Sandy Spring Bancorp (SASR) 10-Q 5 Nov 21 2021 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2021	Nov. 03, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
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)		45,619,373
Amendment Flag	false
Document Fiscal Year Focus	2021
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, 2021	Dec. 31, 2020
Assets:
Cash and due from banks	$ 105,937	$ 93,651
Federal funds sold	352	291
Interest-bearing deposits with banks	1,008,344	203,061
Cash and cash equivalents	1,114,633	297,003
Residential mortgage loans held for sale (at fair value)	44,678	78,294
Investments available-for-sale	1,429,555	1,348,021
Equity securities	41,097	65,760
Total loans	9,721,348	10,400,509
Less: allowance for credit losses	(107,920)	(165,367)
Net loans	9,613,428	10,235,142
Premises and equipment, net	58,362	57,720
Other real estate owned	1,105	1,455
Accrued interest receivable	36,219	46,431
Goodwill	370,223	370,223
Other intangible assets, net	27,531	32,521
Other assets	280,633	265,859
Total assets	13,017,464	12,798,429
Liabilities:
Noninterest-bearing deposits	3,987,411	3,325,547
Interest-bearing deposits	6,999,989	6,707,522
Total deposits	10,987,400	10,033,069
Securities sold under retail repurchase agreements and federal funds purchased	147,504	543,157
Advances from FHLB	0	379,075
Subordinated debt	172,639	227,088
Total borrowings	320,143	1,149,320
Accrued interest payable and other liabilities	163,861	146,085
Total liabilities	11,471,404	11,328,474
Stockholders' equity:
Common stock	46,119	47,057
Additional paid in capital	799,766	846,922
Retained earnings	701,301	557,271
Accumulated other comprehensive income/ (loss)	(1,126)	18,705
Total stockholders' equity	1,546,060	1,469,955
Total liabilities and stockholders' equity	$ 13,017,464	$ 12,798,429

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF CONDITION - UNAUDITED - (Parenthetical) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
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)	46,119,074	47,056,777
Common stock, shares outstanding (in shares)	46,119,074	47,056,777

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income:
Interest and fees on loans	$ 104,384	$ 106,560	$ 319,563	$ 288,721
Interest on loans held for sale	379	398	1,465	1,094
Interest on deposits with banks	302	84	395	419
Interest and dividends on investment securities:
Taxable	3,958	4,488	12,230	17,270
Tax-advantaged	2,106	1,454	6,560	4,264
Interest on federal funds sold	0	0	0	1
Total interest income	111,129	112,984	340,213	311,769
Interest expense:
Interest on deposits	3,521	9,439	12,202	35,241
Interest on retail repurchase agreements and federal funds purchased	43	551	139	1,731
Interest on advances from FHLB	0	2,841	2,649	3,863
Interest on subordinated debt	961	2,669	5,973	7,602
Total interest expense	4,525	15,500	20,963	48,437
Net interest income	106,604	97,484	319,250	263,332
Provision/ (credit) for credit losses	(8,229)	7,003	(47,141)	90,158
Net interest income after provision/ (credit) for credit losses	114,833	90,481	366,391	173,174
Non-interest income:
Investment securities gains	49	51	178	432
Insurance agency commissions	2,285	2,122	5,685	5,439
Income from bank owned life insurance	818	708	2,203	2,162
Other income	3,025	1,418	12,309	5,276
Total non-interest income	24,394	29,390	79,519	70,482
Non-interest expense:
Salaries and employee benefits	38,653	36,041	114,295	98,391
Occupancy expense of premises	5,728	5,575	16,712	16,147
Equipment expense	3,214	3,133	9,456	9,103
Marketing	1,376	1,305	3,640	3,223
Outside data services	2,317	2,614	6,860	6,365
FDIC insurance	361	1,340	3,303	3,200
Amortization of intangible assets	1,635	1,968	4,991	4,566
Merger and acquisition expense	0	1,263	45	25,171
Professional fees and services	3,031	1,800	7,927	5,466
Other expenses	6,866	5,898	27,100	22,489
Total non-interest expense	63,181	60,937	194,329	194,121
Income before income tax expense	76,046	58,934	251,581	49,535
Income tax expense	19,070	14,292	61,878	9,244
Net income	$ 56,976	$ 44,642	$ 189,703	$ 40,291
Per share information:
Basic net income/ (loss) per common share (in dollars per share)	$ 1.21	$ 0.94	$ 4	$ 0.93
Diluted net income/ (loss) per share (in dollars per share)	1.20	0.94	3.98	0.93
Dividends declared per share (in dollars per share)	$ 0.32	$ 0.30	$ 0.96	$ 0.90
Service charges on deposit accounts
Non-interest income:
Fees and commissions, mortgage banking and servicing	$ 2,108	$ 1,673	$ 5,936	$ 5,149
Mortgage banking activities
Non-interest income:
Fees and commissions, mortgage banking and servicing	4,942	14,108	20,887	25,567
Wealth management income
Non-interest income:
Fees and commissions, mortgage banking and servicing	9,392	7,785	27,243	22,355
Bank card fees
Non-interest income:
Fees and commissions, mortgage banking and servicing	$ 1,775	$ 1,525	$ 5,078	$ 4,102

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 56,976	$ 44,642	$ 189,703	$ 40,291
Investments available-for-sale:
Net change in unrealized gains/ (losses) on investments available-for-sale	(8,183)	3,445	(27,149)	29,074
Related income tax expense/ (benefit)	2,073	(909)	6,931	(7,424)
Net investment gains reclassified into earnings	(49)	(51)	(178)	(432)
Related income tax expense	12	13	45	110
Net effect on other comprehensive income/ (loss)	(6,147)	2,498	(20,351)	21,328
Defined benefit pension plan:
Net change of unrealized loss	228	219	682	656
Related income tax benefit	(41)	(48)	(162)	(159)
Net effect on other comprehensive income/ (loss)	187	171	520	497
Total other comprehensive income/ (loss)	(5,960)	2,669	(19,831)	21,825
Comprehensive income	$ 51,016	$ 47,311	$ 169,872	$ 62,116

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, 2019	$ 1,132,974	$ (2,221)	$ 34,970	$ 586,622	$ 515,714	$ (2,221)	$ (4,332)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40,291				40,291
Other comprehensive loss, net of tax	21,825						21,825
Total other comprehensive income	62,116
Common stock dividends	(38,953)				(38,953)
Stock compensation expense	2,824			2,824
Revere Bank acquisition	289,089		12,769	276,320
Conversion of Revere stock options	3,611			3,611
Stock option plan	165		11	154
Employee stock purchase plan	1,309		50	1,259
Restricted stock, net	(463)		46	(509)
Common stock repurchase	(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	$ 2	47,001	843,876	484,392	$ 2	14,824
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	44,642				44,642
Other comprehensive loss, net of tax	2,669						2,669
Total other 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)
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 Dec. 31, 2020	1,469,955		47,057	846,922	557,271		18,705
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	189,703				189,703
Other comprehensive loss, net of tax	(19,831)						(19,831)
Total other comprehensive income	169,872
Common stock dividends	(45,673)				(45,673)
Stock compensation expense	3,640			3,640
Stock option plan	2,583		193	2,390
Employee stock purchase plan	1,581		49	1,532
Restricted stock, net	(1,577)		82	(1,659)
Common stock repurchase	(54,321)		(1,262)	(53,059)
Balance at end of period at Sep. 30, 2021	1,546,060		46,119	799,766	701,301		(1,126)
Balance at beginning of period at Jun. 30, 2021	1,562,280		47,313	850,555	659,578		4,834
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56,976				56,976
Other comprehensive loss, net of tax	(5,960)						(5,960)
Total other comprehensive income	51,016
Common stock dividends	(15,253)				(15,253)
Stock compensation expense	1,331			1,331
Stock option plan	567		53	514
Employee stock purchase plan	479		11	468
Restricted stock, net	(39)		4	(43)
Common stock repurchase	(54,321)		(1,262)	(53,059)
Balance at end of period at Sep. 30, 2021	$ 1,546,060		$ 46,119	$ 799,766	$ 701,301		$ (1,126)

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - UNAUDITED - (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Common stock dividends (in dollars per share)	$ 0.32	$ 0.30	$ 0.96	$ 0.90
Stock issued during period (in shares)				12,768,949
Converted options from Revere acquisition (in shares)				395,298
Stock option plan (in shares)	53,079	1,575	193,602	10,213
Employee stock purchase plan (in shares)	11,010	21,374	48,685	50,189
Restricted stock (in shares)	3,831	1,808	81,838	46,386
Stock repurchased and retired (in shares)	(1,261,828)		(1,261,828)	(820,328)

CONDENSED CONSOLIDATED STATEM_7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS UNAUDITED - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income	$ 189,703	$ 40,291
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,777	14,915
Provision/ (credit) for credit losses	(47,141)	90,158
Share based compensation expense	3,640	2,824
Deferred income tax/ (benefit)	12,280	(22,965)
Origination of loans held for sale	(1,211,421)	(1,042,787)
Proceeds from sales of loans held for sale	1,272,148	1,025,610
Gains on sales of loans held for sale	(27,111)	(17,850)
Losses on sale of other real estate owned	237	32
Investment securities gains	(178)	(432)
Tax benefit associated with share based compensation	1,316	(162)
Net (increase)/ decrease in accrued interest receivable	10,212	(17,243)
Net (increase)/ decrease other assets	(39,456)	1,812
Net increase/ (decrease) accrued expenses and other liabilities	(22,402)	5,173
Other, net	1,026	2,922
Net cash provided by operating activities	153,630	82,298
Investing activities:
Sales/ (purchases) of equity securities	24,663
Sales/ (purchases) of equity securities		(6,321)
Purchases of investments available-for-sale	(708,727)	(529,522)
Proceeds from sales of investment available-for-sale	360,945	121,357
Proceeds from maturities, calls and principal payments of investments available-for-sale	264,461	329,197
Net (increase)/ decrease in loans	696,399	(1,107,824)
Proceeds from the sales of other real estate owned	620	60
Cash paid for the acquisition of business activity of RPJ, net of cash acquired	0	(26,925)
Cash acquired in the acquisition of business activity of Revere Bank, net of cash paid	0	80,466
Expenditures for premises and equipment	(7,114)	(3,399)
Net cash provided by/ (used in) investing activities	631,247	(1,142,911)
Financing activities:
Net increase in deposits	957,888	1,202,228
Net increase/ (decrease) in in retail repurchase agreements and federal funds purchased	(395,653)	249,101
Proceeds from FHLB advances	0	400,000
Repayment of FHLB advances	(379,075)	(637,982)
Retirement of subordinated debt	(53,000)	(10,310)
Proceeds from issuance of common stock	4,164	1,474
Stock tendered for payment of withholding taxes	(1,577)	(463)
Repurchase of common stock	(54,321)	(25,702)
Dividends paid	(45,673)	(38,953)
Net cash provided by financing activities	32,753	1,139,393
Net increase in cash and cash equivalents	817,630	78,780
Cash and cash equivalents at beginning of period	297,003	146,103
Cash and cash equivalents at end of period	1,114,633	224,883
Supplemental disclosures:
Interest payments	31,173	47,105
Income tax payments, net of refunds of $2,673 in 2021	58,348	28,099
Transfers from loans to other real estate owned	$ 295	$ 0

CONDENSED CONSOLIDATED STATEM_8

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Parenthetical $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)
Statement of Cash Flows [Abstract]
Income tax refunds	$ 2,673

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2021
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, 2021 are not necessarily indicative of the results that may be expected for any future periods or for the year ending December 31, 2021. In the opinion of management, all adjustments necessary for a fair presentation of the results of the interim periods have been included. 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 2020 Annual Report on Form 10-K as filed with the Securities and Exchange Commission (“SEC”) on February 19, 2021. There have been no significant changes to any of the Company’s accounting policies as disclosed in the 2020 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 17 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. 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. Allowance for Credit Losses The allowance for credit losses (“allowance” or “ACL”) represents an amount which, in management's judgment, reflects 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 administration, 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 3 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. The Company reviews its unfunded commitments to determine if they are unconditionally cancellable by the Company. If the unfunded commitment is determined to not be unconditionally cancellable by the Company, a reserve for unfunded commitments is established. The reserve for unfunded commitments considers both the likelihood that the funding will occur and an estimate of expected credit losses over the life of the commitment. 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. 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. Periodic operating lease costs are recorded in occupancy expenses of premises on the Company's Condensed Consolidated Statements of Income. 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.

INVESTMENTS

INVESTMENTS	9 Months Ended
	Sep. 30, 2021
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, 2021 December 31, 2020 (In thousands) Amortized Gross Gross Estimated Amortized Gross Gross Estimated U.S. treasuries and government agencies $ 47,477 $ 260 $ (8) $ 47,729 $ 42,750 $ 549 $ (2) $ 43,297 State and municipal 325,384 5,486 (3,077) 327,793 377,108 13,470 (211) 390,367 Mortgage-backed and asset-backed 1,039,159 12,712 (5,247) 1,046,624 881,201 24,078 (847) 904,432 Corporate debt 7,000 409 — 7,409 9,100 825 — 9,925 Total investments available-for-sale $ 1,419,020 $ 18,867 $ (8,332) $ 1,429,555 $ 1,310,159 $ 38,922 $ (1,060) $ 1,348,021 Any unrealized losses in the U.S. treasuries and government agencies, state and municipal, mortgage-backed and asset-backed investment securities at September 30, 2021 are due to changes in interest rates and not credit-related events. As such, no allowance for credit losses is required at September 30, 2021. Unrealized losses on investment securities are expected to recover over time as these securities approach maturity. The Company does not intend to sell, nor is it more likely than not it will be required to sell, these securities and has sufficient liquidity to hold these securities for an adequate period of time, which may be maturity, to allow for any anticipated recovery in fair value. The mortgage-backed securities portfolio at September 30, 2021 is composed entirely of either the most senior tranches of GNMA, FNMA or FHLMC collateralized mortgage obligations ($312.1 million), GNMA, FNMA or FHLMC mortgage-backed securities ($677.4 million) or SBA asset-backed securities ($57.1 million). 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, 2021 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 2 $ 10,967 $ 8 $ — $ — $ 10,967 $ 8 State and municipal 36 90,013 2,169 14,643 908 104,656 3,077 Mortgage-backed and asset-backed 60 446,119 4,789 15,604 458 461,723 5,247 Total 98 $ 547,099 $ 6,966 $ 30,247 $ 1,366 $ 577,346 $ 8,332 December 31, 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 2 $ 25,369 $ 2 $ — $ — $ 25,369 $ 2 State and municipal 8 22,753 211 — — 22,753 211 Mortgage-backed and asset-backed 24 44,746 154 76,879 693 121,625 847 Total 34 $ 92,868 $ 367 $ 76,879 $ 693 $ 169,747 $ 1,060 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, 2021 December 31, 2020 (In thousands) Fair Value Amortized Cost Fair Value Amortized Cost U.S. treasuries and government agencies: One year or less $ 39,647 $ 39,559 $ 33,963 $ 33,833 One to five years 8,082 7,918 9,334 8,917 Five to ten years — — — — After ten years — — — — State and municipal: One year or less 14,173 14,009 16,581 16,458 One to five years 25,081 24,229 44,910 43,857 Five to ten years 43,958 43,207 59,059 56,130 After ten years 244,581 243,939 269,817 260,663 Mortgage-backed and asset-backed: One year or less 7,975 7,916 1 1 One to five years 15,344 15,063 21,637 21,229 Five to ten years 319,947 319,621 74,142 72,481 After ten years 703,358 696,559 808,652 787,490 Corporate debt: One year or less — — — — One to five years — — 2,318 2,100 Five to ten years 7,409 7,000 7,607 7,000 After ten years — — — — Total available-for-sale debt securities $ 1,429,555 $ 1,419,020 $ 1,348,021 $ 1,310,159 At September 30, 2021 and December 31, 2020, investments available-for-sale with a book value of $532.4 million and $465.7 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, 2021 and December 31, 2020. Equity securities Other equity securities at the dates indicated are presented in the following table: (In thousands) September 30, 2021 December 31, 2020 Federal Reserve Bank stock $ 34,028 $ 38,650 Federal Home Loan Bank of Atlanta stock 6,392 26,433 Marketable equity securities 677 677 Total equity securities $ 41,097 $ 65,760

