Sterling Bancorp (STL) 10-Q 30 Apr 21 2021 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Mar. 31, 2021	Apr. 28, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-35385
Entity Registrant Name	STERLING BANCORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	80-0091851
Entity Address, Address Line One	Two Blue Hill Plaza
Entity Address, Address Line Two	2nd Floor
Entity Address, City or Town	Pearl River,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10965
City Area Code	845
Local Phone Number	369-8040
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Smaller Reporting Company	false
Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		192,599,296
Entity Central Index Key	0001070154
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Stock, Par Value $0.01 Per Share
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	STL
Security Exchange Name	NYSE
Depositary Shares, Each Representing 1/40th Interest In A Share Of 6.50% Non-Cumulative Perpetual Preferred Stock, Series A
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing 1/40 interest in a share of 6.50% Non-Cumulative Perpetual Preferred Stock, Series A
Trading Symbol	STLPRA
Security Exchange Name	NYSE

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS:
Cash and due from banks	$ 935,633	$ 305,002
Securities available for sale, at estimated fair value	2,524,671	2,298,618
Securities held to maturity (“HTM”), net of allowance for credit losses of $1,499 at March 31, 2021 and December 31, 2020	1,716,786	1,740,838
Loans held for sale	36,237	11,749
Portfolio loans	21,151,973	21,848,409
Allowance for credit losses - loans	(323,186)	(326,100)
Portfolio loans, net	20,828,787	21,522,309
Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank (“FRB”) stock, at cost	153,968	166,190
Accrued interest receivable	103,323	97,505
Premises and equipment, net	199,782	202,555
Goodwill	1,683,482	1,683,482
Other intangible assets, net	89,788	93,564
Bank owned life insurance (“BOLI”)	630,430	629,576
Other real estate owned	5,227	5,347
Other assets	1,006,168	1,063,403
Total assets	29,914,282	29,820,138
LIABILITIES:
Deposits	23,841,718	23,119,522
FHLB and other borrowings	0	382,000
Federal Funds Purchased	0	277,000
Repurchase agreements	31,679	27,101
Mortgage escrow funds	82,245	59,686
Other liabilities	702,656	728,702
Total liabilities	25,294,118	25,229,624
Commitments and Contingent liabilities (See Note 14. “Commitments and Contingencies”)
STOCKHOLDERS’ EQUITY:
Preferred stock (par value $0.01 per share; 10,000,000 shares authorized; 135,000 shares issued and outstanding at March 31, 2021 and December 31, 2020)	136,458	136,689
Common stock (par value $0.01 per share; 310,000,000 shares authorized at March 31, 2021 and December 31, 2020; 229,872,925 shares issued at March 31, 2021 and December 31, 2020; 192,567,901 and 192,923,371 shares outstanding at March 31, 2021 and December 31, 2020, respectively)	2,299	2,299
Additional paid-in capital	3,745,890	3,761,993
Treasury stock, at cost (37,305,024 shares at March 31, 2021 and 36,949,554 shares at December 31, 2020)	(699,415)	(686,911)
Retained earnings	1,377,341	1,291,628
Accumulated other comprehensive income, net of tax expense of $21,999 at March 31, 2021 and $32,399 at December 31, 2020	57,591	84,816
Total stockholders’ equity	4,620,164	4,590,514
Total liabilities and stockholders’ equity	29,914,282	29,820,138
Sterling National Bank
LIABILITIES:
Subordinated Notes	143,757	143,703
Sterling Bancorp
LIABILITIES:
Subordinated Notes	$ 492,063	$ 491,910

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Debt securities, held-to-maturity, allowance for credit loss	$ 1,499	$ 1,499
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	135,000	135,000
Preferred stock, shares outstanding (in shares)	135,000	135,000
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	310,000,000	310,000,000
Common stock, shares issued (in shares)	229,872,925	229,872,925
Common stock, shares outstanding (in shares)	192,567,901	192,923,371
Treasury stock, shares (in shares)	37,305,024	36,949,554
Accumulated other comprehensive loss, tax expense (benefit)	$ 21,999	$ 32,399

Consolidated Income Statements

Consolidated Income Statements (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest and dividend income:
Loans and loan fees	$ 205,855	$ 235,439
Securities taxable	15,352	20,629
Securities non-taxable	11,738	12,997
Other earning assets	902	4,462
Total interest and dividend income	233,847	273,527
Interest expense:
Deposits	8,868	45,781
Borrowings	7,065	15,974
Total interest expense	15,933	61,755
Net interest income	217,914	211,772
Provision for credit losses - loans	10,000	136,577
Provision for credit losses - held to maturity securities	0	1,703
Net interest income after provision for credit losses	207,914	73,492
Non-interest income:
Deposit fees and service charges	6,563	6,622
Accounts receivable management / factoring commissions and fees	5,426	5,538
Bank owned life insurance	4,955	5,018
Loan commissions and fees	10,477	11,024
Investment management fees	1,852	1,847
Net gain on sale of securities	719	8,412
Net gain on called securities	0	4,880
Other	2,364	3,985
Total non-interest income	32,356	47,326
Non-interest expense:
Compensation and benefits	58,087	54,876
Stock-based compensation plans	6,617	6,006
Occupancy and office operations	14,515	15,199
Information technology	9,246	8,018
Professional fees	7,077	5,749
Amortization of intangible assets	3,776	4,200
FDIC insurance and regulatory assessments	3,230	3,206
Other real estate owned expense, net	(68)	52
Impairment related to financial centers and real estate consolidation strategy	633	0
Loss on extinguishment of borrowings	0	744
Other	15,052	16,663
Total non-interest expense	118,165	114,713
Income before income tax expense (benefit)	122,105	6,105
Income tax expense (benefit)	22,955	(8,042)
Net income	99,150	14,147
Preferred stock dividend	1,963	1,976
Net income available to common stockholders	$ 97,187	$ 12,171
Weighted average common shares:
Basic (in shares)	191,890,512	196,344,061
Diluted (in shares)	192,621,907	196,709,038
Earnings per common share:
Basic (USD per share)	$ 0.51	$ 0.06
Diluted (USD per share)	$ 0.50	$ 0.06

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 99,150	$ 14,147
Other comprehensive income, before tax:
Change in unrealized holding (losses) gains on securities available for sale	(33,926)	48,755
Reclassification adjustment for net realized (gains) included in net income	(719)	(8,412)
Accretion of net unrealized loss on securities transferred to held to maturity	45	97
Change in the actuarial loss of defined benefit plan and post-retirement benefit plans	(3,025)	(2,568)
Total other comprehensive (loss) income, before tax	(37,625)	37,872
Deferred tax benefit (expense) related to other comprehensive income	10,400	(10,467)
Total other comprehensive (loss) income	(27,225)	27,405
Comprehensive income	$ 71,925	$ 41,552

Consolidated Statement of Chang

Consolidated Statement of Changes In Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common stock	Common stockCumulative Effect, Period of Adoption, Adjusted Balance	Preferred stock	Preferred stockCumulative Effect, Period of Adoption, Adjusted Balance	Additional paid-in capital	Additional paid-in capitalCumulative Effect, Period of Adoption, Adjusted Balance	Treasury stock	Treasury stockCumulative Effect, Period of Adoption, Adjusted Balance	Retained earnings	Retained earningsCumulative Effect, Period of Adoption, Adjustment	Retained earningsCumulative Effect, Period of Adoption, Adjusted Balance	Accumulated other comprehensive income	Accumulated other comprehensive incomeCumulative Effect, Period of Adoption, Adjusted Balance
Balance (in shares) at Dec. 31, 2019				198,455,324	198,455,324
Balance, beginning at Dec. 31, 2019	$ 4,530,113	$ (54,254)	$ 4,475,859	$ 2,299	$ 2,299	$ 137,581	$ 137,581	$ 3,766,716	$ 3,766,716	$ (583,408)	$ (583,408)	$ 1,166,709	$ (54,254)	$ 1,112,455	$ 40,216	$ 40,216
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,147											14,147
Other comprehensive income (loss)	27,405														27,405
Stock options & other stock transactions, net (in shares)				41,000
Stock options & other stock transactions, net	414									346		68
Common shares acquired from stock compensation plan activity (in shares)				(316,582)
Common shares acquired from stock compensation plan activity	(4,413)							(24,516)		5,916		14,187
Stock-based Compensation (in shares)				1,181,673
Stock-based compensation	6,006							7,308		(1,891)		589
Cash dividends declared, common	(13,768)											(13,768)
Cash dividends declared, preferred	(2,194)					(218)						(1,976)
Purchase of treasury stock (in shares)				(4,900,759)
Purchase of treasury stock	(81,032)									(81,032)
Balance (in shares) at Mar. 31, 2020				194,460,656
Balance, ending at Mar. 31, 2020	4,422,424			$ 2,299		137,363		3,749,508		(660,069)		1,125,702			67,621
Balance (in shares) at Dec. 31, 2020				192,923,371
Balance, beginning at Dec. 31, 2020	4,590,514			$ 2,299		136,689		3,761,993		(686,911)		1,291,628			84,816
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	99,150											99,150
Other comprehensive income (loss)	(27,225)														(27,225)
Stock options & other stock transactions, net (in shares)				73,946
Stock options & other stock transactions, net	752									1,376		(624)
Common shares acquired from stock compensation plan activity (in shares)				(332,290)
Common shares acquired from stock compensation plan activity	(6,635)							(23,241)		13,860		2,746
Stock-based Compensation (in shares)				1,138,246
Stock-based compensation	6,617							7,138		(415)		(106)
Cash dividends declared, common	(13,490)											(13,490)
Cash dividends declared, preferred	(2,194)					(231)						(1,963)
Purchase of treasury stock (in shares)				(1,235,372)
Purchase of treasury stock	(27,325)									(27,325)
Balance (in shares) at Mar. 31, 2021				192,567,901
Balance, ending at Mar. 31, 2021	$ 4,620,164			$ 2,299		$ 136,458		$ 3,745,890		$ (699,415)		$ 1,377,341			$ 57,591

Consolidated Statement of Cha_2

Consolidated Statement of Changes In Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends paid, common (usd per share)	$ 0.07	$ 0.07
Cash dividends paid, preferred (usd per share)	$ 16.25	$ 16.25

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 99,150	$ 14,147
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses - loans	10,000	136,577
Provision for credit losses - held to maturity securities	0	1,703
Net (gain) from write-downs and sales of other real estate owned	(2)	(62)
Loss on extinguishment of borrowings	0	744
Depreciation of premises and equipment	4,576	5,034
Impairment on fixed assets	197	0
Impairment of early termination of leases	127	0
Amortization of intangible assets	3,776	4,200
Loss on sale of premises and equipment	309	0
Amortization of low income housing tax credits	11,507	7,401
Net (gain) on sale of securities	(706)	(8,412)
(Gain) on security calls available for sale	(18)	(4,897)
Loss on security calls held to maturity	5	17
Net amortization of premiums on securities	7,601	7,978
Amortization of premium on certificates of deposit	(286)	(692)
Net accretion of purchase discount and amortization of net deferred loan costs	(7,972)	(10,385)
Net accretion of debt issuance costs and amortization of premium on borrowings	207	(144)
Restricted stock compensation expense	6,617	6,006
Proceeds from sales of loans held for sale	81,752	1
Increase in cash surrender value of bank owned life insurance	(4,955)	(5,018)
Deferred income tax benefit	(10,888)	(60,653)
Other adjustments (principally net changes in other assets and other liabilities)	41,331	(86,627)
Net cash provided by operating activities	242,328	6,919
Purchases of securities:
Available for sale	(419,386)	(124,408)
Held to maturity	(652)	(882)
Proceeds from maturities and other principal payments on securities:
Available for sale	134,901	64,600
Held to maturity	17,953	17,343
Proceeds from sales of securities available for sale	20,706	407,524
Proceeds from calls of securities available for sale	2,025	138,872
Proceeds from calls of securities held to maturity	925	905
Portfolio loan repayments (originations), net	585,254	(339,730)
Proceeds from sale of commercial loans	0	95,179
Redemptions of FHLB and FRB stock, net	12,222	11,083
Proceeds from sales of other real estate owned	122	1,168
Purchases of premises and equipment	(5,588)	(8,374)
Proceeds from bank owned life insurance	4,101	2,218
Proceeds from sale of premises and equipment	3,279	1,884
Purchases of low income housing tax credits	(9,286)	(45,196)
Net cash provided by investing activities	346,576	222,186
Cash flows from financing activities:
Net increase in transaction, savings and money market deposits	961,084	628,101
Net (decrease) in certificates of deposit	(238,602)	(487,787)
Net (decrease) in short-term FHLB borrowings	(382,000)	(40,000)
Advances of term FHLB borrowings	0	300,000
Repayments of term FHLB borrowings	0	(550,000)
Repayment of Senior Notes	0	(2,000)
Net (decrease) increase in other short term borrowings	(272,422)	4,884
Net increase in mortgage escrow funds	22,559	38,175
Stock options & other stock transactions, net	752	414
Common shares acquired related to stock compensation plan activity	(6,635)	(4,413)
Treasury shares repurchased	(27,325)	(81,032)
Cash dividends paid - common stock	(13,490)	(13,768)
Cash dividends paid - preferred stock	(2,194)	(2,194)
Net cash provided by (used in) financing activities	41,727	(209,620)
Net increase in cash and cash equivalents	630,631	19,485
Cash and cash equivalents at beginning of period	305,002	329,151
Cash and cash equivalents at end of period	935,633	348,636
Supplemental cash flow information:
Interest payments	9,595	58,803
Income tax payments	5,316	5,678
Real estate acquired in settlement of loans	0	732
Loans transferred from held for investment to held for sale	106,240	95,179
Operating cash flows from operating leases	3,928	5,109
Senior Notes
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on extinguishment of borrowings	0	(8)
FHLB Borrowings
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on extinguishment of borrowings	$ 0	$ 753

Basis of Financial Statement Pr

Basis of Financial Statement Presentation and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Financial Statement Presentation and Summary of Significant Accounting Policies	Basis of Financial Statement Presentation and Summary of Significant Accounting Policies (a) Nature of Operations Sterling Bancorp (“Sterling”, the “Company,” “we,” “us” and “our” ) is a Delaware corporation, a bank holding company and a financial holding company headquartered in Pearl River, New York that owns all of the outstanding shares of common stock of Sterling National Bank (the “Bank”), its principal subsidiary. The Bank is a full-service regional bank specializing in the delivery of services and solutions to business owners, their families and consumers within the communities it serves through teams of dedicated and experienced relationship managers. (b) Basis of Presentation The consolidated financial statements in this Quarterly Report on Form 10-Q include the accounts of the Company and all other entities in which the Company has a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation. The accounting and financial reporting policies the Company follows conform, in all material respects, to accounting principles generally accepted in the United States (“GAAP”) and to general practices within the banking industry, which include regulatory reporting instructions. The consolidated financial statements in this Quarterly Report on Form 10-Q have not been audited by an independent registered public accounting firm, but, in the opinion of management, reflect all adjustments necessary for a fair presentation of our financial position and results of operations. All such adjustments were of a normal and recurring nature. The consolidated financial statements have been prepared in accordance with GAAP and with the instructions to Form 10-Q adopted by the Securities and Exchange Commission (the “SEC”). Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2020, included in our Annual Report on Form 10-K, as filed with the SEC on February 26, 2021 (the “2020 Form 10-K”). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. Certain items in prior financial statements have been reclassified to conform to the current presentation. These reclassifications had no impact on previously reported net income. (c) Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, income, expense and contingencies at the date of the financial statements. Actual results could differ significantly from these estimates, particularly the allowance for credit losses and the status of contingencies, and are subject to change. (d) Announcement of Definitive Merger Agreement On April 19, 2021, Webster Financial Corporation (NYSE: WBS) (“Webster”), the parent company of Webster Bank, National Association, and Sterling, the parent company of the Bank, jointly announced that they have entered into a definitive agreement under which the companies will combine in an all stock merger of equals. See Note 18. “Subsequent Events” for further information. (e) Risks and Uncertainties - COVID-19 The COVID-19 pandemic and the resultant deterioration in global macro-economic conditions has continued to impact our business and our clients. While significant progress is being made in the U.S. in connection with vaccine distribution efforts and the macro-economic forecasts are generally more positive, some uncertainty continues to exist regarding the speed of the economic recovery, especially in the NY Metro Market area, and the ultimate impact on our business, financial position, results of operations and cash flows will depend on future developments, which are uncertain and cannot be predicted, including, but not limited to, the scope and duration of the pandemic globally, the actions that will be taken by governmental authorities to both contain the outbreak and to provide continuing support to affected businesses through additional stimulus funds and otherwise, the speed and efficiency of the vaccine roll out in New York state and elsewhere, and the ongoing response of, and impact to, our clients and business partners. The COVID-19 pandemic negatively impacted the global economy, causing businesses to shut down and unemployment rates to increase, disrupted global supply chains and created significant volatility and disruption in financial markets. In response to the pandemic, governmental and other authorities instituted numerous measures to contain the virus including travel bans, shelter-in-place orders and business shutdowns. Our business, financial position, results of operations and cash flows have been and will be impacted by factors which include, but are not limited to: a continued dampened demand for our products and services, a prolonged period of low or near zero interest rates, a potential further deterioration in the financial condition of our clients resulting in an increase in our allowance for credit losses and the recognition of further credit losses, and a prolonged deterioration of business conditions in our primary markets, particularly the New York Metro Market and the New York Suburban Market. Some of our clients continue to face a very challenging business environment. The current economic conditions, especially if prolonged, could negatively impact the stability of our deposit base, impair the ability of borrowers to repay outstanding loans, cause an increase in the number of non-performing loans, impair the value of collateral securing loans, and cause significant property damage, all of which could negatively impact our operating results and financial condition. The pandemic resulted in a significant increase in our allowance for credit losses (“ACL”) - loans to $323.2 million or 1.53% of total portfolio loans recorded at March 31, 2021 versus $106.2 million or 0.50% at December 31, 2019. During the year ended December 31, 2020, approximately $165.0 million of the $251.7 million of provision for credit loss expense was recorded as a result of changes in the macro-economic assumptions in our forecast model resulting from the COVID-19 pandemic. While the improving macro-economic forecast drove a lower quarter over linked quarter estimate for the ACL at March 31, 2021, in light of continued, though slowing, credit migration in our portfolio, we have continued to take a measured and conservative approach to reserve releases and recorded an ACL as of March 31, 2021 that was roughly flat versus December 31, 2020. At March 31, 2021, loans criticized as special mention were $494.5 million and classified loans (substandard and doubtful) were $590.1 million. The collateral for these loans is mainly located in the New York Metro Market and includes office, retail, hotel and multi-family properties. At March 31, 2021, we had $130.5 million of loan payment deferral agreements with borrowers, down from $208.4 million at December 31, 2020. The New York Metro Market and the New York Suburban Market have been particularly impacted by COVID-19, resulting in prolonged periods of business interruption, heightened levels of unemployment caused by business closures, temporary and permanent, and a significant decline in demand for commercial real estate. This has had the effect of negatively impacting the net operating income of some of our commercial real estate borrowers as well as the value of collateral underlying our commercial real estate loan portfolio. As such, given our business concentration in the New York Metro Market and the New York Suburban Market, our results may be disproportionately impacted when compared to the results and financial condition of other banks or bank holding companies that do not operate in or have a geographic concentration in the New York Metro Market or the New York Suburban Market. To the extent the COVID-19 pandemic adversely affects our business, financial position, results of operations and/or cash flows, it may also have the effect of heightening many of the other risks we face, including the other risks described in our Annual Report on Form 10-K for the year ended December 31, 2020, filed on February 26, 2021.

Securities

Securities	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The following table summarizes our securities as of March 31, 2021, including a summary of the amortized cost fair value and allowance for credit losses related to HTM securities and the amortized cost, fair value of AFS securities. The terms “MBS” refers to mortgage-backed securities and the term “CMOs” refers to collateralized mortgage obligations. Both of these terms are further defined in Note 15. “Fair Value Measurements”: March 31, 2021 Available for Sale Held to Maturity Amortized Gross Gross Fair Amortized Gross Gross Fair Allowance for credit losses Residential MBS: Agency-backed $ 832,665 $ 33,917 $ (1,789) $ 864,793 $ 87,645 $ 3,013 $ — $ 90,658 $ — CMOs/Other MBS 302,349 12,403 — 314,752 — — — — — Total residential MBS 1,135,014 46,320 (1,789) 1,179,545 87,645 3,013 — 90,658 — Other securities: US Treasury and federal agencies 340,074 4,898 (1,500) 343,472 24,844 687 — 25,531 — Corporate 594,845 25,200 (7,121) 612,924 19,837 868 — 20,705 80 State and municipal 373,860 15,232 (362) 388,730 1,568,209 103,435 (58) 1,671,586 1,374 Other — — — — 17,750 173 (171) 17,752 45 Total other securities 1,308,779 45,330 (8,983) 1,345,126 1,630,640 105,163 (229) 1,735,574 1,499 Total securities $ 2,443,793 $ 91,650 $ (10,772) $ 2,524,671 $ 1,718,285 $ 108,176 $ (229) $ 1,826,232 $ 1,499 A summary of amortized cost and estimated fair value of securities as of December 31, 2020 is presented below: December 31, 2020 Available for Sale Held to Maturity Amortized Gross Gross Fair Amortized Gross Gross Fair Allowance for credit losses Residential MBS: Agency-backed $ 873,358 $ 44,911 $ (9) $ 918,260 $ 104,329 $ 4,100 $ — $ 108,429 $ — CMOs/Other MBS 352,473 20,811 — 373,284 — — — — — Total residential MBS 1,225,831 65,722 (9) 1,291,544 104,329 4,100 — 108,429 — Other securities: Federal agencies 149,852 6,615 — 156,467 24,811 844 — 25,655 — Corporate 438,226 27,334 (2,048) 463,512 19,851 535 — 20,386 75 State and municipal 369,186 18,090 (181) 387,095 1,575,596 126,575 (69) 1,702,102 1,379 Other — — — — 17,750 189 (7) 17,932 45 Total other securities 957,264 52,039 (2,229) 1,007,074 1,638,008 128,143 (76) 1,766,075 1,499 Total securities $ 2,183,095 $ 117,761 $ (2,238) $ 2,298,618 $ 1,742,337 $ 132,243 $ (76) $ 1,874,504 $ 1,499 The amortized cost and estimated fair value of securities at March 31, 2021 are presented below by contractual maturity. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Residential MBS are shown separately since they are not due at a single maturity date. March 31, 2021 Available for sale Held to maturity Amortized Fair Amortized Fair Remaining period to contractual maturity: One year or less $ 1,930 $ 1,929 $ 23,767 $ 24,114 One to five years 321,730 332,513 84,722 88,811 Five to ten years 603,636 624,601 392,685 417,633 Greater than ten years 381,483 386,083 1,129,466 1,205,016 Total securities with a stated maturity date 1,308,779 1,345,126 1,630,640 1,735,574 Residential MBS 1,135,014 1,179,545 87,645 90,658 Total securities $ 2,443,793 $ 2,524,671 $ 1,718,285 $ 1,826,232 Sales and calls of securities for the periods indicated below were as follows: For the three months ended March 31, 2021 2020 Available for sale: Proceeds from sales $ 20,706 $ 407,524 Gross realized gains 1,236 8,480 Gross realized losses (530) (68) Income tax expense on realized net gains 131 1,472 Proceeds from calls $ 2,950 $ 139,777 Gross realized gains 31 4,909 Gross realized losses (18) (29) Income tax expense on realized net gains 2 854 At March 31, 2021 and December 31, 2020, there were no holdings of securities of any one issuer in an amount greater than 10% of stockholders’ equity, other than the U.S. federal government and its agencies. The following table summarizes AFS securities with unrealized losses in an unrealized loss position for which an ACL has not been recorded at March 31, 2021 and December 31, 2020 aggregated by major security type and length of time in a continuous unrealized loss position: Continuous unrealized loss position Less than 12 months 12 months or longer Total Fair Unrealized losses Fair Unrealized losses Fair Unrealized losses AFS March 31, 2021 Residential MBS: Agency-backed $ 48,576 $ (1,781) $ 276 $ (8) $ 48,852 $ (1,789) Other securities: US Treasury and federal agencies 208,506 (1,500) — — 208,506 (1,500) Corporate 187,172 (7,121) — — 187,172 (7,121) State and municipal 24,361 (195) 10,706 (167) 35,067 (362) Total other securities 420,039 (8,816) 10,706 (167) 430,745 (8,983) Total securities $ 468,615 $ (10,597) $ 10,982 $ (175) $ 479,597 $ (10,772) December 31, 2020 Residential MBS: Agency-backed $ 396 $ (1) $ 1,970 $ (8) $ 2,366 $ (9) Other securities: Corporate 83,191 (2,048) — — 83,191 (2,048) State and municipal 2,507 (29) 10,872 (152) 13,379 (181) Total other securities 85,698 (2,077) 10,872 (152) 96,570 (2,229) Total securities $ 86,094 $ (2,078) $ 12,842 $ (160) $ 98,936 $ (2,238) We regularly review AFS securities for impairment resulting from credit losses using both qualitative and quantitative criteria based on the composition of the portfolio at each reporting period. Unrealized losses on corporate and state and municipal securities have not been recognized into income because the issuers are of high credit quality, we do not intend to sell and it is likely that we will not be required to sell the securities prior to their anticipated recovery. The decline in fair value is largely due to changes in interest rates and other market conditions. The issuers continue to make timely principal and interest payments on the securities. The fair value is expected to recover as the securities approach maturity. At March 31, 2021, a total of 59 AFS securities were in a continuous unrealized loss position for less than 12 months and 56 AFS securities were in a continuous unrealized loss position for 12 months or longer. At March 31, 2021 and December 31, 2020, accrued interest receivable on AFS securities was $14.9 million and $10.9 million, respectively. Accrued interest receivable on AFS securities is included in accrued interest receivable on the consolidated balance sheets. The following table summarizes securities HTM with unrecognized losses, segregated by the length of time in a continuous unrecognized loss position for the periods presented below: Continuous unrecognized loss position Less than 12 months 12 months or longer Total Fair Unrecognized losses Fair Unrecognized losses Fair Unrecognized losses HTM March 31, 2021 Other securities: State and municipal $ — $ — $ 3,910 $ (58) $ 3,910 $ (58) Other 4,829 (171) — — 4,829 (171) Total securities $ 4,829 $ (171) $ 3,910 $ (58) $ 8,739 $ (229) December 31, 2020 Residential MBS: Agency-backed $ — $ — $ — $ — $ — $ — Other securities: State and municipal 105 (1) 4,386 (68) 4,491 (69) Other 9,993 (7) — — 9,993 (7) Total other securities 10,098 (8) 4,386 (68) 14,484 (76) Total securities $ 10,098 $ (8) $ 4,386 $ (68) $ 14,484 $ (76) The following table presents the activity in the ACL - HTM securities by type of security for the three month periods ended March 31, 2021 and 2020: March 31, 2021 March 31, 2020 Type of security Type of security Corporate and Other State and municipal Corporate and Other State and municipal ACL - HTM: Balance at beginning of period $ 120 $ 1,379 $ — $ — Impact of adoption on January 1, 2020 — — 108 688 Provision for credit loss expense 5 (5) 7 1,696 Total ACL - HTM at end of period $ 125 $ 1,374 $ 115 $ 2,384 The ACL - HTM securities was estimated using a discounted cash flow approach. We discounted the expected cash flows using the effective interest rate inherent in the security. For floating rate securities, we projected interest rates using forward interest rate curves. We review the term structures for probability of default, probability of prepayment and loss given default. We estimate a reasonable and supportable term of three years, which was supported by our back testing process. At March 31, 2021 and December 31, 2020, accrued interest receivable on HTM securities was $18.1 million and $15.6 million, respectively, and was excluded from the estimate of ACL-HTM securities. Accrued interest receivable on HTM securities is included in accrued interest receivable on the consolidated balance sheets. Credit Quality Indicators We monitor the credit quality of HTM investment securities through the use of credit ratings, internal reviews and analysis of financial information and other data, and external reviews from a third-party vendor. We monitor credit quality indicators at least quarterly, and all credit ratings were updated and reviewed as of March 31, 2021. At March 31, 2021, one HTM security was in a continuous unrealized loss position for less than 12 months and 26 HTM securities were in a continuous unrealized loss position for 12 months or longer. The following table summarizes the amortized cost of HTM securities at March 31, 2021 aggregated by credit quality indicator: Credit Rating: Corporate and other State and municipal AAA $ — $ 991,273 AA 17,750 550,395 A — 20,522 BBB — 64 Non-rated 19,837 5,955 Total $ 37,587 $ 1,568,209 The majority of state and municipal securities had a rating of A or greater at March 31, 2021. State and municipal securities consist mainly of securities issued by jurisdictions located in the state of New York and securities issued by other states. The non-rated state and municipal securities consist of general obligation securities and short-term bond anticipation notes and tax anticipation notes issued by municipalities in the state of New York. A security is considered to be delinquent once it is 30 days past due under the terms of the agreement. There were no past due securities and there were no securities on non-accrual at March 31, 2021. Securities pledged for borrowings at the FHLB and other institutions, and securities pledged for municipal deposits and other purposes, were as follows for the periods presented below: March 31, December 31, 2021 2020 AFS securities pledged for borrowings, at fair value $ 31,679 $ 27,101 AFS securities pledged for municipal deposits, at fair value 611,646 569,724 HTM securities pledged for municipal deposits, at amortized cost 1,512,763 1,221,964 Total securities pledged $ 2,156,088 $ 1,818,789

Portfolio Loans

Portfolio Loans	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Portfolio Loans	Portfolio Loans The composition of our total portfolio loans, which excludes loans held for sale, was the following for the periods presented below: March 31, 2021 December 31, 2020 Commercial: Commercial & Industrial (“C&I”): Traditional C&I $ 2,886,336 $ 2,920,205 Asset-based lending 693,015 803,004 Payroll finance 153,987 159,237 Warehouse lending 1,394,945 1,953,677 Factored receivables 229,629 220,217 Equipment financing 1,475,716 1,531,109 Public sector finance 1,617,986 1,572,819 Total C&I 8,451,614 9,160,268 Commercial mortgage: Commercial real estate (“CRE”) 6,029,282 5,831,990 Multi-family 4,391,850 4,406,660 Acquisition, development and construction (“ADC”) 618,295 642,943 Total commercial mortgage 11,039,427 10,881,593 Total commercial 19,491,041 20,041,861 Residential mortgage 1,486,597 1,616,641 Consumer 174,335 189,907 Total portfolio loans 21,151,973 21,848,409 Allowance for credit losses (323,186) (326,100) Total portfolio loans, net $ 20,828,787 $ 21,522,309 Portfolio loans are shown at amortized cost, which includes deferred fees, deferred costs and purchase accounting adjustments, which were $12.9 million at March 31, 2021 and $20.9 million at December 31, 2020. The balance of portfolio loans excludes accrued interest receivable. Accrued interest receivable was $70.3 million and $71.0 million at March 31, 2021 and December 31, 2020, respectively, and was reported in accrued interest receivable on the consolidated balance sheets. Interest income is accrued on the unpaid principal balance. All interest accrued but not received on loans placed on non-accrual is reversed against interest income. Included in traditional C&I loans at March 31, 2021, were $110.1 million principal balance of loans originated under the Small Business Administration (“SBA”) Paycheck Protection Program (“PPP”). The CARES Act authorized the SBA to temporarily guarantee loans under a new 7(a) loan program, the PPP. These loans are 100% guaranteed by the SBA and the full principal amount of the loan may qualify for forgiveness. The loans we originated have a maturity of two years, an interest rate of 1.00% and loan payments are deferred for the initial three months. In the three months ended March 31, 2021, we sold $70.0 million of loans, largely comprised of commercial real estate loans, the majority of which were rated special mention and substandard. At March 31, 2021 and December 31, 2020, the Bank pledged residential mortgage and CRE loans of $6.2 billion and $6.5 billion, respectively, to the FHLB as collateral for certain borrowing arrangements. See Note 7. “Borrowings”. Portfolio loans: An analysis of the aging of portfolio loans, segregated by loan type as of March 31, 2021, is presented below: March 31, 2021 Current 30-59 60-89 90+ Total Traditional C&I $ 2,865,977 $ 2,659 $ 997 $ 16,703 $ 2,886,336 Asset-based lending 693,015 — — — 693,015 Payroll finance 153,987 — — — 153,987 Warehouse lending 1,394,945 — — — 1,394,945 Factored receivables 229,629 — — — 229,629 Equipment financing 1,449,419 2,975 2,526 20,796 1,475,716 Public sector finance 1,617,986 — — — 1,617,986 CRE 6,012,339 4,057 10,079 2,807 6,029,282 Multi-family 4,377,043 14,026 3 778 4,391,850 ADC 593,295 — — 25,000 618,295 Residential mortgage 1,462,169 7,381 2,702 14,345 1,486,597 Consumer 163,360 1,229 398 9,348 174,335 Total loans $ 21,013,164 $ 32,327 $ 16,705 $ 89,777 $ 21,151,973 Total TDRs included above $ 74,064 $ — $ 490 $ 1,892 $ 76,446 Non-performing loans: Loans 90+ days past due and still accruing $ 2 Non-accrual loans 168,555 Total non-performing loans $ 168,557 The following table represents an analysis of the aging of portfolio loans, segregated by loan type as of: December 31, 2020 Current 30-59 60-89 90+ Total Traditional C&I $ 2,905,964 $ 1,215 $ 6,054 $ 6,972 $ 2,920,205 Asset-based lending 803,004 — — — 803,004 Payroll finance 159,237 — — — 159,237 Warehouse lending 1,953,677 — — — 1,953,677 Factored receivables 220,217 — — — 220,217 Equipment financing 1,469,653 24,286 11,077 26,093 1,531,109 Public sector finance 1,572,819 — — — 1,572,819 CRE 5,794,115 13,591 17,421 6,863 5,831,990 Multi-family 4,393,950 11,578 811 321 4,406,660 ADC 612,943 — — 30,000 642,943 Residential mortgage 1,590,068 7,444 3,426 15,703 1,616,641 Consumer 178,587 1,043 907 9,370 189,907 Total loans $ 21,654,234 $ 59,157 $ 39,696 $ 95,322 $ 21,848,409 Total TDRs included above $ 60,257 $ 2,927 $ 13,492 $ 2,295 $ 78,971 Non-performing loans: Loans 90+ days past due and still accruing $ 170 Non-accrual loans 166,889 Total non-performing loans $ 167,059 The following table presents the amortized cost basis of collateral-dependent loans by loan type and collateral as of March 31, 2021: Collateral type Real estate Business assets Equipment Taxi medallions Total Traditional C&I $ 412 $ 24,781 $ 5,428 $ 7,376 $ 37,997 Asset-based lending — 13,264 — — 13,264 Payroll finance — 2,313 — — 2,313 Equipment finance — 1,885 13,366 — 15,251 CRE 36,114 — — — 36,114 Multi-family 7,725 — — — 7,725 ADC 25,000 — — — 25,000 Residential mortgage 6,214 — — — 6,214 Consumer 6,093 — — — 6,093 Total $ 81,558 $ 42,243 $ 18,794 $ 7,376 $ 149,971 Collateral-dependent loans include all loans that were TDRs at March 31, 2021. In the table above, $123.1 million of the total loans were on non-accrual at March 31, 2021. Business assets that secure traditional C&I and asset-based lending loans generally include accounts receivable, inventory, machinery and equipment. There were no warehouse lending, factored receivables or public sector finance loans that were collateral-dependent at March 31, 2021. The following table presents the amortized cost basis of collateral-dependent loans by loan type and collateral as of December 31, 2020: Collateral type Real estate Business assets Equipment Taxi medallions Total Traditional C&I $ 425 $ — $ 5,998 $ 10,916 $ 17,339 Asset-based lending — 8,280 — — 8,280 Payroll finance — 2,300 — — 2,300 Equipment finance — 1,117 10,461 — 11,578 CRE 53,212 — — — 53,212 Multi-family 9,914 — — — 9,914 ADC 30,000 — — — 30,000 Residential mortgage 5,025 — — — 5,025 Consumer 7,384 — — — 7,384 Total $ 105,960 $ 11,697 $ 16,459 $ 10,916 $ 145,032 Collateral-dependent loans include all loans that were TDRs at December 31, 2020. In the table above, $115.9 million of the total loans were on non-accrual at December 31, 2020. Business assets that secure traditional C&I and asset-based lending loans generally include accounts receivable, inventory, machinery and equipment. There were no warehouse lending, factored receivables or public sector finance loans that were collateral-dependent at December 31, 2020. The following table provides additional information on our non-accrual loans and loans 90 days past due: March 31, 2021 December 31, 2020 Total Non-accrual Loans Non-accrual loans with no ACL Loans 90 days or more past due still accruing interest Total Non-accrual Loans Non-accrual loans with no ACL Loans 90 days or more past due still accruing interest Traditional C&I $ 50,351 $ 12,804 $ — $ 19,223 $ 16,914 $ 94 Asset-based lending 10,149 5,789 — 5,255 4,613 — Payroll finance 2,313 2,313 — 2,300 2,300 — Equipment financing 28,868 15,252 2 30,634 11,578 2 CRE 24,269 858 — 46,053 38,529 74 Multi-family 778 — — 4,485 2,156 — ADC 25,000 — — 30,000 — — Residential mortgage 17,081 3,264 — 18,661 808 — Consumer 9,746 775 — 10,278 875 — Total $ 168,555 $ 41,055 $ 2 $ 166,889 $ 77,773 $ 170 When the ultimate collectability of the total principal of a loan is in doubt and the loan is on non-accrual status, all payments are applied to principal under the cost recovery method. When the ultimate collectability of the total principal of a loan is not in doubt and the loan is on non-accrual status, contractual interest is credited to interest income when received, under the cash basis method. At March 31, 2021 and December 31, 2020, the recorded carrying value of residential mortgage loans that were in the process of foreclosure was $2.9 million and $3.2 million, respectively, which is included in non-accrual residential mortgage loans above. There were no warehouse lending or public sector finance loans that were non-accrual or 90 days past due at March 31, 2021 or December 31, 2020. The following table provides information on accrued interest receivable that was reversed against interest income for the three months ended March 31, 2021 and March 31, 2020: For the three months ended March 31, 2021 2020 Traditional C&I $ 36 $ 7 Asset-based lending — 67 Equipment financing 38 — CRE 7 146 Multi-family — 27 ADC — 297 Residential mortgage 173 80 Consumer 19 7 Total interest reversed $ 273 $ 631 Short-term Loan Deferrals Under the CARES Act, financial institutions are permitted to not classify loan modifications that result from the impact of the COVID-19 pandemic as TDR, providing: • The modifications were made between March 1, 2020 and, as modified by the Consolidated Appropriations Act, the earlier of January 31, 2022, and or 60 days after the end of the public health emergency, and • The underlying loans were not more than 30 days past due as of December 31, 2019. We implemented a loan modification program in accordance with the CARES Act to provide temporary relief to borrowers that meet the requirements. The program allows for deferral of payments for up to 90 days, which we may extend for an additional 90 days at our option. The deferred payments and accrued interest during the deferral period are due and payable on or before the maturity of the loan. At March 31, 2021, we have granted temporary deferrals to borrowers on 237 loans with an outstanding balance of $130.5 million. There was $8.5 million of accrued interest associated with these loans. Under the provisions of the CARES Act, none of these loans were considered TDR at March 31, 2021. The table below reflects the balance of deferrals by portfolio: Non-pass rated loans Loan balance outstanding Deferral of principal and interest % Special mention Substandard Commercial C&I: Traditional C&I $ 2,886,336 $ — — % $ — $ — Asset-based lending 693,015 — — — — Payroll finance 153,987 — — — — Warehouse lending 1,394,945 — — — — Factored receivables 229,629 — — — — Equipment finance 1,475,716 3,143 0.2 — 2,297 Public sector finance 1,617,986 — — — — Total C&I 8,451,614 3,143 — — 2,297 Commercial mortgage: Commercial real estate 6,029,282 40,583 0.7 13,399 26,584 Multi-family 4,391,850 4,564 0.1 — — ADC 618,295 — — — — Total commercial mortgage 11,039,427 45,147 0.4 13,399 26,584 Total commercial 19,491,041 48,290 0.2 13,399 28,881 Residential 1,486,597 78,059 5.3 — 355 Consumer 174,335 4,176 2.4 — — Total Portfolio loans $ 21,151,973 $ 130,525 0.6 % $ 13,399 $ 29,236 TDRs At March 31, 2021 and December 31, 2020, TDRs were $76.4 million and $79.0 million, respectively. ACL - loans o f $4.3 million at March 31, 2021 and $0.9 million at December 31, 2020 were related to TDRs. The increase in the ACL - loans related to TDRs was based on updates to our expected lifetime losses for these loans. We did not have any outstanding commitments to lend additional amounts to customers with loans classified as TDRs as of March 31, 2021 or December 31, 2020. There were no loans that were classified as TDR in the three months ended March 31, 2021. The modification of the terms of loans that were considered a TDR in the three months ended March 31, 2020 consisted mainly of an extension of a loan maturity date, converting a loan to interest only for a defined period of time, deferral of interest payments, waiver of certain covenants, or reducing collateral requirements or interest rates. The following table presents loans classified as TDRs during the first three months of 2021 and 2020 broken down by segment: March 31, 2021 March 31, 2020 Recorded investment Recorded investment Number Pre- Post- Number Pre- Post- Asset-based lending $ — $ — 1 $ 4,943 $ 4,943 Total TDRs — $ — $ — 1 $ 4,943 $ 4,943

Allowance for Credit Losses - L

Allowance for Credit Losses - Loans	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Allowance for Credit Losses - Loans	Allowance for Credit Losses - Loans Activity in our ACL - loans for the three months ended March 31, 2021 and March 31, 2020 is summarized in the table below: For the three months ended March 31, 2021 Beginning Charge-offs Recoveries Net Provision / (credit) Ending balance Traditional C&I $ 42,670 $ (1,027) $ 468 $ (559) $ 4,282 $ 46,393 Asset-based lending 12,762 — — — (1,597) 11,165 Payroll finance 1,957 — 2 2 (440) 1,519 Warehouse lending 1,724 — — — (492) 1,232 Factored receivables 2,904 (4) 406 402 (69) 3,237 Equipment financing 31,794 (2,408) 854 (1,554) (2,215) 28,025 Public sector finance 4,516 — — — 116 4,632 CRE 155,313 (2,933) 487 (2,446) 6,555 159,422 Multi-family 33,320 (3,230) — (3,230) 3,286 33,376 ADC 17,927 (5,000) — (5,000) 876 13,803 Residential mortgage 16,529 (267) 37 (230) (329) 15,970 Consumer 4,684 (391) 92 (299) 27 4,412 Total ACL - loans $ 326,100 $ (15,260) $ 2,346 $ (12,914) $ 10,000 $ 323,186 Annualized net charge-offs to average loans outstanding: 0.25 % For the three months ended March 31, 2020 Beginning CECL Day 1 Charge-offs Recoveries Net Provision / (credit) Ending balance Traditional C&I $ 15,951 $ 5,325 $ (298) $ 475 $ 177 $ 13,836 $ 35,289 Asset-based lending 14,272 11,973 (985) — (985) 1,230 26,490 Payroll finance 2,064 1,334 — 9 9 323 3,730 Warehouse lending 917 (362) — — — (266) 289 Factored receivables 654 795 (7) 4 (3) 7,748 9,194 Equipment financing 16,723 33,000 (4,793) 1,105 (3,688) 13,993 60,028 Public sector finance 1,967 (766) — — — 728 1,929 CRE 27,965 8,037 (1,275) 60 (1,215) 62,799 97,586 Multi-family 11,440 14,906 — — — 22,751 49,097 ADC 4,732 (119) (3) 105 102 10,489 15,204 Residential mortgage 7,598 14,104 (1,072) — (1,072) 2,460 23,090 Consumer 1,955 2,357 (1,405) 1,125 (280) 486 4,518 Total ACL - loans $ 106,238 $ 90,584 $ (9,838) $ 2,883 $ (6,955) $ 136,577 $ 326,444 Annualized net charge-offs to average loans outstanding: 0.13 % Credit Quality Indicators As part of the ongoing monitoring of the credit quality of our loan portfolio, management tracks certain credit quality indicators, including trends related to: (i) the weighted-average risk grade of commercial loans; (ii) the level of classified commercial loans; (iii) the delinquency status of residential mortgage and consumer loans, including home equity lines of credit (“HELOC”) and other consumer loans; (iv) net charge-offs; (v) non-performing loans (see details above); and (vi) the general economic conditions in the New York Metro Market. We analyze loans individually by classifying the loans by credit risk, except residential mortgage loans, HELOC and other consumer loans, which are evaluated on a homogeneous pool basis unless the loan balance is greater than $750 thousand. This analysis is performed at least quarterly on all graded 7-Special Mention and lower loans. We use the following definitions of risk ratings: 1 and 2 - These grades include loans that are secured by cash, marketable securities or cash surrender value of life insurance policies. 3 - This grade includes loans to borrowers with strong earnings and cash flow that have the ability to service debt. The borrower’s assets and liabilities are generally well-matched and are above average quality. The borrower has ready access to multiple sources of funding, including alternatives such as term loans, private equity placements or trade credit. 4 - This grade includes loans to borrowers with above average cash flow, adequate earnings and debt service coverage ratios. The borrower generates discretionary cash flow, assets and liabilities are reasonably matched, and the borrower has access to other sources of debt funding or additional trade credit at market rates. 5 - This grade includes loans to borrowers with adequate earnings and cash flow and reasonable debt service coverage ratios. Overall leverage is acceptable and there is average reliance upon trade credit. Management has a reasonable amount of experience and depth, and owners are willing to invest available outside capital, as necessary. 6 - This grade includes loans to borrowers where there is evidence of some strain, earnings are inconsistent and volatile, and the borrowers’ outlook is uncertain. Generally, such borrowers have higher leverage than those with a better risk rating. These borrowers typically have limited access to alternative sources of bank debt and may be dependent upon debt funding for working capital support. 7 - Special Mention (OCC definition) - Other Assets Especially Mentioned are loans that have potential weaknesses which may, if not reversed or corrected, weaken the asset or inadequately protect the Bank’s credit position at some future date. Such assets constitute an undue and unwarranted credit risk but not to the point of justifying a classification of “Substandard.” The credit risk may be relatively minor yet constitute an unwarranted risk in light of the circumstances surrounding a specific asset. 8 - Substandard (OCC definition) - These loans are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Assets so classified must have a well-defined weakness that jeopardizes the liquidation of the debt. They are characterized by the distinct possibility that the Bank will sustain some losses if the deficiencies are not corrected. Loss potential, while existing in the aggregate amount of substandard assets, does not have to exist in individual assets classified as substandard. 9 - Doubtful (OCC definition) - These loans have all the weakness inherent in one classified as “Substandard” with the added characteristics that the weakness makes collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. The possibility of loss is extremely high, but, because of certain important and reasonably specific pending factors which may work to the advantage and strengthening of the asset, its classification as an estimated loss is deferred until its more exact status may be determined. Pending factors may include a proposed merger, acquisition, liquidating procedures, capital injection, perfecting liens or additional collateral and refinancing plans. 10 - Loss (OCC definition) - These loans are charged-off because they are determined to be uncollectible and unbankable assets. This classification does not indicate that the asset has no absolute recovery or salvage value, but rather it is not practical or desirable to defer writing-off this asset even though partial recovery may be effected in the future. Losses should be taken in the period in which they are determined to be uncollectible. Loans that are risk-rated 1 through 6 as defined above are considered to be pass-rated loans. As of March 31, 2021 and December 31, 2020, the risk category of non-pass rated loans by segment was as follows: March 31, 2021 December 31, 2020 Special Mention Substandard Special Mention Substandard Traditional C&I $ 37,627 $ 95,527 $ 24,162 $ 84,792 Asset-based lending 92,534 13,817 111,597 11,669 Payroll finance 1,176 2,313 — 2,300 Factored receivables — — 5,523 — Equipment financing 6,323 47,527 7,737 45,018 CRE 240,770 347,393 249,403 280,796 Multi-family 114,402 31,328 61,146 44,872 ADC 1,613 25,000 1,407 30,000 Residential mortgage — 17,368 468 18,942 Consumer 7 9,836 15 10,371 Total $ 494,452 $ 590,109 $ 461,458 $ 528,760 At March 31, 2021 and December 31, 2020 there were no warehouse lending or public sector finance loans rated special mention or substandard. At March 31, 2021, there were $295 thousand traditional C&I loans rated doubtful and no loans rated loss. At December 31, 2020, there were $304 thousand of traditional C&I loans rated doubtful and no loans rated loss. We evaluate whether a modification, extension or renewal of a loan is a current period origination in accordance with GAAP. Generally, loans up for renewal are subject to a full credit evaluation before the renewal is granted and such loans are considered current period originations for purposes of the table below. At March 31, 2021, our loans based on year of origination and risk designation is as follows: Term loans amortized cost basis by origination year Revolving loans converted to term 2021 2020 2019 2018 2017 Prior Revolving loans Total Traditional C&I Pass $ 55,876 $ 394,938 $ 202,836 $ 247,049 $ 120,169 $ 162,274 $ 1,569,746 $ — $ 2,752,888 Special mention 438 165 8,846 17,261 4,030 1,555 5,332 — 37,627 Substandard 11 1,124 37,250 18,562 6,668 10,052 21,860 — 95,527 Doubtful — — — — — — 295 — 295 Total traditional C&I 56,325 396,227 248,932 282,872 130,867 173,881 1,597,233 — 2,886,337 Asset-Based Loans Pass 12,108 45,326 27,339 5,451 10,212 58,968 427,260 — 586,664 Special mention — — 738 9,477 13,753 — 68,566 — 92,534 Substandard — — — — — 553 13,264 — 13,817 Total asset-based lending 12,108 45,326 28,077 14,928 23,965 59,521 509,090 — 693,015 Payroll Finance Pass — — 8,014 — — — 142,484 — 150,498 Special mention — — — — — — 1,176 — 1,176 Substandard — — — — — — 2,313 — 2,313 Total payroll finance — — 8,014 — — — 145,973 — 153,987 Warehouse Lending Pass 41,469 112,045 41,103 53,592 236,757 909,979 — — 1,394,945 Special mention — — — — — — — — — Substandard — — — — — — — — — Total warehouse lending 41,469 112,045 41,103 53,592 236,757 909,979 — — 1,394,945 Factored Receivables Pass — — — — — — 229,629 — 229,629 Total factored receivables — — — — — — 229,629 — 229,629 Equipment Financing Pass 82,999 408,641 498,484 224,618 93,669 113,455 — — 1,421,866 Special mention — — 3,999 2,023 185 116 — — 6,323 Substandard — 12 22,254 8,631 12,422 4,208 — — 47,527 Total equipment financing 82,999 408,653 524,737 235,272 106,276 117,779 — — 1,475,716 Public Sector Finance Term loans amortized cost basis by origination year Revolving loans converted to term 2021 2020 2019 2018 2017 Prior Revolving loans Total Pass 73,774 437,123 398,280 206,591 261,963 240,255 — — 1,617,986 Total public sector finance 73,774 437,123 398,280 206,591 261,963 240,255 — — 1,617,986 CRE Pass 168,163 1,047,246 1,247,285 882,651 514,007 1,581,766 — — 5,441,118 Special mention — 8,349 111,559 19,246 54,793 46,823 — — 240,770 Substandard — 37,821 65,059 95,688 29,448 119,377 — — 347,393 Total CRE 168,163 1,093,416 1,423,903 997,585 598,248 1,747,966 — — 6,029,281 Multi-family Pass 211,873 371,457 707,272 431,720 600,632 1,855,436 67,730 — 4,246,120 Special mention — — 32,370 8,178 26,082 43,742 4,030 — 114,402 Substandard — — 10,185 — — 18,196 2,947 — 31,328 Total multi-family 211,873 371,457 749,827 439,898 626,714 1,917,374 74,707 — 4,391,850 ADC Pass 25,451 114,913 274,904 100,437 28,971 47,006 — — 591,682 Special mention — 1,613 — — — — — — 1,613 Substandard — — — — 25,000 — — — 25,000 Total ADC 25,451 116,526 274,904 100,437 53,971 47,006 — — 618,295 Residential Pass 230 10,594 11,088 31,989 40,801 1,374,527 — — 1,469,229 Substandard — — — — — 17,368 — — 17,368 Total residential 230 10,594 11,088 31,989 40,801 1,391,895 — — 1,486,597 Consumer Pass — 70 358 376 222 5,013 98,640 59,813 164,492 Special mention — — — — — — 7 — 7 Substandard — — — — — 394 3,225 6,217 9,836 Total consumer — 70 358 376 222 5,407 101,872 66,030 174,335 Total Loans $ 672,392 $ 2,991,437 $ 3,709,223 $ 2,363,540 $ 2,079,784 $ 6,611,063 $ 2,658,504 $ 66,030 $ 21,151,973

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The balance of goodwill and other intangible assets for the periods presented were as follows: March 31, December 31, 2021 2020 Goodwill $ 1,683,482 $ 1,683,482 Other intangible assets: Core deposits $ 66,180 $ 69,808 Customer lists 3,108 3,256 Trade name 20,500 20,500 Total $ 89,788 $ 93,564 The decrease in other intangible assets at March 31, 2021 compared to December 31, 2020 was due to amortization of intangibles. The estimated aggregate future amortization expense for intangible assets remaining as of March 31, 2021 was as follows: Amortization expense Remainder of 2021 $ 11,328 2022 13,703 2023 12,322 2024 10,448 2025 8,722 2026 7,134 Thereafter 5,631 Total $ 69,288

Deposits

Deposits	3 Months Ended
	Mar. 31, 2021
Deposits [Abstract]
Deposits	Deposits Deposit balances at March 31, 2021 and December 31, 2020 were as follows: March 31, December 31, 2021 2020 Non-interest bearing demand $ 5,691,429 $ 5,443,907 Interest bearing demand 5,132,937 4,960,800 Savings 2,690,445 2,603,570 Money market 8,568,965 8,114,415 Certificates of deposit 1,757,942 1,996,830 Total deposits $ 23,841,718 $ 23,119,522 Total municipal deposits, which are included in the deposit balances above, were $2.0 billion and $1.6 billion at March 31, 2021 and December 31, 2020, respectively. See Note 2. “Securities” for the aggregate amount of securities that were pledged as collateral for municipal deposits and other purposes. Brokered deposits at March 31, 2021 and December 31, 2020 were as follows: March 31, December 31, 2021 2020 Interest bearing demand $ 399,000 $ 433,790 Money market 1,034,070 1,045,478 Certificates of deposit 151,017 100,003 Total brokered deposits $ 1,584,087 $ 1,579,271

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2021
Debt Instruments [Abstract]
Borrowings	Borrowings Our borrowings and weighted average interest rates were as follows for the periods presented: March 31, December 31, 2021 2020 Amount Rate Amount Rate By type of borrowing: FHLB borrowings $ — — % $ 382,000 0.35 % Repurchase agreements 31,679 0.10 27,101 0.10 Federal funds purchased — — 277,000 0.11 Subordinated Notes - Bank 143,757 5.45 143,703 5.45 Subordinated Notes - 2029 270,366 4.18 270,284 4.17 Subordinated Notes - 2030 221,697 4.06 221,626 4.06 Total borrowings $ 667,499 4.22 % $ 1,321,714 2.25 % By remaining period to maturity: Less than one year $ 31,679 0.10 % $ 686,101 0.24 % Greater than five years 635,820 4.43 635,613 4.43 Total borrowings $ 667,499 4.22 % $ 1,321,714 2.25 % FHLB borrowings. As a member of the FHLB, the Bank may borrow up to a discounted percentage of the amount of eligible mortgages and securities that have been pledged as collateral under a blanket security agreement. As of March 31, 2021 and December 31, 2020, the Bank had total residential mortgage and CRE loans pledged after discount of $6.2 billion and $6.5 billion, respectively. In addition to the pledged mortgages, the Bank had also pledged securities to secure borrowings, which are disclosed in Note 2. “Securities.” As of March 31, 2021, the Bank had unused borrowing capacity at the FHLB of $6.2 billion and may increase such borrowing capacity by pledging securities not required to be pledged for other purposes with a collateral value of approximately $2.1 billion. Subordinated Notes - Bank. On April 1, 2021, we redeemed the remaining balance of subordinated notes - Bank outstanding. Effective April 1, 2021, the eligibility of the subordinated notes - Bank as qualifying Tier 2 capital decreased by 20%. In anticipation of this redemption, we contributed $175.0 million as equity capital into the Bank in the fourth quarter of 2020.

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedges, Assets [Abstract]
Derivatives	DerivativesTo facilitate interest rate swap contracts with customers (all of which are considered over-the-counter or “OTC”), we have entered into corresponding “back-to-back” interest rate swap contracts both on the OTC, and on exchange on futures markets such as the Chicago Mercantile Exchange (“CME”) and London Clearing House (“LCH”). At March 31, 2021 and December 31, 2020, the OTC derivatives are included in our consolidated financial statements at the gross fair value amount of the asset (included in other assets) and liability (included in other liabilities), which incorporates the change in the fair value of the contract since inception. The CME legally characterizes variation margin payments (a payment made based on changes in the fair value of the interest rate swap contracts) as a settlement, referred to as settled-to-market (“STM”) transaction. As a result, at March 31, 2021 and December 31, 2020, we posted cash collateral under STMs in the amounts of $60.5 million and $89.8 million, respectively, for the net change in fair value of our CME and LCH interest rate swap contracts. The decrease was mainly due to changes in the fair value of the underlying interest rate swap contracts, which may change daily, positively or negatively, mainly due to changes in interest rates. We do not typically require our commercial customers to post cash or securities as collateral on their swaps. However, our swap contracts incorporate certain standard terms contained in the International Swaps and Derivatives Association agreement and loan documents whereby, in the event of default, we are permitted to access collateral supporting the loan relationship to recover any losses suffered on the derivative asset or liability. Summary information as of March 31, 2021 and December 31, 2020 regarding these derivatives is presented below: Notional Average Weighted Weighted Fair value March 31, 2021 Included in other assets: Third-party interest rate swap $ — $ — Customer interest rate swap 1,913,381 105,772 Total $ 1,913,381 4.29 4.42 % 1 m Libor + 2.21% $ 105,772 Included in other liabilities: Third-party interest rate swap $ 1,913,381 $ 45,233 Customer interest rate swap — — Total $ 1,913,381 4.29 4.42 % 1 m Libor + 2.21% $ 45,233 December 31, 2020 Included in other assets: Third-party interest rate swap $ — $ — Customer interest rate swap 1,913,607 149,797 Total $ 1,913,607 4.40 4.44 % 1 m Libor + 2.20% $ 149,797 Included in other liabilities: Third-party interest rate swap $ 1,913,607 $ 60,004 Customer interest rate swap — — Total $ 1,913,607 4.40 4.44 % 1 m Libor + 2.20% $ 60,004

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Actual income tax expense differs from the tax computed based on pre-tax income and the applicable statutory federal tax rate for the following reasons: For the three months ended March 31, 2021 2020 Income before income tax expense $ 122,105 $ 6,105 Tax at federal statutory rate of 21% 25,642 1,282 State and local income taxes, net of federal tax benefit 6,160 589 Tax exempt interest, net of disallowed interest (5,777) (7,409) BOLI income (1,004) (1,111) Low income housing tax credits and other benefits (13,780) (8,462) Low income housing investment amortization expense 11,507 7,401 Tax rate adjustment benefit due to CARES Act net operating loss (“NOL”) carryback — (21,313) Uncertain tax position reserve — 11,480 Annual effective tax rate adjustment — 8,248 Non-deductible compensation expense 1 640 — Equity-based stock compensation (benefit) expense (152) 491 FDIC insurance premium limitation 257 256 Other, net (538) 506 Actual income tax expense (benefit) $ 22,955 $ (8,042) Effective income tax rate 18.8 % (131.7) % 1 Includes $517 thousand from the write-off of deferred tax assets related to the vesting of restricted stock that will not be deductible based on Section 162(m) limitations. Net deferred tax liabilities were $33.8 million at March 31, 2021, compared to $43.3 million at December 31, 2020. The change was mainly due to the change in value of our available for sale securities in the first quarter of 2021. No valuation allowance was recorded against any deferred tax assets as of those dates, based upon management’s evaluation of historical and anticipated future pre-tax income, and the reversal periods for the items resulting in deferred tax assets and liabilities. As of March 31, 2021, the accrual for unrecognized gross tax benefits was as follows: For the three months ended March 31, 2021 2020 Uncertain tax positions beginning of period $ 7,000 $ — Additions for tax positions related to prior tax years — 11,480 Decrease due to settlement — — Interest expense in tax positions — — Uncertain tax positions at end of period $ 7,000 $ 11,480 Significant tax filings that remain open for examination include the following: • Federal for tax years 2017 through present; • New York State tax filings for tax years 2017 through present; • New York City tax filings for tax years 2015 through present; and • New Jersey State tax filings for tax years 2017 through present. Generally speaking, we are no longer subject to examination by federal, state or local taxing authorities in respect of tax years prior to December 31, 2017.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Stock-Based Compensation	Stock-Based Compensation The following table summarizes the activity in our stock-based compensation plan for the three months ended March 31, 2021: Non-vested stock awards/stock units outstanding Stock options outstanding Shares available for grant Number of shares Weighted average grant date fair value Number of shares Weighted average exercise price Balance at January 1, 2021 1,811,418 2,993,643 $ 19.54 336,621 $ 11.41 Granted (1,138,246) 1,138,246 20.36 — — Stock awards vested — (820,633) 21.31 — — Exercised — — — (73,946) 10.17 Forfeited 21,775 (21,775) 19.05 — — Canceled/expired 31,109 (31.109) 20.85 — — Balance at March 31, 2021 726,056 3,258,372 $ 19.37 262,675 $ 11.41 Exercisable at March 31, 2021 262,675 $ 11.41 The total intrinsic value of outstanding in-the-money stock options, all of which are exercisable, was $3.1 million at March 31, 2021. We use an option pricing model to estimate the grant date fair value of stock options granted. There were no stock options granted during the three months ended March 31, 2021 or March 31, 2020. We incurred no stock option expense during the three month periods ended March 31, 2021 and 2020. Stock-based compensation expense is recognized ratably over the requisite service period for all awards. Stock-based compensation expense associated with non-vested stock awards and the related income tax benefit, and proceeds from stock option exercises are presented below: For the three months ended March 31, 2021 2020 Stock options $ — $ — Non-vested stock awards/performance units 6,617 6,006 Non-vested stock awards/performance units $ 6,617 $ 6,006 Income tax benefit 1,224 1,051 Proceeds from stock option exercises 752 414 Unrecognized stock-based compensation expense as of March 31, 2021 was $48.6 million and is expected to be recognized over 1.97 years.

Other Non-Interest Expense, Oth

Other Non-Interest Expense, Other Assets and Other Liabilities	3 Months Ended
	Mar. 31, 2021
Other Income and Expenses [Abstract]
Other Non-Interest Expense, Other Assets and Other Liabilities	Other Non-Interest Expense, Other Assets and Other Liabilities (a) Other Non-Interest Expense Other non-interest expense items for the three months ended March 31, 2021 and 2020, respectively, are presented in the following table: For the three months ended March 31, 2021 2020 Other non-interest expense: Depreciation expense on operating leases $ 3,124 $ 3,492 Advertising and promotion 1,708 1,983 Communications 1,427 1,630 Residential mortgage loans servicing 1,449 1,377 Commercial loan servicing 979 1,025 Insurance & surety bond premium 914 1,091 Operational losses 593 605 Other 4,858 5,460 Total other non-interest expense $ 15,052 $ 16,663 (b) Other Assets Other assets are presented in the following table. Significant components of the aggregate of other assets are presented separately. March 31, December 31, 2021 2020 Other assets: Low income housing tax credit investments $ 484,885 $ 488,303 Right of use asset for operating leases 101,495 105,667 Fair value of swaps 105,772 149,797 Cash on deposit as swap collateral / net of settlement 69,014 82,478 Operating leases - equipment and vehicles leased to others 51,999 55,224 Other asset balances 193,003 181,934 Total other assets $ 1,006,168 $ 1,063,403 Other asset items include current income tax balances, prepaid insurance, prepaid property taxes, prepaid maintenance, accounts receivable and other miscellaneous assets. (c) Other Liabilities Other liabilities are presented in the following table. Significant components of the aggregate of other liabilities are presented separately. March 31, December 31, 2021 2020 Other liabilities: Commitment to fund low income housing tax credit investments $ 276,974 $ 283,849 Lease liability 109,720 113,405 Payroll finance and factoring liabilities 125,831 115,802 Swap liabilities (see Note 8) 45,233 60,004 Other liability balances 144,898 155,642 Total other liabilities $ 702,656 $ 728,702

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share The following is a summary of the calculation of earnings per common share (“EPS”): For the three months ended March 31, 2021 2020 Net income available to common stockholders $ 97,187 $ 12,171 Weighted average common shares outstanding for computation of basic EPS 191,890,512 196,344,061 Common-equivalent shares due to the dilutive effect of stock options and unvested performance share grants (1) 731,395 364,977 Weighted average common shares for computation of diluted EPS 192,621,907 196,709,038 EPS (2) : Basic $ 0.51 $ 0.06 Diluted 0.50 0.06 (1) Represents incremental shares computed using the treasury stock method. (2) Anti-dilutive shares are not included in determining diluted EPS. Anti-dilutive shares were 0 and 23,590 for the three months ended March 31, 2021 and 2020, respectively.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2021
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders’ Equity (a) Regulatory Capital Requirements Banks and bank holding companies are subject to various regulatory capital requirements administered by the federal banking agencies. Capital adequacy guidelines, and additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators about components, risk-weighting, and other factors. The Company’s and the Bank’s Common Equity Tier 1 capital consists of common stock and related paid-in capital, net of treasury stock, and retained earnings. In connection with the adoption of the Basel III Capital Rules, we elected to opt-out of the requirement to include most components of accumulated other comprehensive income in Common Equity Tier 1 capital. Common Equity Tier 1 capital for both the Company and the Bank is reduced by goodwill and other intangible assets, net of associated deferred tax liabilities and subject to transition provisions. Tier 1 capital includes Common Equity Tier 1 capital and additional Tier 1 capital. Total capital includes Tier 1 capital and Tier 2 capital. Tier 2 capital (as defined in the regulations) for both the Bank and us includes a permissible portion of the ACL and $143.8 million and $97.9 million of the Subordinated Notes - Bank, respectively. Tier 2 capital at the Company also includes $492.1 million of the Subordinated Notes - Company. During the final five years of the term of the Subordinated Notes, the permissible portion eligible for inclusion in Tier 2 capital decreases by 20% annually. The Common Equity Tier 1, Tier 1 and Total capital ratios are calculated by dividing the respective capital amounts by risk-weighted assets (“RWA”). RWA is calculated based on regulatory requirements and includes total assets, excluding goodwill and other intangible assets, allocated by risk weight category, and certain off-balance-sheet items, among other items. As permitted by the interim final rule issued on March 27, 2020 by our federal regulatory agency, we elected the option to delay the estimated impact of the adoption of the CECL Standard in our regulatory capital for two years. This two-year delay is in addition to the three-year transition period the agency had already made available. The adoption will delay the effects of CECL on our regulatory capital for the next two years, after which the effects will be phased-in over a three-year period from January 1, 2022 through December 31, 2024. Under the interim final rule, the amount of adjustments to regulatory capital deferred until the phase-in period include both the initial impact of adoption of the CECL Standard at January 1, 2020 and 25% of subsequent changes in our ACL during each quarter of the two-year period ending December 31, 2021. The following tables present actual and required capital ratios as of March 31, 2021 and December 31, 2020 for us and the Bank under the Basel III Capital Rules. The minimum required capital amounts presented as of March 31, 2021 and December 31, 2020 are based on the fully phased-in provisions of the Basel III Capital Rules. Capital levels required to be considered well-capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. Actual Minimum capital required - Basel III Required to be considered well- capitalized Capital amount Ratio Capital amount Ratio Capital amount Ratio March 31, 2021 Common equity tier 1 to RWA: Sterling National Bank $ 3,269,545 14.04 % $ 1,630,407 7.00 % $ 1,513,949 6.50 % Sterling Bancorp 2,786,496 11.95 1,632,817 7.00 N/A N/A Tier 1 capital to RWA: Sterling National Bank 3,269,545 14.04 % 1,979,780 8.50 % 1,863,322 8.00 % Sterling Bancorp 2,922,954 12.53 1,982,706 8.50 N/A N/A Total capital to RWA: Sterling National Bank 3,590,726 15.42 % 2,445,610 10.50 % 2,329,152 10.00 % Sterling Bancorp 3,690,353 15.82 2,449,225 10.50 N/A N/A Tier 1 leverage ratio: Sterling National Bank 3,269,545 11.76 % 1,111,894 4.00 % 1,389,867 5.00 % Sterling Bancorp 2,922,954 10.50 1,113,426 4.00 N/A N/A Actual Minimum capital required - Basel III fully phased-in Required to be considered well- capitalized Capital amount Ratio Capital amount Ratio Capital amount Ratio December 31, 2020 Common equity tier 1 to RWA: Sterling National Bank $ 3,198,145 13.38 % $ 1,673,516 7.00 % $ 1,553,979 6.50 % Sterling Bancorp 2,727,385 11.39 1,675,747 7.00 N/A N/A Tier 1 capital to RWA: Sterling National Bank 3,198,145 13.38 % 2,032,127 8.50 % 1,912,590 8.00 % Sterling Bancorp 2,864,074 11.96 2,034,836 8.50 N/A N/A Total capital to RWA: Sterling National Bank 3,521,458 14.73 % 2,510,274 10.50 % 2,390,737 10.00 % Sterling Bancorp 3,638,033 15.20 2,513,621 10.50 N/A N/A Tier 1 leverage ratio: Sterling National Bank 3,198,145 11.33 % 1,128,913 4.00 % 1,411,142 5.00 % Sterling Bancorp 2,864,074 10.14 1,130,362 4.00 N/A N/A The Bank and the Company are subject to the regulatory capital requirements administered by the FRB, and, for the Bank, the Office of the Comptroller of the Currency. Regulatory authorities can initiate certain mandatory actions if the Bank or the Company fails to meet the minimum capital requirements, which could have a direct material effect on our financial statements. As of March 31, 2021 and December 31, 2020, the most recent regulatory notifications categorized the Company and the Bank as well capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the classification.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies (a) Off-Balance Sheet Financial Instruments The contractual or notional amounts of these instruments, which reflect the extent of our involvement in particular classes of off-balance sheet financial instruments, are summarized as follows: March 31, December 31, 2021 2020 Loan origination commitments $ 598,171 $ 641,965 Unused lines of credit 1,493,031 1,623,745 Letters of credit 175,305 181,890 We record ACL - off-balance sheet financial instrument exposures through a charge to other non-interest expense on our consolidated income statements. At March 31, 2021 and December 31, 2020, the ACL - off-balance sheet financial instrument credit exposures was $6.7 million and was included in other liabilities in our consolidated balance sheets. For the three months ended March 31, 2021 and 2020, credit loss expense for off-balance sheet financial instrument exposures was zero. Based on our review of quantitative and qualitative factors applicable to these financial instrument exposures, we did not record an increase in our off-balance sheet credit loss provision during the three months ended March 31, 2021 and 2020. (b) Leases Future minimum payments for operating leases with initial or remaining terms of one year or more as of March 31, 2021 were as follows: Remainder of 2021 $ 13,805 2022 18,069 2023 16,605 2024 14,790 2025 12,176 2026 11,054 2027 and thereafter 39,788 Total lease payments 126,287 Interest 16,567 Present value of lease liabilities $ 109,720 (c) Litigation We and the Bank are involved in a number of judicial proceedings concerning matters arising from our and its business activities. These include routine legal proceedings arising in the ordinary course of business. These proceedings also include actions brought against us and the Bank with respect to corporate matters and transactions in which we and the Bank are or were involved. There can be no assurance as to the ultimate outcome of a legal proceeding; however, we and the Bank have generally denied liability in all significant litigation pending against us and intend to vigorously defend each case, other than matters that are determined appropriate to be settled. We and the Bank accrue a liability for legal claims when payments associated with the claims become probable and the costs can be reasonably estimated. The actual costs of resolving legal claims may be substantially higher or lower than the amounts accrued for those claims. At March 31, 2021 and December 31, 2020, we had no significant amounts accrued in respect of pending litigation.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in an orderly transaction occurring in the principal or most advantageous market for such asset or liability between market participants on the measurement date. In estimating fair value, we use valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. GAAP establishes a fair value hierarchy comprised of three levels of inputs that may be used to measure fair values. Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets and liabilities that the reporting entity has the ability to access at the measurement date. Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risk, etc.) or inputs that are derived principally from, or corroborated by, market data by correlation or other means. Level 3 Inputs – Unobservable inputs for determining the fair value of assets or liabilities that reflect an entity’s own assumptions about the assumptions that market participants would use in pricing the assets or liabilities. In general, fair value is based on quoted market prices, when available. If quoted market prices in active markets are not available, fair value is based on internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and our creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. Our valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes its valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and therefore, estimates of fair value after the balance sheet date may differ significantly from the amounts presented herein. A more detailed description of the valuation methodologies used for assets and liabilities measured at fair value is set forth below. Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincide with our monthly and/or quarterly valuation process. AFS Investment Securities The majority of our available for sale investment securities are reported at fair value utilizing Level 2 inputs. For these securities, we obtain fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the securities’ terms and conditions, among other things. We review the prices supplied by the independent pricing service, as well as their underlying pricing methodologies, for reasonableness and to ensure such prices are aligned with traditional pricing matrices. In general, we do not purchase investment securities that have a complicated structure. Our entire portfolio consists of traditional investments, nearly all of which are mortgage pass-through securities, state and municipal general obligation or revenue bonds, U.S. agency bullet and callable securities and corporate bonds. Pricing for such instruments is fairly generic and is easily obtained. From time to time, we validate, on a sample basis, prices supplied by the independent pricing service by comparison to prices obtained from third-party sources or derived using internal models. As of March 31, 2021, management did not believe any of our securities are other-than-temporarily-impaired; however, management reviews all of our securities on at least a quarterly basis to assess whether impairment, if any, is other than temporary. Derivatives The fair values of derivatives are based on valuation models using current observable market data (including interest rates and fees), the remaining terms of the agreements and the credit worthiness of the counterparty as of the measurement date, which are considered Level 2 inputs. Our derivatives are traded in an over-the-counter market where quoted market prices are not always available. Our derivatives at March 31, 2021 and December 31, 2020 consisted of interest rate swaps. See Note 8. “Derivatives” for additional information. A summary of assets and liabilities at March 31, 2021 and December 31, 2020, respectively, measured at estimated fair value on a recurring basis, is as follows: March 31, 2021 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Assets: Investment securities available for sale: Residential MBS: Agency-backed $ 864,793 $ — $ 864,793 $ — CMOs/Other MBS 314,752 — 314,752 — Total residential MBS 1,179,545 — 1,179,545 — Other securities: Federal agencies 343,472 — 343,472 — Corporate 612,924 — 612,924 — State and municipal 388,730 — 388,730 — Total other securities 1,345,126 — 1,345,126 — Total AFS 2,524,671 — 2,524,671 — Swaps 105,772 — 105,772 — Total assets $ 2,630,443 $ — $ 2,630,443 $ — Liabilities: Swaps $ 45,233 $ — $ 45,233 $ — Total liabilities $ 45,233 $ — $ 45,233 $ — December 31, 2020 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Assets: Investment securities available for sale: Residential MBS: Agency-backed $ 918,260 $ — $ 918,260 $ — CMOs/Other MBS 373,284 — 373,284 — Total residential MBS 1,291,544 — 1,291,544 — Federal agencies 156,467 — 156,467 — Corporate 463,512 — 463,512 — State and municipal 387,095 — 387,095 — Total other securities 1,007,074 — 1,007,074 — Total AFS 2,298,618 — 2,298,618 — Swaps 149,797 — 149,797 — Total assets $ 2,448,415 $ — $ 2,448,415 $ — Liabilities: Swaps $ 60,004 $ — $ 60,004 $ — Total liabilities $ 60,004 $ — $ 60,004 $ — The following categories of financial assets are not measured at fair value on a recurring basis, but are subject to fair value adjustments in certain circumstances. Collateral Dependent Loans For collateral dependent loans, which are presented in the table below, where we determined that foreclosure of the collateral is probable, or where the borrower is experiencing financial difficulty and we expect repayment of the loan to be provided substantially through the operation or sale of the collateral, the ACL is measured based on the difference between the fair value of the collateral and the amortized cost basis of the loan as of the measurement date. For real estate loans, the fair value of the loan’s collateral is determined by third party appraisals, which are then adjusted for the estimated selling and closing costs related to liquidation of the collateral. The unobservable inputs may vary depending on the individual assets. We review third party appraisals for appropriateness and adjust the value downward to consider selling and closing costs, which generally range from 4% to 10% of the appraised value. For non-real estate loans, fair value of the loan’s collateral may be determined using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business. March 31, 2021 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Traditional C&I $ 7,376 $ — $ — $ 7,376 Asset-based lending 1,846 — — 1,846 Payroll finance 2,313 — — 2,313 Equipment financing 2,671 — — 2,671 CRE 25,156 — — 25,156 ADC 25,000 — — 25,000 Residential mortgage 1,307 — — 1,307 Consumer 2,451 — — 2,451 Total collateral dependent loans measured at fair value $ 68,120 $ — $ — $ 68,120 December 31, 2020 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Traditional C&I $ 10,916 $ — $ — $ 10,916 Asset-based lending 1,899 — — 1,899 Payroll finance 2,300 — — 2,300 CRE 27,323 — — 27,323 Residential mortgage 1,307 — — 1,307 Consumer 3,593 — — 3,593 Total collateral dependent loans measured at fair value $ 47,338 $ — $ — $ 47,338 Fair Value of Financial Instruments The following is a summary of the carrying amounts and estimated fair value of financial assets and liabilities (none of which were held for trading purposes) as of March 31, 2021: March 31, 2021 Carrying Level 1 inputs Level 2 inputs Level 3 inputs Financial assets: Cash and cash equivalents $ 935,633 $ 935,633 $ — $ — Securities AFS 2,524,671 — 2,524,671 — Securities HTM, net 1,716,786 — 1,826,232 — Loans held for sale 36,237 — 36,237 — Portfolio loans, net 20,828,787 — — 20,772,549 Accrued interest receivable on securities 32,979 — 32,979 — Accrued interest receivable on loans 70,344 — — 70,344 FHLB stock and FRB stock 153,968 — — — Swaps 105,772 — 105,772 — Financial liabilities: Non-maturity deposits 22,083,776 22,083,776 — — Certificates of deposit 1,757,942 — 1,758,273 — Other borrowings 31,679 — 31,679 — Subordinated Notes - Bank 143,757 — 145,000 — Subordinated Notes - Company 492,063 — 496,330 — Mortgage escrow funds 82,245 — 82,245 — Accrued interest payable on deposits 597 — 597 — Accrued interest payable on borrowings 10,234 — 10,234 — Swaps 45,233 — 45,233 — The following is a summary of the carrying amounts and estimated fair value of financial assets and liabilities (none of which were held for trading purposes) as of December 31, 2020: December 31, 2020 Carrying Level 1 inputs Level 2 inputs Level 3 inputs Financial assets: Cash and cash equivalents $ 305,002 $ 305,002 $ — $ — Securities AFS 2,298,618 — 2,298,618 — Securities HTM 1,740,838 — 1,874,504 — Loans held for sale 11,749 — 11,749 — Portfolio loans, net 21,522,309 — — 21,791,489 Accrued interest receivable on securities 26,508 — 26,508 — Accrued interest receivable on loans 70,997 — — 70,997 FHLB stock and FRB stock 166,190 — — — Swaps 149,797 — 149,797 — Financial liabilities: Non-maturity deposits 21,122,692 21,122,692 — — Certificates of deposit 1,996,830 — 2,002,702 — FHLB borrowings 382,000 — 382,000 — Other borrowings 304,101 — 304,101 — Subordinated Notes - Bank 143,703 — 145,870 — Subordinated Notes - Company 491,910 — 506,497 — Mortgage escrow funds 59,686 — 59,686 — Accrued interest payable on deposits 1,068 — 1,068 — Accrued interest payable on borrowings 3,425 — 3,425 — Swaps 60,004 — 60,004 —

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Components of accumulated other comprehensive income were as follows as of the dates shown below: March 31, December 31, 2021 2020 Net unrealized holding gain on available for sale securities $ 80,878 $ 115,523 Related income tax expense (22,355) (31,931) Available for sale securities, net of tax 58,523 83,592 Net unrealized holding loss on securities transferred to held to maturity (303) (348) Related income tax benefit 84 96 Securities transferred to held to maturity, net of tax (219) (252) Net unrealized holding (loss) gain on retirement plans (985) 2,040 Related income tax benefit (expense) 272 (564) Retirement plans, net of tax (713) 1,476 Accumulated other comprehensive income $ 57,591 $ 84,816 The following table presents the changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the three months ended March 31, 2021 and 2020: Net unrealized holding gain on available for sale securities Net unrealized holding (loss) on securities transferred to held to maturity Net unrealized holding (loss) gain on retirement plans Total For the three months ended March 31, 2021 Balance beginning of the period $ 83,592 $ (252) $ 1,476 $ 84,816 Other comprehensive (loss) before reclassification (24,549) — — (24,549) Amounts reclassified from AOCI (520) 33 (2,189) (2,676) Total other comprehensive (loss) income (25,069) 33 (2,189) (27,225) Balance at end of period $ 58,523 $ (219) $ (713) $ 57,591 For the three months ended March 31, 2020 Balance beginning of the period $ 38,056 $ (538) $ 2,698 $ 40,216 Other comprehensive income before reclassification 35,280 — — 35,280 Amounts reclassified from AOCI (6,087) 70 (1,858) (7,875) Total other comprehensive income (loss) 29,193 70 (1,858) 27,405 Balance at end of period $ 67,249 $ (468) $ 840 $ 67,621 Location in consolidated income statements where reclassification from accumulated other comprehensive loss is included Net gain (loss) on sale of securities Interest income on securities Other non-interest expense

Recently Issued Accounting Stan

Recently Issued Accounting Standards Not Yet Adopted	3 Months Ended
	Mar. 31, 2021
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Standards Not Yet Adopted	Recently Issued Accounting Standards 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. Subject to certain conditions, where an agreement, contract or transaction is modified in connection with the reference rate reform, the guidance permits: (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 remeasurements 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. We 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 optional expedients are 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. We anticipate this ASU will simplify any LIBOR transition related modifications we execute between the selected start date (yet to be determined) and December 31, 2022 by allowing prospective recognition of the continuation of the contract. We are evaluating the impacts of this ASU and have not yet determined whether the LIBOR transition and our adoption of this ASU will have a material effect on our business operations and consolidated financial statements. ASU No. 2021-01, “Reference Rate Reform (Topic 848): Scope.” (“ASU 2021-01”) clarifies that all derivative instruments affected by changes to the interest rates used for discounting, margining or contract price alignment due to reference rate reform are in the scope of ASC 848. Entities may apply certain optional expedients in ASC 848 to derivative instruments that do not reference LIBOR or another rate expected to be discontinued as a result of reference rate reform if there is a change to the interest rate used for discounting, margining or contract price alignment. ASU 2021-01 also clarifies other aspects of ASC 848 and provides new guidance on how to address the effects of the cash compensation adjustment that is provided as part of the above change on certain aspects of hedge accounting. ASU 2021-01 is effective upon issuance and generally can be applied through December 31, 2022, similar to the rest of the relief provided under ASC 848. As we currently do not utilize hedge accounting, the guidance on hedge accounting is not expected to have a material effect on our business operations and consolidated financial statements.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Announcement of Definitive Merger Agreement. On April 19, 2021, Webster Financial Corporation (NYSE: WBS) (“Webster”), the parent company of Webster Bank, National Association, and Sterling, the parent company of the Bank, jointly announced that, on April 18, 2021, they entered into a definitive agreement (the “Merger Agreement”) under which the companies will combine in an all stock merger of equals. Under the terms of the Merger Agreement, Sterling stockholders will receive 0.463 of a share of Webster common stock for each share of Sterling common stock they own. The legal and accounting acquirer will be Webster. At close, Webster stockholders will own approximately 50.4% and Sterling stockholders will own approximately 49.6% of the combined company. Each outstanding share of Sterling’s Non-Cumulative Perpetual Preferred Stock, Series A, will be converted into the right to receive one share of a newly created series of preferred stock of Webster with substantially identical terms. The Merger Agreement contains customary representations, warranties and covenants, including non-solicitation obligations and other provisions and includes a breakup fee of $185.0 million payable in certain circumstances. The Merger Agreement also provides certain termination rights for Sterling and Webster, including among others, if the merger has not been completed by April 18, 2022. The Board of Directors of the combined company will consist of 15 directors, eight directors from Webster and seven directors from Sterling, including Jack Kopnisky, Sterling’s Chief Executive Officer, who will become Executive Chairman of Webster. The combined company will operate under the Webster name and will be headquartered in Stamford, CT, while maintaining significant operations in Connecticut, New York, New Jersey, Massachusetts, Rhode Island, Wisconsin, Texas and Michigan. At close, the pro forma organization will hold approximately $63 billion in assets, $42 billion in net loans, and $52 billion in deposits. The merger is expected to close in the fourth quarter of 2021, subject to satisfaction of customary closing conditions, including receipt of regulatory approvals and approval by the stockholders of each company. Change in New York Corporate Franchise Tax Rate. On April 19, 2021, in connection with the enactment of the fiscal year 2022 New York Budget, the corporate franchise tax rate, which we are subject to, increased from 6.5% to 7.25% for the three year period beginning January 1, 2021 through December 31, 2023. We currently anticipate the impact of this rate increase will not be material to our effective income tax rate in 2021. Repayment of Subordinated Notes - Bank. On April 1, 2021, we redeemed the remaining balance of subordinated notes - Bank outstanding. See Note 7. “Borrowings” for more detail.

Basis of Financial Statement _2

Basis of Financial Statement Presentation and Summary of Significant Accounting Policies - (Policies)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements in this Quarterly Report on Form 10-Q include the accounts of the Company and all other entities in which the Company has a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation. The accounting and financial reporting policies the Company follows conform, in all material respects, to accounting principles generally accepted in the United States (“GAAP”) and to general practices within the banking industry, which include regulatory reporting instructions. The consolidated financial statements in this Quarterly Report on Form 10-Q have not been audited by an independent registered public accounting firm, but, in the opinion of management, reflect all adjustments necessary for a fair presentation of our financial position and results of operations. All such adjustments were of a normal and recurring nature. The consolidated financial statements have been prepared in accordance with GAAP and with the instructions to Form 10-Q adopted by the Securities and Exchange Commission (the “SEC”). Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2020, included in our Annual Report on Form 10-K, as filed with the SEC on February 26, 2021 (the “2020 Form 10-K”). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. Certain items in prior financial statements have been reclassified to conform to the current presentation. These reclassifications had no impact on previously reported net income.
Use of Estimates	Use of EstimatesThe preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, income, expense and contingencies at the date of the financial statements. Actual results could differ significantly from these estimates, particularly the allowance for credit losses and the status of contingencies, and are subject to change.
Allowance for Credit Loss	Credit Quality Indicators As part of the ongoing monitoring of the credit quality of our loan portfolio, management tracks certain credit quality indicators, including trends related to: (i) the weighted-average risk grade of commercial loans; (ii) the level of classified commercial loans; (iii) the delinquency status of residential mortgage and consumer loans, including home equity lines of credit (“HELOC”) and other consumer loans; (iv) net charge-offs; (v) non-performing loans (see details above); and (vi) the general economic conditions in the New York Metro Market. We analyze loans individually by classifying the loans by credit risk, except residential mortgage loans, HELOC and other consumer loans, which are evaluated on a homogeneous pool basis unless the loan balance is greater than $750 thousand. This analysis is performed at least quarterly on all graded 7-Special Mention and lower loans. We use the following definitions of risk ratings: 1 and 2 - These grades include loans that are secured by cash, marketable securities or cash surrender value of life insurance policies. 3 - This grade includes loans to borrowers with strong earnings and cash flow that have the ability to service debt. The borrower’s assets and liabilities are generally well-matched and are above average quality. The borrower has ready access to multiple sources of funding, including alternatives such as term loans, private equity placements or trade credit. 4 - This grade includes loans to borrowers with above average cash flow, adequate earnings and debt service coverage ratios. The borrower generates discretionary cash flow, assets and liabilities are reasonably matched, and the borrower has access to other sources of debt funding or additional trade credit at market rates. 5 - This grade includes loans to borrowers with adequate earnings and cash flow and reasonable debt service coverage ratios. Overall leverage is acceptable and there is average reliance upon trade credit. Management has a reasonable amount of experience and depth, and owners are willing to invest available outside capital, as necessary. 6 - This grade includes loans to borrowers where there is evidence of some strain, earnings are inconsistent and volatile, and the borrowers’ outlook is uncertain. Generally, such borrowers have higher leverage than those with a better risk rating. These borrowers typically have limited access to alternative sources of bank debt and may be dependent upon debt funding for working capital support. 7 - Special Mention (OCC definition) - Other Assets Especially Mentioned are loans that have potential weaknesses which may, if not reversed or corrected, weaken the asset or inadequately protect the Bank’s credit position at some future date. Such assets constitute an undue and unwarranted credit risk but not to the point of justifying a classification of “Substandard.” The credit risk may be relatively minor yet constitute an unwarranted risk in light of the circumstances surrounding a specific asset. 8 - Substandard (OCC definition) - These loans are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Assets so classified must have a well-defined weakness that jeopardizes the liquidation of the debt. They are characterized by the distinct possibility that the Bank will sustain some losses if the deficiencies are not corrected. Loss potential, while existing in the aggregate amount of substandard assets, does not have to exist in individual assets classified as substandard. 9 - Doubtful (OCC definition) - These loans have all the weakness inherent in one classified as “Substandard” with the added characteristics that the weakness makes collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. The possibility of loss is extremely high, but, because of certain important and reasonably specific pending factors which may work to the advantage and strengthening of the asset, its classification as an estimated loss is deferred until its more exact status may be determined. Pending factors may include a proposed merger, acquisition, liquidating procedures, capital injection, perfecting liens or additional collateral and refinancing plans. 10 - Loss (OCC definition) - These loans are charged-off because they are determined to be uncollectible and unbankable assets. This classification does not indicate that the asset has no absolute recovery or salvage value, but rather it is not practical or desirable to defer writing-off this asset even though partial recovery may be effected in the future. Losses should be taken in the period in which they are determined to be uncollectible.
Fair Value Measurement	Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets and liabilities that the reporting entity has the ability to access at the measurement date. Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risk, etc.) or inputs that are derived principally from, or corroborated by, market data by correlation or other means. Level 3 Inputs – Unobservable inputs for determining the fair value of assets or liabilities that reflect an entity’s own assumptions about the assumptions that market participants would use in pricing the assets or liabilities. In general, fair value is based on quoted market prices, when available. If quoted market prices in active markets are not available, fair value is based on internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and our creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. Our valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes its valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and therefore, estimates of fair value after the balance sheet date may differ significantly from the amounts presented herein. A more detailed description of the valuation methodologies used for assets and liabilities measured at fair value is set forth below. Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincide with our monthly and/or quarterly valuation process. AFS Investment Securities The majority of our available for sale investment securities are reported at fair value utilizing Level 2 inputs. For these securities, we obtain fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the securities’ terms and conditions, among other things. We review the prices supplied by the independent pricing service, as well as their underlying pricing methodologies, for reasonableness and to ensure such prices are aligned with traditional pricing matrices. In general, we do not purchase investment securities that have a complicated structure. Our entire portfolio consists of traditional investments, nearly all of which are mortgage pass-through securities, state and municipal general obligation or revenue bonds, U.S. agency bullet and callable securities and corporate bonds. Pricing for such instruments is fairly generic and is easily obtained. From time to time, we validate, on a sample basis, prices supplied by the independent pricing service by comparison to prices obtained from third-party sources or derived using internal models. As of March 31, 2021, management did not believe any of our securities are other-than-temporarily-impaired; however, management reviews all of our securities on at least a quarterly basis to assess whether impairment, if any, is other than temporary. Derivatives
Adoption of New Accounting Standards and Recently Issued Accounting Standards Not Yet Adopted	Recently Issued Accounting Standards 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. Subject to certain conditions, where an agreement, contract or transaction is modified in connection with the reference rate reform, the guidance permits: (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 remeasurements 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. We 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 optional expedients are 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. We anticipate this ASU will simplify any LIBOR transition related modifications we execute between the selected start date (yet to be determined) and December 31, 2022 by allowing prospective recognition of the continuation of the contract. We are evaluating the impacts of this ASU and have not yet determined whether the LIBOR transition and our adoption of this ASU will have a material effect on our business operations and consolidated financial statements. ASU No. 2021-01, “Reference Rate Reform (Topic 848): Scope.” (“ASU 2021-01”) clarifies that all derivative instruments affected by changes to the interest rates used for discounting, margining or contract price alignment due to reference rate reform are in the scope of ASC 848. Entities may apply certain optional expedients in ASC 848 to derivative instruments that do not reference LIBOR or another rate expected to be discontinued as a result of reference rate reform if there is a change to the interest rate used for discounting, margining or contract price alignment. ASU 2021-01 also clarifies other aspects of ASC 848 and provides new guidance on how to address the effects of the cash compensation adjustment that is provided as part of the above change on certain aspects of hedge accounting. ASU 2021-01 is effective upon issuance and generally can be applied through December 31, 2022, similar to the rest of the relief provided under ASC 848. As we currently do not utilize hedge accounting, the guidance on hedge accounting is not expected to have a material effect on our business operations and consolidated financial statements.

Securities - (Tables)

Securities - (Tables)	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Summary of securities available for sale	The following table summarizes our securities as of March 31, 2021, including a summary of the amortized cost fair value and allowance for credit losses related to HTM securities and the amortized cost, fair value of AFS securities. The terms “MBS” refers to mortgage-backed securities and the term “CMOs” refers to collateralized mortgage obligations. Both of these terms are further defined in Note 15. “Fair Value Measurements”: March 31, 2021 Available for Sale Held to Maturity Amortized Gross Gross Fair Amortized Gross Gross Fair Allowance for credit losses Residential MBS: Agency-backed $ 832,665 $ 33,917 $ (1,789) $ 864,793 $ 87,645 $ 3,013 $ — $ 90,658 $ — CMOs/Other MBS 302,349 12,403 — 314,752 — — — — — Total residential MBS 1,135,014 46,320 (1,789) 1,179,545 87,645 3,013 — 90,658 — Other securities: US Treasury and federal agencies 340,074 4,898 (1,500) 343,472 24,844 687 — 25,531 — Corporate 594,845 25,200 (7,121) 612,924 19,837 868 — 20,705 80 State and municipal 373,860 15,232 (362) 388,730 1,568,209 103,435 (58) 1,671,586 1,374 Other — — — — 17,750 173 (171) 17,752 45 Total other securities 1,308,779 45,330 (8,983) 1,345,126 1,630,640 105,163 (229) 1,735,574 1,499 Total securities $ 2,443,793 $ 91,650 $ (10,772) $ 2,524,671 $ 1,718,285 $ 108,176 $ (229) $ 1,826,232 $ 1,499 A summary of amortized cost and estimated fair value of securities as of December 31, 2020 is presented below: December 31, 2020 Available for Sale Held to Maturity Amortized Gross Gross Fair Amortized Gross Gross Fair Allowance for credit losses Residential MBS: Agency-backed $ 873,358 $ 44,911 $ (9) $ 918,260 $ 104,329 $ 4,100 $ — $ 108,429 $ — CMOs/Other MBS 352,473 20,811 — 373,284 — — — — — Total residential MBS 1,225,831 65,722 (9) 1,291,544 104,329 4,100 — 108,429 — Other securities: Federal agencies 149,852 6,615 — 156,467 24,811 844 — 25,655 — Corporate 438,226 27,334 (2,048) 463,512 19,851 535 — 20,386 75 State and municipal 369,186 18,090 (181) 387,095 1,575,596 126,575 (69) 1,702,102 1,379 Other — — — — 17,750 189 (7) 17,932 45 Total other securities 957,264 52,039 (2,229) 1,007,074 1,638,008 128,143 (76) 1,766,075 1,499 Total securities $ 2,183,095 $ 117,761 $ (2,238) $ 2,298,618 $ 1,742,337 $ 132,243 $ (76) $ 1,874,504 $ 1,499
Summary of securities held-to-maturity	The following table summarizes our securities as of March 31, 2021, including a summary of the amortized cost fair value and allowance for credit losses related to HTM securities and the amortized cost, fair value of AFS securities. The terms “MBS” refers to mortgage-backed securities and the term “CMOs” refers to collateralized mortgage obligations. Both of these terms are further defined in Note 15. “Fair Value Measurements”: March 31, 2021 Available for Sale Held to Maturity Amortized Gross Gross Fair Amortized Gross Gross Fair Allowance for credit losses Residential MBS: Agency-backed $ 832,665 $ 33,917 $ (1,789) $ 864,793 $ 87,645 $ 3,013 $ — $ 90,658 $ — CMOs/Other MBS 302,349 12,403 — 314,752 — — — — — Total residential MBS 1,135,014 46,320 (1,789) 1,179,545 87,645 3,013 — 90,658 — Other securities: US Treasury and federal agencies 340,074 4,898 (1,500) 343,472 24,844 687 — 25,531 — Corporate 594,845 25,200 (7,121) 612,924 19,837 868 — 20,705 80 State and municipal 373,860 15,232 (362) 388,730 1,568,209 103,435 (58) 1,671,586 1,374 Other — — — — 17,750 173 (171) 17,752 45 Total other securities 1,308,779 45,330 (8,983) 1,345,126 1,630,640 105,163 (229) 1,735,574 1,499 Total securities $ 2,443,793 $ 91,650 $ (10,772) $ 2,524,671 $ 1,718,285 $ 108,176 $ (229) $ 1,826,232 $ 1,499 A summary of amortized cost and estimated fair value of securities as of December 31, 2020 is presented below: December 31, 2020 Available for Sale Held to Maturity Amortized Gross Gross Fair Amortized Gross Gross Fair Allowance for credit losses Residential MBS: Agency-backed $ 873,358 $ 44,911 $ (9) $ 918,260 $ 104,329 $ 4,100 $ — $ 108,429 $ — CMOs/Other MBS 352,473 20,811 — 373,284 — — — — — Total residential MBS 1,225,831 65,722 (9) 1,291,544 104,329 4,100 — 108,429 — Other securities: Federal agencies 149,852 6,615 — 156,467 24,811 844 — 25,655 — Corporate 438,226 27,334 (2,048) 463,512 19,851 535 — 20,386 75 State and municipal 369,186 18,090 (181) 387,095 1,575,596 126,575 (69) 1,702,102 1,379 Other — — — — 17,750 189 (7) 17,932 45 Total other securities 957,264 52,039 (2,229) 1,007,074 1,638,008 128,143 (76) 1,766,075 1,499 Total securities $ 2,183,095 $ 117,761 $ (2,238) $ 2,298,618 $ 1,742,337 $ 132,243 $ (76) $ 1,874,504 $ 1,499 Continuous unrecognized loss position Less than 12 months 12 months or longer Total Fair Unrecognized losses Fair Unrecognized losses Fair Unrecognized losses HTM March 31, 2021 Other securities: State and municipal $ — $ — $ 3,910 $ (58) $ 3,910 $ (58) Other 4,829 (171) — — 4,829 (171) Total securities $ 4,829 $ (171) $ 3,910 $ (58) $ 8,739 $ (229) December 31, 2020 Residential MBS: Agency-backed $ — $ — $ — $ — $ — $ — Other securities: State and municipal 105 (1) 4,386 (68) 4,491 (69) Other 9,993 (7) — — 9,993 (7) Total other securities 10,098 (8) 4,386 (68) 14,484 (76) Total securities $ 10,098 $ (8) $ 4,386 $ (68) $ 14,484 $ (76)
Summary of amortized cost and fair value of investment securities available for sale by remaining period to contractual maturity	The amortized cost and estimated fair value of securities at March 31, 2021 are presented below by contractual maturity. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Residential MBS are shown separately since they are not due at a single maturity date. March 31, 2021 Available for sale Held to maturity Amortized Fair Amortized Fair Remaining period to contractual maturity: One year or less $ 1,930 $ 1,929 $ 23,767 $ 24,114 One to five years 321,730 332,513 84,722 88,811 Five to ten years 603,636 624,601 392,685 417,633 Greater than ten years 381,483 386,083 1,129,466 1,205,016 Total securities with a stated maturity date 1,308,779 1,345,126 1,630,640 1,735,574 Residential MBS 1,135,014 1,179,545 87,645 90,658 Total securities $ 2,443,793 $ 2,524,671 $ 1,718,285 $ 1,826,232
Sale of securities	Sales and calls of securities for the periods indicated below were as follows: For the three months ended March 31, 2021 2020 Available for sale: Proceeds from sales $ 20,706 $ 407,524 Gross realized gains 1,236 8,480 Gross realized losses (530) (68) Income tax expense on realized net gains 131 1,472 Proceeds from calls $ 2,950 $ 139,777 Gross realized gains 31 4,909 Gross realized losses (18) (29) Income tax expense on realized net gains 2 854
Securities available for sale with unrealized losses, by length of time in continuous unrealized loss position	The following table summarizes AFS securities with unrealized losses in an unrealized loss position for which an ACL has not been recorded at March 31, 2021 and December 31, 2020 aggregated by major security type and length of time in a continuous unrealized loss position: Continuous unrealized loss position Less than 12 months 12 months or longer Total Fair Unrealized losses Fair Unrealized losses Fair Unrealized losses AFS March 31, 2021 Residential MBS: Agency-backed $ 48,576 $ (1,781) $ 276 $ (8) $ 48,852 $ (1,789) Other securities: US Treasury and federal agencies 208,506 (1,500) — — 208,506 (1,500) Corporate 187,172 (7,121) — — 187,172 (7,121) State and municipal 24,361 (195) 10,706 (167) 35,067 (362) Total other securities 420,039 (8,816) 10,706 (167) 430,745 (8,983) Total securities $ 468,615 $ (10,597) $ 10,982 $ (175) $ 479,597 $ (10,772) December 31, 2020 Residential MBS: Agency-backed $ 396 $ (1) $ 1,970 $ (8) $ 2,366 $ (9) Other securities: Corporate 83,191 (2,048) — — 83,191 (2,048) State and municipal 2,507 (29) 10,872 (152) 13,379 (181) Total other securities 85,698 (2,077) 10,872 (152) 96,570 (2,229) Total securities $ 86,094 $ (2,078) $ 12,842 $ (160) $ 98,936 $ (2,238)
Schedule of debt securities held-for-sale allowance for credit loss rollforward	The following table presents the activity in the ACL - HTM securities by type of security for the three month periods ended March 31, 2021 and 2020: March 31, 2021 March 31, 2020 Type of security Type of security Corporate and Other State and municipal Corporate and Other State and municipal ACL - HTM: Balance at beginning of period $ 120 $ 1,379 $ — $ — Impact of adoption on January 1, 2020 — — 108 688 Provision for credit loss expense 5 (5) 7 1,696 Total ACL - HTM at end of period $ 125 $ 1,374 $ 115 $ 2,384
Schedule of debt securities held-for-sale amortized cost by credit quality indicator	The following table summarizes the amortized cost of HTM securities at March 31, 2021 aggregated by credit quality indicator: Credit Rating: Corporate and other State and municipal AAA $ — $ 991,273 AA 17,750 550,395 A — 20,522 BBB — 64 Non-rated 19,837 5,955 Total $ 37,587 $ 1,568,209
Securities pledged for borrowings at FHLB and other institutions, and securities pledged for municipal deposits and other purposes	Securities pledged for borrowings at the FHLB and other institutions, and securities pledged for municipal deposits and other purposes, were as follows for the periods presented below: March 31, December 31, 2021 2020 AFS securities pledged for borrowings, at fair value $ 31,679 $ 27,101 AFS securities pledged for municipal deposits, at fair value 611,646 569,724 HTM securities pledged for municipal deposits, at amortized cost 1,512,763 1,221,964 Total securities pledged $ 2,156,088 $ 1,818,789

Portfolio Loans - (Tables)

Portfolio Loans - (Tables)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Components of loan portfolio excluding loans held for sale	The composition of our total portfolio loans, which excludes loans held for sale, was the following for the periods presented below: March 31, 2021 December 31, 2020 Commercial: Commercial & Industrial (“C&I”): Traditional C&I $ 2,886,336 $ 2,920,205 Asset-based lending 693,015 803,004 Payroll finance 153,987 159,237 Warehouse lending 1,394,945 1,953,677 Factored receivables 229,629 220,217 Equipment financing 1,475,716 1,531,109 Public sector finance 1,617,986 1,572,819 Total C&I 8,451,614 9,160,268 Commercial mortgage: Commercial real estate (“CRE”) 6,029,282 5,831,990 Multi-family 4,391,850 4,406,660 Acquisition, development and construction (“ADC”) 618,295 642,943 Total commercial mortgage 11,039,427 10,881,593 Total commercial 19,491,041 20,041,861 Residential mortgage 1,486,597 1,616,641 Consumer 174,335 189,907 Total portfolio loans 21,151,973 21,848,409 Allowance for credit losses (323,186) (326,100) Total portfolio loans, net $ 20,828,787 $ 21,522,309
Schedule of amounts and status of loans and TDRs	Portfolio loans: An analysis of the aging of portfolio loans, segregated by loan type as of March 31, 2021, is presented below: March 31, 2021 Current 30-59 60-89 90+ Total Traditional C&I $ 2,865,977 $ 2,659 $ 997 $ 16,703 $ 2,886,336 Asset-based lending 693,015 — — — 693,015 Payroll finance 153,987 — — — 153,987 Warehouse lending 1,394,945 — — — 1,394,945 Factored receivables 229,629 — — — 229,629 Equipment financing 1,449,419 2,975 2,526 20,796 1,475,716 Public sector finance 1,617,986 — — — 1,617,986 CRE 6,012,339 4,057 10,079 2,807 6,029,282 Multi-family 4,377,043 14,026 3 778 4,391,850 ADC 593,295 — — 25,000 618,295 Residential mortgage 1,462,169 7,381 2,702 14,345 1,486,597 Consumer 163,360 1,229 398 9,348 174,335 Total loans $ 21,013,164 $ 32,327 $ 16,705 $ 89,777 $ 21,151,973 Total TDRs included above $ 74,064 $ — $ 490 $ 1,892 $ 76,446 Non-performing loans: Loans 90+ days past due and still accruing $ 2 Non-accrual loans 168,555 Total non-performing loans $ 168,557 The following table represents an analysis of the aging of portfolio loans, segregated by loan type as of: December 31, 2020 Current 30-59 60-89 90+ Total Traditional C&I $ 2,905,964 $ 1,215 $ 6,054 $ 6,972 $ 2,920,205 Asset-based lending 803,004 — — — 803,004 Payroll finance 159,237 — — — 159,237 Warehouse lending 1,953,677 — — — 1,953,677 Factored receivables 220,217 — — — 220,217 Equipment financing 1,469,653 24,286 11,077 26,093 1,531,109 Public sector finance 1,572,819 — — — 1,572,819 CRE 5,794,115 13,591 17,421 6,863 5,831,990 Multi-family 4,393,950 11,578 811 321 4,406,660 ADC 612,943 — — 30,000 642,943 Residential mortgage 1,590,068 7,444 3,426 15,703 1,616,641 Consumer 178,587 1,043 907 9,370 189,907 Total loans $ 21,654,234 $ 59,157 $ 39,696 $ 95,322 $ 21,848,409 Total TDRs included above $ 60,257 $ 2,927 $ 13,492 $ 2,295 $ 78,971 Non-performing loans: Loans 90+ days past due and still accruing $ 170 Non-accrual loans 166,889 Total non-performing loans $ 167,059
Schedule of collateral-dependent financing receivables	The following table presents the amortized cost basis of collateral-dependent loans by loan type and collateral as of March 31, 2021: Collateral type Real estate Business assets Equipment Taxi medallions Total Traditional C&I $ 412 $ 24,781 $ 5,428 $ 7,376 $ 37,997 Asset-based lending — 13,264 — — 13,264 Payroll finance — 2,313 — — 2,313 Equipment finance — 1,885 13,366 — 15,251 CRE 36,114 — — — 36,114 Multi-family 7,725 — — — 7,725 ADC 25,000 — — — 25,000 Residential mortgage 6,214 — — — 6,214 Consumer 6,093 — — — 6,093 Total $ 81,558 $ 42,243 $ 18,794 $ 7,376 $ 149,971 Collateral-dependent loans include all loans that were TDRs at March 31, 2021. In the table above, $123.1 million of the total loans were on non-accrual at March 31, 2021. Business assets that secure traditional C&I and asset-based lending loans generally include accounts receivable, inventory, machinery and equipment. There were no warehouse lending, factored receivables or public sector finance loans that were collateral-dependent at March 31, 2021. The following table presents the amortized cost basis of collateral-dependent loans by loan type and collateral as of December 31, 2020: Collateral type Real estate Business assets Equipment Taxi medallions Total Traditional C&I $ 425 $ — $ 5,998 $ 10,916 $ 17,339 Asset-based lending — 8,280 — — 8,280 Payroll finance — 2,300 — — 2,300 Equipment finance — 1,117 10,461 — 11,578 CRE 53,212 — — — 53,212 Multi-family 9,914 — — — 9,914 ADC 30,000 — — — 30,000 Residential mortgage 5,025 — — — 5,025 Consumer 7,384 — — — 7,384 Total $ 105,960 $ 11,697 $ 16,459 $ 10,916 $ 145,032
Schedule of additional analysis of non-accrual loans	The following table provides additional information on our non-accrual loans and loans 90 days past due: March 31, 2021 December 31, 2020 Total Non-accrual Loans Non-accrual loans with no ACL Loans 90 days or more past due still accruing interest Total Non-accrual Loans Non-accrual loans with no ACL Loans 90 days or more past due still accruing interest Traditional C&I $ 50,351 $ 12,804 $ — $ 19,223 $ 16,914 $ 94 Asset-based lending 10,149 5,789 — 5,255 4,613 — Payroll finance 2,313 2,313 — 2,300 2,300 — Equipment financing 28,868 15,252 2 30,634 11,578 2 CRE 24,269 858 — 46,053 38,529 74 Multi-family 778 — — 4,485 2,156 — ADC 25,000 — — 30,000 — — Residential mortgage 17,081 3,264 — 18,661 808 — Consumer 9,746 775 — 10,278 875 — Total $ 168,555 $ 41,055 $ 2 $ 166,889 $ 77,773 $ 170
Schedule of accrued interest receivable reversed against interest income	The following table provides information on accrued interest receivable that was reversed against interest income for the three months ended March 31, 2021 and March 31, 2020: For the three months ended March 31, 2021 2020 Traditional C&I $ 36 $ 7 Asset-based lending — 67 Equipment financing 38 — CRE 7 146 Multi-family — 27 ADC — 297 Residential mortgage 173 80 Consumer 19 7 Total interest reversed $ 273 $ 631
Schedule of financing receivable payment deferrals	The table below reflects the balance of deferrals by portfolio: Non-pass rated loans Loan balance outstanding Deferral of principal and interest % Special mention Substandard Commercial C&I: Traditional C&I $ 2,886,336 $ — — % $ — $ — Asset-based lending 693,015 — — — — Payroll finance 153,987 — — — — Warehouse lending 1,394,945 — — — — Factored receivables 229,629 — — — — Equipment finance 1,475,716 3,143 0.2 — 2,297 Public sector finance 1,617,986 — — — — Total C&I 8,451,614 3,143 — — 2,297 Commercial mortgage: Commercial real estate 6,029,282 40,583 0.7 13,399 26,584 Multi-family 4,391,850 4,564 0.1 — — ADC 618,295 — — — — Total commercial mortgage 11,039,427 45,147 0.4 13,399 26,584 Total commercial 19,491,041 48,290 0.2 13,399 28,881 Residential 1,486,597 78,059 5.3 — 355 Consumer 174,335 4,176 2.4 — — Total Portfolio loans $ 21,151,973 $ 130,525 0.6 % $ 13,399 $ 29,236
Troubled debt restructurings	The following table presents loans classified as TDRs during the first three months of 2021 and 2020 broken down by segment: March 31, 2021 March 31, 2020 Recorded investment Recorded investment Number Pre- Post- Number Pre- Post- Asset-based lending $ — $ — 1 $ 4,943 $ 4,943 Total TDRs — $ — $ — 1 $ 4,943 $ 4,943

Allowance for Credit Losses -_2

Allowance for Credit Losses - Loans - (Tables)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Allowance for loan losses activity	Activity in our ACL - loans for the three months ended March 31, 2021 and March 31, 2020 is summarized in the table below: For the three months ended March 31, 2021 Beginning Charge-offs Recoveries Net Provision / (credit) Ending balance Traditional C&I $ 42,670 $ (1,027) $ 468 $ (559) $ 4,282 $ 46,393 Asset-based lending 12,762 — — — (1,597) 11,165 Payroll finance 1,957 — 2 2 (440) 1,519 Warehouse lending 1,724 — — — (492) 1,232 Factored receivables 2,904 (4) 406 402 (69) 3,237 Equipment financing 31,794 (2,408) 854 (1,554) (2,215) 28,025 Public sector finance 4,516 — — — 116 4,632 CRE 155,313 (2,933) 487 (2,446) 6,555 159,422 Multi-family 33,320 (3,230) — (3,230) 3,286 33,376 ADC 17,927 (5,000) — (5,000) 876 13,803 Residential mortgage 16,529 (267) 37 (230) (329) 15,970 Consumer 4,684 (391) 92 (299) 27 4,412 Total ACL - loans $ 326,100 $ (15,260) $ 2,346 $ (12,914) $ 10,000 $ 323,186 Annualized net charge-offs to average loans outstanding: 0.25 % For the three months ended March 31, 2020 Beginning CECL Day 1 Charge-offs Recoveries Net Provision / (credit) Ending balance Traditional C&I $ 15,951 $ 5,325 $ (298) $ 475 $ 177 $ 13,836 $ 35,289 Asset-based lending 14,272 11,973 (985) — (985) 1,230 26,490 Payroll finance 2,064 1,334 — 9 9 323 3,730 Warehouse lending 917 (362) — — — (266) 289 Factored receivables 654 795 (7) 4 (3) 7,748 9,194 Equipment financing 16,723 33,000 (4,793) 1,105 (3,688) 13,993 60,028 Public sector finance 1,967 (766) — — — 728 1,929 CRE 27,965 8,037 (1,275) 60 (1,215) 62,799 97,586 Multi-family 11,440 14,906 — — — 22,751 49,097 ADC 4,732 (119) (3) 105 102 10,489 15,204 Residential mortgage 7,598 14,104 (1,072) — (1,072) 2,460 23,090 Consumer 1,955 2,357 (1,405) 1,125 (280) 486 4,518 Total ACL - loans $ 106,238 $ 90,584 $ (9,838) $ 2,883 $ (6,955) $ 136,577 $ 326,444 Annualized net charge-offs to average loans outstanding: 0.13 %
Financing receivable credit quality indicators	As of March 31, 2021 and December 31, 2020, the risk category of non-pass rated loans by segment was as follows: March 31, 2021 December 31, 2020 Special Mention Substandard Special Mention Substandard Traditional C&I $ 37,627 $ 95,527 $ 24,162 $ 84,792 Asset-based lending 92,534 13,817 111,597 11,669 Payroll finance 1,176 2,313 — 2,300 Factored receivables — — 5,523 — Equipment financing 6,323 47,527 7,737 45,018 CRE 240,770 347,393 249,403 280,796 Multi-family 114,402 31,328 61,146 44,872 ADC 1,613 25,000 1,407 30,000 Residential mortgage — 17,368 468 18,942 Consumer 7 9,836 15 10,371 Total $ 494,452 $ 590,109 $ 461,458 $ 528,760 Term loans amortized cost basis by origination year Revolving loans converted to term 2021 2020 2019 2018 2017 Prior Revolving loans Total Traditional C&I Pass $ 55,876 $ 394,938 $ 202,836 $ 247,049 $ 120,169 $ 162,274 $ 1,569,746 $ — $ 2,752,888 Special mention 438 165 8,846 17,261 4,030 1,555 5,332 — 37,627 Substandard 11 1,124 37,250 18,562 6,668 10,052 21,860 — 95,527 Doubtful — — — — — — 295 — 295 Total traditional C&I 56,325 396,227 248,932 282,872 130,867 173,881 1,597,233 — 2,886,337 Asset-Based Loans Pass 12,108 45,326 27,339 5,451 10,212 58,968 427,260 — 586,664 Special mention — — 738 9,477 13,753 — 68,566 — 92,534 Substandard — — — — — 553 13,264 — 13,817 Total asset-based lending 12,108 45,326 28,077 14,928 23,965 59,521 509,090 — 693,015 Payroll Finance Pass — — 8,014 — — — 142,484 — 150,498 Special mention — — — — — — 1,176 — 1,176 Substandard — — — — — — 2,313 — 2,313 Total payroll finance — — 8,014 — — — 145,973 — 153,987 Warehouse Lending Pass 41,469 112,045 41,103 53,592 236,757 909,979 — — 1,394,945 Special mention — — — — — — — — — Substandard — — — — — — — — — Total warehouse lending 41,469 112,045 41,103 53,592 236,757 909,979 — — 1,394,945 Factored Receivables Pass — — — — — — 229,629 — 229,629 Total factored receivables — — — — — — 229,629 — 229,629 Equipment Financing Pass 82,999 408,641 498,484 224,618 93,669 113,455 — — 1,421,866 Special mention — — 3,999 2,023 185 116 — — 6,323 Substandard — 12 22,254 8,631 12,422 4,208 — — 47,527 Total equipment financing 82,999 408,653 524,737 235,272 106,276 117,779 — — 1,475,716 Public Sector Finance Term loans amortized cost basis by origination year Revolving loans converted to term 2021 2020 2019 2018 2017 Prior Revolving loans Total Pass 73,774 437,123 398,280 206,591 261,963 240,255 — — 1,617,986 Total public sector finance 73,774 437,123 398,280 206,591 261,963 240,255 — — 1,617,986 CRE Pass 168,163 1,047,246 1,247,285 882,651 514,007 1,581,766 — — 5,441,118 Special mention — 8,349 111,559 19,246 54,793 46,823 — — 240,770 Substandard — 37,821 65,059 95,688 29,448 119,377 — — 347,393 Total CRE 168,163 1,093,416 1,423,903 997,585 598,248 1,747,966 — — 6,029,281 Multi-family Pass 211,873 371,457 707,272 431,720 600,632 1,855,436 67,730 — 4,246,120 Special mention — — 32,370 8,178 26,082 43,742 4,030 — 114,402 Substandard — — 10,185 — — 18,196 2,947 — 31,328 Total multi-family 211,873 371,457 749,827 439,898 626,714 1,917,374 74,707 — 4,391,850 ADC Pass 25,451 114,913 274,904 100,437 28,971 47,006 — — 591,682 Special mention — 1,613 — — — — — — 1,613 Substandard — — — — 25,000 — — — 25,000 Total ADC 25,451 116,526 274,904 100,437 53,971 47,006 — — 618,295 Residential Pass 230 10,594 11,088 31,989 40,801 1,374,527 — — 1,469,229 Substandard — — — — — 17,368 — — 17,368 Total residential 230 10,594 11,088 31,989 40,801 1,391,895 — — 1,486,597 Consumer Pass — 70 358 376 222 5,013 98,640 59,813 164,492 Special mention — — — — — — 7 — 7 Substandard — — — — — 394 3,225 6,217 9,836 Total consumer — 70 358 376 222 5,407 101,872 66,030 174,335 Total Loans $ 672,392 $ 2,991,437 $ 3,709,223 $ 2,363,540 $ 2,079,784 $ 6,611,063 $ 2,658,504 $ 66,030 $ 21,151,973

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets - (Tables)	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of goodwill and intangible assets	The balance of goodwill and other intangible assets for the periods presented were as follows: March 31, December 31, 2021 2020 Goodwill $ 1,683,482 $ 1,683,482 Other intangible assets: Core deposits $ 66,180 $ 69,808 Customer lists 3,108 3,256 Trade name 20,500 20,500 Total $ 89,788 $ 93,564
Future amortization expense	The estimated aggregate future amortization expense for intangible assets remaining as of March 31, 2021 was as follows: Amortization expense Remainder of 2021 $ 11,328 2022 13,703 2023 12,322 2024 10,448 2025 8,722 2026 7,134 Thereafter 5,631 Total $ 69,288

Deposits - (Tables)

Deposits - (Tables)	3 Months Ended
	Mar. 31, 2021
Deposits [Abstract]
Summary of major classification of deposits	Deposit balances at March 31, 2021 and December 31, 2020 were as follows: March 31, December 31, 2021 2020 Non-interest bearing demand $ 5,691,429 $ 5,443,907 Interest bearing demand 5,132,937 4,960,800 Savings 2,690,445 2,603,570 Money market 8,568,965 8,114,415 Certificates of deposit 1,757,942 1,996,830 Total deposits $ 23,841,718 $ 23,119,522
List of company's brokered deposits	Brokered deposits at March 31, 2021 and December 31, 2020 were as follows: March 31, December 31, 2021 2020 Interest bearing demand $ 399,000 $ 433,790 Money market 1,034,070 1,045,478 Certificates of deposit 151,017 100,003 Total brokered deposits $ 1,584,087 $ 1,579,271

Borrowings - (Tables)

Borrowings - (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Instruments [Abstract]
Schedule of debt	Our borrowings and weighted average interest rates were as follows for the periods presented: March 31, December 31, 2021 2020 Amount Rate Amount Rate By type of borrowing: FHLB borrowings $ — — % $ 382,000 0.35 % Repurchase agreements 31,679 0.10 27,101 0.10 Federal funds purchased — — 277,000 0.11 Subordinated Notes - Bank 143,757 5.45 143,703 5.45 Subordinated Notes - 2029 270,366 4.18 270,284 4.17 Subordinated Notes - 2030 221,697 4.06 221,626 4.06 Total borrowings $ 667,499 4.22 % $ 1,321,714 2.25 % By remaining period to maturity: Less than one year $ 31,679 0.10 % $ 686,101 0.24 % Greater than five years 635,820 4.43 635,613 4.43 Total borrowings $ 667,499 4.22 % $ 1,321,714 2.25 %

Derivatives - (Tables)

Derivatives - (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedges, Assets [Abstract]
Summary of derivatives	Summary information as of March 31, 2021 and December 31, 2020 regarding these derivatives is presented below: Notional Average Weighted Weighted Fair value March 31, 2021 Included in other assets: Third-party interest rate swap $ — $ — Customer interest rate swap 1,913,381 105,772 Total $ 1,913,381 4.29 4.42 % 1 m Libor + 2.21% $ 105,772 Included in other liabilities: Third-party interest rate swap $ 1,913,381 $ 45,233 Customer interest rate swap — — Total $ 1,913,381 4.29 4.42 % 1 m Libor + 2.21% $ 45,233 December 31, 2020 Included in other assets: Third-party interest rate swap $ — $ — Customer interest rate swap 1,913,607 149,797 Total $ 1,913,607 4.40 4.44 % 1 m Libor + 2.20% $ 149,797 Included in other liabilities: Third-party interest rate swap $ 1,913,607 $ 60,004 Customer interest rate swap — — Total $ 1,913,607 4.40 4.44 % 1 m Libor + 2.20% $ 60,004

Income Taxes - (Tables)

Income Taxes - (Tables)	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Schedule of effective income tax rate reconciliation	Actual income tax expense differs from the tax computed based on pre-tax income and the applicable statutory federal tax rate for the following reasons: For the three months ended March 31, 2021 2020 Income before income tax expense $ 122,105 $ 6,105 Tax at federal statutory rate of 21% 25,642 1,282 State and local income taxes, net of federal tax benefit 6,160 589 Tax exempt interest, net of disallowed interest (5,777) (7,409) BOLI income (1,004) (1,111) Low income housing tax credits and other benefits (13,780) (8,462) Low income housing investment amortization expense 11,507 7,401 Tax rate adjustment benefit due to CARES Act net operating loss (“NOL”) carryback — (21,313) Uncertain tax position reserve — 11,480 Annual effective tax rate adjustment — 8,248 Non-deductible compensation expense 1 640 — Equity-based stock compensation (benefit) expense (152) 491 FDIC insurance premium limitation 257 256 Other, net (538) 506 Actual income tax expense (benefit) $ 22,955 $ (8,042) Effective income tax rate 18.8 % (131.7) %
Schedule of unrecognized tax benefits roll forward	As of March 31, 2021, the accrual for unrecognized gross tax benefits was as follows: For the three months ended March 31, 2021 2020 Uncertain tax positions beginning of period $ 7,000 $ — Additions for tax positions related to prior tax years — 11,480 Decrease due to settlement — — Interest expense in tax positions — — Uncertain tax positions at end of period $ 7,000 $ 11,480

Stock-Based Compensation - (Tab

Stock-Based Compensation - (Tables)	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Summary of Company's stock option activity	The following table summarizes the activity in our stock-based compensation plan for the three months ended March 31, 2021: Non-vested stock awards/stock units outstanding Stock options outstanding Shares available for grant Number of shares Weighted average grant date fair value Number of shares Weighted average exercise price Balance at January 1, 2021 1,811,418 2,993,643 $ 19.54 336,621 $ 11.41 Granted (1,138,246) 1,138,246 20.36 — — Stock awards vested — (820,633) 21.31 — — Exercised — — — (73,946) 10.17 Forfeited 21,775 (21,775) 19.05 — — Canceled/expired 31,109 (31.109) 20.85 — — Balance at March 31, 2021 726,056 3,258,372 $ 19.37 262,675 $ 11.41 Exercisable at March 31, 2021 262,675 $ 11.41
Schedule of stock-based compensation expense associated with stock options and non-vested stock awards	Stock-based compensation expense associated with non-vested stock awards and the related income tax benefit, and proceeds from stock option exercises are presented below: For the three months ended March 31, 2021 2020 Stock options $ — $ — Non-vested stock awards/performance units 6,617 6,006 Non-vested stock awards/performance units $ 6,617 $ 6,006 Income tax benefit 1,224 1,051 Proceeds from stock option exercises 752 414

Other Non-Interest Expense, O_2

Other Non-Interest Expense, Other Assets and Other Liabilities - (Tables)	3 Months Ended
	Mar. 31, 2021
Other Income and Expenses [Abstract]
Schedule of other non-interest expense	Other non-interest expense items for the three months ended March 31, 2021 and 2020, respectively, are presented in the following table: For the three months ended March 31, 2021 2020 Other non-interest expense: Depreciation expense on operating leases $ 3,124 $ 3,492 Advertising and promotion 1,708 1,983 Communications 1,427 1,630 Residential mortgage loans servicing 1,449 1,377 Commercial loan servicing 979 1,025 Insurance & surety bond premium 914 1,091 Operational losses 593 605 Other 4,858 5,460 Total other non-interest expense $ 15,052 $ 16,663
Schedule of other assets	Other assets are presented in the following table. Significant components of the aggregate of other assets are presented separately. March 31, December 31, 2021 2020 Other assets: Low income housing tax credit investments $ 484,885 $ 488,303 Right of use asset for operating leases 101,495 105,667 Fair value of swaps 105,772 149,797 Cash on deposit as swap collateral / net of settlement 69,014 82,478 Operating leases - equipment and vehicles leased to others 51,999 55,224 Other asset balances 193,003 181,934 Total other assets $ 1,006,168 $ 1,063,403
Schedule of other liabilities	Other liabilities are presented in the following table. Significant components of the aggregate of other liabilities are presented separately. March 31, December 31, 2021 2020 Other liabilities: Commitment to fund low income housing tax credit investments $ 276,974 $ 283,849 Lease liability 109,720 113,405 Payroll finance and factoring liabilities 125,831 115,802 Swap liabilities (see Note 8) 45,233 60,004 Other liability balances 144,898 155,642 Total other liabilities $ 702,656 $ 728,702

Earnings Per Common Share - (Ta

Earnings Per Common Share - (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Computation of basic and diluted earnings per share	The following is a summary of the calculation of earnings per common share (“EPS”): For the three months ended March 31, 2021 2020 Net income available to common stockholders $ 97,187 $ 12,171 Weighted average common shares outstanding for computation of basic EPS 191,890,512 196,344,061 Common-equivalent shares due to the dilutive effect of stock options and unvested performance share grants (1) 731,395 364,977 Weighted average common shares for computation of diluted EPS 192,621,907 196,709,038 EPS (2) : Basic $ 0.51 $ 0.06 Diluted 0.50 0.06 (1) Represents incremental shares computed using the treasury stock method. (2) Anti-dilutive shares are not included in determining diluted EPS. Anti-dilutive shares were 0 and 23,590 for the three months ended March 31, 2021 and 2020, respectively.

Stockholders' Equity - (Tables)

Stockholders' Equity - (Tables)	3 Months Ended
	Mar. 31, 2021
Stockholders' Equity Note [Abstract]
Schedule of compliance with regulatory capital requirements under banking regulations	The following tables present actual and required capital ratios as of March 31, 2021 and December 31, 2020 for us and the Bank under the Basel III Capital Rules. The minimum required capital amounts presented as of March 31, 2021 and December 31, 2020 are based on the fully phased-in provisions of the Basel III Capital Rules. Capital levels required to be considered well-capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. Actual Minimum capital required - Basel III Required to be considered well- capitalized Capital amount Ratio Capital amount Ratio Capital amount Ratio March 31, 2021 Common equity tier 1 to RWA: Sterling National Bank $ 3,269,545 14.04 % $ 1,630,407 7.00 % $ 1,513,949 6.50 % Sterling Bancorp 2,786,496 11.95 1,632,817 7.00 N/A N/A Tier 1 capital to RWA: Sterling National Bank 3,269,545 14.04 % 1,979,780 8.50 % 1,863,322 8.00 % Sterling Bancorp 2,922,954 12.53 1,982,706 8.50 N/A N/A Total capital to RWA: Sterling National Bank 3,590,726 15.42 % 2,445,610 10.50 % 2,329,152 10.00 % Sterling Bancorp 3,690,353 15.82 2,449,225 10.50 N/A N/A Tier 1 leverage ratio: Sterling National Bank 3,269,545 11.76 % 1,111,894 4.00 % 1,389,867 5.00 % Sterling Bancorp 2,922,954 10.50 1,113,426 4.00 N/A N/A Actual Minimum capital required - Basel III fully phased-in Required to be considered well- capitalized Capital amount Ratio Capital amount Ratio Capital amount Ratio December 31, 2020 Common equity tier 1 to RWA: Sterling National Bank $ 3,198,145 13.38 % $ 1,673,516 7.00 % $ 1,553,979 6.50 % Sterling Bancorp 2,727,385 11.39 1,675,747 7.00 N/A N/A Tier 1 capital to RWA: Sterling National Bank 3,198,145 13.38 % 2,032,127 8.50 % 1,912,590 8.00 % Sterling Bancorp 2,864,074 11.96 2,034,836 8.50 N/A N/A Total capital to RWA: Sterling National Bank 3,521,458 14.73 % 2,510,274 10.50 % 2,390,737 10.00 % Sterling Bancorp 3,638,033 15.20 2,513,621 10.50 N/A N/A Tier 1 leverage ratio: Sterling National Bank 3,198,145 11.33 % 1,128,913 4.00 % 1,411,142 5.00 % Sterling Bancorp 2,864,074 10.14 1,130,362 4.00 N/A N/A

Commitments and Contingencies -

Commitments and Contingencies - (Tables)	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of off-balance-sheet financial instruments	The contractual or notional amounts of these instruments, which reflect the extent of our involvement in particular classes of off-balance sheet financial instruments, are summarized as follows: March 31, December 31, 2021 2020 Loan origination commitments $ 598,171 $ 641,965 Unused lines of credit 1,493,031 1,623,745 Letters of credit 175,305 181,890
Schedule of operating lease liability maturities	Future minimum payments for operating leases with initial or remaining terms of one year or more as of March 31, 2021 were as follows: Remainder of 2021 $ 13,805 2022 18,069 2023 16,605 2024 14,790 2025 12,176 2026 11,054 2027 and thereafter 39,788 Total lease payments 126,287 Interest 16,567 Present value of lease liabilities $ 109,720

Fair Value Measurements - (Tabl

Fair Value Measurements - (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Estimated fair value on a recurring basis	A summary of assets and liabilities at March 31, 2021 and December 31, 2020, respectively, measured at estimated fair value on a recurring basis, is as follows: March 31, 2021 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Assets: Investment securities available for sale: Residential MBS: Agency-backed $ 864,793 $ — $ 864,793 $ — CMOs/Other MBS 314,752 — 314,752 — Total residential MBS 1,179,545 — 1,179,545 — Other securities: Federal agencies 343,472 — 343,472 — Corporate 612,924 — 612,924 — State and municipal 388,730 — 388,730 — Total other securities 1,345,126 — 1,345,126 — Total AFS 2,524,671 — 2,524,671 — Swaps 105,772 — 105,772 — Total assets $ 2,630,443 $ — $ 2,630,443 $ — Liabilities: Swaps $ 45,233 $ — $ 45,233 $ — Total liabilities $ 45,233 $ — $ 45,233 $ — December 31, 2020 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Assets: Investment securities available for sale: Residential MBS: Agency-backed $ 918,260 $ — $ 918,260 $ — CMOs/Other MBS 373,284 — 373,284 — Total residential MBS 1,291,544 — 1,291,544 — Federal agencies 156,467 — 156,467 — Corporate 463,512 — 463,512 — State and municipal 387,095 — 387,095 — Total other securities 1,007,074 — 1,007,074 — Total AFS 2,298,618 — 2,298,618 — Swaps 149,797 — 149,797 — Total assets $ 2,448,415 $ — $ 2,448,415 $ — Liabilities: Swaps $ 60,004 $ — $ 60,004 $ — Total liabilities $ 60,004 $ — $ 60,004 $ —
Estimated fair value on nonrecurring basis	March 31, 2021 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Traditional C&I $ 7,376 $ — $ — $ 7,376 Asset-based lending 1,846 — — 1,846 Payroll finance 2,313 — — 2,313 Equipment financing 2,671 — — 2,671 CRE 25,156 — — 25,156 ADC 25,000 — — 25,000 Residential mortgage 1,307 — — 1,307 Consumer 2,451 — — 2,451 Total collateral dependent loans measured at fair value $ 68,120 $ — $ — $ 68,120 December 31, 2020 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Traditional C&I $ 10,916 $ — $ — $ 10,916 Asset-based lending 1,899 — — 1,899 Payroll finance 2,300 — — 2,300 CRE 27,323 — — 27,323 Residential mortgage 1,307 — — 1,307 Consumer 3,593 — — 3,593 Total collateral dependent loans measured at fair value $ 47,338 $ — $ — $ 47,338
Carrying amounts and estimated fair value of financial assets and liabilities	The following is a summary of the carrying amounts and estimated fair value of financial assets and liabilities (none of which were held for trading purposes) as of March 31, 2021: March 31, 2021 Carrying Level 1 inputs Level 2 inputs Level 3 inputs Financial assets: Cash and cash equivalents $ 935,633 $ 935,633 $ — $ — Securities AFS 2,524,671 — 2,524,671 — Securities HTM, net 1,716,786 — 1,826,232 — Loans held for sale 36,237 — 36,237 — Portfolio loans, net 20,828,787 — — 20,772,549 Accrued interest receivable on securities 32,979 — 32,979 — Accrued interest receivable on loans 70,344 — — 70,344 FHLB stock and FRB stock 153,968 — — — Swaps 105,772 — 105,772 — Financial liabilities: Non-maturity deposits 22,083,776 22,083,776 — — Certificates of deposit 1,757,942 — 1,758,273 — Other borrowings 31,679 — 31,679 — Subordinated Notes - Bank 143,757 — 145,000 — Subordinated Notes - Company 492,063 — 496,330 — Mortgage escrow funds 82,245 — 82,245 — Accrued interest payable on deposits 597 — 597 — Accrued interest payable on borrowings 10,234 — 10,234 — Swaps 45,233 — 45,233 — The following is a summary of the carrying amounts and estimated fair value of financial assets and liabilities (none of which were held for trading purposes) as of December 31, 2020: December 31, 2020 Carrying Level 1 inputs Level 2 inputs Level 3 inputs Financial assets: Cash and cash equivalents $ 305,002 $ 305,002 $ — $ — Securities AFS 2,298,618 — 2,298,618 — Securities HTM 1,740,838 — 1,874,504 — Loans held for sale 11,749 — 11,749 — Portfolio loans, net 21,522,309 — — 21,791,489 Accrued interest receivable on securities 26,508 — 26,508 — Accrued interest receivable on loans 70,997 — — 70,997 FHLB stock and FRB stock 166,190 — — — Swaps 149,797 — 149,797 — Financial liabilities: Non-maturity deposits 21,122,692 21,122,692 — — Certificates of deposit 1,996,830 — 2,002,702 — FHLB borrowings 382,000 — 382,000 — Other borrowings 304,101 — 304,101 — Subordinated Notes - Bank 143,703 — 145,870 — Subordinated Notes - Company 491,910 — 506,497 — Mortgage escrow funds 59,686 — 59,686 — Accrued interest payable on deposits 1,068 — 1,068 — Accrued interest payable on borrowings 3,425 — 3,425 — Swaps 60,004 — 60,004 —

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income - (Tables)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Schedule of accumulated other comprehensive income	Components of accumulated other comprehensive income were as follows as of the dates shown below: March 31, December 31, 2021 2020 Net unrealized holding gain on available for sale securities $ 80,878 $ 115,523 Related income tax expense (22,355) (31,931) Available for sale securities, net of tax 58,523 83,592 Net unrealized holding loss on securities transferred to held to maturity (303) (348) Related income tax benefit 84 96 Securities transferred to held to maturity, net of tax (219) (252) Net unrealized holding (loss) gain on retirement plans (985) 2,040 Related income tax benefit (expense) 272 (564) Retirement plans, net of tax (713) 1,476 Accumulated other comprehensive income $ 57,591 $ 84,816 The following table presents the changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the three months ended March 31, 2021 and 2020: Net unrealized holding gain on available for sale securities Net unrealized holding (loss) on securities transferred to held to maturity Net unrealized holding (loss) gain on retirement plans Total For the three months ended March 31, 2021 Balance beginning of the period $ 83,592 $ (252) $ 1,476 $ 84,816 Other comprehensive (loss) before reclassification (24,549) — — (24,549) Amounts reclassified from AOCI (520) 33 (2,189) (2,676) Total other comprehensive (loss) income (25,069) 33 (2,189) (27,225) Balance at end of period $ 58,523 $ (219) $ (713) $ 57,591 For the three months ended March 31, 2020 Balance beginning of the period $ 38,056 $ (538) $ 2,698 $ 40,216 Other comprehensive income before reclassification 35,280 — — 35,280 Amounts reclassified from AOCI (6,087) 70 (1,858) (7,875) Total other comprehensive income (loss) 29,193 70 (1,858) 27,405 Balance at end of period $ 67,249 $ (468) $ 840 $ 67,621 Location in consolidated income statements where reclassification from accumulated other comprehensive loss is included Net gain (loss) on sale of securities Interest income on securities Other non-interest expense

Basis of Financial Statement _3

Basis of Financial Statement Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss	$ 326,100	$ 323,186	$ 326,444	$ 106,238
Allowance for credit losses increase	251,700
Portfolio loans	21,848,409	21,151,973
Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans		494,500
Substandard and Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans		590,100
Impact of COVID-19
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss	$ 106,200	$ 323,200
Financing receivable allowance for credit loss as a percent of financing receivable	0.50%	1.53%
Allowance for credit losses increase	$ 165,000
Impact of COVID-19 | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans		$ 13,399
Payment Deferral | Impact of COVID-19
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	$ 208,400	$ 130,525

Securities - Amortized Cost to

Securities - Amortized Cost to Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Available for Sale
Amortized cost	$ 2,443,793	$ 2,183,095
Gross unrealized gains	91,650	117,761
Gross unrealized losses	(10,772)	(2,238)
Securities available for sale, at estimated fair value	2,524,671	2,298,618
Held to Maturity
Amortized cost	1,718,285	1,742,337
Gross unrecognized gains	108,176	132,243
Gross unrecognized losses	(229)	(76)
Held-to-maturity, fair value	1,826,232	1,874,504
Debt securities, held-to-maturity, allowance for credit loss	1,499	1,499
Agency-backed
Available for Sale
Amortized cost	832,665	873,358
Gross unrealized gains	33,917	44,911
Gross unrealized losses	(1,789)	(9)
Securities available for sale, at estimated fair value	864,793	918,260
Held to Maturity
Amortized cost	87,645	104,329
Gross unrecognized gains	3,013	4,100
Gross unrecognized losses	0	0
Held-to-maturity, fair value	90,658	108,429
Debt securities, held-to-maturity, allowance for credit loss	0	0
CMOs/Other MBS
Available for Sale
Amortized cost	302,349	352,473
Gross unrealized gains	12,403	20,811
Gross unrealized losses	0	0
Securities available for sale, at estimated fair value	314,752	373,284
Held to Maturity
Amortized cost	0	0
Gross unrecognized gains	0	0
Gross unrecognized losses	0	0
Held-to-maturity, fair value	0	0
Debt securities, held-to-maturity, allowance for credit loss	0	0
Total residential MBS
Available for Sale
Amortized cost	1,135,014	1,225,831
Gross unrealized gains	46,320	65,722
Gross unrealized losses	(1,789)	(9)
Securities available for sale, at estimated fair value	1,179,545	1,291,544
Held to Maturity
Amortized cost	87,645	104,329
Gross unrecognized gains	3,013	4,100
Gross unrecognized losses	0	0
Held-to-maturity, fair value	90,658	108,429
Debt securities, held-to-maturity, allowance for credit loss	0	0
US Treasury and federal agencies
Available for Sale
Amortized cost	340,074
Gross unrealized gains	4,898
Gross unrealized losses	(1,500)
Securities available for sale, at estimated fair value	343,472
Held to Maturity
Amortized cost	24,844
Gross unrecognized gains	687
Gross unrecognized losses	0
Held-to-maturity, fair value	25,531
Debt securities, held-to-maturity, allowance for credit loss	0
Federal agencies
Available for Sale
Amortized cost		149,852
Gross unrealized gains		6,615
Gross unrealized losses		0
Securities available for sale, at estimated fair value		156,467
Held to Maturity
Amortized cost		24,811
Gross unrecognized gains		844
Gross unrecognized losses		0
Held-to-maturity, fair value		25,655
Debt securities, held-to-maturity, allowance for credit loss		0
Corporate
Available for Sale
Amortized cost	594,845	438,226
Gross unrealized gains	25,200	27,334
Gross unrealized losses	(7,121)	(2,048)
Securities available for sale, at estimated fair value	612,924	463,512
Held to Maturity
Amortized cost	19,837	19,851
Gross unrecognized gains	868	535
Gross unrecognized losses	0	0
Held-to-maturity, fair value	20,705	20,386
Debt securities, held-to-maturity, allowance for credit loss	80	75
State and municipal
Available for Sale
Amortized cost	373,860	369,186
Gross unrealized gains	15,232	18,090
Gross unrealized losses	(362)	(181)
Securities available for sale, at estimated fair value	388,730	387,095
Held to Maturity
Amortized cost	1,568,209	1,575,596
Gross unrecognized gains	103,435	126,575
Gross unrecognized losses	(58)	(69)
Held-to-maturity, fair value	1,671,586	1,702,102
Debt securities, held-to-maturity, allowance for credit loss	1,374	1,379	$ 2,384	$ 0
Other
Available for Sale
Amortized cost	0	0
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Securities available for sale, at estimated fair value	0	0
Held to Maturity
Amortized cost	17,750	17,750
Gross unrecognized gains	173	189
Gross unrecognized losses	(171)	(7)
Held-to-maturity, fair value	17,752	17,932
Debt securities, held-to-maturity, allowance for credit loss	45	45
Total other securities
Available for Sale
Amortized cost	1,308,779	957,264
Gross unrealized gains	45,330	52,039
Gross unrealized losses	(8,983)	(2,229)
Securities available for sale, at estimated fair value	1,345,126	1,007,074
Held to Maturity
Amortized cost	1,630,640	1,638,008
Gross unrecognized gains	105,163	128,143
Gross unrecognized losses	(229)	(76)
Held-to-maturity, fair value	1,735,574	1,766,075
Debt securities, held-to-maturity, allowance for credit loss	$ 1,499	$ 1,499

Securities - Future Maturity (D

Securities - Future Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized cost
Available-for-sale, one year or less, amortized cost	$ 1,930
Available-for-sale, one to five years, amortized cost	321,730
Available-for-sale, five to ten years, amortized cost	603,636
Available-for-sale, greater than ten years, amortized cost	381,483
Available-for-sale, with a stated maturity date, amortized cost	1,308,779
Available-for-sale, without single maturity date, amortized cost	1,135,014
Amortized cost	2,443,793	$ 2,183,095
Fair value
Available-for-sale, one year or less, fair value	1,929
Available-for-sale, one to five years, fair value	332,513
Available-for-sale, five to ten years, fair value	624,601
Available-for-sale, greater than ten years, fair value	386,083
Available-for-sale, with a stated maturity date, fair value	1,345,126
Available-for-sale, without single maturity date, fair value	1,179,545
Securities available for sale	2,524,671	2,298,618
Amortized cost
Held-to-maturity, one year or less, amortized cost	23,767
Held-to-maturity, one to five years, amortized cost	84,722
Held-to-maturity, five to ten years, amortized cost	392,685
Held-to-maturity, greater than ten years, amortized cost	1,129,466
Held-to-maturity, with a stated maturity date, amortized cost	1,630,640
Held-to-maturity, without single maturity date, amortized cost	87,645
Amortized cost	1,718,285	1,742,337
Fair value
Held-to-maturity, one year or less, fair value	24,114
Held-to-maturity, one to five years, fair value	88,811
Held-to-maturity, five to ten years, fair value	417,633
Held-to-maturity, greater than ten years, fair value	1,205,016
Held-to-maturity, with a stated maturity date, fair value	1,735,574
Held-to-maturity, without single maturity date, fair value	90,658
Held-to-maturity, fair value	$ 1,826,232	$ 1,874,504

Securities - Sales and Calls of

Securities - Sales and Calls of Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Available for sale:
Proceeds from sales	$ 20,706	$ 407,524
Gross realized gains	1,236	8,480
Gross realized losses	(530)	(68)
Income tax expense on realized net gains	131	1,472
Proceeds from calls	2,950	139,777
Gross realized gains	31	4,909
Gross realized losses	(18)	(29)
Income tax expense on realized net gains	$ 2	$ 854

Securities - Available-for-sale

Securities - Available-for-sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months	$ 468,615	$ 86,094
Unrealized losses, less than 12 months, accumulated loss	(10,597)	(2,078)
Fair value, 12 months or longer	10,982	12,842
Unrealized losses, 12 months or longer	(175)	(160)
Fair value, total	479,597	98,936
Unrealized losses, total	(10,772)	(2,238)
Agency-backed
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months	48,576	396
Unrealized losses, less than 12 months, accumulated loss	(1,781)	(1)
Fair value, 12 months or longer	276	1,970
Unrealized losses, 12 months or longer	(8)	(8)
Fair value, total	48,852	2,366
Unrealized losses, total	(1,789)	(9)
US Treasury and federal agencies
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months	208,506
Unrealized losses, less than 12 months, accumulated loss	(1,500)
Fair value, 12 months or longer	0
Unrealized losses, 12 months or longer	0
Fair value, total	208,506
Unrealized losses, total	(1,500)
Corporate
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months	187,172	83,191
Unrealized losses, less than 12 months, accumulated loss	(7,121)	(2,048)
Fair value, 12 months or longer	0	0
Unrealized losses, 12 months or longer	0	0
Fair value, total	187,172	83,191
Unrealized losses, total	(7,121)	(2,048)
State and municipal
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months	24,361	2,507
Unrealized losses, less than 12 months, accumulated loss	(195)	(29)
Fair value, 12 months or longer	10,706	10,872
Unrealized losses, 12 months or longer	(167)	(152)
Fair value, total	35,067	13,379
Unrealized losses, total	(362)	(181)
Total other securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months	420,039	85,698
Unrealized losses, less than 12 months, accumulated loss	(8,816)	(2,077)
Fair value, 12 months or longer	10,706	10,872
Unrealized losses, 12 months or longer	(167)	(152)
Fair value, total	430,745	96,570
Unrealized losses, total	$ (8,983)	$ (2,229)

Securities - Narrative (Details

Securities - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)security	Mar. 31, 2020security	Dec. 31, 2020USD ($)
Investments, Debt and Equity Securities [Abstract]
Number of available for sale securities which were in continuous unrealized loss position for less than 12 months	59
Number of available for sale securities which were in continuous unrealized loss position for 12 months or more		56
Available-for-sale securities accrued interest receivable | $	$ 14.9		$ 10.9
Period used for discounted cash flow approach credit loss analysis	3 years
Held-to-maturity securities accrued interest receivable | $	$ 18.1		$ 15.6
Number of held to maturity securities which were in continuous unrealized loss position for less than 12 months	1
Number of held to maturity securities which were in continuous unrealized loss position for 12 months or more		26
Threshold period considered past due	30 days

Securities - Held to Maturity S

Securities - Held to Maturity Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Fair value, less than 12 months	$ 4,829	$ 10,098
Unrecognized losses, less than 12 months	(171)	(8)
Fair value, 12 months or longer	3,910	4,386
Unrecognized losses, 12 months or longer	(58)	(68)
Fair value, total	8,739	14,484
Unrecognized losses, total	(229)	(76)
State and municipal
Schedule of Held-to-maturity Securities [Line Items]
Fair value, less than 12 months	0	105
Unrecognized losses, less than 12 months	0	(1)
Fair value, 12 months or longer	3,910	4,386
Unrecognized losses, 12 months or longer	(58)	(68)
Fair value, total	3,910	4,491
Unrecognized losses, total	(58)	(69)
Agency-backed
Schedule of Held-to-maturity Securities [Line Items]
Fair value, less than 12 months		0
Unrecognized losses, less than 12 months		0
Fair value, 12 months or longer		0
Unrecognized losses, 12 months or longer		0
Fair value, total		0
Unrecognized losses, total		0
Other
Schedule of Held-to-maturity Securities [Line Items]
Fair value, less than 12 months	4,829	9,993
Unrecognized losses, less than 12 months	(171)	(7)
Fair value, 12 months or longer	0	0
Unrecognized losses, 12 months or longer	0	0
Fair value, total	4,829	9,993
Unrecognized losses, total	$ (171)	(7)
Total other securities
Schedule of Held-to-maturity Securities [Line Items]
Fair value, less than 12 months		10,098
Unrecognized losses, less than 12 months		(8)
Fair value, 12 months or longer		4,386
Unrecognized losses, 12 months or longer		(68)
Fair value, total		14,484
Unrecognized losses, total		$ (76)

Securities - Allowance for Cred

Securities - Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Balance at beginning of period	$ 1,499
Provision for credit loss expense	0	$ 1,703
Total ACL - HTM at end of period	1,499
Corporate and Other
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Balance at beginning of period	120	0
Provision for credit loss expense	5	7
Total ACL - HTM at end of period	125	115
State and municipal
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Balance at beginning of period	1,379	0
Provision for credit loss expense	(5)	1,696
Total ACL - HTM at end of period	1,374	2,384
Cumulative Effect, Period of Adoption, Adjustment | Corporate and Other
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Balance at beginning of period	0	108
Cumulative Effect, Period of Adoption, Adjustment | State and municipal
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Balance at beginning of period	$ 0	$ 688

Securities - Schedule of Held-T

Securities - Schedule of Held-To-Maturity Amortized Cost by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	$ 1,718,285	$ 1,742,337
Corporate and Other
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	37,587
Corporate and Other | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	0
Corporate and Other | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	17,750
Corporate and Other | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	0
Corporate and Other | BBB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	0
Corporate and Other | Non-rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	19,837
State and municipal
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	1,568,209	$ 1,575,596
State and municipal | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	991,273
State and municipal | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	550,395
State and municipal | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	20,522
State and municipal | BBB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	64
State and municipal | Non-rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized cost	$ 5,955

Securities - Securities Pledged

Securities - Securities Pledged for Borrowings (Details) - Total - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total securities pledged	$ 2,156,088	$ 1,818,789
Federal Home Loan Bank Borrowings
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale, pledged as collateral	31,679	27,101
Municipal Deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale, pledged as collateral	611,646	569,724
Held-to-maturity securities pledged as collateral	$ 1,512,763	$ 1,221,964

Portfolio Loans - Composition o

Portfolio Loans - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Components of loan portfolio, excluding loans held for sale
Portfolio loans	$ 21,151,973	$ 21,848,409
Allowance for credit losses	(323,186)	(326,100)	$ (326,444)	$ (106,238)
Portfolio loans, net	20,828,787	21,522,309
Traditional C&I
Components of loan portfolio, excluding loans held for sale
Portfolio loans	2,886,337
Allowance for credit losses	(46,393)	(42,670)	(35,289)	(15,951)
Asset-based lending
Components of loan portfolio, excluding loans held for sale
Portfolio loans	693,015
Allowance for credit losses	(11,165)	(12,762)	(26,490)	(14,272)
Payroll finance
Components of loan portfolio, excluding loans held for sale
Portfolio loans	153,987
Allowance for credit losses	(1,519)	(1,957)	(3,730)	(2,064)
Warehouse lending
Components of loan portfolio, excluding loans held for sale
Portfolio loans	1,394,945
Allowance for credit losses	(1,232)	(1,724)	(289)	(917)
Factored receivables
Components of loan portfolio, excluding loans held for sale
Portfolio loans	229,629
Allowance for credit losses	(3,237)	(2,904)	(9,194)	(654)
Equipment financing
Components of loan portfolio, excluding loans held for sale
Portfolio loans	1,475,716
Allowance for credit losses	(28,025)	(31,794)	(60,028)	(16,723)
Public sector finance
Components of loan portfolio, excluding loans held for sale
Portfolio loans	1,617,986
Allowance for credit losses	(4,632)	(4,516)	(1,929)	(1,967)
Acquisition, development and construction (“ADC”)
Components of loan portfolio, excluding loans held for sale
Portfolio loans	618,295
Allowance for credit losses	(13,803)	(17,927)	$ (15,204)	$ (4,732)
Commercial loans portfolio segment
Components of loan portfolio, excluding loans held for sale
Portfolio loans	19,491,041	20,041,861
Commercial loans portfolio segment | Commercial and industrial
Components of loan portfolio, excluding loans held for sale
Portfolio loans	8,451,614	9,160,268
Commercial loans portfolio segment | Commercial and industrial | Traditional C&I
Components of loan portfolio, excluding loans held for sale
Portfolio loans	2,886,336	2,920,205
Commercial loans portfolio segment | Commercial and industrial | Asset-based lending
Components of loan portfolio, excluding loans held for sale
Portfolio loans	693,015	803,004
Commercial loans portfolio segment | Commercial and industrial | Payroll finance
Components of loan portfolio, excluding loans held for sale
Portfolio loans	153,987	159,237
Commercial loans portfolio segment | Commercial and industrial | Warehouse lending
Components of loan portfolio, excluding loans held for sale
Portfolio loans	1,394,945	1,953,677
Commercial loans portfolio segment | Commercial and industrial | Factored receivables
Components of loan portfolio, excluding loans held for sale
Portfolio loans	229,629	220,217
Commercial loans portfolio segment | Commercial and industrial | Equipment financing
Components of loan portfolio, excluding loans held for sale
Portfolio loans	1,475,716	1,531,109
Commercial loans portfolio segment | Commercial and industrial | Public sector finance
Components of loan portfolio, excluding loans held for sale
Portfolio loans	1,617,986	1,572,819
Commercial loans portfolio segment | Real estate
Components of loan portfolio, excluding loans held for sale
Portfolio loans	11,039,427	10,881,593
Commercial loans portfolio segment | Real estate | Commercial real estate (“CRE”)
Components of loan portfolio, excluding loans held for sale
Portfolio loans	6,029,282	5,831,990
Commercial loans portfolio segment | Real estate | Multi-family | Multi-family
Components of loan portfolio, excluding loans held for sale
Portfolio loans	4,391,850	4,406,660
Commercial loans portfolio segment | Real estate | Acquisition, development and construction (“ADC”)
Components of loan portfolio, excluding loans held for sale
Portfolio loans	618,295	642,943
Residential mortgage portfolio segment
Components of loan portfolio, excluding loans held for sale
Portfolio loans	1,486,597	1,616,641
Consumer portfolio segment
Components of loan portfolio, excluding loans held for sale
Portfolio loans	$ 174,335	$ 189,907

Portfolio Loans - Narrative (De

Portfolio Loans - Narrative (Details)	3 Months Ended
	Mar. 31, 2021USD ($)loansecurity	Mar. 31, 2020USD ($)loan	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Deferred fees, deferred costs and purchase counting adjustments	$ 12,900,000		$ 20,900,000
Accrued interest receivable	103,323,000		97,505,000
Portfolio loans	21,151,973,000		21,848,409,000
Bank pledged mortgages	6,200,000,000		6,500,000,000
Non accrual loans	168,555,000		166,889,000
Loans 90 days or more past due still accruing interest	2,000		170,000
Loans classified as TDRs	76,446,000		78,971,000
Financing receivable, allowance for credit loss	323,186,000	$ 326,444,000	326,100,000	$ 106,238,000
TDRs modified and subsequently defaulted	490,000	16,600,000
Financing Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest receivable	70,300,000		71,000,000
Impact of COVID-19
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss	323,200,000		106,200,000
Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	$ 130,525,000		208,400,000
Number of contracts | security	237
Accrued interest	$ 8,500,000
Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	149,971,000		145,032,000
Nonperforming loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Non accrual loans	168,555,000		166,889,000
Loans 90 days or more past due still accruing interest	2,000		170,000
Nonperforming loans | Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Non accrual loans	123,100,000		115,900,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss	4,300,000		900,000
Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	1,486,597,000
Loans formally in process of foreclosure	2,900,000		3,200,000
Financing receivable, allowance for credit loss	15,970,000	23,090,000	16,529,000	7,598,000
Equipment financing
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	1,475,716,000
Financing receivable, allowance for credit loss	28,025,000	60,028,000	31,794,000	16,723,000
Traditional C&I
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	2,886,337,000
Financing receivable, allowance for credit loss	46,393,000	35,289,000	42,670,000	15,951,000
Warehouse lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	1,394,945,000
Financing receivable, allowance for credit loss	1,232,000	289,000	1,724,000	917,000
Factored receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	229,629,000
Financing receivable, allowance for credit loss	3,237,000	9,194,000	2,904,000	654,000
Public sector finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	1,617,986,000
Financing receivable, allowance for credit loss	4,632,000	$ 1,929,000	4,516,000	$ 1,967,000
Commercial loans portfolio segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	19,491,041,000		20,041,861,000
Commercial loans portfolio segment | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	48,290,000
Commercial loans portfolio segment | Commercial real estate (“CRE”) | Nonperforming loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivables sold	70,000,000
Commercial loans portfolio segment | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	8,451,614,000		9,160,268,000
Commercial loans portfolio segment | Commercial and industrial | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	3,143,000
Commercial loans portfolio segment | Commercial and industrial | Equipment financing
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	1,475,716,000		1,531,109,000
Non accrual loans	28,868,000		30,634,000
Loans 90 days or more past due still accruing interest	2,000		2,000
TDRs modified and subsequently defaulted, number | loan		2
Commercial loans portfolio segment | Commercial and industrial | Equipment financing | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	3,143,000
Commercial loans portfolio segment | Commercial and industrial | Equipment financing | Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	15,251,000		11,578,000
Commercial loans portfolio segment | