Provident Financial Services (PFS) 10-Q 10 May 21 2021 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	May 03, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-31566
Entity Registrant Name	PROVIDENT FINANCIAL SERVICES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	42-1547151
Entity Address, Address Line One	239 Washington Street
Entity Address, City or Town	Jersey City
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07302
City Area Code	732
Local Phone Number	590-9200
Title of 12(b) Security	Common
Trading Symbol	PFS
Security Exchange Name	NYSE
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		77,966,795
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001178970

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 559,235	$ 404,355
Short-term investments	128,335	127,998
Total cash and cash equivalents	687,570	532,353
Available for sale debt securities, at fair value	1,216,936	1,105,489
Held to maturity debt securities, net (fair value of $463,993 at March 31, 2021 (unaudited) and $472,529 at December 31, 2020)	447,902	450,965
Equity securities, at fair value	1,026	971
Federal Home Loan Bank stock	48,998	59,489
Loans	9,803,536	9,822,890
Less allowance for credit losses	85,591	101,466
Net loans	9,717,945	9,721,424
Foreclosed assets, net	3,554	4,475
Banking premises and equipment, net	75,344	75,946
Accrued interest receivable	43,883	46,450
Intangible assets	465,335	466,212
Bank-owned life insurance	235,112	234,607
Other assets	186,840	221,360
Total assets	13,130,445	12,919,741
Deposits:
Demand deposits	7,932,146	7,395,508
Savings deposits	1,402,363	1,348,147
Certificates of deposit of $100,000 or more	604,732	717,216
Other time deposits	358,272	376,958
Total deposits	10,297,513	9,837,829
Mortgage escrow deposits	37,772	34,298
Borrowed funds	940,611	1,175,972
Subordinated debentures	25,173	25,135
Other liabilities	182,145	226,710
Total liabilities	11,483,214	11,299,944
Stockholders’ Equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized, none issued	0	0
Common stock, $0.01 par value, 200,000,000 shares authorized, 83,209,012 shares issued and 77,798,624 shares outstanding at March 31, 2021 and 77,611,107 outstanding at December 31, 2020	832	832
Additional paid-in capital	963,556	962,453
Retained earnings	748,574	718,090
Accumulated other comprehensive income	12,977	17,655
Treasury stock	(59,261)	(59,018)
Unallocated common stock held by the Employee Stock Ownership Plan	(19,447)	(20,215)
Common stock acquired by deferred compensation plans	(4,381)	(4,549)
Deferred compensation plans	4,381	4,549
Total stockholders’ equity	1,647,231	1,619,797
Total liabilities and stockholders’ equity	$ 13,130,445	$ 12,919,741

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Held to maturity debt securities	$ 463,993	$ 472,529
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	83,209,012	83,209,012
Common stock, shares outstanding (in shares)	77,798,624	77,611,107

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest income:
Real estate secured loans	$ 62,016	$ 54,441
Commercial loans	26,143	18,672
Consumer loans	3,492	4,172
Available for sale debt securities, equity securities and Federal Home Loan Bank stock	5,612	7,069
Held to maturity debt securities	2,784	2,940
Deposits, Federal funds sold and other short-term investments	484	875
Total interest income	100,531	88,169
Interest expense:
Deposits	7,417	10,958
Borrowed funds	2,809	5,190
Subordinated debt	305	0
Total interest expense	10,531	16,148
Net interest income	90,000	72,021
Provision (benefit) charge for credit losses	(15,001)	14,717
Net interest income after provision for credit losses	105,001	57,304
Non-interest income:
Fees	7,192	6,529
Wealth management income	7,134	6,251
Insurance agency income	2,727	0
Bank-owned life insurance	2,567	787
Net gains on securities transactions	197	11
Other income	1,820	3,413
Total non-interest income	21,637	16,991
Non-interest expense:
Compensation and employee benefits	35,312	31,195
Net occupancy expense	9,301	6,203
Data processing expense	4,393	4,430
FDIC insurance	1,770	0
Amortization of intangibles	972	744
Advertising and promotion expense	877	1,369
Credit loss (benefit) expense for off-balance sheet credit exposures	(875)	1,000
Other operating expenses	10,103	9,166
Total non-interest expense	61,853	54,107
Income before income tax expense	64,785	20,188
Income tax expense	16,226	5,257
Net income	$ 48,559	$ 14,931
Basic earnings per share (usd per share)	$ 0.63	$ 0.23
Weighted average basic shares outstanding (in shares)	76,516,543	64,386,138
Diluted earnings per share (usd per share)	$ 0.63	$ 0.23
Weighted average diluted shares outstanding (in shares)	76,580,862	64,457,263

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 48,559	$ 14,931
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	(9,019)	16,746
Reclassification adjustment for gains included in net income	(171)	0
Total	(9,190)	16,746
Unrealized gains (losses) on derivatives	4,621	(5,713)
Amortization related to post-retirement obligations	(109)	84
Total other comprehensive (loss) income	(4,678)	11,117
Total comprehensive income	$ 43,881	$ 26,048

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME	TREASURYSTOCK	UNALLOCATED ESOP SHARES	COMMON STOCK ACQUIRED BY DEFERRED COMP PLANS	DEFERRED COMPENSATION PLANS
Beginning balance at Dec. 31, 2019	$ 1,413,840	$ 832	$ 1,007,303	$ 695,273	$ 3,821	$ (268,504)	$ (24,885)	$ (3,833)	$ 3,833
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,931			14,931
Other comprehensive income (loss), net of tax	11,117				11,117
Cash dividends paid	(15,496)			(15,496)
Distributions from DDFP	37		37					167	(167)
Purchases of treasury stock	(4,985)					(4,985)
Purchase of employee restricted shares to fund statutory tax withholding	(956)					(956)
Shares issued dividend reinvestment plan	451		50			401
Allocation of ESOP shares	921		152				769
Allocation of Stock Award Plan ("SAP") shares	993		993
Allocation of stock options	47		47
Ending Balance at Mar. 31, 2020	1,412,589	832	1,008,582	686,397	14,938	(274,044)	(24,116)	(3,666)	3,666
Beginning balance at Dec. 31, 2020	1,619,797	832	962,453	718,090	17,655	(59,018)	(20,215)	(4,549)	4,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,559			48,559
Other comprehensive income (loss), net of tax	(4,678)				(4,678)
Cash dividends paid	(18,075)			(18,075)
Distributions from DDFP	28		28					168	(168)
Purchases of treasury stock	(48)					(48)
Purchase of employee restricted shares to fund statutory tax withholding	(915)					(915)
Shares issued dividend reinvestment plan	0
Stock option exercises	638		(82)			720
Allocation of ESOP shares	913		145				768
Allocation of Stock Award Plan ("SAP") shares	959		959
Allocation of stock options	53		53
Ending Balance at Mar. 31, 2021	$ 1,647,231	$ 832	$ 963,556	$ 748,574	$ 12,977	$ (59,261)	$ (19,447)	$ (4,381)	$ 4,381

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 48,559	$ 14,931
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	3,264	2,494
Provision (benefit) charge for credit losses	(15,001)	14,717
Credit loss (benefit) expense for off-balance sheet credit exposures	(875)	1,000
Deferred tax expense (benefit)	6,271	(1,492)
Amortization of operating lease right-of-use assets	2,812	2,130
Income on Bank-owned life insurance	(2,567)	(787)
Net amortization of premiums and discounts on securities	3,110	1,913
Accretion of net deferred loan fees	(5,487)	(1,521)
Amortization of premiums on purchased loans, net	190	192
Net increase in loans originated for sale	(14,492)	(4,022)
Proceeds from sales of loans originated for sale	15,260	4,335
Proceeds from sales and paydowns of foreclosed assets	569	256
ESOP expense	913	921
Allocation of stock award shares	959	993
Allocation of stock options	53	47
Net gain on sale of loans	(768)	(313)
Net gain on securities transactions	(197)	(11)
Net gain on sale of premises and equipment	(15)	(641)
Net gain on sale of foreclosed assets	(170)	(29)
(Increase) decrease in accrued interest receivable	(2,567)	1,232
Decrease (increase) in other assets	41,160	(82,099)
(Decrease) increase in other liabilities	(44,565)	79,111
Net cash provided by operating activities	36,416	33,357
Cash flows from investing activities:
Proceeds from maturities, calls and paydowns of held to maturity debt securities	10,236	17,225
Purchases of held to maturity debt securities	(7,541)	(9,674)
Proceeds from sales of securities	9,442	0
Proceeds from maturities and paydowns of available for sale debt securities	90,807	64,466
Purchases of available for sale debt securities	(226,417)	(56,172)
Proceeds from redemption of Federal Home Loan Bank stock	12,147	28,549
Purchases of Federal Home Loan Bank stock	(1,656)	(32,449)
BOLI claim benefits received	0	1,985
Net decrease (increase) in loans	24,217	(39,897)
Proceeds from sales of premises and equipment	15	641
Purchases of premises and equipment	(1,846)	(1,664)
Net cash used in investing activities	(90,596)	(26,990)
Cash flows from financing activities:
Net increase in deposits	459,684	108,151
Increase in mortgage escrow deposits	3,474	1,666
Cash dividends paid to stockholders	(18,075)	(15,496)
Shares issued dividend reinvestment plan	0	451
Purchase of treasury stock	(48)	(4,985)
Purchase of employee restricted shares to fund statutory tax withholding	(915)	(956)
Stock options exercised	638	0
Proceeds from long-term borrowings	400,000	632,554
Payments on long-term borrowings	(619,265)	(300,159)
Net decrease in short-term borrowings	(16,096)	(243,764)
Net cash provided by financing activities	209,397	177,462
Net increase in cash and cash equivalents	155,217	183,829
Cash and cash equivalents at beginning of period	532,353	186,748
Cash and cash equivalents at end of period	687,570	370,577
Cash paid during the period for:
Interest on deposits and borrowings	10,399	15,819
Income taxes	270	115
Non-cash investing activities:
Transfer of loans receivable to foreclosed assets	$ 434	$ 2,067

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies A. Basis of Financial Statement Presentation The accompanying unaudited consolidated financial statements include the accounts of Provident Financial Services, Inc. and its wholly owned subsidiary, Provident Bank (the “Bank,” together with Provident Financial Services, Inc., the “Company”). In preparing the interim unaudited consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated statements of financial condition and the consolidated statements of income for the periods presented. Actual results could differ from these estimates. The allowance for credit losses and the valuation of deferred tax assets are material estimates that are particularly susceptible to near-term change. The interim unaudited consolidated financial statements reflect all normal and recurring adjustments, which are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results of operations that may be expected for all of 2021. Certain information and note disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. These unaudited consolidated financial statements should be read in conjunction with the December 31, 2020 Annual Report to Stockholders on Form 10-K. B. Earnings Per Share The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share calculations for the three months ended March 31, 2021 and 2020 (dollars in thousands, except per share amounts): Three months ended March 31, 2021 2020 Net Weighted Per Net Weighted Per Net income $ 48,559 $ 14,931 Basic earnings per share: Income available to common stockholders $ 48,559 76,516,543 $ 0.63 $ 14,931 64,386,138 $ 0.23 Dilutive shares 64,319 71,125 Diluted earnings per share: Income available to common stockholders $ 48,559 76,580,862 $ 0.63 $ 14,931 64,457,263 $ 0.23 Anti-dilutive stock options and awards at March 31, 2021 and 2020, totaling 1.2 million shares and 905,673 shares, respectively, were excluded from the earnings per share calculations. C. Loans Receivable and Allowance for Credit Losses On January 1, 2020, the Company adopted ASU 2016-13, "Measurement of Credit Losses on Financial Instruments,” which replaced the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss (“CECL”) methodology. The Company used the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. Results for reporting periods beginning after January 1, 2020 are presented under CECL. Going forward, the impact of utilizing the CECL approach to calculate the allowance for credit losses on loans will be significantly influenced by the composition, characteristics and quality of the Company’s loan portfolio, as well as the

Business Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Business Combinations	Business Combinations SB One Bancorp Acquisition On July 31, 2020, the Company completed its acquisition of SB One Bancorp ("SB One"), which added $2.20 billion to total assets, $1.77 billion to total loans and $1.76 billion to total deposits, and added 18 full-service banking offices in New Jersey and New York. As part of the acquisition, the addition of SB One Insurance Agency allowed the Company to expand its products offerings to its customers to include an array of commercial and personal insurance products. Under the merger agreement, each share of outstanding SB One common stock was exchanged for 1.357 shares of the Company's common stock. The Company issued 12.8 million shares of common stock from treasury stock, plus cash in lieu of fractional shares in the acquisition of SB One. The total consideration paid for the acquisition of SB One was $180.8 million. In connection with the acquisition, SB One Bank, a wholly owned subsidiary of SB One, was merged with and into Provident Bank, a wholly owned subsidiary of the Company. The acquisition was accounted for under the acquisition method of accounting. Under this method of accounting, the respective assets acquired and liabilities assumed were recorded at their estimated fair value. The excess of consideration paid over the estimated fair value of the net assets acquired totaled $22.4 million and was recorded as goodwill. The calculation of goodwill is subject to change for up to one year after the closing date of the transaction as additional information relative to closing date estimates and uncertainties becomes available. As the Company finalizes its analysis of these assets and liabilities, there may be adjustments to the recorded carrying values. The following table summarizes the estimated fair values of the assets acquired and the liabilities assumed at the date of acquisition from SB One (in thousands): At July 31, 2020 Assets acquired: Cash and cash equivalents, net $ 78,089 Available for sale debt securities 231,645 Held to maturity debt securities 12,381 Federal Home Loan Bank stock 11,216 Loans 1,766,115 Allowance for credit losses on PCD loans (13,586) Loans, net 1,752,529 Bank-owned life insurance 37,237 Banking premises and equipment 16,620 Accrued interest receivable 8,947 Goodwill 22,439 Other intangibles assets 9,965 Foreclosed assets, net 2,441 Other assets 12,199 Total assets acquired $ 2,195,708 Liabilities assumed: Deposits $ 1,757,777 Borrowed funds 201,582 Subordinated debentures 25,074 Other liabilities 30,447 Total liabilities assumed $ 2,014,880 Net assets acquired $ 180,828 Fair Value Measurement of Assets Assumed and Liabilities Assumed The methods used to determine the fair value of the assets acquired and liabilities assumed in the SB One acquisition were as follows: Securities Available for Sale The estimated fair values of the available for sale debt securities, primarily comprised of U.S. Government agency mortgage-backed securities and U.S. government agencies and municipal bonds carried on SB One's balance sheet was confirmed using open market pricing provided by multiple independent securities brokers. Management reviewed the open market quotes used in pricing the securities and a fair value adjustment was not recorded on the investments. Held to Maturity Debt Securities The estimated fair values of the held to maturity debt securities, primarily comprised of municipal bonds, were determined using open market pricing provided by multiple independent securities brokers. Management reviewed the open market quotes used in pricing the securities. A fair value premium of $133,000 was recorded on the investments. Loans Loans acquired in the SB One acquisition were recorded at fair value, and there was no carryover related allowance for credit losses. The fair values of loans acquired from SB One were estimated using the discounted cash flow method based on the remaining maturity and repricing terms. Cash flows were adjusted for expected losses and prepayments. Projected cash flows were then discounted to present value based on: the relative risk of the cash flows, taking into account the loan type, liquidity risk, the maturity of the loans, servicing costs, and a required return on capital; and monthly principal and interest cash flows were discounted to present value and summed to arrive at the calculated value of the loans. The fair value of the acquired loans receivable was $1.77 billion. For loans acquired without evidence of more-than-insignificant deterioration in credit quality since origination, the Company prepared the interest rate loan fair value and credit fair value adjustments. Loans were grouped into pools based on similar characteristics, such as loan type, fixed or adjustable interest rates, payment type, index rate and caps/floors, and non-accrual status. The loans were valued at the sub-pool level and were pooled at the summary level based on loan type. Market rates for similar loans were obtained from various internal and external data sources and reviewed by management for reasonableness. The average of these market rates was used as the fair value interest rate that a market participant would utilize. A present value approach was utilized to calculate the interest rate fair value premium of $8.4 million. Loans acquired that have experienced more-than-insignificant deterioration in credit quality since origination are considered purchased credit deteriorated ("PCD") loans. The Company evaluated acquired loans for deterioration in credit quality based on any of, but not limited to, the following: (1) non-accrual status; (2) troubled debt restructured designation; (3) risk ratings of special mention, substandard or doubtful; (4) watchlist credits; and (5) delinquency status, including loans that were current on acquisition date, but had been previously delinquent. At the acquisition date, an estimate of expected credit losses is made for groups of PCD loans with similar risk characteristics and individual PCD loans without similar risk characteristics. Additionally for PCD loans, an allowance for credit losses was calculated using management's best estimate of projected losses over the remaining life of the loans in accordance with ASC 326-20. This represents the portion of the loan balances that has been deemed uncollectible based on the Company’s expectations of future cash flows for each respective PCD loan pool, given the outlook and forecast inclusive of the impact of the COVID-19 pandemic ("COVID-19") and related fiscal and regulatory interventions. The expected lifetime losses were calculated using historical losses observed at the Bank, SB One and peer banks. A $13.6 million allowance for credit losses was recorded on PCD loans. The interest rate fair value adjustment related to PCD loans will be substantially recognized as interest income on a level yield amortization or straight line method over the expected life of the loans. Subsequent to the acquisition date, the initial allowance for credit losses on PCD loans will increase or decrease based on future evaluations, with changes recognized in the provision for credit losses. The table below illustrates the fair value adjustments made to the amortized cost basis in order to present a fair value of the loans acquired (in thousands): Gross amortized cost basis at July 31, 2020 $ 1,787,057 Interest rate fair value adjustment on all loans 455 Credit fair value adjustment on non-PCD loans (21,397) Fair value of acquired loans at July 31, 2020 1,766,115 Allowance for credit losses on PCD loans (13,586) Fair value of acquired loans, net at July 31, 2020 $ 1,752,529 The table below is a summary of the PCD loans accounted for in accordance with ASC 310-26 that were acquired in the SB One acquisition as of the closing date (in thousands): Gross amortized cost basis at July 31, 2020 $ 315,784 Interest component of expected cash flows (accretable difference) (7,988) Allowance for credit losses on PCD loans (13,586) Net PCD loans $ 294,210 Banking Premises and Equipment The Company acquired 18 branches from SB One, eight of which were owned premises. The fair value of properties acquired was derived by valuations prepared by an independent third party utilizing the sales comparison approach to value the property as improved. Core Deposit Intangible and Customer Relationship Intangible The fair value of the core deposit intangible was determined based on a discounted cash flow analysis using a discount rate commensurate with market participants. To calculate cash flows, deposit account servicing costs (net of deposit fee income) and interest expense on deposits were compared to the cost of alternative funding sources available through national brokered CD offering rates. The projected cash flows were developed using projected deposit attrition rates. The fair value of the customer relationship intangible was determined based on a discounted cash flow analysis using the excess of the future cash inflows (i.e., revenue from existing customer relationships) over the related cash outflows (i.e., operating costs) generated over the useful life of the acquired customer base. These cash flows were discounted to present value using an asset-specific risk-adjusted discount rate. The projected cash flows were developed using projected customer revenue retention rates. The core deposit intangible totaled $3.2 million and is being amortized over its estimated useful life of approximately 10 years based on dollar weighted deposit runoff on an annualized basis. The insurance agency customer relationship intangible totaled $6.8 million and is being amortized over its estimated useful life of approximately 13 years based on customer revenue attrition on an annualized basis. Goodwill The calculation of goodwill is subject to change for up to one year after the date of acquisition as additional information relative to the closing date estimates and uncertainties become available. As the Company finalizes its review of the acquired assets and liabilities, certain adjustments to the recorded carrying values may be required. The goodwill will be evaluated annually for impairment. The goodwill is not deductible for tax purposes. Bank Owned Life Insurance ("BOLI") SB One's BOLI cash surrender value was $37.2 million with no fair value adjustment. Time Deposits The fair value adjustment for time deposits represents a discount from the value of the contractual repayments of fixed-maturity deposits using prevailing market interest rates for similar-term time deposits. The time deposit discount of approximately $4.3 million is being amortized into income on a level yield amortization method over the contractual life of the deposits. Borrowings The fair value of Federal Home Loan Bank of New York ("FHLBNY") advances was determined based on a discounted cash flow analysis using a discount rate commensurate with FHLBNY rates as of July 31, 2020. The cash flows of the advances were projected based on the scheduled payments of the fixed rate of each advance. Subordinated Debentures At the valuation date, SB One had one outstanding Trust Preferred and one subordinated debt issuance with an aggregate balance of $27.5 million . The fair value of Trust Preferred and subordinated debt issuances was determined based on a discounted cash flow analysis using a discount rate commensurate with yields and terms of comparable issuances. The cash flows were projected through the remaining contractual term of the Trust Preferred issuance and based on the call date for the subordinated debt issuance.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities At March 31, 2021, the Company had $1.22 billion and $447.9 million in available for sale debt securities and held to maturity debt securities, respectively. Many factors, including lack of liquidity in the secondary market for certain securities, variations in pricing information, regulatory actions, changes in the business environment or any changes in the competitive marketplace could have an adverse effect on the Company’s investment portfolio. The total number of available for sale and held to maturity debt securities in an unrealized loss position at March 31, 2021 totaled 122, compared with 49 at December 31, 2020. The increase in the number of securities in an unrealized loss position at March 31, 2021 was due to higher current market interest rates compared to rates at December 31, 2020. On January 1, 2020, the Company adopted CECL which replaces the incurred loss methodology with an expected loss methodology. The Company did not record an allowance for credit losses on available for sale debt securities as this portfolio consisted primarily of debt securities explicitly or implicitly backed by the U.S. Government for which credit risk is deemed immaterial. The impact going forward will depend on the composition, characteristics, and credit quality of the securities portfolio as well as the economic conditions at future reporting periods. The Company recorded a $70,000 increase to the allowance for credit losses on held to maturity debt securities with a corresponding cumulative effect adjustment to decrease retained earnings by $52,000, net of income taxes. (See Adoption of CECL table below for additional detail.) Management measures expected credit losses on held to maturity debt securities on a collective basis by security type. Management classifies the held to maturity debt securities portfolio into the following security types: • Agency obligations; • Mortgage-backed securities; • State and municipal obligations; and • Corporate obligations. All of the agency obligations held by the Company are issued by U.S. government entities and agencies. These securities are either explicitly or implicitly guaranteed by the U.S. government, are highly rated by major rating agencies and have a long history of no credit losses. The majority of the state and municipal, and corporate obligations carry no lower than A ratings from the rating agencies at March 31, 2021 and the Company had one security rated with a triple-B by Moody’s Investors Service. The Company adopted CECL using the prospective transition approach for debt securities for which other-than-temporary impairment had been recognized prior to January 1, 2020. As a result, the amortized cost basis remains the same before and after the effective date of CECL. Available for Sale Debt Securities The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for available for sale debt securities at March 31, 2021 and December 31, 2020 (in thousands): March 31, 2021 Amortized Gross Gross Fair Mortgage-backed securities $ 1,042,480 23,915 (6,243) 1,060,152 Asset-backed securities 47,329 1,876 — 49,205 State and municipal obligations 69,443 429 (938) 68,934 Corporate obligations 38,149 739 (243) 38,645 $ 1,197,401 26,959 (7,424) 1,216,936 December 31, 2020 Amortized Gross Gross Fair Agency obligations $ 1,001 8 — 1,009 Mortgage-backed securities 910,393 28,872 (852) 938,413 Asset-backed securities 52,295 1,535 — 53,830 State and municipal obligations 69,687 1,666 (95) 71,258 Corporate obligations 40,194 809 (24) 40,979 $ 1,073,570 32,890 (971) 1,105,489 The amortized cost and fair value of available for sale debt securities at March 31, 2021, by contractual maturity, are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer. March 31, 2021 Amortized Fair Due in one year or less $ — — Due after one year through five years 3,651 3,761 Due after five years through ten years 38,002 38,532 Due after ten years 65,939 65,286 $ 107,592 107,579 Investments which pay principal on a periodic basis totaling $1.09 billion at amortized cost and $1.11 billion at fair value are excluded from the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. For the three months ended March 31, 2021, proceeds from sales on securities in the available for sale debt securities portfolio totaled $9.4 million, with gains of $230,000 and no loss recognized. No securities were sold or called from the available for sale debt securities portfolio for the three month periods ended March 31, 2020. The following tables present the fair values and gross unrealized losses for available for sale debt securities in an unrealized loss position at March 31, 2021 and December 31, 2020 (in thousands): March 31, 2021 Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Mortgage-backed securities $ 345,988 (6,209) 8,110 (34) 354,098 (6,243) State and municipal obligations 40,517 (938) — — 40,517 (938) Corporate obligations 6,655 (243) — — 6,655 (243) $ 393,160 (7,390) 8,110 (34) 401,270 (7,424) December 31, 2020 Less than 12 months 12 months or longer Total Fair value Gross Fair value Gross Fair Gross Mortgage-backed securities $ 127,600 (824) 8,007 (28) 135,607 (852) State and municipal obligations 5,275 (95) — — 5,275 (95) Corporate obligations — — 2,000 (24) 2,000 (24) $ 132,875 (919) 10,007 (52) 142,882 (971) The number of available for sale debt securities in an unrealized loss position at March 31, 2021 totaled 81, compared with 42 at December 31, 2020. The increase in the number of securities in an unrealized loss position at March 31, 2021 was due to higher current market interest rates compared to rates at December 31, 2020. At March 31, 2021, there was one private label mortgage-backed security in an unrealized loss position, with an amortized cost of $17,445 and unrealized loss of $690. This private-label mortgage-backed security was investment grade at March 31, 2021. Held to Maturity Debt Securities The following tables present the amortized cost, gross unrealized gains, gross unrealized losses, allowance for credit losses and the estimated fair value for held to maturity debt securities at March 31, 2021 and December 31, 2020 (in thousands): March 31, 2021 Amortized Gross Gross Fair Agency obligations $ 8,998 1 (95) 8,904 Mortgage-backed securities 50 1 — 51 State and municipal obligations 428,631 16,970 (825) 444,776 Corporate obligations 10,300 65 (103) 10,262 $ 447,979 17,037 (1,023) 463,993 At March 31, 2021, the allowance for credit losses on held to maturity debt securities totaled $77,000. December 31, 2020 Amortized Gross Gross Fair Agency obligations $ 7,600 6 (5) 7,601 Mortgage-backed securities 62 2 — 64 State and municipal obligations 433,655 21,442 (58) 455,039 Corporate obligations 9,726 101 (2) 9,825 $ 451,043 21,551 (65) 472,529 At December 31, 2020, the allowance for credit losses on held to maturity debt securities totaled $78,000. The Company generally purchases securities for long-term investment purposes, and differences between amortized cost and fair value may fluctuate during the investment period. There were no sales of securities from the held to maturity debt securities portfolio for the three months ended March 31, 2021 and 2020. For the three months ended March 31, 2021, proceeds from calls on securities in the held to maturity debt securities portfolio totaled $6.8 million with gross losses of $33,000 and no gross gains. For the three months ended March 31, 2020, proceeds from calls of securities in the held to maturity debt securities portfolio totaled $13.3 million with gross gains of $11,000 and no gross losses. The amortized cost and fair value of investment securities in the held to maturity debt securities portfolio at March 31, 2021 by contractual maturity are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer. March 31, 2021 Amortized Fair Due in one year or less $ — — Due after one year through five years 163,682 167,460 Due after five years through ten years 213,875 224,327 Due after ten years 70,372 72,155 $ 447,929 463,942 Mortgage-backed securities totaling $50,000 at amortized cost and $51,000 at fair value are excluded from the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. Additionally, allowance for credit losses totaling $77,000 is excluded from the table above. The following table illustrates the impact of the January 1, 2020 adoption of CECL on held to maturity debt securities (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Held to Maturity Debt Securities Allowance for credit losses on corporate securities $ 6 — 6 Allowance for credit losses on municipal securities 64 — 64 Allowance for credit losses on held to maturity debt securities $ 70 — 70 The following tables present the fair values and gross unrealized losses for held to maturity debt securities in an unrealized loss position at March 31, 2021 and December 31, 2020 (in thousands): March 31, 2021 Unrealized Losses Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 6,903 (95) — — 6,903 (95) State and municipal obligations 19,697 (809) 406 (16) 20,103 (825) Corporate obligations 6,146 (103) — — 6,146 (103) $ 32,746 (1,007) 406 (16) 33,152 (1,023) December 31, 2020 Unrealized Losses Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 1,995 (5) — — 1,995 (5) State and municipal obligations 4,846 (41) 406 (17) 5,252 (58) Corporate obligations 786 (2) — — 786 (2) $ 7,627 (48) 406 (17) 8,033 (65) The number of held to maturity debt securities in an unrealized loss position at March 31, 2021 totaled 41, compared with 7 at December 31, 2020. The increase in the number of securities in an unrealized loss position at March 31, 2021, was due to higher current market interest rates compared to prevailing market rates at December 31, 2020. Credit Quality Indicators. The following table provides the amortized cost of held to maturity debt securities by credit rating as of March 31, 2021 (in thousands): March 31, 2021 Total Portfolio AAA AA A BBB Not Rated Total Agency obligations $ 8,998 — — — — 8,998 Mortgage-backed securities 50 — — — — 50 State and municipal obligations 57,207 308,572 51,678 1,115 10,059 428,631 Corporate obligations — 3,087 7,188 — 25 10,300 $ 66,255 311,659 58,866 1,115 10,084 447,979 December 31, 2020 Total Portfolio AAA AA A BBB Not Rated Total Agency obligations $ 7,600 — — — — 7,600 Mortgage-backed securities 62 — — — — 62 State and municipal obligations 57,830 311,155 53,302 1,115 10,253 433,655 Corporate obligations — 3,255 6,446 — 25 9,726 $ 65,492 314,410 59,748 1,115 10,278 451,043 Credit quality indicators are metrics that provide information regarding the relative credit risk of debt securities. At March 31, 2021, the held to maturity debt securities portfolio was comprised of 15% rated AAA, 70% rated AA, 13% rated A, and less than 2% either below an A rating or not rated by Moody’s Investors Service or Standard and Poor’s. Securities not explicitly rated were grouped where possible under the credit rating of the issuer of the security.