LOANS

LOANS	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
LOANS	LOANS Outstanding loan balances at September 30, 2021 and December 31, 2020, are net of unearned income, including net deferred loan fees of $20.0 million and $24.5 million, respectively. Net deferred loan fees at September 30, 2021 and December 31, 2020, includes $13.0 million and $21.2 million, respectively, 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, 2021 December 31, 2020 Commercial real estate: Commercial investor real estate $ 3,743,698 $ 3,634,720 Commercial owner-occupied real estate 1,661,092 1,642,216 Commercial AD&C 1,177,949 1,050,973 Commercial business 1,594,528 2,267,548 Total commercial loans 8,177,267 8,595,457 Residential real estate: Residential mortgage 911,997 1,105,179 Residential construction 181,319 182,619 Consumer 450,765 517,254 Total residential and consumer loans 1,544,081 1,805,052 Total loans $ 9,721,348 $ 10,400,509 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, 2021
Credit Loss [Abstract]
CREDIT QUALITY ASSESSMENT	CREDIT QUALITY ASSESSMENT 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) 2021 2020 Balance at beginning of period $ 165,367 $ 56,132 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/ (credit) for credit losses (47,141) 90,158 Loan charge-offs (11,496) (1,255) Loan recoveries 1,190 906 Net charge-offs (10,306) (349) Balance at period end $ 107,920 $ 170,314 The following table provides summary information regarding collateral dependent loans individually evaluated for credit loss at the dates indicated: (In thousands) September 30, 2021 December 31, 2020 Collateral dependent loans individually evaluated for credit loss with an allowance $ 10,592 $ 20,717 Collateral dependent loans individually evaluated for credit loss without an allowance 27,831 77,001 Total individually evaluated collateral dependent loans $ 38,423 $ 97,718 Allowance for credit losses related to loans evaluated individually $ 7,537 $ 11,405 Allowance for credit losses related to loans evaluated collectively 100,383 153,962 Total allowance for credit losses $ 107,920 $ 165,367 The following tables provide 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, 2021 Commercial Real Estate Residential Real Estate (Dollars in thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Balance at beginning of period $ 57,404 $ 20,061 $ 22,157 $ 46,806 $ 11,295 $ 1,502 $ 6,142 $ 165,367 Provision/ (credit) for credit losses (15,822) (8,165) 8,538 (20,721) (6,607) (849) (3,515) (47,141) Charge-offs (5,802) (136) (2,007) (3,315) — — (236) (11,496) Recoveries 176 — — 375 330 3 306 1,190 Net recoveries (charge-offs) (5,626) (136) (2,007) (2,940) 330 3 70 (10,306) Balance at end of period $ 35,956 $ 11,760 $ 28,688 $ 23,145 $ 5,018 $ 656 $ 2,697 $ 107,920 Total loans $ 3,743,698 $ 1,661,092 $ 1,177,949 $ 1,594,528 $ 911,997 $ 181,319 $ 450,765 $ 9,721,348 Allowance for credit losses to total loans ratio 0.96 % 0.71 % 2.44 % 1.45 % 0.55 % 0.36 % 0.60 % 1.11 % Balance of loans individually evaluated for credit loss $ 15,386 $ 9,854 $ 1,022 $ 10,088 $ 1,716 $ — $ 357 $ 38,423 Allowance related to loans evaluated individually $ 203 $ — $ 509 $ 6,825 $ — $ — $ — $ 7,537 Individual allowance to loans evaluated individually ratio 1.32 % — % 49.80 % 67.65 % — % — % — % 19.62 % Balance of loans collectively evaluated for credit loss $ 3,728,312 $ 1,651,238 $ 1,176,927 $ 1,584,440 $ 910,281 $ 181,319 $ 450,408 $ 9,682,925 Allowance related to loans evaluated collectively $ 35,753 $ 11,760 $ 28,179 $ 16,320 $ 5,018 $ 656 $ 2,697 $ 100,383 Collective allowance to loans evaluated collectively ratio 0.96 % 0.71 % 2.39 % 1.03 % 0.55 % 0.36 % 0.60 % 1.04 % For the Year Ended December 31, 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 33,431 10,008 10,743 24,374 3,016 798 3,299 85,669 Charge-offs (411) — — (491) (484) — (433) (1,819) Recoveries 15 — — 702 105 6 184 1,012 Net recoveries (charge-offs) (396) — — 211 (379) 6 (249) (807) Balance at end of period $ 57,404 $ 20,061 $ 22,157 $ 46,806 $ 11,295 $ 1,502 $ 6,142 $ 165,367 Total loans $ 3,634,720 $ 1,642,216 $ 1,050,973 $ 2,267,548 $ 1,105,179 $ 182,619 $ 517,254 $ 10,400,509 Allowance for credit losses to total loans ratio 1.58 % 1.22 % 2.11 % 2.06 % 1.02 % 0.82 % 1.19 % 1.59 % Balance of loans individually evaluated for credit loss $ 45,227 $ 11,561 $ 15,044 $ 23,648 $ 1,874 $ — $ 364 $ 97,718 Allowance related to loans evaluated individually $ 1,273 $ — $ 603 $ 9,529 $ — $ — $ — $ 11,405 Individual allowance to loans evaluated individually ratio 2.81 % — % 4.01 % 40.30 % — % — % — % 11.67 % Balance of loans collectively evaluated for credit loss $ 3,589,493 $ 1,630,655 $ 1,035,929 $ 2,243,900 $ 1,103,305 $ 182,619 $ 516,890 $ 10,302,791 Allowance related to loans evaluated collectively $ 56,131 $ 20,061 $ 21,554 $ 37,277 $ 11,295 $ 1,502 $ 6,142 $ 153,962 Collective allowance to loans evaluated collectively ratio 1.56 % 1.23 % 2.08 % 1.66 % 1.02 % 0.82 % 1.19 % 1.49 % The following tables present collateral dependent loans individually evaluated for credit loss with the associated allowances for credit losses by the applicable portfolio segment and for the periods indicated: September 30, 2021 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 $ 808 $ — $ 1,022 $ 6,760 $ — $ — $ — $ 8,590 Restructured accruing — — — 529 — — — 529 Restructured non-accruing 336 — — 1,137 — — — 1,473 Balance $ 1,144 $ — $ 1,022 $ 8,426 $ — $ — $ — $ 10,592 Allowance $ 203 $ — $ 509 $ 6,825 $ — $ — $ — $ 7,537 Loans individually evaluated for credit loss without an allowance: Non-accruing $ 4,731 $ 5,318 $ — $ 400 $ — $ — $ — $ 10,449 Restructured accruing — — — 105 1,565 — — 1,670 Restructured non-accruing 9,511 4,536 — 1,157 151 — 357 15,712 Balance $ 14,242 $ 9,854 $ — $ 1,662 $ 1,716 $ — $ 357 $ 27,831 Total individually evaluated loans: Non-accruing $ 5,539 $ 5,318 $ 1,022 $ 7,160 $ — $ — $ — $ 19,039 Restructured accruing — — — 634 1,565 — — 2,199 Restructured non-accruing 9,847 4,536 — 2,294 151 — 357 17,185 Balance $ 15,386 $ 9,854 $ 1,022 $ 10,088 $ 1,716 $ — $ 357 $ 38,423 Total unpaid contractual principal balance $ 24,990 $ 11,867 $ 1,090 $ 11,912 $ 2,792 $ — $ 364 $ 53,015 December 31, 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 $ 4,913 $ — $ 1,328 $ 11,178 $ — $ — $ — $ 17,419 Restructured accruing — — — 589 — — — 589 Restructured non-accruing 699 — — 2,010 — — — 2,709 Balance $ 5,612 $ — $ 1,328 $ 13,777 $ — $ — $ — $ 20,717 Allowance $ 1,273 $ — $ 603 $ 9,529 $ — $ — $ — $ 11,405 Loans individually evaluated for credit loss without an allowance: Non-accruing $ 39,615 $ 9,315 $ 13,716 $ 9,118 $ — $ — $ — $ 71,764 Restructured accruing — — — 126 1,602 — — 1,728 Restructured non-accruing — 2,246 — 627 272 — 364 3,509 Balance $ 39,615 $ 11,561 $ 13,716 $ 9,871 $ 1,874 $ — $ 364 $ 77,001 Total individually evaluated loans: Non-accruing $ 44,528 $ 9,315 $ 15,044 $ 20,296 $ — $ — $ — $ 89,183 Restructured accruing — — — 715 1,602 — — 2,317 Restructured non-accruing 699 2,246 — 2,637 272 — 364 6,218 Balance $ 45,227 $ 11,561 $ 15,044 $ 23,648 $ 1,874 $ — $ 364 $ 97,718 Total unpaid contractual principal balance $ 49,920 $ 15,309 $ 16,040 $ 30,958 $ 3,225 $ — $ 364 $ 115,816 The following tables present average principal balance of total non-accrual loans and contractual interest due on non-accrual loans for the periods indicated below: For the Nine Months Ended September 30, 2021 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Average non-accrual loans for the period $ 36,365 $ 9,479 $ 11,383 $ 13,742 $ 9,689 $ 31 $ 7,530 $ 88,219 Contractual interest income due on non- accrual loans during the period $ 1,825 $ 645 $ 565 $ 847 $ 312 $ 2 $ 320 $ 4,516 For the Year Ended December 31, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Average non-accrual loans for the period $ 26,849 $ 6,605 $ 4,267 $ 16,532 $ 11,634 $ — $ 6,675 $ 72,562 Contractual interest income due on non- accrual loans during the period $ 6,547 $ 2,741 $ 4,505 $ 2,858 $ 918 $ — $ 732 $ 18,301 There was no interest income recognized on non-accrual loans during the nine months ended September 30, 2021. 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, 2021 new loans placed on non-accrual status totaled $7.6 million and the related amount of reversed uncollected accrued interest was $0.1 million. Credit Quality The following section provides information on the credit quality of the loan portfolio for the periods indicated below: For the Nine Months Ended September 30, 2021 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 $ 45,227 $ 11,561 $ 15,044 $ 22,933 $ 10,212 $ — $ 7,384 $ 112,361 Loans placed on non-accrual 699 3,676 49 963 687 62 1,499 7,635 Non-accrual balances transferred to OREO — (257) — — — — — (257) Non-accrual balances charged-off (5,803) (136) (2,007) (2,793) — — (100) (10,839) Net payments or draws (24,737) (4,990) (12,064) (11,649) (1,328) — (676) (55,444) Non-accrual loans brought current — — — — (60) — (281) (341) Balance at end of period $ 15,386 $ 9,854 $ 1,022 $ 9,454 $ 9,511 $ 62 $ 7,826 $ 53,115 For the Year Ended December 31, 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 37,882 8,572 15,844 17,442 1,485 — 4,061 85,286 Non-accrual balances transferred to OREO — — — — (70) — — (70) Non-accrual balances charged-off (411) — — (446) (416) — (121) (1,394) Net payments or draws (10,225) (1,059) (1,629) (4,169) (2,598) — (1,521) (21,201) Non-accrual loans brought current — (100) — (883) (858) — (135) (1,976) Balance at end of period $ 45,227 $ 11,561 $ 15,044 $ 22,933 $ 10,212 $ — $ 7,384 $ 112,361 (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, 2021 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Performing loans: Current $ 3,692,293 $ 1,646,076 $ 1,169,583 $ 1,579,499 $ 888,345 $ 180,496 $ 436,972 $ 9,593,264 30-59 days 10,984 — — 4,461 11,501 761 4,574 32,281 60-89 days 10,205 5,162 — 480 396 — 1,393 17,636 Total performing loans 3,713,482 1,651,238 1,169,583 1,584,440 900,242 181,257 442,939 9,643,181 Non-performing loans: Non-accrual loans 15,386 9,854 1,022 9,454 9,511 62 7,826 53,115 Loans greater than 90 days past due 14,830 — 7,344 — 679 — — 22,853 Restructured loans — — — 634 1,565 — — 2,199 Total non-performing loans 30,216 9,854 8,366 10,088 11,755 62 7,826 78,167 Total loans $ 3,743,698 $ 1,661,092 $ 1,177,949 $ 1,594,528 $ 911,997 $ 181,319 $ 450,765 $ 9,721,348 December 31, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Performing loans: Current $ 3,571,184 $ 1,624,265 $ 1,033,057 $ 2,238,617 $ 1,073,963 $ 182,557 $ 502,548 $ 10,226,191 30-59 days 14,046 6,390 29 4,859 16,213 — 5,275 46,812 60-89 days 4,130 — 2,843 263 2,709 62 2,047 12,054 Total performing loans 3,589,360 1,630,655 1,035,929 2,243,739 1,092,885 182,619 509,870 10,285,057 Non-performing loans: Non-accrual loans 45,227 11,561 15,044 22,933 10,212 — 7,384 112,361 Loans greater than 90 days past due 133 — — 161 480 — — 774 Restructured loans — — — 715 1,602 — — 2,317 Total non-performing loans 45,360 11,561 15,044 23,809 12,294 — 7,384 115,452 Total loans $ 3,634,720 $ 1,642,216 $ 1,050,973 $ 2,267,548 $ 1,105,179 $ 182,619 $ 517,254 $ 10,400,509 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 as of September 30, 2021: September 30, 2021 Term Loans by Origination Year Revolving (In thousands) 2021 2020 2019 2018 2017 Prior Loans Total Commercial Investor R/E: Pass $ 764,573 $ 782,273 $ 613,930 $ 408,936 $ 370,635 $ 723,877 $ 22,226 $ 3,686,450 Special Mention 2,283 4,980 4,276 602 684 6,924 — 19,749 Substandard 13,032 592 4,320 8,653 10,064 838 — 37,499 Doubtful — — — — — — — — Total $ 779,888 $ 787,845 $ 622,526 $ 418,191 $ 381,383 $ 731,639 $ 22,226 $ 3,743,698 Commercial Owner-Occupied R/E: Pass $ 267,459 $ 258,309 $ 326,143 $ 199,446 $ 174,397 $ 394,812 $ 4,755 $ 1,625,321 Special Mention 160 1,519 4,301 2,721 4,492 9,210 — 22,403 Substandard 1,237 2,585 4,134 2,280 359 2,773 — 13,368 Doubtful — — — — — — — — Total $ 268,856 $ 262,413 $ 334,578 $ 204,447 $ 179,248 $ 406,795 $ 4,755 $ 1,661,092 Commercial AD&C: Pass $ 373,212 $ 248,812 $ 240,404 $ 106,188 $ 28,985 $ — $ 169,051 $ 1,166,652 Special Mention 9,286 — — — — — 989 10,275 Substandard 49 390 577 — 6 — — 1,022 Doubtful — — — — — — — — Total $ 382,547 $ 249,202 $ 240,981 $ 106,188 $ 28,991 $ — $ 170,040 $ 1,177,949 Commercial Business: Pass $ 532,473 $ 245,034 $ 151,622 $ 110,341 $ 66,806 $ 61,688 $ 389,218 $ 1,557,182 Special Mention 109 2,247 7,634 1,711 673 554 8,094 21,022 Substandard 1,846 3,995 2,740 997 1,102 3,874 1,770 16,324 Doubtful — — — — — — — — Total $ 534,428 $ 251,276 $ 161,996 $ 113,049 $ 68,581 $ 66,116 $ 399,082 $ 1,594,528 Residential Mortgage: Beacon score: 660-850 $ 137,853 $ 170,633 $ 54,052 $ 81,896 $ 118,267 $ 255,214 $ — $ 817,915 600-659 9,209 4,443 4,375 7,036 4,063 23,653 — 52,779 540-599 499 1,379 1,822 4,737 2,469 10,596 — 21,502 less than 540 985 5,184 1,759 1,727 653 9,493 — 19,801 Total $ 148,546 $ 181,639 $ 62,008 $ 95,396 $ 125,452 $ 298,956 $ — $ 911,997 Residential Construction: Beacon score: 660-850 $ 95,213 $ 65,743 $ 9,013 $ 6,130 $ 1,248 $ 1,160 $ — $ 178,507 600-659 195 — 1,189 — — 396 — 1,780 540-599 — — — — — — — — less than 540 1,032 — — — — — — 1,032 Total $ 96,440 $ 65,743 $ 10,202 $ 6,130 $ 1,248 $ 1,556 $ — $ 181,319 Consumer: Beacon score: 660-850 $ 3,312 $ 1,441 $ 3,531 $ 3,632 $ 1,571 $ 29,118 $ 367,144 $ 409,749 600-659 220 196 329 591 481 5,278 14,135 21,230 540-599 104 15 241 186 161 2,563 6,165 9,435 less than 540 120 56 604 473 67 2,305 6,726 10,351 Total $ 3,756 $ 1,708 $ 4,705 $ 4,882 $ 2,280 $ 39,264 $ 394,170 $ 450,765 Total loans $ 2,214,461 $ 1,799,826 $ 1,436,996 $ 948,283 $ 787,183 $ 1,544,326 $ 990,273 $ 9,721,348 The following table provides information about credit quality indicators by the year of origination as of December 31, 2020: December 31, 2020 Term Loans by Origination Year Revolving (In thousands) 2020 2019 2018 2017 2016 Prior Loans Total Commercial Investor R/E: Pass $ 910,426 $ 763,214 $ 448,406 $ 448,698 $ 469,077 $ 498,384 $ 33,531 $ 3,571,736 Special Mention 11,044 — 4,879 833 269 27 — 17,052 Substandard 589 4,245 13,649 20,619 673 6,157 — 45,932 Doubtful — — — — — — — — Total $ 922,059 $ 767,459 $ 466,934 $ 470,150 $ 470,019 $ 504,568 $ 33,531 $ 3,634,720 Commercial Owner-Occupied R/E: Pass $ 285,310 $ 385,058 $ 234,578 $ 192,634 $ 204,925 $ 306,840 $ 1,664 $ 1,611,009 Special Mention 2,290 — 3,027 4,742 134 4,079 — 14,272 Substandard 1,610 4,335 2,065 465 219 8,009 — 16,703 Doubtful — — — — — 232 — 232 Total $ 289,210 $ 389,393 $ 239,670 $ 197,841 $ 205,278 $ 319,160 $ 1,664 $ 1,642,216 Commercial AD&C: Pass $ 485,631 $ 261,537 $ 149,703 $ 50,192 $ 89 $ 2,357 $ 80,764 $ 1,030,273 Special Mention 1,711 — — — — — — 1,711 Substandard 1,439 891 — 13,816 2,843 — — 18,989 Doubtful — — — — — — — — Total $ 488,781 $ 262,428 $ 149,703 $ 64,008 $ 2,932 $ 2,357 $ 80,764 $ 1,050,973 Commercial Business: Pass $ 1,244,822 $ 208,682 $ 138,861 $ 86,830 $ 34,498 $ 81,760 $ 433,016 $ 2,228,469 Special Mention 1,929 1,382 1,119 708 309 621 4,319 10,387 Substandard 2,914 4,564 3,519 1,631 2,745 3,456 1,829 20,658 Doubtful 106 995 849 36 1,284 1,852 2,912 8,034 Total $ 1,249,771 $ 215,623 $ 144,348 $ 89,205 $ 38,836 $ 87,689 $ 442,076 $ 2,267,548 Residential Mortgage: Beacon score: 660-850 $ 229,033 $ 74,054 $ 138,824 $ 172,493 $ 129,701 $ 251,065 $ — $ 995,170 600-659 4,824 7,706 10,763 11,719 8,173 21,424 — 64,609 540-599 350 1,238 5,219 2,608 4,791 10,167 — 24,373 less than 540 2,702 2,108 3,576 2,150 892 9,599 — 21,027 Total $ 236,909 $ 85,106 $ 158,382 $ 188,970 $ 143,557 $ 292,255 $ — $ 1,105,179 Residential Construction: Beacon score: 660-850 $ 112,604 $ 44,647 $ 14,543 $ 2,805 $ 1,693 $ — $ 172 $ 176,464 600-659 1,743 3,189 — — — — — 4,932 540-599 — — — — 369 — — 369 less than 540 854 — — — — — — 854 Total $ 115,201 $ 47,836 $ 14,543 $ 2,805 $ 2,062 $ — $ 172 $ 182,619 Consumer: Beacon score: 660-850 $ 2,575 $ 4,609 $ 5,112 $ 2,110 $ 2,614 $ 24,444 $ 417,737 $ 459,201 600-659 374 445 334 428 467 5,401 21,052 28,501 540-599 89 1,216 294 339 601 3,926 6,153 12,618 less than 540 751 160 525 785 532 2,826 11,355 16,934 Total $ 3,789 $ 6,430 $ 6,265 $ 3,662 $ 4,214 $ 36,597 $ 456,297 $ 517,254 Total loans $ 3,305,720 $ 1,774,275 $ 1,179,845 $ 1,016,641 $ 866,898 $ 1,242,626 $ 1,014,504 $ 10,400,509 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, 2021 Commercial Real Estate (In thousands) Commercial Commercial Commercial Commercial All Total Troubled debt restructurings: Restructured accruing $ — $ — $ — $ — $ — $ — Restructured non-accruing 9,594 3,157 — 726 — 13,477 Balance $ 9,594 $ 3,157 $ — $ 726 $ — $ 13,477 Individual allowance $ — $ — $ — $ 214 $ — $ 214 Restructured and subsequently defaulted $ — $ — $ — $ — $ — $ — For the Year Ended December 31, 2020 Commercial Real Estate (In thousands) Commercial Commercial Commercial Commercial All Total Troubled debt restructurings: Restructured accruing $ — $ — $ — $ 380 $ 549 $ 929 Restructured non-accruing 723 930 — 1,951 — 3,604 Balance $ 723 $ 930 $ — $ 2,331 $ 549 $ 4,533 Individual allowance $ 65 $ — $ — $ 955 $ — $ 1,020 Restructured and subsequently defaulted $ — $ — $ — $ — $ — $ — During the nine months ended September 30, 2021, the Company restructured $13.5 million in loans that were designated as TDRs. TDR loans are subject to periodic credit reviews to determine the necessity and appropriateness of an individual credit loss allowance based on the collectability of the recorded investment in the TDR loan. Loans restructured as TDRs during the nine months ended September 30, 2021 had individual reserves of $0.2 million. For the year ended December 31, 2020, the Company restructured $4.5 million in loans. Loans restructured as TDRs during 2020 had individual reserves of $1.0 million at December 31, 2020. During both the nine months ended September 30, 2021 and for the year ended December 31, 2020 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, 2021 and December 31, 2020 were not significant. Other Real Estate Owned Other real estate owned ("OREO") totaled $1.1 million and $1.5 million at September 30, 2021 and December 31, 2020, respectively. There were no consumer mortgage loans secured by residential real estate property for which formal foreclosure proceedings were in process as of September 30, 2021.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	9 Months Ended
	Sep. 30, 2021
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, 2021 Weighted December 31, 2020 Weighted (Dollars in thousands) Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets: Core deposit intangibles $ 29,038 $ (11,496) $ 17,542 7.7 years $ 29,038 $ (7,969) $ 21,069 8.4 years Other identifiable intangibles 13,906 (3,917) 9,989 10.0 years 13,906 (2,454) 11,452 10.7 years Total amortizing intangible assets $ 42,944 $ (15,413) $ 27,531 $ 42,944 $ (10,423) $ 32,521 Goodwill $ 370,223 $ 370,223 $ 370,223 $ 370,223 The amount of goodwill by reportable segment is presented in the following table: (In thousands) Community Insurance Investment Total Balances at December 31, 2020 $ 331,688 $ 6,788 $ 31,747 $ 370,223 No Activity — — — — Balances at September 30, 2021 $ 331,688 $ 6,788 $ 31,747 $ 370,223 The following table presents the estimated future amortization expense for amortizing intangible assets within the years ending December 31: (In thousands) Amount Remaining 2021 $ 1,610 2022 5,844 2023 5,089 2024 4,333 2025 3,567 Thereafter 7,088 Total amortizing intangible assets $ 27,531

DEPOSITS

DEPOSITS	9 Months Ended
	Sep. 30, 2021
Deposits [Abstract]
DEPOSITS	DEPOSITS The following table presents the composition of deposits at the dates indicated: (In thousands) September 30, 2021 December 31, 2020 Noninterest-bearing deposits $ 3,987,411 $ 3,325,547 Interest-bearing deposits: Demand 1,399,060 1,292,164 Money market savings 3,595,643 3,339,645 Regular savings 496,432 418,051 Time deposits of less than $100,000 435,139 509,919 Time deposits greater than $100,000 and less than $250,000 643,414 670,717 Time deposits of $250,000 or more 430,301 477,026 Total interest-bearing deposits 6,999,989 6,707,522 Total deposits $ 10,987,400 $ 10,033,069

