at inception. All of the Company’s leases are currently classified as operating leases and are included in other assets and other liabilities on the Company’s Condensed Consolidated Statements of Condition. Right-of-use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term, and lease liabilities represent the Company’s obligation to make lease payments arising from the lease arrangements. Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of the expected future lease payments over the remaining lease term. In determining the present value of future lease payments, the Company uses its incremental borrowing rate based on the information available at the lease commencement date. The operating ROU assets are adjusted for any lease payments made at or before the lease commencement date, initial direct costs, any lease incentives received and, for acquired leases, any favorable or unfavorable fair value adjustments. The present value of the lease liability may include the impact of options to extend or terminate the lease when it is reasonably certain that the Company will exercise such options provided in the lease terms. Lease expense is recognized on a straight-line basis over the expected lease term. Lease agreements that include lease and non-lease components, such as common area maintenance charges, are accounted for separately.
Pending Accounting Pronouncements	Pending Accounting Pronouncements In March 2020, FASB released Accounting Standards Update (“ASU”) 2020-04 - Reference Rate Reform (Topic 848) , which provides optional guidance to ease the accounting burden in accounting for, or recognizing the effects from, reference rate reform on financial reporting. The new standard is a result of LIBOR likely being discontinued as an available benchmark rate. The standard is elective and provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, or other transactions that reference LIBOR, or another reference rate expected to be discontinued. The amendments in the update are effective for all entities between March 12, 2020 and December 31, 2022. The Company has established a cross-functional working group to guide the Company’s transition from LIBOR and has begun efforts to transition to alternative rates consistent with industry timelines. The Company has identified its products that utilize LIBOR and has implemented enhanced fallback language to facilitate the transition to alternative reference rates. The Company is evaluating existing platforms and systems and preparing to offer new rates. In December 2019, FASB released ASU 2019-12 - Income Taxes (Topic 740), which simplifies the accounting for income taxes by removing multiple exceptions to the general principals in Topic 740. The standard is effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2020. The Company does not expect the adoption of this standard to have a material impact on the Company’s Condensed Consolidated Financial Statements.

ACQUISITION OF REVERE BANK (Tab

ACQUISITION OF REVERE BANK (Tables)	9 Months Ended
	Sep. 30, 2020
Business Combinations [Abstract]
Provisional fair values of acquired identifiable assets and liabilities assumed	The consideration paid for Revere’s common equity and outstanding stock options and the provisional fair values of acquired identifiable assets and assumed identifiable liabilities as of the Acquisition Date were as follows: (Dollars in thousands, except per share data) April 1, 2020 Purchase price: Fair value of common shares issued (12,768,949 shares) based on Sandy Spring's share price of $22.64 $ 289,089 Fair value of Revere stock options converted to Sandy Spring stock options 3,611 Cash paid for cashed-out Revere stock options 291 Cash for fractional shares 11 Total purchase price $ 293,002 Identifiable assets: Cash and cash equivalents $ 80,768 Investments available-for-sale 180,752 Loans 2,502,244 Premises and equipment 3,443 Accrued interest receivable 7,651 Core deposit intangible asset 18,360 Other assets 52,812 Total identifiable assets $ 2,846,030 Identifiable liabilities: Deposits $ 2,322,422 Borrowings 205,514 Other liabilities 25,933 Total identifiable liabilities $ 2,553,869 Provisional fair value of net assets acquired including identifiable intangible assets 292,161 Provisional resulting goodwill $ 841

INVESTMENTS (Tables)

INVESTMENTS (Tables)	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Amortized cost and Estimated fair values of Investments Available-for-sale	The amortized cost and estimated fair values of investments available-for-sale at the dates indicated are presented in the following table: September 30, 2020 December 31, 2019 (In thousands) Amortized Gross Gross Estimated Amortized Gross Gross Estimated U.S. treasuries and government agencies $ 140,454 $ 914 $ (1,963) $ 139,405 $ 260,294 $ 887 $ (2,686) $ 258,495 State and municipal 344,168 9,435 (616) 352,987 229,309 4,377 (37) 233,649 Mortgage-backed and asset-backed 826,450 25,967 (103) 852,314 568,373 3,268 (882) 570,759 Corporate debt 12,112 394 (7) 12,499 9,100 452 — 9,552 Trust preferred — — — — 310 — — 310 Total debt securities 1,323,184 36,710 (2,689) 1,357,205 1,067,386 8,984 (3,605) 1,072,765 Marketable equity securities — — — — 568 — — 568 Total investments available-for-sale $ 1,323,184 $ 36,710 $ (2,689) $ 1,357,205 $ 1,067,954 $ 8,984 $ (3,605) $ 1,073,333
Gross Unrealized Losses and Fair Value by Length of Time	Gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in an unrealized loss position at the dates indicated are presented in the following tables: September 30, 2020 Number Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. treasuries and government agencies 7 $ — $ — $ 91,193 $ 1,963 $ 91,193 $ 1,963 State and municipal 19 57,024 616 — — 57,024 616 Mortgage-backed and asset-backed 13 28,862 77 7,030 26 35,892 103 Corporate debt 2 3,005 7 — — 3,005 7 Total 41 $ 88,891 $ 700 $ 98,223 $ 1,989 $ 187,114 $ 2,689 December 31, 2019 Number Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. treasuries and government agencies 12 $ 133,221 $ 2,211 $ 17,911 $ 475 $ 151,132 $ 2,686 State and municipal 3 7,227 37 — — 7,227 37 Mortgage-backed and asset-backed 35 107,917 508 76,867 374 184,784 882 Total 50 $ 248,365 $ 2,756 $ 94,778 $ 849 $ 343,143 $ 3,605
Estimated fair values of debt securities available-for-sale by contractual maturity	September 30, 2020 December 31, 2019 (In thousands) Fair Value Amortized Cost Fair Value Amortized Cost U.S. treasuries and government agencies: One year or less $ 28,139 $ 27,974 $ 69,799 $ 69,330 One to five years 11,902 11,380 96,709 96,507 Five to ten years — — — — After ten years 99,364 101,100 91,987 94,457 State and municipal: One year or less 18,663 18,457 33,311 33,054 One to five years 47,558 46,440 76,723 75,432 Five to ten years 59,670 56,731 75,820 73,741 After ten years 227,096 222,540 47,795 47,082 Mortgage-backed and asset-backed: One year or less 2 2 852 822 One to five years 21,191 20,800 7,125 6,969 Five to ten years 58,878 57,430 55,226 54,799 After ten years 772,243 748,218 507,556 505,783 Corporate debt: One year or less — — — — One to five years — — — — Five to ten years 12,499 12,112 9,552 9,100 After ten years — — — — Trust preferred: One year or less — — — — One to five years — — — — Five to ten years — — — — After ten years — — 310 310 Total available-for-sale debt securities $ 1,357,205 $ 1,323,184 $ 1,072,765 $ 1,067,386
Other Equity Securities	Other equity securities at the dates indicated are presented in the following table: (In thousands) September 30, 2020 December 31, 2019 Federal Reserve Bank stock $ 38,650 $ 22,559 Federal Home Loan Bank of Atlanta stock 29,201 29,244 Marketable equity securities 677 — Total equity securities $ 68,528 $ 51,803

LOANS (Tables)

LOANS (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Loan Portfolio Segment Balances	The loan portfolio segment balances at the dates indicated are presented in the following table: (In thousands) September 30, 2020 December 31, 2019 Commercial real estate: Commercial investor real estate $ 3,588,702 $ 2,169,156 Commercial owner-occupied real estate 1,652,208 1,288,677 Commercial AD&C 994,800 684,010 Commercial business 2,227,246 801,019 Total commercial loans 8,462,956 4,942,862 Residential real estate: Residential mortgage 1,173,857 1,149,327 Residential construction 175,123 146,279 Consumer 521,999 466,764 Total residential and consumer loans 1,870,979 1,762,370 Total loans $ 10,333,935 $ 6,705,232