Loans Receivable and Allowance

Loans Receivable and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Loans Receivable and Allowance for Credit Losses	Loans Receivable and Allowance for Credit Losses On January 1, 2020, the Company adopted CECL, which replaced the incurred loss methodology with an expected loss methodology. The adoption of the new standard resulted in the Company recording a $7.9 million increase to the allowance for credit losses on loans with a corresponding cumulative effect adjustment to decrease retained earnings by $5.9 million, net of income taxes. (See Adoption of CECL table below for additional detail.) Loans receivable at March 31, 2021 and December 31, 2020 are summarized as follows (in thousands): March 31, 2021 December 31, 2020 Mortgage loans: Residential $ 1,277,376 1,294,702 Commercial 3,594,012 3,458,666 Multi-family 1,458,193 1,484,515 Construction 615,706 541,939 Total mortgage loans 6,945,287 6,779,822 Commercial loans 2,510,708 2,567,470 Consumer loans 363,648 492,566 Total gross loans 9,819,643 9,839,858 Premiums on purchased loans 1,378 1,566 Unearned discounts (7) (12) Net deferred fees (17,478) (18,522) Total loans $ 9,803,536 9,822,890 At March 31, 2021, $101.7 million of loans purchased from SB One that were previously classified as consumer loans were classified as commercial mortgage loans, following further analysis of the underwriting documents and operational intent of the borrower. These loans are comprised of term loans and lines of credit secured by 1-4 family residential properties that are held by borrowers to generate rental income. The following tables summarize the aging of loans receivable by portfolio segment and class of loans (in thousands): March 31, 2021 30-59 Days 60-89 Days Non-accrual Recorded Total Past Current Total Loans Non-accrual loans with no related allowance Mortgage loans: Residential $ 6,862 6,161 7,797 — 20,820 1,256,556 1,277,376 7,797 Commercial 2,183 520 33,742 — 36,445 3,557,567 3,594,012 33,742 Multi-family 1,327 — 101 — 1,428 1,456,765 1,458,193 101 Construction 1,123 1,656 1,392 — 4,171 611,535 615,706 1,392 Total mortgage loans 11,495 8,337 43,032 — 62,864 6,882,423 6,945,287 43,032 Commercial loans 393 235 36,042 — 36,670 2,474,038 2,510,708 21,298 Consumer loans 1,356 277 3,010 — 4,643 359,005 363,648 3,009 Total gross loans $ 13,244 8,849 82,084 — 104,177 9,715,466 9,819,643 67,339 December 31, 2020 30-59 Days 60-89 Days Non-accrual Recorded Total Past Current Total Loans Receivable Non-accrual loans with no related allowance Mortgage loans: Residential $ 15,789 8,852 9,315 — 33,956 1,260,746 1,294,702 9,315 Commercial 761 113 31,982 — 32,856 3,425,810 3,458,666 20,482 Multi-family 206 585 — — 791 1,483,724 1,484,515 — Construction — — 1,392 — 1,392 540,547 541,939 1,392 Total mortgage loans 16,756 9,550 42,689 — 68,995 6,710,827 6,779,822 31,189 Commercial loans 1,658 1,179 42,118 — 44,955 2,522,515 2,567,470 15,541 Consumer loans 4,348 4,519 2,283 — 11,150 481,416 492,566 2,283 Total gross loans $ 22,762 15,248 87,090 — 125,100 9,714,758 9,839,858 49,013 Included in loans receivable are loans for which the accrual of interest income has been discontinued due to deterioration in the financial condition of the borrowers. The principal amounts of these non-accrual loans were $82.1 million and $87.1 million at March 31, 2021 and December 31, 2020, respectively. Included in non-accrual loans were $27.1 million and $35.3 million of loans which were less than 90 days past due at March 31, 2021 and December 31, 2020, respectively. There were no loans 90 days or greater past due and still accruing interest at March 31, 2021 or December 31, 2020. Management has elected to measure an allowance for credit losses for accrued interest receivables specifically related to any loan that has been deferred as a result of COVID-19. Generally, accrued interest is written off by reversing interest income during the quarter the loan is moved from an accrual to a non-accrual status. The Company defines an impaired loan as a non-homogeneous loan greater than $1.0 million, for which, based on current information, the Bank does not expect to collect all amounts due under the contractual terms of the loan agreement. Impaired loans also include all loans modified as troubled debt restructurings (“TDRs”). An allowance for collateral-dependent impaired loans that have been modified in a TDR is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the estimated fair value of the collateral, less any selling costs. The Company uses third-party appraisals to determine the fair value of the underlying collateral in its analysis of collateral-dependent loans. A third-party appraisal is generally ordered as soon as a loan is designated as a collateral-dependent loan and updated annually, or more frequently if required. A financial asset is considered collateral-dependent when the debtor is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. For all classes of loans deemed collateral-dependent, the Company estimates expected credit losses based on the fair value of the collateral less any selling costs. A specific allocation of the allowance for credit losses is established for each collateral-dependent loan with a carrying balance greater than the collateral’s fair value, less estimated selling costs. In most cases, the Company records a partial charge-off to reduce the loan’s carrying value to the collateral’s fair value less estimated selling costs. At each fiscal quarter end, if a loan is designated as collateral-dependent and the third-party appraisal has not yet been received, an evaluation of all available collateral is made using the best information available at the time, including rent rolls, borrower financial statements and tax returns, prior appraisals, management’s knowledge of the market and collateral, and internally prepared collateral valuations based upon market assumptions regarding vacancy and capitalization rates, each as and where applicable. Once the appraisal is received and reviewed, the specific reserves are adjusted to reflect the appraised value and evaluated for charge offs. The Company believes there have been no significant time lapses resulting from this process. At March 31, 2021, there were 167 impaired loans totaling $79.5 million. Included in this total were 115 TDRs related to 112 borrowers totaling $22.7 million that were performing in accordance with their restructured terms and which continued to accrue interest at March 31, 2021. At December 31, 2020, there were 169 impaired loans totaling $86.0 million, of which 135 loans totaling $39.6 million were TDRs. Included in this total were 112 TDRs to 110 borrowers totaling $23.1 million that were performing in accordance with their restructured terms and which continued to accrue interest at December 31, 2020. At March 31, 2021 and December 31, 2020, the Company had $30.1 million and $26.3 million of collateral-dependent impaired loans, respectively. The collateral-dependent impaired loans at March 31, 2021 consisted of $28.3 million in commercial loans, $1.6 million in residential real estate loans, and $216,000 in consumer loans. The collateral for these impaired loans was primarily real estate. The activity in the allowance for credit losses by portfolio segment for the three months ended March 31, 2021 and 2020 was as follows (in thousands): March 31, 2021 Mortgage loans Commercial loans Consumer loans Total Balance at beginning of period $ 68,307 27,084 6,075 101,466 Provision benefit to operations (13,467) (467) (1,066) (15,000) Recoveries of loans previously charged-off 276 528 303 1,107 Loans charged-off (918) (843) (221) (1,982) Balance at end of period $ 54,198 26,302 5,091 85,591 March 31, 2020 Mortgage loans Commercial loans Consumer loans Total Balance at beginning of period $ 25,511 28,263 1,751 55,525 Provision charge (benefit) to operations 7,710 7,619 (629) 14,700 Retained earnings (due to initial CECL adoption) 14,188 (9,974) 3,706 7,920 Recoveries of loans previously charged-off 93 313 123 529 Loans charged-off (2) (3,380) (149) (3,531) Balance at end of period $ 47,500 22,841 4,802 75,143 As a result of the January 1, 2020 adoption of CECL, the Company recorded a $7.9 million increase to the allowance for credit losses on loans. For the three months ended March 31, 2021, the Company recorded a negative provision for credit losses on loans of $15.0 million. The decrease in the provision for credit losses for the year ended March 31, 2021 was the result of an improved current economic forecast and the resultant favorable impact on expected credit losses, compared with a provision for credit losses for the prior year, which was based upon a weak economic forecast and uncertain outlook attributable to the COVID-19. The largest decrease in the provision for credit losses on loans for the year ended March 31, 2021 was in the commercial real estate portfolio. The following table illustrates the impact the January 1, 2020 adoption of CECL had on the allowance for credits losses for the loan portfolio (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Loans Residential $ 8,950 3,414 5,536 Commercial 17,118 12,831 4,287 Multi-family 9,519 3,374 6,145 Construction 4,152 5,892 (1,740) Total mortgage loans 39,739 25,511 14,228 Commercial loans 18,254 28,263 (10,009) Consumer loans 5,452 1,751 3,701 Allowance for credit losses on loans $ 63,445 55,525 7,920 The following tables summarize loans receivable by portfolio segment and impairment method (in thousands): March 31, 2021 Mortgage Commercial Consumer Total Portfolio Individually evaluated for impairment $ 49,783 28,359 1,405 79,547 Collectively evaluated for impairment 6,895,504 2,482,349 362,243 9,740,096 Total gross loans $ 6,945,287 2,510,708 363,648 9,819,643 December 31, 2020 Mortgage Commercial Consumer Total Portfolio Individually evaluated for impairment $ 48,783 35,832 1,431 86,046 Collectively evaluated for impairment 6,731,039 2,531,638 491,135 9,753,812 Total gross loans $ 6,779,822 2,567,470 492,566 9,839,858 The allowance for credit losses is summarized by portfolio segment and impairment classification as follows (in thousands): March 31, 2021 Mortgage Commercial loans Consumer loans Total Individually evaluated for impairment $ 927 3,832 43 4,802 Collectively evaluated for impairment 53,271 22,470 5,048 80,789 Total gross loans $ 54,198 26,302 5,091 85,591 December 31, 2020 Mortgage Commercial loans Consumer Total Individually evaluated for impairment $ 4,220 4,715 39 8,974 Collectively evaluated for impairment 64,087 22,369 6,036 92,492 Total gross loans $ 68,307 27,084 6,075 101,466 Loan modifications to borrowers experiencing financial difficulties that are considered TDRs primarily involve lowering the monthly payments on such loans through either a reduction in interest rate below a market rate, an extension of the term of the loan without a corresponding adjustment to the risk premium reflected in the interest rate, or a combination of these two methods. These modifications generally do not result in the forgiveness of principal or accrued interest. In addition, management attempts to obtain additional collateral or guarantor support when modifying such loans. If the borrower has demonstrated performance under the previous terms and our underwriting process shows the borrower has the capacity to continue to perform under the restructured terms, the loan will continue to accrue interest. Non-accruing restructured loans may be returned to accrual status when there has been a sustained period of repayment performance (generally six consecutive months of payments) and both principal and interest are deemed collectible. The following tables present the number of loans modified as TDRs during the three months ended March 31, 2021 and 2020, along with their balances immediately prior to the modification date and post-modification as of March 31, 2021 and 2020 (in thousands): For the three months ended March 31, 2021 March 31, 2020 Troubled Debt Restructurings Number of Pre-Modification Post-Modification Number of Pre-Modification Post-Modification ($ in thousands) Commercial loans 3 $ 1,361 $ 1,359 2 $ 746 $ 731 Total restructured loans 3 $ 1,361 $ 1,359 2 $ 746 $ 731 For loans modified as TDRs in the preceding table, there were no allowance for credit losses required at March 31, 2021. There were no payment defaults (90 days or more past due) at the quarter ended March 31, 2021 and 2020 for loans modified as TDRs within the previous 12 month periods ending March 31, 2021 and March 31, 2020. For TDRs that subsequently default, the Company determines the amount of the allowance for the respective loans in accordance with the accounting policy for the allowance for credit losses on loans individually evaluated for impairment. All TDRs are impaired loans, which are individually evaluated for impairment. During the three months ended March 31, 2021, $1.5 million of charge-offs were recorded on TDRs. (See subsequent discussion related to COVID-19 loan modifications.) As allowed by CECL, the Company elected to maintain pools of loans accounted for under ASC 310-30. At December 31, 2020, purchased credit impaired (“PCI”) loans totaled $746,000. In accordance with the CECL standard, management did not reassess whether modifications of individually acquired financial assets accounted for in pools were TDRs as of the date of adoption. Loans considered to be PCI prior to January 1, 2020 were converted to PCD loans on that date. Any additional loans acquired by the Company after January 1, 2020, that experience more-than-insignificant deterioration in credit quality after origination, have been classified as PCD loans. The table below is a summary of the PCD loans accounted for in accordance with ASC 310-26 that were acquired in the SB One acquisition at the July 31, 2020 closing date (in thousands): Gross amortized cost basis at July 31, 2020 $ 315,784 Interest component of expected cash flows (accretable difference) (7,988) Fair value of PCD loans 307,796 Allowance for credit losses on PCD loans (13,586) Net PCD loans $ 294,210 At March 31, 2021, the balance of PCD loans totaled $283.9 million with a related allowance for credit losses of $10.8 million. The balance of PCD loans at December 31, 2020 was $296.6 million with a related allowance for credit losses of $13.1 million. The following table presents loans individually evaluated for impairment by class and loan category (in thousands): March 31, 2021 December 31, 2020 Unpaid Principal Balance Recorded Investment Related Allowance Average Recorded Investment Interest Income Recognized Unpaid Principal Balance Recorded Investment Related Allowance Average Recorded Investment Interest Income Recognized Loans with no related allowance Mortgage loans: Residential $ 12,267 9,794 — 10,083 118 13,981 11,380 — 11,587 511 Commercial 34,125 30,656 — 31,555 17 17,414 17,414 — 16,026 60 Total 46,392 40,450 — 41,638 135 31,395 28,794 — 27,613 571 Commercial loans 11,630 8,963 — 9,082 — 15,895 14,009 — 12,791 46 Consumer loans 1,360 857 — 2,319 13 1,382 880 — 7 50 Total impaired loans $ 59,382 50,270 — 53,039 148 48,672 43,683 — 40,411 667 Loans with an allowance recorded Mortgage loans: Residential $ 8,938 8,438 904 8,461 77 7,950 7,506 806 7,604 307 Commercial 895 895 23 925 13 14,993 12,483 3,414 123 570 Total 9,833 9,333 927 9,386 90 22,943 19,989 4,220 7,727 877 Commercial loans 22,622 19,396 3,832 23,451 123 24,947 21,823 4,715 18,620 311 Consumer loans 563 548 43 550 10 565 551 39 5 20 Total impaired loans $ 33,018 29,277 4,802 33,387 223 48,455 42,363 8,974 26,352 1,208 Total impaired loans Mortgage loans: Residential $ 21,205 18,232 904 18,544 195 21,931 18,886 806 19,191 818 Commercial 35,020 31,551 23 32,480 30 32,407 29,897 3,414 16,149 630 Total 56,225 49,783 927 51,024 225 54,338 48,783 4,220 35,340 1,448 Commercial loans 34,252 28,359 3,832 32,533 123 40,842 35,832 4,715 31,411 357 Consumer loans 1,923 1,405 43 2,869 23 1,947 1,431 39 12 70 Total impaired loans $ 92,400 79,547 4,802 86,426 371 97,127 86,046 8,974 66,763 1,875 Specific allocations of the allowance for credit losses attributable to impaired loans totaled $4.8 million at March 31, 2021 and $9.0 million at December 31, 2020. At March 31, 2021 and December 31, 2020, impaired loans for which there was no related allowance for credit losses totaled $50.3 million and $43.7 million, respectively. The average balance of impaired loans for the three months ended March 31, 2021 and December 31, 2020 was $86.4 million and $66.8 million, respectively. Management utilizes an internal nine-point risk rating system to summarize its loan portfolio into categories with similar risk characteristics. Loans deemed to be “acceptable quality” are rated 1 through 4, with a rating of 1 established for loans with minimal risk. Loans that are deemed to be of “questionable quality” are rated 5 (watch) or 6 (special mention). Loans with adverse classifications (substandard, doubtful or loss) are rated 7, 8 or 9, respectively. Commercial mortgage, commercial, multi-family and construction loans are rated individually, and each lending officer is responsible for risk rating loans in their portfolio. These risk ratings are then reviewed by the department manager and/or the Chief Lending Officer and by the Credit Department. The risk ratings are also confirmed through periodic loan review examinations which are currently performed by an independent third-party. Reports by the independent third-party are presented directly to the Audit Committee of the Board of Directors. In response to COVID-19 and its adverse economic impact on both our commercial and retail borrowers, the Company implemented a modification program to defer principal or principal and interest payments for borrowers directly impacted by the pandemic and who were not more than 30 days past due as of December 31, 2019, all in accordance with the Coronavirus Aid, Relief, and Economic Security ("CARES") Act. Loans that have been or are expected to be granted COVID-19 related deferrals or modifications have decreased from a peak level of $1.31 billion, or 16.8% of loans, to $132.0 million, or 1.3% of loans a s of April 20, 2021. This $132.0 million of loans includes $300,000 in a first 90-day deferral period, $46.6 million in a second 90-day deferral period, and $85.1 million in a third deferral period. Of the $123.5 million in commercial loans in deferral, $119.0 million or 96.4% are under principal only deferral and are paying interest. Included in the $132.0 million of loans, $40.9 million are secured by hotels, $33.1 million are secured by multi-family properties (the majority of which is student housing related), $8.6 million are secured by retail properties, $6.5 million are secured by restaurants, and $8.5 million are secured by residential mortgages, with the balance comprised of diverse commercial loans. In accordance with the CARES Act, the Company has elected to not apply troubled debt restructuring classification to any COVID-19 related loan modifications that were performed after March 1, 2020 to borrowers who were current as of December 31, 2019. Accordingly, these modifications are not classified as TDRs. In addition, the Company participated in the Paycheck Protection Program (“PPP”) through the United States Department of the Treasury and Small Business Administration ("SBA"). As of March 31, 2021, the Company secured a total of 1,318 PPP loans for its customers totaling $664.5 million, which includes both the initial round and the second round of PPP. Additionally, as of March 31, 2021, 670 PPP loans totaling $182.6 million were forgiven. The balance at March 31, 2021 for PPP loans was $481.9 million. The PPP loans are fully guaranteed by the SBA and may be eligible for forgiveness by the SBA to the extent that the proceeds are used to cover eligible payroll costs, interest costs, rent, and utility costs over a period of up to 24 weeks after the loan was made as long as certain conditions are met regarding employee retention and compensation levels. PPP loans deemed eligible for forgiveness by the SBA will be repaid by the SBA to the Company. PPP loans are included in the commercial loan portfolio. The following table summarizes the Company's gross loans held for investment by year of origination and internally assigned credit grades (in thousands): At March 31, 2021 Total portfolio Residential Commercial mortgage Multi-family Construction Total Commercial Consumer Total Loans (1) Special mention $ 5,847 129,051 35,885 25,409 196,192 115,619 529 312,340 Substandard 23,416 109,689 1,552 5,736 140,393 124,581 3,836 268,810 Doubtful — — — — — 20 — 20 Loss — — — — — — — — Total criticized and classified 29,263 238,740 37,437 31,145 336,585 240,220 4,365 581,170 Pass/Watch 1,248,113 3,355,272 1,420,756 584,561 6,608,702 2,270,488 359,283 9,238,473 Total $ 1,277,376 3,594,012 1,458,193 615,706 6,945,287 2,510,708 363,648 9,819,643 2021 Special mention $ — — — — — 23 — 23 Substandard — — — — — 391 — 391 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified — — — — — 414 — 414 Pass/Watch 82,831 78,552 31,141 14,913 207,437 252,045 8,947 468,429 Total gross loans $ 82,831 78,552 31,141 14,913 207,437 252,459 8,947 468,843 2020 Special mention $ — $ — $ — $ 1,986 $ 1,986 $ 345 $ — $ 2,331 Substandard 163 — — — 163 1,824 — 1,987 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 163 — — 1,986 2,149 2,169 — 4,318 Pass/Watch 262,032 670,040 296,124 123,927 1,352,123 595,559 39,107 1,986,789 Total gross loans $ 262,195 670,040 296,124 125,913 1,354,272 597,728 39,107 1,991,107 2019 Special mention $ 661 30,310 679 16,189 47,839 8,819 — 56,658 Substandard 3,773 2,426 — — 6,199 9,856 361 16,416 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 4,434 32,736 679 16,189 54,038 18,675 361 73,074 Pass/Watch 139,951 632,084 177,648 259,223 1,208,906 246,072 46,155 1,501,133 Total gross loans $ 144,385 664,820 178,327 275,412 1,262,944 264,747 46,516 1,574,207 2018 Special mention $ 2,425 39,825 20,125 — 62,375 3,578 — 65,953 Substandard 744 5,383 — 5,121 11,248 6,568 120 17,936 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 3,169 45,208 20,125 5,121 73,623 10,146 120 83,889 Pass/Watch 81,320 385,080 183,343 145,307 795,050 228,963 44,128 1,068,141 Total gross loans $ 84,489 430,288 203,468 150,428 868,673 239,109 44,248 1,152,030 2017 and prior Special mention $ 2,761 58,916 15,081 7,234 83,992 102,854 529 187,375 Substandard 18,736 101,880 1,552 615 122,783 105,942 3,355 232,080 Doubtful — — — — — 20 — 20 Loss — — — — — — — — Total criticized and classified 21,497 160,796 16,633 7,849 206,775 208,816 3,884 419,475 Pass/Watch 681,979 1,589,516 732,500 41,191 3,045,186 947,849 220,946 4,213,981 Total gross loans $ 703,476 1,750,312 749,133 49,040 3,251,961 1,156,665 224,830 4,633,456 At December 31, 2020 Residential Commercial mortgage Multi-family Construction Total Commercial Consumer Total loans Special mention $ 2,882 124,631 29,781 24,376 181,670 157,080 1,867 340,617 Substandard 26,651 98,313 1,568 4,924 131,456 127,092 6,746 265,294 Doubtful — — — — — 52 — 52 Loss — — — — — — — — Total criticized and classified 29,533 222,944 31,349 29,300 313,126 284,224 8,613 605,963 Pass/Watch 1,265,169 3,235,722 1,453,166 512,639 6,466,696 2,283,246 483,953 9,233,895 Total $ 1,294,702 3,458,666 1,484,515 541,939 6,779,822 2,567,470 492,566 9,839,858 (1) Contained within criticized and classified loans at March 31, 2021 are loans that were granted payment deferrals related to COVID-19 totaling $132.0 million.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2021
Banking and Thrift, Other Disclosures [Abstract]
Deposits	Deposits Deposits at March 31, 2021 and December 31, 2020 are summarized as follows (in thousands): March 31, 2021 December 31, 2020 Savings $ 1,402,363 1,348,147 Money market 2,345,640 2,245,412 NOW 3,075,098 2,808,637 Non-interest bearing 2,511,408 2,341,459 Certificates of deposit 963,004 1,094,174 Total deposits $ 10,297,513 9,837,829

Components of Net Periodic Bene

Components of Net Periodic Benefit Cost	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Components of Net Periodic Benefit Cost	Components of Net Periodic Benefit Cost The Bank has a noncontributory defined benefit pension plan covering its full-time employees who had attained age 21 with at least one year of service as of April 1, 2003. The pension plan was frozen on April 1, 2003. All participants in the Plan are 100% vested. The pension plan’s assets are invested in investment funds and group annuity contracts currently managed by the Principal Financial Group and Allmerica Financial. In addition to pension benefits, certain health care and life insurance benefits are currently made available to certain of the Bank’s retired employees. The costs of such benefits are accrued based on actuarial assumptions from the date of hire to the date the employee is fully eligible to receive the benefits. Effective January 1, 2003, eligibility for retiree health care benefits was frozen as to new entrants, and benefits were eliminated for employees with less than ten years of service as of December 31, 2002. Effective January 1, 2007, eligibility for retiree life insurance benefits was frozen as to new entrants and retiree life insurance benefits were eliminated for employees with less than ten years of service as of December 31, 2006. Net periodic (benefit) increase cost for pension benefits and other post-retirement benefits for the three months ended March 31, 2021 and 2020 includes the following components (in thousands): Three months ended March 31, Pension benefits Other post-retirement benefits 2021 2020 2021 2020 Service cost $ — — 9 20 Interest cost 198 250 106 178 Expected return on plan assets (807) (737) — — Amortization of prior service cost — — — — Amortization of the net loss (gain) 118 174 (268) (62) Net periodic (benefit) increase cost $ (491) (313) (153) 136 In its consolidated financial statements for the year ended December 31, 2020, the Company previously disclosed that it does not expect to contribute to the pension plan in 2021. As of March 31, 2021, no contributions have been made to the pension plan. The net periodic (decrease) increase in benefit cost for pension benefits and other post-retirement benefits for the three months ended March 31, 2021 were calculated using the January 1, 2021 pension and other post-retirement benefits actuarial valuations.

Impact of Recent Accounting Pro

Impact of Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2021
Accounting Changes and Error Corrections [Abstract]
Impact of Recent Accounting Pronouncements	Impact of Recent Accounting PronouncementsAccounting Pronouncements Not Yet AdoptedASU 2020-04, "Reference Rate Reform (Topic 848)" ("ASU 2020-04") provides optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. For transactions that are modified because of reference rate reform and that meet certain scope guidance: (i) modifications of loan agreements should be accounted for by prospectively adjusting the effective interest rate and the modification will be considered "minor" so that any existing unamortized origination fees/costs would carry forward and continue to be amortized; and (ii) modifications of lease agreements should be accounted for as a continuation of the existing agreement with no reassessments of the lease classification and the discount rate or re-measurements of lease payments that otherwise would be required for modifications not accounted for as separate contracts. ASU 2020-04 also provides numerous optional expedients for derivative accounting. ASU 2020-04 is effective March 12, 2020 through December 31, 2022. An entity may elect to apply ASU 2020-04 for contract modifications as of January 1, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020, up to the date that the financial statements are available to be issued. Once elected for a Topic or an Industry Subtopic within the Codification, the amendments in this ASU must be applied prospectively for all eligible contract modifications for that Topic or Industry Subtopic. The Company anticipates this ASU will simplify any modifications we execute between the selected start date (yet to be determined) and December 31, 2022 that are directly related to LIBOR transition by allowing prospective recognition of the continuation of the contract, rather than the extinguishment of the old contract resulting in writing off unamortized fees/costs. In addition, in January 2021 the FASB issued ASU No. 2021-01 “Reference Rate Reform — Scope,” which clarified the scope of ASC 848 relating to contract modifications. The Company is evaluating the impacts of this guidance and has not determined whether LIBOR transition and this guidance will have material effects on the Company's business operations and consolidated financial statements.

Allowance for Credit Losses on

Allowance for Credit Losses on Off-Balance Sheet Credit Exposures	3 Months Ended
	Mar. 31, 2021
Credit Loss [Abstract]
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures	Allowance for Credit Losses on Off-Balance Sheet Credit Exposures On January 1, 2020, the Company adopted CECL, which replaced the incurred loss methodology with an expected loss methodology. This new methodology applies to off-balance sheet credit exposures, including loan commitments and lines of credit. The adoption of this new standard resulted in the Company recording a $3.2 million increase to the allowance for credit losses on off-balance sheet credit exposures with a corresponding cumulative effect adjustment to decrease retained earnings $2.4 million, net of income taxes. Management analyzes the Company's exposure to credit losses for both on-balance sheet and off-balance sheet activity using a consistent methodology for the quantitative framework as well as the qualitative framework. For purposes of estimating the allowance for credit losses for off-balance sheet credit exposures, the exposure at default includes an estimated drawdown of unused credit based on historical credit utilization factors and current loss factors, resulting in a proportionate amount of expected credit losses. The following table illustrates the impact of the January 1, 2020 adoption of CECL on off-balance sheet credit exposures: January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Liabilities Allowance for credit losses on off-balance sheet credit exposure $ 3,206 — 3,206 For the three months ended March 31, 2021, the Company recorded an $875,000 benefit to the provision for credit losses for off-balance sheet credit exposures, compared to $1.0 million provision for the three months ended March 31, 2020. This decrease in the provision for credit losses for off-balance sheet credit exposures was primarily due to a reduction in the required allowance for these exposures as loss factors decreased resulting from an improved economic forecast compared to the prior year. The allowance for credit losses for off-balance sheet credit exposures was $4.1 million and $5.0 million at March 31, 2021 and December 31, 2020, respectively, and are included in other liabilities on the Consolidated Statements of Financial Condition.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value MeasurementsThe Company utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The determination of fair values of financial instruments often requires the use of estimates. Where quoted market values in an active market are not readily available, Management utilizes various valuation techniques to estimate fair value. Fair value is an estimate of the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. However, in many instances fair value estimates may not be substantiated by comparison to independent markets and may not be realized in an immediate sale of the financial instrument. GAAP 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 as follows: Level 1: Unadjusted quoted market 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; and 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. The valuation techniques are based upon the unpaid principal balance only, and exclude any accrued interest or dividends at the measurement date. Interest income and expense and dividend income are recorded within the consolidated statements of income depending on the nature of the instrument using the effective interest method based on acquired discount or premium. Assets and Liabilities Measured at Fair Value on a Recurring Basis The valuation techniques described below were used to measure fair value of financial instruments in the table below on a recurring basis as of March 31, 2021 and December 31, 2020. Available for Sale Debt Securities, at Fair Value For available for sale debt securities, fair value was estimated using a market approach. The majority of the Company’s securities are fixed income instruments that are not quoted on an exchange, but are traded in active markets. Prices for these instruments are obtained through third-party data service providers or dealer market participants with whom the Company has historically transacted both purchases and sales of securities. Prices obtained from these sources include market quotations and matrix pricing. Matrix pricing, a Level 2 input, is a mathematical technique used principally to value certain securities to benchmark to comparable securities. The Company evaluates the quality of Level 2 matrix pricing through comparison to similar assets with greater liquidity and evaluation of projected cash flows. As Management is responsible for the determination of fair value, it performs quarterly analyses on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, Management compares the prices received from the pricing service to a secondary pricing source. Additionally, Management compares changes in the reported market values and returns to relevant market indices to test the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has generally not resulted in an adjustment in the prices obtained from the pricing service. Equity Securities, at Fair Value The Company holds equity securities that are traded in active markets with readily accessible quoted market prices that are considered Level 1 inputs. Derivatives The Company records all derivatives on the statements of financial condition at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. The Company has interest rate derivatives resulting from a service provided to certain qualified borrowers in a loan related transaction which, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. As such, all changes in fair value of the Company’s derivatives are recognized directly in earnings. The Company also uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges, and which satisfy hedge accounting requirements, involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. These derivatives were used to hedge the variable cash outflows associated with FHLBNY borrowings. The change in the fair value of these derivatives is recorded in accumulated other comprehensive income, and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. The fair value of the Company's derivatives is determined using discounted cash flow analysis using observable market-based inputs, which are considered Level 2 inputs. Assets Measured at Fair Value on a Non-Recurring Basis The valuation techniques described below were used to estimate fair value of financial instruments measured on a non-recurring basis as of March 31, 2021 and December 31, 2020. Collateral-Dependent Impaired Loans For loans measured for impairment based on the fair value of the underlying collateral, fair value was estimated using a market approach. The Company measures the fair value of collateral underlying impaired loans primarily through obtaining independent appraisals that rely upon quoted market prices for similar assets in active markets. These appraisals include adjustments, on an individual case-by-case basis, to comparable assets based on the appraisers’ market knowledge and experience, as well as adjustments for estimated costs to sell between 5% and 10%. Management classifies these loans as Level 3 within the fair value hierarchy. Foreclosed Assets Assets acquired through foreclosure or deed in lieu of foreclosure are carried at fair value, less estimated selling costs, which range between 5% and 10%. Fair value is generally based on independent appraisals that rely upon quoted market prices for similar assets in active markets. These appraisals include adjustments, on an individual case basis, to comparable assets based on the appraisers’ market knowledge and experience, and are classified as Level 3. When an asset is acquired, the excess of the loan balance over fair value less estimated selling costs is charged to the allowance for credit losses. A reserve for foreclosed assets may be established to provide for possible write-downs and selling costs that occur subsequent to foreclosure. Foreclosed assets are carried net of the related reserve. Operating results from real estate owned, including rental income, operating expenses, and gains and losses realized from the sales of real estate owned, are recorded as incurred. There were no changes to the valuation techniques for fair value measurements as of March 31, 2021 and December 31, 2020. The following tables present the assets and liabilities reported on the consolidated statements of financial condition at their fair values as of March 31, 2021 and December 31, 2020, by level within the fair value hierarchy (in thousands): Fair Value Measurements at Reporting Date Using: March 31, 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured on a recurring basis: Available for sale debt securities: Mortgage-backed securities $ 1,060,152 — 1,060,152 — Asset-backed securities 49,205 — 49,205 — State and municipal obligations 68,934 — 68,934 — Corporate obligations 38,645 — 38,645 — Total available for sale debt securities 1,216,936 — 1,216,936 — Equity securities 1,026 1,026 — — Derivative assets 76,542 — 76,542 — $ 1,294,504 1,026 1,293,478 — Derivative liabilities $ 78,228 — 78,228 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 30,120 — — 30,120 Foreclosed assets 3,554 — — 3,554 $ 33,674 — — 33,674 Fair Value Measurements at Reporting Date Using: December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured on a recurring basis: Available for sale debt securities: Agency obligations $ 1,009 1,009 — — Mortgage-backed securities 938,413 — 938,413 — Asset-backed securities 53,830 53,830 State and municipal obligations 71,258 — 71,258 — Corporate obligations 40,979 — 40,979 — Total available for sale debt securities 1,105,489 1,009 1,104,480 — Equity Securities 971 971 — — Derivative assets 101,079 — 101,079 — $ 1,207,539 1,980 1,205,559 — Derivative liabilities $ 109,148 — 109,148 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 26,250 — — 26,250 Foreclosed assets 4,475 — — 4,475 $ 30,725 — — 30,725 There were no transfers between Level 1, Level 2 and Level 3 during the three months ended March 31, 2021. Other Fair Value Disclosures The Company is required to disclose estimated fair value of financial instruments, both assets and liabilities on and off the balance sheet, for which it is practicable to estimate fair value. The following is a description of valuation methodologies used for those assets and liabilities. Cash and Cash Equivalents For cash and due from banks, federal funds sold and short-term investments, the carrying amount approximates fair value. Included in cash and cash equivalents at March 31, 2021 and December 31, 2020 was $42.6 million and $114.3 million, respectively, representing cash collateral pledged to secure loan level swaps and reserves required by banking regulations. Held to Maturity Debt Securities For held to maturity debt securities, fair value was estimated using a market approach. The majority of the Company’s securities are fixed income instruments that are not quoted on an exchange, but are traded in active markets. Prices for these instruments are obtained through third party data service providers or dealer market participants with whom the Company has historically transacted both purchases and sales of securities. Prices obtained from these sources include market quotations and matrix pricing. Matrix pricing, a Level 2 input, is a mathematical technique used principally to value certain securities to benchmark to comparable securities. Management evaluates the quality of Level 2 matrix pricing through comparison to similar assets with greater liquidity and evaluation of projected cash flows. As management is responsible for the determination of fair value, it performs quarterly analyses on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, management compares the prices received from the pricing service to a secondary pricing source. Additionally, management compares changes in the reported market values and returns to relevant market indices to test the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has generally not resulted in adjustment in the prices obtained from the pricing service. The Company also holds debt instruments issued by the U.S. government and U.S. government agencies that are traded in active markets with readily accessible quoted market prices that are considered Level 1 within the fair value hierarchy. Federal Home Loan Bank of New York ("FHLBNY") Stock The carrying value of FHLBNY stock is its cost. The fair value of FHLBNY stock is based on redemption at par value. The Company classifies the estimated fair value as Level 1 within the fair value hierarchy. Loans Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial mortgage, residential mortgage, commercial, construction and consumer. Each loan category is further segmented into fixed and adjustable rate interest terms and into performing and non-performing categories. The fair value of performing loans was estimated using a combination of techniques, including a discounted cash flow model that utilizes a discount rate that reflects the Company’s current pricing for loans with similar characteristics and remaining maturity, adjusted by an amount for estimated credit losses inherent in the portfolio at the balance sheet date (i.e. exit pricing). The rates take into account the expected yield curve, as well as an adjustment for prepayment risk, when applicable. The Company classifies the estimated fair value of its loan portfolio as Level 3. The fair value for significant non-performing loans was based on recent external appraisals of collateral securing such loans, adjusted for the timing of anticipated cash flows. The Company classifies the estimated fair value of its non-performing loan portfolio as Level 3. Deposits The fair value of deposits with no stated maturity, such as non-interest bearing demand deposits and savings deposits, was equal to the amount payable on demand and classified as Level 1. The estimated fair value of certificates of deposit was based on the discounted value of contractual cash flows. The discount rate was estimated using the Company’s current rates offered for deposits with similar remaining maturities. The Company classifies the estimated fair value of its certificates of deposit portfolio as Level 2. Borrowed Funds The fair value of borrowed funds was estimated by discounting future cash flows using rates available for debt with similar terms and maturities and is classified by the Company as Level 2 within the fair value hierarchy. Commitments to Extend Credit and Letters of Credit The fair value of commitments to extend credit and letters of credit was estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties. For fixed rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. Limitations Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on- and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Significant assets and liabilities that are not considered financial assets or liabilities include goodwill and other intangibles, deferred tax assets and premises and equipment. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates. The following tables present the Company’s financial instruments at their carrying and fair values as of March 31, 2021 and December 31, 2020. Fair values are presented by level within the fair value hierarchy. Fair Value Measurements at March 31, 2021 Using: (Dollars in thousands) Carrying value Fair value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 687,570 687,570 687,570 — — Available for sale debt securities: Mortgage-backed securities 1,060,152 1,060,152 — 1,060,152 — Asset-backed securities 49,205 49,205 49,205 State and municipal obligations 68,934 68,934 — 68,934 — Corporate obligations 38,645 38,645 — 38,645 — Total available for sale debt securities $ 1,216,936 1,216,936 — 1,216,936 — Held to maturity debt securities, net of allowance for credit losses: Agency obligations 8,998 8,904 8,904 — — Mortgage-backed securities 50 51 — 51 — State and municipal obligations 428,571 444,776 — 444,776 — Corporate obligations 10,283 10,262 — 10,262 — Total held to maturity debt securities, net of allowance for credit losses $ 447,902 463,993 8,904 455,089 — FHLBNY stock 48,998 48,998 48,998 — — Equity Securities 1,026 1,026 1,026 — — Loans, net of allowance for credit losses 9,717,945 9,857,891 — — 9,857,891 Derivative assets 76,542 76,542 — 76,542 — Financial liabilities: Deposits other than certificates of deposits $ 9,334,509 9,334,509 9,334,509 — — Certificates of deposit 963,004 967,088 — 967,088 — Total deposits $ 10,297,513 10,301,597 9,334,509 967,088 — Borrowings 940,611 945,538 — 945,538 — Subordinated debentures 25,173 30,325 — 30,325 — Derivative liabilities 78,228 78,228 — 78,228 — Fair Value Measurements at December 31, 2020 Using: (Dollars in thousands) Carrying value Fair value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 532,353 532,353 532,353 — — Available for sale debt securities: U.S. Treasury obligations — — — — Agency obligations 1,009 1,009 1,009 — — Mortgage-backed securities 938,413 938,413 — 938,413 — Asset-backed securities 53,830 53,830 53,830 State and municipal obligations 71,258 71,258 — 71,258 — Corporate obligations 40,979 40,979 — 40,979 — Total available for sale debt securities $ 1,105,489 1,105,489 1,009 1,104,480 — Held to maturity debt securities: Agency obligations $ 7,600 7,601 7,601 — — Mortgage-backed securities 62 64 — 64 — State and municipal obligations 433,589 454,973 — 454,973 — Corporate obligations 9,714 9,813 — 9,813 — Total held to maturity debt securities, net of allowance for credit losses $ 450,965 472,451 7,601 464,850 — FHLBNY stock 59,489 59,489 59,489 — — Equity securities 971 971 971 — — Loans, net of allowance for credit losses 9,721,424 9,969,330 — — 9,969,330 Derivative assets 101,079 101,079 — 101,079 — Financial liabilities: Deposits other than certificates of deposits $ 8,743,655 8,743,655 8,743,655 — — Certificates of deposit 1,094,174 1,097,993 — 1,097,993 — Total deposits $ 9,837,829 9,841,648 8,743,655 1,097,993 — Borrowings 1,175,972 1,193,024 — 1,193,024 — Subordinated debentures 25,135 24,375 — 24,375 — Derivative liabilities 109,148 109,148 — 109,148 —