BORROWINGS

BORROWINGS	9 Months Ended
	Sep. 30, 2021
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. The premium was amortized over the contractual life of the obligation. The subordinated debt had a maturity of 10 years, maturing on October 15, 2025, and was non-callable through October 15, 2020. The subordinated debt held a fixed interest rate of 6.00% per annum through October 5, 2020 at which point the rate became variable at the three-month LIBOR plus 457 basis points payable quarterly. On July 15, 2021, the Company redeemed the entire outstanding principal balance of the WashingtonFirst subordinated debt. In conjunction with the acquisition of Revere Bank ("Revere"), the Company assumed $31.0 million in subordinated debt with an associated purchase premium at acquisition of $0.2 million, which was amortized through the call date. The subordinated debt had a 10-year term, maturing on September 30, 2026, and was non-callable until September 30, 2021. The subordinated debt had a fixed interest rate of 5.625% per annum, payable semi-annually, through September 30, 2021 at which point the interest rate reset quarterly to an amount equal to three month LIBOR plus 441 basis points. On September 30, 2021, the Company redeemed the entire outstanding principal balance of the Revere subordinated debt. The following table provides information on subordinated debt as of the date indicated: (In thousands) September 30, 2021 December 31, 2020 Fixed to floating rate sub debt, 4.25% $ 175,000 $ 175,000 WashingtonFirst sub debt — 25,000 Revere fixed to floating rate sub debt — 31,000 Total Sub debt 175,000 231,000 Less: Debt held as investments by Sandy Spring — (3,000) Add: Purchase accounting premium — 1,669 Less: Debt issuance costs (2,361) (2,581) Long-term borrowings $ 172,639 $ 227,088 Other Borrowings At September 30, 2021 and December 31, 2020, the Company had $147.5 million and $153.2 million, respectively, of outstanding retail repurchase agreements. The Company had no outstanding federal funds purchased at September 30, 2021 and $390.0 million at December 31, 2020. At September 30, 2021, the Company did not have any borrowings outstanding under the Paycheck Protection Program Liquidity Facility ("PPPLF"). At September 30, 2021, the Company had an available line of credit with the FHLB under which its borrowings are limited to $3.9 billion based on pledged collateral at prevailing market interest rates, with no outstanding borrowings against it at September 30, 2021. At December 31, 2020, lines of credit with the FHLB totaled $3.0 billion based on pledged collateral with $379.1 million borrowed against the line. During the nine months ended September 30, 2021, the Company early repaid $279.0 million of FHLB advances, resulting in a prepayment penalty of $9.1 million, which was recorded to other expense in the Condensed Consolidated Statements of Income. Under a blanket lien, the Company has pledged qualifying residential mortgage loans amounting to $786.8 million, commercial real estate loans amounting to $2.8 billion, home equity lines of credit (“HELOC”) amounting to $226.4 million, and multifamily loans amounting to $303.2 million at September 30, 2021, as collateral under the borrowing agreement with the FHLB. At December 31, 2020, the Company had pledged collateral of qualifying mortgage loans of $1.0 billion, commercial real estate loans of $2.8 billion, HELOC loans of $226.2 million, and multifamily loans of $237.6 million under the FHLB borrowing agreement. The Company also had secured lines of credit available from the Federal Reserve Bank and correspondent banks of $108.6 million and $276.2 million at September 30, 2021 and December 31, 2020, respectively, collateralized by loans, with no borrowings outstanding at the end of either period. In addition, the Company had unsecured lines of credit with correspondent banks of $1.4 billion and $1.1 billion at September 30, 2021 and December 31, 2020, respectively. Of the unsecured lines of

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY	9 Months Ended
	Sep. 30, 2021
Stockholders' Equity Note [Abstract]
STOCKHOLDERS' EQUITY	STOCKHOLDERS' EQUITYIn December 2020, the Company's board of directors authorized a stock repurchase plan that permits the repurchase of up to 2,350,000 shares of common stock. During the nine months ended September 30, 2021, the Company repurchased and retired 1,261,828 shares of common stock at an average price of $43.05 per share for a total cost of $54.3 million. Under the previous stock repurchase plan that was approved in 2018 and expired in December 2020, the Company was authorized to repurchase up to 1,800,000 shares. During the nine months ended September 30, 2020, the Company repurchased and retired 820,328 common shares for the total cost of $25.7 million. Cumulatively under the previous plan, as of December 31, 2020, the Company repurchased and retired 1,488,519 shares of its common stock at an average price of $33.58 per share for a total cumulative cost of $50.0 million.

SHARE BASED COMPENSATION

SHARE BASED COMPENSATION	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
SHARE BASED COMPENSATION	SHARE BASED COMPENSATION At September 30, 2021, 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 790,800 are available for issuance at September 30, 2021, has a term of 10 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 $1.3 million and $1.0 million for the three months ended September 30, 2021 and 2020, respectively, and of $3.6 million and $2.8 million, for the nine months ended September 30, 2021 and 2020, respectively, related to the awards of stock options, restricted stock grants, restricted stock unit grants and performance share unit grants. There was no unrecognized compensation cost related to stock options as of September 30, 2021. The total of unrecognized compensation cost related to restricted stock awards, restricted stock unit grants, and performance share unit grants was approximately $9.4 million as of September 30, 2021. That cost is expected to be recognized over a weighted average period of approximately 2.30 years. During the nine months ended September 30, 2021, the Company granted 128,557 restricted shares, restricted stock units and performance share units, of which 32,728 units are subject to achievement of certain performance conditions measured over a three-year performance period and 95,829 restricted shares or units are subject to a three year vesting schedule. The Company did not grant any stock options under the Omnibus Incentive Plan during the nine months ended September 30, 2021. A summary of share option activity for the period indicated is reflected in the following table: Number Weighted Weighted Aggregate Balance at January 1, 2021 430,038 $ 14.97 3.0 years $ 6,828 Granted — $ — Exercised (193,602) $ 13.35 $ 5,356 Forfeited — $ — Expired — $ — Balance at September 30, 2021 236,436 $ 16.30 2.5 years $ 6,311 Exercisable at September 30, 2021 236,436 $ 16.30 2.5 years $ 6,311 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 January 1, 2021 391,683 $ 29.50 Granted 128,557 $ 41.05 Vested (119,228) $ 31.48 Forfeited/ cancelled (6,859) $ 34.33 Non-vested at September 30, 2021 394,153 $ 32.62

PENSION PLAN

PENSION PLAN	9 Months Ended
	Sep. 30, 2021
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) 2021 2020 2021 2020 Interest cost on projected benefit obligation $ 316 $ 359 $ 952 $ 1,078 Expected return on plan assets (312) (456) (936) (1,368) Recognized net actuarial loss 228 219 682 656 Net periodic benefit cost $ 232 $ 122 $ 698 $ 366 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 made a $1.0 million contribution during the nine months ended September 30, 2021. Management continues to monitor the funding level of the Plan and may make additional contributions as necessary during 2021.

NET INCOME PER COMMON SHARE

NET INCOME PER COMMON SHARE	9 Months Ended
	Sep. 30, 2021
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) 2021 2020 2021 2020 Net income $ 56,976 $ 44,642 $ 189,703 $ 40,291 Distributed and undistributed earnings allocated to (354) (373) (1,219) (317) Net income attributable to common shareholders $ 56,622 $ 44,269 $ 188,484 $ 39,974 Total weighted average outstanding shares 47,197 47,415 47,409 43,261 Less: Weighted average participating securities (294) (397) (307) (355) Basic weighted average common shares 46,903 47,018 47,102 42,906 Dilutive weighted average common stock equivalents 184 157 213 165 Diluted weighted average common shares 47,087 47,175 47,315 43,071 Basic net income per common share $ 1.21 $ 0.94 $ 4.00 $ 0.93 Diluted net income per common share $ 1.20 $ 0.94 $ 3.98 $ 0.93 Anti-dilutive shares — 37 — 22

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME/ (LOSS)	9 Months Ended
	Sep. 30, 2021
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, 2021 $ 28,175 $ (9,470) $ 18,705 Other comprehensive loss before reclassification, net of tax (20,218) — (20,218) Reclassifications from accumulated other comprehensive income, net of tax (133) 520 387 Current period change in other comprehensive income, net of tax (20,351) 520 (19,831) Balance at September 30, 2021 $ 7,824 $ (8,950) $ (1,126) (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 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) 2021 2020 Unrealized gains on investments available-for-sale: Affected line item in the Statements of Income: Investment securities gains $ 178 $ 432 Income before taxes 178 432 Tax expense (45) (110) Net income $ 133 $ 322 Amortization of defined benefit pension plan items: Affected line item in the Statements of Income: Recognized actuarial loss (1) $ (682) $ (656) Loss before taxes (682) (656) Tax benefit 162 159 Net loss $ (520) $ (497) (1) This amount is included in the computation of net periodic benefit cost. See Note 10 for additional information on the pension plan.

LEASES

LEASES	9 Months Ended
	Sep. 30, 2021
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, 2021 2020 2021 2020 Components of lease expense: Operating lease cost (resulting from lease payments) $ 3,047 $ 3,154 $ 9,333 $ 9,281 Supplemental cash flow information related to leases: Operating cash flows from operating leases $ 3,208 $ 4,158 $ 9,762 $ 10,160 ROU assets obtained in the exchange for lease liabilities due to: New leases $ — $ — $ 803 $ — Acquisitions $ — $ — $ — $ 7,720 September 30, 2021 December 31, 2020 Supplemental balance sheet information related to leases: Operating lease ROU assets $ 59,597 $ 65,215 Operating lease liabilities $ 69,060 $ 74,982 Other information related to leases: Weighted average remaining lease term of operating leases 9.1 years 9.5 years Weighted average discount rate of operating leases 2.92% 3.04% At September 30, 2021, the maturities of the Company’s operating lease liabilities were as follows: (In thousands) Amount Maturity: Remaining 2021 $ 3,169 2022 11,368 2023 11,332 2024 9,423 2025 7,596 Thereafter 37,302 Total undiscounted lease payments 80,190 Less: Present value discount (11,130) Lease liability $ 69,060 The Company recognized lease liabilities of $1.8 million and ROU assets of $1.5 million for two operating leases that have not yet commenced operations at September 30, 2021. One lease is expected to commence operations during the fourth quarter of 2021 and one is expected to commence operations during the first quarter of 2022. The associated ROU assets include approximately $0.2 million of tenant allowances for improvements to the spaces. The Company does not have any lease arrangements with any of its related parties as of September 30, 2021.

DERIVATIVES

DERIVATIVES	9 Months Ended
	Sep. 30, 2021
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 $391.1 million as of September 30, 2021 compared to $320.5 million as of December 31, 2020. The fair values of swap positions net to zero 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, 2021
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, 2021
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, 2021 Quoted Prices in Significant Other Significant (In thousands) (Level 1) (Level 2) (Level 3) Total Assets: Residential mortgage loans held for sale (1) $ — $ 44,678 $ — $ 44,678 Investments available-for-sale: U.S. treasuries and government agencies — 47,729 — 47,729 State and municipal — 327,793 — 327,793 Mortgage-backed and asset-backed — 1,046,624 — 1,046,624 Corporate debt — — 7,409 7,409 Total investments available-for-sale — 1,422,146 7,409 1,429,555 Interest rate swap agreements — 6,290 — 6,290 Total assets $ — $ 1,473,114 $ 7,409 $ 1,480,523 Liabilities: Interest rate swap agreements $ — $ (6,290) $ — $ (6,290) Total liabilities $ — $ (6,290) $ — $ (6,290) (1) The outstanding principal balance for residential loans held for sale as of September 30, 2021 was $43.5 million. December 31, 2020 Quoted Prices in Significant Other Significant (In thousands) (Level 1) (Level 2) (Level 3) Total Assets: Residential mortgage loans held for sale (1) $ — $ 78,294 $ — $ 78,294 Investments available-for-sale: U.S. treasuries and government agencies — 43,297 — 43,297 State and municipal — 390,367 — 390,367 Mortgage-backed and asset-backed — 904,432 — 904,432 Corporate debt — — 9,925 9,925 Total investments available-for-sale — 1,338,096 9,925 1,348,021 Interest rate swap agreements — 9,183 — 9,183 Total assets $ — $ 1,425,573 $ 9,925 $ 1,435,498 Liabilities: Interest rate swap agreements $ — $ (9,183) $ — $ (9,183) Total liabilities $ — $ (9,183) $ — $ (9,183) (1) The outstanding principal balance for residential loans held for sale as of December 31, 2020 was $75.5 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, 2021 $ 9,925 Additions of Level 3 assets — Sales of Level 3 assets (2,102) Total unrealized loss included in other comprehensive income/ (loss) (414) Balance at September 30, 2021 $ 7,409 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, 2021 (In thousands) Quoted Prices in Significant Significant Total Total Losses Loans (1) $ — $ — $ 721 $ 721 $ (6,771) Other real estate owned — — 1,105 1,105 (74) Total $ — $ — $ 1,826 $ 1,826 $ (6,845) (1) Amounts represent the fair value of collateral for collateral dependent non-accrual loans allocated to the allowance for credit losses. Fair values are determined using actual market prices (Level 2), independent third party valuations and borrower records, discounted as appropriate (Level 3). December 31, 2020 (In thousands) Quoted Prices in Significant Significant Total Total Losses Loans (1) $ — $ — $ 13,901 $ 13,901 $ (11,326) Other real estate owned — — 1,455 1,455 (286) Total $ — $ — $ 15,356 $ 15,356 $ (11,612) (1) Amounts represent the fair value of collateral for collateral dependent non-accrual loans allocated to the allowance for credit losses. Fair values are determined using actual market prices (Level 2), independent third party valuations and borrower records, discounted as appropriate (Level 3). At September 30, 2021, loans totaling $38.4 million were written down to fair value of $30.9 million as a result of individual credit loss allowances of $7.5 million associated with the collateral dependent loans. Loans totaling $97.7 million were written down to fair value of $86.3 million at December 31, 2020 as a result of individual credit loss allowances of $11.4 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, 2021 Quoted Prices in Significant Other Significant (In thousands) Carrying Estimated Financial assets: Cash and cash equivalents $ 1,114,633 $ 1,114,633 $ 1,114,633 $ — $ — Residential mortgage loans held for sale 44,678 44,678 — 44,678 — Investments available-for-sale 1,429,555 1,429,555 — 1,422,146 7,409 Equity securities 41,097 41,097 41,097 — — Loans, net of allowance 9,613,428 9,677,624 — — 9,677,624 Interest rate swap agreements 6,290 6,290 — 6,290 — Accrued interest receivable 36,219 36,219 36,219 — — Bank owned life insurance 146,710 146,710 — 146,710 — Financial liabilities: Time deposits $ 1,508,854 $ 1,515,231 $ — $ 1,515,231 $ — Other deposits 9,478,546 9,478,546 9,478,546 — — Securities sold under retail repurchase agreements and federal funds purchased 147,504 147,504 — 147,504 — Advances from FHLB — — — — — Subordinated debt 172,639 174,659 — — 174,659 Interest rate swap agreements 6,290 6,290 — 6,290 — Accrued interest payable 3,714 3,714 3,714 — — Fair Value Measurements December 31, 2020 Quoted Prices in Significant Other Significant (In thousands) Carrying Estimated Financial assets: Cash and cash equivalents $ 297,003 $ 297,003 $ 297,003 $ — $ — Residential mortgage loans held for sale 78,294 78,294 — 78,294 — Investments available-for-sale 1,348,021 1,348,021 — 1,338,096 9,925 Equity securities 65,760 65,760 65,760 — — Loans, net of allowance 10,235,142 10,336,355 — — 10,336,355 Interest rate swap agreements 9,183 9,183 — 9,183 — Accrued interest receivable 46,431 46,431 46,431 — — Bank owned life insurance 126,887 126,887 — 126,887 — Financial liabilities: Time deposits $ 1,657,662 $ 1,674,112 $ — $ 1,674,112 $ — Other deposits 8,375,407 8,375,407 8,375,407 — — Securities sold under retail repurchase agreements and federal funds purchased 543,157 543,157 — 543,157 — Advances from FHLB 379,075 390,593 — 390,593 — Subordinated debt 227,088 227,512 — — 227,512 Interest rate swap agreements 9,183 9,183 — 9,183 — Accrued interest payable 3,254 3,254 3,254 — —

SEGMENT REPORTING

SEGMENT REPORTING	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
SEGMENT REPORTING	SEGMENT REPORTING Currently, 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 are related to this segment. 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 $1.2 million and $1.4 million for the three months ended September 30, 2021 and 2020, respectively, and were $3.5 million and $3.2 million for the nine months ended September 30, 2021 and 2020, 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 immaterial for the three and nine months ended September 30, 2021 and 2020. 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 $3.8 billion in combined assets under management as of September 30, 2021. 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 for both the three months ended September 30, 2021 and 2020, respectively, and were $1.4 million for both the nine months ended September 30, 2021 and 2020, respectively. 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, 2021 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 111,129 $ — $ 3 $ (3) $ 111,129 Interest expense 4,528 — — (3) 4,525 Provision/ (credit) for credit losses (8,229) — — — (8,229) Non-interest income 16,644 2,282 5,685 (217) 24,394 Non-interest expense 58,059 1,696 3,643 (217) 63,181 Income/(loss) before income taxes 73,415 586 2,045 — 76,046 Income tax expense/ (benefit) 18,385 185 500 — 19,070 Net income/ (loss) $ 55,030 $ 401 $ 1,545 $ — $ 56,976 Assets $ 13,017,464 $ 9,203 $ 57,324 $ (66,527) $ 13,017,464 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/ (loss) before income taxes 57,369 540 1,025 — 58,934 Income tax expense/ (benefit) 13,912 149 231 — 14,292 Net income/ (loss) $ 43,457 $ 391 $ 794 $ — $ 44,642 Assets $ 12,678,396 $ 11,289 $ 57,088 $ (68,642) $ 12,678,131 Nine Months Ended September 30, 2021 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 340,213 $ 2 $ 7 $ (9) $ 340,213 Interest expense 20,972 — — (9) 20,963 Provision/ (credit) for credit losses (47,141) — — — (47,141) Non-interest income 62,083 5,679 16,408 (4,651) 79,519 Non-interest expense 179,803 4,507 10,670 (651) 194,329 Income before income taxes 248,662 1,174 5,745 (4,000) 251,581 Income tax expense 59,951 347 1,580 — 61,878 Net income $ 188,711 $ 827 $ 4,165 $ (4,000) $ 189,703 Assets $ 13,017,464 $ 9,203 $ 57,324 $ (66,527) $ 13,017,464 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/ (loss) before income taxes 46,221 1,132 2,182 — 49,535 Income tax expense/ (benefit) 8,396 313 535 — 9,244 Net income/ (loss) $ 37,825 $ 819 $ 1,647 $ — $ 40,291 Assets $ 12,678,396 $ 11,289 $ 57,088 $ (68,642) $ 12,678,131

SIGNIFICANT ACCOUNTING POLICI_2

SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 30, 2021
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, 2021 are not necessarily indicative of the results that may be expected for any future periods or for the year ending December 31, 2021. In the opinion of management, all adjustments necessary for a fair presentation of the results of the interim periods have been included. 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 2020 Annual Report on Form 10-K as filed with the Securities and Exchange Commission (“SEC”) on February 19, 2021. There have been no significant changes to any of the Company’s accounting policies as disclosed in the 2020 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 17 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. 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.
Allowance for Credit Losses	Allowance for Credit Losses The allowance for credit losses (“allowance” or “ACL”) represents an amount which, in management's judgment, reflects 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 administration, 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 3 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. The Company reviews its unfunded commitments to determine if they are unconditionally cancellable by the Company. If the unfunded commitment is determined to not be unconditionally cancellable by the Company, a reserve for unfunded commitments is established. The reserve for unfunded commitments considers both the likelihood that the funding will occur and an estimate of expected credit losses over the life of the commitment. 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.
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
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. Periodic operating lease costs are recorded in occupancy expenses of premises on the Company's Condensed Consolidated Statements of Income. 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.