CREDIT QUALITY ASSESSMENT (Tabl

CREDIT QUALITY ASSESSMENT (Tables)	9 Months Ended
	Sep. 30, 2020
Credit Loss [Abstract]
Summary Information On The Allowance For Credit Loss Activity	Summary information on the allowance for credit loss activity for the period indicated is provided in the following table: Nine Months Ended September 30, (In thousands) 2020 2019 Balance at beginning of period $ 56,132 $ 53,486 Initial allowance on PCD loans at adoption of ASC 326 2,762 — Transition impact of adopting ASC 326 2,983 — Initial allowance on acquired Revere PCD loans 18,628 — Provision for credit losses 90,158 3,029 Loan charge-offs (1,255) (2,101) Loan recoveries 906 578 Net charge-offs (349) (1,523) Balance at period end $ 170,314 $ 54,992
Summary Information Regarding Collateral Dependent Loans Individually Evaluated For Credit Loss	The following table provides summary information regarding collateral dependent loans individually evaluated for credit loss at the dates indicated: (In thousands) September 30, 2020 December 31, 2019 Collateral dependent loans individually evaluated for credit loss with an allowance $ 25,823 $ 15,333 Collateral dependent loans individually evaluated for credit loss without an allowance 30,299 9,440 Total individually evaluated collateral dependent loans $ 56,122 $ 24,773 Allowance for credit losses related to loans evaluated individually $ 8,263 $ 5,501 Allowance for credit losses related to loans evaluated collectively 162,051 50,631 Total allowance for credit losses $ 170,314 $ 56,132
Activity in Allowance for Credit Losses or Loan and Lease Losses by Respective Loan Portfolio Segment	The following table provides information on the activity in the allowance for credit losses by the respective loan portfolio segment for the period indicated: For the Nine Months Ended September 30, 2020 Commercial Real Estate Residential Real Estate (Dollars in thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Balance at beginning of period $ 18,407 $ 6,884 $ 7,590 $ 11,395 $ 8,803 $ 967 $ 2,086 $ 56,132 Initial allowance on PCD loans at adoption of ASC 326 1,114 — — 1,549 — — 99 2,762 Transition impact of adopting ASC 326 (3,125) 387 2,576 2,988 (388) (275) 820 2,983 Initial allowance on acquired Revere PCD loans 7,973 2,782 1,248 6,289 243 6 87 18,628 Provision for credit losses 30,884 9,600 7,377 34,671 3,595 761 3,270 90,158 Charge-offs (23) — — (429) (420) — (383) (1,255) Recoveries 6 — — 696 78 5 121 906 Net recoveries (charge-offs) (17) — — 267 (342) 5 (262) (349) Balance at end of period $ 55,236 $ 19,653 $ 18,791 $ 57,159 $ 11,911 $ 1,464 $ 6,100 $ 170,314 Total loans $ 3,588,702 $ 1,652,208 $ 994,800 $ 2,227,246 $ 1,173,857 $ 175,123 $ 521,999 $ 10,333,935 Allowance for credit losses to total loans ratio 1.54 % 1.19 % 1.89 % 2.57 % 1.01 % 0.84 % 1.17 % 1.65 % Balance of loans individually evaluated for credit loss $ 27,508 $ 6,511 $ 1,678 $ 18,728 $ 1,333 $ — $ 364 $ 56,122 Allowance related to loans evaluated individually $ 2,537 $ 22 $ 603 $ 5,101 $ — $ — $ — $ 8,263 Individual allowance to loans evaluated individually ratio 9.22 % 0.34 % 35.94 % 27.24 % — % — — 14.72 % Balance of loans collectively evaluated for credit loss $ 3,561,194 $ 1,645,697 $ 993,122 $ 2,208,518 $ 1,172,524 $ 175,123 $ 521,635 $ 10,277,813 Allowance related to loans evaluated collectively $ 52,699 $ 19,631 $ 18,188 $ 52,058 $ 11,911 $ 1,464 $ 6,100 $ 162,051 Collective allowance to loans evaluated collectively ratio 1.48 % 1.19 % 1.83 % 2.36 % 1.02 % 0.84 % 1.17 % 1.58 % The following table provides information on the activity in the allowance for loan losses by the respective loan portfolio segment for the period indicated: For the Year Ended December 31, 2019 Commercial Real Estate Residential Real Estate (Dollars in thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Balance at beginning of period $ 17,603 $ 6,307 $ 5,944 $ 11,377 $ 8,881 $ 1,261 $ 2,113 $ 53,486 Provision (credit) 788 577 1,418 1,164 474 (302) 565 4,684 Charge-offs — — — (1,195) (690) — (783) (2,668) Recoveries 16 — 228 49 138 8 191 630 Net recoveries (charge-offs) 16 — 228 (1,146) (552) 8 (592) (2,038) Balance at end of period $ 18,407 $ 6,884 $ 7,590 $ 11,395 $ 8,803 $ 967 $ 2,086 $ 56,132 Total loans $ 2,169,156 $ 1,288,677 $ 684,010 $ 801,019 $ 1,149,327 $ 146,279 $ 466,764 $ 6,705,232 Allowance for loan losses to total loans ratio 0.85 % 0.53 % 1.11 % 1.42 % 0.77 % 0.66 % 0.45 % 0.84 % Balance of loans specifically evaluated for impairment $ 9,212 $ 4,148 $ 829 $ 8,867 $ 1,717 $ — $ — $ 24,773 Allowance for loans specifically evaluated for impairment $ 1,529 $ 23 $ 132 $ 3,817 $ — $ — $ — $ 5,501 Specific allowance to specific loans ratio 16.60 % 0.55 % 15.92 % 43.05 % — — — 22.21 % Balance of loans collectively evaluated $ 2,150,400 $ 1,284,529 $ 683,181 $ 789,613 $ 1,147,602 $ 146,279 $ 465,771 $ 6,667,375 Allowance for loans collectively evaluated $ 16,878 $ 6,861 $ 7,458 $ 7,578 $ 8,803 $ 967 $ 2,086 $ 50,631 Collective allowance to collective loans ratio 0.78 % 0.53 % 1.09 % 0.96 % 0.77 % 0.66 % 0.45 % 0.76 % Balance of loans acquired with deteriorated credit quality $ 9,544 $ — $ — $ 2,539 $ 8 $ — $ 993 $ 13,084 Allowance for loans acquired with deteriorated credit quality $ — $ — $ — $ — $ — $ — $ — $ — Allowance to loan acquired with deteriorated credit quality ratio — — — — — — — —
Schedule Of Collateral Dependent Loans Individually Evaluated For Credit Loss With The Associated Allowances	The following table presents collateral dependent loans individually evaluated for credit loss with the associated allowances for credit losses by the applicable portfolio segment: September 30, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Loans individually evaluated for credit loss with an allowance: Non-accruing $ 14,267 $ — $ 1,678 $ 6,112 $ — $ — $ — $ 22,057 Restructured accruing — — — 938 — — — 938 Restructured non-accruing 724 853 — 1,251 — — — 2,828 Balance $ 14,991 $ 853 $ 1,678 $ 8,301 $ — $ — $ — $ 25,823 Allowance $ 2,537 $ 22 $ 603 $ 5,101 $ — $ — $ — $ 8,263 Loans individually evaluated for credit loss without an allowance: Non-accruing $ 11,417 $ 4,194 $ — $ 10,007 $ — $ — $ — $ 25,618 Restructured accruing 724 — — 131 1,061 — — 1,916 Restructured non-accruing 376 1,464 — 289 272 — 364 2,765 Balance $ 12,517 $ 5,658 $ — $ 10,427 $ 1,333 $ — $ 364 $ 30,299 Total individually evaluated loans: Non-accruing $ 25,684 $ 4,194 $ 1,678 $ 16,119 $ — $ — $ — $ 47,675 Restructured accruing 724 — — 1,069 1,061 — — 2,854 Restructured non-accruing 1,100 2,317 — 1,540 272 — 364 5,593 Balance $ 27,508 $ 6,511 $ 1,678 $ 18,728 $ 1,333 $ — $ 364 $ 56,122 Total unpaid contractual principal balance $ 33,452 $ 10,203 $ 1,678 $ 27,171 $ 2,683 $ — $ 364 $ 75,551
Table Of Average Principal Balance Of The Total Non-Accrual Loans, Contractual Interest Due And Interest Income	The following table presents average principal balance of total non-accrual loans, contractual interest due and interest income recognized on a cash basis on non-accrual loans for the periods indicated below: September 30, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Average non-accrual loans for the period $ 22,254 $ 5,366 $ 1,573 $ 14,932 $ 11,990 $ — $ 6,497 $ 62,612 Contractual interest income due on non- accrual loans during the period $ 1,496 $ 368 $ 67 $ 750 $ 447 $ — $ 292 $ 3,420
Summary Of Investment With Respect To Impaired Loans	The following tables present the recorded investment with respect to impaired loans, the associated allowance by the applicable portfolio segment and the unpaid contractual principal balance of the impaired loans: December 31, 2019 Commercial Real Estate Total Recorded (In thousands) Commercial Commercial Commercial Commercial All Impaired loans with a specific allowance: Non-accruing $ 5,448 $ 767 $ 829 $ 5,608 $ — $ 12,652 Restructured accruing — — — 266 — 266 Restructured non-accruing 437 122 — 1,856 — 2,415 Balance $ 5,885 $ 889 $ 829 $ 7,730 $ — $ 15,333 Allowance $ 1,529 $ 23 $ 132 $ 3,817 $ — $ 5,501 Impaired loans without a specific allowance: Non-accruing $ 2,552 $ 1,522 $ — $ 114 $ — $ 4,188 Restructured accruing 775 — — 151 1,444 2,370 Restructured non-accruing — 1,737 — 872 273 2,882 Balance $ 3,327 $ 3,259 $ — $ 1,137 $ 1,717 $ 9,440 Total impaired loans: Non-accruing $ 8,000 $ 2,289 $ 829 $ 5,722 $ — $ 16,840 Restructured accruing 775 — — 417 1,444 2,636 Restructured non-accruing 437 1,859 — 2,728 273 5,297 Balance $ 9,212 $ 4,148 $ 829 $ 8,867 $ 1,717 $ 24,773 Unpaid principal balance in total impaired loans $ 13,805 $ 6,072 $ 829 $ 11,296 $ 2,618 $ 34,620 December 31, 2019 Commercial Real Estate Total Recorded (In thousands) Commercial Commercial Commercial Commercial All Average impaired loans for the period $ 7,565 $ 4,390 $ 2,052 $ 7,781 $ 1,577 $ 23,365 Contractual interest income due on impaired loans during the period $ 786 $ 258 $ 127 $ 648 $ 128 $ 1,947 Interest income on impaired loans recognized on an accrual basis $ 39 $ — $ — $ 62 $ 68 $ 169
Schedule Of Information On The Credit Quality Of Loan Portfolio Under The New CECL	The following section provides information on the credit quality of the loan portfolio under the new CECL disclosure requirements: For the Nine Months Ended September 30, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Analysis of non-accrual loan activity: Balance at beginning of period $ 8,437 $ 4,148 $ 829 $ 8,450 $ 12,661 $ — $ 4,107 $ 38,632 PCD loans designated as non-accrual (1) 9,544 — — 2,539 8 — 993 13,084 Loans placed on non-accrual 9,437 3,425 2,128 10,988 896 — 3,677 30,551 Non-accrual balances transferred to OREO — — — — — — — — Non-accrual balances charged-off (23) — — (386) (351) — (121) (881) Net payments or draws (611) (961) (1,279) (3,052) (1,058) — (1,028) (7,989) Non-accrual loans brought current — (101) — (880) (860) — (135) (1,976) Balance at end of period $ 26,784 $ 6,511 $ 1,678 $ 17,659 $ 11,296 $ — $ 7,493 $ 71,421 (1) Upon the adoption of the CECL standard, the Company transitioned from closed pool level accounting for PCI loans during the first quarter of 2020. Non-accrual loans are determined based on the individual loan level and aggregated for reporting.
Credit Quality of Loan Portfolio by Segment	September 30, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Performing loans: Current $ 3,555,815 $ 1,643,589 $ 991,086 $ 2,198,943 $ 1,155,016 $ 169,766 $ 507,336 $ 10,221,551 30-59 days 4,181 2,108 1,634 8,862 5,197 3,167 5,039 30,188 60-89 days 1,198 — 402 620 967 2,190 2,130 7,507 Total performing loans 3,561,194 1,645,697 993,122 2,208,425 1,161,180 175,123 514,505 10,259,246 Non-performing loans: Non-accrual loans 26,784 6,511 1,678 17,659 11,296 — 7,493 71,421 Loans greater than 90 days past due — — — 93 320 — 1 414 Restructured loans 724 — — 1,069 1,061 — — 2,854 Total non-performing loans 27,508 6,511 1,678 18,821 12,677 — 7,494 74,689 Total loans $ 3,588,702 $ 1,652,208 $ 994,800 $ 2,227,246 $ 1,173,857 $ 175,123 $ 521,999 $ 10,333,935 December 31, 2019 Commercial Real Estate (In thousands) Commercial Commercial Commercial Commercial Total Pass $ 2,146,971 $ 1,278,337 $ 683,181 $ 783,909 $ 4,892,398 Special Mention 3,189 2,284 — 2,487 7,960 Substandard 18,996 8,056 829 14,623 42,504 Doubtful — — — — — Total $ 2,169,156 $ 1,288,677 $ 684,010 $ 801,019 $ 4,942,862 December 31, 2019 Residential Real Estate (In thousands) Residential Residential Consumer Total Performing $ 1,135,586 $ 146,279 $ 462,293 $ 1,744,158 Non-performing: — 90 days past due — — — — Non-accruing 12,661 — 4,107 16,768 Restructured loans 1,080 — 364 1,444 Total $ 1,149,327 $ 146,279 $ 466,764 $ 1,762,370
Information About Credit Quality Indicator By The Year Of Origination	The following table provides information about credit quality indicators by the year of origination: September 30, 2020 Term Loans by Origination Year Revolving (In thousands) 2020 2019 2018 2017 2016 Prior Loans Total Commercial Investor R/E: Pass $ 675,314 $ 799,088 $ 466,850 $ 501,591 $ 493,003 $ 566,433 $ 31,413 $ 3,533,692 Special Mention 5,049 1,617 19,026 232 271 1,873 — 28,068 Substandard 494 3,020 — 7,101 682 15,645 — 26,942 Doubtful — — — — — — — — Total $ 680,857 $ 803,725 $ 485,876 $ 508,924 $ 493,956 $ 583,951 $ 31,413 $ 3,588,702 Commercial Owner-Occupied R/E: Pass $ 207,879 $ 392,597 $ 248,942 $ 203,649 $ 209,218 $ 356,393 $ 1,812 $ 1,620,490 Special Mention 2,324 4,124 5,505 5,381 137 5,307 — 22,778 Substandard 493 870 788 465 222 5,863 — 8,701 Doubtful — — — — — 239 — 239 Total $ 210,696 $ 397,591 $ 255,235 $ 209,495 $ 209,577 $ 367,802 $ 1,812 $ 1,652,208 Commercial AD&C: Pass $ 356,246 $ 292,303 $ 169,833 $ 62,582 $ 6,711 $ 2,377 $ 83,756 $ 973,808 Special Mention 1,710 — — 13,658 — — — 15,368 Substandard 1,127 1,554 — 100 2,843 — — 5,624 Doubtful — — — — — — — — Total $ 359,083 $ 293,857 $ 169,833 $ 76,340 $ 9,554 $ 2,377 $ 83,756 $ 994,800 Commercial Business: Pass $ 1,190,428 $ 215,772 $ 149,231 $ 97,275 $ 37,641 $ 88,653 $ 410,116 $ 2,189,116 Special Mention 249 3,517 1,462 18 1,467 2,210 4,365 13,288 Substandard 2,050 3,242 3,287 1,713 2,353 2,070 1,708 16,423 Doubtful 114 1,042 950 36 1,309 1,987 2,981 8,419 Total $ 1,192,841 $ 223,573 $ 154,930 $ 99,042 $ 42,770 $ 94,920 $ 419,170 $ 2,227,246 Residential Mortgage: Beacon score: 660-850 $ 169,476 $ 69,350 $ 164,196 $ 207,953 $ 153,302 $ 285,639 $ — $ 1,049,916 600-659 4,235 11,924 12,136 13,559 9,753 24,752 — 76,359 540-599 321 1,833 5,089 2,722 3,507 9,270 — 22,742 less than 540 391 1,739 6,049 1,367 2,769 12,525 — 24,840 Total $ 174,423 $ 84,846 $ 187,470 $ 225,601 $ 169,331 $ 332,186 $ — $ 1,173,857 Residential Construction: Beacon score: 660-850 $ 79,897 $ 66,861 $ 19,900 $ 3,963 $ 1,736 $ — $ — $ 172,357 600-659 987 904 — — 369 — — 2,260 540-599 — — — — — — — — less than 540 506 — — — — — — 506 Total $ 81,390 $ 67,765 $ 19,900 $ 3,963 $ 2,105 $ — $ — $ 175,123 Consumer: Beacon score: 660-850 $ 2,561 $ 5,345 $ 5,327 $ 2,297 $ 2,772 $ 23,023 $ 420,848 $ 462,173 600-659 608 747 286 452 1,076 5,090 20,555 28,814 540-599 49 433 260 93 503 3,101 8,141 12,580 less than 540 742 521 608 1,053 761 3,113 11,634 18,432 Total $ 3,960 $ 7,046 $ 6,481 $ 3,895 $ 5,112 $ 34,327 $ 461,178 $ 521,999 Total loans $ 2,703,250 $ 1,878,403 $ 1,279,725 $ 1,127,260 $ 932,405 $ 1,415,563 $ 997,329 $ 10,333,935
Historical Information On The Credit Quality Of The Loan Portfolio Under The Legacy Disclosure	The following section provides historical information on the credit quality of the loan portfolio under the legacy disclosure requirements: December 31, 2019 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Non-performing loans and assets: Non-accrual loans $ 8,437 $ 4,148 $ 829 $ 8,450 $ 12,661 $ — $ 4,107 $ 38,632 Loans 90 days past due — — — — — — — — Restructured loans 775 — — 417 1,080 — 364 2,636 Total non-performing loans 9,212 4,148 829 8,867 13,741 — 4,471 41,268 Other real estate owned 409 — 665 39 305 — 64 1,482 Total non-performing assets $ 9,621 $ 4,148 $ 1,494 $ 8,906 $ 14,046 $ — $ 4,535 $ 42,750 December 31, 2019 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Past due loans: 30-59 days $ 932 $ 316 $ — $ 908 $ 14,853 $ 280 $ 2,697 $ 19,986 60-89 days — — — 370 4,541 1,334 1,517 7,762 > 90 days — — — — — — — — Total past due 932 316 — 1,278 19,394 1,614 4,214 27,748 Non-accrual loans 8,437 4,148 829 8,450 12,661 — 4,107 38,632 Loans acquired with deteriorated credit quality 9,544 — — 2,539 8 — 993 13,084 Current loans 2,150,243 1,284,213 683,181 788,752 1,117,264 144,665 457,450 6,625,768 Total loans $ 2,169,156 $ 1,288,677 $ 684,010 $ 801,019 $ 1,149,327 $ 146,279 $ 466,764 $ 6,705,232
Restructured Loans for Specific Segments of Loan Portfolio	The following table provides the amounts of the restructured loans at the date of restructuring for specific segments of the loan portfolio during the period indicated: For the Nine Months Ended September 30, 2020 Commercial Real Estate (In thousands) Commercial Commercial Commercial Commercial All Total Troubled debt restructurings: Restructured accruing $ — $ — $ — $ 322 $ — $ 322 Restructured non-accruing 723 930 — 808 — 2,461 Balance $ 723 $ 930 $ — $ 1,130 $ — $ 2,783 Specific allowance $ 49 $ 19 $ — $ 867 $ — $ 935 Restructured and subsequently defaulted $ — $ — $ — $ — $ — $ — For the Year Ended December 31, 2019 Commercial Real Estate (In thousands) Commercial Commercial Commercial Commercial All Total Troubled debt restructurings: Restructured accruing $ 775 $ — $ — $ 170 $ 364 $ 1,309 Restructured non-accruing 789 — — 261 — 1,050 Balance $ 1,564 $ — $ — $ 431 $ 364 $ 2,359 Specific allowance $ 205 $ — $ — $ 196 $ — $ 401 Restructured and subsequently defaulted $ — $ — $ — $ — $ — $ —

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Gross Carrying Amounts and Accumulated Amortization of Intangible Assets and Goodwill	The gross carrying amounts and accumulated amortization of intangible assets and goodwill are presented at the dates indicated in the following table: September 30, 2020 Weighted December 31, 2019 Weighted (Dollars in thousands) Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets: Core deposit intangibles $ 29,038 $ (6,841) $ 22,197 8.7 years $ 10,678 $ (3,689) $ 6,989 8.0 years Other identifiable intangibles 13,906 (1,928) 11,978 10.9 years 1,478 (626) 852 9.7 years Total amortizing intangible assets $ 42,944 $ (8,769) $ 34,175 $ 12,156 $ (4,315) $ 7,841 Goodwill $ 370,549 $ 370,549 $ 347,149 $ 347,149
Net carrying amount of goodwill by segment	The amount of goodwill by reportable segment is presented in the following table: (In thousands) Community Insurance Investment Total Balance December 31, 2019 $ 331,173 $ 6,788 $ 9,188 $ 347,149 Acquisition of Rembert Pendleton Jackson — — 22,559 22,559 Acquisition of Revere Bank 841 — — 841 Balance September 30, 2020 $ 332,014 $ 6,788 $ 31,747 $ 370,549
Estimated Future Amortization Expense for Amortizing Intangibles	The following table presents the estimated future amortization expense for amortizing intangible assets within the years ending December 31: (In thousands) Amount Remaining for 2020 $ 1,654 2021 6,600 2022 5,845 2023 5,089 2024 4,333 Thereafter 10,654 Total amortizing intangible assets $ 34,175

DEPOSITS (Tables)

DEPOSITS (Tables)	9 Months Ended
	Sep. 30, 2020
Deposits [Abstract]
Composition of Deposits	(In thousands) September 30, 2020 December 31, 2019 Noninterest-bearing deposits $ 3,458,804 $ 1,892,052 Interest-bearing deposits: Demand 1,137,000 836,433 Money market savings 3,104,600 1,839,593 Regular savings 396,280 329,919 Time deposits of less than $100,000 545,903 463,431 Time deposits of $100,000 or more 1,322,382 1,078,891 Total interest-bearing deposits 6,506,165 4,548,267 Total deposits $ 9,964,969 $ 6,440,319

BORROWINGS (Tables)

BORROWINGS (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Schedule of Subordinated Borrowing	The following table provides information on subordinated debt as of the date indicated: (In thousands) September 30, 2020 December 31, 2019 Fixed to floating rate sub debt, 4.25% $ 175,000 $ 175,000 WashingtonFirst sub debt, 6.00% 25,000 25,000 Revere fixed to floating rate sub debt, 5.625% 31,000 — Total Sub debt 231,000 200,000 Add: Purchase accounting premium 1,954 1,894 Less: Debt issuance costs (2,654) (2,885) Net sub debt 230,300 199,009 WashingtonFirst callable junior subordinated debt — 10,310 Add: Purchase accounting premium — 87 Net WashingtonFirst callable junior subordinated debt — 10,397 Long-term borrowings $ 230,300 $ 209,406

SHARE BASED COMPENSATION (Table

SHARE BASED COMPENSATION (Tables)	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Summary of Share Option Activity	A summary of share option activity for the period indicated is reflected in the following table: Number Weighted Weighted Aggregate Balance at Balance at January 1, 2020 65,279 $ 31.34 $ 485 Granted — $ — Converted options from Revere acquisition 395,298 $ 12.27 Exercised (10,213) $ 16.07 $ 123 Forfeited (765) $ 39.02 Expired (703) $ 28.26 Balance at September 30, 2020 448,896 $ 14.89 3.1 $ 4,383 Exercisable at September 30, 2020 444,132 $ 14.64 3.1 $ 4,383
Summary of Activity for Company's Restricted Stock	A summary of the activity for the Company’s restricted stock, restricted stock units and performance share units for the period indicated is presented in the following table: Number Weighted Non-vested at Non-vested at January 1, 2020 226,502 $ 35.43 Granted 246,015 $ 25.82 Vested (66,533) $ 34.38 Forfeited/ cancelled (9,363) $ 43.71 Non-vested at September 30, 2020 396,621 $ 29.45

PENSION PLAN (Tables)

PENSION PLAN (Tables)	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Net Periodic Benefit Cost	The components of net periodic benefit cost for the periods indicated are presented in the following table: Three Months Ended September 30, Nine Months Ended September 30, (In thousands) 2020 2019 2020 2019 Interest cost on projected benefit obligation $ 359 $ 403 $ 1,078 $ 1,207 Expected return on plan assets (456) (412) (1,368) (1,236) Recognized net actuarial loss 219 264 656 794 Net periodic benefit cost $ 122 $ 255 $ 366 $ 765

NET INCOME_ (LOSS) PER COMMON S

NET INCOME/ (LOSS) PER COMMON SHARE (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Calculation of Net Income Per Common Share	The calculation of net income per common share for the periods indicated is presented in the following table: Three Months Ended September 30, Nine Months Ended September 30, (Dollars and amounts in thousands, except per share data) 2020 2019 2020 2019 Net income $ 44,642 $ 29,383 $ 40,291 $ 87,976 Distributed and undistributed earnings allocated to 373 186 317 570 Net income attributable to common shareholders $ 44,269 $ 29,197 $ 39,974 $ 87,406 Total weighted average outstanding shares 47,415 35,850 43,261 35,829 Less: Weighted average participating securities 397 228 355 237 Basic weighted average common shares 47,018 35,622 42,906 35,592 Dilutive weighted average common stock equivalents 157 50 165 50 Diluted weighted average common shares 47,175 35,672 43,071 35,642 Basic net income per common share $ 0.94 $ 0.82 $ 0.93 $ 2.46 Diluted net income per common share $ 0.94 $ 0.82 $ 0.93 $ 2.45 Anti-dilutive shares 37 8 22 10

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Activity in net accumulated other comprehensive income (loss) and the components of the activity	The following table presents the activity in net accumulated other comprehensive income/ (loss) and the components of the activity for the periods indicated: (In thousands) Unrealized Gains Defined Benefit Total Balance at January 1, 2020 $ 4,000 $ (8,332) $ (4,332) Other comprehensive income before reclassification, net of tax 21,650 — 21,650 Reclassifications from accumulated other comprehensive income, net of tax (322) 497 175 Current period change in other comprehensive income, net of tax 21,328 497 21,825 Balance at September 30, 2020 $ 25,328 $ (7,835) $ 17,493 (In thousands) Unrealized Gains/ Defined Benefit Total Balance at January 1, 2019 $ (6,630) $ (9,124) $ (15,754) Other comprehensive income before reclassification, net of tax 12,475 — 12,475 Reclassifications from accumulated other comprehensive income, net of tax (15) 586 571 Current period change in other comprehensive income, net of tax 12,460 586 13,046 Balance at September 30, 2019 $ 5,830 $ (8,538) $ (2,708)
Schedule of reclassification adjustments out of accumulated other comprehensive income (loss)	The following table provides the information on the reclassification adjustments out of accumulated other comprehensive income/ (loss) for the periods indicated: Nine Months Ended September 30, (In thousands) 2020 2019 Unrealized gains on investments available-for-sale: Affected line item in the Statements of Income: Investment securities gains $ 432 $ 20 Income before taxes 432 20 Tax expense (110) (5) Net income $ 322 $ 15 Amortization of defined benefit pension plan items: Affected line item in the Statements of Income: Recognized actuarial loss (1) $ (656) $ (794) Loss before taxes (656) (794) Tax benefit 159 208 Net loss $ (497) $ (586) (1) This amount is included in the computation of net periodic benefit cost. See Note 11 for additional information on the pension plan.

LEASES (Tables)

LEASES (Tables)	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Lease, Cost	The following table provides information regarding the Company's leases as of the dates indicated: Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Components of lease expense: Operating lease cost (resulting from lease payments) $ 3,154 $ 2,912 $ 9,281 $ 8,605 Supplemental cash flow information related to leases: Operating cash flows from operating leases $ 4,158 $ 2,349 $ 10,160 $ 6,653 ROU assets obtained in the exchange for lease New leases $ — $ — $ — $ — Acquisitions $ — $ — $ 7,720 $ — September 30, 2020 December 31, 2019 Supplemental balance sheet information related to leases: Operating lease ROU assets $ 67,554 $ 69,320 Operating lease liabilities $ 77,506 $ 76,871 Other information related to leases: Weighted average remaining lease term of operating leases 9.6 years 10.4 years Weighted average discount rate of operating leases 3.10% 3.28%
Maturities of operating lease liabilities	At September 30, 2020, the maturities of the Company’s operating lease liabilities were as follows: (In thousands) Amount Maturity: Remaining for 2020 $ 3,280 2021 12,634 2022 11,029 2023 10,882 2024 9,064 Thereafter 44,407 Total undiscounted lease payments 91,296 Less: Present value discount (13,790) Lease Liability $ 77,506

FAIR VALUE (Tables)

FAIR VALUE (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Financial assets and Liabilities at Dates Indicated that were Accounted for at Fair Value	The following tables set forth the Company’s financial assets and liabilities at the dates indicated that were accounted for or disclosed at fair value. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement: September 30, 2020 Quoted Prices in Significant Other Significant (In thousands) (Level 1) (Level 2) (Level 3) Total Assets: Residential mortgage loans held for sale (1) $ — $ 88,728 $ — $ 88,728 Investments available-for-sale: U.S. treasuries and government agencies — 139,405 — 139,405 State and municipal — 352,987 — 352,987 Mortgage-backed and asset-backed — 852,314 — 852,314 Corporate debt — — 12,499 12,499 Total investments available-for-sale — 1,344,706 12,499 1,357,205 Interest rate swap agreements — 10,223 — 10,223 Total assets $ — $ 1,443,657 $ 12,499 $ 1,456,156 Liabilities: Interest rate swap agreements $ — $ (10,223) $ — $ (10,223) Total liabilities $ — $ (10,223) $ — $ (10,223) (1) The outstanding principal balance for residential loans held for sale as of September 30, 2020 was $85.8 million. December 31, 2019 Quoted Prices in Significant Other Significant (In thousands) (Level 1) (Level 2) (Level 3) Total Assets: Residential mortgage loans held for sale $ — $ 53,701 $ — $ 53,701 Investments available-for-sale: U.S. treasuries and government agencies — 258,495 — 258,495 State and municipal — 233,649 — 233,649 Mortgage-backed and asset-backed — 570,759 — 570,759 Corporate debt — — 9,552 9,552 Trust preferred — — 310 310 Total debt securities — 1,062,903 9,862 1,072,765 Marketable equity securities — 568 — 568 Total investments available-for-sale — 1,063,471 9,862 1,073,333 Interest rate swap agreements — 2,507 — 2,507 Total assets $ — $ 1,119,679 $ 9,862 $ 1,129,541 Liabilities: Interest rate swap agreements $ — $ (2,507) $ — $ (2,507) Total liabilities $ — $ (2,507) $ — $ (2,507) (1) The outstanding principal balance for residential loans held for sale as of December 31, 2019 was $52.6 million.
Change in Fair Value of Assets Measured in Condensed Consolidated Statements of Condition at Fair Value on a Recurring Basis	The following table provides a change in the fair value of assets measured in the Condensed Consolidated Statements of Condition at fair value with significant unobservable inputs (Level 3) on a recurring basis for the period indicated: Significant (In thousands) (Level 3) Investments available-for-sale: Balance at January 1, 2020 $ 9,862 Additions of Level 3 assets 3,050 Sales of Level 3 assets (349) Total unrealized loss included in other comprehensive income/ (loss) (64) Balance at September 30, 2020 $ 12,499
Assets Measured at Fair Value on Nonrecurring Basis	The following tables set forth the Company’s financial assets subject to fair value adjustments on a nonrecurring basis at the date indicated that are valued at the lower of cost or market. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement: September 30, 2020 (In thousands) Quoted Prices in Significant Significant Total Total Losses Loans $ — $ — $ 14,325 $ 14,325 $ (11,326) Other real estate owned — — 1,671 1,671 (282) Total $ — $ — $ 15,996 $ 15,996 $ (11,608) December 31, 2019 (In thousands) Quoted Prices in Significant Significant Total Total Losses Loans $ — $ — $ 6,886 $ 6,886 $ (6,299) Other real estate owned — — 1,482 1,482 (281) Total $ — $ — $ 8,368 $ 8,368 $ (6,580)
Carrying Amounts And Fair Values of Company's Financial Instruments	The carrying amounts and fair values of the Company’s financial instruments at the dates indicated are presented in the following tables: Fair Value Measurements September 30, 2020 Quoted Prices in Significant Other Significant (In thousands) Carrying Estimated Financial assets: Cash and cash equivalents $ 224,883 $ 224,883 $ 224,883 $ — $ — Residential mortgage loans held for sale 88,728 88,728 — 88,728 — Investments available-for-sale 1,357,205 1,357,205 — 1,344,706 12,499 Equity securities 68,528 68,528 68,528 — — Loans, net of allowance 10,163,621 10,332,039 — — 10,332,039 Interest rate swap agreements 10,223 10,223 — 10,223 — Accrued interest receivable 48,176 48,176 48,176 — — Bank owned life insurance 126,182 126,182 — 126,182 — Financial liabilities: Time deposits $ 1,868,285 $ 1,889,807 $ — $ 1,889,807 $ — Other deposits 8,096,684 8,096,684 8,096,684 — — Securities sold under retail repurchase agreements and federal funds purchased 462,706 462,889 — 462,889 — Advances from FHLB 444,210 457,875 — 457,875 — Subordinated debt 230,300 234,808 — — 234,808 Interest rate swap agreements 10,223 10,223 — 10,223 — Accrued interest payable 6,822 6,822 6,822 — — Fair Value Measurements December 31, 2019 Quoted Prices in Significant Other Significant (In thousands) Carrying Estimated Financial assets: Cash and cash equivalents $ 146,103 $ 146,103 $ 146,103 $ — $ — Residential mortgage loans held for sale 53,701 53,701 — 53,701 — Investments available-for-sale 1,073,333 1,073,333 — 1,063,471 9,862 Equity securities 51,803 51,803 51,803 — — Loans, net of allowance 6,649,100 6,628,054 — — 6,628,054 Interest rate swap agreements 2,507 2,507 — 2,507 — Accrued interest receivable 23,282 23,282 23,282 — — Bank owned life insurance 113,171 113,171 — 113,171 — Financial liabilities: Time deposits $ 1,542,322 $ 1,547,116 $ — $ 1,547,116 $ — Other deposits 4,897,997 4,897,997 4,897,997 — — Securities sold under retail repurchase agreements and federal funds purchased 213,605 213,605 — 213,605 — Advances from FHLB 513,777 520,729 — 520,729 — Subordinated debt 209,406 200,864 — — 200,864 Interest rate swap agreements 2,507 2,507 — 2,507 — Accrued interest payable 4,194 4,194 4,194 — —

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Operating Segments and Reconciliation of Information to Consolidated Financial Statements	Information for the operating segments and reconciliation of the information to the Condensed Consolidated Financial Statements for the periods indicated are presented in the following tables: Three Months Ended September 30, 2020 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 112,985 $ 1 $ 1 $ (3) $ 112,984 Interest expense 15,503 — — (3) 15,500 Provision for credit losses 7,003 — — — 7,003 Non-interest income 24,746 2,119 2,746 (221) 29,390 Non-interest expense 57,856 1,580 1,722 (221) 60,937 Income before income taxes 57,369 540 1,025 — 58,934 Income tax expense 13,912 149 231 — 14,292 Net income $ 43,457 $ 391 $ 794 $ — $ 44,642 Assets $ 12,678,396 $ 11,289 $ 57,088 $ (68,642) $ 12,678,131 Three Months Ended September 30, 2019 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 87,068 $ 13 $ 4 $ (3) $ 87,082 Interest expense 20,295 — — (3) 20,292 Provision for credit losses 1,524 — — — 1,524 Non-interest income 14,080 2,123 2,538 (168) 18,573 Non-interest expense 41,806 1,635 1,652 (168) 44,925 Income before income taxes 37,523 501 890 — 38,914 Income tax expense 9,162 138 231 — 9,531 Net income $ 28,361 $ 363 $ 659 $ — $ 29,383 Assets $ 8,437,588 $ 11,615 $ 22,033 $ (33,698) $ 8,437,538 Nine Months Ended September 30, 2020 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 311,771 $ 5 $ 3 $ (10) $ 311,769 Interest expense 48,447 — — (10) 48,437 Provision for credit losses 90,158 — — — 90,158 Non-interest income 57,976 5,446 7,705 (645) 70,482 Non-interest expense 184,921 4,319 5,526 (645) 194,121 Income before income taxes 46,221 1,132 2,182 — 49,535 Income tax expense 8,396 313 535 — 9,244 Net income $ 37,825 $ 819 $ 1,647 $ — $ 40,291 Assets $ 12,678,396 $ 11,289 $ 57,088 $ (68,642) $ 12,678,131 Nine Months Ended September 30, 2019 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 262,465 $ 15 $ 9 $ (10) $ 262,479 Interest expense 62,764 — — (10) 62,754 Provision for credit losses 3,029 — — — 3,029 Non-interest income 39,643 5,296 7,660 (501) 52,098 Non-interest expense 123,876 4,359 5,270 (501) 133,004 Income before income taxes 112,439 952 2,399 — 115,790 Income tax expense 26,924 265 625 — 27,814 Net income $ 85,515 $ 687 $ 1,774 $ — $ 87,976 Assets $ 8,437,588 $ 11,615 $ 22,033 $ (33,698) $ 8,437,538

ACQUISITION OF REVERE BANK - Na

ACQUISITION OF REVERE BANK - Narrative (Details) $ / shares in Units, $ in Thousands	Apr. 01, 2020USD ($)$ / sharesshares	Mar. 31, 2020USD ($)bank
Business Acquisition [Line Items]
Closing price (in dollars per share) | $ / shares	$ 22.64
Total transaction value	$ 293,002
Assets	2,846,030
Provisional amount of goodwill recognized	$ 841
Sandy Spring Shareholders
Business Acquisition [Line Items]
Percentage of ownership in combined company	74.00%
Revere shareholders
Business Acquisition [Line Items]
Percentage of ownership in combined company	26.00%
Maryland-based Revere
Business Acquisition [Line Items]
Business acquisition rate of share exchange (in shares) | shares	1.05
Closing price (in dollars per share) | $ / shares	$ 22.64
Total transaction value		$ 293,000
Assets		$ 2,800,000
Number of banking offices | bank		11

ACQUISITION OF REVERE BANK - Pr

ACQUISITION OF REVERE BANK - Provisional fair values of acquired identifiable assets and liabilities assumed (Details) - USD ($) $ / shares in Units, $ in Thousands	Apr. 01, 2020	Sep. 30, 2020
Purchase price:
Fair value of common shares issued (12,768,949 shares) based on Sandy Spring's share price of $22.64	$ 289,089	$ 289,089
Fair value of Revere stock options converted to Sandy Spring stock options	3,611
Cash paid for cashed-out Revere stock options	291
Cash for fractional shares	11
Total purchase price	293,002
Identifiable assets:
Cash and cash equivalents	80,768
Investments available-for-sale	180,752
Loans	2,502,244
Premises and equipment	3,443
Accrued interest receivable	7,651
Core deposit intangible asset	18,360
Other assets	52,812
Total identifiable assets	2,846,030
Identifiable liabilities:
Deposits	2,322,422
Borrowings	205,514
Other liabilities	25,933
Total identifiable liabilities	2,553,869
Provisional fair value of net assets acquired including identifiable intangible assets	292,161
Provisional resulting goodwill	$ 841
Stock issued during period (in shares)	12,768,949	12,768,949
Closing price (in dollars per share)	$ 22.64

INVESTMENTS - Amortized Cost an

INVESTMENTS - Amortized Cost and Estimated Fair Values of Investments Available-for-sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,323,184	$ 1,067,954
Gross Unrealized Gains	36,710	8,984
Gross Unrealized Losses	(2,689)	(3,605)
Estimated Fair Value	1,357,205	1,073,333
U.S. treasuries and government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	140,454	260,294
Gross Unrealized Gains	914	887
Gross Unrealized Losses	(1,963)	(2,686)
Estimated Fair Value	139,405	258,495
State and municipal
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	344,168	229,309
Gross Unrealized Gains	9,435	4,377
Gross Unrealized Losses	(616)	(37)
Estimated Fair Value	352,987	233,649
Mortgage-backed and asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	826,450	568,373
Gross Unrealized Gains	25,967	3,268
Gross Unrealized Losses	(103)	(882)
Estimated Fair Value	852,314	570,759
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,112	9,100
Gross Unrealized Gains	394	452
Gross Unrealized Losses	(7)	0
Estimated Fair Value	12,499	9,552
Trust preferred
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	310
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	0	310
Debt Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,323,184	1,067,386
Gross Unrealized Gains	36,710	8,984
Gross Unrealized Losses	(2,689)	(3,605)
Estimated Fair Value	1,357,205	1,072,765
Marketable equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	568
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 0	$ 568

INVESTMENTS - Narrative (Detail

INVESTMENTS - Narrative (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Separate Account Investment [Line Items]
Investments available-for-sale book value	$ 421	$ 424.8
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations | Collateralized Mortgage Obligations
Fair Value, Separate Account Investment [Line Items]
Mortgage-backed securities	328.7
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations | Collateralized Mortgage Backed Securities
Fair Value, Separate Account Investment [Line Items]
Mortgage-backed securities	455.8
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations | SBA asset backed securities
Fair Value, Separate Account Investment [Line Items]
Mortgage-backed securities	$ 67.8

INVESTMENTS - Gross Unrealized

INVESTMENTS - Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities (Detail) $ in Thousands	Sep. 30, 2020USD ($)security	Dec. 31, 2019USD ($)security
Debt Securities, Available-for-sale [Line Items]
Number of Securities | security	41	50
Fair Value
Less Than 12 Months	$ 88,891	$ 248,365
12 Months or More	98,223	94,778
Total	187,114	343,143
Unrealized Losses
Less Than 12 Months	700	2,756
12 Months or More	1,989	849
Total	$ 2,689	$ 3,605
U.S. treasuries and government agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities | security	7	12
Fair Value
Less Than 12 Months	$ 0	$ 133,221
12 Months or More	91,193	17,911
Total	91,193	151,132
Unrealized Losses
Less Than 12 Months	0	2,211
12 Months or More	1,963	475
Total	$ 1,963	$ 2,686
State and municipal
Debt Securities, Available-for-sale [Line Items]
Number of Securities | security	19	3
Fair Value
Less Than 12 Months	$ 57,024	$ 7,227
12 Months or More	0	0
Total	57,024	7,227
Unrealized Losses
Less Than 12 Months	616	37
12 Months or More	0	0
Total	$ 616	$ 37
Mortgage-backed and asset-backed
Debt Securities, Available-for-sale [Line Items]
Number of Securities | security	13	35
Fair Value
Less Than 12 Months	$ 28,862	$ 107,917
12 Months or More	7,030	76,867
Total	35,892	184,784
Unrealized Losses
Less Than 12 Months	77	508
12 Months or More	26	374
Total	$ 103	$ 882
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Number of Securities | security	2
Fair Value
Less Than 12 Months	$ 3,005
12 Months or More	0
Total	3,005
Unrealized Losses
Less Than 12 Months	7
12 Months or More	0
Total	$ 7