Other Comprehensive Income

Other Comprehensive Income	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Other Comprehensive Income	Other Comprehensive Income The following table presents the components of other comprehensive (loss) income, both gross and net of tax, for the three months ended March 31, 2021 and 2020 (in thousands): Three months ended March 31, 2021 2020 Before Tax After Before Tax After Components of Other Comprehensive (Loss) Income: Unrealized gains and losses on available for sale debt securities: Net unrealized (losses) gains arising during the period $ (12,152) 3,133 (9,019) 22,563 (5,817) 16,746 Reclassification adjustment for gains included in net income (230) 59 (171) — — — Total (12,382) 3,192 (9,190) 22,563 (5,817) 16,746 Unrealized gains (losses) on derivatives (cash flow hedges) 6,226 (1,605) 4,621 (7,697) 1,984 (5,713) Amortization related to post-retirement obligations (150) 41 (109) 112 (28) 84 Total other comprehensive (loss) income $ (6,306) 1,628 (4,678) 14,978 (3,861) 11,117 The following tables present the changes in the components of accumulated other comprehensive income, net of tax, for the three months ended March 31, 2021 and 2020 (in thousands): Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax 2021 2020 Unrealized Post- Retirement Unrealized (Losses) Gains on Derivatives (cash flow hedges) Accumulated Unrealized Gains on Post- Retirement Unrealized Gains (Losses) on Derivatives (cash flow hedges) Accumulated Balance at $ 23,690 (1,081) (4,954) 17,655 8,746 (5,240) 315 3,821 Current - period other comprehensive (loss) income (9,190) (109) 4,621 (4,678) 16,746 84 (5,713) 11,117 Balance at March 31, $ 14,500 (1,190) (333) 12,977 25,492 (5,156) (5,398) 14,938 The following tables summarize the reclassifications from accumulated other comprehensive income (loss) to the consolidated statements of income for the three months ended March 31, 2021 and 2020 (in thousands): Reclassifications From Accumulated Other Comprehensive Amount reclassified from AOCI for the three months ended March 31, Affected line item in the Consolidated 2021 2020 Details of AOCI: Available for sale debt securities: Realized net gains on the sale of securities available for sale $ 230 — Net gain on securities transactions (59) — Income tax expense 171 — Net of tax Post-retirement obligations: Amortization of actuarial (losses) gains $ (150) 112 Compensation and employee benefits (1) 41 (28) Income tax expense Total reclassification $ (109) 84 Net of tax (1) This item is included in the computation of net periodic benefit cost. See Note 6. Components of Net Periodic Benefit Cost.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	Derivative and Hedging Activities The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through the management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of its assets and liabilities. Non-designated Hedges. Derivatives not designated in qualifying hedging relationships are not speculative and result from a service the Company provides to certain qualified commercial borrowers in loan related transactions which, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. The Company may execute interest rate swaps with qualified commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting interest rate swaps that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. The interest rate swap agreement which the Company executes with the commercial borrower is collateralized by the borrower's commercial real estate financed by the Company. As the Company has not elected to apply hedge accounting and these interest rate swaps do not meet the hedge accounting requirements, changes in the fair value of both the customer swaps and the offsetting swaps are recognized directly in earnings. At March 31, 2021 and December 31, 2020, the Company had 174 and 172 loan related interest rate swaps, respectively, with aggregate notional amounts of $2.62 billion and $2.63 billion, respectively. The Company periodically enters into risk participation agreements ("RPAs"), with the Company functioning as either the lead institution, or as a participant when another company is the lead institution on a commercial loan. These RPAs are entered into to manage the credit exposure on interest rate contracts associated with these loan participation agreements. Under the RPAs, the Company will either receive or make a payment in the event the borrower defaults on the related interest rate contract. The Company has minimum collateral posting thresholds with certain of its risk participation counterparties, and has posted collateral of $650,000 against the potential risk of default by the borrower under these agreements. At March 31, 2021 and December 31, 2020, the Company had 13 credit derivatives, with aggregate notional amounts of $131.4 million and $121.7 million, respectively, from participations in interest rate swaps as part of these loan participation arrangements. At March 31, 2021 and December 31, 2020, the fair value of these credit derivatives were $96,000 and $97,000, respectively. Cash Flow Hedges of Interest Rate Risk. The Company’s objective in using interest rate derivatives is to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable payment amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Changes in the fair value of derivatives designated and that qualify as cash flow hedges of interest rate risk are recorded in accumulated other comprehensive income and are subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the three months ended March 31, 2021 and 2020, such derivatives were used to hedge the variable cash outflows associated with borrowings and brokered money market deposits. Amounts reported in accumulated other comprehensive income (loss) related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s borrowings. During the next twelve months, the Company estimates that $3.5 million will be reclassified as an increase to interest expense. As of March 31, 2021, the Company had 14 outstanding interest rate derivatives with an aggregate notional amount of $600.0 million that were each designated as a cash flow hedge of interest rate risk. The tables below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Statements of Financial Condition at March 31, 2021 and December 31, 2020 (in thousands): At March 31, 2021 Asset Derivatives Liability Derivatives Consolidated Statements of Financial Condition Fair Consolidated Statements of Financial Condition Fair Derivatives not designated as a hedging instrument: Interest rate products Other assets $ 74,668 Other liabilities $ 75,740 Credit contracts Other assets 96 Other liabilities — Total derivatives not designated as a hedging instrument $ 74,764 $ 75,740 Derivatives designated as a hedging instrument: Interest rate products Other assets $ 1,778 Other liabilities $ 2,488 Total derivatives designated as a hedging instrument $ 1,778 $ 2,488 At December 31, 2020 Asset Derivatives Liability Derivatives Consolidated Statements of Financial Condition Fair Consolidated Statements of Financial Condition Fair Derivatives not designated as a hedging instrument: Interest rate products Other assets $ 107,652 Other liabilities $ 109,148 Credit contracts Other assets 97 Other liabilities — Total derivatives not designated as a hedging instrument $ 107,749 $ 109,148 Derivatives designated as a hedging instrument: Interest rate products Other assets $ (6,671) Other liabilities $ — Total derivatives designated as a hedging instrument $ (6,671) $ — The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Income during the three months ended March 31, 2021 and 2020 (in thousands). Gain (loss) recognized in income on derivatives for the three months ended Consolidated Statements of Income March 31, 2021 March 31, 2020 Derivatives not designated as a hedging instrument: Interest rate products Other income $ 400 (819) Credit contracts Other income 23 (1) Total $ 423 (820) Derivatives designated as a hedging instrument: Loss recognized in Interest rate products Interest expense $ 879 106 Total $ 879 106 The Company has agreements with certain of its dealer counterparties which contain a provision that if the Company defaults on any of its indebtedness, including a default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be deemed in default on its derivative obligations. In addition, the Company has agreements with certain of its dealer counterparties which contain a provision that if the Company fails to maintain its status as a well or adequately capitalized institution, then the counterparty could terminate the derivative positions and the Company would be required to settle its obligations under the agreements. At March 31, 2021, the Company had four dealer counterparties. The Company had a net liability position with respect to all four of the counterparties. The termination value for this net liability position, which includes accrued interest, was $38.5 million at March 31, 2021. The Company has minimum collateral posting thresholds with certain of its derivative counterparties, and has posted collateral of $42.0 million against its obligations under these agreements. If the Company had breached any of these provisions at March 31, 2021, it could have been required to settle its obligations under the agreements at the termination value.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The Company generates revenue from several business channels. The guidance in ASU 2014-09, Revenue from Contracts with Customers (Topic 606) does not apply to revenue associated with financial instruments, including interest income on loans and investments, which comprise the majority of the Company's revenue. For the three months ended March 31, 2021 and 2020, the out-of-scope revenue related to financial instruments was 82.3% and 84% of the Company's total revenue, respectively. Revenue-generating activities that are within the scope of Topic 606, are components of non-interest income. These revenue streams can generally be classified into wealth management revenue, insurance agency income and banking service charges and other fees. The following table presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the three months ended March 31, 2021 and 2020: Three months ended March 31, (in-thousands) 2021 2020 Non-interest income In-scope of Topic 606: Wealth management fees $ 7,134 6,251 Insurance agency income 2,727 — Banking service charges and other fees: Service charges on deposit accounts 2,497 2,977 Debit card and ATM fees 1,778 1,210 Total banking service charges and other fees 4,275 4,187 Total in-scope non-interest income 14,136 10,438 Total out-of-scope non-interest income 7,501 6,553 Total non-interest income $ 21,637 16,991 Wealth management fee income represents fees earned from customers as consideration for asset management, investment advisory and trust services. The Company’s performance obligation is generally satisfied monthly and the resulting fees are recognized monthly. The fee is generally based upon the average market value of the assets under management ("AUM") for the month and the applicable fee rate. The monthly accrual of wealth management fees is recorded in other assets on the Company's Consolidated Statements of Financial Condition. Fees are received from the customer on a monthly basis. The Company does not earn performance-based incentives. To a lesser extent, optional services such as tax return preparation and estate settlement are also available to existing customers. The Company’s performance obligation for these transaction-based services are generally satisfied, and related revenue recognized, at either a point in time when the service is completed, or in the case of estate settlement, over a relatively short period of time, as each service component is completed. Insurance agency income, consisting of commissions and fees, is generally recognized as of the effective date of the insurance policy. Commission revenues related to installment billings are recognized on the invoice date. Subsequent commission adjustments are recognized upon the receipt of notification from insurance companies concerning matters necessitating such adjustments. Profit-sharing contingent commissions are recognized when determinable, which is generally when such commissions are received from insurance companies, or when the Company receives formal notification of the amount of such payments. Service charges on deposit accounts include overdraft service fees, account analysis fees and other deposit related fees. These fees are generally transaction-based, or time-based services. The Company's performance obligation for these services are generally satisfied, and revenue recognized, at the time the transaction is completed, or the service rendered. Fees for these services are generally received from the customer either at the time of transaction, or monthly. Debit card and ATM fees are generally transaction-based. Debit card revenue is primarily comprised of interchange fees earned when a customer's Company card is processed through a card payment network. ATM fees are largely generated when a Company cardholder uses a non-Company ATM, or a non-Company cardholder uses a Company ATM. The Company's performance obligation for these services is satisfied when the service is rendered. Payment is generally received at time of transaction or monthly. Out-of-scope non-interest income primarily consists of Bank-owned life insurance and net fees on loan level interest rate swaps, along with gains and losses on the sale of loans and foreclosed real estate, loan prepayment fees and loan servicing fees. None of these revenue streams are subject to the requirements of Topic 606.

Leases

Leases	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Leases	Leases The following table represents the consolidated statements of financial condition classification of the Company’s right-of use-assets and lease liabilities at March 31, 2021 and December 31, 2020 (in thousands): Classification March 31, 2021 December 31, 2020 Lease Right-of-Use Assets: Operating lease right-of-use assets Other assets $ 40,960 $ 41,142 Lease Liabilities: Operating lease liabilities Other liabilities $ 42,323 $ 42,042 The calculated amount of the right-of-use assets and lease liabilities in the table above are impacted by the length of the lease term and the discount rate used to present value the minimum lease payments. The Company’s lease agreements often include one or more options to renew at the Company’s discretion. If at lease inception the Company considers the exercising of a renewal option to be reasonably certain, the Company will include the extended term in the calculation of the right-of-use asset and lease liability. Generally, the Company considers the first renewal option to be reasonably certain and includes it in the calculation of the right-of use asset and lease liability. Regarding the discount rate, Topic 842 requires the use of the rate implicit in the lease whenever this rate is readily determinable. As this rate is rarely determinable, the Company utilizes its incremental borrowing rate at lease inception based upon the term of the lease. For operating leases existing prior to January 1, 2019, the rate for the remaining lease term as of January 1, 2019 was applied. All of the leases in which the Company is the lessee are classified as operating leases and are primarily comprised of real estate properties for branches and administrative offices with terms extending through 2040. At March 31, 2021, the weighted-average remaining lease term and the weighted-average discount rate for the Company's operating leases were 8.8 years and 3.14%, respectively. The following tables represent lease costs and other lease information for the Company's operating leases. The variable lease cost primarily represents variable payments such as common area maintenance and utilities (in thousands): Three months ended March 31, 2021 Three months ended March 31, 2020 Lease Costs Operating lease cost $ 2,812 $ 2,130 Variable lease cost 803 607 Total lease cost $ 3,615 $ 2,737 Cash paid for amounts included in the measurement of lease liabilities: Three months ended March 31, 2021 Three months ended March 31, 2020 Operating cash flows from operating leases $ 2,345 2,125 Future minimum payments for operating leases with initial or remaining terms of one year or more as of March 31, 2021 were as follows (in thousands): Operating leases Twelve months ended: Remainder of 2021 $ 6,472 2022 6,391 2023 5,878 2024 5,475 2025 4,887 Thereafter 20,027 Total future minimum lease payments 49,130 Amounts representing interest 6,807 Present value of net future minimum lease payments $ 42,323

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Basis of Financial Statement Presentation	Basis of Financial Statement Presentation The accompanying unaudited consolidated financial statements include the accounts of Provident Financial Services, Inc. and its wholly owned subsidiary, Provident Bank (the “Bank,” together with Provident Financial Services, Inc., the “Company”). In preparing the interim unaudited consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated statements of financial condition and the consolidated statements of income for the periods presented. Actual results could differ from these estimates. The allowance for credit losses and the valuation of deferred tax assets are material estimates that are particularly susceptible to near-term change. The interim unaudited consolidated financial statements reflect all normal and recurring adjustments, which are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results of operations that may be expected for all of 2021.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Calculations	The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share calculations for the three months ended March 31, 2021 and 2020 (dollars in thousands, except per share amounts): Three months ended March 31, 2021 2020 Net Weighted Per Net Weighted Per Net income $ 48,559 $ 14,931 Basic earnings per share: Income available to common stockholders $ 48,559 76,516,543 $ 0.63 $ 14,931 64,386,138 $ 0.23 Dilutive shares 64,319 71,125 Diluted earnings per share: Income available to common stockholders $ 48,559 76,580,862 $ 0.63 $ 14,931 64,457,263 $ 0.23

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Schedule of Estimated Fair Vales of Assets and Liabilities Assumed	The following table summarizes the estimated fair values of the assets acquired and the liabilities assumed at the date of acquisition from SB One (in thousands): At July 31, 2020 Assets acquired: Cash and cash equivalents, net $ 78,089 Available for sale debt securities 231,645 Held to maturity debt securities 12,381 Federal Home Loan Bank stock 11,216 Loans 1,766,115 Allowance for credit losses on PCD loans (13,586) Loans, net 1,752,529 Bank-owned life insurance 37,237 Banking premises and equipment 16,620 Accrued interest receivable 8,947 Goodwill 22,439 Other intangibles assets 9,965 Foreclosed assets, net 2,441 Other assets 12,199 Total assets acquired $ 2,195,708 Liabilities assumed: Deposits $ 1,757,777 Borrowed funds 201,582 Subordinated debentures 25,074 Other liabilities 30,447 Total liabilities assumed $ 2,014,880 Net assets acquired $ 180,828
Schedule of Fair Value of Loans Acquired in Acquisition	The table below illustrates the fair value adjustments made to the amortized cost basis in order to present a fair value of the loans acquired (in thousands): Gross amortized cost basis at July 31, 2020 $ 1,787,057 Interest rate fair value adjustment on all loans 455 Credit fair value adjustment on non-PCD loans (21,397) Fair value of acquired loans at July 31, 2020 1,766,115 Allowance for credit losses on PCD loans (13,586) Fair value of acquired loans, net at July 31, 2020 $ 1,752,529 The table below is a summary of the PCD loans accounted for in accordance with ASC 310-26 that were acquired in the SB One acquisition as of the closing date (in thousands): Gross amortized cost basis at July 31, 2020 $ 315,784 Interest component of expected cash flows (accretable difference) (7,988) Allowance for credit losses on PCD loans (13,586) Net PCD loans $ 294,210 The table below is a summary of the PCD loans accounted for in accordance with ASC 310-26 that were acquired in the SB One acquisition at the July 31, 2020 closing date (in thousands): Gross amortized cost basis at July 31, 2020 $ 315,784 Interest component of expected cash flows (accretable difference) (7,988) Fair value of PCD loans 307,796 Allowance for credit losses on PCD loans (13,586) Net PCD loans $ 294,210