INVESTMENTS (Tables)

INVESTMENTS (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Unrealized Gain (Loss) on Investments	The amortized cost and estimated fair values of investments available-for-sale at the dates indicated are presented in the following table: September 30, 2021 December 31, 2020 (In thousands) Amortized Gross Gross Estimated Amortized Gross Gross Estimated U.S. treasuries and government agencies $ 47,477 $ 260 $ (8) $ 47,729 $ 42,750 $ 549 $ (2) $ 43,297 State and municipal 325,384 5,486 (3,077) 327,793 377,108 13,470 (211) 390,367 Mortgage-backed and asset-backed 1,039,159 12,712 (5,247) 1,046,624 881,201 24,078 (847) 904,432 Corporate debt 7,000 409 — 7,409 9,100 825 — 9,925 Total investments available-for-sale $ 1,419,020 $ 18,867 $ (8,332) $ 1,429,555 $ 1,310,159 $ 38,922 $ (1,060) $ 1,348,021
Schedule of Unrealized Loss on Investments	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, 2021 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 2 $ 10,967 $ 8 $ — $ — $ 10,967 $ 8 State and municipal 36 90,013 2,169 14,643 908 104,656 3,077 Mortgage-backed and asset-backed 60 446,119 4,789 15,604 458 461,723 5,247 Total 98 $ 547,099 $ 6,966 $ 30,247 $ 1,366 $ 577,346 $ 8,332 December 31, 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 2 $ 25,369 $ 2 $ — $ — $ 25,369 $ 2 State and municipal 8 22,753 211 — — 22,753 211 Mortgage-backed and asset-backed 24 44,746 154 76,879 693 121,625 847 Total 34 $ 92,868 $ 367 $ 76,879 $ 693 $ 169,747 $ 1,060
Estimated fair values of debt securities available-for-sale by contractual maturity	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, 2021 December 31, 2020 (In thousands) Fair Value Amortized Cost Fair Value Amortized Cost U.S. treasuries and government agencies: One year or less $ 39,647 $ 39,559 $ 33,963 $ 33,833 One to five years 8,082 7,918 9,334 8,917 Five to ten years — — — — After ten years — — — — State and municipal: One year or less 14,173 14,009 16,581 16,458 One to five years 25,081 24,229 44,910 43,857 Five to ten years 43,958 43,207 59,059 56,130 After ten years 244,581 243,939 269,817 260,663 Mortgage-backed and asset-backed: One year or less 7,975 7,916 1 1 One to five years 15,344 15,063 21,637 21,229 Five to ten years 319,947 319,621 74,142 72,481 After ten years 703,358 696,559 808,652 787,490 Corporate debt: One year or less — — — — One to five years — — 2,318 2,100 Five to ten years 7,409 7,000 7,607 7,000 After ten years — — — — Total available-for-sale debt securities $ 1,429,555 $ 1,419,020 $ 1,348,021 $ 1,310,159
Other Equity Securities	Other equity securities at the dates indicated are presented in the following table: (In thousands) September 30, 2021 December 31, 2020 Federal Reserve Bank stock $ 34,028 $ 38,650 Federal Home Loan Bank of Atlanta stock 6,392 26,433 Marketable equity securities 677 677 Total equity securities $ 41,097 $ 65,760

LOANS (Tables)

LOANS (Tables)	9 Months Ended
	Sep. 30, 2021
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, 2021 December 31, 2020 Commercial real estate: Commercial investor real estate $ 3,743,698 $ 3,634,720 Commercial owner-occupied real estate 1,661,092 1,642,216 Commercial AD&C 1,177,949 1,050,973 Commercial business 1,594,528 2,267,548 Total commercial loans 8,177,267 8,595,457 Residential real estate: Residential mortgage 911,997 1,105,179 Residential construction 181,319 182,619 Consumer 450,765 517,254 Total residential and consumer loans 1,544,081 1,805,052 Total loans $ 9,721,348 $ 10,400,509

CREDIT QUALITY ASSESSMENT (Tabl

CREDIT QUALITY ASSESSMENT (Tables)	9 Months Ended
	Sep. 30, 2021
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) 2021 2020 Balance at beginning of period $ 165,367 $ 56,132 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/ (credit) for credit losses (47,141) 90,158 Loan charge-offs (11,496) (1,255) Loan recoveries 1,190 906 Net charge-offs (10,306) (349) Balance at period end $ 107,920 $ 170,314
Activity in Allowance for Credit Losses or Loan and Lease Losses by Respective Loan Portfolio Segment	The following table provides summary information regarding collateral dependent loans individually evaluated for credit loss at the dates indicated: (In thousands) September 30, 2021 December 31, 2020 Collateral dependent loans individually evaluated for credit loss with an allowance $ 10,592 $ 20,717 Collateral dependent loans individually evaluated for credit loss without an allowance 27,831 77,001 Total individually evaluated collateral dependent loans $ 38,423 $ 97,718 Allowance for credit losses related to loans evaluated individually $ 7,537 $ 11,405 Allowance for credit losses related to loans evaluated collectively 100,383 153,962 Total allowance for credit losses $ 107,920 $ 165,367 The following tables provide 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, 2021 Commercial Real Estate Residential Real Estate (Dollars in thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Balance at beginning of period $ 57,404 $ 20,061 $ 22,157 $ 46,806 $ 11,295 $ 1,502 $ 6,142 $ 165,367 Provision/ (credit) for credit losses (15,822) (8,165) 8,538 (20,721) (6,607) (849) (3,515) (47,141) Charge-offs (5,802) (136) (2,007) (3,315) — — (236) (11,496) Recoveries 176 — — 375 330 3 306 1,190 Net recoveries (charge-offs) (5,626) (136) (2,007) (2,940) 330 3 70 (10,306) Balance at end of period $ 35,956 $ 11,760 $ 28,688 $ 23,145 $ 5,018 $ 656 $ 2,697 $ 107,920 Total loans $ 3,743,698 $ 1,661,092 $ 1,177,949 $ 1,594,528 $ 911,997 $ 181,319 $ 450,765 $ 9,721,348 Allowance for credit losses to total loans ratio 0.96 % 0.71 % 2.44 % 1.45 % 0.55 % 0.36 % 0.60 % 1.11 % Balance of loans individually evaluated for credit loss $ 15,386 $ 9,854 $ 1,022 $ 10,088 $ 1,716 $ — $ 357 $ 38,423 Allowance related to loans evaluated individually $ 203 $ — $ 509 $ 6,825 $ — $ — $ — $ 7,537 Individual allowance to loans evaluated individually ratio 1.32 % — % 49.80 % 67.65 % — % — % — % 19.62 % Balance of loans collectively evaluated for credit loss $ 3,728,312 $ 1,651,238 $ 1,176,927 $ 1,584,440 $ 910,281 $ 181,319 $ 450,408 $ 9,682,925 Allowance related to loans evaluated collectively $ 35,753 $ 11,760 $ 28,179 $ 16,320 $ 5,018 $ 656 $ 2,697 $ 100,383 Collective allowance to loans evaluated collectively ratio 0.96 % 0.71 % 2.39 % 1.03 % 0.55 % 0.36 % 0.60 % 1.04 % For the Year Ended December 31, 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 33,431 10,008 10,743 24,374 3,016 798 3,299 85,669 Charge-offs (411) — — (491) (484) — (433) (1,819) Recoveries 15 — — 702 105 6 184 1,012 Net recoveries (charge-offs) (396) — — 211 (379) 6 (249) (807) Balance at end of period $ 57,404 $ 20,061 $ 22,157 $ 46,806 $ 11,295 $ 1,502 $ 6,142 $ 165,367 Total loans $ 3,634,720 $ 1,642,216 $ 1,050,973 $ 2,267,548 $ 1,105,179 $ 182,619 $ 517,254 $ 10,400,509 Allowance for credit losses to total loans ratio 1.58 % 1.22 % 2.11 % 2.06 % 1.02 % 0.82 % 1.19 % 1.59 % Balance of loans individually evaluated for credit loss $ 45,227 $ 11,561 $ 15,044 $ 23,648 $ 1,874 $ — $ 364 $ 97,718 Allowance related to loans evaluated individually $ 1,273 $ — $ 603 $ 9,529 $ — $ — $ — $ 11,405 Individual allowance to loans evaluated individually ratio 2.81 % — % 4.01 % 40.30 % — % — % — % 11.67 % Balance of loans collectively evaluated for credit loss $ 3,589,493 $ 1,630,655 $ 1,035,929 $ 2,243,900 $ 1,103,305 $ 182,619 $ 516,890 $ 10,302,791 Allowance related to loans evaluated collectively $ 56,131 $ 20,061 $ 21,554 $ 37,277 $ 11,295 $ 1,502 $ 6,142 $ 153,962 Collective allowance to loans evaluated collectively ratio 1.56 % 1.23 % 2.08 % 1.66 % 1.02 % 0.82 % 1.19 % 1.49 %
Schedule Of Collateral Dependent Loans Individually Evaluated For Credit Loss With The Associated Allowances	The following tables present collateral dependent loans individually evaluated for credit loss with the associated allowances for credit losses by the applicable portfolio segment and for the periods indicated: September 30, 2021 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 $ 808 $ — $ 1,022 $ 6,760 $ — $ — $ — $ 8,590 Restructured accruing — — — 529 — — — 529 Restructured non-accruing 336 — — 1,137 — — — 1,473 Balance $ 1,144 $ — $ 1,022 $ 8,426 $ — $ — $ — $ 10,592 Allowance $ 203 $ — $ 509 $ 6,825 $ — $ — $ — $ 7,537 Loans individually evaluated for credit loss without an allowance: Non-accruing $ 4,731 $ 5,318 $ — $ 400 $ — $ — $ — $ 10,449 Restructured accruing — — — 105 1,565 — — 1,670 Restructured non-accruing 9,511 4,536 — 1,157 151 — 357 15,712 Balance $ 14,242 $ 9,854 $ — $ 1,662 $ 1,716 $ — $ 357 $ 27,831 Total individually evaluated loans: Non-accruing $ 5,539 $ 5,318 $ 1,022 $ 7,160 $ — $ — $ — $ 19,039 Restructured accruing — — — 634 1,565 — — 2,199 Restructured non-accruing 9,847 4,536 — 2,294 151 — 357 17,185 Balance $ 15,386 $ 9,854 $ 1,022 $ 10,088 $ 1,716 $ — $ 357 $ 38,423 Total unpaid contractual principal balance $ 24,990 $ 11,867 $ 1,090 $ 11,912 $ 2,792 $ — $ 364 $ 53,015 December 31, 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 $ 4,913 $ — $ 1,328 $ 11,178 $ — $ — $ — $ 17,419 Restructured accruing — — — 589 — — — 589 Restructured non-accruing 699 — — 2,010 — — — 2,709 Balance $ 5,612 $ — $ 1,328 $ 13,777 $ — $ — $ — $ 20,717 Allowance $ 1,273 $ — $ 603 $ 9,529 $ — $ — $ — $ 11,405 Loans individually evaluated for credit loss without an allowance: Non-accruing $ 39,615 $ 9,315 $ 13,716 $ 9,118 $ — $ — $ — $ 71,764 Restructured accruing — — — 126 1,602 — — 1,728 Restructured non-accruing — 2,246 — 627 272 — 364 3,509 Balance $ 39,615 $ 11,561 $ 13,716 $ 9,871 $ 1,874 $ — $ 364 $ 77,001 Total individually evaluated loans: Non-accruing $ 44,528 $ 9,315 $ 15,044 $ 20,296 $ — $ — $ — $ 89,183 Restructured accruing — — — 715 1,602 — — 2,317 Restructured non-accruing 699 2,246 — 2,637 272 — 364 6,218 Balance $ 45,227 $ 11,561 $ 15,044 $ 23,648 $ 1,874 $ — $ 364 $ 97,718 Total unpaid contractual principal balance $ 49,920 $ 15,309 $ 16,040 $ 30,958 $ 3,225 $ — $ 364 $ 115,816
Table Of Average Principal Balance Of The Total Non-Accrual Loans, Contractual Interest Due And Interest Income	The following tables present average principal balance of total non-accrual loans and contractual interest due on non-accrual loans for the periods indicated below: For the Nine Months Ended September 30, 2021 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Average non-accrual loans for the period $ 36,365 $ 9,479 $ 11,383 $ 13,742 $ 9,689 $ 31 $ 7,530 $ 88,219 Contractual interest income due on non- accrual loans during the period $ 1,825 $ 645 $ 565 $ 847 $ 312 $ 2 $ 320 $ 4,516 For the Year Ended December 31, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Average non-accrual loans for the period $ 26,849 $ 6,605 $ 4,267 $ 16,532 $ 11,634 $ — $ 6,675 $ 72,562 Contractual interest income due on non- accrual loans during the period $ 6,547 $ 2,741 $ 4,505 $ 2,858 $ 918 $ — $ 732 $ 18,301
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 for the periods indicated below: For the Nine Months Ended September 30, 2021 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 $ 45,227 $ 11,561 $ 15,044 $ 22,933 $ 10,212 $ — $ 7,384 $ 112,361 Loans placed on non-accrual 699 3,676 49 963 687 62 1,499 7,635 Non-accrual balances transferred to OREO — (257) — — — — — (257) Non-accrual balances charged-off (5,803) (136) (2,007) (2,793) — — (100) (10,839) Net payments or draws (24,737) (4,990) (12,064) (11,649) (1,328) — (676) (55,444) Non-accrual loans brought current — — — — (60) — (281) (341) Balance at end of period $ 15,386 $ 9,854 $ 1,022 $ 9,454 $ 9,511 $ 62 $ 7,826 $ 53,115 For the Year Ended December 31, 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 37,882 8,572 15,844 17,442 1,485 — 4,061 85,286 Non-accrual balances transferred to OREO — — — — (70) — — (70) Non-accrual balances charged-off (411) — — (446) (416) — (121) (1,394) Net payments or draws (10,225) (1,059) (1,629) (4,169) (2,598) — (1,521) (21,201) Non-accrual loans brought current — (100) — (883) (858) — (135) (1,976) Balance at end of period $ 45,227 $ 11,561 $ 15,044 $ 22,933 $ 10,212 $ — $ 7,384 $ 112,361 (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, 2021 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Performing loans: Current $ 3,692,293 $ 1,646,076 $ 1,169,583 $ 1,579,499 $ 888,345 $ 180,496 $ 436,972 $ 9,593,264 30-59 days 10,984 — — 4,461 11,501 761 4,574 32,281 60-89 days 10,205 5,162 — 480 396 — 1,393 17,636 Total performing loans 3,713,482 1,651,238 1,169,583 1,584,440 900,242 181,257 442,939 9,643,181 Non-performing loans: Non-accrual loans 15,386 9,854 1,022 9,454 9,511 62 7,826 53,115 Loans greater than 90 days past due 14,830 — 7,344 — 679 — — 22,853 Restructured loans — — — 634 1,565 — — 2,199 Total non-performing loans 30,216 9,854 8,366 10,088 11,755 62 7,826 78,167 Total loans $ 3,743,698 $ 1,661,092 $ 1,177,949 $ 1,594,528 $ 911,997 $ 181,319 $ 450,765 $ 9,721,348 December 31, 2020 Commercial Real Estate Residential Real Estate (In thousands) Commercial Commercial Commercial Commercial Residential Residential Consumer Total Performing loans: Current $ 3,571,184 $ 1,624,265 $ 1,033,057 $ 2,238,617 $ 1,073,963 $ 182,557 $ 502,548 $ 10,226,191 30-59 days 14,046 6,390 29 4,859 16,213 — 5,275 46,812 60-89 days 4,130 — 2,843 263 2,709 62 2,047 12,054 Total performing loans 3,589,360 1,630,655 1,035,929 2,243,739 1,092,885 182,619 509,870 10,285,057 Non-performing loans: Non-accrual loans 45,227 11,561 15,044 22,933 10,212 — 7,384 112,361 Loans greater than 90 days past due 133 — — 161 480 — — 774 Restructured loans — — — 715 1,602 — — 2,317 Total non-performing loans 45,360 11,561 15,044 23,809 12,294 — 7,384 115,452 Total loans $ 3,634,720 $ 1,642,216 $ 1,050,973 $ 2,267,548 $ 1,105,179 $ 182,619 $ 517,254 $ 10,400,509
Information About Credit Quality Indicator By The Year Of Origination	The following table provides information about credit quality indicators by the year of origination as of September 30, 2021: September 30, 2021 Term Loans by Origination Year Revolving (In thousands) 2021 2020 2019 2018 2017 Prior Loans Total Commercial Investor R/E: Pass $ 764,573 $ 782,273 $ 613,930 $ 408,936 $ 370,635 $ 723,877 $ 22,226 $ 3,686,450 Special Mention 2,283 4,980 4,276 602 684 6,924 — 19,749 Substandard 13,032 592 4,320 8,653 10,064 838 — 37,499 Doubtful — — — — — — — — Total $ 779,888 $ 787,845 $ 622,526 $ 418,191 $ 381,383 $ 731,639 $ 22,226 $ 3,743,698 Commercial Owner-Occupied R/E: Pass $ 267,459 $ 258,309 $ 326,143 $ 199,446 $ 174,397 $ 394,812 $ 4,755 $ 1,625,321 Special Mention 160 1,519 4,301 2,721 4,492 9,210 — 22,403 Substandard 1,237 2,585 4,134 2,280 359 2,773 — 13,368 Doubtful — — — — — — — — Total $ 268,856 $ 262,413 $ 334,578 $ 204,447 $ 179,248 $ 406,795 $ 4,755 $ 1,661,092 Commercial AD&C: Pass $ 373,212 $ 248,812 $ 240,404 $ 106,188 $ 28,985 $ — $ 169,051 $ 1,166,652 Special Mention 9,286 — — — — — 989 10,275 Substandard 49 390 577 — 6 — — 1,022 Doubtful — — — — — — — — Total $ 382,547 $ 249,202 $ 240,981 $ 106,188 $ 28,991 $ — $ 170,040 $ 1,177,949 Commercial Business: Pass $ 532,473 $ 245,034 $ 151,622 $ 110,341 $ 66,806 $ 61,688 $ 389,218 $ 1,557,182 Special Mention 109 2,247 7,634 1,711 673 554 8,094 21,022 Substandard 1,846 3,995 2,740 997 1,102 3,874 1,770 16,324 Doubtful — — — — — — — — Total $ 534,428 $ 251,276 $ 161,996 $ 113,049 $ 68,581 $ 66,116 $ 399,082 $ 1,594,528 Residential Mortgage: Beacon score: 660-850 $ 137,853 $ 170,633 $ 54,052 $ 81,896 $ 118,267 $ 255,214 $ — $ 817,915 600-659 9,209 4,443 4,375 7,036 4,063 23,653 — 52,779 540-599 499 1,379 1,822 4,737 2,469 10,596 — 21,502 less than 540 985 5,184 1,759 1,727 653 9,493 — 19,801 Total $ 148,546 $ 181,639 $ 62,008 $ 95,396 $ 125,452 $ 298,956 $ — $ 911,997 Residential Construction: Beacon score: 660-850 $ 95,213 $ 65,743 $ 9,013 $ 6,130 $ 1,248 $ 1,160 $ — $ 178,507 600-659 195 — 1,189 — — 396 — 1,780 540-599 — — — — — — — — less than 540 1,032 — — — — — — 1,032 Total $ 96,440 $ 65,743 $ 10,202 $ 6,130 $ 1,248 $ 1,556 $ — $ 181,319 Consumer: Beacon score: 660-850 $ 3,312 $ 1,441 $ 3,531 $ 3,632 $ 1,571 $ 29,118 $ 367,144 $ 409,749 600-659 220 196 329 591 481 5,278 14,135 21,230 540-599 104 15 241 186 161 2,563 6,165 9,435 less than 540 120 56 604 473 67 2,305 6,726 10,351 Total $ 3,756 $ 1,708 $ 4,705 $ 4,882 $ 2,280 $ 39,264 $ 394,170 $ 450,765 Total loans $ 2,214,461 $ 1,799,826 $ 1,436,996 $ 948,283 $ 787,183 $ 1,544,326 $ 990,273 $ 9,721,348 The following table provides information about credit quality indicators by the year of origination as of December 31, 2020: December 31, 2020 Term Loans by Origination Year Revolving (In thousands) 2020 2019 2018 2017 2016 Prior Loans Total Commercial Investor R/E: Pass $ 910,426 $ 763,214 $ 448,406 $ 448,698 $ 469,077 $ 498,384 $ 33,531 $ 3,571,736 Special Mention 11,044 — 4,879 833 269 27 — 17,052 Substandard 589 4,245 13,649 20,619 673 6,157 — 45,932 Doubtful — — — — — — — — Total $ 922,059 $ 767,459 $ 466,934 $ 470,150 $ 470,019 $ 504,568 $ 33,531 $ 3,634,720 Commercial Owner-Occupied R/E: Pass $ 285,310 $ 385,058 $ 234,578 $ 192,634 $ 204,925 $ 306,840 $ 1,664 $ 1,611,009 Special Mention 2,290 — 3,027 4,742 134 4,079 — 14,272 Substandard 1,610 4,335 2,065 465 219 8,009 — 16,703 Doubtful — — — — — 232 — 232 Total $ 289,210 $ 389,393 $ 239,670 $ 197,841 $ 205,278 $ 319,160 $ 1,664 $ 1,642,216 Commercial AD&C: Pass $ 485,631 $ 261,537 $ 149,703 $ 50,192 $ 89 $ 2,357 $ 80,764 $ 1,030,273 Special Mention 1,711 — — — — — — 1,711 Substandard 1,439 891 — 13,816 2,843 — — 18,989 Doubtful — — — — — — — — Total $ 488,781 $ 262,428 $ 149,703 $ 64,008 $ 2,932 $ 2,357 $ 80,764 $ 1,050,973 Commercial Business: Pass $ 1,244,822 $ 208,682 $ 138,861 $ 86,830 $ 34,498 $ 81,760 $ 433,016 $ 2,228,469 Special Mention 1,929 1,382 1,119 708 309 621 4,319 10,387 Substandard 2,914 4,564 3,519 1,631 2,745 3,456 1,829 20,658 Doubtful 106 995 849 36 1,284 1,852 2,912 8,034 Total $ 1,249,771 $ 215,623 $ 144,348 $ 89,205 $ 38,836 $ 87,689 $ 442,076 $ 2,267,548 Residential Mortgage: Beacon score: 660-850 $ 229,033 $ 74,054 $ 138,824 $ 172,493 $ 129,701 $ 251,065 $ — $ 995,170 600-659 4,824 7,706 10,763 11,719 8,173 21,424 — 64,609 540-599 350 1,238 5,219 2,608 4,791 10,167 — 24,373 less than 540 2,702 2,108 3,576 2,150 892 9,599 — 21,027 Total $ 236,909 $ 85,106 $ 158,382 $ 188,970 $ 143,557 $ 292,255 $ — $ 1,105,179 Residential Construction: Beacon score: 660-850 $ 112,604 $ 44,647 $ 14,543 $ 2,805 $ 1,693 $ — $ 172 $ 176,464 600-659 1,743 3,189 — — — — — 4,932 540-599 — — — — 369 — — 369 less than 540 854 — — — — — — 854 Total $ 115,201 $ 47,836 $ 14,543 $ 2,805 $ 2,062 $ — $ 172 $ 182,619 Consumer: Beacon score: 660-850 $ 2,575 $ 4,609 $ 5,112 $ 2,110 $ 2,614 $ 24,444 $ 417,737 $ 459,201 600-659 374 445 334 428 467 5,401 21,052 28,501 540-599 89 1,216 294 339 601 3,926 6,153 12,618 less than 540 751 160 525 785 532 2,826 11,355 16,934 Total $ 3,789 $ 6,430 $ 6,265 $ 3,662 $ 4,214 $ 36,597 $ 456,297 $ 517,254 Total loans $ 3,305,720 $ 1,774,275 $ 1,179,845 $ 1,016,641 $ 866,898 $ 1,242,626 $ 1,014,504 $ 10,400,509
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, 2021 Commercial Real Estate (In thousands) Commercial Commercial Commercial Commercial All Total Troubled debt restructurings: Restructured accruing $ — $ — $ — $ — $ — $ — Restructured non-accruing 9,594 3,157 — 726 — 13,477 Balance $ 9,594 $ 3,157 $ — $ 726 $ — $ 13,477 Individual allowance $ — $ — $ — $ 214 $ — $ 214 Restructured and subsequently defaulted $ — $ — $ — $ — $ — $ — For the Year Ended December 31, 2020 Commercial Real Estate (In thousands) Commercial Commercial Commercial Commercial All Total Troubled debt restructurings: Restructured accruing $ — $ — $ — $ 380 $ 549 $ 929 Restructured non-accruing 723 930 — 1,951 — 3,604 Balance $ 723 $ 930 $ — $ 2,331 $ 549 $ 4,533 Individual allowance $ 65 $ — $ — $ 955 $ — $ 1,020 Restructured and subsequently defaulted $ — $ — $ — $ — $ — $ —

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	9 Months Ended
	Sep. 30, 2021
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, 2021 Weighted December 31, 2020 Weighted (Dollars in thousands) Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets: Core deposit intangibles $ 29,038 $ (11,496) $ 17,542 7.7 years $ 29,038 $ (7,969) $ 21,069 8.4 years Other identifiable intangibles 13,906 (3,917) 9,989 10.0 years 13,906 (2,454) 11,452 10.7 years Total amortizing intangible assets $ 42,944 $ (15,413) $ 27,531 $ 42,944 $ (10,423) $ 32,521 Goodwill $ 370,223 $ 370,223 $ 370,223 $ 370,223
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 Balances at December 31, 2020 $ 331,688 $ 6,788 $ 31,747 $ 370,223 No Activity — — — — Balances at September 30, 2021 $ 331,688 $ 6,788 $ 31,747 $ 370,223
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 2021 $ 1,610 2022 5,844 2023 5,089 2024 4,333 2025 3,567 Thereafter 7,088 Total amortizing intangible assets $ 27,531

DEPOSITS (Tables)

DEPOSITS (Tables)	9 Months Ended
	Sep. 30, 2021
Deposits [Abstract]
Composition of Deposits	The following table presents the composition of deposits at the dates indicated: (In thousands) September 30, 2021 December 31, 2020 Noninterest-bearing deposits $ 3,987,411 $ 3,325,547 Interest-bearing deposits: Demand 1,399,060 1,292,164 Money market savings 3,595,643 3,339,645 Regular savings 496,432 418,051 Time deposits of less than $100,000 435,139 509,919 Time deposits greater than $100,000 and less than $250,000 643,414 670,717 Time deposits of $250,000 or more 430,301 477,026 Total interest-bearing deposits 6,999,989 6,707,522 Total deposits $ 10,987,400 $ 10,033,069

BORROWINGS (Tables)

BORROWINGS (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Schedule of Subordinated Borrowing	The following table provides information on subordinated debt as of the date indicated: (In thousands) September 30, 2021 December 31, 2020 Fixed to floating rate sub debt, 4.25% $ 175,000 $ 175,000 WashingtonFirst sub debt — 25,000 Revere fixed to floating rate sub debt — 31,000 Total Sub debt 175,000 231,000 Less: Debt held as investments by Sandy Spring — (3,000) Add: Purchase accounting premium — 1,669 Less: Debt issuance costs (2,361) (2,581) Long-term borrowings $ 172,639 $ 227,088

SHARE BASED COMPENSATION (Table

SHARE BASED COMPENSATION (Tables)	9 Months Ended
	Sep. 30, 2021
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 January 1, 2021 430,038 $ 14.97 3.0 years $ 6,828 Granted — $ — Exercised (193,602) $ 13.35 $ 5,356 Forfeited — $ — Expired — $ — Balance at September 30, 2021 236,436 $ 16.30 2.5 years $ 6,311 Exercisable at September 30, 2021 236,436 $ 16.30 2.5 years $ 6,311
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 January 1, 2021 391,683 $ 29.50 Granted 128,557 $ 41.05 Vested (119,228) $ 31.48 Forfeited/ cancelled (6,859) $ 34.33 Non-vested at September 30, 2021 394,153 $ 32.62

PENSION PLAN (Tables)

PENSION PLAN (Tables)	9 Months Ended
	Sep. 30, 2021
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) 2021 2020 2021 2020 Interest cost on projected benefit obligation $ 316 $ 359 $ 952 $ 1,078 Expected return on plan assets (312) (456) (936) (1,368) Recognized net actuarial loss 228 219 682 656 Net periodic benefit cost $ 232 $ 122 $ 698 $ 366

NET INCOME_ (LOSS) PER COMMON S

NET INCOME/ (LOSS) PER COMMON SHARE (Tables)	9 Months Ended
	Sep. 30, 2021
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) 2021 2020 2021 2020 Net income $ 56,976 $ 44,642 $ 189,703 $ 40,291 Distributed and undistributed earnings allocated to (354) (373) (1,219) (317) Net income attributable to common shareholders $ 56,622 $ 44,269 $ 188,484 $ 39,974 Total weighted average outstanding shares 47,197 47,415 47,409 43,261 Less: Weighted average participating securities (294) (397) (307) (355) Basic weighted average common shares 46,903 47,018 47,102 42,906 Dilutive weighted average common stock equivalents 184 157 213 165 Diluted weighted average common shares 47,087 47,175 47,315 43,071 Basic net income per common share $ 1.21 $ 0.94 $ 4.00 $ 0.93 Diluted net income per common share $ 1.20 $ 0.94 $ 3.98 $ 0.93 Anti-dilutive shares — 37 — 22

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	9 Months Ended
	Sep. 30, 2021
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, 2021 $ 28,175 $ (9,470) $ 18,705 Other comprehensive loss before reclassification, net of tax (20,218) — (20,218) Reclassifications from accumulated other comprehensive income, net of tax (133) 520 387 Current period change in other comprehensive income, net of tax (20,351) 520 (19,831) Balance at September 30, 2021 $ 7,824 $ (8,950) $ (1,126) (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
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) 2021 2020 Unrealized gains on investments available-for-sale: Affected line item in the Statements of Income: Investment securities gains $ 178 $ 432 Income before taxes 178 432 Tax expense (45) (110) Net income $ 133 $ 322 Amortization of defined benefit pension plan items: Affected line item in the Statements of Income: Recognized actuarial loss (1) $ (682) $ (656) Loss before taxes (682) (656) Tax benefit 162 159 Net loss $ (520) $ (497) (1) This amount is included in the computation of net periodic benefit cost. See Note 10 for additional information on the pension plan.

LEASES (Tables)

LEASES (Tables)	9 Months Ended
	Sep. 30, 2021
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, 2021 2020 2021 2020 Components of lease expense: Operating lease cost (resulting from lease payments) $ 3,047 $ 3,154 $ 9,333 $ 9,281 Supplemental cash flow information related to leases: Operating cash flows from operating leases $ 3,208 $ 4,158 $ 9,762 $ 10,160 ROU assets obtained in the exchange for lease liabilities due to: New leases $ — $ — $ 803 $ — Acquisitions $ — $ — $ — $ 7,720 September 30, 2021 December 31, 2020 Supplemental balance sheet information related to leases: Operating lease ROU assets $ 59,597 $ 65,215 Operating lease liabilities $ 69,060 $ 74,982 Other information related to leases: Weighted average remaining lease term of operating leases 9.1 years 9.5 years Weighted average discount rate of operating leases 2.92% 3.04%
Maturities of operating lease liabilities	At September 30, 2021, the maturities of the Company’s operating lease liabilities were as follows: (In thousands) Amount Maturity: Remaining 2021 $ 3,169 2022 11,368 2023 11,332 2024 9,423 2025 7,596 Thereafter 37,302 Total undiscounted lease payments 80,190 Less: Present value discount (11,130) Lease liability $ 69,060

FAIR VALUE (Tables)

FAIR VALUE (Tables)	9 Months Ended
	Sep. 30, 2021
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, 2021 Quoted Prices in Significant Other Significant (In thousands) (Level 1) (Level 2) (Level 3) Total Assets: Residential mortgage loans held for sale (1) $ — $ 44,678 $ — $ 44,678 Investments available-for-sale: U.S. treasuries and government agencies — 47,729 — 47,729 State and municipal — 327,793 — 327,793 Mortgage-backed and asset-backed — 1,046,624 — 1,046,624 Corporate debt — — 7,409 7,409 Total investments available-for-sale — 1,422,146 7,409 1,429,555 Interest rate swap agreements — 6,290 — 6,290 Total assets $ — $ 1,473,114 $ 7,409 $ 1,480,523 Liabilities: Interest rate swap agreements $ — $ (6,290) $ — $ (6,290) Total liabilities $ — $ (6,290) $ — $ (6,290) (1) The outstanding principal balance for residential loans held for sale as of September 30, 2021 was $43.5 million. December 31, 2020 Quoted Prices in Significant Other Significant (In thousands) (Level 1) (Level 2) (Level 3) Total Assets: Residential mortgage loans held for sale (1) $ — $ 78,294 $ — $ 78,294 Investments available-for-sale: U.S. treasuries and government agencies — 43,297 — 43,297 State and municipal — 390,367 — 390,367 Mortgage-backed and asset-backed — 904,432 — 904,432 Corporate debt — — 9,925 9,925 Total investments available-for-sale — 1,338,096 9,925 1,348,021 Interest rate swap agreements — 9,183 — 9,183 Total assets $ — $ 1,425,573 $ 9,925 $ 1,435,498 Liabilities: Interest rate swap agreements $ — $ (9,183) $ — $ (9,183) Total liabilities $ — $ (9,183) $ — $ (9,183) (1) The outstanding principal balance for residential loans held for sale as of December 31, 2020 was $75.5 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, 2021 $ 9,925 Additions of Level 3 assets — Sales of Level 3 assets (2,102) Total unrealized loss included in other comprehensive income/ (loss) (414) Balance at September 30, 2021 $ 7,409
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, 2021 (In thousands) Quoted Prices in Significant Significant Total Total Losses Loans (1) $ — $ — $ 721 $ 721 $ (6,771) Other real estate owned — — 1,105 1,105 (74) Total $ — $ — $ 1,826 $ 1,826 $ (6,845) (1) Amounts represent the fair value of collateral for collateral dependent non-accrual loans allocated to the allowance for credit losses. Fair values are determined using actual market prices (Level 2), independent third party valuations and borrower records, discounted as appropriate (Level 3). December 31, 2020 (In thousands) Quoted Prices in Significant Significant Total Total Losses Loans (1) $ — $ — $ 13,901 $ 13,901 $ (11,326) Other real estate owned — — 1,455 1,455 (286) Total $ — $ — $ 15,356 $ 15,356 $ (11,612) (1) Amounts represent the fair value of collateral for collateral dependent non-accrual loans allocated to the allowance for credit losses. Fair values are determined using actual market prices (Level 2), independent third party valuations and borrower records, discounted as appropriate (Level 3).
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, 2021 Quoted Prices in Significant Other Significant (In thousands) Carrying Estimated Financial assets: Cash and cash equivalents $ 1,114,633 $ 1,114,633 $ 1,114,633 $ — $ — Residential mortgage loans held for sale 44,678 44,678 — 44,678 — Investments available-for-sale 1,429,555 1,429,555 — 1,422,146 7,409 Equity securities 41,097 41,097 41,097 — — Loans, net of allowance 9,613,428 9,677,624 — — 9,677,624 Interest rate swap agreements 6,290 6,290 — 6,290 — Accrued interest receivable 36,219 36,219 36,219 — — Bank owned life insurance 146,710 146,710 — 146,710 — Financial liabilities: Time deposits $ 1,508,854 $ 1,515,231 $ — $ 1,515,231 $ — Other deposits 9,478,546 9,478,546 9,478,546 — — Securities sold under retail repurchase agreements and federal funds purchased 147,504 147,504 — 147,504 — Advances from FHLB — — — — — Subordinated debt 172,639 174,659 — — 174,659 Interest rate swap agreements 6,290 6,290 — 6,290 — Accrued interest payable 3,714 3,714 3,714 — — Fair Value Measurements December 31, 2020 Quoted Prices in Significant Other Significant (In thousands) Carrying Estimated Financial assets: Cash and cash equivalents $ 297,003 $ 297,003 $ 297,003 $ — $ — Residential mortgage loans held for sale 78,294 78,294 — 78,294 — Investments available-for-sale 1,348,021 1,348,021 — 1,338,096 9,925 Equity securities 65,760 65,760 65,760 — — Loans, net of allowance 10,235,142 10,336,355 — — 10,336,355 Interest rate swap agreements 9,183 9,183 — 9,183 — Accrued interest receivable 46,431 46,431 46,431 — — Bank owned life insurance 126,887 126,887 — 126,887 — Financial liabilities: Time deposits $ 1,657,662 $ 1,674,112 $ — $ 1,674,112 $ — Other deposits 8,375,407 8,375,407 8,375,407 — — Securities sold under retail repurchase agreements and federal funds purchased 543,157 543,157 — 543,157 — Advances from FHLB 379,075 390,593 — 390,593 — Subordinated debt 227,088 227,512 — — 227,512 Interest rate swap agreements 9,183 9,183 — 9,183 — Accrued interest payable 3,254 3,254 3,254 — —

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	9 Months Ended
	Sep. 30, 2021
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, 2021 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 111,129 $ — $ 3 $ (3) $ 111,129 Interest expense 4,528 — — (3) 4,525 Provision/ (credit) for credit losses (8,229) — — — (8,229) Non-interest income 16,644 2,282 5,685 (217) 24,394 Non-interest expense 58,059 1,696 3,643 (217) 63,181 Income/(loss) before income taxes 73,415 586 2,045 — 76,046 Income tax expense/ (benefit) 18,385 185 500 — 19,070 Net income/ (loss) $ 55,030 $ 401 $ 1,545 $ — $ 56,976 Assets $ 13,017,464 $ 9,203 $ 57,324 $ (66,527) $ 13,017,464 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/ (loss) before income taxes 57,369 540 1,025 — 58,934 Income tax expense/ (benefit) 13,912 149 231 — 14,292 Net income/ (loss) $ 43,457 $ 391 $ 794 $ — $ 44,642 Assets $ 12,678,396 $ 11,289 $ 57,088 $ (68,642) $ 12,678,131 Nine Months Ended September 30, 2021 (In thousands) Community Insurance Investment Inter-Segment Total Interest income $ 340,213 $ 2 $ 7 $ (9) $ 340,213 Interest expense 20,972 — — (9) 20,963 Provision/ (credit) for credit losses (47,141) — — — (47,141) Non-interest income 62,083 5,679 16,408 (4,651) 79,519 Non-interest expense 179,803 4,507 10,670 (651) 194,329 Income before income taxes 248,662 1,174 5,745 (4,000) 251,581 Income tax expense 59,951 347 1,580 — 61,878 Net income $ 188,711 $ 827 $ 4,165 $ (4,000) $ 189,703 Assets $ 13,017,464 $ 9,203 $ 57,324 $ (66,527) $ 13,017,464 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/ (loss) before income taxes 46,221 1,132 2,182 — 49,535 Income tax expense/ (benefit) 8,396 313 535 — 9,244 Net income/ (loss) $ 37,825 $ 819 $ 1,647 $ — $ 40,291 Assets $ 12,678,396 $ 11,289 $ 57,088 $ (68,642) $ 12,678,131

INVESTMENTS - Amortized Cost an

INVESTMENTS - Amortized Cost and Estimated Fair Values of Investments Available-for-sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale debt securities	$ 1,419,020	$ 1,310,159
Gross Unrealized Gains	18,867	38,922
Gross Unrealized Losses	(8,332)	(1,060)
Total available-for-sale debt securities	1,429,555	1,348,021
U.S. treasuries and government agencies
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale debt securities	47,477	42,750
Gross Unrealized Gains	260	549
Gross Unrealized Losses	(8)	(2)
Total available-for-sale debt securities	47,729	43,297
State and municipal
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale debt securities	325,384	377,108
Gross Unrealized Gains	5,486	13,470
Gross Unrealized Losses	(3,077)	(211)
Total available-for-sale debt securities	327,793	390,367
Mortgage-backed and asset-backed
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale debt securities	1,039,159	881,201
Gross Unrealized Gains	12,712	24,078
Gross Unrealized Losses	(5,247)	(847)
Total available-for-sale debt securities	1,046,624	904,432
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale debt securities	7,000	9,100
Gross Unrealized Gains	409	825
Gross Unrealized Losses	0	0
Total available-for-sale debt securities	$ 7,409	$ 9,925

INVESTMENTS - Narrative (Detail

INVESTMENTS - Narrative (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Separate Account Investment [Line Items]
Investments available-for-sale book value	$ 532.4	$ 465.7
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 Obligations
Fair Value, Separate Account Investment [Line Items]
Mortgage-backed securities	312.1
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	677.4
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	$ 57.1

INVESTMENTS - Gross Unrealized

INVESTMENTS - Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities (Detail) $ in Thousands	Sep. 30, 2021USD ($)security	Dec. 31, 2020USD ($)security
Debt Securities, Available-for-sale [Line Items]
Number of Securities | security	98	34
Fair Value
Less Than 12 Months	$ 547,099	$ 92,868
12 Months or More	30,247	76,879
Total	577,346	169,747
Unrealized Losses
Less Than 12 Months	6,966	367
12 Months or More	1,366	693
Total	$ 8,332	$ 1,060
U.S. treasuries and government agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities | security	2	2
Fair Value
Less Than 12 Months	$ 10,967	$ 25,369
12 Months or More	0	0
Total	10,967	25,369
Unrealized Losses
Less Than 12 Months	8	2
12 Months or More	0	0
Total	$ 8	$ 2
State and municipal
Debt Securities, Available-for-sale [Line Items]
Number of Securities | security	36	8
Fair Value
Less Than 12 Months	$ 90,013	$ 22,753
12 Months or More	14,643	0
Total	104,656	22,753
Unrealized Losses
Less Than 12 Months	2,169	211
12 Months or More	908	0
Total	$ 3,077	$ 211
Mortgage-backed and asset-backed
Debt Securities, Available-for-sale [Line Items]
Number of Securities | security	60	24
Fair Value
Less Than 12 Months	$ 446,119	$ 44,746
12 Months or More	15,604	76,879
Total	461,723	121,625
Unrealized Losses
Less Than 12 Months	4,789	154
12 Months or More	458	693
Total	$ 5,247	$ 847

INVESTMENTS - Estimated fair va

INVESTMENTS - Estimated fair values of debt securities available-for-sale by contractual maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value
Total available-for-sale debt securities	$ 1,429,555	$ 1,348,021
Amortized Cost
Total available-for-sale debt securities	1,419,020	1,310,159
U.S. treasuries and government agencies
Fair Value
One year or less	39,647	33,963
One to five years	8,082	9,334
Five to ten years	0	0
After ten years	0	0
Total available-for-sale debt securities	47,729	43,297
Amortized Cost
One year or less	39,559	33,833
One to five years	7,918	8,917
Five to ten years	0	0
After ten years	0	0
Total available-for-sale debt securities	47,477	42,750
State and municipal
Fair Value
One year or less	14,173	16,581
One to five years	25,081	44,910
Five to ten years	43,958	59,059
After ten years	244,581	269,817
Total available-for-sale debt securities	327,793	390,367
Amortized Cost
One year or less	14,009	16,458
One to five years	24,229	43,857
Five to ten years	43,207	56,130
After ten years	243,939	260,663
Total available-for-sale debt securities	325,384	377,108
Mortgage-backed and asset-backed
Fair Value
One year or less	7,975	1
One to five years	15,344	21,637
Five to ten years	319,947	74,142
After ten years	703,358	808,652
Total available-for-sale debt securities	1,046,624	904,432
Amortized Cost
One year or less	7,916	1
One to five years	15,063	21,229
Five to ten years	319,621	72,481
After ten years	696,559	787,490
Total available-for-sale debt securities	1,039,159	881,201
Corporate debt
Fair Value
One year or less	0	0
One to five years	0	2,318
Five to ten years	7,409	7,607
After ten years	0	0
Total available-for-sale debt securities	7,409	9,925
Amortized Cost
One year or less	0	0
One to five years	0	2,100
Five to ten years	7,000	7,000
After ten years	0	0
Total available-for-sale debt securities	$ 7,000	$ 9,100

INVESTMENTS (Other Equity Secur

INVESTMENTS (Other Equity Securities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Federal Home Loan Bank Stock and Federal Reserve Bank Stock [Abstract]
Federal Reserve Bank stock	$ 34,028	$ 38,650
Federal Home Loan Bank of Atlanta stock	6,392	26,433
Marketable equity securities	677	677
Total equity securities	$ 41,097	$ 65,760

LOANS - Narrative (Detail)

LOANS - Narrative (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Net deferred loan fees	$ 20	$ 24.5
Paycheck Protection Program
Loans and Leases Receivable Disclosure [Line Items]
Net deferred loan fees	$ 13	$ 21.2

LOANS (Loan Portfolio Segment B

LOANS (Loan Portfolio Segment Balances) (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 9,721,348	$ 10,400,509
Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,743,698	3,634,720
Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,661,092	1,642,216
Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,177,949	1,050,973
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	911,997	1,105,179
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	181,319	182,619
Commercial real estate: | Commercial investor real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,743,698	3,634,720
Commercial real estate: | Commercial owner-occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,661,092	1,642,216
Commercial real estate: | Commercial AD&C
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,177,949	1,050,973
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,177,267	8,595,457
Commercial | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,594,528	2,267,548
Residential real estate: | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	911,997	1,105,179
Residential real estate: | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	181,319	182,619
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	450,765	517,254
Total residential and consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,544,081	$ 1,805,052

CREDIT QUALITY ASSESSMENT - All

CREDIT QUALITY ASSESSMENT - Allowance for credit loss activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 165,367	$ 56,132	$ 56,132
Initial allowance on acquired Revere PCD loans			0	18,628	18,628
Provision/ (credit) for credit losses	$ (8,229)	$ 7,003	(47,141)	90,158	85,669
Loan charge-offs			(11,496)	(1,255)	(1,819)
Loan recoveries			1,190	906	1,012
Net charge-offs			(10,306)	(349)	(807)
Balance at period end	$ 107,920	$ 170,314	107,920	170,314	165,367
Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			0	2,762	2,762
Balance at period end					0
Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 0	$ 2,983	2,983
Balance at period end					$ 0

CREDIT QUALITY ASSESSMENT - Col

CREDIT QUALITY ASSESSMENT - Collateral Dependent Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Credit Loss [Abstract]
Collateral dependent loans individually evaluated for credit loss with an allowance	$ 10,592	$ 20,717
Collateral dependent loans individually evaluated for credit loss without an allowance	27,831	77,001
Total individually evaluated collateral dependent loans	38,423	97,718
Allowance for credit losses related to loans evaluated individually	7,537	11,405
Allowance for credit losses related to loans evaluated collectively	100,383	153,962
Total allowance for credit losses	$ 107,920	$ 165,367	$ 170,314	$ 56,132

CREDIT QUALITY ASSESSMENT - A_2

CREDIT QUALITY ASSESSMENT - Allowance for Credit or Loan Losses by Respective Loan Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 165,367	$ 56,132	$ 56,132
Initial allowance on acquired Revere PCD loans			0	18,628	18,628
Provision/ (credit) for credit losses	$ (8,229)	$ 7,003	(47,141)	90,158	85,669
Charge-offs			(11,496)	(1,255)	(1,819)
Recoveries			1,190	906	1,012
Net recoveries (charge-offs)			(10,306)	(349)	(807)
Balance at period end	107,920	$ 170,314	107,920	170,314	165,367
Total loans	$ 9,721,348		$ 9,721,348		$ 10,400,509
Allowance for credit losses to total loans ratio	1.11%		1.11%		1.59%
Balance of loans individually evaluated for credit loss	$ 38,423		$ 38,423		$ 97,718
Allowance related to loans evaluated individually	$ 7,537		$ 7,537		$ 11,405
Individual allowance to loans evaluated individually ratio	19.62%		19.62%		11.67%
Balance of loans collectively evaluated for credit loss	$ 9,682,925		$ 9,682,925		$ 10,302,791
Allowance related to loans evaluated collectively	$ 100,383		$ 100,383		$ 153,962
Collective allowance to loans evaluated collectively ratio	1.04%		1.04%		1.49%
Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 0	2,762	$ 2,762
Balance at period end					0
Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			0	2,983	2,983
Balance at period end					0
Commercial investor real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Total loans	$ 3,743,698		3,743,698		3,634,720
Commercial owner-occupied real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Total loans	1,661,092		1,661,092		1,642,216
Commercial AD&C
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Total loans	1,177,949		1,177,949		1,050,973
Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Total loans	911,997		911,997		1,105,179
Residential construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Total loans	181,319		181,319		182,619
Commercial real estate: | Commercial investor real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			57,404	18,407	18,407
Initial allowance on acquired Revere PCD loans					7,973
Provision/ (credit) for credit losses			(15,822)		33,431
Charge-offs			(5,802)		(411)
Recoveries			176		15
Net recoveries (charge-offs)			(5,626)		(396)
Balance at period end	35,956		35,956		57,404
Total loans	$ 3,743,698		$ 3,743,698		$ 3,634,720
Allowance for credit losses to total loans ratio	0.96%		0.96%		1.58%
Balance of loans individually evaluated for credit loss	$ 15,386		$ 15,386		$ 45,227
Allowance related to loans evaluated individually	$ 203		$ 203		$ 1,273
Individual allowance to loans evaluated individually ratio	1.32%		1.32%		2.81%
Balance of loans collectively evaluated for credit loss	$ 3,728,312		$ 3,728,312		$ 3,589,493
Allowance related to loans evaluated collectively	$ 35,753		$ 35,753		$ 56,131
Collective allowance to loans evaluated collectively ratio	0.96%		0.96%		1.56%
Commercial real estate: | Commercial investor real estate | Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				1,114	$ 1,114
Commercial real estate: | Commercial investor real estate | Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				(3,125)	(3,125)
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 20,061	6,884	6,884
Initial allowance on acquired Revere PCD loans					2,782
Provision/ (credit) for credit losses			(8,165)		10,008
Charge-offs			(136)		0
Recoveries			0		0
Net recoveries (charge-offs)			(136)		0
Balance at period end	$ 11,760		11,760		20,061
Total loans	$ 1,661,092		$ 1,661,092		$ 1,642,216
Allowance for credit losses to total loans ratio	0.71%		0.71%		1.22%
Balance of loans individually evaluated for credit loss	$ 9,854		$ 9,854		$ 11,561
Allowance related to loans evaluated individually	$ 0		$ 0		$ 0
Individual allowance to loans evaluated individually ratio	0.00%		0.00%		0.00%
Balance of loans collectively evaluated for credit loss	$ 1,651,238		$ 1,651,238		$ 1,630,655
Allowance related to loans evaluated collectively	$ 11,760		$ 11,760		$ 20,061
Collective allowance to loans evaluated collectively ratio	0.71%		0.71%		1.23%
Commercial real estate: | Commercial owner-occupied real estate | Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				0	$ 0
Commercial real estate: | Commercial owner-occupied real estate | Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				387	387
Commercial real estate: | Commercial AD&C
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 22,157	7,590	7,590
Initial allowance on acquired Revere PCD loans					1,248
Provision/ (credit) for credit losses			8,538		10,743
Charge-offs			(2,007)		0
Recoveries			0		0
Net recoveries (charge-offs)			(2,007)		0
Balance at period end	$ 28,688		28,688		22,157
Total loans	$ 1,177,949		$ 1,177,949		$ 1,050,973
Allowance for credit losses to total loans ratio	2.44%		2.44%		2.11%
Balance of loans individually evaluated for credit loss	$ 1,022		$ 1,022		$ 15,044
Allowance related to loans evaluated individually	$ 509		$ 509		$ 603
Individual allowance to loans evaluated individually ratio	49.80%		49.80%		4.01%
Balance of loans collectively evaluated for credit loss	$ 1,176,927		$ 1,176,927		$ 1,035,929
Allowance related to loans evaluated collectively	$ 28,179		$ 28,179		$ 21,554
Collective allowance to loans evaluated collectively ratio	2.39%		2.39%		2.08%
Commercial real estate: | Commercial AD&C | Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				0	$ 0
Commercial real estate: | Commercial AD&C | Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				2,576	2,576
Commercial Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Total loans	$ 8,177,267		$ 8,177,267		8,595,457
Balance of loans individually evaluated for credit loss	10,088		10,088		23,648
Allowance related to loans evaluated individually	6,825		6,825		9,529
Commercial Business | Commercial business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			46,806	11,395	11,395
Initial allowance on acquired Revere PCD loans					6,289
Provision/ (credit) for credit losses			(20,721)		24,374
Charge-offs			(3,315)		(491)
Recoveries			375		702
Net recoveries (charge-offs)			(2,940)		211
Balance at period end	23,145		23,145		46,806
Total loans	$ 1,594,528		$ 1,594,528		$ 2,267,548
Allowance for credit losses to total loans ratio	1.45%		1.45%		2.06%
Balance of loans individually evaluated for credit loss	$ 10,088		$ 10,088		$ 23,648
Allowance related to loans evaluated individually	$ 6,825		$ 6,825		$ 9,529
Individual allowance to loans evaluated individually ratio	67.65%		67.65%		40.30%
Balance of loans collectively evaluated for credit loss	$ 1,584,440		$ 1,584,440		$ 2,243,900
Allowance related to loans evaluated collectively	$ 16,320		$ 16,320		$ 37,277
Collective allowance to loans evaluated collectively ratio	1.03%		1.03%		1.66%
Commercial Business | Commercial business | Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				1,549	$ 1,549
Commercial Business | Commercial business | Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				2,988	2,988
Residential real estate: | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 11,295	8,803	8,803
Initial allowance on acquired Revere PCD loans					243
Provision/ (credit) for credit losses			(6,607)		3,016
Charge-offs			0		(484)
Recoveries			330		105
Net recoveries (charge-offs)			330		(379)
Balance at period end	$ 5,018		5,018		11,295
Total loans	$ 911,997		$ 911,997		$ 1,105,179
Allowance for credit losses to total loans ratio	0.55%		0.55%		1.02%
Balance of loans individually evaluated for credit loss	$ 1,716		$ 1,716		$ 1,874
Allowance related to loans evaluated individually	$ 0		$ 0		$ 0
Individual allowance to loans evaluated individually ratio	0.00%		0.00%		0.00%
Balance of loans collectively evaluated for credit loss	$ 910,281		$ 910,281		$ 1,103,305
Allowance related to loans evaluated collectively	$ 5,018		$ 5,018		$ 11,295
Collective allowance to loans evaluated collectively ratio	0.55%		0.55%		1.02%
Residential real estate: | Residential mortgage | Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				0	$ 0
Residential real estate: | Residential mortgage | Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				(388)	(388)
Residential real estate: | Residential construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 1,502	967	967
Initial allowance on acquired Revere PCD loans					6
Provision/ (credit) for credit losses			(849)		798
Charge-offs			0		0
Recoveries			3		6
Net recoveries (charge-offs)			3		6
Balance at period end	$ 656		656		1,502
Total loans	$ 181,319		$ 181,319		$ 182,619
Allowance for credit losses to total loans ratio	0.36%		0.36%		0.82%
Balance of loans individually evaluated for credit loss	$ 0		$ 0		$ 0
Allowance related to loans evaluated individually	$ 0		$ 0		$ 0
Individual allowance to loans evaluated individually ratio	0.00%		0.00%		0.00%
Balance of loans collectively evaluated for credit loss	$ 181,319		$ 181,319		$ 182,619
Allowance related to loans evaluated collectively	$ 656		$ 656		$ 1,502
Collective allowance to loans evaluated collectively ratio	0.36%		0.36%		0.82%
Residential real estate: | Residential construction | Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				0	$ 0
Residential real estate: | Residential construction | Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				(275)	(275)
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 6,142	2,086	2,086
Initial allowance on acquired Revere PCD loans					87
Provision/ (credit) for credit losses			(3,515)		3,299
Charge-offs			(236)		(433)
Recoveries			306		184
Net recoveries (charge-offs)			70		(249)
Balance at period end	$ 2,697		2,697		6,142
Total loans	$ 450,765		$ 450,765		$ 517,254
Allowance for credit losses to total loans ratio	0.60%		0.60%		1.19%
Balance of loans individually evaluated for credit loss	$ 357		$ 357		$ 364
Allowance related to loans evaluated individually	$ 0		$ 0		$ 0
Individual allowance to loans evaluated individually ratio	0.00%		0.00%		0.00%
Balance of loans collectively evaluated for credit loss	$ 450,408		$ 450,408		$ 516,890
Allowance related to loans evaluated collectively	$ 2,697		$ 2,697		$ 6,142
Collective allowance to loans evaluated collectively ratio	0.60%		0.60%		1.19%
Consumer | Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				99	$ 99
Consumer | Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 820	$ 820

CREDIT QUALITY ASSESSMENT - C_2

CREDIT QUALITY ASSESSMENT - Collateral dependent loans individually evaluated for credit loss (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	$ 10,592	$ 20,717
Allowance related to loans evaluated individually	7,537	11,405
Loans individually evaluated for credit loss without an allowance	27,831	77,001
Total individually evaluated collateral dependent loans	38,423	97,718
Total unpaid contractual principal balance	53,015	115,816
Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	8,590	17,419
Loans individually evaluated for credit loss without an allowance	10,449	71,764
Total individually evaluated collateral dependent loans	19,039	89,183
Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	1,473	2,709
Loans individually evaluated for credit loss without an allowance	15,712	3,509
Total individually evaluated collateral dependent loans	17,185	6,218
Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	529	589
Loans individually evaluated for credit loss without an allowance	1,670	1,728
Total individually evaluated collateral dependent loans	2,199	2,317
Commercial real estate: | Commercial investor real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	1,144	5,612
Allowance related to loans evaluated individually	203	1,273
Loans individually evaluated for credit loss without an allowance	14,242	39,615
Total individually evaluated collateral dependent loans	15,386	45,227
Total unpaid contractual principal balance	24,990	49,920
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	808	4,913
Loans individually evaluated for credit loss without an allowance	4,731	39,615
Total individually evaluated collateral dependent loans	5,539	44,528
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	336	699
Loans individually evaluated for credit loss without an allowance	9,511	0
Total individually evaluated collateral dependent loans	9,847	699
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	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	0	0
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	0	0
Allowance related to loans evaluated individually	0	0
Loans individually evaluated for credit loss without an allowance	9,854	11,561
Total individually evaluated collateral dependent loans	9,854	11,561
Total unpaid contractual principal balance	11,867	15,309
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	0
Loans individually evaluated for credit loss without an allowance	5,318	9,315
Total individually evaluated collateral dependent loans	5,318	9,315
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	0	0
Loans individually evaluated for credit loss without an allowance	4,536	2,246
Total individually evaluated collateral dependent loans	4,536	2,246
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	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	0	0
Commercial real estate: | Commercial AD&C
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	1,022	1,328
Allowance related to loans evaluated individually	509	603
Loans individually evaluated for credit loss without an allowance	0	13,716
Total individually evaluated collateral dependent loans	1,022	15,044
Total unpaid contractual principal balance	1,090	16,040
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	1,022	1,328
Loans individually evaluated for credit loss without an allowance	0	13,716
Total individually evaluated collateral dependent loans	1,022	15,044
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	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	0	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	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	0	0
Commercial Business
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	8,426	13,777
Allowance related to loans evaluated individually	6,825	9,529
Loans individually evaluated for credit loss without an allowance	1,662	9,871
Total individually evaluated collateral dependent loans	10,088	23,648
Total unpaid contractual principal balance	11,912	30,958
Commercial Business | Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	6,760	11,178
Loans individually evaluated for credit loss without an allowance	400	9,118
Total individually evaluated collateral dependent loans	7,160	20,296
Commercial Business | Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	1,137	2,010
Loans individually evaluated for credit loss without an allowance	1,157	627
Total individually evaluated collateral dependent loans	2,294	2,637
Commercial Business | Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	529	589
Loans individually evaluated for credit loss without an allowance	105	126
Total individually evaluated collateral dependent loans	634	715
Residential real estate: | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0	0
Allowance related to loans evaluated individually	0	0
Loans individually evaluated for credit loss without an allowance	1,716	1,874
Total individually evaluated collateral dependent loans	1,716	1,874
Total unpaid contractual principal balance	2,792	3,225
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	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	0	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	0
Loans individually evaluated for credit loss without an allowance	151	272
Total individually evaluated collateral dependent loans	151	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	0
Loans individually evaluated for credit loss without an allowance	1,565	1,602
Total individually evaluated collateral dependent loans	1,565	1,602
Residential real estate: | Residential construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0	0
Allowance related to loans evaluated individually	0	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	0	0
Total unpaid contractual principal balance	0	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	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	0	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	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	0	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	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	0	0
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0	0
Allowance related to loans evaluated individually	0	0
Loans individually evaluated for credit loss without an allowance	357	364
Total individually evaluated collateral dependent loans	357	364
Total unpaid contractual principal balance	364	364
Consumer | Non-accruing
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	0	0
Consumer | Non-accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0	0
Loans individually evaluated for credit loss without an allowance	357	364
Total individually evaluated collateral dependent loans	357	364
Consumer | Accruing | Restructured
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for credit loss with an allowance	0	0
Loans individually evaluated for credit loss without an allowance	0	0
Total individually evaluated collateral dependent loans	$ 0	$ 0

CREDIT QUALITY ASSESSMENT - Non

CREDIT QUALITY ASSESSMENT - Non-accrual Loans (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	$ 88,219	$ 72,562
Contractual interest income due on non- accrual loans during the period	4,516	18,301
Commercial real estate: | Commercial investor real estate
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	36,365	26,849
Contractual interest income due on non- accrual loans during the period	1,825	6,547
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	9,479	6,605
Contractual interest income due on non- accrual loans during the period	645	2,741
Commercial real estate: | Commercial AD&C
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	11,383	4,267
Contractual interest income due on non- accrual loans during the period	565	4,505
Commercial Business
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	13,742	16,532
Contractual interest income due on non- accrual loans during the period	847	2,858
Residential real estate: | Residential mortgage
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	9,689	11,634
Contractual interest income due on non- accrual loans during the period	312	918
Residential real estate: | Residential construction
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	31	0
Contractual interest income due on non- accrual loans during the period	2	0
Consumer
Financing Receivable, Nonaccrual [Line Items]
Average non-accrual loans for the period	7,530	6,675
Contractual interest income due on non- accrual loans during the period	$ 320	$ 732

