Provident Financial Services (PFS) 10-Q 9 Nov 20 2020 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Nov. 06, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	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		78,572,138
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001178970
Current Fiscal Year End Date	--12-31

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 382,014	$ 131,555
Short-term investments	128,124	55,193
Total cash and cash equivalents	510,138	186,748
Available for sale debt securities, at fair value	1,100,391	976,919
Held to maturity debt securities	446,591	453,629
Equity securities, at fair value	869	825
Federal Home Loan Bank stock	69,975	57,298
Loans	9,756,809	7,332,885
Less allowance for credit losses	106,314	55,525
Net loans	9,650,495	7,277,360
Foreclosed assets, net	4,720	2,715
Banking premises and equipment, net	72,909	55,210
Accrued interest receivable	43,967	29,031
Intangible assets	467,128	437,019
Bank-owned life insurance	234,410	195,533
Other assets	269,729	136,291
Total assets	12,871,322	9,808,578
Deposits:
Demand deposits	7,104,322	5,384,868
Savings deposits	1,310,231	983,714
Certificates of deposit of $100,000 or more	627,041	438,551
Other time deposits	517,647	295,476
Total deposits	9,559,241	7,102,609
Mortgage escrow deposits	27,510	26,804
Borrowed funds	1,413,029	1,125,146
Subordinated debentures	25,099	0
Other liabilities	244,874	140,179
Total liabilities	11,269,753	8,394,738
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, 83,209,293 shares issued and 78,481,159 shares outstanding at September 30, 2020 and 65,787,900 outstanding at December 31, 2019	832	832
Additional paid-in capital	960,863	1,007,303
Retained earnings	694,240	695,273
Accumulated other comprehensive income	13,331	3,821
Treasury stock	(45,118)	(268,504)
Unallocated common stock held by the Employee Stock Ownership Plan	(22,579)	(24,885)
Common stock acquired by deferred compensation plans	(4,666)	(3,833)
Deferred compensation plans	4,666	3,833
Total stockholders’ equity	1,601,569	1,413,840
Total liabilities and stockholders’ equity	$ 12,871,322	$ 9,808,578

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Held to maturity debt securities	$ 467,693	$ 467,966
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
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)	83,209,293	83,209,293
Common stock, shares outstanding (in shares)	78,481,159	65,787,900

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income:
Real estate secured loans	$ 58,897	$ 56,402	$ 162,635	$ 167,051
Commercial loans	20,622	20,104	58,238	63,788
Consumer loans	4,305	4,648	12,024	14,216
Available for sale debt securities, equity securities and Federal Home Loan Bank stock	6,321	7,918	19,669	24,584
Held to maturity debt securities	2,836	3,075	8,661	9,408
Deposits, Federal funds sold and other short-term investments	472	879	1,932	2,038
Total interest income	93,453	93,026	263,159	281,085
Interest expense:
Deposits	7,400	11,730	26,000	33,940
Borrowed funds	3,862	7,768	13,120	22,055
Subordinated debt	206	0	206	0
Total interest expense	11,468	19,498	39,326	55,995
Net interest income	81,985	73,528	223,833	225,090
Provision for credit losses	6,400	500	32,017	10,200
Net interest income after provision for credit losses	75,585	73,028	191,816	214,890
Non-interest income:
Fees	5,736	7,634	17,179	20,617
Wealth management income	6,847	6,084	19,075	16,406
Insurance agency income	1,711	0	1,711	0
Bank-owned life insurance	1,644	1,272	4,290	4,253
Net gains on securities transactions	0	0	55	29
Other income	4,688	3,057	9,672	4,764
Total non-interest income	20,626	18,047	51,982	46,069
Non-interest expense:
Compensation and employee benefits	35,700	29,376	96,095	86,735
Net occupancy expense	6,993	6,413	19,362	19,629
Data processing expense	5,026	4,114	14,439	12,447
FDIC insurance	1,185	0	1,953	1,167
Amortization of intangibles	918	827	2,373	2,161
Advertising and promotion expense	773	1,098	2,774	3,059
Credit loss (benefit) expense for off-balance sheet credit exposures	(575)	0	5,714	0
Other operating expenses	9,763	7,910	26,447	22,650
Total non-interest expense	59,783	49,738	169,157	147,848
Income before income tax expense	36,428	41,337	74,641	113,111
Income tax expense	9,285	9,938	18,257	26,429
Net income	$ 27,143	$ 31,399	$ 56,384	$ 86,682
Basic earnings per share (usd per share)	$ 0.37	$ 0.49	$ 0.84	$ 1.34
Weighted average basic shares outstanding (in shares)	72,519,123	64,511,956	67,093,442	64,720,642
Diluted earnings per share (usd per share)	$ 0.37	$ 0.49	$ 0.84	$ 1.34
Weighted average diluted shares outstanding (in shares)	72,604,298	64,632,285	67,173,876	64,852,983

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 27,143	$ 31,399	$ 56,384	$ 86,682
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	(428)	2,614	15,388	19,854
Reclassification adjustment for gains included in net income	0	0	0	0
Total	(428)	2,614	15,388	19,854
Unrealized gains (losses) on derivatives	880	137	(6,117)	(813)
Amortization related to post-retirement obligations	85	35	239	57
Total other comprehensive income	537	2,786	9,510	19,098
Total comprehensive income	$ 27,680	$ 34,185	$ 65,894	$ 105,780

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	RETAINED EARNINGSCumulative Effect, Period of Adoption, Adjustment	ACCUMULATED OTHER COMPREHENSIVE INCOME	TREASURYSTOCK	UNALLOCATED ESOP SHARES	COMMON STOCK ACQUIRED BY DEFERRED COMP PLANS	DEFERRED COMPENSATION PLANS
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of Adopting Accounting Standards Updates	$ 1,358,980	$ 4,350	$ 832	$ 1,021,533	$ 651,099	$ 4,350	$ (12,336)	$ (272,470)	$ (29,678)	$ (4,504)	$ 4,504
Beginning balance at Dec. 31, 2018	1,358,980	4,350	832	1,021,533	651,099	4,350	(12,336)	(272,470)	(29,678)	(4,504)	4,504
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	86,682				86,682
Other comprehensive income (loss), net of tax	19,098						19,098
Cash dividends paid	(59,591)				(59,591)
Distributions from DDFP	123			123						503	(503)
Purchases of treasury stock	(19,867)							(19,867)
Purchase of employee restricted shares to fund statutory tax withholding	(1,985)							(1,985)
Shares issued dividend reinvestment plan	1,764			545				1,219
Stock option exercises	139			(96)				235
Allocation of ESOP shares	3,121			1,007					2,114
Allocation of SAP shares	4,884			4,884
Allocation of stock options	135			135
Effect of Adopting Accounting Standards Updates	1,358,980	4,350	832	1,021,533	651,099	4,350	6,762	(272,470)	(27,564)	(4,504)	4,504
Ending Balance at Sep. 30, 2019	1,397,833		832	1,028,131	682,540		6,762	(292,868)	(27,564)	(4,001)	4,001
Beginning balance at Dec. 31, 2018	1,358,980	4,350	832	1,021,533	651,099	4,350	(12,336)	(272,470)	(29,678)	(4,504)	4,504
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of Adopting Accounting Standards Updates	1,358,980	(8,311)	832	1,007,303	695,273	(8,311)	3,821	(268,504)	(24,885)	(3,833)	3,833
Ending Balance at Dec. 31, 2019	$ 1,413,840	(8,311)	832	1,007,303	695,273	(8,311)	3,821	(268,504)	(24,885)	(3,833)	3,833
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting standards update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Effect of Adopting Accounting Standards Updates	$ 1,391,446		832	1,025,855	666,415		3,976	(277,364)	(28,268)	(4,169)	4,169
Beginning balance at Jun. 30, 2019	1,391,446		832	1,025,855	666,415		3,976	(277,364)	(28,268)	(4,169)	4,169
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,399				31,399
Other comprehensive income (loss), net of tax	2,786						2,786
Cash dividends paid	(15,274)				(15,274)
Distributions from DDFP	38			38						168	(168)
Purchases of treasury stock	(15,817)							(15,817)
Purchase of employee restricted shares to fund statutory tax withholding	(32)							(32)
Shares issued dividend reinvestment plan	461			116				345
Allocation of ESOP shares	1,002			298					704
Allocation of SAP shares	1,778			1,778
Allocation of stock options	46			46
Effect of Adopting Accounting Standards Updates	1,397,833		832	1,028,131	682,540		6,762	(292,868)	(27,564)	(4,001)	4,001
Ending Balance at Sep. 30, 2019	1,397,833		832	1,028,131	682,540		6,762	(292,868)	(27,564)	(4,001)	4,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of Adopting Accounting Standards Updates	1,397,833		832	1,028,131	682,540		6,762	(292,868)	(27,564)	(4,001)	4,001
Effect of Adopting Accounting Standards Updates	1,413,840	(8,311)	832	1,007,303	695,273	(8,311)	3,821	(268,504)	(24,885)	(3,833)	3,833
Beginning balance at Dec. 31, 2019	1,413,840	(8,311)	832	1,007,303	695,273	(8,311)	3,821	(268,504)	(24,885)	(3,833)	3,833
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56,384				56,384
Other comprehensive income (loss), net of tax	9,510						9,510
Cash dividends paid	(49,106)				(49,106)
Acquisition of deferred compensation plan										(1,336)	1,336
Distributions from DDFP	68			68						503	(503)
Purchases of treasury stock	(7,256)							(7,256)
Purchase of employee restricted shares to fund statutory tax withholding	(974)							(974)
Shares issued dividend reinvestment plan	451			50				401
Allocation of ESOP shares	2,127			(179)					2,306
Allocation of SAP shares	3,866			3,866
Allocation of stock options	142			142
Treasury shares issued due to acquisition	180,828			(50,387)				231,215
Effect of Adopting Accounting Standards Updates	1,413,840	$ (8,311)	832	960,863	694,240	$ (8,311)	13,331	(268,504)	(24,885)	(3,833)	4,666
Ending Balance at Sep. 30, 2020	1,601,569		832	960,863	694,240		13,331	(45,118)	(22,579)	(4,666)	4,666
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of Adopting Accounting Standards Updates	1,410,407		832	1,009,978	685,509		12,794	(275,359)	(23,347)	(3,498)	3,498
Beginning balance at Jun. 30, 2020	1,410,407		832	1,009,978	685,509		12,794	(275,359)	(23,347)	(3,498)	3,498
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,143				27,143
Other comprehensive income (loss), net of tax	537						537
Cash dividends paid	(18,412)				(18,412)
Acquisition of deferred compensation plan										(1,336)	1,336
Distributions from DDFP	16			16						168	(168)
Purchases of treasury stock	(961)							(961)
Purchase of employee restricted shares to fund statutory tax withholding	(13)							(13)
Allocation of ESOP shares	605			(163)					768
Allocation of SAP shares	1,371			1,371
Allocation of stock options	48			48
Treasury shares issued due to acquisition	180,828			(50,387)				231,215
Effect of Adopting Accounting Standards Updates	1,410,407		832	960,863	694,240		13,331	(45,118)	(22,579)	(4,666)	4,666
Ending Balance at Sep. 30, 2020	$ 1,601,569		832	960,863	694,240		13,331	(45,118)	(22,579)	(4,666)	4,666
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting standards update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Effect of Adopting Accounting Standards Updates	$ 1,601,569		$ 832	$ 960,863	$ 694,240		$ 13,331	$ (45,118)	$ (22,579)	$ (4,666)	$ 4,666

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 56,384	$ 86,682
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	7,799	7,962
Provision for credit losses	32,017	10,200
Provision for credit loss for off-balance sheet credit exposure	5,714	0
Deferred tax benefit	(7,531)	(112)
Amortization of operating lease right-of-use assets	6,565	6,303
Income on Bank-owned life insurance	(4,290)	(4,253)
Net amortization of premiums and discounts on securities	6,881	5,619
Accretion of net deferred loan fees	(6,079)	(3,872)
Amortization of premiums on purchased loans, net	779	584
Net increase in loans originated for sale	(13,559)	(14,414)
Proceeds from sales of loans originated for sale	14,347	15,235
Proceeds from sales and paydowns of foreclosed assets	3,491	1,063
ESOP expense	2,127	3,121
Allocation of stock award shares	3,866	4,884
Allocation of stock options	142	135
Net gain on sale of loans	(788)	(821)
Net gain on securities transactions	(55)	(29)
Net gain on sale of premises and equipment	(806)	0
Net gain on sale of foreclosed assets	(859)	(182)
Decrease in accrued interest receivable	5,989	2,384
Increase in other assets	(145,561)	(50,146)
Increase in other liabilities	78,047	38,291
Net cash provided by operating activities	44,620	108,634
Cash flows from investing activities:
Proceeds from maturities, calls and paydowns of held to maturity debt securities	49,422	30,789
Purchases of held to maturity debt securities	(31,686)	(15,976)
Proceeds from sales of securities	13,905	0
Proceeds from maturities and paydowns of available for sale debt securities	247,660	151,632
Purchases of available for sale debt securities	(137,879)	(116,972)
Proceeds from redemption of Federal Home Loan Bank stock	88,909	125,894
Purchases of Federal Home Loan Bank stock	(90,370)	(125,802)
Cash received, net of cash consideration paid for acquisition	78,089	(15,022)
BOLI claim benefits received	6,527	1,891
Net increase in loans	(668,612)	(13,967)
Proceeds from sales of premises and equipment	806	0
Purchases of premises and equipment	(6,977)	(2,796)
Net cash (used in) provided by investing activities	(450,206)	19,671
Cash flows from financing activities:
Net increase in deposits	698,854	131,249
Increase in mortgage escrow deposits	706	404
Cash dividends paid to stockholders	(49,106)	(59,591)
Shares issued dividend reinvestment plan	451	1,764
Purchase of treasury stock	(7,256)	(19,867)
Purchase of employee restricted shares to fund statutory tax withholding	(974)	(1,985)
Stock options exercised	0	139
Proceeds from long-term borrowings	1,810,999	1,009,000
Payments on long-term borrowings	(1,649,915)	(891,955)
Net decrease in short-term borrowings	(74,783)	(179,264)
Net cash provided by (used in) financing activities	728,976	(10,106)
Net increase in cash and cash equivalents	323,390	118,199
Cash and cash equivalents at beginning of period	186,748	142,661
Cash and cash equivalents at end of period	510,138	260,860
Cash paid during the period for:
Interest on deposits and borrowings	37,506	55,474
Income taxes	22,534	21,137
Non-cash investing activities:
Initial recognition of operating lease right-of-use assets	0	44,946
Initial recognition of operating lease liabilities	0	46,050
Transfer of loans receivable to foreclosed assets	2,516	850
Non-cash assets acquired at fair value:
Investment securities	255,242	0
Loans, net	1,752,529	0
Bank-owned life insurance	37,237	0
Goodwill and other intangible assets	32,404	21,562
Bank premises and equipment	16,620	0
Other assets	19,786	71
Total non-cash assets acquired at fair value	2,113,818	$ 21,633
Liabilities assumed
Deposits	1,757,777
Borrowings and subordinated debt	226,656
Other Liabilities	26,648
Total liabilities assumed	$ 2,011,081
Common stock issued for acquisitions	180,828,000

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2020
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. These interim financial statements include the assets and liabilities acquired from SB One on July 31, 2020, and include two months of results of operations related to the acquisition of SB One for the three and nine months ended September 30, 2020. The results of operations for the three and nine months ended September 30, 2020 are not necessarily indicative of the results of operations that may be expected for all of 2020. 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, 2019 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 and nine months ended September 30, 2020 and 2019 (dollars in thousands, except per share amounts): Three months ended September 30, 2020 2019 Net Weighted Per Net Weighted Per Net income $ 27,143 $ 31,399 Basic earnings per share: Income available to common stockholders $ 27,143 72,519,123 $ 0.37 $ 31,399 64,511,956 $ 0.49 Dilutive shares 85,175 120,329 Diluted earnings per share: Income available to common stockholders $ 27,143 72,604,298 $ 0.37 $ 31,399 64,632,285 $ 0.49 Nine months ended September 30, 2020 2019 Net Weighted Per Net Weighted Per Net income $ 56,384 $ 86,682 Basic earnings per share: Income available to common stockholders $ 56,384 67,093,442 $ 0.84 $ 86,682 64,720,642 $ 1.34 Dilutive shares 80,434 132,341 Diluted earnings per share: Income available to common stockholders $ 56,384 67,173,876 $ 0.84 $ 86,682 64,852,983 $ 1.34 Anti-dilutive stock options and awards at September 30, 2020 and 2019, totaling 1.1 million shares and 678,583 shares, respectively, were excluded from the earnings per share calculations. C. Loans Receivable and Allowance for Credit Losses

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2020
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. The Company expects to close three of the acquired banking offices in the fourth quarter of 2020. As part of the acquisition, the addition of SB One Insurance Agency allows 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 outanding 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 purchase price has been allocated to the respective assets acquired and liabilities assumed based upon their estimated fair values, net of tax. 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 following table summarizes the estimated fair values of the assets acquired and the liabilities assumed at the date of acquisition from SB One, net of cash consideration paid (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 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. 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 loan and lease 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 had a gross amortized cost basis of $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 $10.6 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 are 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 forecasts inclusive of the impact of the COVID-19 pandemic 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. 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 $ 1,784,945 Interest rate fair value adjustment on all loans 2,567 Credit fair value adjustment on non-PCD loans (21,397) Allowance for credit losses on PCD loans (13,586) Fair value of acquired loans 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, 8 of which were owned premises. The Company expects to close three of the acquired banking offices in the fourth quarter of 2020. The fair value of SB One’s premises was determined based upon independent third-party appraisals performed by licensed appraisers in the market in which the premises are located. 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 the 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. 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. Merger-Related Expenses Merger-related expenses, which are recorded in other operating expenses on the Consolidated Statements of Income, totaled $2.0 and $3.1 million for the three and nine months ended September 30, 2020, respectively, and primarily consist of consulting and legal expenses. Acquisition of Tirschwell & Loewy, Inc. On April 1, 2019, Beacon Trust Company ("Beacon") completed its acquisition of certain assets of Tirschwell & Loewy, Inc. ("T&L"), a New York City-based independent registered investment adviser. Beacon is a wholly owned subsidiary of Provident Bank. This acquisition expanded the Company’s wealth management business by $822.4 million of assets under management at the time of acquisition. The acquisition was accounted for under the acquisition method of accounting. The Company recorded goodwill of $8.2 million, a customer relationship intangible of $12.6 million and $800,000 of other identifiable intangibles related to the acquisition. In addition, the Company recorded a contingent consideration liability at its fair value of $6.6 million. The contingent consideration arrangement requires the Company to pay additional cash consideration to T&L's former stakeholders over a three In the fourth quarter of 2019, the Company recognized a $2.8 million increase in the estimated fair value of the contingent consideration liability. While performance of the acquired business has been adversely impacted for both the three and nine months ended September 30, 2020 due to worsening economic conditions and declining asset valuations attributable to the