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities Available for Sale	The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for available for sale debt securities at March 31, 2021 and December 31, 2020 (in thousands): March 31, 2021 Amortized Gross Gross Fair Mortgage-backed securities $ 1,042,480 23,915 (6,243) 1,060,152 Asset-backed securities 47,329 1,876 — 49,205 State and municipal obligations 69,443 429 (938) 68,934 Corporate obligations 38,149 739 (243) 38,645 $ 1,197,401 26,959 (7,424) 1,216,936 December 31, 2020 Amortized Gross Gross Fair Agency obligations $ 1,001 8 — 1,009 Mortgage-backed securities 910,393 28,872 (852) 938,413 Asset-backed securities 52,295 1,535 — 53,830 State and municipal obligations 69,687 1,666 (95) 71,258 Corporate obligations 40,194 809 (24) 40,979 $ 1,073,570 32,890 (971) 1,105,489
Available for sale Debt Securities with Temporary Impairment	The following tables present the fair values and gross unrealized losses for available for sale debt securities in an unrealized loss position at March 31, 2021 and December 31, 2020 (in thousands): March 31, 2021 Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Mortgage-backed securities $ 345,988 (6,209) 8,110 (34) 354,098 (6,243) State and municipal obligations 40,517 (938) — — 40,517 (938) Corporate obligations 6,655 (243) — — 6,655 (243) $ 393,160 (7,390) 8,110 (34) 401,270 (7,424) December 31, 2020 Less than 12 months 12 months or longer Total Fair value Gross Fair value Gross Fair Gross Mortgage-backed securities $ 127,600 (824) 8,007 (28) 135,607 (852) State and municipal obligations 5,275 (95) — — 5,275 (95) Corporate obligations — — 2,000 (24) 2,000 (24) $ 132,875 (919) 10,007 (52) 142,882 (971)
Investment Securities Held to Maturity	The following tables present the amortized cost, gross unrealized gains, gross unrealized losses, allowance for credit losses and the estimated fair value for held to maturity debt securities at March 31, 2021 and December 31, 2020 (in thousands): March 31, 2021 Amortized Gross Gross Fair Agency obligations $ 8,998 1 (95) 8,904 Mortgage-backed securities 50 1 — 51 State and municipal obligations 428,631 16,970 (825) 444,776 Corporate obligations 10,300 65 (103) 10,262 $ 447,979 17,037 (1,023) 463,993 At March 31, 2021, the allowance for credit losses on held to maturity debt securities totaled $77,000. December 31, 2020 Amortized Gross Gross Fair Agency obligations $ 7,600 6 (5) 7,601 Mortgage-backed securities 62 2 — 64 State and municipal obligations 433,655 21,442 (58) 455,039 Corporate obligations 9,726 101 (2) 9,825 $ 451,043 21,551 (65) 472,529
Schedule of Impact of ASC 326	The following table illustrates the impact of the January 1, 2020 adoption of CECL on held to maturity debt securities (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Held to Maturity Debt Securities Allowance for credit losses on corporate securities $ 6 — 6 Allowance for credit losses on municipal securities 64 — 64 Allowance for credit losses on held to maturity debt securities $ 70 — 70 The following table illustrates the impact the January 1, 2020 adoption of CECL had on the allowance for credits losses for the loan portfolio (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Loans Residential $ 8,950 3,414 5,536 Commercial 17,118 12,831 4,287 Multi-family 9,519 3,374 6,145 Construction 4,152 5,892 (1,740) Total mortgage loans 39,739 25,511 14,228 Commercial loans 18,254 28,263 (10,009) Consumer loans 5,452 1,751 3,701 Allowance for credit losses on loans $ 63,445 55,525 7,920 The following table illustrates the impact of the January 1, 2020 adoption of CECL on off-balance sheet credit exposures: January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Liabilities Allowance for credit losses on off-balance sheet credit exposure $ 3,206 — 3,206
Schedule of Unrealized Loss on Investments	The following tables present the fair values and gross unrealized losses for held to maturity debt securities in an unrealized loss position at March 31, 2021 and December 31, 2020 (in thousands): March 31, 2021 Unrealized Losses Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 6,903 (95) — — 6,903 (95) State and municipal obligations 19,697 (809) 406 (16) 20,103 (825) Corporate obligations 6,146 (103) — — 6,146 (103) $ 32,746 (1,007) 406 (16) 33,152 (1,023) December 31, 2020 Unrealized Losses Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 1,995 (5) — — 1,995 (5) State and municipal obligations 4,846 (41) 406 (17) 5,252 (58) Corporate obligations 786 (2) — — 786 (2) $ 7,627 (48) 406 (17) 8,033 (65)
Amortized Cost of held To Maturity Debt Securities by Year of Originations and Credit Rating	Credit Quality Indicators. The following table provides the amortized cost of held to maturity debt securities by credit rating as of March 31, 2021 (in thousands): March 31, 2021 Total Portfolio AAA AA A BBB Not Rated Total Agency obligations $ 8,998 — — — — 8,998 Mortgage-backed securities 50 — — — — 50 State and municipal obligations 57,207 308,572 51,678 1,115 10,059 428,631 Corporate obligations — 3,087 7,188 — 25 10,300 $ 66,255 311,659 58,866 1,115 10,084 447,979 December 31, 2020 Total Portfolio AAA AA A BBB Not Rated Total Agency obligations $ 7,600 — — — — 7,600 Mortgage-backed securities 62 — — — — 62 State and municipal obligations 57,830 311,155 53,302 1,115 10,253 433,655 Corporate obligations — 3,255 6,446 — 25 9,726 $ 65,492 314,410 59,748 1,115 10,278 451,043
Available-for-sale Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Investment Securities Classified by Contractual Maturity	The amortized cost and fair value of available for sale debt securities at March 31, 2021, by contractual maturity, are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer. March 31, 2021 Amortized Fair Due in one year or less $ — — Due after one year through five years 3,651 3,761 Due after five years through ten years 38,002 38,532 Due after ten years 65,939 65,286 $ 107,592 107,579
Held-to-maturity Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Investment Securities Classified by Contractual Maturity	The amortized cost and fair value of investment securities in the held to maturity debt securities portfolio at March 31, 2021 by contractual maturity are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer. March 31, 2021 Amortized Fair Due in one year or less $ — — Due after one year through five years 163,682 167,460 Due after five years through ten years 213,875 224,327 Due after ten years 70,372 72,155 $ 447,929 463,942

Loans Receivable and Allowanc_2

Loans Receivable and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Schedule of Summarized Loans Receivable	Loans receivable at March 31, 2021 and December 31, 2020 are summarized as follows (in thousands): March 31, 2021 December 31, 2020 Mortgage loans: Residential $ 1,277,376 1,294,702 Commercial 3,594,012 3,458,666 Multi-family 1,458,193 1,484,515 Construction 615,706 541,939 Total mortgage loans 6,945,287 6,779,822 Commercial loans 2,510,708 2,567,470 Consumer loans 363,648 492,566 Total gross loans 9,819,643 9,839,858 Premiums on purchased loans 1,378 1,566 Unearned discounts (7) (12) Net deferred fees (17,478) (18,522) Total loans $ 9,803,536 9,822,890
Summary of Aging Loans Receivable by Portfolio Segment and Class	The following tables summarize the aging of loans receivable by portfolio segment and class of loans (in thousands): March 31, 2021 30-59 Days 60-89 Days Non-accrual Recorded Total Past Current Total Loans Non-accrual loans with no related allowance Mortgage loans: Residential $ 6,862 6,161 7,797 — 20,820 1,256,556 1,277,376 7,797 Commercial 2,183 520 33,742 — 36,445 3,557,567 3,594,012 33,742 Multi-family 1,327 — 101 — 1,428 1,456,765 1,458,193 101 Construction 1,123 1,656 1,392 — 4,171 611,535 615,706 1,392 Total mortgage loans 11,495 8,337 43,032 — 62,864 6,882,423 6,945,287 43,032 Commercial loans 393 235 36,042 — 36,670 2,474,038 2,510,708 21,298 Consumer loans 1,356 277 3,010 — 4,643 359,005 363,648 3,009 Total gross loans $ 13,244 8,849 82,084 — 104,177 9,715,466 9,819,643 67,339 December 31, 2020 30-59 Days 60-89 Days Non-accrual Recorded Total Past Current Total Loans Receivable Non-accrual loans with no related allowance Mortgage loans: Residential $ 15,789 8,852 9,315 — 33,956 1,260,746 1,294,702 9,315 Commercial 761 113 31,982 — 32,856 3,425,810 3,458,666 20,482 Multi-family 206 585 — — 791 1,483,724 1,484,515 — Construction — — 1,392 — 1,392 540,547 541,939 1,392 Total mortgage loans 16,756 9,550 42,689 — 68,995 6,710,827 6,779,822 31,189 Commercial loans 1,658 1,179 42,118 — 44,955 2,522,515 2,567,470 15,541 Consumer loans 4,348 4,519 2,283 — 11,150 481,416 492,566 2,283 Total gross loans $ 22,762 15,248 87,090 — 125,100 9,714,758 9,839,858 49,013
Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification	The activity in the allowance for credit losses by portfolio segment for the three months ended March 31, 2021 and 2020 was as follows (in thousands): March 31, 2021 Mortgage loans Commercial loans Consumer loans Total Balance at beginning of period $ 68,307 27,084 6,075 101,466 Provision benefit to operations (13,467) (467) (1,066) (15,000) Recoveries of loans previously charged-off 276 528 303 1,107 Loans charged-off (918) (843) (221) (1,982) Balance at end of period $ 54,198 26,302 5,091 85,591 March 31, 2020 Mortgage loans Commercial loans Consumer loans Total Balance at beginning of period $ 25,511 28,263 1,751 55,525 Provision charge (benefit) to operations 7,710 7,619 (629) 14,700 Retained earnings (due to initial CECL adoption) 14,188 (9,974) 3,706 7,920 Recoveries of loans previously charged-off 93 313 123 529 Loans charged-off (2) (3,380) (149) (3,531) Balance at end of period $ 47,500 22,841 4,802 75,143 The allowance for credit losses is summarized by portfolio segment and impairment classification as follows (in thousands): March 31, 2021 Mortgage Commercial loans Consumer loans Total Individually evaluated for impairment $ 927 3,832 43 4,802 Collectively evaluated for impairment 53,271 22,470 5,048 80,789 Total gross loans $ 54,198 26,302 5,091 85,591 December 31, 2020 Mortgage Commercial loans Consumer Total Individually evaluated for impairment $ 4,220 4,715 39 8,974 Collectively evaluated for impairment 64,087 22,369 6,036 92,492 Total gross loans $ 68,307 27,084 6,075 101,466
Schedule of Impact of ASC 326	The following table illustrates the impact of the January 1, 2020 adoption of CECL on held to maturity debt securities (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Held to Maturity Debt Securities Allowance for credit losses on corporate securities $ 6 — 6 Allowance for credit losses on municipal securities 64 — 64 Allowance for credit losses on held to maturity debt securities $ 70 — 70 The following table illustrates the impact the January 1, 2020 adoption of CECL had on the allowance for credits losses for the loan portfolio (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Loans Residential $ 8,950 3,414 5,536 Commercial 17,118 12,831 4,287 Multi-family 9,519 3,374 6,145 Construction 4,152 5,892 (1,740) Total mortgage loans 39,739 25,511 14,228 Commercial loans 18,254 28,263 (10,009) Consumer loans 5,452 1,751 3,701 Allowance for credit losses on loans $ 63,445 55,525 7,920 The following table illustrates the impact of the January 1, 2020 adoption of CECL on off-balance sheet credit exposures: January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Liabilities Allowance for credit losses on off-balance sheet credit exposure $ 3,206 — 3,206
Summary of Loans Receivable by Portfolio Segment and Impairment Method	The following tables summarize loans receivable by portfolio segment and impairment method (in thousands): March 31, 2021 Mortgage Commercial Consumer Total Portfolio Individually evaluated for impairment $ 49,783 28,359 1,405 79,547 Collectively evaluated for impairment 6,895,504 2,482,349 362,243 9,740,096 Total gross loans $ 6,945,287 2,510,708 363,648 9,819,643 December 31, 2020 Mortgage Commercial Consumer Total Portfolio Individually evaluated for impairment $ 48,783 35,832 1,431 86,046 Collectively evaluated for impairment 6,731,039 2,531,638 491,135 9,753,812 Total gross loans $ 6,779,822 2,567,470 492,566 9,839,858
Schedule of Troubled Debt Restructuring	The following tables present the number of loans modified as TDRs during the three months ended March 31, 2021 and 2020, along with their balances immediately prior to the modification date and post-modification as of March 31, 2021 and 2020 (in thousands): For the three months ended March 31, 2021 March 31, 2020 Troubled Debt Restructurings Number of Pre-Modification Post-Modification Number of Pre-Modification Post-Modification ($ in thousands) Commercial loans 3 $ 1,361 $ 1,359 2 $ 746 $ 731 Total restructured loans 3 $ 1,361 $ 1,359 2 $ 746 $ 731
Schedule of Fair Value of Loans Acquired in Acquisition	The table below illustrates the fair value adjustments made to the amortized cost basis in order to present a fair value of the loans acquired (in thousands): Gross amortized cost basis at July 31, 2020 $ 1,787,057 Interest rate fair value adjustment on all loans 455 Credit fair value adjustment on non-PCD loans (21,397) Fair value of acquired loans at July 31, 2020 1,766,115 Allowance for credit losses on PCD loans (13,586) Fair value of acquired loans, net at July 31, 2020 $ 1,752,529 The table below is a summary of the PCD loans accounted for in accordance with ASC 310-26 that were acquired in the SB One acquisition as of the closing date (in thousands): Gross amortized cost basis at July 31, 2020 $ 315,784 Interest component of expected cash flows (accretable difference) (7,988) Allowance for credit losses on PCD loans (13,586) Net PCD loans $ 294,210 The table below is a summary of the PCD loans accounted for in accordance with ASC 310-26 that were acquired in the SB One acquisition at the July 31, 2020 closing date (in thousands): Gross amortized cost basis at July 31, 2020 $ 315,784 Interest component of expected cash flows (accretable difference) (7,988) Fair value of PCD loans 307,796 Allowance for credit losses on PCD loans (13,586) Net PCD loans $ 294,210
Summary of Impaired Loans Receivable by Class	The following table presents loans individually evaluated for impairment by class and loan category (in thousands): March 31, 2021 December 31, 2020 Unpaid Principal Balance Recorded Investment Related Allowance Average Recorded Investment Interest Income Recognized Unpaid Principal Balance Recorded Investment Related Allowance Average Recorded Investment Interest Income Recognized Loans with no related allowance Mortgage loans: Residential $ 12,267 9,794 — 10,083 118 13,981 11,380 — 11,587 511 Commercial 34,125 30,656 — 31,555 17 17,414 17,414 — 16,026 60 Total 46,392 40,450 — 41,638 135 31,395 28,794 — 27,613 571 Commercial loans 11,630 8,963 — 9,082 — 15,895 14,009 — 12,791 46 Consumer loans 1,360 857 — 2,319 13 1,382 880 — 7 50 Total impaired loans $ 59,382 50,270 — 53,039 148 48,672 43,683 — 40,411 667 Loans with an allowance recorded Mortgage loans: Residential $ 8,938 8,438 904 8,461 77 7,950 7,506 806 7,604 307 Commercial 895 895 23 925 13 14,993 12,483 3,414 123 570 Total 9,833 9,333 927 9,386 90 22,943 19,989 4,220 7,727 877 Commercial loans 22,622 19,396 3,832 23,451 123 24,947 21,823 4,715 18,620 311 Consumer loans 563 548 43 550 10 565 551 39 5 20 Total impaired loans $ 33,018 29,277 4,802 33,387 223 48,455 42,363 8,974 26,352 1,208 Total impaired loans Mortgage loans: Residential $ 21,205 18,232 904 18,544 195 21,931 18,886 806 19,191 818 Commercial 35,020 31,551 23 32,480 30 32,407 29,897 3,414 16,149 630 Total 56,225 49,783 927 51,024 225 54,338 48,783 4,220 35,340 1,448 Commercial loans 34,252 28,359 3,832 32,533 123 40,842 35,832 4,715 31,411 357 Consumer loans 1,923 1,405 43 2,869 23 1,947 1,431 39 12 70 Total impaired loans $ 92,400 79,547 4,802 86,426 371 97,127 86,046 8,974 66,763 1,875
Summary of Loans Receivable by Credit Quality Risk Rating Indicator	The following table summarizes the Company's gross loans held for investment by year of origination and internally assigned credit grades (in thousands): At March 31, 2021 Total portfolio Residential Commercial mortgage Multi-family Construction Total Commercial Consumer Total Loans (1) Special mention $ 5,847 129,051 35,885 25,409 196,192 115,619 529 312,340 Substandard 23,416 109,689 1,552 5,736 140,393 124,581 3,836 268,810 Doubtful — — — — — 20 — 20 Loss — — — — — — — — Total criticized and classified 29,263 238,740 37,437 31,145 336,585 240,220 4,365 581,170 Pass/Watch 1,248,113 3,355,272 1,420,756 584,561 6,608,702 2,270,488 359,283 9,238,473 Total $ 1,277,376 3,594,012 1,458,193 615,706 6,945,287 2,510,708 363,648 9,819,643 2021 Special mention $ — — — — — 23 — 23 Substandard — — — — — 391 — 391 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified — — — — — 414 — 414 Pass/Watch 82,831 78,552 31,141 14,913 207,437 252,045 8,947 468,429 Total gross loans $ 82,831 78,552 31,141 14,913 207,437 252,459 8,947 468,843 2020 Special mention $ — $ — $ — $ 1,986 $ 1,986 $ 345 $ — $ 2,331 Substandard 163 — — — 163 1,824 — 1,987 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 163 — — 1,986 2,149 2,169 — 4,318 Pass/Watch 262,032 670,040 296,124 123,927 1,352,123 595,559 39,107 1,986,789 Total gross loans $ 262,195 670,040 296,124 125,913 1,354,272 597,728 39,107 1,991,107 2019 Special mention $ 661 30,310 679 16,189 47,839 8,819 — 56,658 Substandard 3,773 2,426 — — 6,199 9,856 361 16,416 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 4,434 32,736 679 16,189 54,038 18,675 361 73,074 Pass/Watch 139,951 632,084 177,648 259,223 1,208,906 246,072 46,155 1,501,133 Total gross loans $ 144,385 664,820 178,327 275,412 1,262,944 264,747 46,516 1,574,207 2018 Special mention $ 2,425 39,825 20,125 — 62,375 3,578 — 65,953 Substandard 744 5,383 — 5,121 11,248 6,568 120 17,936 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 3,169 45,208 20,125 5,121 73,623 10,146 120 83,889 Pass/Watch 81,320 385,080 183,343 145,307 795,050 228,963 44,128 1,068,141 Total gross loans $ 84,489 430,288 203,468 150,428 868,673 239,109 44,248 1,152,030 2017 and prior Special mention $ 2,761 58,916 15,081 7,234 83,992 102,854 529 187,375 Substandard 18,736 101,880 1,552 615 122,783 105,942 3,355 232,080 Doubtful — — — — — 20 — 20 Loss — — — — — — — — Total criticized and classified 21,497 160,796 16,633 7,849 206,775 208,816 3,884 419,475 Pass/Watch 681,979 1,589,516 732,500 41,191 3,045,186 947,849 220,946 4,213,981 Total gross loans $ 703,476 1,750,312 749,133 49,040 3,251,961 1,156,665 224,830 4,633,456 At December 31, 2020 Residential Commercial mortgage Multi-family Construction Total Commercial Consumer Total loans Special mention $ 2,882 124,631 29,781 24,376 181,670 157,080 1,867 340,617 Substandard 26,651 98,313 1,568 4,924 131,456 127,092 6,746 265,294 Doubtful — — — — — 52 — 52 Loss — — — — — — — — Total criticized and classified 29,533 222,944 31,349 29,300 313,126 284,224 8,613 605,963 Pass/Watch 1,265,169 3,235,722 1,453,166 512,639 6,466,696 2,283,246 483,953 9,233,895 Total $ 1,294,702 3,458,666 1,484,515 541,939 6,779,822 2,567,470 492,566 9,839,858

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2021
Banking and Thrift, Other Disclosures [Abstract]
Schedule of Deposits	Deposits at March 31, 2021 and December 31, 2020 are summarized as follows (in thousands): March 31, 2021 December 31, 2020 Savings $ 1,402,363 1,348,147 Money market 2,345,640 2,245,412 NOW 3,075,098 2,808,637 Non-interest bearing 2,511,408 2,341,459 Certificates of deposit 963,004 1,094,174 Total deposits $ 10,297,513 9,837,829

Components of Net Periodic Be_2

Components of Net Periodic Benefit Cost (Tables)	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Net Periodic Benefit Cost (Increase)	Net periodic (benefit) increase cost for pension benefits and other post-retirement benefits for the three months ended March 31, 2021 and 2020 includes the following components (in thousands): Three months ended March 31, Pension benefits Other post-retirement benefits 2021 2020 2021 2020 Service cost $ — — 9 20 Interest cost 198 250 106 178 Expected return on plan assets (807) (737) — — Amortization of prior service cost — — — — Amortization of the net loss (gain) 118 174 (268) (62) Net periodic (benefit) increase cost $ (491) (313) (153) 136

Allowance for Credit Losses o_2

Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Tables)	3 Months Ended
	Mar. 31, 2021
Credit Loss [Abstract]
Schedule of Impact of ASC 326	The following table illustrates the impact of the January 1, 2020 adoption of CECL on held to maturity debt securities (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Held to Maturity Debt Securities Allowance for credit losses on corporate securities $ 6 — 6 Allowance for credit losses on municipal securities 64 — 64 Allowance for credit losses on held to maturity debt securities $ 70 — 70 The following table illustrates the impact the January 1, 2020 adoption of CECL had on the allowance for credits losses for the loan portfolio (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Loans Residential $ 8,950 3,414 5,536 Commercial 17,118 12,831 4,287 Multi-family 9,519 3,374 6,145 Construction 4,152 5,892 (1,740) Total mortgage loans 39,739 25,511 14,228 Commercial loans 18,254 28,263 (10,009) Consumer loans 5,452 1,751 3,701 Allowance for credit losses on loans $ 63,445 55,525 7,920 The following table illustrates the impact of the January 1, 2020 adoption of CECL on off-balance sheet credit exposures: January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Liabilities Allowance for credit losses on off-balance sheet credit exposure $ 3,206 — 3,206