CREDIT QUALITY ASSESSMENT - Nar

CREDIT QUALITY ASSESSMENT - Narrative (Detail) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period increase (decrease)	$ 0	$ 0
Other real estate owned		1,105	$ 1,455
Reversal of uncollected accrued interest		100
Non-accrual status
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans placed on non-accrual		7,635	85,286
Restructured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans restructured during the period		13,500	4,500
Individual reserves		200	1,000
Other real estate owned		$ 1,100	$ 1,500

CREDIT QUALITY ASSESSMENT - Inf

CREDIT QUALITY ASSESSMENT - Information on the credit quality of loan portfolio under the new CECL (Detail) - Non-accrual status - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 112,361	$ 38,632
PCD loans designed as non-accrual		13,084
Loans placed on non-accrual	7,635	85,286
Non-accrual balances transferred to OREO	(257)	(70)
Non-accrual balances charged-off	(10,839)	(1,394)
Net payments or draws	(55,444)	(21,201)
Non-accrual loans brought current	(341)	(1,976)
Balance at end of period	53,115	112,361
Commercial real estate: | Commercial investor real estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	45,227	8,437
PCD loans designed as non-accrual		9,544
Loans placed on non-accrual	699	37,882
Non-accrual balances transferred to OREO	0	0
Non-accrual balances charged-off	(5,803)	(411)
Net payments or draws	(24,737)	(10,225)
Non-accrual loans brought current	0	0
Balance at end of period	15,386	45,227
Commercial real estate: | Commercial owner-occupied real estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	11,561	4,148
PCD loans designed as non-accrual		0
Loans placed on non-accrual	3,676	8,572
Non-accrual balances transferred to OREO	(257)	0
Non-accrual balances charged-off	(136)	0
Net payments or draws	(4,990)	(1,059)
Non-accrual loans brought current	0	(100)
Balance at end of period	9,854	11,561
Commercial real estate: | Commercial AD&C
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	15,044	829
PCD loans designed as non-accrual		0
Loans placed on non-accrual	49	15,844
Non-accrual balances transferred to OREO	0	0
Non-accrual balances charged-off	(2,007)	0
Net payments or draws	(12,064)	(1,629)
Non-accrual loans brought current	0	0
Balance at end of period	1,022	15,044
Commercial Business
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	22,933	8,450
PCD loans designed as non-accrual		2,539
Loans placed on non-accrual	963	17,442
Non-accrual balances transferred to OREO	0	0
Non-accrual balances charged-off	(2,793)	(446)
Net payments or draws	(11,649)	(4,169)
Non-accrual loans brought current	0	(883)
Balance at end of period	9,454	22,933
Residential real estate: | Residential mortgage
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	10,212	12,661
PCD loans designed as non-accrual		8
Loans placed on non-accrual	687	1,485
Non-accrual balances transferred to OREO	0	(70)
Non-accrual balances charged-off	0	(416)
Net payments or draws	(1,328)	(2,598)
Non-accrual loans brought current	(60)	(858)
Balance at end of period	9,511	10,212
Residential real estate: | Residential construction
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	0	0
PCD loans designed as non-accrual		0
Loans placed on non-accrual	62	0
Non-accrual balances transferred to OREO	0	0
Non-accrual balances charged-off	0	0
Net payments or draws	0	0
Non-accrual loans brought current	0	0
Balance at end of period	62	0
Consumer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	7,384	4,107
PCD loans designed as non-accrual		993
Loans placed on non-accrual	1,499	4,061
Non-accrual balances transferred to OREO	0	0
Non-accrual balances charged-off	(100)	(121)
Net payments or draws	(676)	(1,521)
Non-accrual loans brought current	(281)	(135)
Balance at end of period	$ 7,826	$ 7,384

CREDIT QUALITY ASSESSMENT - Cre

CREDIT QUALITY ASSESSMENT - Credit Quality of Loan Portfolio, New (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total loans	$ 9,721,348	$ 10,400,509
Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	9,643,181	10,285,057
Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	53,115	112,361
Loans greater than 90 days past due	22,853	774
Restructured loans	2,199	2,317
Total non-performing loans	78,167	115,452
Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	9,593,264	10,226,191
30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	32,281	46,812
60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	17,636	12,054
Commercial investor real estate
Financing Receivable, Past Due [Line Items]
Total loans	3,743,698	3,634,720
Commercial owner-occupied real estate
Financing Receivable, Past Due [Line Items]
Total loans	1,661,092	1,642,216
Commercial AD&C
Financing Receivable, Past Due [Line Items]
Total loans	1,177,949	1,050,973
Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans	911,997	1,105,179
Residential construction
Financing Receivable, Past Due [Line Items]
Total loans	181,319	182,619
Commercial real estate: | Commercial investor real estate
Financing Receivable, Past Due [Line Items]
Total loans	3,743,698	3,634,720
Commercial real estate: | Commercial investor real estate | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	3,713,482	3,589,360
Commercial real estate: | Commercial investor real estate | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	15,386	45,227
Loans greater than 90 days past due	14,830	133
Restructured loans	0	0
Total non-performing loans	30,216	45,360
Commercial real estate: | Commercial investor real estate | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	3,692,293	3,571,184
Commercial real estate: | Commercial investor real estate | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	10,984	14,046
Commercial real estate: | Commercial investor real estate | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	10,205	4,130
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Past Due [Line Items]
Total loans	1,661,092	1,642,216
Commercial real estate: | Commercial owner-occupied real estate | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,651,238	1,630,655
Commercial real estate: | Commercial owner-occupied real estate | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	9,854	11,561
Loans greater than 90 days past due	0	0
Restructured loans	0	0
Total non-performing loans	9,854	11,561
Commercial real estate: | Commercial owner-occupied real estate | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,646,076	1,624,265
Commercial real estate: | Commercial owner-occupied real estate | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	0	6,390
Commercial real estate: | Commercial owner-occupied real estate | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	5,162	0
Commercial real estate: | Commercial AD&C
Financing Receivable, Past Due [Line Items]
Total loans	1,177,949	1,050,973
Commercial real estate: | Commercial AD&C | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,169,583	1,035,929
Commercial real estate: | Commercial AD&C | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	1,022	15,044
Loans greater than 90 days past due	7,344	0
Restructured loans	0	0
Total non-performing loans	8,366	15,044
Commercial real estate: | Commercial AD&C | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,169,583	1,033,057
Commercial real estate: | Commercial AD&C | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	0	29
Commercial real estate: | Commercial AD&C | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	0	2,843
Commercial Business
Financing Receivable, Past Due [Line Items]
Total loans	8,177,267	8,595,457
Commercial Business | Commercial business
Financing Receivable, Past Due [Line Items]
Total loans	1,594,528	2,267,548
Commercial Business | Commercial business | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,584,440	2,243,739
Commercial Business | Commercial business | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	9,454	22,933
Loans greater than 90 days past due	0	161
Restructured loans	634	715
Total non-performing loans	10,088	23,809
Commercial Business | Commercial business | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,579,499	2,238,617
Commercial Business | Commercial business | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	4,461	4,859
Commercial Business | Commercial business | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	480	263
Residential real estate: | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans	911,997	1,105,179
Residential real estate: | Residential mortgage | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	900,242	1,092,885
Residential real estate: | Residential mortgage | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	9,511	10,212
Loans greater than 90 days past due	679	480
Restructured loans	1,565	1,602
Total non-performing loans	11,755	12,294
Residential real estate: | Residential mortgage | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	888,345	1,073,963
Residential real estate: | Residential mortgage | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	11,501	16,213
Residential real estate: | Residential mortgage | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	396	2,709
Residential real estate: | Residential construction
Financing Receivable, Past Due [Line Items]
Total loans	181,319	182,619
Residential real estate: | Residential construction | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	181,257	182,619
Residential real estate: | Residential construction | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	62	0
Loans greater than 90 days past due	0	0
Restructured loans	0	0
Total non-performing loans	62	0
Residential real estate: | Residential construction | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	180,496	182,557
Residential real estate: | Residential construction | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	761	0
Residential real estate: | Residential construction | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	0	62
Consumer
Financing Receivable, Past Due [Line Items]
Total loans	450,765	517,254
Consumer | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	442,939	509,870
Consumer | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	7,826	7,384
Loans greater than 90 days past due	0	0
Restructured loans	0	0
Total non-performing loans	7,826	7,384
Consumer | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	436,972	502,548
Consumer | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	4,574	5,275
Consumer | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	$ 1,393	$ 2,047

CREDIT QUALITY ASSESSMENT - I_2

CREDIT QUALITY ASSESSMENT - Information about credit quality indicator by year of origination (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	$ 2,214,461	$ 3,305,720
Year two	1,799,826	1,774,275
Year three	1,436,996	1,179,845
Year four	948,283	1,016,641
Year five	787,183	866,898
Prior	1,544,326	1,242,626
Revolving Loans	990,273	1,014,504
Total	9,721,348	10,400,509
Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	779,888	922,059
Year two	787,845	767,459
Year three	622,526	466,934
Year four	418,191	470,150
Year five	381,383	470,019
Prior	731,639	504,568
Revolving Loans	22,226	33,531
Total	3,743,698	3,634,720
Commercial investor real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	764,573	910,426
Year two	782,273	763,214
Year three	613,930	448,406
Year four	408,936	448,698
Year five	370,635	469,077
Prior	723,877	498,384
Revolving Loans	22,226	33,531
Total	3,686,450	3,571,736
Commercial investor real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,283	11,044
Year two	4,980	0
Year three	4,276	4,879
Year four	602	833
Year five	684	269
Prior	6,924	27
Revolving Loans	0	0
Total	19,749	17,052
Commercial investor real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	13,032	589
Year two	592	4,245
Year three	4,320	13,649
Year four	8,653	20,619
Year five	10,064	673
Prior	838	6,157
Revolving Loans	0	0
Total	37,499	45,932
Commercial investor real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	268,856	289,210
Year two	262,413	389,393
Year three	334,578	239,670
Year four	204,447	197,841
Year five	179,248	205,278
Prior	406,795	319,160
Revolving Loans	4,755	1,664
Total	1,661,092	1,642,216
Commercial owner-occupied real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	267,459	285,310
Year two	258,309	385,058
Year three	326,143	234,578
Year four	199,446	192,634
Year five	174,397	204,925
Prior	394,812	306,840
Revolving Loans	4,755	1,664
Total	1,625,321	1,611,009
Commercial owner-occupied real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	160	2,290
Year two	1,519	0
Year three	4,301	3,027
Year four	2,721	4,742
Year five	4,492	134
Prior	9,210	4,079
Revolving Loans	0	0
Total	22,403	14,272
Commercial owner-occupied real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,237	1,610
Year two	2,585	4,335
Year three	4,134	2,065
Year four	2,280	465
Year five	359	219
Prior	2,773	8,009
Revolving Loans	0	0
Total	13,368	16,703
Commercial owner-occupied real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	232
Revolving Loans	0	0
Total	0	232
Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	382,547	488,781
Year two	249,202	262,428
Year three	240,981	149,703
Year four	106,188	64,008
Year five	28,991	2,932
Prior	0	2,357
Revolving Loans	170,040	80,764
Total	1,177,949	1,050,973
Commercial AD&C | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	373,212	485,631
Year two	248,812	261,537
Year three	240,404	149,703
Year four	106,188	50,192
Year five	28,985	89
Prior	0	2,357
Revolving Loans	169,051	80,764
Total	1,166,652	1,030,273
Commercial AD&C | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	9,286	1,711
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans	989	0
Total	10,275	1,711
Commercial AD&C | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	49	1,439
Year two	390	891
Year three	577	0
Year four	0	13,816
Year five	6	2,843
Prior	0	0
Revolving Loans	0	0
Total	1,022	18,989
Commercial AD&C | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	148,546	236,909
Year two	181,639	85,106
Year three	62,008	158,382
Year four	95,396	188,970
Year five	125,452	143,557
Prior	298,956	292,255
Revolving Loans	0	0
Total	911,997	1,105,179
Residential mortgage | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	137,853	229,033
Year two	170,633	74,054
Year three	54,052	138,824
Year four	81,896	172,493
Year five	118,267	129,701
Prior	255,214	251,065
Revolving Loans	0	0
Total	817,915	995,170
Residential mortgage | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	9,209	4,824
Year two	4,443	7,706
Year three	4,375	10,763
Year four	7,036	11,719
Year five	4,063	8,173
Prior	23,653	21,424
Revolving Loans	0	0
Total	52,779	64,609
Residential mortgage | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	499	350
Year two	1,379	1,238
Year three	1,822	5,219
Year four	4,737	2,608
Year five	2,469	4,791
Prior	10,596	10,167
Revolving Loans	0	0
Total	21,502	24,373
Residential mortgage | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	985	2,702
Year two	5,184	2,108
Year three	1,759	3,576
Year four	1,727	2,150
Year five	653	892
Prior	9,493	9,599
Revolving Loans	0	0
Total	19,801	21,027
Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	96,440	115,201
Year two	65,743	47,836
Year three	10,202	14,543
Year four	6,130	2,805
Year five	1,248	2,062
Prior	1,556	0
Revolving Loans	0	172
Total	181,319	182,619
Residential construction | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	95,213	112,604
Year two	65,743	44,647
Year three	9,013	14,543
Year four	6,130	2,805
Year five	1,248	1,693
Prior	1,160	0
Revolving Loans	0	172
Total	178,507	176,464
Residential construction | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	195	1,743
Year two	0	3,189
Year three	1,189	0
Year four	0	0
Year five	0	0
Prior	396	0
Revolving Loans	0	0
Total	1,780	4,932
Residential construction | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	369
Prior	0	0
Revolving Loans	0	0
Total	0	369
Residential construction | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,032	854
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans	0	0
Total	1,032	854
Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Total	8,177,267	8,595,457
Commercial Business | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	534,428	1,249,771
Year two	251,276	215,623
Year three	161,996	144,348
Year four	113,049	89,205
Year five	68,581	38,836
Prior	66,116	87,689
Revolving Loans	399,082	442,076
Total	1,594,528	2,267,548
Commercial Business | Commercial business | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	532,473	1,244,822
Year two	245,034	208,682
Year three	151,622	138,861
Year four	110,341	86,830
Year five	66,806	34,498
Prior	61,688	81,760
Revolving Loans	389,218	433,016
Total	1,557,182	2,228,469
Commercial Business | Commercial business | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	109	1,929
Year two	2,247	1,382
Year three	7,634	1,119
Year four	1,711	708
Year five	673	309
Prior	554	621
Revolving Loans	8,094	4,319
Total	21,022	10,387
Commercial Business | Commercial business | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,846	2,914
Year two	3,995	4,564
Year three	2,740	3,519
Year four	997	1,631
Year five	1,102	2,745
Prior	3,874	3,456
Revolving Loans	1,770	1,829
Total	16,324	20,658
Commercial Business | Commercial business | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	106
Year two	0	995
Year three	0	849
Year four	0	36
Year five	0	1,284
Prior	0	1,852
Revolving Loans	0	2,912
Total	0	8,034
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	3,756	3,789
Year two	1,708	6,430
Year three	4,705	6,265
Year four	4,882	3,662
Year five	2,280	4,214
Prior	39,264	36,597
Revolving Loans	394,170	456,297
Total	450,765	517,254
Consumer | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	3,312	2,575
Year two	1,441	4,609
Year three	3,531	5,112
Year four	3,632	2,110
Year five	1,571	2,614
Prior	29,118	24,444
Revolving Loans	367,144	417,737
Total	409,749	459,201
Consumer | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	220	374
Year two	196	445
Year three	329	334
Year four	591	428
Year five	481	467
Prior	5,278	5,401
Revolving Loans	14,135	21,052
Total	21,230	28,501
Consumer | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	104	89
Year two	15	1,216
Year three	241	294
Year four	186	339
Year five	161	601
Prior	2,563	3,926
Revolving Loans	6,165	6,153
Total	9,435	12,618
Consumer | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	120	751
Year two	56	160
Year three	604	525
Year four	473	785
Year five	67	532
Prior	2,305	2,826
Revolving Loans	6,726	11,355
Total	$ 10,351	$ 16,934

CREDIT QUALITY ASSESSMENT - Res

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, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 13,477	$ 4,533
Individual allowance	214	1,020
Restructured and subsequently defaulted	0	0
All Other Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	0	549
Individual allowance	0	0
Restructured and subsequently defaulted	0	0
Troubled debt restructurings:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured accruing	0	929
Restructured non-accruing	13,477	3,604
Troubled debt restructurings: | All Other Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured accruing	0	549
Restructured non-accruing	0	0
Commercial real estate: | Commercial investor real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	9,594	723
Individual allowance	0	65
Restructured and subsequently defaulted	0	0
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	3,157	930
Individual allowance	0	0
Restructured and subsequently defaulted	0	0
Commercial real estate: | Commercial AD&C
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	0	0
Individual 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	0
Restructured non-accruing	9,594	723
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	3,157	930
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	726	2,331
Individual allowance	214	955
Restructured and subsequently defaulted	0	0
Commercial Business | Troubled debt restructurings:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured accruing	0	380
Restructured non-accruing	$ 726	$ 1,951

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS - Gross Carrying Amounts and Accumulated Amortization (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 42,944	$ 42,944
Accumulated Amortization	(15,413)	(10,423)
Net Carrying Amount	27,531	32,521
Goodwill	370,223	370,223
Goodwill	370,223	370,223
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	29,038	29,038
Accumulated Amortization	(11,496)	(7,969)
Net Carrying Amount	$ 17,542	$ 21,069
Core deposit intangibles | Weighted Average
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	7 years 8 months 12 days	8 years 4 months 24 days
Other identifiable intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 13,906	$ 13,906
Accumulated Amortization	(3,917)	(2,454)
Net Carrying Amount	$ 9,989	$ 11,452
Other identifiable intangibles | Weighted Average
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	10 years	10 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, 2021USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 370,223
No Activity	0
Ending balance	370,223
Community Banking
Goodwill [Roll Forward]
Beginning balance	331,688
No Activity	0
Ending balance	331,688
Insurance
Goodwill [Roll Forward]
Beginning balance	6,788
No Activity	0
Ending balance	6,788
Investment Management
Goodwill [Roll Forward]
Beginning balance	31,747
No Activity	0
Ending balance	$ 31,747

GOODWILL AND OTHER INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS (Estimated Future Amortization Expense for Amortizing Intangibles) (Detail) $ in Thousands	Sep. 30, 2021USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining 2021	$ 1,610
2022	5,844
2023	5,089
2024	4,333
2025	3,567
Thereafter	7,088
Total amortizing intangible assets	$ 27,531

DEPOSITS - Composition of Depos

DEPOSITS - Composition of Deposits (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deposits [Abstract]
Noninterest-bearing deposits	$ 3,987,411	$ 3,325,547
Interest-bearing deposits:
Demand	1,399,060	1,292,164
Money market savings	3,595,643	3,339,645
Regular savings	496,432	418,051
Time deposits of less than $100,000	435,139	509,919
Time deposits greater than $100,000 and less than $250,000	643,414	670,717
Time deposits of $250,000 or more	430,301	477,026
Total interest-bearing deposits	6,999,989	6,707,522
Total deposits	$ 10,987,400	$ 10,033,069

BORROWINGS - Narrative (Detail)

BORROWINGS - Narrative (Detail) - USD ($)	Apr. 01, 2020	Nov. 05, 2019	Dec. 31, 2020	Sep. 30, 2021	Oct. 05, 2020
Debt Instrument [Line Items]
Long-term borrowings			$ 227,088,000	$ 172,639,000
Long-term debt			1,149,320,000	320,143,000
FHLB advances			379,100,000	0
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
FHLB advances repaid				279,000,000
FHLB prepayment penalties				9,100,000
Maximum borrowing capacity			3,000,000,000	3,900,000,000
Federal Home Loan Bank Advances | Residential mortgage
Debt Instrument [Line Items]
Loans pledged as collateral			1,000,000,000	786,800,000
Federal Home Loan Bank Advances | Commercial real estate loans
Debt Instrument [Line Items]
Loans pledged as collateral			2,800,000,000	2,800,000,000
Federal Home Loan Bank Advances | Home equity lines of credit
Debt Instrument [Line Items]
Loans pledged as collateral			226,200,000	226,400,000
Federal Home Loan Bank Advances | Multifamily loans
Debt Instrument [Line Items]
Loans pledged as collateral			237,600,000	303,200,000
Federal Reserve and correspondent banks
Debt Instrument [Line Items]
Maximum borrowing capacity			276,200,000	108,600,000
Line of credit			0	0
Unsecured lines of credit, correspondent banks
Debt Instrument [Line Items]
Maximum borrowing capacity			1,100,000,000	1,400,000,000
Line of credit			390,000,000	0
Subordinated Debt
Debt Instrument [Line Items]
Add: Purchase accounting premium			$ 1,669,000	0
Subordinated Debt | Fixed Floating Rate Subordinated Notes
Debt Instrument [Line Items]
Long-term borrowings		$ 175,000,000
Interest rate		4.25%
Basis spread on variable rate		2.62%
Unamortized discount (premium) and debt issuance costs, net		$ 2,900,000
Subordinated Debt | WashingtonFirst Bankshares Inc
Debt Instrument [Line Items]
Long-term borrowings				25,000,000
Interest rate					6.00%
Basis spread on variable rate			4.57%
Add: Purchase accounting premium				$ 2,200,000
Debt instrument, term				10 years
Subordinated Debt | Revere acquisition
Debt Instrument [Line Items]
Long-term borrowings	$ 31,000,000
Interest rate	5.625%
Basis spread on variable rate				4.41%
Add: Purchase accounting premium	$ 200,000
Debt instrument, term	10 years
Retail Repurchase Agreements
Debt Instrument [Line Items]
Long-term debt			$ 153,200,000	$ 147,500,000
Federal Funds Purchased
Debt Instrument [Line Items]
Long-term debt			$ 390,000,000	0
Federal funds under the PPPLF program
Debt Instrument [Line Items]
Long-term debt				$ 0

BORROWINGS - Schedule of Subord

BORROWINGS - Schedule of Subordinated Borrowing (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Oct. 05, 2020	Apr. 01, 2020
Subordinated Borrowing [Line Items]
Long-term borrowings	$ 172,639	$ 227,088
Subordinated Debt
Subordinated Borrowing [Line Items]
Subordinated debt, gross	175,000	231,000
Less: Debt held as investments by Sandy Spring	0	(3,000)
Add: Purchase accounting premium	0	1,669
Less: Debt issuance costs	(2,361)	(2,581)
Subordinated Debt | Fixed Floating
Subordinated Borrowing [Line Items]
Subordinated debt, gross	$ 175,000	175,000
Interest rate	4.25%
Subordinated Debt | WashingtonFirst Bankshares Inc
Subordinated Borrowing [Line Items]
Subordinated debt, gross	$ 0	25,000
Add: Purchase accounting premium	2,200
Long-term borrowings	25,000
Interest rate			6.00%
Subordinated Debt | Revere acquisition
Subordinated Borrowing [Line Items]
Subordinated debt, gross	$ 0	$ 31,000
Add: Purchase accounting premium				$ 200
Long-term borrowings				$ 31,000
Interest rate				5.625%

STOCKHOLDERS' EQUITY - Narrativ

STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2018
Equity [Line Items]
Stock repurchased and retired (in shares)	1,261,828	1,261,828	820,328
Repurchase Plan 2020 | Common Stock
Equity [Line Items]
Number of shares authorized to be repurchased (in shares)				2,350,000
Repurchase Plan 2018
Equity [Line Items]
Common stock repurchased, average price (in dollars per share)		$ 43.05
Stock repurchased and retired		$ 54.3
Repurchase Plan 2018 | Common Stock
Equity [Line Items]
Stock repurchased (in shares)		1,261,828
Common stock repurchased, average price (in dollars per share)				$ 33.58
Stock repurchased and retired			$ 25.7	$ 50
Shares available for issuance (in shares)					1,800,000
Stock repurchased and retired (in shares)			820,328	1,488,519

SHARE BASED COMPENSATION - Narr

SHARE BASED COMPENSATION - Narrative (Detail) - 2015 Omnibus Incentive Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	May 06, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)					1,500,000
Shares available for issuance (in shares)	790,800		790,800
Expiration period			10 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period			7 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period			10 years
Stock Options and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	$ 1.3	$ 1	$ 3.6	$ 2.8
Restricted shares, Restricted stock units and Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 9.4		$ 9.4
Expected cost recognition weighted average period			2 years 3 months 18 days
Shares issued (in shares)			128,557
Performance Shares | 3 Year Vesting Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)			32,728
Performance period			3 years
Time Based Shares | 3 or 5 Year Vesting Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)			95,829
Time Based Shares | 3 or 5 Year Vesting Period | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Stock Options | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			0

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		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Number of Common Shares
Beginning balance (in shares)			430,038
Granted (in shares)			0
Exercised (in shares)	(53,079)	(1,575)	(193,602)	(10,213)
Forfeited (in shares)			0
Expired (in shares)			0
Ending balance (in shares)	236,436		236,436		430,038
Exercisable at end of period (in shares)	236,436		236,436
Weighted Average Exercise Share Price
Beginning balance (in dollars per share)			$ 14.97
Granted (in dollars per share)			0
Exercised (in dollars per share)			13.35
Forfeited (in dollars per share)			0
Expired (in dollars per share)			0
Ending balance (in dollars per share)	$ 16.30		16.30		$ 14.97
Exercisable at end of period (in dollars per share)	$ 16.30		$ 16.30
Weighted Average Contractual Remaining Life (Years)
Balance at end of period			2 years 6 months		3 years
Exercisable at end of period			2 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]
Beginning balance			$ 6,828
Exercised			5,356
Ending balance	$ 6,311		6,311		$ 6,828
Exercisable at end of period	$ 6,311		$ 6,311

SHARE BASED COMPENSATION - Su_2

SHARE BASED COMPENSATION - Summary of Activity Restricted Stock (Detail) - Restricted Stock	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Number of Common Shares/Units
Nonvested beginning balance (in shares) | shares	391,683
Granted (in shares) | shares	128,557
Vested (in shares) | shares	(119,228)
Forfeited (in shares) | shares	(6,859)
Nonvested ending balance (in shares) | shares	394,153
Weighted Average Grant-Date Fair Value
Nonvested beginning balance (in dollars per share) | $ / shares	$ 29.50
Granted (in dollars per share) | $ / shares	41.05
Vested (in dollars per share) | $ / shares	31.48
Forfeited (in dollars per share) | $ / shares	34.33
Nonvested ending balance (in dollars per share) | $ / shares	$ 32.62

PENSION PLAN (Net Periodic Bene

PENSION PLAN (Net Periodic Benefit Cost) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
Interest cost on projected benefit obligation	$ 316	$ 359	$ 952	$ 1,078
Expected return on plan assets	(312)	(456)	(936)	(1,368)
Recognized net actuarial loss	228	219	682	656
Net periodic benefit cost	$ 232	$ 122	$ 698	$ 366

PENSION PLAN - Narrative (Detai

PENSION PLAN - Narrative (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Retirement Benefits [Abstract]
Contributions by employer	$ 1

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 56,976	$ 44,642	$ 189,703	$ 40,291
Distributed and undistributed earnings allocated to participating securities	(354)	(373)	(1,219)	(317)
Net income attributable to common shareholders	$ 56,622	$ 44,269	$ 188,484	$ 39,974
Total weighted average outstanding shares (in shares)	47,197,000	47,415,000	47,409,000	43,261,000
Less: weighted average participating securities (in shares)	(294,000)	(397,000)	(307,000)	(355,000)
Basic weighted average common shares (in shares)	46,903,000	47,018,000	47,102,000	42,906,000
Dilutive weighted average common stock equivalents (in shares)	184,000	157,000	213,000	165,000
Diluted weighted average common shares (in shares)	47,087,000	47,175,000	47,315,000	43,071,000
Basic net income per common share (in dollars per share)	$ 1.21	$ 0.94	$ 4	$ 0.93
Diluted net income per common share (in dollars per share)	$ 1.20	$ 0.94	$ 3.98	$ 0.93
Anti-dilutive shares (in shares)	0	37,000	0	22,000

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 18,705
Other comprehensive loss before reclassification, net of tax			(20,218)
Reclassifications from accumulated other comprehensive income, net of tax			387
Total other comprehensive income/ (loss)	$ (5,960)	$ 2,669	(19,831)	$ 21,825
Ending Balance	(1,126)		(1,126)
Unrealized Gains on Investments Available-for-Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			28,175	4,000
Other comprehensive loss before reclassification, net of tax			(20,218)	21,650
Reclassifications from accumulated other comprehensive income, net of tax			(133)	(322)
Total other comprehensive income/ (loss)			(20,351)	21,328
Ending Balance	7,824	25,328	7,824	25,328
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(9,470)	(8,332)
Other comprehensive loss before reclassification, net of tax			0	0
Reclassifications from accumulated other comprehensive income, net of tax			520	497
Total other comprehensive income/ (loss)			520	497
Ending Balance	(8,950)	(7,835)	(8,950)	(7,835)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			18,705	(4,332)
Other comprehensive loss before reclassification, net of tax				21,650
Reclassifications from accumulated other comprehensive income, net of tax				175
Total other comprehensive income/ (loss)	(5,960)	2,669	(19,831)	21,825
Ending Balance	$ (1,126)	$ 17,493	$ (1,126)	$ 17,493

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Unrealized gains on investments available for sale, affected line items in the Statements of Income
Investment securities gains			$ 178	$ 432
Income before taxes	$ 49	$ 51	178	432
Tax expense	$ (12)	$ (13)	(45)	(110)
Net income			133	322
Amortization of defined benefit pension plan items Affected line item in the Statements of Income:
Recognized actuarial loss			(682)	(656)
Loss before taxes			(682)	(656)
Tax benefit			162	159
Net loss			$ (520)	$ (497)

LEASES - Narrative (Details)

LEASES - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Lease liability	$ 69,060	$ 74,982
Operating lease ROU assets	$ 59,597	$ 65,215
Minimum
Lessee, Lease, Description [Line Items]
Renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Renewal term	20 years
Lease operation commence in 2021
Lessee, Lease, Description [Line Items]
Lease liability	$ 1,800
Operating lease ROU assets	1,500
Tenant allowance	$ 200

LEASES - Lease Cost (Details)

LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Components of lease expense:
Operating lease cost (resulting from lease payments)	$ 3,047	$ 3,154	$ 9,333	$ 9,281
Supplemental cash flow information related to leases:
Operating cash flows from operating leases	3,208	4,158	9,762	10,160
ROU assets obtained in the exchange for lease liabilities due to new leases and acquisitions	0	0	803	0
Supplemental balance sheet information related to leases:
Operating lease ROU assets	59,597		59,597		$ 65,215
Lease liability	$ 69,060		$ 69,060		$ 74,982
Other information related to leases:
Weighted average remaining lease term of operating leases	9 years 1 month 6 days		9 years 1 month 6 days		9 years 6 months
Weighted average discount rate of operating leases	2.92%		2.92%		3.04%
Revere Bank And RPJ
Supplemental cash flow information related to leases:
ROU assets obtained in the exchange for lease liabilities due to new leases and acquisitions	$ 0	$ 0	$ 0	$ 7,720

LEASES - Maturities of operatin

LEASES - Maturities of operating lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remaining 2021	$ 3,169
2022	11,368
2023	11,332
2024	9,423
2025	7,596
Thereafter	37,302
Total undiscounted lease payments	80,190
Less: Present value discount	(11,130)
Lease liability	$ 69,060	$ 74,982

DERIVATIVES - Narrative (Detail

DERIVATIVES - Narrative (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Commercial Loan | Not Designated as Hedging Instrument | Interest rate swap agreements
Derivative [Line Items]
Notional amount	$ 391.1	$ 320.5

FAIR VALUE - Financial Assets a

FAIR VALUE - Financial Assets and Liabilities at Dates Indicated that Were Accounted for or Disclosed at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	$ 1,429,555	$ 1,348,021
Residential mortgage loans held for sale (at fair value)	44,678	78,294
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)	43,500	75,500
U.S. treasuries and government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	47,729	43,297
State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	327,793	390,367
Mortgage-backed and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	1,046,624	904,432
Corporate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	7,409	9,925
Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	1,429,555	1,348,021
Total assets	1,480,523	1,435,498
Total liabilities	(6,290)	(9,183)
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	44,678	78,294
Fair Value, Recurring | U.S. treasuries and government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	47,729	43,297
Fair Value, Recurring | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	327,793	390,367
Fair Value, Recurring | Mortgage-backed and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	1,046,624	904,432
Fair Value, Recurring | Corporate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	7,409	9,925
Fair Value, Recurring | Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements	6,290	9,183
Interest rate swap agreements	(6,290)	(9,183)
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	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]
Proceeds from sales of investment available-for-sale	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]
Proceeds from sales of investment available-for-sale	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]
Proceeds from sales of investment available-for-sale	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]
Proceeds from sales of investment available-for-sale	0	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]
Proceeds from sales of investment available-for-sale	1,422,146	1,338,096
Total assets	1,473,114	1,425,573
Total liabilities	(6,290)	(9,183)
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	44,678	78,294
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]
Proceeds from sales of investment available-for-sale	47,729	43,297
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	327,793	390,367
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-backed and asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	1,046,624	904,432
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	0	0
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	6,290	9,183
Interest rate swap agreements	(6,290)	(9,183)
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	7,409	9,925
Total assets	7,409	9,925
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]
Proceeds from sales of investment available-for-sale	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	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]
Proceeds from sales of investment available-for-sale	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sales of investment available-for-sale	7,409	9,925
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, 2021USD ($)
Investments available-for-sale:
Beginning balance	$ 9,925
Additions of Level 3 assets	0
Sales of Level 3 assets	(2,102)
Total unrealized loss included in other comprehensive income/ (loss)	(414)
Ending balance	$ 7,409

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, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	$ 1,826	$ 15,356
Total Losses	(6,845)	(11,612)
Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	721	13,901
Total Losses	(6,771)	(11,326)
Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	1,105	1,455
Total Losses	(74)	(286)
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	1,826	15,356
Fair Value, Inputs, Level 3 | Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure, nonrecurring	721	13,901
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	$ 1,105	$ 1,455

FAIR VALUE - Narrative (Details

FAIR VALUE - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Balance of loans individually evaluated for credit loss	$ 38.4	$ 97.7
Loans receivable, fair value	30.9	86.3
Allowance related to loans evaluated individually	$ 7.5	$ 11.4

FAIR VALUE - Carrying Amounts a

FAIR VALUE - Carrying Amounts and Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets:
Residential mortgage loans held for sale (at fair value)	$ 44,678	$ 78,294
Investments available-for-sale	1,429,555	1,348,021
Loans, net of allowance	9,613,428	10,235,142
Accrued interest receivable	36,219	46,431
Financial liabilities:
Other deposits	10,987,400	10,033,069
Securities sold under retail repurchase agreements and federal funds purchased	147,504	543,157
Advances from FHLB	0	379,075
Subordinated debt	172,639	227,088
Carrying Amount
Financial assets:
Cash and cash equivalents	1,114,633	297,003
Residential mortgage loans held for sale (at fair value)	44,678	78,294
Investments available-for-sale	1,429,555	1,348,021
Equity securities	41,097	65,760
Loans, net of allowance	9,613,428	10,235,142
Interest rate swap agreements	6,290	9,183
Accrued interest receivable	36,219	46,431
Bank owned life insurance	146,710	126,887
Financial liabilities:
Time deposits	1,508,854	1,657,662
Other deposits	9,478,546	8,375,407
Securities sold under retail repurchase agreements and federal funds purchased	147,504	543,157
Advances from FHLB	0	379,075
Subordinated debt	172,639	227,088
Interest rate swap agreements	6,290	9,183
Accrued interest payable	3,714	3,254
Estimated Fair Value
Financial assets:
Cash and cash equivalents	1,114,633	297,003
Residential mortgage loans held for sale (at fair value)	44,678	78,294
Investments available-for-sale	1,429,555	1,348,021
Equity securities	41,097	65,760
Loans, net of allowance	9,677,624	10,336,355
Interest rate swap agreements	6,290	9,183
Accrued interest receivable	36,219	46,431
Bank owned life insurance	146,710	126,887
Financial liabilities:
Time deposits	1,515,231	1,674,112
Other deposits	9,478,546	8,375,407
Securities sold under retail repurchase agreements and federal funds purchased	147,504	543,157
Advances from FHLB	0	390,593
Subordinated debt	174,659	227,512
Interest rate swap agreements	6,290	9,183
Accrued interest payable	3,714	3,254
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	1,114,633	297,003
Residential mortgage loans held for sale (at fair value)	0	0
Investments available-for-sale	0	0
Equity securities	41,097	65,760
Loans, net of allowance	0	0
Interest rate swap agreements	0	0
Accrued interest receivable	36,219	46,431
Bank owned life insurance	0	0
Financial liabilities:
Time deposits	0	0
Other deposits	9,478,546	8,375,407
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	3,714	3,254
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)	44,678	78,294
Investments available-for-sale	1,422,146	1,338,096
Equity securities	0	0
Loans, net of allowance	0	0
Interest rate swap agreements	6,290	9,183
Accrued interest receivable	0	0
Bank owned life insurance	146,710	126,887
Financial liabilities:
Time deposits	1,515,231	1,674,112
Other deposits	0	0
Securities sold under retail repurchase agreements and federal funds purchased	147,504	543,157
Advances from FHLB	0	390,593
Subordinated debt	0	0
Interest rate swap agreements	6,290	9,183
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	7,409	9,925
Equity securities	0	0
Loans, net of allowance	9,677,624	10,336,355
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	174,659	227,512
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, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)segment	Sep. 30, 2020USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			3
Amortization of Intangible Assets	$ 1,635	$ 1,968	$ 4,991	$ 4,566
Community Banking
Segment Reporting Information [Line Items]
Amortization of Intangible Assets	1,200	1,400	3,500	3,200
Insurance
Segment Reporting Information [Line Items]
Amortization of Intangible Assets			0	0
Investment Management
Segment Reporting Information [Line Items]
Amortization of Intangible Assets	500	$ 500	1,400	$ 1,400
Investment Management | West Financial and RPJ
Segment Reporting Information [Line Items]
Assets under management	$ 3,800,000		$ 3,800,000

SEGMENT REPORTING - Operating S

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Interest income	$ 111,129	$ 112,984	$ 340,213	$ 311,769
Interest expense	4,525	15,500	20,963	48,437
Provision/ (credit) for credit losses	(8,229)	7,003	(47,141)	90,158	$ 85,669
Non-interest income	24,394	29,390	79,519	70,482
Non-interest expense	63,181	60,937	194,329	194,121
Income before income tax expense	76,046	58,934	251,581	49,535
Income tax expense	19,070	14,292	61,878	9,244
Net income	56,976	44,642	189,703	40,291
Assets	13,017,464	12,678,131	13,017,464	12,678,131	$ 12,798,429
Inter-Segment Elimination
Segment Reporting Information [Line Items]
Interest income	(3)	(3)	(9)	(10)
Interest expense	(3)	(3)	(9)	(10)
Provision/ (credit) for credit losses	0	0	0	0
Non-interest income	(217)	(221)	(4,651)	(645)
Non-interest expense	(217)	(221)	(651)	(645)
Income before income tax expense	0	0	(4,000)	0
Income tax expense	0	0	0	0
Net income	0	0	(4,000)	0
Assets	(66,527)	(68,642)	(66,527)	(68,642)
Community Banking | Operating Segments
Segment Reporting Information [Line Items]
Interest income	111,129	112,985	340,213	311,771
Interest expense	4,528	15,503	20,972	48,447
Provision/ (credit) for credit losses	(8,229)	7,003	(47,141)	90,158
Non-interest income	16,644	24,746	62,083	57,976
Non-interest expense	58,059	57,856	179,803	184,921
Income before income tax expense	73,415	57,369	248,662	46,221
Income tax expense	18,385	13,912	59,951	8,396
Net income	55,030	43,457	188,711	37,825
Assets	13,017,464	12,678,396	13,017,464	12,678,396
Insurance | Operating Segments
Segment Reporting Information [Line Items]
Interest income	0	1	2	5
Interest expense	0	0	0	0
Provision/ (credit) for credit losses	0	0	0	0
Non-interest income	2,282	2,119	5,679	5,446
Non-interest expense	1,696	1,580	4,507	4,319
Income before income tax expense	586	540	1,174	1,132
Income tax expense	185	149	347	313
Net income	401	391	827	819
Assets	9,203	11,289	9,203	11,289
Investment Management | Operating Segments
Segment Reporting Information [Line Items]
Interest income	3	1	7	3
Interest expense	0	0	0	0
Provision/ (credit) for credit losses	0	0	0	0
Non-interest income	5,685	2,746	16,408	7,705
Non-interest expense	3,643	1,722	10,670	5,526
Income before income tax expense	2,045	1,025	5,745	2,182
Income tax expense	500	231	1,580	535
Net income	1,545	794	4,165	1,647
Assets	$ 57,324	$ 57,088	$ 57,324	$ 57,088

Uncategorized Items - sasr-2021

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]