INVESTMENTS - Estimated fair va

INVESTMENTS - Estimated fair values of debt securities available-for-sale by contractual maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value
Total available-for-sale debt securities	$ 1,357,205	$ 1,072,765
Amortized Cost
Total available-for-sale debt securities	1,323,184	1,067,386
U.S. treasuries and government agencies
Fair Value
One year or less	28,139	69,799
One to five years	11,902	96,709
Five to ten years	0	0
After ten years	99,364	91,987
Amortized Cost
One year or less	27,974	69,330
One to five years	11,380	96,507
Five to ten years	0	0
After ten years	101,100	94,457
State and municipal
Fair Value
One year or less	18,663	33,311
One to five years	47,558	76,723
Five to ten years	59,670	75,820
After ten years	227,096	47,795
Amortized Cost
One year or less	18,457	33,054
One to five years	46,440	75,432
Five to ten years	56,731	73,741
After ten years	222,540	47,082
Mortgage-backed and asset-backed
Fair Value
One year or less	2	852
One to five years	21,191	7,125
Five to ten years	58,878	55,226
After ten years	772,243	507,556
Amortized Cost
One year or less	2	822
One to five years	20,800	6,969
Five to ten years	57,430	54,799
After ten years	748,218	505,783
Corporate debt
Fair Value
One year or less	0	0
One to five years	0	0
Five to ten years	12,499	9,552
After ten years	0	0
Amortized Cost
One year or less	0	0
One to five years	0	0
Five to ten years	12,112	9,100
After ten years	0	0
Trust preferred
Fair Value
One year or less	0	0
One to five years	0	0
Five to ten years	0	0
After ten years	0	310
Amortized Cost
One year or less	0	0
One to five years	0	0
Five to ten years	0	0
After ten years	$ 0	$ 310

INVESTMENTS (Other Equity Secur

INVESTMENTS (Other Equity Securities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Federal Home Loan Bank Stock and Federal Reserve Bank Stock [Abstract]
Federal Reserve Bank stock	$ 38,650	$ 22,559
Federal Home Loan Bank of Atlanta stock	29,201	29,244
Marketable equity securities	677	0
Total equity securities	$ 68,528	$ 51,803

LOANS - Narrative (Detail)

LOANS - Narrative (Detail) - USD ($) $ in Thousands	Apr. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Net deferred loan fees		$ 28,300		$ 1,800
Loans receivable with a gross amortized cost basis	$ 2,500,000
PCD Loans acquired	974,800
Initial allowance on acquired Revere PCD loans	18,600	18,628	$ 0
Fair value premium	4,500
Total fair value of PCD loans as of the Acquisition Date	960,700	901,900
PCD remaining unamortized fair value premium		4,000
PCD loans non-accruing at the time of acquisition	11,300
Non-PCD loans	1,500,000	1,400,000
Net fair value premium	$ 2,100
Non-PCD remaining unamortized fair value premium		1,500
Paycheck Protection Program
Loans and Leases Receivable Disclosure [Line Items]
Net deferred loan fees		$ 25,500

LOANS (Loan Portfolio Segment B

LOANS (Loan Portfolio Segment Balances) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 10,333,935	$ 6,705,232
Commercial real estate: | Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,588,702	2,169,156
Commercial real estate: | Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,652,208	1,288,677
Commercial real estate: | Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	994,800	684,010
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,462,956	4,942,862
Commercial | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,227,246	801,019
Residential real estate: | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,173,857	1,149,327
Residential real estate: | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	175,123	146,279
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	521,999	466,764
Total residential and consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,870,979	$ 1,762,370

CREDIT QUALITY ASSESSMENT - All

CREDIT QUALITY ASSESSMENT - Allowance for credit loss activity (Detail) - USD ($) $ in Thousands	Apr. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 56,132	$ 53,486	$ 53,486
Initial allowance on acquired Revere PCD loans	$ 18,600			18,628	0
Provision for credit losses		$ 7,003	$ 1,524	90,158	3,029	4,684
Loan charge-offs				(1,255)	(2,101)	(2,668)
Loan recoveries				906	578	630
Net charge-offs				(349)	(1,523)	(2,038)
Balance at period end		170,314	$ 54,992	170,314	54,992	56,132
Initial allowance on PCD loans at adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				2,762	0	0
Balance at period end		$ 2,762		2,762		2,762
Transition impact of adopting ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 2,983	$ 0	0
Balance at period end						$ 2,983

CREDIT QUALITY ASSESSMENT - Col

CREDIT QUALITY ASSESSMENT - Collateral Dependent Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Credit Loss [Abstract]
Collateral dependent loans individually evaluated for credit loss with an allowance	$ 25,823	$ 15,333
Collateral dependent loans individually evaluated for credit loss without an allowance	30,299	9,440
Total individually evaluated collateral dependent loans	56,122	24,773
Allowance for credit losses related to loans evaluated individually	8,263	5,501
Allowance for credit losses related to loans evaluated collectively	162,051	50,631
Total allowance for credit losses	$ 170,314	$ 56,132	$ 54,992	$ 53,486

CREDIT QUALITY ASSESSMENT - A_2

CREDIT QUALITY ASSESSMENT - Allowance for Credit or Loan Losses by Respective Loan Portfolio Segment (Detail) - USD ($) $ in Thousands	Apr. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 56,132	$ 53,486	$ 53,486
Initial allowance on acquired Revere PCD loans	$ 18,600			18,628	0
Provision for credit losses		$ 7,003	$ 1,524	90,158	3,029	4,684
Charge-offs				(1,255)	(2,101)	(2,668)
Recoveries				906	578	630
Net recoveries (charge-offs)				(349)	(1,523)	(2,038)
Balance at period end		170,314	$ 54,992	170,314	54,992	56,132
Total loans		$ 10,333,935		$ 10,333,935		$ 6,705,232
Allowance for credit losses to total loans ratio		1.65%		1.65%		0.84%
Balance of loans individually evaluated for credit loss		$ 56,122		$ 56,122		$ 24,773
Allowance related to loans evaluated individually		$ 8,263		$ 8,263		5,501
Individual allowance to loans evaluated individually ratio		14.72%		14.72%
Balance of loans collectively evaluated for credit loss		$ 10,277,813		$ 10,277,813
Allowance related to loans evaluated collectively		$ 162,051		$ 162,051		50,631
Balance of loans specifically evaluated for impairment						24,773
Allowance for loans specifically evaluated for impairment						$ 5,501
Specific allowance to specific loans ratio						22.21%
Balance of loans collectively evaluated						$ 6,667,375
Allowance for loans collectively evaluated						$ 50,631
Collective allowance to loans evaluated collectively ratio		1.58%		1.58%		0.76%
Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance of loans acquired with deteriorated credit quality						$ 13,084
Allowance for loans acquired with deteriorated credit quality						$ 0
Allowance to loan acquired with deteriorated credit quality ratio						0.00%
Initial allowance on PCD loans at adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 2,762	0	$ 0
Balance at period end		$ 2,762		2,762		2,762
Transition impact of adopting ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				2,983	0	0
Balance at period end						2,983
Commercial real estate: | Commercial investor real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				18,407	17,603	17,603
Initial allowance on acquired Revere PCD loans				7,973
Provision for credit losses				30,884		788
Charge-offs				(23)		0
Recoveries				6		16
Net recoveries (charge-offs)				(17)		16
Balance at period end		55,236		55,236		18,407
Total loans		$ 3,588,702		$ 3,588,702		$ 2,169,156
Allowance for credit losses to total loans ratio		1.54%		1.54%		0.85%
Balance of loans individually evaluated for credit loss		$ 27,508		$ 27,508
Allowance related to loans evaluated individually		$ 2,537		$ 2,537
Individual allowance to loans evaluated individually ratio		9.22%		9.22%
Balance of loans collectively evaluated for credit loss		$ 3,561,194		$ 3,561,194
Allowance related to loans evaluated collectively		$ 52,699		$ 52,699
Balance of loans specifically evaluated for impairment						$ 9,212
Allowance for loans specifically evaluated for impairment						$ 1,529
Specific allowance to specific loans ratio						16.60%
Balance of loans collectively evaluated						$ 2,150,400
Allowance for loans collectively evaluated						$ 16,878
Collective allowance to loans evaluated collectively ratio		1.48%		1.48%		0.78%
Commercial real estate: | Commercial investor real estate | Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance of loans acquired with deteriorated credit quality						$ 9,544
Allowance for loans acquired with deteriorated credit quality						$ 0
Allowance to loan acquired with deteriorated credit quality ratio						0.00%
Commercial real estate: | Commercial investor real estate | Initial allowance on PCD loans at adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 1,114
Balance at period end						$ 1,114
Commercial real estate: | Commercial investor real estate | Transition impact of adopting ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				(3,125)
Balance at period end						(3,125)
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				6,884	6,307	6,307
Initial allowance on acquired Revere PCD loans				2,782
Provision for credit losses				9,600		577
Charge-offs				0		0
Recoveries				0		0
Net recoveries (charge-offs)				0		0
Balance at period end		$ 19,653		19,653		6,884
Total loans		$ 1,652,208		$ 1,652,208		$ 1,288,677
Allowance for credit losses to total loans ratio		1.19%		1.19%		0.53%
Balance of loans individually evaluated for credit loss		$ 6,511		$ 6,511
Allowance related to loans evaluated individually		$ 22		$ 22
Individual allowance to loans evaluated individually ratio		0.34%		0.34%
Balance of loans collectively evaluated for credit loss		$ 1,645,697		$ 1,645,697
Allowance related to loans evaluated collectively		$ 19,631		$ 19,631
Balance of loans specifically evaluated for impairment						$ 4,148
Allowance for loans specifically evaluated for impairment						$ 23
Specific allowance to specific loans ratio						0.55%
Balance of loans collectively evaluated						$ 1,284,529
Allowance for loans collectively evaluated						$ 6,861
Collective allowance to loans evaluated collectively ratio		1.19%		1.19%		0.53%
Commercial real estate: | Commercial owner-occupied real estate | Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance of loans acquired with deteriorated credit quality						$ 0
Allowance for loans acquired with deteriorated credit quality						$ 0
Allowance to loan acquired with deteriorated credit quality ratio						0.00%
Commercial real estate: | Commercial owner-occupied real estate | Initial allowance on PCD loans at adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 0
Balance at period end						$ 0
Commercial real estate: | Commercial owner-occupied real estate | Transition impact of adopting ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				387
Balance at period end						387
Commercial real estate: | Commercial AD&C
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				7,590	5,944	5,944
Initial allowance on acquired Revere PCD loans				1,248
Provision for credit losses				7,377		1,418
Charge-offs				0		0
Recoveries				0		228
Net recoveries (charge-offs)				0		228
Balance at period end		$ 18,791		18,791		7,590
Total loans		$ 994,800		$ 994,800		$ 684,010
Allowance for credit losses to total loans ratio		1.89%		1.89%		1.11%
Balance of loans individually evaluated for credit loss		$ 1,678		$ 1,678
Allowance related to loans evaluated individually		$ 603		$ 603
Individual allowance to loans evaluated individually ratio		35.94%		35.94%
Balance of loans collectively evaluated for credit loss		$ 993,122		$ 993,122
Allowance related to loans evaluated collectively		$ 18,188		$ 18,188
Balance of loans specifically evaluated for impairment						$ 829
Allowance for loans specifically evaluated for impairment						$ 132
Specific allowance to specific loans ratio						15.92%
Balance of loans collectively evaluated						$ 683,181
Allowance for loans collectively evaluated						$ 7,458
Collective allowance to loans evaluated collectively ratio		1.83%		1.83%		1.09%
Commercial real estate: | Commercial AD&C | Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance of loans acquired with deteriorated credit quality						$ 0
Allowance for loans acquired with deteriorated credit quality						$ 0
Allowance to loan acquired with deteriorated credit quality ratio						0.00%
Commercial real estate: | Commercial AD&C | Initial allowance on PCD loans at adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 0
Balance at period end						$ 0
Commercial real estate: | Commercial AD&C | Transition impact of adopting ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				2,576
Balance at period end						2,576
Commercial Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Total loans		$ 8,462,956		8,462,956		4,942,862
Balance of loans individually evaluated for credit loss		18,728		18,728
Allowance related to loans evaluated individually		5,101		5,101
Commercial Business | Commercial business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				11,395	11,377	11,377
Initial allowance on acquired Revere PCD loans				6,289
Provision for credit losses				34,671		1,164
Charge-offs				(429)		(1,195)
Recoveries				696		49
Net recoveries (charge-offs)				267		(1,146)
Balance at period end		57,159		57,159		11,395
Total loans		$ 2,227,246		$ 2,227,246		$ 801,019
Allowance for credit losses to total loans ratio		2.57%		2.57%		1.42%
Balance of loans individually evaluated for credit loss		$ 18,728		$ 18,728
Allowance related to loans evaluated individually		$ 5,101		$ 5,101
Individual allowance to loans evaluated individually ratio		27.24%		27.24%
Balance of loans collectively evaluated for credit loss		$ 2,208,518		$ 2,208,518
Allowance related to loans evaluated collectively		$ 52,058		$ 52,058
Balance of loans specifically evaluated for impairment						$ 8,867
Allowance for loans specifically evaluated for impairment						$ 3,817
Specific allowance to specific loans ratio						43.05%
Balance of loans collectively evaluated						$ 789,613
Allowance for loans collectively evaluated						$ 7,578
Collective allowance to loans evaluated collectively ratio		2.36%		2.36%		0.96%
Commercial Business | Commercial business | Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance of loans acquired with deteriorated credit quality						$ 2,539
Allowance for loans acquired with deteriorated credit quality						$ 0
Allowance to loan acquired with deteriorated credit quality ratio						0.00%
Commercial Business | Commercial business | Initial allowance on PCD loans at adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 1,549
Balance at period end						$ 1,549
Commercial Business | Commercial business | Transition impact of adopting ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				2,988
Balance at period end						2,988
Residential real estate: | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				8,803	8,881	8,881
Initial allowance on acquired Revere PCD loans				243
Provision for credit losses				3,595		474
Charge-offs				(420)		(690)
Recoveries				78		138
Net recoveries (charge-offs)				(342)		(552)
Balance at period end		$ 11,911		11,911		8,803
Total loans		$ 1,173,857		$ 1,173,857		$ 1,149,327
Allowance for credit losses to total loans ratio		1.01%		1.01%		0.77%
Balance of loans individually evaluated for credit loss		$ 1,333		$ 1,333
Allowance related to loans evaluated individually		$ 0		$ 0
Individual allowance to loans evaluated individually ratio		0.00%		0.00%
Balance of loans collectively evaluated for credit loss		$ 1,172,524		$ 1,172,524
Allowance related to loans evaluated collectively		$ 11,911		$ 11,911
Balance of loans specifically evaluated for impairment						$ 1,717
Allowance for loans specifically evaluated for impairment						$ 0
Specific allowance to specific loans ratio						0.00%
Balance of loans collectively evaluated						$ 1,147,602
Allowance for loans collectively evaluated						$ 8,803
Collective allowance to loans evaluated collectively ratio		1.02%		1.02%		0.77%
Residential real estate: | Residential mortgage | Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance of loans acquired with deteriorated credit quality						$ 8
Allowance for loans acquired with deteriorated credit quality						$ 0
Allowance to loan acquired with deteriorated credit quality ratio						0.00%
Residential real estate: | Residential mortgage | Initial allowance on PCD loans at adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 0
Balance at period end						$ 0
Residential real estate: | Residential mortgage | Transition impact of adopting ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				(388)
Balance at period end						(388)
Residential real estate: | Residential construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				967	1,261	1,261
Initial allowance on acquired Revere PCD loans				6
Provision for credit losses				761		(302)
Charge-offs				0		0
Recoveries				5		8
Net recoveries (charge-offs)				5		8
Balance at period end		$ 1,464		1,464		967
Total loans		$ 175,123		$ 175,123		$ 146,279
Allowance for credit losses to total loans ratio		0.84%		0.84%		0.66%
Balance of loans individually evaluated for credit loss		$ 0		$ 0
Allowance related to loans evaluated individually		$ 0		$ 0
Individual allowance to loans evaluated individually ratio		0.00%		0.00%
Balance of loans collectively evaluated for credit loss		$ 175,123		$ 175,123
Allowance related to loans evaluated collectively		$ 1,464		$ 1,464
Balance of loans specifically evaluated for impairment						$ 0
Allowance for loans specifically evaluated for impairment						$ 0
Specific allowance to specific loans ratio						0.00%
Balance of loans collectively evaluated						$ 146,279
Allowance for loans collectively evaluated						$ 967
Collective allowance to loans evaluated collectively ratio		0.84%		0.84%		0.66%
Residential real estate: | Residential construction | Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance of loans acquired with deteriorated credit quality						$ 0
Allowance for loans acquired with deteriorated credit quality						$ 0
Allowance to loan acquired with deteriorated credit quality ratio						0.00%
Residential real estate: | Residential construction | Initial allowance on PCD loans at adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 0
Balance at period end						$ 0
Residential real estate: | Residential construction | Transition impact of adopting ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				(275)
Balance at period end						(275)
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				2,086	$ 2,113	2,113
Initial allowance on acquired Revere PCD loans				87
Provision for credit losses				3,270		565
Charge-offs				(383)		(783)
Recoveries				121		191
Net recoveries (charge-offs)				(262)		(592)
Balance at period end		$ 6,100		6,100		2,086
Total loans		$ 521,999		$ 521,999		$ 466,764
Allowance for credit losses to total loans ratio		1.17%		1.17%		0.45%
Balance of loans individually evaluated for credit loss		$ 364		$ 364
Allowance related to loans evaluated individually		$ 0		$ 0
Individual allowance to loans evaluated individually ratio		0.00%		0.00%
Balance of loans collectively evaluated for credit loss		$ 521,635		$ 521,635
Allowance related to loans evaluated collectively		$ 6,100		$ 6,100
Balance of loans specifically evaluated for impairment						$ 0
Allowance for loans specifically evaluated for impairment						$ 0
Specific allowance to specific loans ratio						0.00%
Balance of loans collectively evaluated						$ 465,771
Allowance for loans collectively evaluated						$ 2,086
Collective allowance to loans evaluated collectively ratio		1.17%		1.17%		0.45%
Consumer | Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance of loans acquired with deteriorated credit quality						$ 993
Allowance for loans acquired with deteriorated credit quality						$ 0
Allowance to loan acquired with deteriorated credit quality ratio						0.00%
Consumer | Initial allowance on PCD loans at adoption of ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 99
Balance at period end						$ 99
Consumer | Transition impact of adopting ASC 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 820
Balance at period end						$ 820