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities At September 30, 2020, the Company had $1.10 billion and $446.6 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 September 30, 2020 totaled 68, compared with 85 at December 31, 2019. 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 September 30, 2020 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 September 30, 2020 and December 31, 2019 (in thousands): September 30, 2020 Amortized Gross Gross Fair Agency obligations $ 1,081 4 (1) 1,084 Mortgage-backed securities 903,628 31,407 (864) 934,171 Asset-backed securities 53,018 877 (27) 53,868 State and municipal obligations 69,931 918 (331) 70,518 Corporate obligations 40,216 589 (55) 40,750 $ 1,067,874 33,795 (1,278) 1,100,391 December 31, 2019 Amortized Gross Gross Fair Mortgage-backed securities $ 936,196 12,367 (1,133) 947,430 State and municipal obligations 3,907 172 — 4,079 Corporate obligations 25,032 393 (15) 25,410 $ 965,135 12,932 (1,148) 976,919 The amortized cost and fair value of available for sale debt securities at September 30, 2020, 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. September 30, 2020 Amortized Fair Due in one year or less $ — — Due after one year through five years 5,679 5,792 Due after five years through ten years 38,089 38,737 Due after ten years 66,379 66,739 $ 110,147 111,268 Investments which pay principal on a periodic basis totaling $957.7 million at amortized cost and $989.1 million 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 and nine months ended September 30, 2020 and 2019, proceeds from calls on securities in the available for sale debt securities portfolio totaled $13.9 million, with no gain or loss recognized. The following tables present the fair values and gross unrealized losses for available for sale debt securities in an unrealized loss position at September 30, 2020 and December 31, 2019 (in thousands): September 30, 2020 Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 478 (1) — — 478 (1) Mortgage-backed securities 84,276 (835) 8,489 (29) 92,765 (864) Asset-backed securities 7,624 (27) — — 7,624 (27) State and municipal obligations 34,033 (331) — — 34,033 (331) Corporate obligations 6,938 (11) 1,981 (44) 8,919 (55) $ 133,349 (1,205) 10,470 (73) 143,819 (1,278) December 31, 2019 Less than 12 months 12 months or longer Total Fair value Gross Fair value Gross Fair Gross Mortgage-backed securities $ 136,270 (629) 46,819 (504) 183,089 (1,133) Corporate obligations 2,013 (15) — — 2,013 (15) $ 138,283 (644) 46,819 (504) 185,102 (1,148) The number of available for sale debt securities in an unrealized loss position at September 30, 2020 totaled 55, compared with 50 at December 31, 2019. The increase in the number of securities in an unrealized loss position at September 30, 2020 was due to available for sale debt securities that were brought over from the SB One acquisition. At September 30, 2020, there was one private label mortgage-backed security in an unrealized loss position, with an amortized cost of $17,000 and an unrealized loss of $2,000. 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 September 30, 2020 and December 31, 2019 (in thousands): September 30, 2020 Amortized Gross Gross Allowance for credit losses Fair Agency obligations $ 9,100 4 (16) — 9,088 Mortgage-backed securities 75 2 — — 77 State and municipal obligations 428,532 21,018 (35) (67) 449,448 Corporate obligations 8,960 133 (4) (9) 9,080 $ 446,667 21,157 (55) (76) 467,693 At September 30, 2020, total amortized cost, net of allowance for credit losses totaled $446.6 million. December 31, 2019 Amortized Gross Gross Allowance for credit losses Fair Agency obligations $ 6,599 11 (9) — 6,601 Mortgage-backed securities 118 4 — — 122 State and municipal obligations 437,074 14,394 (115) — 451,353 Corporate obligations 9,838 58 (6) — 9,890 $ 453,629 14,467 (130) — 467,966 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 and nine months ended September 30, 2020 and 2019. For the three and nine months ended September 30, 2020, proceeds from calls on securities in the held to maturity debt securities portfolio totaled $13.7 million and $39.5 million, respectively. As to these calls of securities, for the three months ended September 30, 2020, there were no gross gains and no gross losses. For the nine months ended September 30, 2020, there were gross gains of $55,000 and no gross losses. For the three and nine months ended September 30, 2019, proceeds from calls of securities in the held to maturity debt securities portfolio totaled $14.4 million and $26.6 million, respectively. As to these calls of securities, there were no of gross gains and no gross losses for the three and nine months ended September 30, 2019. The amortized cost and fair value of investment securities in the held to maturity debt securities portfolio at September 30, 2020 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. September 30, 2020 Amortized Fair Due in one year or less $ 22,685 22,792 Due after one year through five years 130,032 134,202 Due after five years through ten years 221,305 234,041 Due after ten years 72,569 76,658 $ 446,591 467,693 Mortgage-backed securities totaling $75,000 at amortized cost and $77,000 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 $76,000 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 September 30, 2020 and December 31, 2019 (in thousands): September 30, 2020 Unrealized Losses Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 3,985 (16) — — 3,985 (16) State and municipal obligations 3,552 (18) 406 (17) 3,958 (35) Corporate obligations 1,577 (4) — — 1,577 (4) $ 9,114 (38) 406 (17) 9,520 (55) December 31, 2019 Unrealized Losses Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 3,601 (9) — — 3,601 (9) State and municipal obligations 7,675 (42) 2,093 (73) 9,768 (115) Corporate obligations 3,254 (6) — — 3,254 (6) $ 14,530 (57) 2,093 (73) 16,623 (130) The number of held to maturity debt securities in an unrealized loss position at September 30, 2020 totaled 13, compared with 35 at December 31, 2019. The decrease in the number of securities in an unrealized loss position at September 30, 2020, was due to lower current market interest rates compared to prevailing market rates at December 31, 2019. Credit Quality Indicators. The following table provides the amortized cost of held to maturity debt securities by credit rating as of September 30, 2020 (in thousands): September 30, 2020 Total Portfolio AAA AA A BBB Not Rated Total Agency obligations $ 9,100 — — — — 9,100 Mortgage-backed securities 75 — — — — 75 State and municipal obligations 50,128 313,053 54,217 1,115 10,019 428,532 Corporate obligations — 2,719 5,816 400 25 8,960 $ 59,303 315,772 60,033 1,515 10,044 446,667 December 31, 2019 Total Portfolio AAA AA A BBB Not Rated Total Agency obligations $ 6,599 — — — — 6,599 Mortgage-backed securities 118 — — — — 118 State and municipal obligations 49,316 330,322 56,317 1,119 — 437,074 Corporate obligations — 3,128 6,335 350 25 9,838 $ 56,033 333,450 62,652 1,469 25 453,629 Credit quality indicators are metrics that provide information regarding the relative credit risk of debt securities. At September 30, 2020, the held to maturity debt securities portfolio was comprised of 13% rated AAA, 71% 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. At September 30, 2020, the allowance for credit losses on held to maturity debt securities was $76,000, an increase from $70,000 at January 1, 2020, when the Company adopted CECL.

Loans Receivable and Allowance

Loans Receivable and Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2020
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 September 30, 2020 and December 31, 2019 are summarized as follows (in thousands): September 30, 2020 December 31, 2019 Mortgage loans: Residential $ 1,320,222 1,077,689 Commercial 3,750,639 2,578,393 Multi-family 1,544,924 1,225,551 Construction 462,161 429,812 Total mortgage loans 7,077,946 5,311,445 Commercial loans Commercial owner occupied 934,104 853,269 Commercial non-owner occupied 906,355 732,277 Other commercial loans 449,737 49,213 Total commercial loans 2,290,196 1,634,759 Consumer loans 406,451 391,360 Total gross loans 9,774,593 7,337,564 PCI loans prior to CECL — 746 Premiums on purchased loans 1,514 2,474 Unearned discounts (26) (26) Net deferred fees (19,272) (7,873) Total loans $ 9,756,809 7,332,885 The following tables summarize the aging of loans receivable by portfolio segment and class of loans (in thousands). The September 30, 2020 balances include PCD loans, while the December 31, 2019 balances exclude PCI loans (in accordance with ASC 310, prior to the adoption of ASU 2016-13 on January 1, 2020): September 30, 2020 30-59 Days 60-89 Days Non-accrual Recorded Total Past Current Total Loans Non-accrual loans with no related allowance Mortgage loans: Residential $ 8,719 7,215 9,424 — 25,358 1,294,864 1,320,222 1,491 Commercial 3,914 4,629 16,568 — 25,111 3,725,528 3,750,639 4,134 Multi-family — 488 — — 488 1,544,436 1,544,924 — Construction 7,396 918 151 — 8,465 453,696 462,161 — Total mortgage loans 20,029 13,250 26,143 — 59,422 7,018,524 7,077,946 5,625 Commercial loans 5,575 949 21,269 — 27,793 2,262,403 2,290,196 6,060 Consumer loans 745 862 1,541 — 3,148 403,303 406,451 9 Total gross loans $ 26,349 15,061 48,953 — 90,363 9,684,230 9,774,593 11,694 December 31, 2019 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 $ 5,905 2,579 8,543 — 17,027 1,060,662 1,077,689 2,989 Commercial — — 5,270 — 5,270 2,573,123 2,578,393 — Multi-family — — — — — 1,225,551 1,225,551 — Construction — — — — — 429,812 429,812 — Total mortgage loans 5,905 2,579 13,813 — 22,297 5,289,148 5,311,445 2,989 Commercial loans 2,383 95 25,160 — 27,638 1,607,121 1,634,759 3,238 Consumer loans 1,276 337 1,221 — 2,834 388,526 391,360 569 Total gross loans $ 9,564 3,011 40,194 — 52,769 7,284,795 7,337,564 6,796 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 $49.0 million and $40.2 million at September 30, 2020 and December 31, 2019, respectively. Included in non-accrual loans were $4.9 million and $13.1 million of loans which were less than 90 days past due at September 30, 2020 and December 31, 2019, respectively. There were no loans 90 days or greater past due and still accruing interest at September 30, 2020 or December 31, 2019. 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 collateral’s fair value 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. The Company believes there have been no significant time lapses resulting from this process. At September 30, 2020, there were 151 impaired loans totaling $65.8 million. Included in this total were 122 TDRs related to 119 borrowers totaling $38.0 million that were performing in accordance with their restructured terms and which continued to accrue interest at September 30, 2020. At December 31, 2019, there were 158 impaired loans totaling $70.6 million, of which 147 loans totaling $48.3 million were TDRs. Included in this total were 133 TDRs to 128 borrowers totaling $42.7 million that were performing in accordance with their restructured terms and which continued to accrue interest at December 31, 2019. At September 30, 2020 and December 31, 2019, the Company had $18.0 million and $20.4 million of collateral-dependent impaired loans, respectively. The collateral-dependent impaired loans at September 30, 2020 consisted of $13.2 million in commercial loans, $4.7 million in residential real estate loans, and $9,000 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 and nine months ended September 30, 2020 and 2019 was as follows (in thousands): Three months ended September 30, Mortgage loans Commercial loans Consumer loans Total 2020 Balance at beginning of period $ 54,871 25,284 6,104 86,259 Provision charged to operations 2,922 2,767 722 6,411 Initial allowance on credit loans related to PCD loans 11,984 1,582 20 13,586 Recoveries of loans previously charged-off 35 679 144 858 Loans charged-off (22) (727) (51) (800) Balance at end of period $ 69,790 29,585 6,939 106,314 2019 Balance at beginning of period $ 27,280 33,549 1,981 62,810 Provision charged to operations (2,092) 2,880 (288) 500 Recoveries of loans previously charged-off 24 126 343 493 Loans charged-off (131) (6,212) (116) (6,459) Balance at end of period $ 25,081 30,343 1,920 57,344 Nine months ended September 30, Mortgage loans Commercial loans Consumer loans Total 2020 Balance at beginning of period $ 25,511 28,263 1,751 55,525 Increase (decrease) due to the initial adoption of CECL - Retained earnings 14,188 (9,974) 3,706 7,920 Initial allowance on credit loans related to PCD loans 11,984 1,582 20 13,586 Provision charged to operations 17,987 12,672 1,352 32,011 Recoveries of loans previously charged-off 143 1,597 370 2,110 Loans charged-off (23) (4,555) (260) (4,838) Balance at end of period $ 69,790 29,585 6,939 106,314 2019 Balance at beginning of period $ 27,678 25,693 2,191 55,562 Provision (credited) charged to operations (2,814) 13,337 (323) 10,200 Recoveries of loans previously charged-off 361 291 596 1,248 Loans charged-off (144) (8,978) (544) (9,666) Balance at end of period $ 25,081 30,343 1,920 57,344 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 and nine months ended September 30, 2020, the Company recorded a $6.4 million and $32.0 million provision for credit losses on loans, respectively. The increase in the provision for credit losses for the three and nine months ended September 30, 2020 reflects management’s best estimate of projected losses over the life of loans in our portfolio in accordance with the CECL approach, given the economic outlook and forecasts related to the COVID-19 pandemic, as well as the impact of unprecedented fiscal, monetary and regulatory interventions. The largest increase in the provision for credit losses on loans for the three and nine months ended September 30, 2020 was in the commercial real estate portfolio. The following table illustrates the impact of the January 1, 2020 adoption of CECL on the allowance for credits for the loan portfolio (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Loans Residential $ 8,950 3,411 5,539 Commercial 17,118 12,885 4,233 Multi-family 9,519 3,370 6,149 Construction 4,152 5,885 (1,733) Total mortgage loans 39,739 25,551 14,188 Commercial loans 18,254 28,228 (9,974) Consumer loans 5,452 1,746 3,706 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): September 30, 2020 Mortgage Commercial Consumer Total Portfolio Individually evaluated for impairment $ 43,397 20,963 1,449 65,809 Collectively evaluated for impairment 7,034,549 2,269,233 405,002 9,708,784 Total gross loans $ 7,077,946 2,290,196 406,451 9,774,593 December 31, 2019 Mortgage Commercial Consumer Total Portfolio Individually evaluated for impairment $ 39,910 28,357 2,374 70,641 Collectively evaluated for impairment 5,271,535 1,606,402 388,986 7,266,923 Total gross loans $ 5,311,445 1,634,759 391,360 7,337,564 The allowance for credit losses is summarized by portfolio segment and impairment classification as follows (in thousands): September 30, 2020 Mortgage Commercial loans Consumer loans Total Individually evaluated for impairment $ 1,391 1,876 33 3,300 Collectively evaluated for impairment 68,399 27,709 6,906 103,014 Total gross loans $ 69,790 29,585 6,939 106,314 December 31, 2019 Mortgage Commercial loans Consumer Total Individually evaluated for impairment $ 1,580 3,462 25 5,067 Collectively evaluated for impairment 23,931 24,801 1,726 50,458 Total gross loans $ 25,511 28,263 1,751 55,525 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 and nine months ended September 30, 2020 and 2019, along with their balances immediately prior to the modification date and post-modification as of September 30, 2020 and 2019 (in thousands): For the three months ended September 30, 2020 September 30, 2019 Troubled Debt Restructurings Number of Pre-Modification Post-Modification Number of Pre-Modification Post-Modification ($ in thousands) Mortgage loans: Residential 1 $ 91 $ 79 — $ — $ — Total mortgage loans 1 91 79 — — — Commercial loans 1 1,399 1,399 — — — Consumer loans — — — 1 20 16 Total restructured loans 2 $ 1,490 $ 1,478 1 $ 20 $ 16 For the nine months ended September 30, 2020 September 30, 2019 Troubled Debt Restructurings Number of Pre-Modification Post-Modification Number of Pre-Modification Post-Modification ($ in thousands) Mortgage loans: Residential 2 $ 434 $ 360 2 $ 749 $ 716 Commercial — — — 1 14,010 14,010 Total mortgage loans 2 434 360 3 14,759 14,726 Commercial loans 5 2,882 2,791 7 2,707 1,878 Consumer loans — — — 1 20 16 Total restructured loans 7 $ 3,316 $ 3,151 11 $ 17,486 $ 16,620 All TDRs are impaired loans, which are individually evaluated for impairment. During the three and nine months ended September 30, 2020, $612,000 and $3.8 million of charge-offs were recorded on collateral-dependent impaired loans. During the three and nine months ended September 30, 2019, $5.7 million and $7.7 million of charge-offs were recorded on collateral-dependent impaired loans, respectively. For the nine months ended September 30, 2020, the allowance for credit losses associated with the TDRs presented in the preceding tables totaled $421,000, while there was no allowance associated with TDRs for the three months ended September 30, 2020, and was included in the allowance for credit losses for loans individually evaluated for impairment. (See page 26 for further discussion related to COVID-19 loan modifications) For the three and nine months ended September 30, 2020, the TDRs presented in the preceding tables had a weighted average modified interest rate of 4.82% and 5.46%, respectively, compared to a weighted average rate of 4.83% and 5.51% prior to modification, for the three and nine months ended September 30, 2020, respectively. The following table presents loans modified as TDRs within the previous 12 months from September 30, 2020 and 2019, and for which there was a payment default (90 days or more past due) at the quarter ended September 30, 2020 and 2019. September 30, 2020 September 30, 2019 Troubled Debt Restructurings Subsequently Defaulted Number of Loans Outstanding Recorded Investment Number of Loans Outstanding Recorded ($ in thousands) Mortgage loans: Residential — $ — 1 $ 578 Total mortgage loans — — 1 578 Total restructured loans — $ — 1 $ 578 There were no loans which had a payment default (90 days or more past due) for loans modified as TDRs within the 12 month period ending September 30, 2020 . There was one payment default (90 days or more past due) to one borrower for loans modified as TDRs within the 12 month period ending September 30, 2019. For TDRs that subsequently default, the Company determines the amount of the allowance on that loan in accordance with the accounting policy for the allowance for credit losses on loans individually evaluated for impairment. As allowed by CECL, the Company elected to maintain pools of loans accounted for under ASC 310-30. At December 31, 2019, 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 purchased credit deteriorated ("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 as of 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) Allowance for credit losses on PCD loans (13,586) Net PCD loans $ 294,210 The following table presents loans individually evaluated for impairment by class and loan category, excluding PCD loans (in thousands): September 30, 2020 December 31, 2019 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 $ 14,144 11,541 — 11,694 386 13,478 10,739 — 10,910 533 Commercial 19,543 19,543 — 19,548 431 — — — — — Total 33,687 31,084 — 31,242 817 13,478 10,739 — 10,910 533 Commercial loans 7,959 5,713 — 7,300 29 3,927 3,696 — 4,015 17 Consumer loans 1,396 895 — 921 39 2,086 1,517 — 1,491 86 Total impaired loans $ 43,042 37,692 — 39,463 885 19,491 15,952 — 16,416 636 Loans with an allowance recorded Mortgage loans: Residential $ 7,922 7,503 728 7,440 235 10,860 10,326 829 10,454 428 Commercial 4,810 4,810 663 4,822 41 18,845 18,845 751 18,862 569 Total 12,732 12,313 1,391 12,262 276 29,705 29,171 1,580 29,316 997 Commercial loans 17,050 15,250 1,876 18,280 293 27,762 24,661 3,462 27,527 444 Consumer loans 569 554 33 560 13 868 857 25 878 46 Total impaired loans $ 30,351 28,117 3,300 31,102 582 58,335 54,689 5,067 57,721 1,487 Total impaired loans Mortgage loans: Residential $ 22,066 19,044 728 19,134 621 24,338 21,065 829 21,364 961 Commercial 24,353 24,353 663 24,370 472 18,845 18,845 751 18,862 569 Total 46,419 43,397 1,391 43,504 1,093 43,183 39,910 1,580 40,226 1,530 Commercial loans 25,009 20,963 1,876 25,580 322 31,689 28,357 3,462 31,542 461 Consumer loans 1,965 1,449 33 1,481 52 2,954 2,374 25 2,369 132 Total impaired loans $ 73,393 65,809 3,300 70,565 1,467 77,826 70,641 5,067 74,137 2,123 Specific allocations of the allowance for credit losses attributable to impaired loans totaled $3.3 million at September 30, 2020 and $5.1 million at December 31, 2019. At September 30, 2020 and December 31, 2019, impaired loans for which there was no related allowance for credit losses totaled $37.7 million and $16.0 million, respectively. The average balance of impaired loans for the nine months ended September 30, 2020 and December 31, 2019 was $70.6 million and $74.1 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 the COVID-19 pandemic 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 $310.8 million, or 3.2% of loans as of October 16, 2020. This $310.8 million of loans includes $47.5 million acquired from SB One and consists of $27.0 million in a first 90-day deferral period, $84.9 million in a second 90-day deferral period, and $198.9 million that have completed their initial deferral periods, but are expected to require ongoing assistance. Included in the $310.8 million of loans, $92.4 million are secured by hotels, $43.7 million are secured by retail properties, $31.4 million are secured by restaurants, $15.1 million are secured by suburban office space, and $42.7 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 troubled debt restructurings (“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 September 30, 2020, the Company secured 1,289 PPP loans for its customers totaling $474.8 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 September 30, 2020 Total portfolio Residential Commercial mortgage Multi-family Construction Total Commercial Consumer Total Loans (1) Special mention $ 4,483 54,368 101 872 59,824 168,833 362 229,019 Substandard 41,255 52,847 124 — 94,226 103,132 3,680 201,038 Doubtful — — — — — 76 — 76 Loss — — — — — — — — Total criticized and classified 45,738 107,215 225 872 154,050 272,041 4,042 430,133 Pass/Watch 1,274,484 3,643,424 1,544,699 461,289 6,923,896 2,018,155 402,409 9,344,460 Total $ 1,320,222 3,750,639 1,544,924 462,161 7,077,946 2,290,196 406,451 9,774,593 2020 Special mention $ — — — 872 872 657 — 1,529 Substandard 2,079 — — — 2,079 — 25 2,104 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 2,079 — — 872 2,951 657 25 3,633 Pass/Watch 198,722 375,324 230,034 28,187 832,267 586,510 27,605 1,446,382 Total gross loans $ 200,801 375,324 230,034 29,059 835,218 587,167 27,630 1,450,015 2019 Special mention $ 1,753 $ 12,434 $ — $ — $ 14,187 $ 6,755 $ — $ 20,942 Substandard 6,321 — — — 6,321 2,742 343 9,406 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 8,074 12,434 — — 20,508 9,497 343 30,348 Pass/Watch 139,391 547,969 139,633 164,333 991,326 225,447 46,745 1,263,518 Total gross loans $ 147,465 560,403 139,633 164,333 1,011,834 234,944 47,088 1,293,866 2018 Special mention $ 318 6,630 — — 6,948 10,908 — 17,856 Substandard 2,152 — — — 2,152 4,948 356 7,456 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 2,470 6,630 — — 9,100 15,856 356 25,312 Pass/Watch 79,552 361,309 171,555 119,980 732,396 169,974 40,927 943,297 Total gross loans $ 82,022 367,939 171,555 119,980 741,496 185,830 41,283 968,609 2017 Special mention $ — — — — — 31,465 — 31,465 Substandard 3,233 17,529 — — 20,762 8,040 15 28,817 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 3,233 17,529 — — 20,762 39,505 15 60,282 Pass/Watch 80,813 387,846 134,166 37,564 640,389 148,737 33,340 822,466 Total gross loans $ 84,046 405,375 134,166 37,564 661,151 188,242 33,355 882,748 2016 and prior Special mention $ 2,412 35,304 101 — 37,817 119,048 362 157,227 Substandard 27,470 35,318 124 — 62,912 87,402 2,941 153,255 Doubtful — — — — — 76 — 76 Loss — — — — — — — — Total criticized and classified 29,882 70,622 225 — 100,729 206,526 3,303 310,558 Pass/Watch 805,888 2,041,598 869,536 111,225 3,828,247 1,094,013 257,095 5,179,355 Total gross loans $ 835,770 2,112,220 869,761 111,225 3,928,976 1,300,539 260,398 5,489,913 At December 31, 2019 Residential Commercial mortgage Multi-family Construction Total Commercial Consumer Total loans Special mention $ 2,402 46,758 — — 49,160 79,248 286 128,694 Substandard 10,204 13,458 — 6,181 29,843 57,015 1,668 88,526 Doubtful — — — — — 836 — 836 Loss — — — — — — — — Total criticized and classified 12,606 60,216 — 6,181 79,003 137,099 1,954 218,056 Pass/Watch 1,065,083 2,518,177 1,225,551 423,631 5,232,442 1,497,660 389,406 7,119,508 Total $ 1,077,689 2,578,393 1,225,551 429,812 5,311,445 1,634,759 391,360 7,337,564 (1) Contained within criticized and classified loans at September 30, 2020 are loans that were granted payment deferrals related to COVID-19 totaling $310.8 million.

Deposits

Deposits	9 Months Ended
	Sep. 30, 2020
Banking and Thrift, Other Disclosures [Abstract]
Deposits	Deposits Deposits at September 30, 2020 and December 31, 2019 are summarized as follows (in thousands): September 30, 2020 December 31, 2019 Savings $ 1,310,231 983,714 Money market 2,124,907 1,738,202 NOW 2,603,551 2,092,413 Non-interest bearing 2,375,864 1,554,253 Certificates of deposit 1,144,688 734,027 Total deposits $ 9,559,241 7,102,609

Components of Net Periodic Bene

Components of Net Periodic Benefit Cost	9 Months Ended
	Sep. 30, 2020
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 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 ten Net periodic (decrease) increase in benefit cost for pension benefits and other post-retirement benefits for the three and nine months ended September 30, 2020 and 2019 includes the following components (in thousands): Three months ended September 30, Nine months ended September 30, Pension benefits Other post-retirement benefits Pension benefits Other post-retirement benefits 2020 2019 2020 2019 2020 2019 2020 2019 Service cost $ — — 19 20 $ — — 59 60 Interest cost 250 299 178 209 750 899 534 628 Expected return on plan assets (737) (640) — — (2,211) (1,922) — — Amortization of prior service cost — — — — — — — — Amortization of the net loss (gain) 174 254 (62) (206) 522 762 (186) (620) Net periodic (decrease) increase in benefit cost $ (313) (87) 135 23 $ (939) (261) 407 68 In its consolidated financial statements for the year ended December 31, 2019, the Company previously disclosed that it does not expect to contribute to the pension plan in 2020. As of September 30, 2020, 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 and nine months ended September 30, 2020 were calculated using the January 1, 2020 pension and other post-retirement benefits actuarial valuations.

Impact of Recent Accounting Pro

Impact of Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2020
Accounting Changes and Error Corrections [Abstract]
Impact of Recent Accounting Pronouncements	Impact of Recent Accounting Pronouncements Accounting Pronouncements Adopted in 2020 In May 2019, the Financial Accounting Standards Board ("FASB") issued ASU No. 2019-05, “Financial Instruments - Credit Losses (Topic 326); Targeted Transition Relief.” This ASU allows entities to irrevocably elect, upon adoption of ASU 2016-13, the fair value option on financial instruments that (1) were previously recorded at amortized cost and (2) are within the scope of ASC 326-20 if the instruments are eligible for the fair value option under ASC 825-10. The fair value option election does not apply to held-to-maturity debt securities. Entities are required to make this election on an instrument-by-instrument basis. ASU 2019-05 had the same effective date as ASU 2016-13 (i.e., the first quarter of 2020). The adoption of this guidance had no impact on the Company’s consolidated financial statements. In April 2019, the FASB issued ASU No. 2019-04, "Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments" which clarifies and improves areas of guidance related to the recently issued standards on credit losses, hedging, recognition and measurement. The most significant provisions of this ASU relate to how companies will estimate expected credit losses under Topic 326 by incorporating (1) expected recoveries of financial assets, including recoveries of amounts expected to be written off and those previously written off, and (2) clarifying that contractual extensions or renewal options that are not unconditionally cancellable by the lender are considered when determining the contractual term over which expected credit losses are measured. ASU No. 2019-04 is effective for reporting periods beginning January 1, 2020. The adoption of this guidance had no impact related to Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments on the Company’s consolidated financial statements. At January 1, 2020, a $1.3 million allowance for credit losses for off-balance sheet credit exposures was recorded related to extensions on construction loans and is reflected below in the ASU 2016-13 calculation. In August 2018, the FASB issued ASU No. 2018-13, “Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU eliminates, adds and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU No. 2018-13 was effective for interim and annual reporting periods beginning after December 15, 2019; early adoption was permitted. Entities are also allowed to elect early adoption of the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. The adoption of this guidance had no impact on the Company’s consolidated financial statements. In June 2016, the FASB issued ASU 2016-13 Accounting Pronouncements Not Yet Adopted ASU 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. The Company is evaluating the impacts of this ASU and have not yet determined whether LIBOR transition and this ASU 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	9 Months Ended
	Sep. 30, 2020
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 September 30, 2020, the Company recorded a $575,000 credit to the provision for credit losses for off-balance sheet credit exposures. This was primarily due to a reduction in the required allowance for these exposures as loss factors decreased in the current economic forecast compared to the economic forecast in the prior period. The provision for credit losses for the nine months ended September 30, 2020, totaled $5.7 million. The allowance for credit losses for off-balance sheet credit exposures was $8.9 million at September 30, 2020, included in other liabilities on the Consolidated Statements of Financial Condition.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2020
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 September 30, 2020 and December 31, 2019. 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 September 30, 2020 and December 31, 2019. 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 September 30, 2020 and December 31, 2019. The following tables present the assets and liabilities reported on the consolidated statements of financial condition at their fair values as of September 30, 2020 and December 31, 2019, by level within the fair value hierarchy (in thousands): Fair Value Measurements at Reporting Date Using: September 30, 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 $ 1,084 1,084 — — Mortgage-backed securities 934,171 — 934,171 — Asset-backed securities 53,868 — 53,868 — State and municipal obligations 70,518 — 70,518 — Corporate obligations 40,750 — 40,750 — Total available for sale debt securities 1,100,391 1,084 1,099,307 — Equity securities 869 869 — — Derivative assets 117,722 — 117,722 — $ 1,218,982 1,953 1,217,029 — Derivative liabilities $ 126,577 — 126,577 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 17,998 — — 17,998 Foreclosed assets 4,720 — — 4,720 $ 22,718 — — 22,718 Fair Value Measurements at Reporting Date Using: December 31, 2019 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 $ 947,430 — 947,430 — State and municipal obligations 4,079 — 4,079 — Corporate obligations 25,410 — 25,410 — Total available for sale debt securities 976,919 — 976,919 — Equity Securities 825 825 — — Derivative assets 39,305 — 39,305 — $ 1,017,049 825 1,016,224 — Derivative liabilities $ 39,356 — 39,356 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 20,403 — — 20,403 Foreclosed assets 2,715 — — 2,715 $ 23,118 — — 23,118 There were no transfers between Level 1, Level 2 and Level 3 during the three and nine months ended September 30, 2020. 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 September 30, 2020 and December 31, 2019 was $136.7 million and $77.0 million, respectively, representing cash collateral pledged to secure loan level swaps and reserves required by banking regulations. Held to Maturity Debt Securities, Net of Allowance for Credit Losses 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 September 30, 2020 and December 31, 2019. Fair values are presented by level within the fair value hierarchy. Fair Value Measurements at September 30, 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 $ 510,138 510,138 510,138 — — Available for sale debt securities: Agency obligations 1,084 1,084 1,084 — — Mortgage-backed securities 934,171 934,171 — 934,171 — Asset-backed securities 53,868 53,868 53,868 State and municipal obligations 70,518 70,518 — 70,518 — Corporate obligations 40,750 40,750 — 40,750 — Total available for sale debt securities $ 1,100,391 1,100,391 1,084 1,099,307 — Held to maturity debt securities, net of allowance for credit losses: Agency obligations 9,100 9,088 9,088 — — Mortgage-backed securities 75 77 — 77 — State and municipal obligations 428,465 449,448 — 449,448 — Corporate obligations 8,951 9,080 — 9,080 — Total held to maturity debt securities, net of allowance for credit losses $ 446,591 467,693 9,088 458,605 — FHLBNY stock 69,975 69,975 69,975 — — Equity Securities 869 869 869 — — Loans, net of allowance for credit losses 9,650,495 9,917,269 — — 9,917,269 Derivative assets 117,722 117,722 — 117,722 — Financial liabilities: Deposits other than certificates of deposits $ 8,414,553 8,414,553 8,414,553 — — Certificates of deposit 1,144,688 1,148,156 — 1,148,156 — Total deposits $ 9,559,241 9,562,709 8,414,553 1,148,156 — Borrowings 1,413,029 1,424,689 — 1,424,689 — Subordinated debentures 25,099 24,050 — 24,050 — Derivative liabilities 126,577 126,577 — 126,577 — Fair Value Measurements at December 31, 2019 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 $ 186,748 186,748 186,748 — — Available for sale debt securities: Mortgage-backed securities 947,430 947,430 — 947,430 — State and municipal obligations 4,079 4,079 — 4,079 — Corporate obligations 25,410 25,410 — 25,410 — Total available for sale debt securities $ 976,919 976,919 — 976,919 — Held to maturity debt securities: Agency obligations $ 6,599 6,601 6,601 — — Mortgage-backed securities 118 122 — 122 — State and municipal obligations 437,074 451,353 — 451,353 — Corporate obligations 9,838 9,890 — 9,890 — Total held to maturity debt securities $ 453,629 467,966 6,601 461,365 — FHLBNY stock 57,298 57,298 57,298 — — Equity Securities 825 825 825 — — Loans, net of allowance for credit losses 7,277,360 7,296,744 — — 7,296,744 Derivative assets 39,305 39,305 — 39,305 — Financial liabilities: Deposits other than certificates of deposits $ 6,368,582 6,368,582 6,368,582 — — Certificates of deposit 734,027 734,047 — 734,047 — Total deposits $ 7,102,609 7,102,629 6,368,582 734,047 — Borrowings 1,125,146 1,127,569 — 1,127,569 — Derivative liabilities 39,356 39,356 — 39,356 —

Other Comprehensive Income

Other Comprehensive Income	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Other Comprehensive Income	Other Comprehensive Income The following table presents the components of other comprehensive income, both gross and net of tax, for the three and nine months ended September 30, 2020 and 2019 (in thousands): Three months ended September 30, 2020 2019 Before Tax After Before Tax After Components of Other Comprehensive Income: Unrealized gains and losses on available for sale debt securities: Net unrealized (losses) gains arising during the period $ (578) 150 (428) 3,594 (980) 2,614 Reclassification adjustment for gains included in net income — — — — — — Total (578) 150 (428) 3,594 (980) 2,614 Unrealized gains on derivatives (cash flow hedges) 1,186 (306) 880 188 (51) 137 Amortization related to post-retirement obligations 115 (30) 85 48 (13) 35 Total other comprehensive income $ 723 (186) 537 3,830 (1,044) 2,786 Nine months ended September 30, 2020 2019 Before Tax After Before Tax After Components of Other Comprehensive Income: Unrealized gains and losses on available for sale debt securities: Net unrealized gains arising during the period $ 20,733 (5,345) 15,388 27,291 (7,437) 19,854 Reclassification adjustment for gains included in net income — — — — — — Total 20,733 (5,345) 15,388 27,291 (7,437) 19,854 Unrealized losses on derivatives (cash flow hedges) (8,242) 2,125 (6,117) (1,119) 306 (813) Amortization related to post-retirement obligations 322 (83) 239 78 (21) 57 Total other comprehensive income $ 12,813 (3,303) 9,510 26,250 (7,152) 19,098 The following tables present the changes in the components of accumulated other comprehensive income, net of tax, for the three and nine months ended September 30, 2020 and 2019 (in thousands): Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax 2020 2019 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 $ 24,562 (5,086) (6,682) 12,794 7,635 (3,603) (56) 3,976 Current - period other comprehensive income (428) 85 880 537 2,614 35 137 2,786 Balance at September 30, $ 24,134 (5,001) (5,802) 13,331 10,249 (3,568) 81 6,762 Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax 2020 2019 Unrealized Post- Retirement Unrealized (Losses) Gains on Derivatives (cash flow hedges) Accumulated Unrealized Gains (Losses) on Post- Retirement Unrealized Gains (Losses) on Derivatives (cash flow hedges) Accumulated Balance at December 31, $ 8,746 (5,240) 315 3,821 (9,605) (3,625) 894 (12,336) Current - period other comprehensive income 15,388 239 (6,117) 9,510 19,854 57 (813) 19,098 Balance at September 30, $ 24,134 (5,001) (5,802) 13,331 10,249 (3,568) 81 6,762 The following tables summarize the reclassifications from accumulated other comprehensive income (loss) to the consolidated statements of income for the three and nine months ended September 30, 2020 and 2019 (in thousands): Reclassifications From Accumulated Other Comprehensive Amount reclassified from AOCI for the three months ended September 30, Affected line item in the Consolidated 2020 2019 Details of AOCI: Post-retirement obligations: Amortization of actuarial losses $ 112 48 Compensation and employee benefits (1) (27) (13) Income tax expense Total reclassification $ 85 35 Net of tax Reclassifications From Accumulated Other Comprehensive Amount reclassified from AOCI for the nine months ended September 30, Affected line item in the Consolidated 2020 2019 Details of AOCI: Post-retirement obligations: Amortization of actuarial losses $ 336 142 Compensation and employee benefits (1) (97) (39) Income tax expense Total reclassification $ 239 103 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	9 Months Ended
	Sep. 30, 2020
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 executes 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 September 30, 2020 and December 31, 2019, the Company had 158 and 92 loan related interest rate swaps, respectively, with aggregate notional amounts of $2.44 billion and $1.61 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 September 30, 2020 and December 31, 2019, the Company had 13 credit derivatives, with aggregate notional amounts of $111.8 million and $106.0 million, respectively, from participations in interest rate swaps as part of these loan participation arrangements. At September 30, 2020 and December 31, 2019, the fair value of these credit derivatives were $540,000 and $47,000, 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 and nine months ended September 30, 2020 and 2019, such derivatives were used to hedge the variable cash outflows associated with FHLBNY borrowings. 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 September 30, 2020, the Company had 15 outstanding interest rate derivatives with an aggregate notional amount of $640.0 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 September 30, 2020 and December 31, 2019 (in thousands): At September 30, 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 $ 124,995 Other liabilities 126,577 Credit contracts Other assets 540 Other liabilities — Total derivatives not designated as a hedging instrument $ 125,535 126,577 Derivatives designated as a hedging instrument: Interest rate products Other assets $ — Other liabilities 7,813 Total derivatives designated as a hedging instrument $ — 7,813 At December 31, 2019 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 $ 38,830 Other liabilities 39,356 Credit contracts Other assets 47 Other liabilities — Total derivatives not designated as a hedging instrument $ 38,877 39,356 Derivatives designated as a hedging instrument: Interest rate products Other assets $ 428 Other liabilities — Total derivatives designated as a hedging instrument $ 428 — The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Income during the three and nine months ended September 30, 2020 and 2019 (in thousands). Gain (loss) recognized in income on derivatives for the three months ended Consolidated Statements of Income September 30, 2020 September 30, 2019 Derivatives not designated as a hedging instrument: Interest rate products Other income $ 26 2,307 Credit contracts Other income 460 (71) Total $ 486 2,236 Derivatives designated as a hedging instrument: Interest rate products Interest expense $ 855 157 Total $ 855 157 Gain (loss) recognized in income on derivatives for the nine months ended Consolidated Statements of Income September 30, 2020 September 30, 2019 Derivatives not designated as a hedging instrument: Interest rate products Other income $ (1,022) 212 Credit contracts Other income 459 (56) Total $ (563) 156 Derivatives designated as a hedging instrument: Interest rate products Interest expense $ 875 466 Total $ 875 466 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 September 30, 2020, 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 $135.5 million at September 30, 2020. The Company has minimum collateral posting thresholds with certain of its derivative counterparties, and has posted collateral of $136.1 million against its obligations under these agreements. If the Company had breached any of these provisions at September 30, 2020, it could have been required to settle its obligations under the agreements at the termination value.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2020
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 and nine months ended September 30, 2020, the out-of-scope revenue related to financial instruments was 81.9% and 83.5% of the Company's total revenue, respectively, compared to 85.8% and 87.0% for the three and nine months ended September 30, 2019, respectively. Revenue-generating activities that are within the scope of Topic 606, are components of non-interest income. These revenue streams are generally classified into three categories: 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 and nine months ended September 30, 2020 and 2019: Three months ended September 30, Nine months ended September 30, (in-thousands) 2020 2019 2020 2019 Non-interest income In-scope of Topic 606: Wealth management fees $ 6,847 6,084 19,075 16,406 Insurance agency income 1,711 — 1,711 — Banking service charges and other fees: Service charges on deposit accounts 2,473 3,386 7,520 9,853 Debit card and ATM fees 1,693 1,474 4,167 4,271 Total banking service charges and other fees 4,166 4,860 11,687 14,124 Total in-scope non-interest income 12,724 10,944 32,473 30,530 Total out-of-scope non-interest income 7,902 7,103 19,509 15,539 Total non-interest income $ 20,626 18,047 51,982 46,069 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. For customers acquired in the April 1, 2019, T&L transaction, the fee is based upon AUM at the end of the preceding quarter 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 either on a monthly or quarterly basis. The Company does not earn performance-based incentives. Other optional services such as tax return preparation, financial planning 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, are recognized as of the effective date of the insurance policy or the date on which the policy premium is processed into the Company's systems, whichever is later. Commission revenues related to installment billings are recognized on the later of the effective date of the policy or the invoice date. Subsequent commission adjustments are recognized upon our 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 we receive 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	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Leases	Leases On January 1, 2019, the Company adopted ASU 2016-02, "Leases" (Topic 842) and all subsequent ASUs that modified Topic 842. For the Company, Topic 842 primarily affected the accounting treatment for operating lease agreements in which the Company is the lessee. The Company elected the modified retrospective transition option effective with the period of adoption, elected not to recast comparative periods presented when transitioning to the new leasing standard and adjustments, if required, are made at the beginning of the period through a cumulative-effect adjustment to opening retained earnings. The Company also elected practical expedients, which allowed the Company to forego a reassessment of (1) whether any expired or existing contracts are or contain leases, (2) the lease classification for any expired or existing leases, and (3) the initial direct costs for any existing leases. The adoption of the new standard resulted in the Company recording a right-of-use asset and an operating lease liability of $44.9 million and $46.1 million, respectively, based on the present value of the expected remaining lease payments at January 1, 2019. In addition, on January 1, 2019, the Company had $5.9 million of net deferred gains associated with several sale and leaseback transactions executed prior to the adoption of ASU 2016-02. In accordance with the guidance, these net deferred gains were adjusted, net of income tax, as a cumulative-effect adjustment to opening retained earnings. 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. The following table represents the consolidated statements of financial condition classification of the Company’s right-of use-assets and lease liabilities at September 30, 2020 (in thousands): Classification September 30, 2020 December 31, 2019 Lease Right-of-Use Assets: Operating lease right-of-use assets Other assets $ 41,709 $ 41,754 Lease Liabilities: Operating lease liabilities Other liabilities $ 42,654 $ 42,815 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. At September 30, 2020, the weighted-average remaining lease term and the weighted-average discount rate for the Company's operating leases were 9.0 years and 3.25%, 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 September 30, 2020 Three months ended September 30, 2019 Lease Costs Operating lease cost $ 2,303 $ 2,127 Variable lease cost 754 727 Total lease cost $ 3,057 $ 2,854 Nine months ended September 30, 2020 Nine months ended September 30, 2019 Lease Costs Operating lease cost $ 6,565 $ 6,303 Variable lease cost 2,085 2,083 Total lease cost $ 8,650 $ 8,386 Cash paid for amounts included in the measurement of lease liabilities: Nine months ended September 30, 2020 Nine months ended September 30, 2019 Operating cash flows from operating leases $ 6,528 6,179 During the three and nine months ended September 30, 2020, the Company added nine new lease obligations related to the SB One acquisition. The Company recorded a $3.8 million right-of-use asset and lease liability for these lease obligations. Future minimum payments for operating leases with initial or remaining terms of one year or more as of September 30, 2020 were as follows (in thousands): Operating leases Twelve months ended: Remainder of 2020 $ 2,322 2021 7,018 2022 6,137 2023 5,622 2024 5,219 Thereafter 23,584 Total future minimum lease payments 49,902 Amounts representing interest 7,248 Present value of net future minimum lease payments $ 42,654
Leases	Leases On January 1, 2019, the Company adopted ASU 2016-02, "Leases" (Topic 842) and all subsequent ASUs that modified Topic 842. For the Company, Topic 842 primarily affected the accounting treatment for operating lease agreements in which the Company is the lessee. The Company elected the modified retrospective transition option effective with the period of adoption, elected not to recast comparative periods presented when transitioning to the new leasing standard and adjustments, if required, are made at the beginning of the period through a cumulative-effect adjustment to opening retained earnings. The Company also elected practical expedients, which allowed the Company to forego a reassessment of (1) whether any expired or existing contracts are or contain leases, (2) the lease classification for any expired or existing leases, and (3) the initial direct costs for any existing leases. The adoption of the new standard resulted in the Company recording a right-of-use asset and an operating lease liability of $44.9 million and $46.1 million, respectively, based on the present value of the expected remaining lease payments at January 1, 2019. In addition, on January 1, 2019, the Company had $5.9 million of net deferred gains associated with several sale and leaseback transactions executed prior to the adoption of ASU 2016-02. In accordance with the guidance, these net deferred gains were adjusted, net of income tax, as a cumulative-effect adjustment to opening retained earnings. 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. The following table represents the consolidated statements of financial condition classification of the Company’s right-of use-assets and lease liabilities at September 30, 2020 (in thousands): Classification September 30, 2020 December 31, 2019 Lease Right-of-Use Assets: Operating lease right-of-use assets Other assets $ 41,709 $ 41,754 Lease Liabilities: Operating lease liabilities Other liabilities $ 42,654 $ 42,815 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. At September 30, 2020, the weighted-average remaining lease term and the weighted-average discount rate for the Company's operating leases were 9.0 years and 3.25%, 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 September 30, 2020 Three months ended September 30, 2019 Lease Costs Operating lease cost $ 2,303 $ 2,127 Variable lease cost 754 727 Total lease cost $ 3,057 $ 2,854 Nine months ended September 30, 2020 Nine months ended September 30, 2019 Lease Costs Operating lease cost $ 6,565 $ 6,303 Variable lease cost 2,085 2,083 Total lease cost $ 8,650 $ 8,386 Cash paid for amounts included in the measurement of lease liabilities: Nine months ended September 30, 2020 Nine months ended September 30, 2019 Operating cash flows from operating leases $ 6,528 6,179 During the three and nine months ended September 30, 2020, the Company added nine new lease obligations related to the SB One acquisition. The Company recorded a $3.8 million right-of-use asset and lease liability for these lease obligations. Future minimum payments for operating leases with initial or remaining terms of one year or more as of September 30, 2020 were as follows (in thousands): Operating leases Twelve months ended: Remainder of 2020 $ 2,322 2021 7,018 2022 6,137 2023 5,622 2024 5,219 Thereafter 23,584 Total future minimum lease payments 49,902 Amounts representing interest 7,248 Present value of net future minimum lease payments $ 42,654

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2020
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. These interim financial statements include the assets and liabilities acquired from SB One on July 31, 2020, and include two months of results of operations related to the acquisition of SB One for the three and nine months ended September 30, 2020. The results of operations for the three and nine months ended September 30, 2020 are not necessarily indicative of the results of operations that may be expected for all of 2020.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2020
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 and nine months ended September 30, 2020 and 2019 (dollars in thousands, except per share amounts): Three months ended September 30, 2020 2019 Net Weighted Per Net Weighted Per Net income $ 27,143 $ 31,399 Basic earnings per share: Income available to common stockholders $ 27,143 72,519,123 $ 0.37 $ 31,399 64,511,956 $ 0.49 Dilutive shares 85,175 120,329 Diluted earnings per share: Income available to common stockholders $ 27,143 72,604,298 $ 0.37 $ 31,399 64,632,285 $ 0.49 Nine months ended September 30, 2020 2019 Net Weighted Per Net Weighted Per Net income $ 56,384 $ 86,682 Basic earnings per share: Income available to common stockholders $ 56,384 67,093,442 $ 0.84 $ 86,682 64,720,642 $ 1.34 Dilutive shares 80,434 132,341 Diluted earnings per share: Income available to common stockholders $ 56,384 67,173,876 $ 0.84 $ 86,682 64,852,983 $ 1.34

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2020
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, net of cash consideration paid (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 $ 1,784,945 Interest rate fair value adjustment on all loans 2,567 Credit fair value adjustment on non-PCD loans (21,397) Allowance for credit losses on PCD loans (13,586) Fair value of acquired loans 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 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

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2020
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 September 30, 2020 and December 31, 2019 (in thousands): September 30, 2020 Amortized Gross Gross Fair Agency obligations $ 1,081 4 (1) 1,084 Mortgage-backed securities 903,628 31,407 (864) 934,171 Asset-backed securities 53,018 877 (27) 53,868 State and municipal obligations 69,931 918 (331) 70,518 Corporate obligations 40,216 589 (55) 40,750 $ 1,067,874 33,795 (1,278) 1,100,391 December 31, 2019 Amortized Gross Gross Fair Mortgage-backed securities $ 936,196 12,367 (1,133) 947,430 State and municipal obligations 3,907 172 — 4,079 Corporate obligations 25,032 393 (15) 25,410 $ 965,135 12,932 (1,148) 976,919
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 September 30, 2020 and December 31, 2019 (in thousands): September 30, 2020 Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 478 (1) — — 478 (1) Mortgage-backed securities 84,276 (835) 8,489 (29) 92,765 (864) Asset-backed securities 7,624 (27) — — 7,624 (27) State and municipal obligations 34,033 (331) — — 34,033 (331) Corporate obligations 6,938 (11) 1,981 (44) 8,919 (55) $ 133,349 (1,205) 10,470 (73) 143,819 (1,278) December 31, 2019 Less than 12 months 12 months or longer Total Fair value Gross Fair value Gross Fair Gross Mortgage-backed securities $ 136,270 (629) 46,819 (504) 183,089 (1,133) Corporate obligations 2,013 (15) — — 2,013 (15) $ 138,283 (644) 46,819 (504) 185,102 (1,148)
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 September 30, 2020 and December 31, 2019 (in thousands): September 30, 2020 Amortized Gross Gross Allowance for credit losses Fair Agency obligations $ 9,100 4 (16) — 9,088 Mortgage-backed securities 75 2 — — 77 State and municipal obligations 428,532 21,018 (35) (67) 449,448 Corporate obligations 8,960 133 (4) (9) 9,080 $ 446,667 21,157 (55) (76) 467,693 At September 30, 2020, total amortized cost, net of allowance for credit losses totaled $446.6 million. December 31, 2019 Amortized Gross Gross Allowance for credit losses Fair Agency obligations $ 6,599 11 (9) — 6,601 Mortgage-backed securities 118 4 — — 122 State and municipal obligations 437,074 14,394 (115) — 451,353 Corporate obligations 9,838 58 (6) — 9,890 $ 453,629 14,467 (130) — 467,966
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 September 30, 2020 and December 31, 2019 (in thousands): September 30, 2020 Unrealized Losses Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 3,985 (16) — — 3,985 (16) State and municipal obligations 3,552 (18) 406 (17) 3,958 (35) Corporate obligations 1,577 (4) — — 1,577 (4) $ 9,114 (38) 406 (17) 9,520 (55) December 31, 2019 Unrealized Losses Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 3,601 (9) — — 3,601 (9) State and municipal obligations 7,675 (42) 2,093 (73) 9,768 (115) Corporate obligations 3,254 (6) — — 3,254 (6) $ 14,530 (57) 2,093 (73) 16,623 (130)
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 of the January 1, 2020 adoption of CECL on the allowance for credits for the loan portfolio (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Loans Residential $ 8,950 3,411 5,539 Commercial 17,118 12,885 4,233 Multi-family 9,519 3,370 6,149 Construction 4,152 5,885 (1,733) Total mortgage loans 39,739 25,551 14,188 Commercial loans 18,254 28,228 (9,974) Consumer loans 5,452 1,746 3,706 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
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 September 30, 2020 (in thousands): September 30, 2020 Total Portfolio AAA AA A BBB Not Rated Total Agency obligations $ 9,100 — — — — 9,100 Mortgage-backed securities 75 — — — — 75 State and municipal obligations 50,128 313,053 54,217 1,115 10,019 428,532 Corporate obligations — 2,719 5,816 400 25 8,960 $ 59,303 315,772 60,033 1,515 10,044 446,667 December 31, 2019 Total Portfolio AAA AA A BBB Not Rated Total Agency obligations $ 6,599 — — — — 6,599 Mortgage-backed securities 118 — — — — 118 State and municipal obligations 49,316 330,322 56,317 1,119 — 437,074 Corporate obligations — 3,128 6,335 350 25 9,838 $ 56,033 333,450 62,652 1,469 25 453,629
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 September 30, 2020, 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. September 30, 2020 Amortized Fair Due in one year or less $ — — Due after one year through five years 5,679 5,792 Due after five years through ten years 38,089 38,737 Due after ten years 66,379 66,739 $ 110,147 111,268
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 September 30, 2020 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. September 30, 2020 Amortized Fair Due in one year or less $ 22,685 22,792 Due after one year through five years 130,032 134,202 Due after five years through ten years 221,305 234,041 Due after ten years 72,569 76,658 $ 446,591 467,693

Loans Receivable and Allowanc_2

Loans Receivable and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Schedule of Summarized Loans Receivable	Loans receivable at September 30, 2020 and December 31, 2019 are summarized as follows (in thousands): September 30, 2020 December 31, 2019 Mortgage loans: Residential $ 1,320,222 1,077,689 Commercial 3,750,639 2,578,393 Multi-family 1,544,924 1,225,551 Construction 462,161 429,812 Total mortgage loans 7,077,946 5,311,445 Commercial loans Commercial owner occupied 934,104 853,269 Commercial non-owner occupied 906,355 732,277 Other commercial loans 449,737 49,213 Total commercial loans 2,290,196 1,634,759 Consumer loans 406,451 391,360 Total gross loans 9,774,593 7,337,564 PCI loans prior to CECL — 746 Premiums on purchased loans 1,514 2,474 Unearned discounts (26) (26) Net deferred fees (19,272) (7,873) Total loans $ 9,756,809 7,332,885
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). The September 30, 2020 balances include PCD loans, while the December 31, 2019 balances exclude PCI loans (in accordance with ASC 310, prior to the adoption of ASU 2016-13 on January 1, 2020): September 30, 2020 30-59 Days 60-89 Days Non-accrual Recorded Total Past Current Total Loans Non-accrual loans with no related allowance Mortgage loans: Residential $ 8,719 7,215 9,424 — 25,358 1,294,864 1,320,222 1,491 Commercial 3,914 4,629 16,568 — 25,111 3,725,528 3,750,639 4,134 Multi-family — 488 — — 488 1,544,436 1,544,924 — Construction 7,396 918 151 — 8,465 453,696 462,161 — Total mortgage loans 20,029 13,250 26,143 — 59,422 7,018,524 7,077,946 5,625 Commercial loans 5,575 949 21,269 — 27,793 2,262,403 2,290,196 6,060 Consumer loans 745 862 1,541 — 3,148 403,303 406,451 9 Total gross loans $ 26,349 15,061 48,953 — 90,363 9,684,230 9,774,593 11,694 December 31, 2019 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 $ 5,905 2,579 8,543 — 17,027 1,060,662 1,077,689 2,989 Commercial — — 5,270 — 5,270 2,573,123 2,578,393 — Multi-family — — — — — 1,225,551 1,225,551 — Construction — — — — — 429,812 429,812 — Total mortgage loans 5,905 2,579 13,813 — 22,297 5,289,148 5,311,445 2,989 Commercial loans 2,383 95 25,160 — 27,638 1,607,121 1,634,759 3,238 Consumer loans 1,276 337 1,221 — 2,834 388,526 391,360 569 Total gross loans $ 9,564 3,011 40,194 — 52,769 7,284,795 7,337,564 6,796
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 and nine months ended September 30, 2020 and 2019 was as follows (in thousands): Three months ended September 30, Mortgage loans Commercial loans Consumer loans Total 2020 Balance at beginning of period $ 54,871 25,284 6,104 86,259 Provision charged to operations 2,922 2,767 722 6,411 Initial allowance on credit loans related to PCD loans 11,984 1,582 20 13,586 Recoveries of loans previously charged-off 35 679 144 858 Loans charged-off (22) (727) (51) (800) Balance at end of period $ 69,790 29,585 6,939 106,314 2019 Balance at beginning of period $ 27,280 33,549 1,981 62,810 Provision charged to operations (2,092) 2,880 (288) 500 Recoveries of loans previously charged-off 24 126 343 493 Loans charged-off (131) (6,212) (116) (6,459) Balance at end of period $ 25,081 30,343 1,920 57,344 Nine months ended September 30, Mortgage loans Commercial loans Consumer loans Total 2020 Balance at beginning of period $ 25,511 28,263 1,751 55,525 Increase (decrease) due to the initial adoption of CECL - Retained earnings 14,188 (9,974) 3,706 7,920 Initial allowance on credit loans related to PCD loans 11,984 1,582 20 13,586 Provision charged to operations 17,987 12,672 1,352 32,011 Recoveries of loans previously charged-off 143 1,597 370 2,110 Loans charged-off (23) (4,555) (260) (4,838) Balance at end of period $ 69,790 29,585 6,939 106,314 2019 Balance at beginning of period $ 27,678 25,693 2,191 55,562 Provision (credited) charged to operations (2,814) 13,337 (323) 10,200 Recoveries of loans previously charged-off 361 291 596 1,248 Loans charged-off (144) (8,978) (544) (9,666) Balance at end of period $ 25,081 30,343 1,920 57,344 The allowance for credit losses is summarized by portfolio segment and impairment classification as follows (in thousands): September 30, 2020 Mortgage Commercial loans Consumer loans Total Individually evaluated for impairment $ 1,391 1,876 33 3,300 Collectively evaluated for impairment 68,399 27,709 6,906 103,014 Total gross loans $ 69,790 29,585 6,939 106,314 December 31, 2019 Mortgage Commercial loans Consumer Total Individually evaluated for impairment $ 1,580 3,462 25 5,067 Collectively evaluated for impairment 23,931 24,801 1,726 50,458 Total gross loans $ 25,511 28,263 1,751 55,525
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 of the January 1, 2020 adoption of CECL on the allowance for credits for the loan portfolio (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Loans Residential $ 8,950 3,411 5,539 Commercial 17,118 12,885 4,233 Multi-family 9,519 3,370 6,149 Construction 4,152 5,885 (1,733) Total mortgage loans 39,739 25,551 14,188 Commercial loans 18,254 28,228 (9,974) Consumer loans 5,452 1,746 3,706 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): September 30, 2020 Mortgage Commercial Consumer Total Portfolio Individually evaluated for impairment $ 43,397 20,963 1,449 65,809 Collectively evaluated for impairment 7,034,549 2,269,233 405,002 9,708,784 Total gross loans $ 7,077,946 2,290,196 406,451 9,774,593 December 31, 2019 Mortgage Commercial Consumer Total Portfolio Individually evaluated for impairment $ 39,910 28,357 2,374 70,641 Collectively evaluated for impairment 5,271,535 1,606,402 388,986 7,266,923 Total gross loans $ 5,311,445 1,634,759 391,360 7,337,564
Schedule of Troubled Debt Restructuring	The following tables present the number of loans modified as TDRs during the three and nine months ended September 30, 2020 and 2019, along with their balances immediately prior to the modification date and post-modification as of September 30, 2020 and 2019 (in thousands): For the three months ended September 30, 2020 September 30, 2019 Troubled Debt Restructurings Number of Pre-Modification Post-Modification Number of Pre-Modification Post-Modification ($ in thousands) Mortgage loans: Residential 1 $ 91 $ 79 — $ — $ — Total mortgage loans 1 91 79 — — — Commercial loans 1 1,399 1,399 — — — Consumer loans — — — 1 20 16 Total restructured loans 2 $ 1,490 $ 1,478 1 $ 20 $ 16 For the nine months ended September 30, 2020 September 30, 2019 Troubled Debt Restructurings Number of Pre-Modification Post-Modification Number of Pre-Modification Post-Modification ($ in thousands) Mortgage loans: Residential 2 $ 434 $ 360 2 $ 749 $ 716 Commercial — — — 1 14,010 14,010 Total mortgage loans 2 434 360 3 14,759 14,726 Commercial loans 5 2,882 2,791 7 2,707 1,878 Consumer loans — — — 1 20 16 Total restructured loans 7 $ 3,316 $ 3,151 11 $ 17,486 $ 16,620
Schedule of Troubled Debt Restructurings Subsequently Defaulted	The following table presents loans modified as TDRs within the previous 12 months from September 30, 2020 and 2019, and for which there was a payment default (90 days or more past due) at the quarter ended September 30, 2020 and 2019. September 30, 2020 September 30, 2019 Troubled Debt Restructurings Subsequently Defaulted Number of Loans Outstanding Recorded Investment Number of Loans Outstanding Recorded ($ in thousands) Mortgage loans: Residential — $ — 1 $ 578 Total mortgage loans — — 1 578 Total restructured loans — $ — 1 $ 578
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 $ 1,784,945 Interest rate fair value adjustment on all loans 2,567 Credit fair value adjustment on non-PCD loans (21,397) Allowance for credit losses on PCD loans (13,586) Fair value of acquired loans 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 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
Summary of Impaired Loans Receivable by Class	The following table presents loans individually evaluated for impairment by class and loan category, excluding PCD loans (in thousands): September 30, 2020 December 31, 2019 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 $ 14,144 11,541 — 11,694 386 13,478 10,739 — 10,910 533 Commercial 19,543 19,543 — 19,548 431 — — — — — Total 33,687 31,084 — 31,242 817 13,478 10,739 — 10,910 533 Commercial loans 7,959 5,713 — 7,300 29 3,927 3,696 — 4,015 17 Consumer loans 1,396 895 — 921 39 2,086 1,517 — 1,491 86 Total impaired loans $ 43,042 37,692 — 39,463 885 19,491 15,952 — 16,416 636 Loans with an allowance recorded Mortgage loans: Residential $ 7,922 7,503 728 7,440 235 10,860 10,326 829 10,454 428 Commercial 4,810 4,810 663 4,822 41 18,845 18,845 751 18,862 569 Total 12,732 12,313 1,391 12,262 276 29,705 29,171 1,580 29,316 997 Commercial loans 17,050 15,250 1,876 18,280 293 27,762 24,661 3,462 27,527 444 Consumer loans 569 554 33 560 13 868 857 25 878 46 Total impaired loans $ 30,351 28,117 3,300 31,102 582 58,335 54,689 5,067 57,721 1,487 Total impaired loans Mortgage loans: Residential $ 22,066 19,044 728 19,134 621 24,338 21,065 829 21,364 961 Commercial 24,353 24,353 663 24,370 472 18,845 18,845 751 18,862 569 Total 46,419 43,397 1,391 43,504 1,093 43,183 39,910 1,580 40,226 1,530 Commercial loans 25,009 20,963 1,876 25,580 322 31,689 28,357 3,462 31,542 461 Consumer loans 1,965 1,449 33 1,481 52 2,954 2,374 25 2,369 132 Total impaired loans $ 73,393 65,809 3,300 70,565 1,467 77,826 70,641 5,067 74,137 2,123
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 September 30, 2020 Total portfolio Residential Commercial mortgage Multi-family Construction Total Commercial Consumer Total Loans (1) Special mention $ 4,483 54,368 101 872 59,824 168,833 362 229,019 Substandard 41,255 52,847 124 — 94,226 103,132 3,680 201,038 Doubtful — — — — — 76 — 76 Loss — — — — — — — — Total criticized and classified 45,738 107,215 225 872 154,050 272,041 4,042 430,133 Pass/Watch 1,274,484 3,643,424 1,544,699 461,289 6,923,896 2,018,155 402,409 9,344,460 Total $ 1,320,222 3,750,639 1,544,924 462,161 7,077,946 2,290,196 406,451 9,774,593 2020 Special mention $ — — — 872 872 657 — 1,529 Substandard 2,079 — — — 2,079 — 25 2,104 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 2,079 — — 872 2,951 657 25 3,633 Pass/Watch 198,722 375,324 230,034 28,187 832,267 586,510 27,605 1,446,382 Total gross loans $ 200,801 375,324 230,034 29,059 835,218 587,167 27,630 1,450,015 2019 Special mention $ 1,753 $ 12,434 $ — $ — $ 14,187 $ 6,755 $ — $ 20,942 Substandard 6,321 — — — 6,321 2,742 343 9,406 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 8,074 12,434 — — 20,508 9,497 343 30,348 Pass/Watch 139,391 547,969 139,633 164,333 991,326 225,447 46,745 1,263,518 Total gross loans $ 147,465 560,403 139,633 164,333 1,011,834 234,944 47,088 1,293,866 2018 Special mention $ 318 6,630 — — 6,948 10,908 — 17,856 Substandard 2,152 — — — 2,152 4,948 356 7,456 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 2,470 6,630 — — 9,100 15,856 356 25,312 Pass/Watch 79,552 361,309 171,555 119,980 732,396 169,974 40,927 943,297 Total gross loans $ 82,022 367,939 171,555 119,980 741,496 185,830 41,283 968,609 2017 Special mention $ — — — — — 31,465 — 31,465 Substandard 3,233 17,529 — — 20,762 8,040 15 28,817 Doubtful — — — — — — — — Loss — — — — — — — — Total criticized and classified 3,233 17,529 — — 20,762 39,505 15 60,282 Pass/Watch 80,813 387,846 134,166 37,564 640,389 148,737 33,340 822,466 Total gross loans $ 84,046 405,375 134,166 37,564 661,151 188,242 33,355 882,748 2016 and prior Special mention $ 2,412 35,304 101 — 37,817 119,048 362 157,227 Substandard 27,470 35,318 124 — 62,912 87,402 2,941 153,255 Doubtful — — — — — 76 — 76 Loss — — — — — — — — Total criticized and classified 29,882 70,622 225 — 100,729 206,526 3,303 310,558 Pass/Watch 805,888 2,041,598 869,536 111,225 3,828,247 1,094,013 257,095 5,179,355 Total gross loans $ 835,770 2,112,220 869,761 111,225 3,928,976 1,300,539 260,398 5,489,913 At December 31, 2019 Residential Commercial mortgage Multi-family Construction Total Commercial Consumer Total loans Special mention $ 2,402 46,758 — — 49,160 79,248 286 128,694 Substandard 10,204 13,458 — 6,181 29,843 57,015 1,668 88,526 Doubtful — — — — — 836 — 836 Loss — — — — — — — — Total criticized and classified 12,606 60,216 — 6,181 79,003 137,099 1,954 218,056 Pass/Watch 1,065,083 2,518,177 1,225,551 423,631 5,232,442 1,497,660 389,406 7,119,508 Total $ 1,077,689 2,578,393 1,225,551 429,812 5,311,445 1,634,759 391,360 7,337,564

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2020
Banking and Thrift, Other Disclosures [Abstract]
Schedule of Deposits	Deposits at September 30, 2020 and December 31, 2019 are summarized as follows (in thousands): September 30, 2020 December 31, 2019 Savings $ 1,310,231 983,714 Money market 2,124,907 1,738,202 NOW 2,603,551 2,092,413 Non-interest bearing 2,375,864 1,554,253 Certificates of deposit 1,144,688 734,027 Total deposits $ 9,559,241 7,102,609

Components of Net Periodic Be_2

Components of Net Periodic Benefit Cost (Tables)	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Net Periodic Benefit Cost (Increase)	Net periodic (decrease) increase in benefit cost for pension benefits and other post-retirement benefits for the three and nine months ended September 30, 2020 and 2019 includes the following components (in thousands): Three months ended September 30, Nine months ended September 30, Pension benefits Other post-retirement benefits Pension benefits Other post-retirement benefits 2020 2019 2020 2019 2020 2019 2020 2019 Service cost $ — — 19 20 $ — — 59 60 Interest cost 250 299 178 209 750 899 534 628 Expected return on plan assets (737) (640) — — (2,211) (1,922) — — Amortization of prior service cost — — — — — — — — Amortization of the net loss (gain) 174 254 (62) (206) 522 762 (186) (620) Net periodic (decrease) increase in benefit cost $ (313) (87) 135 23 $ (939) (261) 407 68

Allowance for Credit Losses o_2

Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Tables)	9 Months Ended
	Sep. 30, 2020
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 of the January 1, 2020 adoption of CECL on the allowance for credits for the loan portfolio (in thousands): January 1, 2020 As reported under CECL Prior to CECL Impact of CECL adoption Loans Residential $ 8,950 3,411 5,539 Commercial 17,118 12,885 4,233 Multi-family 9,519 3,370 6,149 Construction 4,152 5,885 (1,733) Total mortgage loans 39,739 25,551 14,188 Commercial loans 18,254 28,228 (9,974) Consumer loans 5,452 1,746 3,706 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)	9 Months Ended
	Sep. 30, 2020
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 September 30, 2020 and December 31, 2019, by level within the fair value hierarchy (in thousands): Fair Value Measurements at Reporting Date Using: September 30, 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 $ 1,084 1,084 — — Mortgage-backed securities 934,171 — 934,171 — Asset-backed securities 53,868 — 53,868 — State and municipal obligations 70,518 — 70,518 — Corporate obligations 40,750 — 40,750 — Total available for sale debt securities 1,100,391 1,084 1,099,307 — Equity securities 869 869 — — Derivative assets 117,722 — 117,722 — $ 1,218,982 1,953 1,217,029 — Derivative liabilities $ 126,577 — 126,577 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 17,998 — — 17,998 Foreclosed assets 4,720 — — 4,720 $ 22,718 — — 22,718 Fair Value Measurements at Reporting Date Using: December 31, 2019 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 $ 947,430 — 947,430 — State and municipal obligations 4,079 — 4,079 — Corporate obligations 25,410 — 25,410 — Total available for sale debt securities 976,919 — 976,919 — Equity Securities 825 825 — — Derivative assets 39,305 — 39,305 — $ 1,017,049 825 1,016,224 — Derivative liabilities $ 39,356 — 39,356 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 20,403 — — 20,403 Foreclosed assets 2,715 — — 2,715 $ 23,118 — — 23,118
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 September 30, 2020 and December 31, 2019. Fair values are presented by level within the fair value hierarchy. Fair Value Measurements at September 30, 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 $ 510,138 510,138 510,138 — — Available for sale debt securities: Agency obligations 1,084 1,084 1,084 — — Mortgage-backed securities 934,171 934,171 — 934,171 — Asset-backed securities 53,868 53,868 53,868 State and municipal obligations 70,518 70,518 — 70,518 — Corporate obligations 40,750 40,750 — 40,750 — Total available for sale debt securities $ 1,100,391 1,100,391 1,084 1,099,307 — Held to maturity debt securities, net of allowance for credit losses: Agency obligations 9,100 9,088 9,088 — — Mortgage-backed securities 75 77 — 77 — State and municipal obligations 428,465 449,448 — 449,448 — Corporate obligations 8,951 9,080 — 9,080 — Total held to maturity debt securities, net of allowance for credit losses $ 446,591 467,693 9,088 458,605 — FHLBNY stock 69,975 69,975 69,975 — — Equity Securities 869 869 869 — — Loans, net of allowance for credit losses 9,650,495 9,917,269 — — 9,917,269 Derivative assets 117,722 117,722 — 117,722 — Financial liabilities: Deposits other than certificates of deposits $ 8,414,553 8,414,553 8,414,553 — — Certificates of deposit 1,144,688 1,148,156 — 1,148,156 — Total deposits $ 9,559,241 9,562,709 8,414,553 1,148,156 — Borrowings 1,413,029 1,424,689 — 1,424,689 — Subordinated debentures 25,099 24,050 — 24,050 — Derivative liabilities 126,577 126,577 — 126,577 — Fair Value Measurements at December 31, 2019 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 $ 186,748 186,748 186,748 — — Available for sale debt securities: Mortgage-backed securities 947,430 947,430 — 947,430 — State and municipal obligations 4,079 4,079 — 4,079 — Corporate obligations 25,410 25,410 — 25,410 — Total available for sale debt securities $ 976,919 976,919 — 976,919 — Held to maturity debt securities: Agency obligations $ 6,599 6,601 6,601 — — Mortgage-backed securities 118 122 — 122 — State and municipal obligations 437,074 451,353 — 451,353 — Corporate obligations 9,838 9,890 — 9,890 — Total held to maturity debt securities $ 453,629 467,966 6,601 461,365 — FHLBNY stock 57,298 57,298 57,298 — — Equity Securities 825 825 825 — — Loans, net of allowance for credit losses 7,277,360 7,296,744 — — 7,296,744 Derivative assets 39,305 39,305 — 39,305 — Financial liabilities: Deposits other than certificates of deposits $ 6,368,582 6,368,582 6,368,582 — — Certificates of deposit 734,027 734,047 — 734,047 — Total deposits $ 7,102,609 7,102,629 6,368,582 734,047 — Borrowings 1,125,146 1,127,569 — 1,127,569 — Derivative liabilities 39,356 39,356 — 39,356 —

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Components of Other Comprehensive Income (Loss)	The following table presents the components of other comprehensive income, both gross and net of tax, for the three and nine months ended September 30, 2020 and 2019 (in thousands): Three months ended September 30, 2020 2019 Before Tax After Before Tax After Components of Other Comprehensive Income: Unrealized gains and losses on available for sale debt securities: Net unrealized (losses) gains arising during the period $ (578) 150 (428) 3,594 (980) 2,614 Reclassification adjustment for gains included in net income — — — — — — Total (578) 150 (428) 3,594 (980) 2,614 Unrealized gains on derivatives (cash flow hedges) 1,186 (306) 880 188 (51) 137 Amortization related to post-retirement obligations 115 (30) 85 48 (13) 35 Total other comprehensive income $ 723 (186) 537 3,830 (1,044) 2,786 Nine months ended September 30, 2020 2019 Before Tax After Before Tax After Components of Other Comprehensive Income: Unrealized gains and losses on available for sale debt securities: Net unrealized gains arising during the period $ 20,733 (5,345) 15,388 27,291 (7,437) 19,854 Reclassification adjustment for gains included in net income — — — — — — Total 20,733 (5,345) 15,388 27,291 (7,437) 19,854 Unrealized losses on derivatives (cash flow hedges) (8,242) 2,125 (6,117) (1,119) 306 (813) Amortization related to post-retirement obligations 322 (83) 239 78 (21) 57 Total other comprehensive income $ 12,813 (3,303) 9,510 26,250 (7,152) 19,098
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 and nine months ended September 30, 2020 and 2019 (in thousands): Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax 2020 2019 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 $ 24,562 (5,086) (6,682) 12,794 7,635 (3,603) (56) 3,976 Current - period other comprehensive income (428) 85 880 537 2,614 35 137 2,786 Balance at September 30, $ 24,134 (5,001) (5,802) 13,331 10,249 (3,568) 81 6,762 Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax 2020 2019 Unrealized Post- Retirement Unrealized (Losses) Gains on Derivatives (cash flow hedges) Accumulated Unrealized Gains (Losses) on Post- Retirement Unrealized Gains (Losses) on Derivatives (cash flow hedges) Accumulated Balance at December 31, $ 8,746 (5,240) 315 3,821 (9,605) (3,625) 894 (12,336) Current - period other comprehensive income 15,388 239 (6,117) 9,510 19,854 57 (813) 19,098 Balance at September 30, $ 24,134 (5,001) (5,802) 13,331 10,249 (3,568) 81 6,762
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 and nine months ended September 30, 2020 and 2019 (in thousands): Reclassifications From Accumulated Other Comprehensive Amount reclassified from AOCI for the three months ended September 30, Affected line item in the Consolidated 2020 2019 Details of AOCI: Post-retirement obligations: Amortization of actuarial losses $ 112 48 Compensation and employee benefits (1) (27) (13) Income tax expense Total reclassification $ 85 35 Net of tax Reclassifications From Accumulated Other Comprehensive Amount reclassified from AOCI for the nine months ended September 30, Affected line item in the Consolidated 2020 2019 Details of AOCI: Post-retirement obligations: Amortization of actuarial losses $ 336 142 Compensation and employee benefits (1) (97) (39) Income tax expense Total reclassification $ 239 103 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)	9 Months Ended
	Sep. 30, 2020
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 September 30, 2020 and December 31, 2019 (in thousands): At September 30, 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 $ 124,995 Other liabilities 126,577 Credit contracts Other assets 540 Other liabilities — Total derivatives not designated as a hedging instrument $ 125,535 126,577 Derivatives designated as a hedging instrument: Interest rate products Other assets $ — Other liabilities 7,813 Total derivatives designated as a hedging instrument $ — 7,813 At December 31, 2019 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 $ 38,830 Other liabilities 39,356 Credit contracts Other assets 47 Other liabilities — Total derivatives not designated as a hedging instrument $ 38,877 39,356 Derivatives designated as a hedging instrument: Interest rate products Other assets $ 428 Other liabilities — Total derivatives designated as a hedging instrument $ 428 —
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 and nine months ended September 30, 2020 and 2019 (in thousands). Gain (loss) recognized in income on derivatives for the three months ended Consolidated Statements of Income September 30, 2020 September 30, 2019 Derivatives not designated as a hedging instrument: Interest rate products Other income $ 26 2,307 Credit contracts Other income 460 (71) Total $ 486 2,236 Derivatives designated as a hedging instrument: Interest rate products Interest expense $ 855 157 Total $ 855 157 Gain (loss) recognized in income on derivatives for the nine months ended Consolidated Statements of Income September 30, 2020 September 30, 2019 Derivatives not designated as a hedging instrument: Interest rate products Other income $ (1,022) 212 Credit contracts Other income 459 (56) Total $ (563) 156 Derivatives designated as a hedging instrument: Interest rate products Interest expense $ 875 466 Total $ 875 466

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2020
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 and nine months ended September 30, 2020 and 2019: Three months ended September 30, Nine months ended September 30, (in-thousands) 2020 2019 2020 2019 Non-interest income In-scope of Topic 606: Wealth management fees $ 6,847 6,084 19,075 16,406 Insurance agency income 1,711 — 1,711 — Banking service charges and other fees: Service charges on deposit accounts 2,473 3,386 7,520 9,853 Debit card and ATM fees 1,693 1,474 4,167 4,271 Total banking service charges and other fees 4,166 4,860 11,687 14,124 Total in-scope non-interest income 12,724 10,944 32,473 30,530 Total out-of-scope non-interest income 7,902 7,103 19,509 15,539 Total non-interest income $ 20,626 18,047 51,982 46,069

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2020
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 September 30, 2020 (in thousands): Classification September 30, 2020 December 31, 2019 Lease Right-of-Use Assets: Operating lease right-of-use assets Other assets $ 41,709 $ 41,754 Lease Liabilities: Operating lease liabilities Other liabilities $ 42,654 $ 42,815
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 September 30, 2020 Three months ended September 30, 2019 Lease Costs Operating lease cost $ 2,303 $ 2,127 Variable lease cost 754 727 Total lease cost $ 3,057 $ 2,854 Nine months ended September 30, 2020 Nine months ended September 30, 2019 Lease Costs Operating lease cost $ 6,565 $ 6,303 Variable lease cost 2,085 2,083 Total lease cost $ 8,650 $ 8,386 Cash paid for amounts included in the measurement of lease liabilities: Nine months ended September 30, 2020 Nine months ended September 30, 2019 Operating cash flows from operating leases $ 6,528 6,179
Schedule of Future Minimum Payments	Future minimum payments for operating leases with initial or remaining terms of one year or more as of September 30, 2020 were as follows (in thousands): Operating leases Twelve months ended: Remainder of 2020 $ 2,322 2021 7,018 2022 6,137 2023 5,622 2024 5,219 Thereafter 23,584 Total future minimum lease payments 49,902 Amounts representing interest 7,248 Present value of net future minimum lease payments $ 42,654

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accounting Policies [Abstract]
Net income	$ 27,143	$ 31,399	$ 56,384	$ 86,682
Basic earnings per share:
Income available to common stockholders, basic	$ 27,143	$ 31,399	$ 56,384	$ 86,682
Weighted average common shares outstanding, basic (in shares)	72,519,123	64,511,956	67,093,442	64,720,642
Income available to common stockholders, per share amount, basic (usd per share)	$ 0.37	$ 0.49	$ 0.84	$ 1.34
Dilutive shares (in shares)	85,175	120,329	80,434	132,341
Diluted earnings per share:
Income available to common stockholders, diluted	$ 27,143	$ 31,399	$ 56,384	$ 86,682
Weighted average common shares outstanding, diluted (in shares)	72,604,298	64,632,285	67,173,876	64,852,983
Income available to common stockholders, per share amount, diluted (usd per share)	$ 0.37	$ 0.49	$ 0.84	$ 1.34

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Narrative) (Details) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Accounting Policies [Abstract]
Anti-dilutive stock options and awards excluded from computation of earnings per share (in shares)	1,100,000	678,583

Business Combinations - SB One

Business Combinations - SB One Bancorp Acquisition (Details) $ in Thousands	Jul. 31, 2020USD ($)numberOfBankingOfficesshares	Apr. 01, 2019USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Fair value of acquired loans at July 31, 2020			$ 822,400	$ 822,400
Fair value premium				10,600
Allowance for credit losses			106,314	106,314	$ 86,259	$ 55,525	$ 55,525	$ 57,344	$ 62,810	$ 55,562
Subordinated debentures			25,099	25,099			$ 0
SB One Bancorp
Business Acquisition [Line Items]
Fair value of acquired loans at July 31, 2020	$ 315,784
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	13,600
Bank-owned life insurance	37,200
Time deposit discount				4,300
Subordinated debentures			27,500	27,500
Merger-related expenses			$ 2,000	3,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Other Than Goodwill	2,195,708
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
Tirschwell & Loewy
Business Acquisition [Line Items]
Total cost of acquisition		$ 21,600

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
Borrowed funds	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) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Jul. 31, 2020
Business Acquisition [Line Items]
Gross amortized cost basis at July 31, 2020				$ 1,784,945
Interest rate fair value adjustment on all loans				2,567
Credit fair value adjustment on non-PCD loans				(21,397)
Fair value of acquired loans at July 31, 2020	$ 822,400	$ 822,400
Allowance for credit losses on PCD loans				(13,586)
Loans, net	1,752,529	$ 1,752,529	$ 0
SB One Bancorp
Business Acquisition [Line Items]
Interest rate fair value adjustment on all loans				(7,988)
Fair value of acquired loans at July 31, 2020				315,784
Allowance for credit losses on PCD loans				$ (13,586)
Loans, net	$ 294,210

Business Combinations - Tirschw

Business Combinations - Tirschwell & Loewy, Inc Acquisition (Details) - USD ($) $ in Thousands	Apr. 01, 2019	Dec. 31, 2019	Sep. 30, 2020
Business Acquisition [Line Items]
Fair value of acquired loans at July 31, 2020			$ 822,400
Tirschwell & Loewy
Business Acquisition [Line Items]
Goodwill recorded as result of acquisition	$ 8,200
Contingent consideration liability	$ 6,600		9,400
Additional consideration period to former stakeholders	3 years
Contingent consideration limit	$ 11,000		$ 11,000
Cash consideration	15,000
Increase in estimated fair value of contingent consideration liability		$ 2,800
Total cost of acquisition	21,600
Customer Relationships | Tirschwell & Loewy
Business Acquisition [Line Items]
Other intangibles assets	12,600
Other Intangible Assets | Tirschwell & Loewy
Business Acquisition [Line Items]
Other intangibles assets	$ 800

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)securityposition	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)securityposition	Sep. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)securityposition	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Available for sale debt securities, at fair value	$ 1,100,391,000		$ 1,100,391,000				$ 976,919,000
Securities held to maturity, at fair value	$ 446,591,000		$ 446,591,000				$ 453,629,000
Total number of all held to maturity and available for sale securities in an unrealized loss position | security	68		68				85
Allowance for credit losses	$ (76,000)		$ (76,000)			$ 70,000	$ 0
Retained earnings	694,240,000		694,240,000				695,273,000
Securities available for sale, amortized cost	$ 1,067,874,000		1,067,874,000				$ 965,135,000
Proceeds from sales of securities			$ 13,905,000	$ 0
Securities available for sale, number of securities in an unrealized loss position | position	55		55				50
Unrealized loss	$ 1,278,000		$ 1,278,000				$ 1,148,000
Held to maturity securities, proceeds from calls	13,700,000	$ 14,400,000	39,500,000	26,600,000
Held to maturity securities, recognized gain on calls	0	0	55,000	0
Held to maturity securities, recognized loss on calls	0
Investment securities held to maturity, fair value	467,693,000		467,693,000				467,966,000
Allowance for credit losses	$ 106,314,000	$ 57,344,000	$ 106,314,000	$ 57,344,000	$ 86,259,000	55,525,000	$ 55,525,000	$ 62,810,000	$ 55,562,000
Number of securities in an unrealized loss position | security	13		13				35
AAA
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, at fair value	$ 59,303,000		$ 59,303,000				$ 56,033,000
Amount of total portfolio			13.00%
AA
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, at fair value	315,772,000		$ 315,772,000				333,450,000
Amount of total portfolio			71.00%
A
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, at fair value	60,033,000		$ 60,033,000				62,652,000
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	$ 17,000,000		$ 17,000,000
Securities available for sale, number of securities in an unrealized loss position | position	1		1
Unrealized loss	$ 2,000,000		$ 2,000,000
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	934,171,000		934,171,000				947,430,000
Allowance for credit losses	0		0				0
Securities available for sale, amortized cost	903,628,000		903,628,000				936,196,000
Unrealized loss	864,000		864,000				1,133,000
Held-to-maturity securities, amortized cost	75,000		75,000
Investment securities held to maturity, fair value	77,000		77,000				122,000
Allowance for credit losses	76,000		76,000
Mortgage-Backed Securities | AAA
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, at fair value	75,000		75,000				118,000
Mortgage-Backed Securities | AA
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, at fair value	0		0				0
Mortgage-Backed Securities | A
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, at fair value	$ 0		$ 0				$ 0

Investment Securities (Securiti

Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,067,874	$ 965,135
Gross unrealized gains	33,795	12,932
Gross unrealized losses	(1,278)	(1,148)
Available for sale debt securities, at fair value	1,100,391	976,919
Mortgage-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	903,628	936,196
Gross unrealized gains	31,407	12,367
Gross unrealized losses	(864)	(1,133)
Available for sale debt securities, at fair value	934,171	947,430
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	53,018
Gross unrealized gains	877
Gross unrealized losses	(27)
Available for sale debt securities, at fair value	53,868
State And Municipal Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	69,931	3,907
Gross unrealized gains	918	172
Gross unrealized losses	(331)	0
Available for sale debt securities, at fair value	70,518	4,079
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	40,216	25,032
Gross unrealized gains	589	393
Gross unrealized losses	(55)	(15)
Available for sale debt securities, at fair value	40,750	$ 25,410
Investments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	957,700
Available for sale debt securities, at fair value	$ 989,100

Investment Securities (Availabl

Investment Securities (Available for Sale by Contractual Maturity) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,067,874	$ 965,135
Fair value	1,100,391	$ 976,919
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	0
Due after one year through five years, amortized cost	5,679
Due after five years through ten years, amortized cost	38,089
Due after ten years, amortized cost	66,379
Amortized cost	110,147
Due in one year or less, fair value	0
Due after one year through five years, fair value	5,792
Due after five years through ten years, fair value	38,737
Due after ten years, fair value	66,739
Fair value	$ 111,268

Investment Securities (Disclosu

Investment Securities (Disclosure Regarding Length of Time on Securities Available for Sale with Temporary Impairment) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 133,349	$ 138,283
Less than 12 months, gross unrealized losses	(1,205)	(644)
12 months or longer, fair value	10,470	46,819
12 months or longer, gross unrealized losses	(73)	(504)
Total, fair value	143,819	185,102
Total, gross unrealized losses	(1,278)	(1,148)
Agency Obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value			$ 478
Less than 12 months, gross unrealized losses			(1)
12 months or longer, fair value			0
12 months or longer, gross unrealized losses			0
Total, fair value			478
Total, gross unrealized losses			$ (1)
Mortgage-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	84,276	136,270
Less than 12 months, gross unrealized losses	(835)	(629)
12 months or longer, fair value	8,489	46,819
12 months or longer, gross unrealized losses	(29)	(504)
Total, fair value	92,765	183,089
Total, gross unrealized losses	(864)	(1,133)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	7,624
Less than 12 months, gross unrealized losses	(27)
12 months or longer, fair value	0
12 months or longer, gross unrealized losses	0
Total, fair value	7,624
Total, gross unrealized losses	(27)
State And Municipal Obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	34,033
Less than 12 months, gross unrealized losses	(331)
12 months or longer, fair value	0
12 months or longer, gross unrealized losses	0
Total, fair value	34,033
Total, gross unrealized losses	(331)
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	6,938	2,013
Less than 12 months, gross unrealized losses	(11)	(15)
12 months or longer, fair value	1,981	0
12 months or longer, gross unrealized losses	(44)	0
Total, fair value	8,919	2,013
Total, gross unrealized losses	$ (55)	$ (15)

Investment Securities (Held to

Investment Securities (Held to Maturity) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 446,667		$ 453,629
Gross unrealized gains	21,157		14,467
Gross unrealized losses	(55)		(130)
Allowance for credit losses	(76)	$ 70	0
Held to maturity debt securities	467,693		467,966
Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,100		6,599
Gross unrealized gains	4		11
Gross unrealized losses	(16)		(9)
Allowance for credit losses	0		0
Held to maturity debt securities	9,088		6,601
Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	75		118
Gross unrealized gains	2		4
Gross unrealized losses	0		0
Allowance for credit losses	0		0
Held to maturity debt securities	77		122
State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	428,532		437,074
Gross unrealized gains	21,018		14,394
Gross unrealized losses	(35)		(115)
Allowance for credit losses	(67)		0
Held to maturity debt securities	449,448		451,353
Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	8,960		9,838
Gross unrealized gains	133		58
Gross unrealized losses	(4)		(6)
Allowance for credit losses	(9)		0
Held to maturity debt securities	$ 9,080		$ 9,890

Investment Securities (Securi_2

Investment Securities (Securities Held to Maturity by Contractual Maturity) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 446,591	$ 453,629
Fair value	467,693	$ 467,966
Held-to-maturity Securities
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less, amortized cost	22,685
Due after one year through five years, amortized cost	130,032
Due after five years through ten years, amortized cost	221,305
Due after ten years, amortized cost	72,569
Amortized cost	446,591
Due in one year or less, fair value	22,792
Due after one year through five years, fair value	134,202
Due after five years through ten years, fair value	234,041
Due after ten years, fair value	76,658
Fair value	$ 467,693

Investment Securities - (ASU 20

Investment Securities - (ASU 2016-13 Adoption Impact) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses	$ (76)	$ 70	$ 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	$ (9)		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	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	$ 9,114	$ 14,530
Less than 12 months, gross unrealized losses	(38)	(57)
12 months or longer, fair value	406	2,093
12 months or longer, gross unrealized losses	(17)	(73)
Total, fair value	9,520	16,623
Total, gross unrealized losses	(55)	(130)
Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	3,985	3,601
Less than 12 months, gross unrealized losses	(16)	(9)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	3,985	3,601
Total, gross unrealized losses	(16)	(9)
State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	3,552	7,675
Less than 12 months, gross unrealized losses	(18)	(42)
12 months or longer, fair value	406	2,093
12 months or longer, gross unrealized losses	(17)	(73)
Total, fair value	3,958	9,768
Total, gross unrealized losses	(35)	(115)
Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	1,577	3,254
Less than 12 months, gross unrealized losses	(4)	(6)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	1,577	3,254
Total, gross unrealized losses	$ (4)	$ (6)

Investment Securities (Amortize

Investment Securities (Amortized Cost of held to Maturity Debt Securities by Year of Originations and Credit Rating) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 446,591	$ 453,629
Total	446,667	453,629
Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Total	9,100	6,599
Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Total	75	118
State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Total	428,532	437,074
Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Total	8,960	9,838
AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	59,303	56,033
AAA | Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,100	6,599
AAA | Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	75	118
AAA | State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	50,128	49,316
AAA | Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	315,772	333,450
AA | Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
AA | Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
AA | State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	313,053	330,322
AA | Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	2,719	3,128
A
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	60,033	62,652
A | Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
A | Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
A | State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	54,217	56,317
A | Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	5,816	6,335
BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	1,515	1,469
BBB | Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
BBB | Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
BBB | State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	1,115	1,119
BBB | Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	400	350
Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	10,044	25
Not Rated | Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
Not Rated | Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
Not Rated | State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	10,019	0
Not Rated | Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 25	$ 25

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Credit Losses (Narrative) (Detail)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2020USD ($)counterpartySecurityLoan	Mar. 31, 2020USD ($)SecurityLoan	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)SecurityLoantroubled_debt_restructuringcounterpartyborrower	Sep. 30, 2019USD ($)SecurityLoan	Dec. 31, 2019USD ($)borrowertroubled_debt_restructuringSecurityLoan	Jun. 30, 2020USD ($)	Jan. 01, 2020USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less allowance for credit losses	$ 106,314,000		$ 57,344,000	$ 106,314,000	$ 57,344,000	$ 55,525,000	$ 86,259,000	$ 55,525,000	$ 62,810,000	$ 55,562,000
Retained earnings	694,240,000			694,240,000		695,273,000
Principal amount of nonaccrual loans	49,000,000			49,000,000		40,200,000
Loans less than 90 days past due	$ 4,900,000			$ 4,900,000		$ 13,100,000
Number of loans 90 days past due and still accruing | SecurityLoan	0			0		0
Impaired loan defined floor limit (greater than)	$ 1,000,000			$ 1,000,000
Impaired loans number | SecurityLoan		158		151
Impaired loans	65,809,000			$ 65,809,000		$ 70,641,000
Number of troubled debt restructurings | troubled_debt_restructuring				122		147
Number of borrowers | borrower				119		128
Loans and leases receivable, impaired, nonperforming, accrual of interest	38,000,000			$ 38,000,000		$ 42,700,000
Collateral-dependent impaired loans	18,000,000			18,000,000		20,400,000
Provision for credit losses	6,400,000		500,000	32,017,000	10,200,000
Charge off, impaired loan	$ 612,000		$ 5,700,000	$ 3,800,000	$ 7,700,000
Weighted average modified interest rate	4.82%			5.46%
Weighted average prior modification rate	4.83%			5.51%
Number of payment defaults for loans modified as TDRs | SecurityLoan				0	1
Purchased credit-impaired loans						746,000
Allowances for loan losses	$ 3,300,000			$ 3,300,000		5,067,000
Impaired financing receivable with no related allowance	$ 37,700,000			37,700,000		16,000,000
Average balance of impaired loans		$ 74,100,000		$ 70,565,000		74,137,000
Number of PPP loans | counterparty	1,289			1,289
Paycheck protection program	$ 474,800,000			$ 474,800,000
Consumer Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	9,000			9,000
Commercial Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	13,200,000			13,200,000
Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	4,700,000			4,700,000
Impaired Loans Troubled Debt Restructurings
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans number | SecurityLoan		133
Loans and leases receivable, impaired, nonperforming, accrual of interest						$ 48,300,000
Allowances for loan losses	$ 0			$ 421,000
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 Fair Value for Available For Sale Debt Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	$ 1,067,874	$ 965,135
Gross unrealized gains	33,795	12,932
Gross unrealized losses	(1,278)	(1,148)
Available for sale debt securities, at fair value	1,100,391	976,919
Agency Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost			$ 1,081
Gross unrealized gains			4
Gross unrealized losses			(1)
Available for sale debt securities, at fair value			$ 1,084
Mortgage-Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	903,628	936,196
Gross unrealized gains	31,407	12,367
Gross unrealized losses	(864)	(1,133)
Available for sale debt securities, at fair value	934,171	947,430
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	53,018
Gross unrealized gains	877
Gross unrealized losses	(27)
Available for sale debt securities, at fair value	53,868
State And Municipal Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	69,931	3,907
Gross unrealized gains	918	172
Gross unrealized losses	(331)	0
Available for sale debt securities, at fair value	70,518	4,079
Corporate Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	40,216	25,032
Gross unrealized gains	589	393
Gross unrealized losses	(55)	(15)
Available for sale debt securities, at fair value	$ 40,750	$ 25,410

Loans Receivable and Allowanc_5

Loans Receivable and Allowance for Credit Losses (Schedule of Summarized Loans Receivable) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 9,774,593	$ 7,337,564
Premiums on purchased loans	1,514	2,474
Unearned discounts	(26)	(26)
Net deferred fees	(19,272)	(7,873)
Total loans	9,756,809	7,332,885
Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	9,774,593
Purchased credit-impaired (PCI) loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	0	746
Mortgage Portfolio Segment
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	7,077,946	5,311,445
Mortgage Portfolio Segment | Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	7,077,946	5,311,445
Mortgage Portfolio Segment | Residential
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,320,222	1,077,689
Mortgage Portfolio Segment | Residential | Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,320,222
Mortgage Portfolio Segment | Commercial
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	3,750,639	2,578,393
Mortgage Portfolio Segment | Commercial | Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	3,750,639
Mortgage Portfolio Segment | Multi-Family
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,544,924	1,225,551
Mortgage Portfolio Segment | Multi-Family | Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,544,924
Mortgage Portfolio Segment | Construction
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	462,161	429,812
Mortgage Portfolio Segment | Construction | Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	462,161
Commercial Loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	2,290,196	1,634,759
Commercial Loans | Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	2,290,196	1,634,759
Commercial Loans | Commercial owner occupied | Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	934,104	853,269
Commercial Loans | Commercial non-owner occupied | Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	906,355	732,277
Commercial Loans | Other commercial loans | Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	449,737	49,213
Consumer Loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	406,451	$ 391,360
Consumer Loans | Loans, excluding purchased credit-impaired loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 406,451

Loans Receivable and Allowanc_6

Loans Receivable and Allowance for Credit Losses (Summary of Aging Loans Receivable by Portfolio Segment and Class) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 48,953	$ 40,194
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	90,363	52,769
Current	9,684,230	7,284,795
Total gross loans	9,774,593	7,337,564
Non-accrual loans with no related allowance	11,694	6,796
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	26,349	9,564
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	15,061	3,011
Mortgage Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	26,143	13,813
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	59,422	22,297
Current	7,018,524	5,289,148
Total gross loans	7,077,946	5,311,445
Non-accrual loans with no related allowance	5,625	2,989
Mortgage Portfolio Segment | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	9,424	8,543
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	25,358	17,027
Current	1,294,864	1,060,662
Total gross loans	1,320,222	1,077,689
Non-accrual loans with no related allowance	1,491	2,989
Mortgage Portfolio Segment | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	16,568	5,270
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	25,111	5,270
Current	3,725,528	2,573,123
Total gross loans	3,750,639	2,578,393
Non-accrual loans with no related allowance	4,134	0
Mortgage Portfolio Segment | Multi-Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	488	0
Current	1,544,436	1,225,551
Total gross loans	1,544,924	1,225,551
Non-accrual loans with no related allowance	0	0
Mortgage Portfolio Segment | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	151	0
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	8,465	0
Current	453,696	429,812
Total gross loans	462,161	429,812
Non-accrual loans with no related allowance	0	0
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	20,029	5,905
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	8,719	5,905
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	3,914	0
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	0	0
Mortgage Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	7,396	0
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	13,250	2,579
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	7,215	2,579
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	4,629	0
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	488	0
Mortgage Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	918	0
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	21,269	25,160
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	27,793	27,638
Current	2,262,403	1,607,121
Total gross loans	2,290,196	1,634,759
Non-accrual loans with no related allowance	6,060	3,238
Commercial Loans | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	5,575	2,383
Commercial Loans | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	949	95
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,541	1,221
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	3,148	2,834
Current	403,303	388,526
Total gross loans	406,451	391,360
Non-accrual loans with no related allowance	9	569
Consumer Loans | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	745	1,276
Consumer Loans | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	$ 862	$ 337

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Credit Losses (Summary of Loans Receivable by Portfolio Segment and Impairment Method) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 65,809	$ 70,641
Collectively evaluated for impairment	9,708,784	7,266,923
Total gross loans	9,774,593	7,337,564
Mortgage Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	43,397	39,910
Collectively evaluated for impairment	7,034,549	5,271,535
Total gross loans	7,077,946	5,311,445
Commercial Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	20,963	28,357
Collectively evaluated for impairment	2,269,233	1,606,402
Total gross loans	2,290,196	1,634,759
Consumer Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	1,449	2,374
Collectively evaluated for impairment	405,002	388,986
Total gross loans	$ 406,451	$ 391,360

Loans Receivable and Allowanc_8

Loans Receivable and Allowance for Credit Losses (Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 3,300	$ 5,067
Collectively evaluated for impairment	103,014	50,458
Total	106,314	55,525
Mortgage Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	1,391	1,580
Collectively evaluated for impairment	68,399	23,931
Total	69,790
Commercial Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	1,876	3,462
Collectively evaluated for impairment	27,709	24,801
Total	29,585
Consumer Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	33	25
Collectively evaluated for impairment	6,906	$ 1,726
Total	$ 6,939

Loans Receivable and Allowanc_9

Loans Receivable and Allowance for Credit Losses (Schedule of Troubled Debt Restructurings) (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)counterpartysecurity	Sep. 30, 2019USD ($)counterpartysecurity	Sep. 30, 2020USD ($)counterpartySecurityLoan	Sep. 30, 2019USD ($)counterpartySecurityLoan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | counterparty	2	1	7	11
Pre-Modification Outstanding Recorded  Investment	$ 1,490	$ 20	$ 3,316	$ 17,486
Post-Modification Outstanding Recorded Investment	$ 1,478	$ 16	$ 3,151	$ 16,620
Mortgage Portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | counterparty	1	0	2	3
Pre-Modification Outstanding Recorded  Investment	$ 91	$ 0	$ 434	$ 14,759
Post-Modification Outstanding Recorded Investment	$ 79	$ 0	$ 360	$ 14,726
Mortgage Portfolio | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | counterparty	1	0	2	2
Pre-Modification Outstanding Recorded  Investment	$ 91	$ 0	$ 434	$ 749
Post-Modification Outstanding Recorded Investment	$ 79	$ 0	$ 360	$ 716
Mortgage Portfolio | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | counterparty			0	1
Pre-Modification Outstanding Recorded  Investment			$ 0	$ 14,010
Post-Modification Outstanding Recorded Investment			$ 0	$ 14,010
Commercial Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | counterparty	1	0	5	7
Pre-Modification Outstanding Recorded  Investment	$ 1,399	$ 0	$ 2,882	$ 2,707
Post-Modification Outstanding Recorded Investment	$ 1,399	$ 0	$ 2,791	$ 1,878
Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	0	1	0	1
Pre-Modification Outstanding Recorded  Investment	$ 0	$ 20	$ 0	$ 20
Post-Modification Outstanding Recorded Investment	$ 0	$ 16	$ 0	$ 16

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Credit Losses (Schedule of Trouble Debt Restructuring Subsequently Defaulted) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)SecurityLoan	Sep. 30, 2019USD ($)SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | SecurityLoan	0	1
Outstanding Recorded Investment | $	$ 0	$ 578
Mortgage Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | SecurityLoan	0	1
Outstanding Recorded Investment | $	$ 0	$ 578
Mortgage Portfolio | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | SecurityLoan	0	1
Outstanding Recorded Investment | $	$ 0	$ 578

Loans Receivable and Allowan_11

Loans Receivable and Allowance for Credit Losses (Schedule of Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 86,259	$ 62,810	$ 55,525	$ 55,562
Increase (decrease) due to the initial adoption of CECL - Retained earnings			7,920
Initial allowance on credit loans related to PCD loans	13,586		13,586
Provision charged to operations	6,411	500	32,011	10,200
Recoveries of loans previously charged-off	858	493	2,110	1,248
Loans charged-off	(800)	(6,459)	(4,838)	(9,666)
Balance at end of period	106,314	57,344	106,314	57,344
Mortgage Portfolio Segment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	54,871	27,280	25,511	27,678
Increase (decrease) due to the initial adoption of CECL - Retained earnings			14,188
Initial allowance on credit loans related to PCD loans	11,984		11,984
Provision charged to operations	2,922	(2,092)	17,987	(2,814)
Recoveries of loans previously charged-off	35	24	143	361
Loans charged-off	(22)	(131)	(23)	(144)
Balance at end of period	69,790	25,081	69,790	25,081
Commercial Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	25,284	33,549	28,263	25,693
Increase (decrease) due to the initial adoption of CECL - Retained earnings			(9,974)
Initial allowance on credit loans related to PCD loans	1,582		1,582
Provision charged to operations	2,767	2,880	12,672	13,337
Recoveries of loans previously charged-off	679	126	1,597	291
Loans charged-off	(727)	(6,212)	(4,555)	(8,978)
Balance at end of period	29,585	30,343	29,585	30,343
Consumer Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	6,104	1,981	1,751	2,191
Increase (decrease) due to the initial adoption of CECL - Retained earnings			3,706
Initial allowance on credit loans related to PCD loans	20		20
Provision charged to operations	722	(288)	1,352	(323)
Recoveries of loans previously charged-off	144	343	370	596
Loans charged-off	(51)	(116)	(260)	(544)
Balance at end of period	$ 6,939	$ 1,920	$ 6,939	$ 1,920

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Credit Losses (Impact of ASC 326 Adoption) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses	$ 106,314	$ 86,259	$ 55,525	$ 55,525	$ 57,344	$ 62,810	$ 55,562
Mortgage Portfolio
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			25,551
Mortgage Portfolio | Residential
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			3,411
Mortgage Portfolio | Commercial
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			12,885
Mortgage Portfolio | Multifamily
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			3,370
Mortgage Portfolio | Construction
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			5,885
Commercial Loans
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses	29,585	25,284	28,228	28,263	30,343	33,549	25,693
Consumer Loans
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses	$ 6,939	$ 6,104	1,746	$ 1,751	$ 1,920	$ 1,981	$ 2,191
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			14,188
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Residential
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			5,539
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Commercial
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			4,233
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Multifamily
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			6,149
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Construction
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			(1,733)
Cumulative Effect, Period of Adoption, Adjustment | Commercial Loans
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			(9,974)
Cumulative Effect, Period of Adoption, Adjustment | Consumer Loans
New Accounting Pronouncement, Early Adoption [Line Items]
Allowance for credit losses			$ 3,706

Loans Receivable and Allowan_13

Loans Receivable and Allowance for Credit Losses (Summary of Impaired Loans Receivable by Class) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance		$ 43,042	$ 19,491
Loans with no related allowance, Recorded Investment		37,692	15,952
Loans with no related allowance, Average Recorded Investment		39,463	16,416
Loans with no related allowance, Interest Income Recognized		885	636
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance		30,351	58,335
Loans with an allowance recorded, Recorded Investment		28,117	54,689
Loans with an allowance recorded, Average Recorded Investment		31,102	57,721
Loans with an allowance recorded, Interest Income Recognized		582	1,487
Total impaired loans
Unpaid Principal Balance		73,393	77,826
Recorded Investment		65,809	70,641
Related Allowance		3,300	5,067
Average Recorded Investment	$ 74,100	70,565	74,137
Interest Income Recognized		1,467	2,123
Mortgage Portfolio Segment
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance		33,687	13,478
Loans with no related allowance, Recorded Investment		31,084	10,739
Loans with no related allowance, Average Recorded Investment		31,242	10,910
Loans with no related allowance, Interest Income Recognized		817	533
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance		12,732	29,705
Loans with an allowance recorded, Recorded Investment		12,313	29,171
Loans with an allowance recorded, Average Recorded Investment		12,262	29,316
Loans with an allowance recorded, Interest Income Recognized		276	997
Total impaired loans
Unpaid Principal Balance		46,419	43,183
Recorded Investment		43,397	39,910
Related Allowance		1,391	1,580
Average Recorded Investment		43,504	40,226
Interest Income Recognized		1,093	1,530
Mortgage Portfolio Segment | Residential
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance		14,144	13,478
Loans with no related allowance, Recorded Investment		11,541	10,739
Loans with no related allowance, Average Recorded Investment		11,694	10,910
Loans with no related allowance, Interest Income Recognized		386	533
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance		7,922	10,860
Loans with an allowance recorded, Recorded Investment		7,503	10,326
Loans with an allowance recorded, Average Recorded Investment		7,440	10,454
Loans with an allowance recorded, Interest Income Recognized		235	428
Total impaired loans
Unpaid Principal Balance		22,066	24,338
Recorded Investment		19,044	21,065
Related Allowance		728	829
Average Recorded Investment		19,134	21,364
Interest Income Recognized		621	961
Mortgage Portfolio Segment | Commercial
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance		19,543	0
Loans with no related allowance, Recorded Investment		19,543	0
Loans with no related allowance, Average Recorded Investment		19,548	0
Loans with no related allowance, Interest Income Recognized		431	0
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance		4,810	18,845
Loans with an allowance recorded, Recorded Investment		4,810	18,845
Loans with an allowance recorded, Average Recorded Investment		4,822	18,862
Loans with an allowance recorded, Interest Income Recognized		41	569
Total impaired loans
Unpaid Principal Balance		24,353	18,845
Recorded Investment		24,353	18,845
Related Allowance		663	751
Average Recorded Investment		24,370	18,862
Interest Income Recognized		472	569
Commercial Loans
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance		7,959	3,927
Loans with no related allowance, Recorded Investment		5,713	3,696
Loans with no related allowance, Average Recorded Investment		7,300	4,015
Loans with no related allowance, Interest Income Recognized		29	17
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance		17,050	27,762
Loans with an allowance recorded, Recorded Investment		15,250	24,661
Loans with an allowance recorded, Average Recorded Investment		18,280	27,527
Loans with an allowance recorded, Interest Income Recognized		293	444
Total impaired loans
Unpaid Principal Balance		25,009	31,689
Recorded Investment		20,963	28,357
Related Allowance		1,876	3,462
Average Recorded Investment		25,580	31,542
Interest Income Recognized		322	461
Consumer Loans
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance		1,396	2,086
Loans with no related allowance, Recorded Investment		895	1,517
Loans with no related allowance, Average Recorded Investment		921	1,491
Loans with no related allowance, Interest Income Recognized		39	86
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance		569	868
Loans with an allowance recorded, Recorded Investment		554	857
Loans with an allowance recorded, Average Recorded Investment		560	878
Loans with an allowance recorded, Interest Income Recognized		13	46
Total impaired loans
Unpaid Principal Balance		1,965	2,954
Recorded Investment		1,449	2,374
Related Allowance		33	25
Average Recorded Investment		1,481	2,369
Interest Income Recognized		$ 52	$ 132

Loans Receivable and Allowan_14

Loans Receivable and Allowance for Credit Losses (Summary of COVID-19 Impact) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Aug. 03, 2020	Jul. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 9,756,809			$ 7,332,885
SB One Bancorp
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 47,500
First 90-day Deferral Period
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans			$ 27,000
Second 90-Day Deferral Period, Expected To Be Granted
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans			84,900
Completed Deferral Period
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans			198,900
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		92,400
Retail Properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		43,700
Restaurants
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		31,400
Suburban Office Space
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		15,100
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		42,700
Payment Deferral | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans			$ 1,310,000
Percentage of total loans			16.80%
Payment Deferral | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 310,800	$ 310,800
Percentage of total loans			3.20%

Loans Receivable and Allowan_15

Loans Receivable and Allowance for Credit Losses (Summary of Loans Receivable by Credit Quality Risk Rating Indicator) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 9,756,809	$ 7,332,885
Total gross loans	9,774,593
2020	1,450,015
2019	1,293,866
2018	968,609
2017	882,748
2016 and prior	5,489,913
Total classified and criticized
Financing Receivable, Recorded Investment [Line Items]
Total loans	430,133	218,056
2020	3,633
2019	30,348
2018	25,312
2017	60,282
2016 and prior	310,558
Criticized and classified loans, gross	310,800
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	229,019	128,694
2020	1,529
2019	20,942
2018	17,856
2017	31,465
2016 and prior	157,227
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	201,038	88,526
2020	2,104
2019	9,406
2018	7,456
2017	28,817
2016 and prior	153,255
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	76	836
2020	0
2019	0
2018	0
2017	0
2016 and prior	76
Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,344,460	7,119,508
2020	1,446,382
2019	1,263,518
2018	943,297
2017	822,466
2016 and prior	5,179,355
Mortgage Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	7,077,946	5,311,445
2020	835,218
2019	1,011,834
2018	741,496
2017	661,151
2016 and prior	3,928,976
Mortgage Portfolio Segment | Total classified and criticized
Financing Receivable, Recorded Investment [Line Items]
Total loans	154,050	79,003
2020	2,951
2019	20,508
2018	9,100
2017	20,762
2016 and prior	100,729
Mortgage Portfolio Segment | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	59,824	49,160
2020	872
2019	14,187
2018	6,948
2017	0
2016 and prior	37,817
Mortgage Portfolio Segment | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	94,226	29,843
2020	2,079
2019	6,321
2018	2,152
2017	20,762
2016 and prior	62,912
Mortgage Portfolio Segment | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,923,896	5,232,442
2020	832,267
2019	991,326
2018	732,396
2017	640,389
2016 and prior	3,828,247
Mortgage Portfolio Segment | Residential
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,320,222
2020	200,801
2019	147,465
2018	82,022
2017	84,046
2016 and prior	835,770
Mortgage Portfolio Segment | Residential | Total classified and criticized
Financing Receivable, Recorded Investment [Line Items]
Total loans	45,738	12,606
2020	2,079
2019	8,074
2018	2,470
2017	3,233
2016 and prior	29,882
Mortgage Portfolio Segment | Residential | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,483	2,402
2020	0
2019	1,753
2018	318
2017	0
2016 and prior	2,412
Mortgage Portfolio Segment | Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,255	10,204
2020	2,079
2019	6,321
2018	2,152
2017	3,233
2016 and prior	27,470
Mortgage Portfolio Segment | Residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Residential | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Residential | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,274,484	1,065,083
2020	198,722
2019	139,391
2018	79,552
2017	80,813
2016 and prior	805,888
Mortgage Portfolio Segment | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	3,750,639
2020	375,324
2019	560,403
2018	367,939
2017	405,375
2016 and prior	2,112,220
Mortgage Portfolio Segment | Commercial | Total classified and criticized
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,215	60,216
2020	0
2019	12,434
2018	6,630
2017	17,529
2016 and prior	70,622
Mortgage Portfolio Segment | Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	54,368	46,758
2020	0
2019	12,434
2018	6,630
2017	0
2016 and prior	35,304
Mortgage Portfolio Segment | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	52,847	13,458
2020	0
2019	0
2018	0
2017	17,529
2016 and prior	35,318
Mortgage Portfolio Segment | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Commercial | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Commercial | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,643,424	2,518,177
2020	375,324
2019	547,969
2018	361,309
2017	387,846
2016 and prior	2,041,598
Mortgage Portfolio Segment | Multi-Family
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,544,924
2020	230,034
2019	139,633
2018	171,555
2017	134,166
2016 and prior	869,761
Mortgage Portfolio Segment | Multi-Family | Total classified and criticized
Financing Receivable, Recorded Investment [Line Items]
Total loans	225	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	225
Mortgage Portfolio Segment | Multi-Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	101	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	101
Mortgage Portfolio Segment | Multi-Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	124	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	124
Mortgage Portfolio Segment | Multi-Family | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Multi-Family | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Multi-Family | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,544,699	1,225,551
2020	230,034
2019	139,633
2018	171,555
2017	134,166
2016 and prior	869,536
Mortgage Portfolio Segment | Construction
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	462,161
2020	29,059
2019	164,333
2018	119,980
2017	37,564
2016 and prior	111,225
Mortgage Portfolio Segment | Construction | Total classified and criticized
Financing Receivable, Recorded Investment [Line Items]
Total loans	872	6,181
2020	872
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	872	0
2020	872
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	6,181
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Mortgage Portfolio Segment | Construction | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	461,289	423,631
2020	28,187
2019	164,333
2018	119,980
2017	37,564
2016 and prior	111,225
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,290,196	1,634,759
2020	587,167
2019	234,944
2018	185,830
2017	188,242
2016 and prior	1,300,539
Commercial Loans | Total classified and criticized
Financing Receivable, Recorded Investment [Line Items]
Total loans	272,041	137,099
2020	657
2019	9,497
2018	15,856
2017	39,505
2016 and prior	206,526
Commercial Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	168,833	79,248
2020	657
2019	6,755
2018	10,908
2017	31,465
2016 and prior	119,048
Commercial Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	103,132	57,015
2020	0
2019	2,742
2018	4,948
2017	8,040
2016 and prior	87,402
Commercial Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	76	836
2020	0
2019	0
2018	0
2017	0
2016 and prior	76
Commercial Loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Commercial Loans | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,018,155	1,497,660
2020	586,510
2019	225,447
2018	169,974
2017	148,737
2016 and prior	1,094,013
Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	406,451
2020	27,630
2019	47,088
2018	41,283
2017	33,355
2016 and prior	260,398
Consumer Loans | Total classified and criticized
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,042	1,954
2020	25
2019	343
2018	356
2017	15
2016 and prior	3,303
Consumer Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	362	286
2020	0
2019	0
2018	0
2017	0
2016 and prior	362
Consumer Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,680	1,668
2020	25
2019	343
2018	356
2017	15
2016 and prior	2,941
Consumer Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Consumer Loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
2020	0
2019	0
2018	0
2017	0
2016 and prior	0
Consumer Loans | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans	402,409	$ 389,406
2020	27,605
2019	46,745
2018	40,927
2017	33,340
2016 and prior	$ 257,095

Deposits (Detail)

Deposits (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Banking and Thrift, Other Disclosures [Abstract]
Savings	$ 1,310,231	$ 983,714
Money market	2,124,907	1,738,202
NOW	2,603,551	2,092,413
Non-interest bearing	2,375,864	1,554,253
Certificates of deposit	1,144,688	734,027
Total deposits	$ 9,559,241	$ 7,102,609

Components of Net Periodic Be_3

Components of Net Periodic Benefit Cost (Narrative) (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension benefits
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	250	299	750	899
Expected return on plan assets	(737)	(640)	(2,211)	(1,922)
Amortization of prior service cost	0	0	0	0
Amortization of the net loss (gain)	174	254	522	762
Net periodic (decrease) increase in benefit cost	(313)	(87)	(939)	(261)
Other post-retirement benefits
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	19	20	59	60
Interest cost	178	209	534	628
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of the net loss (gain)	(62)	(206)	(186)	(620)
Net periodic (decrease) increase in benefit cost	$ 135	$ 23	$ 407	$ 68

Impact of Recent Accounting P_2

Impact of Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Allowance for credit losses	$ 55,525	$ 106,314	$ 55,525	$ 55,562	$ 86,259	$ 57,344	$ 62,810
Accounting standards update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member
Provision for credit losses for off-balance sheet credit exposure	$ 0	$ 8,900
Retained earnings		$ 694,240	$ 695,273
Cumulative Effect, Period of Adoption, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Allowance for credit losses	7,920
Provision for credit losses for off-balance sheet credit exposure	3,206
Retained earnings	8,300
Cumulative Effect, Period of Adoption, Adjustment | Construction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Allowance for credit losses	$ 1,300

Allowance for Credit Losses o_3

Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for credit losses for off-balance sheet credit exposure	$ 8,900		$ 8,900		$ 0
Retained earnings	694,240		694,240			$ 695,273
Provision for credit losses	6,400	$ 500	32,017	$ 10,200
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
Retained earnings					8,300
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
Provision for credit losses	$ 575		$ 5,700

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) $ in Thousands	Sep. 30, 2020USD ($)security	Dec. 31, 2019USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted cash	$ 136,700	$ 77,000
Available for sale debt securities:	1,100,391	976,919
Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	934,171	947,430
Measured on a Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,100,391	976,919
Measured on a Recurring Basis | Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	934,171	947,430
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:	1,084	0
Quoted Prices in Active  Markets for Identical Assets (Level 1) | Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	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:	1,084	0
Quoted Prices in Active  Markets for Identical Assets (Level 1) | Measured on a Recurring Basis | Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,099,307	976,919
Significant Other Observable  Inputs (Level 2) | Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	934,171	947,430
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:	1,099,307	976,919
Significant Other Observable  Inputs (Level 2) | Measured on a Recurring Basis | Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	934,171	947,430
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Significant Unobservable Inputs (Level 3) | Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	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
Significant Unobservable Inputs (Level 3) | Measured on a Recurring Basis | Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	0	0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,100,391	976,919
Carrying Value | Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	934,171	947,430
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	1,100,391	976,919
Fair Value | Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	$ 934,171	$ 947,430
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	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	$ 1,100,391	$ 976,919
Equity securities	869	825
Derivative liabilities	135,500
Foreclosed assets	4,720	2,715
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:	1,084	0
Equity securities	869	825
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:	1,099,307	976,919
Equity securities	0	0
Derivative assets	117,722	39,305
Derivative liabilities	126,577	39,356
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:			$ 1,084
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:	934,171	947,430
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:	934,171	947,430
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:	53,868
Asset-backed securities | Significant Other Observable  Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	53,868
State And Municipal Obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	70,518	4,079
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:	70,518	4,079
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:	40,750	25,410
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:	40,750	25,410
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:	1,100,391	976,919
Equity securities	869	825
Derivative assets	117,722	39,305
Total assets at fair value	1,218,982	1,017,049
Derivative liabilities	126,577	39,356
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:	1,084	0
Equity securities	869	825
Derivative assets	0	0
Total assets at fair value	1,953	825
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:	1,099,307	976,919
Equity securities	0	0
Derivative assets	117,722	39,305
Total assets at fair value	1,217,029	1,016,224
Derivative liabilities	126,577	39,356
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:			1,084
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:			1,084
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:	934,171	947,430
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:	934,171	947,430
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:	53,868
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:	53,868
Measured on a Recurring Basis | State And Municipal Obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities:	70,518	4,079
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:	70,518	4,079
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:	40,750	25,410
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:	40,750	25,410
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	22,718	23,118
Loans measured for impairment based on the fair value of the underlying collateral	17,998	20,403
Foreclosed assets	4,720	2,715
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	22,718	23,118
Loans measured for impairment based on the fair value of the underlying collateral	17,998	20,403
Foreclosed assets	$ 4,720	$ 2,715

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2018
Financial assets:
Cash and cash equivalents	$ 510,138	$ 186,748
Available for sale debt securities, at fair value	1,100,391	976,919
Investment securities held to maturity, fair value	467,693	467,966
Federal Home Loan Bank stock	69,975	57,298
Equity securities	869	825
Loans, net of allowance for credit losses	9,650,495	7,277,360
Financial liabilities:
Certificates of deposit	1,144,688	734,027
Total deposits	9,559,241	7,102,609
Borrowed funds	1,413,029	1,125,146
Derivative liabilities	135,500
Quoted Prices in Active  Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	510,138	186,748
Available for sale debt securities, at fair value	1,084	0
Investment securities held to maturity, fair value	9,088	6,601
Federal Home Loan Bank stock	69,975	57,298
Equity securities	869	825
Loans, net of allowance for credit losses	0	0
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	8,414,553	6,368,582
Certificates of deposit	0	0
Total deposits	8,414,553	6,368,582
Borrowed funds	0	0
Subordinated debentures	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	1,099,307	976,919
Investment securities held to maturity, fair value	458,605	461,365
Federal Home Loan Bank stock	0	0
Equity securities	0	0
Loans, net of allowance for credit losses	0	0
Derivative assets	117,722	39,305
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	1,148,156	734,047
Total deposits	1,148,156	734,047
Borrowed funds	1,424,689	1,127,569
Subordinated debentures	24,050
Derivative liabilities	126,577	39,356
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
Loans, net of allowance for credit losses	9,917,269	7,296,744
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
Derivative liabilities	0	0
Agency Obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value			$ 1,084
Investment securities held to maturity, fair value	9,088	6,601
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	934,171	947,430
Investment securities held to maturity, fair value	77	122
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	934,171	947,430
Investment securities held to maturity, fair value	77	122
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	53,868
Asset-backed securities | Significant Other Observable  Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value	53,868
State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	70,518	4,079
Investment securities held to maturity, fair value	449,448	451,353
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	70,518	4,079
Investment securities held to maturity, fair value	449,448	451,353
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	40,750	25,410
Investment securities held to maturity, fair value	9,080	9,890
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	40,750	25,410
Investment securities held to maturity, fair value	9,080	9,890
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		186,748
Available for sale debt securities, at fair value	1,100,391	976,919
Investment securities held to maturity, fair value	446,591	453,629
Federal Home Loan Bank stock	69,975	57,298
Equity securities	869	825
Loans, net of allowance for credit losses	9,650,495	7,277,360
Derivative assets	117,722	39,305
Financial liabilities:
Deposits other than certificates of deposits	8,414,553	6,368,582
Certificates of deposit	1,144,688	734,027
Total deposits	9,559,241	7,102,609
Borrowed funds	1,413,029	1,125,146
Subordinated debentures	25,099
Derivative liabilities	126,577	39,356
Carrying Value | Agency Obligations
Financial assets:
Available for sale debt securities, at fair value			1,084
Investment securities held to maturity, fair value	9,100	6,599
Carrying Value | Mortgage-Backed Securities
Financial assets:
Available for sale debt securities, at fair value	934,171	947,430
Investment securities held to maturity, fair value	75	118
Carrying Value | Asset-backed securities
Financial assets:
Available for sale debt securities, at fair value	53,868
Carrying Value | State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	70,518	4,079
Investment securities held to maturity, fair value	428,465	437,074
Carrying Value | Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	40,750	25,410
Investment securities held to maturity, fair value	8,951	9,838
Fair Value
Financial assets:
Cash and cash equivalents	510,138	186,748
Available for sale debt securities, at fair value	1,100,391	976,919
Investment securities held to maturity, fair value	467,693	467,966
Federal Home Loan Bank stock	69,975	57,298
Equity securities	869	825
Loans, net of allowance for credit losses	9,917,269	7,296,744
Derivative assets	117,722	39,305
Financial liabilities:
Deposits other than certificates of deposits	8,414,553	6,368,582
Certificates of deposit	1,148,156	734,047
Total deposits	9,562,709	7,102,629
Borrowed funds	1,424,689	1,127,569
Subordinated debentures	24,050
Derivative liabilities	126,577	39,356
Fair Value | Agency Obligations
Financial assets:
Available for sale debt securities, at fair value			$ 1,084
Investment securities held to maturity, fair value	9,088	6,601
Fair Value | Mortgage-Backed Securities
Financial assets:
Available for sale debt securities, at fair value	934,171	947,430
Investment securities held to maturity, fair value	77	122
Fair Value | Asset-backed securities
Financial assets:
Available for sale debt securities, at fair value	53,868
Fair Value | State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	70,518	4,079
Investment securities held to maturity, fair value	449,448	451,353
Fair Value | Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	40,750	25,410
Investment securities held to maturity, fair value	$ 9,080	$ 9,890

Other Comprehensive Income (Com

Other Comprehensive Income (Components of OCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	$ (578)	$ 3,594	$ 20,733	$ 27,291
Reclassification adjustment for gains included in net income	0	0	0	0
Total	(578)	3,594	20,733	27,291
Unrealized losses on derivatives (cash flow hedges)	1,186	188	(8,242)	(1,119)
Amortization related to post-retirement obligations	115	48	322	78
Total other comprehensive income	723	3,830	12,813	26,250
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	150	(980)	(5,345)	(7,437)
Reclassification adjustment for gains included in net income	0	0	0	0
Total	150	(980)	(5,345)	(7,437)
Unrealized losses on derivatives (cash flow hedges)	(306)	(51)	2,125	306
Amortization related to post-retirement obligations	(30)	(13)	(83)	(21)
Total other comprehensive income	(186)	(1,044)	(3,303)	(7,152)
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	(428)	2,614	15,388	19,854
Reclassification adjustment for gains included in net income	0	0	0	0
Total	(428)	2,614	15,388	19,854
Unrealized gains on derivatives (cash flow hedges)	880	137	(6,117)	(813)
Amortization related to post-retirement obligations	85	35	239	57
Total other comprehensive income	$ 537	$ 2,786	$ 9,510	$ 19,098

Other Comprehensive Income (C_2

Other Comprehensive Income (Components of AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,410,407	$ 1,391,446	$ 1,413,840	$ 1,358,980
Current - period other comprehensive income	537	2,786	9,510	19,098
Reclassification of unrealized gains on equity securities due to the adoption of ASU No. 2016-01	1,410,407	1,397,833	1,413,840	1,358,980
Ending Balance	1,601,569	1,397,833	1,601,569	1,397,833
Unrealized Gains (Losses) on Available for Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	24,562	7,635	8,746	(9,605)
Current - period other comprehensive income	(428)	2,614	15,388	19,854
Reclassification of unrealized gains on equity securities due to the adoption of ASU No. 2016-01	24,134	10,249	8,746	(9,605)
Ending Balance	24,134	10,249	24,134	10,249
Post- Retirement Obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(5,086)	(3,603)	(5,240)	(3,625)
Current - period other comprehensive income	85	35	239	57
Reclassification of unrealized gains on equity securities due to the adoption of ASU No. 2016-01	(5,001)	(3,568)	(5,001)	(3,568)
Ending Balance	(5,001)	(3,568)	(5,001)	(3,568)
Unrealized (Losses) Gains on Derivatives (cash flow hedges)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,682)	(56)	315	894
Current - period other comprehensive income	880	137	(6,117)	(813)
Reclassification of unrealized gains on equity securities due to the adoption of ASU No. 2016-01	(5,802)	81	(5,802)	81
Ending Balance	(5,802)	81	(5,802)	81
Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	12,794	3,976	3,821	(12,336)
Current - period other comprehensive income	537	2,786	9,510	19,098
Reclassification of unrealized gains on equity securities due to the adoption of ASU No. 2016-01	13,331	6,762	13,331	6,762
Ending Balance	$ 13,331	$ 6,762	$ 13,331	$ 6,762

Other Comprehensive Income (Rec

Other Comprehensive Income (Reclassifications Out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Compensation and employee benefits	$ 35,700	$ 29,376	$ 96,095	$ 86,735
Income tax expense	9,285	9,938	18,257	26,429
Net income	(27,143)	(31,399)	(56,384)	(86,682)
Reclassification adjustment | Post-retirement obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Compensation and employee benefits	112	48	336	142
Income tax expense	(27)	(13)	(97)	(39)
Net income	$ 85	$ 35	$ 239	$ 103

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)counterpartyinstrument	Dec. 31, 2019USD ($)instrument
Derivative [Line Items]
Derivative instruments in accumulated other comprehensive income reclassified to interest expense	$ 3,500
Derivative liability, notional amount	$ 640,000
Number of counterparties | counterparty	4
Counterparty in liability position | counterparty	4
Derivative liabilities	$ 135,500
Collateral against obligations	136,100
Derivatives Not Designated as a Hedging Instruments
Derivative [Line Items]
Credit derivatives, fair value	$ 540	$ 47
Derivatives Not Designated as a Hedging Instruments | Interest rate products
Derivative [Line Items]
Number of derivative instruments held (in instrument) | instrument	158	92
Derivative notional amount	$ 2,440,000	$ 1,610,000
Derivatives Not Designated as a Hedging Instruments | Credit contracts
Derivative [Line Items]
Number of derivative instruments held (in instrument) | instrument	13
Derivative notional amount	$ 111,800	$ 106,000
Amount of collateral	$ 650
Designated as Hedging Instrument
Derivative [Line Items]
Number of outstanding derivatives | instrument	15

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities (Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivatives Not Designated as a Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 125,535	$ 38,877
Liability derivatives	126,577	39,356
Derivatives Not Designated as a Hedging Instruments | Other Assets | Interest rate products
Derivatives, Fair Value [Line Items]
Asset derivatives	124,995	38,830
Derivatives Not Designated as a Hedging Instruments | Other Assets | Credit contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	540	47
Derivatives Not Designated as a Hedging Instruments | Other Liabilities | Interest rate products
Derivatives, Fair Value [Line Items]
Liability derivatives	126,577	39,356
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	0	428
Liability derivatives	7,813	0
Designated as Hedging Instrument | Other Assets | Interest rate products
Derivatives, Fair Value [Line Items]
Asset derivatives	0	428
Designated as Hedging Instrument | Other Liabilities | Interest rate products
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 7,813	$ 0

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivatives Not Designated as a Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	$ 486	$ 2,236	$ (563)	$ 156
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	26	2,307	(1,022)	212
Derivatives Not Designated as a Hedging Instruments | Credit contracts | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	460	(71)	459	(56)
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	855	157	875	466
Designated as Hedging Instrument | Interest rate products | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	$ 855	$ 157	$ 875	$ 466

Revenue Recognition (Summary of

Revenue Recognition (Summary of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Percentage of total revenue excluded from adoption of 606	81.90%	85.80%	83.50%	87.00%
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 12,724	$ 10,944	$ 32,473	$ 30,530
Total out-of-scope non-interest income	7,902	7,103	19,509	15,539
Total non-interest income	20,626	18,047	51,982	46,069
Wealth management fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6,847	6,084	19,075	16,406
Insurance agency income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,711	0	1,711	0
Banking service charges and other fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4,166	4,860	11,687	14,124
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,473	3,386	7,520	9,853
Debit card and ATM fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 1,693	$ 1,474	$ 4,167	$ 4,271

Leases (Additional Information)

Leases (Additional Information) (Detail) - USD ($) $ in Thousands	Jan. 01, 2019	Sep. 30, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 44,900	$ 41,709	$ 41,754
Operating lease liabilities	46,100	$ 42,654	$ 42,815
Deferred gains associated with sale and leaseback transactions	$ 5,900
Weighted-average remaining lease term		9 years
Weighted-average discount rate		3.25%
T&L [Member]
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets		$ 3,800

Leases (Supplemental Balance Sh

Leases (Supplemental Balance Sheet Information) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 41,709	$ 41,754	$ 44,900
Operating lease liabilities	$ 42,654	$ 42,815	$ 46,100
Operating lease, liability, statement of financial position [Extensible List]	us-gaap:OtherLiabilities
Operating lease, right-of-use asset, statement of financial position [Extensible List]	us-gaap:OtherAssets

Leases (Supplemental Cash Flow

Leases (Supplemental Cash Flow and Lease Cost Information) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash Flow, Operating Activities, Lessee [Abstract]
Operating lease cost	$ 2,303	$ 2,127	$ 6,565	$ 6,303
Variable lease cost	754	727	2,085	2,083
Total Lease Cost	$ 3,057	$ 2,854	8,650	8,386
Operating cash flows from operating leases			$ 6,528	$ 6,179

Leases (Future Minimum Payments

Leases (Future Minimum Payments) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Remainder of 2020	$ 2,322
2021	7,018
2022	6,137
2023	5,622
2024	5,219
Thereafter	23,584
Total future minimum lease payments	49,902
Amounts representing interest	7,248
Present value of net future minimum lease payments	$ 42,654	$ 42,815	$ 46,100