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Assets and Liabilities Reported on Consolidated Statements of Financial Condition at Fair Values	The following tables present the assets and liabilities reported on the consolidated statements of financial condition at their fair values as of March 31, 2021 and December 31, 2020, by level within the fair value hierarchy (in thousands): Fair Value Measurements at Reporting Date Using: March 31, 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured on a recurring basis: Available for sale debt securities: Mortgage-backed securities $ 1,060,152 — 1,060,152 — Asset-backed securities 49,205 — 49,205 — State and municipal obligations 68,934 — 68,934 — Corporate obligations 38,645 — 38,645 — Total available for sale debt securities 1,216,936 — 1,216,936 — Equity securities 1,026 1,026 — — Derivative assets 76,542 — 76,542 — $ 1,294,504 1,026 1,293,478 — Derivative liabilities $ 78,228 — 78,228 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 30,120 — — 30,120 Foreclosed assets 3,554 — — 3,554 $ 33,674 — — 33,674 Fair Value Measurements at Reporting Date Using: December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured on a recurring basis: Available for sale debt securities: Agency obligations $ 1,009 1,009 — — Mortgage-backed securities 938,413 — 938,413 — Asset-backed securities 53,830 53,830 State and municipal obligations 71,258 — 71,258 — Corporate obligations 40,979 — 40,979 — Total available for sale debt securities 1,105,489 1,009 1,104,480 — Equity Securities 971 971 — — Derivative assets 101,079 — 101,079 — $ 1,207,539 1,980 1,205,559 — Derivative liabilities $ 109,148 — 109,148 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 26,250 — — 26,250 Foreclosed assets 4,475 — — 4,475 $ 30,725 — — 30,725
Schedule of Financial Instruments at Carrying and Fair Values	The following tables present the Company’s financial instruments at their carrying and fair values as of March 31, 2021 and December 31, 2020. Fair values are presented by level within the fair value hierarchy. Fair Value Measurements at March 31, 2021 Using: (Dollars in thousands) Carrying value Fair value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 687,570 687,570 687,570 — — Available for sale debt securities: Mortgage-backed securities 1,060,152 1,060,152 — 1,060,152 — Asset-backed securities 49,205 49,205 49,205 State and municipal obligations 68,934 68,934 — 68,934 — Corporate obligations 38,645 38,645 — 38,645 — Total available for sale debt securities $ 1,216,936 1,216,936 — 1,216,936 — Held to maturity debt securities, net of allowance for credit losses: Agency obligations 8,998 8,904 8,904 — — Mortgage-backed securities 50 51 — 51 — State and municipal obligations 428,571 444,776 — 444,776 — Corporate obligations 10,283 10,262 — 10,262 — Total held to maturity debt securities, net of allowance for credit losses $ 447,902 463,993 8,904 455,089 — FHLBNY stock 48,998 48,998 48,998 — — Equity Securities 1,026 1,026 1,026 — — Loans, net of allowance for credit losses 9,717,945 9,857,891 — — 9,857,891 Derivative assets 76,542 76,542 — 76,542 — Financial liabilities: Deposits other than certificates of deposits $ 9,334,509 9,334,509 9,334,509 — — Certificates of deposit 963,004 967,088 — 967,088 — Total deposits $ 10,297,513 10,301,597 9,334,509 967,088 — Borrowings 940,611 945,538 — 945,538 — Subordinated debentures 25,173 30,325 — 30,325 — Derivative liabilities 78,228 78,228 — 78,228 — Fair Value Measurements at December 31, 2020 Using: (Dollars in thousands) Carrying value Fair value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 532,353 532,353 532,353 — — Available for sale debt securities: U.S. Treasury obligations — — — — Agency obligations 1,009 1,009 1,009 — — Mortgage-backed securities 938,413 938,413 — 938,413 — Asset-backed securities 53,830 53,830 53,830 State and municipal obligations 71,258 71,258 — 71,258 — Corporate obligations 40,979 40,979 — 40,979 — Total available for sale debt securities $ 1,105,489 1,105,489 1,009 1,104,480 — Held to maturity debt securities: Agency obligations $ 7,600 7,601 7,601 — — Mortgage-backed securities 62 64 — 64 — State and municipal obligations 433,589 454,973 — 454,973 — Corporate obligations 9,714 9,813 — 9,813 — Total held to maturity debt securities, net of allowance for credit losses $ 450,965 472,451 7,601 464,850 — FHLBNY stock 59,489 59,489 59,489 — — Equity securities 971 971 971 — — Loans, net of allowance for credit losses 9,721,424 9,969,330 — — 9,969,330 Derivative assets 101,079 101,079 — 101,079 — Financial liabilities: Deposits other than certificates of deposits $ 8,743,655 8,743,655 8,743,655 — — Certificates of deposit 1,094,174 1,097,993 — 1,097,993 — Total deposits $ 9,837,829 9,841,648 8,743,655 1,097,993 — Borrowings 1,175,972 1,193,024 — 1,193,024 — Subordinated debentures 25,135 24,375 — 24,375 — Derivative liabilities 109,148 109,148 — 109,148 —

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Components of Other Comprehensive Income (Loss)	The following table presents the components of other comprehensive (loss) income, both gross and net of tax, for the three months ended March 31, 2021 and 2020 (in thousands): Three months ended March 31, 2021 2020 Before Tax After Before Tax After Components of Other Comprehensive (Loss) Income: Unrealized gains and losses on available for sale debt securities: Net unrealized (losses) gains arising during the period $ (12,152) 3,133 (9,019) 22,563 (5,817) 16,746 Reclassification adjustment for gains included in net income (230) 59 (171) — — — Total (12,382) 3,192 (9,190) 22,563 (5,817) 16,746 Unrealized gains (losses) on derivatives (cash flow hedges) 6,226 (1,605) 4,621 (7,697) 1,984 (5,713) Amortization related to post-retirement obligations (150) 41 (109) 112 (28) 84 Total other comprehensive (loss) income $ (6,306) 1,628 (4,678) 14,978 (3,861) 11,117
Components of Accumulated Other Comprehensive Income, Net of Tax	The following tables present the changes in the components of accumulated other comprehensive income, net of tax, for the three months ended March 31, 2021 and 2020 (in thousands): Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax 2021 2020 Unrealized Post- Retirement Unrealized (Losses) Gains on Derivatives (cash flow hedges) Accumulated Unrealized Gains on Post- Retirement Unrealized Gains (Losses) on Derivatives (cash flow hedges) Accumulated Balance at $ 23,690 (1,081) (4,954) 17,655 8,746 (5,240) 315 3,821 Current - period other comprehensive (loss) income (9,190) (109) 4,621 (4,678) 16,746 84 (5,713) 11,117 Balance at March 31, $ 14,500 (1,190) (333) 12,977 25,492 (5,156) (5,398) 14,938
Summary of Reclassifications Out of Accumulated Other Comprehensive Income	The following tables summarize the reclassifications from accumulated other comprehensive income (loss) to the consolidated statements of income for the three months ended March 31, 2021 and 2020 (in thousands): Reclassifications From Accumulated Other Comprehensive Amount reclassified from AOCI for the three months ended March 31, Affected line item in the Consolidated 2021 2020 Details of AOCI: Available for sale debt securities: Realized net gains on the sale of securities available for sale $ 230 — Net gain on securities transactions (59) — Income tax expense 171 — Net of tax Post-retirement obligations: Amortization of actuarial (losses) gains $ (150) 112 Compensation and employee benefits (1) 41 (28) Income tax expense Total reclassification $ (109) 84 Net of tax (1) This item is included in the computation of net periodic benefit cost. See Note 6. Components of Net Periodic Benefit Cost.

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Financial Instruments	The tables below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Statements of Financial Condition at March 31, 2021 and December 31, 2020 (in thousands): At March 31, 2021 Asset Derivatives Liability Derivatives Consolidated Statements of Financial Condition Fair Consolidated Statements of Financial Condition Fair Derivatives not designated as a hedging instrument: Interest rate products Other assets $ 74,668 Other liabilities $ 75,740 Credit contracts Other assets 96 Other liabilities — Total derivatives not designated as a hedging instrument $ 74,764 $ 75,740 Derivatives designated as a hedging instrument: Interest rate products Other assets $ 1,778 Other liabilities $ 2,488 Total derivatives designated as a hedging instrument $ 1,778 $ 2,488 At December 31, 2020 Asset Derivatives Liability Derivatives Consolidated Statements of Financial Condition Fair Consolidated Statements of Financial Condition Fair Derivatives not designated as a hedging instrument: Interest rate products Other assets $ 107,652 Other liabilities $ 109,148 Credit contracts Other assets 97 Other liabilities — Total derivatives not designated as a hedging instrument $ 107,749 $ 109,148 Derivatives designated as a hedging instrument: Interest rate products Other assets $ (6,671) Other liabilities $ — Total derivatives designated as a hedging instrument $ (6,671) $ —
Effect of the derivative financial instruments on the Income Statement	The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Income during the three months ended March 31, 2021 and 2020 (in thousands). Gain (loss) recognized in income on derivatives for the three months ended Consolidated Statements of Income March 31, 2021 March 31, 2020 Derivatives not designated as a hedging instrument: Interest rate products Other income $ 400 (819) Credit contracts Other income 23 (1) Total $ 423 (820) Derivatives designated as a hedging instrument: Loss recognized in Interest rate products Interest expense $ 879 106 Total $ 879 106

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Summary of Non-interest Income	The following table presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the three months ended March 31, 2021 and 2020: Three months ended March 31, (in-thousands) 2021 2020 Non-interest income In-scope of Topic 606: Wealth management fees $ 7,134 6,251 Insurance agency income 2,727 — Banking service charges and other fees: Service charges on deposit accounts 2,497 2,977 Debit card and ATM fees 1,778 1,210 Total banking service charges and other fees 4,275 4,187 Total in-scope non-interest income 14,136 10,438 Total out-of-scope non-interest income 7,501 6,553 Total non-interest income $ 21,637 16,991

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Supplemental Balance Sheet Information	The following table represents the consolidated statements of financial condition classification of the Company’s right-of use-assets and lease liabilities at March 31, 2021 and December 31, 2020 (in thousands): Classification March 31, 2021 December 31, 2020 Lease Right-of-Use Assets: Operating lease right-of-use assets Other assets $ 40,960 $ 41,142 Lease Liabilities: Operating lease liabilities Other liabilities $ 42,323 $ 42,042
Schedule of Supplemental Cash Flow and Other information Related to Leases	The following tables represent lease costs and other lease information for the Company's operating leases. The variable lease cost primarily represents variable payments such as common area maintenance and utilities (in thousands): Three months ended March 31, 2021 Three months ended March 31, 2020 Lease Costs Operating lease cost $ 2,812 $ 2,130 Variable lease cost 803 607 Total lease cost $ 3,615 $ 2,737 Cash paid for amounts included in the measurement of lease liabilities: Three months ended March 31, 2021 Three months ended March 31, 2020 Operating cash flows from operating leases $ 2,345 2,125
Schedule of Future Minimum Payments	Future minimum payments for operating leases with initial or remaining terms of one year or more as of March 31, 2021 were as follows (in thousands): Operating leases Twelve months ended: Remainder of 2021 $ 6,472 2022 6,391 2023 5,878 2024 5,475 2025 4,887 Thereafter 20,027 Total future minimum lease payments 49,130 Amounts representing interest 6,807 Present value of net future minimum lease payments $ 42,323

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Net income	$ 48,559	$ 14,931
Basic earnings per share:
Income available to common stockholders, basic	$ 48,559	$ 14,931
Weighted average common shares outstanding, basic (in shares)	76,516,543	64,386,138
Income available to common stockholders, per share amount, basic (usd per share)	$ 0.63	$ 0.23
Dilutive shares (in shares)	64,319	71,125
Diluted earnings per share:
Income available to common stockholders, diluted	$ 48,559	$ 14,931
Weighted average common shares outstanding, diluted (in shares)	76,580,862	64,457,263
Income available to common stockholders, per share amount, diluted (usd per share)	$ 0.63	$ 0.23

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Narrative) (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Anti-dilutive stock options and awards excluded from computation of earnings per share (in shares)	1,200,000	905,673

Business Combinations - SB One

Business Combinations - SB One Bancorp Acquisition (Details) $ in Thousands	Jul. 31, 2020USD ($)numberOfBankingOfficesshares	Mar. 31, 2021USD ($)branch	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)
Business Acquisition [Line Items]
Fair value of acquired loans at July 31, 2020	$ 1,766,115
Excess of consideration paid recorded as goodwill	22,400
Fair value premium	8,400
Allowance for credit losses		$ 85,591	$ 101,466	$ 75,143	$ 55,525	$ 55,525
Number of branches acquired | branch		18
Number of branches owned | branch		8
Subordinated debentures		$ 25,173	$ 25,135
SB One Bancorp
Business Acquisition [Line Items]
Business combination assets acquired	$ 2,195,708
Number of banking offices | numberOfBankingOffices	18
Common stock portion, number of SB One Bancorp stock for each share of company common stock converted | shares	1.357
Common stock, total amount of company stock | shares	12,800,000
Total cost of acquisition	$ 180,800
Fair value premium	133
Allowance for credit losses	13,600
Bank-owned life insurance	37,200
Time deposit discount	4,300
Subordinated debentures	27,500
SB One Bancorp | Core Deposits
Business Acquisition [Line Items]
Intangible asset	$ 3,200
Estimated useful life	10 years
SB One Bancorp | Customer Relationships
Business Acquisition [Line Items]
Intangible asset	$ 6,800
Estimated useful life	13 years
SB One Bancorp | Loans
Business Acquisition [Line Items]
Fair value of acquired loans at July 31, 2020	$ 1,770,000
SB One Bancorp | Deposits
Business Acquisition [Line Items]
Fair value of acquired loans at July 31, 2020	$ 1,760,000

Business Combinations - Estimat

Business Combinations - Estimated Fair Values of the Assets Acquired and the Liabilities Assumed (Details) - SB One Bancorp $ in Thousands	Jul. 31, 2020USD ($)
Assets acquired
Cash and cash equivalents, net	$ 78,089
Available for sale debt securities	231,645
Held to maturity debt securities	12,381
Federal Home Loan Bank stock	11,216
Loans	1,766,115
Allowance for credit losses on PCD loans	(13,586)
Loans, net	1,752,529
Bank-owned life insurance	37,237
Banking premises and equipment	16,620
Accrued interest receivable	8,947
Goodwill	22,439
Other intangibles assets	9,965
Foreclosed assets, net	2,441
Other assets	12,199
Total assets acquired	2,195,708
Liabilities assumed:
Deposits	1,757,777
Borrowed funds	201,582
Subordinated debentures	25,074
Other liabilities	30,447
Total liabilities assumed	2,014,880
Net assets acquired	$ 180,828

Business Combinations - Fair Va

Business Combinations - Fair Value Adjustments Made to the Amortized Cost (Details) $ in Thousands	Jul. 31, 2020USD ($)
Business Acquisition [Line Items]
Gross amortized cost basis at July 31, 2020	$ 1,787,057
Interest rate fair value adjustment on all loans	455
Credit fair value adjustment on non-PCD loans	(21,397)
Fair value of acquired loans at July 31, 2020	1,766,115
Allowance for credit losses on PCD loans	(13,586)
Loans, net	$ 1,752,529

Business Combinations - Summary

Business Combinations - Summary of PCD Loans (Details) - SB One Bancorp $ in Thousands	Jul. 31, 2020USD ($)
Business Acquisition [Line Items]
Fair value of acquired loans at July 31, 2020	$ 315,784
Interest component of expected cash flows (accretable difference)	(7,988)
Allowance for credit losses on PCD loans	(13,586)
Loans, net	$ 294,210

Business Combinations - Tirschw

Business Combinations - Tirschwell & Loewy, Inc Acquisition (Details) $ in Thousands	Jul. 31, 2020USD ($)
Business Acquisition [Line Items]
Assets under management	$ 1,766,115

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2021USD ($)securityposition	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)securityposition	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Available for sale debt securities, at fair value	$ 1,216,936,000		$ 1,105,489,000
Securities held to maturity	$ 447,902,000		$ 450,965,000
Total number of all held to maturity and available for sale securities in an unrealized loss position | security	122		49
Allowance for credit losses	$ 77,000		$ 78,000		$ 0
Retained earnings	748,574,000		718,090,000
Securities available for sale, amortized cost	1,197,401,000		$ 1,073,570,000
Proceeds from sales of securities	9,442,000	$ 0
Loss on sale of securities	$ 0
Securities available for sale, number of securities in an unrealized loss position | position	81		42
Unrealized loss	$ 7,424,000		$ 971,000
Amortized cost, net of allowance for credit losses	447,979,000		451,043,000
Held to maturity securities, proceeds from calls	6,800,000	13,300,000
Held to maturity securities, recognized gain on calls	0	11,000
Held to maturity securities, recognized loss on calls	33,000	0
Investment securities held to maturity, fair value	463,993,000		472,529,000
Allowance for credit losses	$ 85,591,000	$ 75,143,000	$ 101,466,000	$ 55,525,000	$ 55,525,000
Number of securities in an unrealized loss position | security	41		7
AAA
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	$ 66,255,000		$ 65,492,000
Amount of total portfolio	15.00%
AA
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	$ 311,659,000		314,410,000
Amount of total portfolio	70.00%
A
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	$ 58,866,000		59,748,000
Amount of total portfolio	13.00%
A rated or not rated
Schedule of Held-to-maturity Securities [Line Items]
Amount of total portfolio	2.00%
Private Label Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Securities available for sale, amortized cost	$ 17,445
Securities available for sale, number of securities in an unrealized loss position | position	1
Unrealized loss	$ 690
Available-for-sale Securities
Schedule of Held-to-maturity Securities [Line Items]
Proceeds from sales of securities	9,400,000
Gain on sale of securities	230,000
Accounting Standards Update 2016-13
Schedule of Held-to-maturity Securities [Line Items]
Allowance for credit losses				70,000
Allowance for credit losses				7,900,000
Accounting Standards Update 2016-13, Effect On Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Retained earnings				$ 52,000
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Available for sale debt securities, at fair value	1,060,152,000		938,413,000
Securities available for sale, amortized cost	1,042,480,000		910,393,000
Unrealized loss	6,243,000		852,000
Amortized cost, net of allowance for credit losses	50,000		62,000
Held-to-maturity securities, amortized cost	50,000
Investment securities held to maturity, fair value	51,000		64,000
Allowance for credit losses	77,000
Mortgage-backed securities | AAA
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	50,000		62,000
Mortgage-backed securities | AA
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0		0
Mortgage-backed securities | A
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0		$ 0
Investments
Schedule of Held-to-maturity Securities [Line Items]
Available for sale debt securities, at fair value	1,110,000,000
Securities available for sale, amortized cost	$ 1,090,000,000

Investment Securities (Securiti

Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,197,401	$ 1,073,570
Gross unrealized gains	26,959	32,890
Gross unrealized losses	(7,424)	(971)
Available for sale debt securities, at fair value	1,216,936	1,105,489
Agency Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost		1,001
Gross unrealized gains		8
Gross unrealized losses		0
Available for sale debt securities, at fair value		1,009
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,042,480	910,393
Gross unrealized gains	23,915	28,872
Gross unrealized losses	(6,243)	(852)
Available for sale debt securities, at fair value	1,060,152	938,413
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	47,329	52,295
Gross unrealized gains	1,876	1,535
Gross unrealized losses	0	0
Available for sale debt securities, at fair value	49,205	53,830
State And Municipal Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	69,443	69,687
Gross unrealized gains	429	1,666
Gross unrealized losses	(938)	(95)
Available for sale debt securities, at fair value	68,934	71,258
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	38,149	40,194
Gross unrealized gains	739	809
Gross unrealized losses	(243)	(24)
Available for sale debt securities, at fair value	$ 38,645	$ 40,979

Investment Securities (Availabl

Investment Securities (Available for Sale by Contractual Maturity) (Detail) $ in Thousands	Mar. 31, 2021USD ($)
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, amortized cost	$ 0
Due after one year through five years, amortized cost	3,651
Due after five years through ten years, amortized cost	38,002
Due after ten years, amortized cost	65,939
Amortized cost	107,592
Due in one year or less, fair value	0
Due after one year through five years, fair value	3,761
Due after five years through ten years, fair value	38,532
Due after ten years, fair value	65,286
Fair value	$ 107,579

Investment Securities (Disclosu

Investment Securities (Disclosure Regarding Length of Time on Securities Available for Sale with Temporary Impairment) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 393,160	$ 132,875
Less than 12 months, gross unrealized losses	(7,390)	(919)
12 months or longer, fair value	8,110	10,007
12 months or longer, gross unrealized losses	(34)	(52)
Total, fair value	401,270	142,882
Total, gross unrealized losses	(7,424)	(971)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	345,988	127,600
Less than 12 months, gross unrealized losses	(6,209)	(824)
12 months or longer, fair value	8,110	8,007
12 months or longer, gross unrealized losses	(34)	(28)
Total, fair value	354,098	135,607
Total, gross unrealized losses	(6,243)	(852)
State And Municipal Obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	40,517	5,275
Less than 12 months, gross unrealized losses	(938)	(95)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	40,517	5,275
Total, gross unrealized losses	(938)	(95)
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	6,655	0
Less than 12 months, gross unrealized losses	(243)	0
12 months or longer, fair value	0	2,000
12 months or longer, gross unrealized losses	0	(24)
Total, fair value	6,655	2,000
Total, gross unrealized losses	$ (243)	$ (24)

Investment Securities (Held to

Investment Securities (Held to Maturity) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 447,979	$ 451,043
Gross unrealized gains	17,037	21,551
Gross unrealized losses	(1,023)	(65)
Allowance for credit losses	(77)	(78)	$ 0
Held to maturity debt securities	463,993	472,529
Held to maturity debt securities, net (fair value of $463,993 at March 31, 2021 (unaudited) and $472,529 at December 31, 2020)	447,902	450,965
Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	8,998	7,600
Gross unrealized gains	1	6
Gross unrealized losses	(95)	(5)
Held to maturity debt securities	8,904	7,601
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	50	62
Gross unrealized gains	1	2
Gross unrealized losses	0	0
Held to maturity debt securities	51	64
State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	428,631	433,655
Gross unrealized gains	16,970	21,442
Gross unrealized losses	(825)	(58)
Held to maturity debt securities	444,776	455,039
Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	10,300	9,726
Gross unrealized gains	65	101
Gross unrealized losses	(103)	(2)
Allowance for credit losses			$ 0
Held to maturity debt securities	$ 10,262	$ 9,825

Investment Securities (Securi_2

Investment Securities (Securities Held to Maturity by Contractual Maturity) (Detail) $ in Thousands	Mar. 31, 2021USD ($)
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, amortized cost	$ 0
Due after one year through five years, amortized cost	163,682
Due after five years through ten years, amortized cost	213,875
Due after ten years, amortized cost	70,372
Amortized cost	447,929
Due in one year or less, fair value	0
Due after one year through five years, fair value	167,460
Due after five years through ten years, fair value	224,327
Due after ten years, fair value	72,155
Fair value	$ 463,942

Investment Securities - (ASU 20

Investment Securities - (ASU 2016-13 Adoption Impact) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses	$ 77	$ 78		$ 0
Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses			$ 70
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses			70
Corporate Obligations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses				0
Corporate Obligations | Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses			6
Corporate Obligations | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses			6
Municipal Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses				$ 0
Municipal Notes | Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses			64
Municipal Notes | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses			$ 64

Investment Securities (Disclo_2

Investment Securities (Disclosure Regarding Length of Time on Investment Securities with Temporary Impairment) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	$ 32,746	$ 7,627
Less than 12 months, gross unrealized losses	(1,007)	(48)
12 months or longer, fair value	406	406
12 months or longer, gross unrealized losses	(16)	(17)
Total, fair value	33,152	8,033
Total, gross unrealized losses	(1,023)	(65)
Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	6,903	1,995
Less than 12 months, gross unrealized losses	(95)	(5)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	6,903	1,995
Total, gross unrealized losses	(95)	(5)
State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	19,697	4,846
Less than 12 months, gross unrealized losses	(809)	(41)
12 months or longer, fair value	406	406
12 months or longer, gross unrealized losses	(16)	(17)
Total, fair value	20,103	5,252
Total, gross unrealized losses	(825)	(58)
Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	6,146	786
Less than 12 months, gross unrealized losses	(103)	(2)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	6,146	786
Total, gross unrealized losses	$ (103)	$ (2)

Investment Securities (Amortize

Investment Securities (Amortized Cost of held to Maturity Debt Securities by Year of Originations and Credit Rating) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	$ 447,902	$ 450,965
Amortized cost	447,979	451,043
Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	8,998	7,600
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	50	62
State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	428,631	433,655
Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	10,300	9,726
AAA
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	66,255	65,492
AAA | Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	8,998	7,600
AAA | Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	50	62
AAA | State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	57,207	57,830
AAA | Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0	0
AA
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	311,659	314,410
AA | Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0	0
AA | Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0	0
AA | State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	308,572	311,155
AA | Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	3,087	3,255
A
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	58,866	59,748
A | Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0	0
A | Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0	0
A | State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	51,678	53,302
A | Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	7,188	6,446
BBB
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	1,115	1,115
BBB | Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0	0
BBB | Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0	0
BBB | State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	1,115	1,115
BBB | Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0	0
Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	10,084	10,278
Not Rated | Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0	0
Not Rated | Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	0	0
Not Rated | State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	10,059	10,253
Not Rated | Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity	$ 25	$ 25

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Credit Losses (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021USD ($)borrowerSecurityLoancounterpartytroubled_debt_restructuring	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)SecurityLoanborrowertroubled_debt_restructuring	Jul. 31, 2020USD ($)	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gross loans	$ 9,819,643,000		$ 9,839,858,000
Less allowance for credit losses	85,591,000	$ 75,143,000	101,466,000		$ 55,525,000	$ 55,525,000
Retained earnings	748,574,000		718,090,000
Principal amount of nonaccrual loans	82,100,000		87,100,000
Loans less than 90 days past due	$ 27,100,000		$ 35,300,000
Number of loans 90 days past due and still accruing | SecurityLoan	0		0
Impaired loan defined floor limit (greater than)	$ 1,000,000
Impaired loans number | SecurityLoan	167		169
Impaired loans	$ 79,547,000		$ 86,046,000
Number of troubled debt restructurings | troubled_debt_restructuring	115		135
Number of borrowers | borrower	112		110
Loans and leases receivable, impaired, nonperforming, accrual of interest			$ 39,600,000
Collateral-dependent impaired loans	$ 30,100,000		26,300,000
Provision (benefit) charge for credit losses	(15,001,000)	14,717,000
Charge off on TDRs	$ 1,500,000
Number of payment defaults for loans modified as TDRs | SecurityLoan	0
Purchased credit-impaired loans			746,000
Allowances for loan losses	$ 4,802,000		8,974,000
Impaired financing receivable with no related allowance	50,300,000		43,700,000
Average balance of impaired loans	86,426,000		66,763,000
Total gross loans	$ 9,803,536,000		9,822,890,000
Number of PPP loans | counterparty	1,318
Paycheck protection program	$ 664,500,000
Number of PPP loans forgiven | SecurityLoan	670
Paycheck protection program, amount forgiven	$ 182,600,000
Paycheck protection program, amount outstanding	481,900,000
SB One Bancorp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less allowance for credit losses				$ 13,600,000
Purchased credit-impaired (PCI) loans | SB One Bancorp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less allowance for credit losses	10,800,000		13,100,000
Total gross loans	283,900,000		296,600,000
Performing Financial Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases receivable, impaired, nonperforming, accrual of interest	22,700,000		$ 23,100,000
Consumer Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	216,000
Commercial Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	28,300,000
Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	1,600,000
Impaired Loans Troubled Debt Restructurings
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans number | SecurityLoan			112
Allowances for loan losses	0
Commercial Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gross loans	2,510,708,000		$ 2,567,470,000
Less allowance for credit losses	26,302,000	$ 22,841,000	27,084,000		28,263,000	$ 28,263,000
Impaired loans	28,359,000		35,832,000
Allowances for loan losses	3,832,000		4,715,000
Average balance of impaired loans	32,533,000		$ 31,411,000
Commercial Loans | SB One Bancorp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gross loans	$ 101,700,000
Accounting Standards Update 2016-13
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less allowance for credit losses					7,900,000
Accounting Standards Update 2016-13, Effect On Loans Receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Retained earnings					$ 5,900,000

Loans Receivable and Allowanc_4

Loans Receivable and Allowance for Credit Losses (Schedule of Summarized Loans Receivable) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 9,819,643	$ 9,839,858
Premiums on purchased loans	1,378	1,566
Unearned discounts	(7)	(12)
Net deferred fees	(17,478)	(18,522)
Total loans	9,803,536	9,822,890
Mortgage Portfolio Segment
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	6,945,287	6,779,822
Mortgage Portfolio Segment | Residential
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,277,376	1,294,702
Mortgage Portfolio Segment | Commercial
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	3,594,012	3,458,666
Mortgage Portfolio Segment | Multi-Family
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,458,193	1,484,515
Mortgage Portfolio Segment | Construction
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	615,706	541,939
Commercial Loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	2,510,708	2,567,470
Consumer Loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 363,648	$ 492,566

Loans Receivable and Allowanc_5

Loans Receivable and Allowance for Credit Losses (Summary of Aging Loans Receivable by Portfolio Segment and Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 82,084	$ 87,090
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	104,177	125,100
Current	9,715,466	9,714,758
Total loans	9,819,643	9,839,858
Non-accrual loans with no related allowance	67,339	49,013
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	13,244	22,762
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	8,849	15,248
Mortgage Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	43,032	42,689
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	62,864	68,995
Current	6,882,423	6,710,827
Total loans	6,945,287	6,779,822
Non-accrual loans with no related allowance	43,032	31,189
Mortgage Portfolio Segment | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	7,797	9,315
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	20,820	33,956
Current	1,256,556	1,260,746
Total loans	1,277,376	1,294,702
Non-accrual loans with no related allowance	7,797	9,315
Mortgage Portfolio Segment | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	33,742	31,982
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	36,445	32,856
Current	3,557,567	3,425,810
Total loans	3,594,012	3,458,666
Non-accrual loans with no related allowance	33,742	20,482
Mortgage Portfolio Segment | Multi-Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	101	0
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	1,428	791
Current	1,456,765	1,483,724
Total loans	1,458,193	1,484,515
Non-accrual loans with no related allowance	101	0
Mortgage Portfolio Segment | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,392	1,392
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	4,171	1,392
Current	611,535	540,547
Total loans	615,706	541,939
Non-accrual loans with no related allowance	1,392	1,392
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	11,495	16,756
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	6,862	15,789
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	2,183	761
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Multi-Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	1,327	206
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	1,123	0
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	8,337	9,550
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	6,161	8,852
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	520	113
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Multi-Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	0	585
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	1,656	0
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	36,042	42,118
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	36,670	44,955
Current	2,474,038	2,522,515
Total loans	2,510,708	2,567,470
Non-accrual loans with no related allowance	21,298	15,541
Commercial Loans | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	393	1,658
Commercial Loans | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	235	1,179
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	3,010	2,283
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	4,643	11,150
Current	359,005	481,416
Total loans	363,648	492,566
Non-accrual loans with no related allowance	3,009	2,283
Consumer Loans | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	1,356	4,348
Consumer Loans | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	$ 277	$ 4,519

Loans Receivable and Allowanc_6

Loans Receivable and Allowance for Credit Losses (Schedule of Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 101,466	$ 55,525
Provision benefit to operations	(15,000)	14,700
Retained earnings (due to initial CECL adoption)		7,920
Recoveries of loans previously charged-off	1,107	529
Loans charged-off	(1,982)	(3,531)
Balance at end of period	85,591	75,143
Mortgage Portfolio Segment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	68,307	25,511
Provision benefit to operations	(13,467)	7,710
Retained earnings (due to initial CECL adoption)		14,188
Recoveries of loans previously charged-off	276	93
Loans charged-off	(918)	(2)
Balance at end of period	54,198	47,500
Commercial Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	27,084	28,263
Provision benefit to operations	(467)	7,619
Retained earnings (due to initial CECL adoption)		(9,974)
Recoveries of loans previously charged-off	528	313
Loans charged-off	(843)	(3,380)
Balance at end of period	26,302	22,841
Consumer Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	6,075	1,751
Provision benefit to operations	(1,066)	(629)
Retained earnings (due to initial CECL adoption)		3,706
Recoveries of loans previously charged-off	303	123
Loans charged-off	(221)	(149)
Balance at end of period	$ 5,091	$ 4,802

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Credit Losses (Impact of ASC 326 Adoption) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses	$ 85,591	$ 101,466	$ 75,143	$ 55,525	$ 55,525
Mortgage Portfolio
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				25,511
Mortgage Portfolio | Residential
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				3,414
Mortgage Portfolio | Commercial
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				12,831
Mortgage Portfolio | Multifamily
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				3,374
Mortgage Portfolio | Construction
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				5,892
Commercial Loans
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses	26,302	27,084	22,841	28,263	28,263
Consumer Loans
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses	$ 5,091	$ 6,075	$ 4,802	1,751	$ 1,751
Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				63,445
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				39,739
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Residential
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				8,950
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Commercial
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				17,118
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Multifamily
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				9,519
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Construction
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				4,152
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial Loans
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				18,254
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer Loans
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				5,452
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				7,920
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				14,228
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Residential
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				5,536
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Commercial
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				4,287
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Multifamily
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				6,145
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Construction
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				(1,740)
Cumulative Effect, Period of Adoption, Adjustment | Commercial Loans
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				(10,009)
Cumulative Effect, Period of Adoption, Adjustment | Consumer Loans
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses				$ 3,701

Loans Receivable and Allowanc_8

Loans Receivable and Allowance for Credit Losses (Summary of Loans Receivable by Portfolio Segment and Impairment Method) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 79,547	$ 86,046
Collectively evaluated for impairment	9,740,096	9,753,812
Total loans	9,819,643	9,839,858
Mortgage Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	49,783	48,783
Collectively evaluated for impairment	6,895,504	6,731,039
Total loans	6,945,287	6,779,822
Commercial Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	28,359	35,832
Collectively evaluated for impairment	2,482,349	2,531,638
Total loans	2,510,708	2,567,470
Consumer Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	1,405	1,431
Collectively evaluated for impairment	362,243	491,135
Total loans	$ 363,648	$ 492,566

Loans Receivable and Allowanc_9

Loans Receivable and Allowance for Credit Losses (Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 4,802	$ 8,974
Collectively evaluated for impairment	80,789	92,492
Total	85,591	101,466	$ 75,143	$ 55,525	$ 55,525
Mortgage Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	927	4,220
Collectively evaluated for impairment	53,271	64,087
Total	54,198	68,307	47,500		25,511
Commercial Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	3,832	4,715
Collectively evaluated for impairment	22,470	22,369
Total	26,302	27,084	22,841	28,263	28,263
Consumer Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	43	39
Collectively evaluated for impairment	5,048	6,036
Total	$ 5,091	$ 6,075	$ 4,802	$ 1,751	$ 1,751

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Credit Losses (Schedule of Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)counterparty	Mar. 31, 2020USD ($)counterparty
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | counterparty	3	2
Pre-Modification Outstanding Recorded  Investment	$ 1,361	$ 746
Post-Modification Outstanding Recorded Investment	$ 1,359	$ 731
Commercial Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | counterparty	3	2
Pre-Modification Outstanding Recorded  Investment	$ 1,361	$ 746
Post-Modification Outstanding Recorded Investment	$ 1,359	$ 731

Loans Receivable and Allowan_11

Loans Receivable and Allowance for Credit Losses (Schedule of Trouble Debt Restructuring Subsequently Defaulted) (Details)	3 Months Ended
	Mar. 31, 2021SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of payment defaults for loans modified as TDRs	0

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Credit Losses (Summary of PCD Loans) (Details) - SB One Bancorp $ in Thousands	Jul. 31, 2020USD ($)
Financing Receivable, Recorded Investment [Line Items]
Fair value of acquired loans at July 31, 2020	$ 315,784
Interest rate fair value adjustment on all loans	7,988
Fair value of PCD loans	307,796
Allowance for credit losses on PCD loans	13,586
Loans, net	$ 294,210

Loans Receivable and Allowan_13

Loans Receivable and Allowance for Credit Losses (Summary of Impaired Loans Receivable by Class) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	$ 59,382	$ 48,672
Loans with no related allowance, Recorded Investment	50,270	43,683
Loans with no related allowance, Average Recorded Investment	53,039	40,411
Loans with no related allowance, Interest Income Recognized	148	667
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	33,018	48,455
Loans with an allowance recorded, Recorded Investment	29,277	42,363
Loans with an allowance recorded, Average Recorded Investment	33,387	26,352
Loans with an allowance recorded, Interest Income Recognized	223	1,208
Total impaired loans
Unpaid Principal Balance	92,400	97,127
Recorded Investment	79,547	86,046
Related Allowance	4,802	8,974
Average Recorded Investment	86,426	66,763
Interest Income Recognized	371	1,875
Mortgage Portfolio Segment
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	46,392	31,395
Loans with no related allowance, Recorded Investment	40,450	28,794
Loans with no related allowance, Average Recorded Investment	41,638	27,613
Loans with no related allowance, Interest Income Recognized	135	571
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	9,833	22,943
Loans with an allowance recorded, Recorded Investment	9,333	19,989
Loans with an allowance recorded, Average Recorded Investment	9,386	7,727
Loans with an allowance recorded, Interest Income Recognized	90	877
Total impaired loans
Unpaid Principal Balance	56,225	54,338
Recorded Investment	49,783	48,783
Related Allowance	927	4,220
Average Recorded Investment	51,024	35,340
Interest Income Recognized	225	1,448
Mortgage Portfolio Segment | Residential
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	12,267	13,981
Loans with no related allowance, Recorded Investment	9,794	11,380
Loans with no related allowance, Average Recorded Investment	10,083	11,587
Loans with no related allowance, Interest Income Recognized	118	511
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	8,938	7,950
Loans with an allowance recorded, Recorded Investment	8,438	7,506
Loans with an allowance recorded, Average Recorded Investment	8,461	7,604
Loans with an allowance recorded, Interest Income Recognized	77	307
Total impaired loans
Unpaid Principal Balance	21,205	21,931
Recorded Investment	18,232	18,886
Related Allowance	904	806
Average Recorded Investment	18,544	19,191
Interest Income Recognized	195	818
Mortgage Portfolio Segment | Commercial
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	34,125	17,414
Loans with no related allowance, Recorded Investment	30,656	17,414
Loans with no related allowance, Average Recorded Investment	31,555	16,026
Loans with no related allowance, Interest Income Recognized	17	60
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	895	14,993
Loans with an allowance recorded, Recorded Investment	895	12,483
Loans with an allowance recorded, Average Recorded Investment	925	123
Loans with an allowance recorded, Interest Income Recognized	13	570
Total impaired loans
Unpaid Principal Balance	35,020	32,407
Recorded Investment	31,551	29,897
Related Allowance	23	3,414
Average Recorded Investment	32,480	16,149
Interest Income Recognized	30	630
Commercial Loans
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	11,630	15,895
Loans with no related allowance, Recorded Investment	8,963	14,009
Loans with no related allowance, Average Recorded Investment	9,082	12,791
Loans with no related allowance, Interest Income Recognized	0	46
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	22,622	24,947
Loans with an allowance recorded, Recorded Investment	19,396	21,823
Loans with an allowance recorded, Average Recorded Investment	23,451	18,620
Loans with an allowance recorded, Interest Income Recognized	123	311
Total impaired loans
Unpaid Principal Balance	34,252	40,842
Recorded Investment	28,359	35,832
Related Allowance	3,832	4,715
Average Recorded Investment	32,533	31,411
Interest Income Recognized	123	357
Consumer Loans
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	1,360	1,382
Loans with no related allowance, Recorded Investment	857	880
Loans with no related allowance, Average Recorded Investment	2,319	7
Loans with no related allowance, Interest Income Recognized	13	50
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	563	565
Loans with an allowance recorded, Recorded Investment	548	551
Loans with an allowance recorded, Average Recorded Investment	550	5
Loans with an allowance recorded, Interest Income Recognized	10	20
Total impaired loans
Unpaid Principal Balance	1,923	1,947
Recorded Investment	1,405	1,431
Related Allowance	43	39
Average Recorded Investment	2,869	12
Interest Income Recognized	$ 23	$ 70

Loans Receivable and Allowan_14

Loans Receivable and Allowance for Credit Losses (Summary of COVID-19 Impact) (Details) - USD ($) $ in Thousands	Apr. 20, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans		$ 9,803,536	$ 9,822,890
First 90-day Deferral Period | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 300
Second 90-Day Deferral Period, Expected To Be Granted | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	46,600
Completed Deferral Period | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	85,100
Loans In Deferral, Total Amount | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	123,500
Principal Only Deferral | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 119,000
Percentage of total loans	96.40%
Hotel | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 40,900
Multifamily | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	33,100
Retail Properties | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	8,600
Restaurants | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	6,500
Residential | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	8,500
Payment Deferral | Maximum | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 1,310,000
Percentage of total loans	16.80%
Payment Deferral | Minimum | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 132,000
Percentage of total loans	1.30%

Loans Receivable and Allowan_15

Loans Receivable and Allowance for Credit Losses (Summary of Loans Receivable by Credit Quality Risk Rating Indicator) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
2021	$ 468,843
2020	1,991,107
2019	1,574,207
2018	1,152,030
2017 and prior	4,633,456
Total gross loans	9,819,643	$ 9,839,858
Criticized
Financing Receivable, Recorded Investment [Line Items]
2021	414
2020	4,318
2019	73,074
2018	83,889
2017 and prior	419,475
Criticized and classified loans, gross	132,000
Total gross loans	581,170	605,963
Special Mention
Financing Receivable, Recorded Investment [Line Items]
2021	23
2020	2,331
2019	56,658
2018	65,953
2017 and prior	187,375
Total gross loans	312,340	340,617
Substandard
Financing Receivable, Recorded Investment [Line Items]
2021	391
2020	1,987
2019	16,416
2018	17,936
2017 and prior	232,080
Total gross loans	268,810	265,294
Doubtful
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	20
Total gross loans	20	52
Loss
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
2021	468,429
2020	1,986,789
2019	1,501,133
2018	1,068,141
2017 and prior	4,213,981
Total gross loans	9,238,473	9,233,895
Mortgage Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
2021	207,437
2020	1,354,272
2019	1,262,944
2018	868,673
2017 and prior	3,251,961
Total gross loans	6,945,287	6,779,822
Mortgage Portfolio Segment | Criticized
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	2,149
2019	54,038
2018	73,623
2017 and prior	206,775
Total gross loans	336,585	313,126
Mortgage Portfolio Segment | Special Mention
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	1,986
2019	47,839
2018	62,375
2017 and prior	83,992
Total gross loans	196,192	181,670
Mortgage Portfolio Segment | Substandard
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	163
2019	6,199
2018	11,248
2017 and prior	122,783
Total gross loans	140,393	131,456
Mortgage Portfolio Segment | Doubtful
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Mortgage Portfolio Segment | Loss
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Mortgage Portfolio Segment | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
2021	207,437
2020	1,352,123
2019	1,208,906
2018	795,050
2017 and prior	3,045,186
Total gross loans	6,608,702	6,466,696
Mortgage Portfolio Segment | Residential
Financing Receivable, Recorded Investment [Line Items]
2021	82,831
2020	262,195
2019	144,385
2018	84,489
2017 and prior	703,476
Total gross loans	1,277,376	1,294,702
Mortgage Portfolio Segment | Residential | Criticized
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	163
2019	4,434
2018	3,169
2017 and prior	21,497
Total gross loans	29,263	29,533
Mortgage Portfolio Segment | Residential | Special Mention
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	661
2018	2,425
2017 and prior	2,761
Total gross loans	5,847	2,882
Mortgage Portfolio Segment | Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	163
2019	3,773
2018	744
2017 and prior	18,736
Total gross loans	23,416	26,651
Mortgage Portfolio Segment | Residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Mortgage Portfolio Segment | Residential | Loss
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Mortgage Portfolio Segment | Residential | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
2021	82,831
2020	262,032
2019	139,951
2018	81,320
2017 and prior	681,979
Total gross loans	1,248,113	1,265,169
Mortgage Portfolio Segment | Commercial
Financing Receivable, Recorded Investment [Line Items]
2021	78,552
2020	670,040
2019	664,820
2018	430,288
2017 and prior	1,750,312
Total gross loans	3,594,012	3,458,666
Mortgage Portfolio Segment | Commercial | Criticized
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	32,736
2018	45,208
2017 and prior	160,796
Total gross loans	238,740	222,944
Mortgage Portfolio Segment | Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	30,310
2018	39,825
2017 and prior	58,916
Total gross loans	129,051	124,631
Mortgage Portfolio Segment | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	2,426
2018	5,383
2017 and prior	101,880
Total gross loans	109,689	98,313
Mortgage Portfolio Segment | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Mortgage Portfolio Segment | Commercial | Loss
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Mortgage Portfolio Segment | Commercial | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
2021	78,552
2020	670,040
2019	632,084
2018	385,080
2017 and prior	1,589,516
Total gross loans	3,355,272	3,235,722
Mortgage Portfolio Segment | Multi-Family
Financing Receivable, Recorded Investment [Line Items]
2021	31,141
2020	296,124
2019	178,327
2018	203,468
2017 and prior	749,133
Total gross loans	1,458,193	1,484,515
Mortgage Portfolio Segment | Multi-Family | Criticized
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	679
2018	20,125
2017 and prior	16,633
Total gross loans	37,437	31,349
Mortgage Portfolio Segment | Multi-Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	679
2018	20,125
2017 and prior	15,081
Total gross loans	35,885	29,781
Mortgage Portfolio Segment | Multi-Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	1,552
Total gross loans	1,552	1,568
Mortgage Portfolio Segment | Multi-Family | Doubtful
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Mortgage Portfolio Segment | Multi-Family | Loss
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Mortgage Portfolio Segment | Multi-Family | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
2021	31,141
2020	296,124
2019	177,648
2018	183,343
2017 and prior	732,500
Total gross loans	1,420,756	1,453,166
Mortgage Portfolio Segment | Construction
Financing Receivable, Recorded Investment [Line Items]
2021	14,913
2020	125,913
2019	275,412
2018	150,428
2017 and prior	49,040
Total gross loans	615,706	541,939
Mortgage Portfolio Segment | Construction | Criticized
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	1,986
2019	16,189
2018	5,121
2017 and prior	7,849
Total gross loans	31,145	29,300
Mortgage Portfolio Segment | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	1,986
2019	16,189
2018	0
2017 and prior	7,234
Total gross loans	25,409	24,376
Mortgage Portfolio Segment | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	5,121
2017 and prior	615
Total gross loans	5,736	4,924
Mortgage Portfolio Segment | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Mortgage Portfolio Segment | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Mortgage Portfolio Segment | Construction | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
2021	14,913
2020	123,927
2019	259,223
2018	145,307
2017 and prior	41,191
Total gross loans	584,561	512,639
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
2021	252,459
2020	597,728
2019	264,747
2018	239,109
2017 and prior	1,156,665
Total gross loans	2,510,708	2,567,470
Commercial Loans | Criticized
Financing Receivable, Recorded Investment [Line Items]
2021	414
2020	2,169
2019	18,675
2018	10,146
2017 and prior	208,816
Total gross loans	240,220	284,224
Commercial Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
2021	23
2020	345
2019	8,819
2018	3,578
2017 and prior	102,854
Total gross loans	115,619	157,080
Commercial Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
2021	391
2020	1,824
2019	9,856
2018	6,568
2017 and prior	105,942
Total gross loans	124,581	127,092
Commercial Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	20
Total gross loans	20	52
Commercial Loans | Loss
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Commercial Loans | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
2021	252,045
2020	595,559
2019	246,072
2018	228,963
2017 and prior	947,849
Total gross loans	2,270,488	2,283,246
Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
2021	8,947
2020	39,107
2019	46,516
2018	44,248
2017 and prior	224,830
Total gross loans	363,648	492,566
Consumer Loans | Criticized
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	361
2018	120
2017 and prior	3,884
Total gross loans	4,365	8,613
Consumer Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	529
Total gross loans	529	1,867
Consumer Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	361
2018	120
2017 and prior	3,355
Total gross loans	3,836	6,746
Consumer Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Consumer Loans | Loss
Financing Receivable, Recorded Investment [Line Items]
2021	0
2020	0
2019	0
2018	0
2017 and prior	0
Total gross loans	0	0
Consumer Loans | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
2021	8,947
2020	39,107
2019	46,155
2018	44,128
2017 and prior	220,946
Total gross loans	$ 359,283	$ 483,953

Deposits (Detail)

Deposits (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]
Savings	$ 1,402,363	$ 1,348,147
Money market	2,345,640	2,245,412
NOW	3,075,098	2,808,637
Non-interest bearing	2,511,408	2,341,459
Certificates of deposit	963,004	1,094,174
Total deposits	$ 10,297,513	$ 9,837,829

Components of Net Periodic Be_3

Components of Net Periodic Benefit Cost (Narrative) (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2006	Dec. 31, 2002
Retirement Benefits [Abstract]
Service period for employees of coverage age, years (at least)	1 year
Defined benefit plan, percentage vested	100.00%
Retiree benefits eliminated if less than service period, years (less than)		10 years	10 years
Defined benefit plan, contributions by employer	$ 0

Components of Net Periodic Be_4

Components of Net Periodic Benefit Cost (Benefit Cost (Increase) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension benefits
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 0	$ 0
Interest cost	198	250
Expected return on plan assets	(807)	(737)
Amortization of prior service cost	0	0
Amortization of the net loss (gain)	118	174
Net periodic (benefit) increase cost	(491)	(313)
Other post-retirement benefits
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	9	20
Interest cost	106	178
Expected return on plan assets	0	0
Amortization of prior service cost	0	0
Amortization of the net loss (gain)	(268)	(62)
Net periodic (benefit) increase cost	$ (153)	$ 136

Allowance for Credit Losses o_3

Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for credit losses for off-balance sheet credit exposure	$ 4,100		$ 5,000	$ 0
Retained earnings	748,574		$ 718,090
Provision (benefit) charge for credit losses	(15,001)	$ 14,717
Credit loss (benefit) expense for off-balance sheet credit exposures	$ 875	$ (1,000)
Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for credit losses for off-balance sheet credit exposure				3,206
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for credit losses for off-balance sheet credit exposure				3,206
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for credit losses for off-balance sheet credit exposure				3,200
Accounting Standards Update 2016-13, Effect On Off-Balance Sheet Items
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings				$ 2,400

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) $ in Thousands	Mar. 31, 2021USD ($)security	Dec. 31, 2020USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted cash	$ 42,600	$ 114,300
Available for sale debt securities:	1,216,936	1,105,489
Subordinated debentures	25,173	25,135
Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,216,936	1,105,489
Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	1,009
Subordinated debentures	0	0
Quoted Prices in Active  Markets for Identical Assets (Level 1) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	1,009
Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,216,936	1,104,480
Subordinated debentures	30,325	24,375
Significant Other Observable  Inputs (Level 2) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,216,936	1,104,480
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Subordinated debentures	0	0
Significant Unobservable Inputs (Level 3) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Agency Obligations | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		1,009
Agency Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		1,009
Agency Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		1,009
Agency Obligations | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		0
Agency Obligations | Significant Other Observable  Inputs (Level 2) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		0
Agency Obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		0
Agency Obligations | Significant Unobservable Inputs (Level 3) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		0
Mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,060,152	938,413
Mortgage-backed securities | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,060,152	938,413
Mortgage-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Mortgage-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Mortgage-backed securities | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,060,152	938,413
Mortgage-backed securities | Significant Other Observable  Inputs (Level 2) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,060,152	938,413
Mortgage-backed securities | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Mortgage-backed securities | Significant Unobservable Inputs (Level 3) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	49,205	53,830
Asset-backed securities | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	49,205	53,830
Asset-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:
Asset-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0
Asset-backed securities | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	49,205	53,830
Asset-backed securities | Significant Other Observable  Inputs (Level 2) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	49,205	53,830
Asset-backed securities | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:
Asset-backed securities | Significant Unobservable Inputs (Level 3) | Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,216,936	1,105,489
Subordinated debentures	25,173	25,135
Carrying Value | Agency Obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		1,009
Carrying Value | Mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,060,152	938,413
Carrying Value | Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	49,205	53,830
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,216,936	1,105,489
Subordinated debentures	30,325	24,375
Fair Value | Agency Obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		1,009
Fair Value | Mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,060,152	938,413
Fair Value | Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	$ 49,205	$ 53,830
Valuation, Market Approach | Measurement Input, Cost to Sell | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, measurement input | security	0.05
Foreclosed assets, measurement input | security	0.05
Valuation, Market Approach | Measurement Input, Cost to Sell | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, measurement input | security	0.10
Foreclosed assets, measurement input | security	0.10

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	$ 1,216,936	$ 1,105,489
Equity securities	1,026	971
Derivative liabilities	38,500
Foreclosed assets	3,554	4,475
Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	1,009
Equity securities	1,026	971
Derivative assets	0	0
Derivative liabilities	0	0
Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,216,936	1,104,480
Equity securities	0	0
Derivative assets	76,542	101,079
Derivative liabilities	78,228	109,148
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Equity securities	0	0
Derivative assets	0	0
Derivative liabilities	0	0
Agency Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		1,009
Agency Obligations | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		0
Agency Obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		0
Mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,060,152	938,413
Mortgage-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Mortgage-backed securities | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,060,152	938,413
Mortgage-backed securities | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	49,205	53,830
Asset-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:
Asset-backed securities | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	49,205	53,830
Asset-backed securities | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:
State And Municipal Obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	68,934	71,258
State And Municipal Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
State And Municipal Obligations | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	68,934	71,258
State And Municipal Obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Corporate Obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	38,645	40,979
Corporate Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Corporate Obligations | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	38,645	40,979
Corporate Obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,216,936	1,105,489
Equity securities	1,026	971
Derivative assets	76,542	101,079
Total assets at fair value	1,294,504	1,207,539
Derivative liabilities	78,228	109,148
Measured on a Recurring Basis | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	1,009
Equity securities	1,026	971
Derivative assets	0	0
Total assets at fair value	1,026	1,980
Derivative liabilities	0	0
Measured on a Recurring Basis | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,216,936	1,104,480
Equity securities	0	0
Derivative assets	76,542	101,079
Total assets at fair value	1,293,478	1,205,559
Derivative liabilities	78,228	109,148
Measured on a Recurring Basis | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Equity securities	0	0
Derivative assets	0	0
Total assets at fair value	0	0
Derivative liabilities	0	0
Measured on a Recurring Basis | Agency Obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		1,009
Measured on a Recurring Basis | Agency Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		1,009
Measured on a Recurring Basis | Agency Obligations | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		0
Measured on a Recurring Basis | Agency Obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:		0
Measured on a Recurring Basis | Mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,060,152	938,413
Measured on a Recurring Basis | Mortgage-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Measured on a Recurring Basis | Mortgage-backed securities | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,060,152	938,413
Measured on a Recurring Basis | Mortgage-backed securities | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Measured on a Recurring Basis | Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	49,205	53,830
Measured on a Recurring Basis | Asset-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0
Measured on a Recurring Basis | Asset-backed securities | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	49,205	53,830
Measured on a Recurring Basis | Asset-backed securities | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0
Measured on a Recurring Basis | State And Municipal Obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	68,934	71,258
Measured on a Recurring Basis | State And Municipal Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Measured on a Recurring Basis | State And Municipal Obligations | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	68,934	71,258
Measured on a Recurring Basis | State And Municipal Obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Measured on a Recurring Basis | Corporate Obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	38,645	40,979
Measured on a Recurring Basis | Corporate Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Measured on a Recurring Basis | Corporate Obligations | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	38,645	40,979
Measured on a Recurring Basis | Corporate Obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Measured on a Non-Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets at fair value	33,674	30,725
Loans measured for impairment based on the fair value of the underlying collateral	30,120	26,250
Foreclosed assets	3,554	4,475
Measured on a Non-Recurring Basis | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets at fair value	0	0
Loans measured for impairment based on the fair value of the underlying collateral	0	0
Foreclosed assets	0	0
Measured on a Non-Recurring Basis | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets at fair value	0	0
Loans measured for impairment based on the fair value of the underlying collateral	0	0
Foreclosed assets	0	0
Measured on a Non-Recurring Basis | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets at fair value	33,674	30,725
Loans measured for impairment based on the fair value of the underlying collateral	30,120	26,250
Foreclosed assets	$ 3,554	$ 4,475

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financial assets:
Cash and cash equivalents	$ 687,570	$ 532,353
Available for sale debt securities, at fair value	1,216,936	1,105,489
Investment securities held to maturity, fair value	463,993	472,529
Federal Home Loan Bank stock	48,998	59,489
Equity securities	1,026	971
Total loans	9,717,945	9,721,424
Financial liabilities:
Certificates of deposit	963,004	1,094,174
Total deposits	10,297,513	9,837,829
Borrowed funds	940,611	1,175,972
Subordinated debentures	25,173	25,135
Derivative liabilities	38,500
Quoted Prices in Active  Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	687,570	532,353
Available for sale debt securities, at fair value	0	1,009
Investment securities held to maturity, fair value	8,904	7,601
Federal Home Loan Bank stock	48,998	59,489
Equity securities	1,026	971
Total loans	0	0
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	9,334,509	8,743,655
Certificates of deposit	0	0
Total deposits	9,334,509	8,743,655
Borrowed funds	0	0
Subordinated debentures	0	0
Derivative liabilities	0	0
Significant Other Observable  Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Available for sale debt securities, at fair value	1,216,936	1,104,480
Investment securities held to maturity, fair value	455,089	464,850
Federal Home Loan Bank stock	0	0
Equity securities	0	0
Total loans	0	0
Derivative assets	76,542	101,079
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	967,088	1,097,993
Total deposits	967,088	1,097,993
Borrowed funds	945,538	1,193,024
Subordinated debentures	30,325	24,375
Derivative liabilities	78,228	109,148
Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Federal Home Loan Bank stock	0	0
Equity securities	0	0
Total loans	9,857,891	9,969,330
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	0	0
Total deposits	0	0
Borrowed funds	0	0
Subordinated debentures	0	0
Derivative liabilities	0	0
US Treasury Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value		0
US Treasury Obligations | Significant Other Observable  Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value		0
US Treasury Obligations | Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value		0
Agency Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value		1,009
Investment securities held to maturity, fair value	8,904	7,601
Agency Obligations | Significant Other Observable  Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value		0
Investment securities held to maturity, fair value	0	0
Agency Obligations | Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value		0
Investment securities held to maturity, fair value	0	0
Mortgage-backed securities
Financial assets:
Available for sale debt securities, at fair value	1,060,152	938,413
Investment securities held to maturity, fair value	51	64
Mortgage-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Mortgage-backed securities | Significant Other Observable  Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value	1,060,152	938,413
Investment securities held to maturity, fair value	51	64
Mortgage-backed securities | Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Asset-backed securities
Financial assets:
Available for sale debt securities, at fair value	49,205	53,830
Asset-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value
Asset-backed securities | Significant Other Observable  Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value	49,205	53,830
Asset-backed securities | Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value
State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	68,934	71,258
Investment securities held to maturity, fair value	444,776	455,039
State And Municipal Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
State And Municipal Obligations | Significant Other Observable  Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value	68,934	71,258
Investment securities held to maturity, fair value	444,776	454,973
State And Municipal Obligations | Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	38,645	40,979
Investment securities held to maturity, fair value	10,262	9,825
Corporate Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Corporate Obligations | Significant Other Observable  Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value	38,645	40,979
Investment securities held to maturity, fair value	10,262	9,813
Corporate Obligations | Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Carrying Value
Financial assets:
Cash and cash equivalents		532,353	$ 687,570
Available for sale debt securities, at fair value	1,216,936	1,105,489
Investment securities held to maturity, fair value	447,902	450,965
Federal Home Loan Bank stock	48,998	59,489
Equity securities	1,026	971
Total loans	9,717,945	9,721,424
Derivative assets	76,542	101,079
Financial liabilities:
Deposits other than certificates of deposits	9,334,509	8,743,655
Certificates of deposit	963,004	1,094,174
Total deposits	10,297,513	9,837,829
Borrowed funds	940,611	1,175,972
Subordinated debentures	25,173	25,135
Derivative liabilities	78,228	109,148
Carrying Value | US Treasury Obligations
Financial assets:
Available for sale debt securities, at fair value
Carrying Value | Agency Obligations
Financial assets:
Available for sale debt securities, at fair value		1,009
Investment securities held to maturity, fair value	8,998	7,600
Carrying Value | Mortgage-backed securities
Financial assets:
Available for sale debt securities, at fair value	1,060,152	938,413
Investment securities held to maturity, fair value	50	62
Carrying Value | Asset-backed securities
Financial assets:
Available for sale debt securities, at fair value	49,205	53,830
Carrying Value | State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	68,934	71,258
Investment securities held to maturity, fair value	428,571	433,589
Carrying Value | Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	38,645	40,979
Investment securities held to maturity, fair value	10,283	9,714
Fair Value
Financial assets:
Cash and cash equivalents	687,570	532,353
Available for sale debt securities, at fair value	1,216,936	1,105,489
Investment securities held to maturity, fair value	463,993	472,451
Federal Home Loan Bank stock	48,998	59,489
Equity securities	1,026	971
Total loans	9,857,891	9,969,330
Derivative assets	76,542	101,079
Financial liabilities:
Deposits other than certificates of deposits	9,334,509	8,743,655
Certificates of deposit	967,088	1,097,993
Total deposits	10,301,597	9,841,648
Borrowed funds	945,538	1,193,024
Subordinated debentures	30,325	24,375
Derivative liabilities	78,228	109,148
Fair Value | US Treasury Obligations
Financial assets:
Available for sale debt securities, at fair value		0
Fair Value | Agency Obligations
Financial assets:
Available for sale debt securities, at fair value		1,009
Investment securities held to maturity, fair value	8,904	7,601
Fair Value | Mortgage-backed securities
Financial assets:
Available for sale debt securities, at fair value	1,060,152	938,413
Investment securities held to maturity, fair value	51	64
Fair Value | Asset-backed securities
Financial assets:
Available for sale debt securities, at fair value	49,205	53,830
Fair Value | State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	68,934	71,258
Investment securities held to maturity, fair value	444,776	454,973
Fair Value | Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	38,645	40,979
Investment securities held to maturity, fair value	$ 10,262	$ 9,813

Other Comprehensive Income (Com

Other Comprehensive Income (Components of OCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	$ (12,152)	$ 22,563
Reclassification adjustment for gains included in net income	(230)	0
Total	(12,382)	22,563
Unrealized gains (losses) on derivatives (cash flow hedges)	6,226	(7,697)
Amortization related to post-retirement obligations	(150)	112
Total other comprehensive (loss) income	(6,306)	14,978
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	3,133	(5,817)
Reclassification adjustment for gains included in net income	59	0
Total	3,192	(5,817)
Unrealized gains (losses) on derivatives (cash flow hedges)	(1,605)	1,984
Amortization related to post-retirement obligations	41	(28)
Total other comprehensive (loss) income	1,628	(3,861)
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	(9,019)	16,746
Reclassification adjustment for gains included in net income	(171)	0
Total	(9,190)	16,746
Unrealized gains (losses) on derivatives (cash flow hedges)	4,621	(5,713)
Amortization related to post-retirement obligations	(109)	84
Total other comprehensive (loss) income	$ (4,678)	$ 11,117

Other Comprehensive Income (C_2

Other Comprehensive Income (Components of AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,619,797	$ 1,413,840
Current - period other comprehensive (loss) income	(4,678)	11,117
Ending Balance	1,647,231	1,412,589
Unrealized Gains (Losses) on Available for Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	23,690	8,746
Current - period other comprehensive (loss) income	(9,190)	16,746
Ending Balance	14,500	25,492
Post- Retirement Obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,081)	(5,240)
Current - period other comprehensive (loss) income	(109)	84
Ending Balance	(1,190)	(5,156)
Unrealized (Losses) Gains on Derivatives (cash flow hedges)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,954)	315
Current - period other comprehensive (loss) income	4,621	(5,713)
Ending Balance	(333)	(5,398)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	17,655	3,821
Current - period other comprehensive (loss) income	(4,678)	11,117
Ending Balance	$ 12,977	$ 14,938

Other Comprehensive Income (Rec

Other Comprehensive Income (Reclassifications Out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain on securities transactions	$ (197)	$ (11)
Income tax expense	16,226	5,257
Total reclassification	(48,559)	(14,931)
Compensation and employee benefits	35,312	31,195
Unrealized Gains (Losses) on Available for Sale Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain on securities transactions	230	0
Income tax expense	(59)	0
Total reclassification	171	0
Reclassification adjustment | Post-retirement obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense	41	(28)
Total reclassification	(109)	84
Compensation and employee benefits	$ (150)	$ 112

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)counterpartyinstrument	Dec. 31, 2020USD ($)instrument
Derivative [Line Items]
Derivative instruments in accumulated other comprehensive income reclassified to interest expense	$ 3,500
Derivative liability, notional amount	$ 600,000
Number of counterparties | counterparty	4
Counterparty in liability position | counterparty	4
Derivative liabilities	$ 38,500
Collateral against obligations	42,000
Derivatives Not Designated as a Hedging Instruments
Derivative [Line Items]
Credit derivatives, fair value	$ 96	$ 97
Derivatives Not Designated as a Hedging Instruments | Interest rate products
Derivative [Line Items]
Number of derivative instruments held (in instrument) | instrument	174	172
Derivative notional amount	$ 2,620,000	$ 2,630,000
Derivatives Not Designated as a Hedging Instruments | Credit contracts
Derivative [Line Items]
Number of derivative instruments held (in instrument) | instrument	13
Derivative notional amount	$ 131,400	$ 121,700
Amount of collateral	$ 650
Designated as Hedging Instrument
Derivative [Line Items]
Number of outstanding derivatives | instrument	14

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities (Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivatives Not Designated as a Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 74,764	$ 107,749
Liability derivatives	75,740	109,148
Derivatives Not Designated as a Hedging Instruments | Other Assets | Interest rate products
Derivatives, Fair Value [Line Items]
Asset derivatives	74,668	107,652
Derivatives Not Designated as a Hedging Instruments | Other Assets | Credit contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	96	97
Derivatives Not Designated as a Hedging Instruments | Other Liabilities | Interest rate products
Derivatives, Fair Value [Line Items]
Liability derivatives	75,740	109,148
Derivatives Not Designated as a Hedging Instruments | Other Liabilities | Credit contracts
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	1,778	(6,671)
Liability derivatives	2,488	0
Designated as Hedging Instrument | Other Assets | Interest rate products
Derivatives, Fair Value [Line Items]
Asset derivatives	1,778	(6,671)
Designated as Hedging Instrument | Other Liabilities | Interest rate products
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 2,488	$ 0

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivatives Not Designated as a Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	$ 423	$ (820)
Derivatives Not Designated as a Hedging Instruments | Interest rate products | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	400	(819)
Derivatives Not Designated as a Hedging Instruments | Credit contracts | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	23	(1)
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	879	106
Designated as Hedging Instrument | Interest rate products | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	$ 879	$ 106

Revenue Recognition (Summary of

Revenue Recognition (Summary of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Percentage of total revenue excluded from adoption of 606	82.30%	84.00%
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 14,136	$ 10,438
Total out-of-scope non-interest income	7,501	6,553
Total non-interest income	21,637	16,991
Wealth management fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,134	6,251
Insurance agency income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,727	0
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,497	2,977
Debit card and ATM fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,778	1,210
Total banking service charges and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 4,275	$ 4,187

Leases (Additional Information)

Leases (Additional Information) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets	$ 40,960	$ 41,142
Operating lease liabilities	$ 42,323	$ 42,042
Weighted-average remaining lease term	8 years 9 months 18 days
Weighted-average discount rate	3.14%

Leases (Supplemental Balance Sh

Leases (Supplemental Balance Sheet Information) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets	$ 40,960	$ 41,142
Operating lease liabilities	$ 42,323	$ 42,042
Operating lease, right-of-use asset, statement of financial position [Extensible List]	Other assets	Other assets
Operating lease, liability, statement of financial position [Extensible List]	Other liabilities	Other liabilities

Leases (Supplemental Cash Flow

Leases (Supplemental Cash Flow and Lease Cost Information) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flow, Operating Activities, Lessee [Abstract]
Operating lease cost	$ 2,812	$ 2,130
Variable lease cost	803	607
Total Lease Cost	3,615	2,737
Operating cash flows from operating leases	$ 2,345	$ 2,125

Leases (Future Minimum Payments

Leases (Future Minimum Payments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Remainder of 2021	$ 6,472
2022	6,391
2023	5,878
2024	5,475
2025	4,887
Thereafter	20,027
Total future minimum lease payments	49,130
Amounts representing interest	6,807
Present value of net future minimum lease payments	$ 42,323	$ 42,042