CREDIT QUALITY ASSESSMENT - C_2

CREDIT QUALITY ASSESSMENT - Collateral dependent loans individually evaluated for credit loss (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	$ 25,823	$ 15,333
Allowance related to loans evaluated individually	8,263	5,501
Loans individually evaluated for credit loss without an allowance	30,299	9,440
Total individually evaluated collateral dependent loans	56,122	$ 24,773
Total unpaid contractual principal balance	75,551
Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	22,057
Loans individually evaluated for credit loss without an allowance	25,618
Total individually evaluated collateral dependent loans	47,675
Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	2,828
Loans individually evaluated for credit loss without an allowance	2,765
Total individually evaluated collateral dependent loans	5,593
Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	938
Loans individually evaluated for credit loss without an allowance	1,916
Total individually evaluated collateral dependent loans	2,854
Commercial real estate: | Commercial investor real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	14,991
Allowance related to loans evaluated individually	2,537
Loans individually evaluated for credit loss without an allowance	12,517
Total individually evaluated collateral dependent loans	27,508
Total unpaid contractual principal balance	33,452
Commercial real estate: | Commercial investor real estate | Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	14,267
Loans individually evaluated for credit loss without an allowance	11,417
Total individually evaluated collateral dependent loans	25,684
Commercial real estate: | Commercial investor real estate | Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	724
Loans individually evaluated for credit loss without an allowance	376
Total individually evaluated collateral dependent loans	1,100
Commercial real estate: | Commercial investor real estate | Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	724
Total individually evaluated collateral dependent loans	724
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	853
Allowance related to loans evaluated individually	22
Loans individually evaluated for credit loss without an allowance	5,658
Total individually evaluated collateral dependent loans	6,511
Total unpaid contractual principal balance	10,203
Commercial real estate: | Commercial owner-occupied real estate | Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	4,194
Total individually evaluated collateral dependent loans	4,194
Commercial real estate: | Commercial owner-occupied real estate | Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	853
Loans individually evaluated for credit loss without an allowance	1,464
Total individually evaluated collateral dependent loans	2,317
Commercial real estate: | Commercial owner-occupied real estate | Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Commercial real estate: | Commercial AD&C
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	1,678
Allowance related to loans evaluated individually	603
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	1,678
Total unpaid contractual principal balance	1,678
Commercial real estate: | Commercial AD&C | Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	1,678
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	1,678
Commercial real estate: | Commercial AD&C | Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Commercial real estate: | Commercial AD&C | Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Commercial Business
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	8,301
Allowance related to loans evaluated individually	5,101
Loans individually evaluated for credit loss without an allowance	10,427
Total individually evaluated collateral dependent loans	18,728
Total unpaid contractual principal balance	27,171
Commercial Business | Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	6,112
Loans individually evaluated for credit loss without an allowance	10,007
Total individually evaluated collateral dependent loans	16,119
Commercial Business | Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	1,251
Loans individually evaluated for credit loss without an allowance	289
Total individually evaluated collateral dependent loans	1,540
Commercial Business | Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	938
Loans individually evaluated for credit loss without an allowance	131
Total individually evaluated collateral dependent loans	1,069
Residential real estate: | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Allowance related to loans evaluated individually	0
Loans individually evaluated for credit loss without an allowance	1,333
Total individually evaluated collateral dependent loans	1,333
Total unpaid contractual principal balance	2,683
Residential real estate: | Residential mortgage | Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Residential real estate: | Residential mortgage | Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	272
Total individually evaluated collateral dependent loans	272
Residential real estate: | Residential mortgage | Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	1,061
Total individually evaluated collateral dependent loans	1,061
Residential real estate: | Residential construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Allowance related to loans evaluated individually	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Total unpaid contractual principal balance	0
Residential real estate: | Residential construction | Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Residential real estate: | Residential construction | Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Residential real estate: | Residential construction | Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Allowance related to loans evaluated individually	0
Loans individually evaluated for credit loss without an allowance	364
Total individually evaluated collateral dependent loans	364
Total unpaid contractual principal balance	364
Consumer | Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	0
Consumer | Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	364
Total individually evaluated collateral dependent loans	364
Consumer | Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0
Loans individually evaluated for credit loss without an allowance	0
Total individually evaluated collateral dependent loans	$ 0

CREDIT QUALITY ASSESSMENT (Non-

CREDIT QUALITY ASSESSMENT (Non-accrual Loans) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	$ 62,612
Contractual interest income due on non- accrual loans during the period	3,420
Commercial real estate: | Commercial investor real estate
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	22,254
Contractual interest income due on non- accrual loans during the period	1,496
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	5,366
Contractual interest income due on non- accrual loans during the period	368
Commercial real estate: | Commercial AD&C
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	1,573
Contractual interest income due on non- accrual loans during the period	67
Commercial Business
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	14,932
Contractual interest income due on non- accrual loans during the period	750
Residential real estate: | Residential mortgage
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	11,990
Contractual interest income due on non- accrual loans during the period	447
Residential real estate: | Residential construction
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	0
Contractual interest income due on non- accrual loans during the period	0
Consumer
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	6,497
Contractual interest income due on non- accrual loans during the period	$ 292

CREDIT QUALITY ASSESSMENT - Nar

CREDIT QUALITY ASSESSMENT - Narrative (Detail) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans placed on non-accrual		$ 30,500,000
Reversal of uncollected accrued interest		300,000
Period increase (decrease)	$ 0
Other real estate owned		1,389,000	$ 1,482,000
Consumer mortgage loan		100,000
Restructured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans restructured during the period		2,800,000	2,400,000
Individual reserves		900,000	400,000
Other real estate owned		$ 1,400,000	$ 1,500,000

CREDIT QUALITY ASSESSMENT - Rec

CREDIT QUALITY ASSESSMENT - Recorded Investment with Respect to Impaired loans, Associated Allowance by Applicable Portfolio Segment (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	$ 15,333
Allowance	5,501
Impaired loans without a specific allowance:	9,440
Total impaired loans:	24,773
Unpaid principal balance in total impaired loans	34,620
Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	12,652
Impaired loans without a specific allowance:	4,188
Total impaired loans:	16,840
Restructured | Accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	266
Impaired loans without a specific allowance:	2,370
Total impaired loans:	2,636
Restructured | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	2,415
Impaired loans without a specific allowance:	2,882
Total impaired loans:	5,297
All Other Loans
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	0
Allowance	0
Impaired loans without a specific allowance:	1,717
Total impaired loans:	1,717
Unpaid principal balance in total impaired loans	2,618
All Other Loans | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	0
Impaired loans without a specific allowance:	0
Total impaired loans:	0
All Other Loans | Restructured | Accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	0
Impaired loans without a specific allowance:	1,444
Total impaired loans:	1,444
All Other Loans | Restructured | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	0
Impaired loans without a specific allowance:	273
Total impaired loans:	273
Commercial real estate: | Commercial investor real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	5,885
Allowance	1,529
Impaired loans without a specific allowance:	3,327
Total impaired loans:	9,212
Unpaid principal balance in total impaired loans	13,805
Commercial real estate: | Commercial investor real estate | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	5,448
Impaired loans without a specific allowance:	2,552
Total impaired loans:	8,000
Commercial real estate: | Commercial investor real estate | Restructured | Accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	0
Impaired loans without a specific allowance:	775
Total impaired loans:	775
Commercial real estate: | Commercial investor real estate | Restructured | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	437
Impaired loans without a specific allowance:	0
Total impaired loans:	437
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	889
Allowance	23
Impaired loans without a specific allowance:	3,259
Total impaired loans:	4,148
Unpaid principal balance in total impaired loans	6,072
Commercial real estate: | Commercial owner-occupied real estate | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	767
Impaired loans without a specific allowance:	1,522
Total impaired loans:	2,289
Commercial real estate: | Commercial owner-occupied real estate | Restructured | Accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	0
Impaired loans without a specific allowance:	0
Total impaired loans:	0
Commercial real estate: | Commercial owner-occupied real estate | Restructured | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	122
Impaired loans without a specific allowance:	1,737
Total impaired loans:	1,859
Commercial real estate: | Commercial AD&C
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	829
Allowance	132
Impaired loans without a specific allowance:	0
Total impaired loans:	829
Unpaid principal balance in total impaired loans	829
Commercial real estate: | Commercial AD&C | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	829
Impaired loans without a specific allowance:	0
Total impaired loans:	829
Commercial real estate: | Commercial AD&C | Restructured | Accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	0
Impaired loans without a specific allowance:	0
Total impaired loans:	0
Commercial real estate: | Commercial AD&C | Restructured | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	0
Impaired loans without a specific allowance:	0
Total impaired loans:	0
Commercial Business
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	7,730
Allowance	3,817
Impaired loans without a specific allowance:	1,137
Total impaired loans:	8,867
Unpaid principal balance in total impaired loans	11,296
Commercial Business | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	5,608
Impaired loans without a specific allowance:	114
Total impaired loans:	5,722
Commercial Business | Restructured | Accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	266
Impaired loans without a specific allowance:	151
Total impaired loans:	417
Commercial Business | Restructured | Non-accruing
Financing Receivable, Impaired [Line Items]
Impaired loans with a specific allowance:	1,856
Impaired loans without a specific allowance:	872
Total impaired loans:	$ 2,728

CREDIT QUALITY ASSESSMENT - Imp

CREDIT QUALITY ASSESSMENT - Impaired Loans by Portfolio (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Financing Receivable, Impaired [Line Items]
Average impaired loans for the period	$ 23,365
Contractual interest income due on impaired loans during the period	1,947
Interest income on impaired loans recognized on an accrual basis	169
All Other Loans
Financing Receivable, Impaired [Line Items]
Average impaired loans for the period	1,577
Contractual interest income due on impaired loans during the period	128
Interest income on impaired loans recognized on an accrual basis	68
Commercial real estate: | Commercial investor real estate
Financing Receivable, Impaired [Line Items]
Average impaired loans for the period	7,565
Contractual interest income due on impaired loans during the period	786
Interest income on impaired loans recognized on an accrual basis	39
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Impaired [Line Items]
Average impaired loans for the period	4,390
Contractual interest income due on impaired loans during the period	258
Interest income on impaired loans recognized on an accrual basis	0
Commercial real estate: | Commercial AD&C
Financing Receivable, Impaired [Line Items]
Average impaired loans for the period	2,052
Contractual interest income due on impaired loans during the period	127
Interest income on impaired loans recognized on an accrual basis	0
Commercial Business
Financing Receivable, Impaired [Line Items]
Average impaired loans for the period	7,781
Contractual interest income due on impaired loans during the period	648
Interest income on impaired loans recognized on an accrual basis	$ 62

CREDIT QUALITY ASSESSMENT - Inf

CREDIT QUALITY ASSESSMENT - Information on the credit quality of loan portfolio under the new CECL (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 38,632
Loans placed on non-accrual	30,500
Commercial real estate: | Commercial investor real estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	8,437
Commercial real estate: | Commercial owner-occupied real estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	4,148
Commercial real estate: | Commercial AD&C
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	829
Commercial Business
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	8,450
Residential real estate: | Residential mortgage
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	12,661
Residential real estate: | Residential construction
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	0
Consumer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	4,107
Non-accrual status
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	38,632
PCD loans designed as non-accrual	13,084
Loans placed on non-accrual	30,551
Non-accrual balances transferred to OREO	0
Non-accrual balances charged-off	(881)
Net payments or draws	(7,989)
Non-accrual loans brought current	(1,976)
Balance at end of period	71,421
Non-accrual status | Commercial real estate: | Commercial investor real estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	8,437
PCD loans designed as non-accrual	9,544
Loans placed on non-accrual	9,437
Non-accrual balances transferred to OREO	0
Non-accrual balances charged-off	(23)
Net payments or draws	(611)
Non-accrual loans brought current	0
Balance at end of period	26,784
Non-accrual status | Commercial real estate: | Commercial owner-occupied real estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	4,148
PCD loans designed as non-accrual	0
Loans placed on non-accrual	3,425
Non-accrual balances transferred to OREO	0
Non-accrual balances charged-off	0
Net payments or draws	(961)
Non-accrual loans brought current	(101)
Balance at end of period	6,511
Non-accrual status | Commercial real estate: | Commercial AD&C
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	829
PCD loans designed as non-accrual	0
Loans placed on non-accrual	2,128
Non-accrual balances transferred to OREO	0
Non-accrual balances charged-off	0
Net payments or draws	(1,279)
Non-accrual loans brought current	0
Balance at end of period	1,678
Non-accrual status | Commercial Business
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	8,450
PCD loans designed as non-accrual	2,539
Loans placed on non-accrual	10,988
Non-accrual balances transferred to OREO	0
Non-accrual balances charged-off	(386)
Net payments or draws	(3,052)
Non-accrual loans brought current	(880)
Balance at end of period	17,659
Non-accrual status | Residential real estate: | Residential mortgage
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	12,661
PCD loans designed as non-accrual	8
Loans placed on non-accrual	896
Non-accrual balances transferred to OREO	0
Non-accrual balances charged-off	(351)
Net payments or draws	(1,058)
Non-accrual loans brought current	(860)
Balance at end of period	11,296
Non-accrual status | Residential real estate: | Residential construction
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	0
PCD loans designed as non-accrual	0
Loans placed on non-accrual	0
Non-accrual balances transferred to OREO	0
Non-accrual balances charged-off	0
Net payments or draws	0
Non-accrual loans brought current	0
Balance at end of period	0
Non-accrual status | Consumer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	4,107
PCD loans designed as non-accrual	993
Loans placed on non-accrual	3,677
Non-accrual balances transferred to OREO	0
Non-accrual balances charged-off	(121)
Net payments or draws	(1,028)
Non-accrual loans brought current	(135)
Balance at end of period	$ 7,493

CREDIT QUALITY ASSESSMENT (Cred

CREDIT QUALITY ASSESSMENT (Credit Quality of Loan Portfolio, New) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Past due		$ 27,748
Non-accrual loans		38,632
Loans greater than 90 days past due		0
Restructured loans		2,636
Total loans	$ 10,333,935	6,705,232
Performing loans:
Financing Receivable, Past Due [Line Items]
Current	10,221,551
Total performing loans	10,259,246
Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	71,421
Loans greater than 90 days past due	414
Restructured loans	2,854
Total non-performing loans	74,689
30-59 days
Financing Receivable, Past Due [Line Items]
Past due		19,986
30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	30,188
60-89 days
Financing Receivable, Past Due [Line Items]
Past due		7,762
60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	7,507
Commercial real estate: | Commercial investor real estate
Financing Receivable, Past Due [Line Items]
Past due		932
Non-accrual loans		8,437
Loans greater than 90 days past due		0
Restructured loans		775
Total loans	3,588,702	2,169,156
Commercial real estate: | Commercial investor real estate | Performing loans:
Financing Receivable, Past Due [Line Items]
Current	3,555,815
Total performing loans	3,561,194
Commercial real estate: | Commercial investor real estate | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	26,784
Loans greater than 90 days past due	0
Restructured loans	724
Total non-performing loans	27,508
Commercial real estate: | Commercial investor real estate | 30-59 days
Financing Receivable, Past Due [Line Items]
Past due		932
Commercial real estate: | Commercial investor real estate | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	4,181
Commercial real estate: | Commercial investor real estate | 60-89 days
Financing Receivable, Past Due [Line Items]
Past due		0
Commercial real estate: | Commercial investor real estate | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	1,198
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Past Due [Line Items]
Past due		316
Non-accrual loans		4,148
Loans greater than 90 days past due		0
Restructured loans		0
Total loans	1,652,208	1,288,677
Commercial real estate: | Commercial owner-occupied real estate | Performing loans:
Financing Receivable, Past Due [Line Items]
Current	1,643,589
Total performing loans	1,645,697
Commercial real estate: | Commercial owner-occupied real estate | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	6,511
Loans greater than 90 days past due	0
Restructured loans	0
Total non-performing loans	6,511
Commercial real estate: | Commercial owner-occupied real estate | 30-59 days
Financing Receivable, Past Due [Line Items]
Past due		316
Commercial real estate: | Commercial owner-occupied real estate | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	2,108
Commercial real estate: | Commercial owner-occupied real estate | 60-89 days
Financing Receivable, Past Due [Line Items]
Past due		0
Commercial real estate: | Commercial owner-occupied real estate | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	0
Commercial real estate: | Commercial AD&C
Financing Receivable, Past Due [Line Items]
Past due		0
Non-accrual loans		829
Loans greater than 90 days past due		0
Restructured loans		0
Total loans	994,800	684,010
Commercial real estate: | Commercial AD&C | Performing loans:
Financing Receivable, Past Due [Line Items]
Current	991,086
Total performing loans	993,122
Commercial real estate: | Commercial AD&C | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	1,678
Loans greater than 90 days past due	0
Restructured loans	0
Total non-performing loans	1,678
Commercial real estate: | Commercial AD&C | 30-59 days
Financing Receivable, Past Due [Line Items]
Past due		0
Commercial real estate: | Commercial AD&C | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	1,634
Commercial real estate: | Commercial AD&C | 60-89 days
Financing Receivable, Past Due [Line Items]
Past due		0
Commercial real estate: | Commercial AD&C | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	402
Commercial Business
Financing Receivable, Past Due [Line Items]
Non-accrual loans		8,450
Loans greater than 90 days past due		0
Restructured loans		417
Total loans	8,462,956	4,942,862
Commercial Business | Commercial business
Financing Receivable, Past Due [Line Items]
Past due		1,278
Non-accrual loans		8,450
Total loans	2,227,246	801,019
Commercial Business | Commercial business | Performing loans:
Financing Receivable, Past Due [Line Items]
Current	2,198,943
Total performing loans	2,208,425
Commercial Business | Commercial business | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	17,659
Loans greater than 90 days past due	93
Restructured loans	1,069
Total non-performing loans	18,821
Commercial Business | Commercial business | 30-59 days
Financing Receivable, Past Due [Line Items]
Past due		908
Commercial Business | Commercial business | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	8,862
Commercial Business | Commercial business | 60-89 days
Financing Receivable, Past Due [Line Items]
Past due		370
Commercial Business | Commercial business | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	620
Residential real estate: | Residential mortgage
Financing Receivable, Past Due [Line Items]
Past due		19,394
Non-accrual loans		12,661
Loans greater than 90 days past due		0
Restructured loans		1,080
Total loans	1,173,857	1,149,327
Residential real estate: | Residential mortgage | Performing loans:
Financing Receivable, Past Due [Line Items]
Current	1,155,016
Total performing loans	1,161,180
Residential real estate: | Residential mortgage | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	11,296
Loans greater than 90 days past due	320
Restructured loans	1,061
Total non-performing loans	12,677
Residential real estate: | Residential mortgage | 30-59 days
Financing Receivable, Past Due [Line Items]
Past due		14,853
Residential real estate: | Residential mortgage | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	5,197
Residential real estate: | Residential mortgage | 60-89 days
Financing Receivable, Past Due [Line Items]
Past due		4,541
Residential real estate: | Residential mortgage | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	967
Residential real estate: | Residential construction
Financing Receivable, Past Due [Line Items]
Past due		1,614
Non-accrual loans		0
Loans greater than 90 days past due		0
Restructured loans		0
Total loans	175,123	146,279
Residential real estate: | Residential construction | Performing loans:
Financing Receivable, Past Due [Line Items]
Current	169,766
Total performing loans	175,123
Residential real estate: | Residential construction | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	0
Loans greater than 90 days past due	0
Restructured loans	0
Total non-performing loans	0
Residential real estate: | Residential construction | 30-59 days
Financing Receivable, Past Due [Line Items]
Past due		280
Residential real estate: | Residential construction | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	3,167
Residential real estate: | Residential construction | 60-89 days
Financing Receivable, Past Due [Line Items]
Past due		1,334
Residential real estate: | Residential construction | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	2,190
Consumer
Financing Receivable, Past Due [Line Items]
Past due		4,214
Non-accrual loans		4,107
Loans greater than 90 days past due		0
Restructured loans		364
Total loans	521,999	466,764
Consumer | Performing loans:
Financing Receivable, Past Due [Line Items]
Current	507,336
Total performing loans	514,505
Consumer | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	7,493
Loans greater than 90 days past due	1
Restructured loans	0
Total non-performing loans	7,494
Consumer | 30-59 days
Financing Receivable, Past Due [Line Items]
Past due		2,697
Consumer | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	5,039
Consumer | 60-89 days
Financing Receivable, Past Due [Line Items]
Past due		$ 1,517
Consumer | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Past due	$ 2,130

CREDIT QUALITY ASSESSMENT (info

CREDIT QUALITY ASSESSMENT (information about credit quality indicator by year of origination) (Detail) $ in Thousands	Sep. 30, 2020USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 2,703,250
2019	1,878,403
2018	1,279,725
2017	1,127,260
2016	932,405
Prior	1,415,563
Revolving Loans	997,329
Total	10,333,935
Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	680,857
2019	803,725
2018	485,876
2017	508,924
2016	493,956
Prior	583,951
Revolving Loans	31,413
Total	3,588,702
Commercial investor real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	675,314
2019	799,088
2018	466,850
2017	501,591
2016	493,003
Prior	566,433
Revolving Loans	31,413
Total	3,533,692
Commercial investor real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5,049
2019	1,617
2018	19,026
2017	232
2016	271
Prior	1,873
Revolving Loans	0
Total	28,068
Commercial investor real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	494
2019	3,020
2018	0
2017	7,101
2016	682
Prior	15,645
Revolving Loans	0
Total	26,942
Commercial investor real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total	0
Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	210,696
2019	397,591
2018	255,235
2017	209,495
2016	209,577
Prior	367,802
Revolving Loans	1,812
Total	1,652,208
Commercial owner-occupied real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	207,879
2019	392,597
2018	248,942
2017	203,649
2016	209,218
Prior	356,393
Revolving Loans	1,812
Total	1,620,490
Commercial owner-occupied real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,324
2019	4,124
2018	5,505
2017	5,381
2016	137
Prior	5,307
Revolving Loans	0
Total	22,778
Commercial owner-occupied real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	493
2019	870
2018	788
2017	465
2016	222
Prior	5,863
Revolving Loans	0
Total	8,701
Commercial owner-occupied real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	239
Revolving Loans	0
Total	239
Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
2020	359,083
2019	293,857
2018	169,833
2017	76,340
2016	9,554
Prior	2,377
Revolving Loans	83,756
Total	994,800
Commercial AD&C | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	356,246
2019	292,303
2018	169,833
2017	62,582
2016	6,711
Prior	2,377
Revolving Loans	83,756
Total	973,808
Commercial AD&C | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,710
2019	0
2018	0
2017	13,658
2016	0
Prior	0
Revolving Loans	0
Total	15,368
Commercial AD&C | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,127
2019	1,554
2018	0
2017	100
2016	2,843
Prior	0
Revolving Loans	0
Total	5,624
Commercial AD&C | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total	0
Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	174,423
2019	84,846
2018	187,470
2017	225,601
2016	169,331
Prior	332,186
Revolving Loans	0
Total	1,173,857
Residential mortgage | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
2020	169,476
2019	69,350
2018	164,196
2017	207,953
2016	153,302
Prior	285,639
Revolving Loans	0
Total	1,049,916
Residential mortgage | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
2020	4,235
2019	11,924
2018	12,136
2017	13,559
2016	9,753
Prior	24,752
Revolving Loans	0
Total	76,359
Residential mortgage | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
2020	321
2019	1,833
2018	5,089
2017	2,722
2016	3,507
Prior	9,270
Revolving Loans	0
Total	22,742
Residential mortgage | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
2020	391
2019	1,739
2018	6,049
2017	1,367
2016	2,769
Prior	12,525
Revolving Loans	0
Total	24,840
Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
2020	81,390
2019	67,765
2018	19,900
2017	3,963
2016	2,105
Prior	0
Revolving Loans	0
Total	175,123
Residential construction | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
2020	79,897
2019	66,861
2018	19,900
2017	3,963
2016	1,736
Prior	0
Revolving Loans	0
Total	172,357
Residential construction | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
2020	987
2019	904
2018	0
2017	0
2016	369
Prior	0
Revolving Loans	0
Total	2,260
Residential construction | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total	0
Residential construction | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
2020	506
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total	506
Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,192,841
2019	223,573
2018	154,930
2017	99,042
2016	42,770
Prior	94,920
Revolving Loans	419,170
Total	2,227,246
Commercial Business | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,190,428
2019	215,772
2018	149,231
2017	97,275
2016	37,641
Prior	88,653
Revolving Loans	410,116
Total	2,189,116
Commercial Business | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	249
2019	3,517
2018	1,462
2017	18
2016	1,467
Prior	2,210
Revolving Loans	4,365
Total	13,288
Commercial Business | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,050
2019	3,242
2018	3,287
2017	1,713
2016	2,353
Prior	2,070
Revolving Loans	1,708
Total	16,423
Commercial Business | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	114
2019	1,042
2018	950
2017	36
2016	1,309
Prior	1,987
Revolving Loans	2,981
Total	8,419
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,960
2019	7,046
2018	6,481
2017	3,895
2016	5,112
Prior	34,327
Revolving Loans	461,178
Total	521,999
Consumer | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,561
2019	5,345
2018	5,327
2017	2,297
2016	2,772
Prior	23,023
Revolving Loans	420,848
Total	462,173
Consumer | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
2020	608
2019	747
2018	286
2017	452
2016	1,076
Prior	5,090
Revolving Loans	20,555
Total	28,814
Consumer | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
2020	49
2019	433
2018	260
2017	93
2016	503
Prior	3,101
Revolving Loans	8,141
Total	12,580
Consumer | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
2020	742
2019	521
2018	608
2017	1,053
2016	761
Prior	3,113
Revolving Loans	11,634
Total	$ 18,432

CREDIT QUALITY ASSESSMENT (hist

CREDIT QUALITY ASSESSMENT (historical information on the credit quality of the loan portfolio under the legacy disclosure) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		$ 38,632
Loans 90 days past due		0
Restructured loans		2,636
Total non-performing loans		41,268
Other real estate owned	$ 1,389	1,482
Total non-performing assets		42,750
Commercial real estate: | Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		8,437
Loans 90 days past due		0
Restructured loans		775
Total non-performing loans		9,212
Other real estate owned		409
Total non-performing assets		9,621
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		4,148
Loans 90 days past due		0
Restructured loans		0
Total non-performing loans		4,148
Other real estate owned		0
Total non-performing assets		4,148
Commercial real estate: | Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		829
Loans 90 days past due		0
Restructured loans		0
Total non-performing loans		829
Other real estate owned		665
Total non-performing assets		1,494
Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		8,450
Loans 90 days past due		0
Restructured loans		417
Total non-performing loans		8,867
Other real estate owned		39
Total non-performing assets		8,906
Residential real estate: | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		12,661
Loans 90 days past due		0
Restructured loans		1,080
Total non-performing loans		13,741
Other real estate owned		305
Total non-performing assets		14,046
Residential real estate: | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		0
Loans 90 days past due		0
Restructured loans		0
Total non-performing loans		0
Other real estate owned		0
Total non-performing assets		0
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Non-accrual loans		4,107
Loans 90 days past due		0
Restructured loans		364
Total non-performing loans		4,471
Other real estate owned		64
Total non-performing assets		$ 4,535

CREDIT QUALITY ASSESSMENT (Cr_2

CREDIT QUALITY ASSESSMENT (Credit Quality of Loan Portfolio) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total past due		$ 27,748
Non-accrual loans		38,632
Loans acquired with deteriorated credit quality		13,084
Current loans		6,625,768
Total loans	$ 10,333,935	6,705,232
Commercial real estate: | Commercial investor real estate
Financing Receivable, Past Due [Line Items]
Total past due		932
Non-accrual loans		8,437
Loans acquired with deteriorated credit quality		9,544
Current loans		2,150,243
Total loans	3,588,702	2,169,156
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Past Due [Line Items]
Total past due		316
Non-accrual loans		4,148
Loans acquired with deteriorated credit quality		0
Current loans		1,284,213
Total loans	1,652,208	1,288,677
Commercial real estate: | Commercial AD&C
Financing Receivable, Past Due [Line Items]
Total past due		0
Non-accrual loans		829
Loans acquired with deteriorated credit quality		0
Current loans		683,181
Total loans	994,800	684,010
Commercial Business
Financing Receivable, Past Due [Line Items]
Non-accrual loans		8,450
Total loans	8,462,956	4,942,862
Commercial Business | Commercial business
Financing Receivable, Past Due [Line Items]
Total past due		1,278
Non-accrual loans		8,450
Loans acquired with deteriorated credit quality		2,539
Current loans		788,752
Total loans	2,227,246	801,019
Residential real estate: | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total past due		19,394
Non-accrual loans		12,661
Loans acquired with deteriorated credit quality		8
Current loans		1,117,264
Total loans	1,173,857	1,149,327
Residential real estate: | Residential construction
Financing Receivable, Past Due [Line Items]
Total past due		1,614
Non-accrual loans		0
Loans acquired with deteriorated credit quality		0
Current loans		144,665
Total loans	175,123	146,279
Consumer
Financing Receivable, Past Due [Line Items]
Total past due		4,214
Non-accrual loans		4,107
Loans acquired with deteriorated credit quality		993
Current loans		457,450
Total loans	$ 521,999	466,764
30-59 days
Financing Receivable, Past Due [Line Items]
Total past due		19,986
30-59 days | Commercial real estate: | Commercial investor real estate
Financing Receivable, Past Due [Line Items]
Total past due		932
30-59 days | Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Past Due [Line Items]
Total past due		316
30-59 days | Commercial real estate: | Commercial AD&C
Financing Receivable, Past Due [Line Items]
Total past due		0
30-59 days | Commercial Business | Commercial business
Financing Receivable, Past Due [Line Items]
Total past due		908
30-59 days | Residential real estate: | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total past due		14,853
30-59 days | Residential real estate: | Residential construction
Financing Receivable, Past Due [Line Items]
Total past due		280
30-59 days | Consumer
Financing Receivable, Past Due [Line Items]
Total past due		2,697
60-89 days
Financing Receivable, Past Due [Line Items]
Total past due		7,762
60-89 days | Commercial real estate: | Commercial investor real estate
Financing Receivable, Past Due [Line Items]
Total past due		0
60-89 days | Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Past Due [Line Items]
Total past due		0
60-89 days | Commercial real estate: | Commercial AD&C
Financing Receivable, Past Due [Line Items]
Total past due		0
60-89 days | Commercial Business | Commercial business
Financing Receivable, Past Due [Line Items]
Total past due		370
60-89 days | Residential real estate: | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total past due		4,541
60-89 days | Residential real estate: | Residential construction
Financing Receivable, Past Due [Line Items]
Total past due		1,334
60-89 days | Consumer
Financing Receivable, Past Due [Line Items]
Total past due		1,517
> 90 days
Financing Receivable, Past Due [Line Items]
Total past due		0
> 90 days | Commercial real estate: | Commercial investor real estate
Financing Receivable, Past Due [Line Items]
Total past due		0
> 90 days | Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Past Due [Line Items]
Total past due		0
> 90 days | Commercial real estate: | Commercial AD&C
Financing Receivable, Past Due [Line Items]
Total past due		0
> 90 days | Commercial Business | Commercial business
Financing Receivable, Past Due [Line Items]
Total past due		0
> 90 days | Residential real estate: | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total past due		0
> 90 days | Residential real estate: | Residential construction
Financing Receivable, Past Due [Line Items]
Total past due		0
> 90 days | Consumer
Financing Receivable, Past Due [Line Items]
Total past due		$ 0

CREDIT QUALITY ASSESSMENT (Cr_3

CREDIT QUALITY ASSESSMENT (Credit Risk Rating Indicators for Each Segment of Commercial Loan Portfolio) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 10,333,935	$ 6,705,232
Commercial Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		4,942,862
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		4,892,398
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		7,960
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		42,504
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Commercial real estate: | Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,588,702	2,169,156
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,652,208	1,288,677
Commercial real estate: | Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	994,800	684,010
Commercial real estate: | Pass | Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		2,146,971
Commercial real estate: | Pass | Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		1,278,337
Commercial real estate: | Pass | Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		683,181
Commercial real estate: | Special Mention | Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		3,189
Commercial real estate: | Special Mention | Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		2,284
Commercial real estate: | Special Mention | Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Commercial real estate: | Substandard | Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		18,996
Commercial real estate: | Substandard | Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		8,056
Commercial real estate: | Substandard | Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		829
Commercial real estate: | Doubtful | Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Commercial real estate: | Doubtful | Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Commercial real estate: | Doubtful | Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,462,956	4,942,862
Commercial Business | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 2,227,246	801,019
Commercial Business | Pass | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		783,909
Commercial Business | Special Mention | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		2,487
Commercial Business | Substandard | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		14,623
Commercial Business | Doubtful | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		$ 0

CREDIT QUALITY ASSESSMENT (In_2

CREDIT QUALITY ASSESSMENT (Information by Credit Risk Rating Indicators for Those Remaining Segments of Loan Portfolio) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	$ 10,333,935	$ 6,705,232
Residential real estate: | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	1,173,857	1,149,327
Residential real estate: | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	175,123	146,279
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	$ 521,999	466,764
Homogeneous Loan Pools
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		1,762,370
Homogeneous Loan Pools | Residential real estate: | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		1,149,327
Homogeneous Loan Pools | Residential real estate: | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		146,279
Homogeneous Loan Pools | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		466,764
Homogeneous Loan Pools | Performing loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		1,744,158
Homogeneous Loan Pools | Performing loans: | Residential real estate: | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		1,135,586
Homogeneous Loan Pools | Performing loans: | Residential real estate: | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		146,279
Homogeneous Loan Pools | Performing loans: | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		462,293
Homogeneous Loan Pools | Non-performing loans: | 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		0
Homogeneous Loan Pools | Non-performing loans: | Non-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		16,768
Homogeneous Loan Pools | Non-performing loans: | Restructured Loans | Restructured loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		1,444
Homogeneous Loan Pools | Non-performing loans: | Residential real estate: | Residential mortgage | 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		0
Homogeneous Loan Pools | Non-performing loans: | Residential real estate: | Residential mortgage | Non-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		12,661
Homogeneous Loan Pools | Non-performing loans: | Residential real estate: | Residential mortgage | Restructured Loans | Restructured loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		1,080
Homogeneous Loan Pools | Non-performing loans: | Residential real estate: | Residential construction | 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		0
Homogeneous Loan Pools | Non-performing loans: | Residential real estate: | Residential construction | Non-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		0
Homogeneous Loan Pools | Non-performing loans: | Residential real estate: | Residential construction | Restructured Loans | Restructured loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		0
Homogeneous Loan Pools | Non-performing loans: | Consumer | 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		0
Homogeneous Loan Pools | Non-performing loans: | Consumer | Non-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		4,107
Homogeneous Loan Pools | Non-performing loans: | Consumer | Restructured Loans | Restructured loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases		$ 364

CREDIT QUALITY ASSESSMENT (Rest

CREDIT QUALITY ASSESSMENT (Restructured Loans at the date of Restructuring For Specific Segments of the Loan Portfolio) (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 2,783	$ 2,359
Specific allowance	935	401
Restructured and subsequently defaulted	0	0
All Other Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	0	364
Specific allowance	0	0
Restructured and subsequently defaulted	0	0
Troubled debt restructurings:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured accruing	322	1,309
Restructured non-accruing	2,461	1,050
Troubled debt restructurings: | All Other Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured accruing	0	364
Restructured non-accruing	0	0
Commercial real estate: | Commercial investor real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	723	1,564
Specific allowance	49	205
Restructured and subsequently defaulted	0	0
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	930	0
Specific allowance	19	0
Restructured and subsequently defaulted	0	0
Commercial real estate: | Commercial AD&C
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	0	0
Specific allowance	0	0
Restructured and subsequently defaulted	0	0
Commercial real estate: | Troubled debt restructurings: | Commercial investor real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured accruing	0	775
Restructured non-accruing	723	789
Commercial real estate: | Troubled debt restructurings: | Commercial owner-occupied real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured accruing	0	0
Restructured non-accruing	930	0
Commercial real estate: | Troubled debt restructurings: | Commercial AD&C
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured accruing	0	0
Restructured non-accruing	0	0
Commercial Business
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	1,130	431
Specific allowance	867	196
Restructured and subsequently defaulted	0	0
Commercial Business | Troubled debt restructurings:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured accruing	322	170
Restructured non-accruing	$ 808	$ 261

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS - Gross Carrying Amounts and Accumulated Amortization (Details) - USD ($) $ in Thousands	Apr. 01, 2020	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 42,944	$ 12,156
Accumulated Amortization		(8,769)	(4,315)
Net Carrying Amount		34,175	7,841
Goodwill		370,549	347,149
Goodwill		370,549	347,149
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		29,038	10,678
Accumulated Amortization		(6,841)	(3,689)
Net Carrying Amount		$ 22,197	$ 6,989
Weighted Average Remaining Life		8 years 8 months 12 days	8 years
Core deposit intangibles | Revere acquisition
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	9 years 8 months 1 day
Intangible asset acquired	$ 18,400
Other identifiable intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 13,906	$ 1,478
Accumulated Amortization		(1,928)	(626)
Net Carrying Amount		$ 11,978	$ 852
Weighted Average Remaining Life		10 years 10 months 24 days	9 years 8 months 12 days

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS (Net Carrying Amount of Goodwill By Segment) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 347,149
Ending balance	370,549
Acquisition of Rembert Pendleton Jackson
Goodwill [Roll Forward]
Acquisitions	22,559
Acquisition of Revere Bank
Goodwill [Roll Forward]
Acquisitions	841
Community Banking
Goodwill [Roll Forward]
Beginning balance	331,173
Ending balance	332,014
Community Banking | Acquisition of Rembert Pendleton Jackson
Goodwill [Roll Forward]
Acquisitions	0
Community Banking | Acquisition of Revere Bank
Goodwill [Roll Forward]
Acquisitions	841
Insurance
Goodwill [Roll Forward]
Beginning balance	6,788
Ending balance	6,788
Insurance | Acquisition of Rembert Pendleton Jackson
Goodwill [Roll Forward]
Acquisitions	0
Insurance | Acquisition of Revere Bank
Goodwill [Roll Forward]
Acquisitions	0
Investment Management
Goodwill [Roll Forward]
Beginning balance	9,188
Ending balance	31,747
Investment Management | Acquisition of Rembert Pendleton Jackson
Goodwill [Roll Forward]
Acquisitions	22,559
Investment Management | Acquisition of Revere Bank
Goodwill [Roll Forward]
Acquisitions	$ 0

GOODWILL AND OTHER INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS (Estimated Future Amortization Expense for Amortizing Intangibles) (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 1,654
2021	6,600
2022	5,845
2023	5,089
2024	4,333
Thereafter	10,654
Total amortizing intangible assets	$ 34,175

DEPOSITS - Composition of Depos

DEPOSITS - Composition of Deposits (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Deposits [Abstract]
Noninterest-bearing deposits	$ 3,458,804	$ 1,892,052
Interest-bearing deposits:
Demand	1,137,000	836,433
Money market savings	3,104,600	1,839,593
Regular savings	396,280	329,919
Time deposits of less than $100,000	545,903	463,431
Time deposits of $100,000 or more	1,322,382	1,078,891
Total interest-bearing deposits	6,506,165	4,548,267
Total deposits	$ 9,964,969	$ 6,440,319

DEPOSITS - Narrative (Details)

DEPOSITS - Narrative (Details) - USD ($) $ in Millions	Apr. 01, 2020	Sep. 30, 2020
Deposits [Abstract]
Deposits liabilities upon acquisition	$ 2,300
Certificates of deposit	752.4
Fair value premium adjustment	$ 14.7	$ 9.8
Deposit premium amortization period	5 years

BORROWINGS - Narrative (Detail)

BORROWINGS - Narrative (Detail) - USD ($)	Nov. 15, 2024	Oct. 01, 2021	Oct. 05, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Nov. 05, 2019
Debt Instrument [Line Items]
Subordinated debt				$ 230,300,000			$ 230,300,000		$ 209,406,000
Repayments of subordinated debt							10,310,000	$ 0
Long-term debt				1,137,216,000			1,137,216,000		936,788,000
FHLB advances				444,200,000			444,200,000		513,800,000
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Maximum borrowing capacity				2,300,000,000			2,300,000,000		2,400,000,000
Line of credit				444,200,000			444,200,000		513,800,000
Loans pledged as collateral									1,000,000,000
Federal Home Loan Bank Advances | Residential mortgage
Debt Instrument [Line Items]
Loans pledged as collateral				1,000,000,000			1,000,000,000
Federal Home Loan Bank Advances | Commercial real estate loans
Debt Instrument [Line Items]
Loans pledged as collateral				2,700,000,000			2,700,000,000		1,900,000,000
Federal Home Loan Bank Advances | Home equity lines of credit
Debt Instrument [Line Items]
Loans pledged as collateral				227,000,000			227,000,000		266,800,000
Federal Home Loan Bank Advances | Multifamily loans
Debt Instrument [Line Items]
Loans pledged as collateral				235,700,000			235,700,000		109,700,000
Federal Reserve and correspondent banks
Debt Instrument [Line Items]
Maximum borrowing capacity				366,500,000			366,500,000		463,300,000
Unsecured lines of credit, correspondent banks
Debt Instrument [Line Items]
Maximum borrowing capacity				780,000,000			780,000,000		730,000,000
Revere acquisition
Debt Instrument [Line Items]
FHLB advances				168,400,000			168,400,000
Fair value of debt premium				5,800,000			5,800,000
Extinguishment of debt					$ 115,400,000
Debt prepayment cost					5,900,000
Remaining unamortized fair value premium					5,800,000
FHLB advances acquisition date fully matured during the period					$ 53,000,000
Subordinated Debt
Debt Instrument [Line Items]
Subordinated debt				$ 230,300,000			$ 230,300,000		199,009,000
Interest rate				4.25%			4.25%
Purchase accounting premium				$ 1,954,000			$ 1,954,000		1,894,000
Subordinated Debt | Fixed Floating Rate Subordinated Notes
Debt Instrument [Line Items]
Subordinated debt										$ 175,000,000
Interest rate										4.25%
Unamortized discount (premium) and debt issuance costs, net				2,900,000			2,900,000
Subordinated Debt | London Interbank Offered Rate (LIBOR) | Subsequent Event | Forecast | Fixed Floating Rate Subordinated Notes
Debt Instrument [Line Items]
Basis spread on variable rate	2.62%
Subordinated Debt | WashingtonFirst Bankshares Inc
Debt Instrument [Line Items]
Subordinated debt				$ 25,000,000			$ 25,000,000
Interest rate				6.00%			6.00%
Purchase accounting premium				$ 2,200,000			$ 2,200,000
Subordinated Debt | WashingtonFirst Bankshares Inc | London Interbank Offered Rate (LIBOR) | Subsequent Event | Forecast
Debt Instrument [Line Items]
Basis spread on variable rate			4.67%
Subordinated Debt | Revere acquisition
Debt Instrument [Line Items]
Subordinated debt				$ 31,000,000			$ 31,000,000
Interest rate				5.625%			5.625%
Purchase accounting premium				$ 200,000			$ 200,000
Subordinated Debt | Revere acquisition | Subsequent Event | Forecast
Debt Instrument [Line Items]
Basis spread on variable rate		4.41%
Retail Repurchase Agreements
Debt Instrument [Line Items]
Long-term debt				142,300,000			142,300,000		138,600,000
Federal Funds Purchased
Debt Instrument [Line Items]
Long-term debt				70,000,000			70,000,000		75,000,000
Federal funds under the PPPLF program
Debt Instrument [Line Items]
Long-term debt				250,400,000			250,400,000
Remaining borrowing capacity				837,700,000			837,700,000
Borrowings repaid				594,600,000
Junior Subordinated Debt
Debt Instrument [Line Items]
Subordinated debt				0			0		10,397,000
Purchase accounting premium				0			0		$ 87,000
Junior Subordinated Debt | WashingtonFirst Bankshares Inc
Debt Instrument [Line Items]
Subordinated debt				10,300,000			10,300,000
Purchase accounting premium				$ 100,000			$ 100,000
Repayments of subordinated debt						$ 10,300,000

BORROWINGS - Schedule of Subord

BORROWINGS - Schedule of Subordinated Borrowing (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Subordinated Borrowing [Line Items]
Subordinated debt	$ 230,300	$ 209,406
Subordinated Debt
Subordinated Borrowing [Line Items]
Subordinated debt, gross	231,000	200,000
Subordinated debt	230,300	199,009
Purchase accounting premium	1,954	1,894
Debt Issuance Costs, Gross	$ (2,654)	(2,885)
Interest rate	4.25%
Subordinated Debt | Fixed Floating
Subordinated Borrowing [Line Items]
Subordinated debt, gross	$ 175,000	175,000
Subordinated Debt | WashingtonFirst Bankshares Inc
Subordinated Borrowing [Line Items]
Subordinated debt, gross	25,000	25,000
Subordinated debt	25,000
Purchase accounting premium	$ 2,200
Interest rate	6.00%
Subordinated Debt | Revere acquisition
Subordinated Borrowing [Line Items]
Subordinated debt, gross	$ 31,000	0
Subordinated debt	31,000
Purchase accounting premium	$ 200
Interest rate	5.625%
Junior Subordinated Debt
Subordinated Borrowing [Line Items]
Subordinated debt, gross	$ 0	10,310
Subordinated debt	0	10,397
Purchase accounting premium	0	$ 87
Junior Subordinated Debt | WashingtonFirst Bankshares Inc
Subordinated Borrowing [Line Items]
Subordinated debt	10,300
Purchase accounting premium	$ 100

STOCKHOLDERS' EQUITY - Narrativ

STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Apr. 01, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2020
Equity [Line Items]
Number of shares authorized to be repurchased (in shares)		1,800,000	1,800,000	1,800,000
Stock repurchased (in shares)		0
Common stock repurchased, average price (in dollars per share)			$ 31.33
Stock repurchased and retired (in shares)			820,328	1,488,519
Stock repurchased and retired			$ 25,702	$ 50,000
Stock issued during period (in shares)	12,768,949		12,768,949
Revere acquisition
Equity [Line Items]
Stock issued during period (in shares)	12,768,949
Common stock price (in dollars per share)	$ 22.64

SHARE BASED COMPENSATION - Narr

SHARE BASED COMPENSATION - Narrative (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	May 06, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued (in shares)			395,298
Revere acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued (in shares)			395,298
Weighted average grant date fair value (in dollars per share)			$ 9.14
2015 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)					1,500,000
Shares available for issuance (in shares)	908,499		908,499
Expiration period			10 years
Award vesting rights, percentage			100.00%
2015 Omnibus Incentive Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period			7 years
2015 Omnibus Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period			10 years
2015 Omnibus Incentive Plan | Stock Options and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	$ 1	$ 0.7	$ 2.8	$ 2.1
2015 Omnibus Incentive Plan | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested			$ 0.1	$ 0.2
Granted (in shares)	0		0
2015 Omnibus Incentive Plan | Restricted shares, Restricted stock units and Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 9.1		$ 9.1
Expected cost recognition weighted average period			2 years 9 months 18 days
Shares issued (in shares)			246,015
2015 Omnibus Incentive Plan | Performance Shares | 3 Year Vesting Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)			44,905
2015 Omnibus Incentive Plan | Time Based Shares | 3 or 5 Year Vesting Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)			201,110

SHARE BASED COMPENSATION - Summ

SHARE BASED COMPENSATION - Summary of Share Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Number of Common Shares
Beginning balance (in shares)			65,279
Granted (in shares)			0
Converted options from Revere acquisition (in shares)			395,298
Exercised (in shares)	(1,575)	(1,325)	(10,213)	(12,222)
Forfeited (in shares)			(765)
Expired (in shares)			(703)
Ending balance (in shares)	448,896		448,896
Exercisable at end of period (in shares)	444,132		444,132
Weighted Average Exercise Share Price
Beginning balance (in dollars per share)			$ 31.34
Granted (in dollars per share)			0
Converted options from Revere acquisition (in dollars per share)			12.27
Exercised (in dollars per share)			16.07
Forfeited (in dollars per share)			39.02
Expired (in dollars per share)			28.26
Ending balance (in dollars per share)	$ 14.89		14.89
Exercisable at end of period (in dollars per share)	$ 14.64		$ 14.64
Weighted Average Contractual Remaining Life (Years)
Balance at end of period			3 years 1 month 6 days
Exercisable at end of period			3 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]
Beginning balance			$ 485
Exercised			123
Ending balance	$ 4,383		4,383
Exercisable at end of period	$ 4,383		$ 4,383

SHARE BASED COMPENSATION - Su_2

SHARE BASED COMPENSATION - Summary of Activity Restricted Stock (Detail) - Restricted Stock	9 Months Ended
	Sep. 30, 2020$ / sharesshares
Number of Common Shares/Units
Nonvested beginning balance (in shares) | shares	226,502
Granted (in shares) | shares	246,015
Vested (in shares) | shares	(66,533)
Forfeited (in shares) | shares	(9,363)
Nonvested ending balance (in shares) | shares	396,621
Weighted Average Grant-Date Fair Value
Nonvested beginning balance (in dollars per share) | $ / shares	$ 35.43
Granted (in dollars per share) | $ / shares	25.82
Vested (in dollars per share) | $ / shares	34.38
Forfeited (in dollars per share) | $ / shares	43.71
Nonvested ending balance (in dollars per share) | $ / shares	$ 29.45

PENSION PLAN (Net Periodic Bene

PENSION PLAN (Net Periodic Benefit Cost) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Interest cost on projected benefit obligation	$ 359	$ 403	$ 1,078	$ 1,207
Expected return on plan assets	(456)	(412)	(1,368)	(1,236)
Recognized net actuarial loss	219	264	656	794
Net periodic benefit cost	$ 122	$ 255	$ 366	$ 765

NET INCOME_ (LOSS) PER COMMON_2

NET INCOME/ (LOSS) PER COMMON SHARE (Calculation of Net Income per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 44,642	$ 29,383	$ 40,291	$ 87,976
Distributed and undistributed earnings allocated to participating securities	373	186	317	570
Net income attributable to common shareholders	$ 44,269	$ 29,197	$ 39,974	$ 87,406
Total weighted average outstanding shares (in shares)	47,415,000	35,850,000	43,261,000	35,829,000
Less: weighted average participating securities (in shares)	397,000	228,000	355,000	237,000
Basic weighted average common shares (in shares)	47,018,000	35,622,000	42,906,000	35,592,000
Dilutive weighted average common stock equivalents (in shares)	157,000	50,000	165,000	50,000
Diluted weighted average common shares (in shares)	47,175,000	35,672,000	43,071,000	35,642,000
Basic net income per common share (in dollars per share)	$ 0.94	$ 0.82	$ 0.93	$ 2.46
Diluted net income per common share (in dollars per share)	$ 0.94	$ 0.82	$ 0.93	$ 2.45
Anti-dilutive shares (in shares)	37,000	8,000	22,000	10,000

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Net Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (4,332)
Other comprehensive income before reclassification, net of tax			21,650	$ 12,475
Reclassifications from accumulated other comprehensive income, net of tax			175	571
Total other comprehensive income	$ 2,669	$ 857	21,825	13,046
Ending Balance	17,493		17,493
Unrealized Gains on Investments Available-for-Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			4,000	(6,630)
Other comprehensive income before reclassification, net of tax			21,650	12,475
Reclassifications from accumulated other comprehensive income, net of tax			(322)	(15)
Total other comprehensive income			21,328	12,460
Ending Balance	25,328	5,830	25,328	5,830
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(8,332)	(9,124)
Other comprehensive income before reclassification, net of tax			0	0
Reclassifications from accumulated other comprehensive income, net of tax			497	586
Total other comprehensive income			497	586
Ending Balance	(7,835)	(8,538)	(7,835)	(8,538)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(4,332)	(15,754)
Total other comprehensive income	2,669	857	21,825	13,046
Ending Balance	$ 17,493	$ (2,708)	$ 17,493	$ (2,708)

ACCUMULATED OTHER COMPREHENSI_4

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification Adjustments Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Unrealized gains/(losses) on investments available-for-sale Affected line item in the Statements of Income:
Investment securities gains			$ 432	$ 20
Income before taxes	$ 51	$ 15	432	20
Tax expense	$ (13)	$ (4)	(110)	(5)
Net income			322	15
Amortization of defined benefit pension plan items Affected line item in the Statements of Income:
Recognized actuarial loss			(656)	(794)
Loss before taxes			(656)	(794)
Tax benefit			159	208
Net loss			$ (497)	$ (586)

LEASES - Narrative (Details)

LEASES - Narrative (Details) $ in Thousands	Apr. 01, 2020USD ($)locationoperating-lease	Sep. 30, 2020USD ($)	Mar. 31, 2020USD ($)location	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Right-of-use asset obtained in exchange for operating lease liability		$ 0		$ 0	$ 0	$ 0
Lease Liability		77,506			77,506		$ 76,871
Operating lease ROU assets		$ 67,554			$ 67,554		$ 69,320
Minimum
Lessee, Lease, Description [Line Items]
Renewal term		1 year			1 year
Maximum
Lessee, Lease, Description [Line Items]
Renewal term		20 years			20 years
Revere acquisition
Lessee, Lease, Description [Line Items]
Right-of-use asset obtained in exchange for operating lease liability	$ 7,400	$ 0		$ 0	$ 7,720	$ 0
Number of operating leases | operating-lease	15
Number of locations operating leases | location	12
Lease Liability	$ 8,700
Acquisition related unfavorable fair value marks	1,100
Tenant allowance	200
Expense related to lease termination	$ 2,300
Acquisition of Rembert Pendleton Jackson
Lessee, Lease, Description [Line Items]
Number of locations acquired | location			2
Right-of-use asset obtained in exchange for operating lease liability			$ 300
Lease operation commence in 2021
Lessee, Lease, Description [Line Items]
Lease Liability		2,100			2,100
Acquisition related unfavorable fair value marks		500			500
Tenant allowance		200			200
Operating lease ROU assets		$ 1,400			$ 1,400

LEASES - Lease Cost (Details)

LEASES - Lease Cost (Details) - USD ($) $ in Thousands	Apr. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Components of lease expense:
Operating lease cost (resulting from lease payments)		$ 3,154	$ 2,912	$ 9,281	$ 8,605
Acquisitions		$ 0	0	$ 0	0
Weighted average remaining lease term of operating leases		9 years 7 months 6 days		9 years 7 months 6 days		10 years 4 months 24 days
Weighted average discount rate of operating leases		3.10%		3.10%		3.28%
Supplemental cash flow information related to leases:
Operating cash flows from operating leases		$ 4,158	2,349	$ 10,160	6,653
Operating lease ROU assets		67,554		67,554		$ 69,320
Lease Liability		77,506		77,506		$ 76,871
Revere acquisition
Components of lease expense:
Acquisitions	$ 7,400	$ 0	$ 0	$ 7,720	$ 0
Supplemental cash flow information related to leases:
Lease Liability	$ 8,700

LEASES - Maturities of operatin

LEASES - Maturities of operating lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remaining for 2020	$ 3,280
2021	12,634
2022	11,029
2023	10,882
2024	9,064
Thereafter	44,407
Total undiscounted lease payments	91,296
Less: Present value discount	(13,790)
Lease Liability	$ 77,506	$ 76,871

DERIVATIVES - Narrative (Detail

DERIVATIVES - Narrative (Detail) - Commercial Loan - Not Designated as Hedging Instrument - Interest rate swap agreements - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional amount	$ 240.1	$ 204.7
Estimated fair value	$ 10.2	$ 2.5

FAIR VALUE (Financial Assets an

FAIR VALUE (Financial Assets and Liabilities at Dates Indicated that Were Accounted for or Disclosed at Fair Value) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	$ 1,357,205	$ 1,073,333
Residential mortgage loans held for sale (at fair value)	88,728	53,701
Residential Mortgage Loans Held For Sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Residential mortgage loans held for sale (at fair value)	85,800	52,600
U.S. treasuries and government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	139,405	258,495
State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	352,987	233,649
Mortgage-backed and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	852,314	570,759
Corporate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	12,499	9,552
Trust preferred
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	310
Debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	1,357,205	1,072,765
Marketable equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	568
Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	1,357,205	1,073,333
Total assets	1,456,156	1,129,541
Total liabilities	(10,223)	(2,507)
Fair Value, Recurring | Residential Mortgage Loans Held For Sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Residential mortgage loans held for sale	88,728	53,701
Fair Value, Recurring | U.S. treasuries and government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	139,405	258,495
Fair Value, Recurring | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	352,987	233,649
Fair Value, Recurring | Mortgage-backed and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	852,314	570,759
Fair Value, Recurring | Corporate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	12,499	9,552
Fair Value, Recurring | Trust preferred
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		310
Fair Value, Recurring | Debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		1,072,765
Fair Value, Recurring | Marketable equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		568
Fair Value, Recurring | Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements	10,223	2,507
Interest rate swap agreements	(10,223)	(2,507)
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	0
Total assets	0	0
Total liabilities	0	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential Mortgage Loans Held For Sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Residential mortgage loans held for sale	0	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries and government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Trust preferred
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements	0	0
Interest rate swap agreements	0	0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	1,344,706	1,063,471
Total assets	1,443,657	1,119,679
Total liabilities	(10,223)	(2,507)
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Residential Mortgage Loans Held For Sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Residential mortgage loans held for sale	88,728	53,701
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | U.S. treasuries and government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	139,405	258,495
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	352,987	233,649
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-backed and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	852,314	570,759
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Trust preferred
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		1,062,903
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Marketable equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		568
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements	10,223	2,507
Interest rate swap agreements	(10,223)	(2,507)
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	12,499	9,862
Total assets	12,499	9,862
Total liabilities	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Residential Mortgage Loans Held For Sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Residential mortgage loans held for sale	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | U.S. treasuries and government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Mortgage-backed and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)	12,499	9,552
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Trust preferred
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		310
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		9,862
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Marketable equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale (at fair value)		0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements	0	0
Interest rate swap agreements	$ 0	$ 0

FAIR VALUE (Change in the fair

FAIR VALUE (Change in the fair value of assets measured in the Condensed Consolidated Statements) (Detail) - Fair Value, Inputs, Level 3 - Investments available-for-sale: $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 9,862
Additions of Level 3 assets	3,050
Sales of Level 3 assets	(349)
Total unrealized loss included in other comprehensive income/ (loss)	(64)
Ending balance	$ 12,499

FAIR VALUE (Assets Measured at

FAIR VALUE (Assets Measured at Fair Value on Nonrecurring Basis) (Detail) - Fair Value, Nonrecurring - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	$ 15,996	$ 8,368
Total Losses	(11,608)	(6,580)
Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	14,325	6,886
Total Losses	(11,326)	(6,299)
Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	1,671	1,482
Total Losses	(282)	(281)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	0	0
Significant Other Observable Inputs (Level 2) | Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	0	0
Significant Other Observable Inputs (Level 2) | Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	0	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	15,996	8,368
Fair Value, Inputs, Level 3 | Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	14,325	6,886
Fair Value, Inputs, Level 3 | Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	$ 1,671	$ 1,482

FAIR VALUE - Narrative (Details

FAIR VALUE - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Balance of loans individually evaluated for credit loss	$ 56,122	$ 24,773
Loans receivable, fair value	47,800	19,300
Allowance related to loans evaluated individually	$ 8,263	5,501
Total impaired loans:		$ 24,773

FAIR VALUE (Carrying Amounts an

FAIR VALUE (Carrying Amounts and Fair Values of Company's Financial Instruments) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial assets:
Residential mortgage loans held for sale (at fair value)	$ 88,728	$ 53,701
Investments available-for-sale (at fair value)	1,357,205	1,073,333
Loans, net of allowance	10,163,621	6,649,100
Accrued interest receivable	48,176	23,282
Financial liabilities:
Other deposits	9,964,969	6,440,319
Securities sold under retail repurchase agreements and federal funds purchased	462,706	213,605
Advances from FHLB	444,210	513,777
Subordinated debt	230,300	209,406
Carrying Amount
Financial assets:
Cash and cash equivalents	224,883	146,103
Residential mortgage loans held for sale (at fair value)	88,728	53,701
Investments available-for-sale (at fair value)	1,357,205	1,073,333
Equity securities	68,528	51,803
Loans, net of allowance	10,163,621	6,649,100
Interest rate swap agreements	10,223	2,507
Accrued interest receivable	48,176	23,282
Bank owned life insurance	126,182	113,171
Financial liabilities:
Time Deposits	1,868,285	1,542,322
Other deposits	8,096,684	4,897,997
Securities sold under retail repurchase agreements and federal funds purchased	462,706	213,605
Advances from FHLB	444,210	513,777
Subordinated debt	230,300	209,406
Interest rate swap agreements	10,223	2,507
Accrued interest payable	6,822	4,194
Estimated Fair Value
Financial assets:
Cash and cash equivalents	224,883	146,103
Residential mortgage loans held for sale (at fair value)	88,728	53,701
Investments available-for-sale (at fair value)	1,357,205	1,073,333
Equity securities	68,528	51,803
Loans, net of allowance	10,332,039	6,628,054
Interest rate swap agreements	10,223	2,507
Accrued interest receivable	48,176	23,282
Bank owned life insurance	126,182	113,171
Financial liabilities:
Time Deposits	1,889,807	1,547,116
Other deposits	8,096,684	4,897,997
Securities sold under retail repurchase agreements and federal funds purchased	462,889	213,605
Advances from FHLB	457,875	520,729
Subordinated debt	234,808	200,864
Interest rate swap agreements	10,223	2,507
Accrued interest payable	6,822	4,194
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	224,883	146,103
Residential mortgage loans held for sale (at fair value)	0	0
Investments available-for-sale (at fair value)	0	0
Equity securities	68,528	51,803
Loans, net of allowance	0	0
Interest rate swap agreements	0	0
Accrued interest receivable	48,176	23,282
Bank owned life insurance	0	0
Financial liabilities:
Time Deposits	0	0
Other deposits	8,096,684	4,897,997
Securities sold under retail repurchase agreements and federal funds purchased	0	0
Advances from FHLB	0	0
Subordinated debt	0	0
Interest rate swap agreements	0	0
Accrued interest payable	6,822	4,194
Significant Other Observable Inputs (Level 2) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0	0
Residential mortgage loans held for sale (at fair value)	88,728	53,701
Investments available-for-sale (at fair value)	1,344,706	1,063,471
Equity securities	0	0
Loans, net of allowance	0	0
Interest rate swap agreements	10,223	2,507
Accrued interest receivable	0	0
Bank owned life insurance	126,182	113,171
Financial liabilities:
Time Deposits	1,889,807	1,547,116
Other deposits	0	0
Securities sold under retail repurchase agreements and federal funds purchased	462,889	213,605
Advances from FHLB	457,875	520,729
Subordinated debt	0	0
Interest rate swap agreements	10,223	2,507
Accrued interest payable	0	0
Significant Unobservable Inputs (Level 3) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0	0
Residential mortgage loans held for sale (at fair value)	0	0
Investments available-for-sale (at fair value)	12,499	9,862
Equity securities	0	0
Loans, net of allowance	10,332,039	6,628,054
Interest rate swap agreements	0	0
Accrued interest receivable	0	0
Bank owned life insurance	0	0
Financial liabilities:
Time Deposits	0	0
Other deposits	0	0
Securities sold under retail repurchase agreements and federal funds purchased	0	0
Advances from FHLB	0	0
Subordinated debt	234,808	200,864
Interest rate swap agreements	0	0
Accrued interest payable	$ 0	$ 0

SEGMENT REPORTING - Narrative (

SEGMENT REPORTING - Narrative (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)segment	Sep. 30, 2019USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			3
Amortization of Intangible Assets	$ 1,968	$ 491	$ 4,566	$ 1,465
Community Banking
Segment Reporting Information [Line Items]
Amortization of Intangible Assets	1,400	$ 400	3,200	$ 1,300
Investment Management
Segment Reporting Information [Line Items]
Amortization of Intangible Assets	500		1,400
Investment Management | West Financial and RPJ
Segment Reporting Information [Line Items]
Assets under management	$ 3,100,000		$ 3,100,000

SEGMENT REPORTING (Operating Se

SEGMENT REPORTING (Operating Segments and Reconciliation of Information to Condensed Consolidated Financial Statements) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Interest income	$ 112,984	$ 87,082	$ 311,769	$ 262,479
Interest expense	15,500	20,292	48,437	62,754
Provision for credit losses	7,003	1,524	90,158	3,029	$ 4,684
Non-interest income	29,390	18,573	70,482	52,098
Non-interest expense	60,937	44,925	194,121	133,004
Income before income taxes	58,934	38,914	49,535	115,790
Income tax expense	14,292	9,531	9,244	27,814
Net income	44,642	29,383	40,291	87,976
Assets	12,678,131	8,437,538	12,678,131	8,437,538	$ 8,629,002
Inter-Segment Elimination
Segment Reporting Information [Line Items]
Interest income	(3)	(3)	(10)	(10)
Interest expense	(3)	(3)	(10)	(10)
Provision for credit losses	0	0	0	0
Non-interest income	(221)	(168)	(645)	(501)
Non-interest expense	(221)	(168)	(645)	(501)
Income before income taxes	0	0	0	0
Income tax expense	0	0	0	0
Net income	0	0	0	0
Assets	(68,642)	(33,698)	(68,642)	(33,698)
Community Banking | Operating Segments
Segment Reporting Information [Line Items]
Interest income	112,985	87,068	311,771	262,465
Interest expense	15,503	20,295	48,447	62,764
Provision for credit losses	7,003	1,524	90,158	3,029
Non-interest income	24,746	14,080	57,976	39,643
Non-interest expense	57,856	41,806	184,921	123,876
Income before income taxes	57,369	37,523	46,221	112,439
Income tax expense	13,912	9,162	8,396	26,924
Net income	43,457	28,361	37,825	85,515
Assets	12,678,396	8,437,588	12,678,396	8,437,588
Insurance | Operating Segments
Segment Reporting Information [Line Items]
Interest income	1	13	5	15
Interest expense	0	0	0	0
Provision for credit losses	0	0	0	0
Non-interest income	2,119	2,123	5,446	5,296
Non-interest expense	1,580	1,635	4,319	4,359
Income before income taxes	540	501	1,132	952
Income tax expense	149	138	313	265
Net income	391	363	819	687
Assets	11,289	11,615	11,289	11,615
Investment Management | Operating Segments
Segment Reporting Information [Line Items]
Interest income	1	4	3	9
Interest expense	0	0	0	0
Provision for credit losses	0	0	0	0
Non-interest income	2,746	2,538	7,705	7,660
Non-interest expense	1,722	1,652	5,526	5,270
Income before income taxes	1,025	890	2,182	2,399
Income tax expense	231	231	535	625
Net income	794	659	1,647	1,774
Assets	$ 57,088	$ 22,033	$ 57,088	$ 22,033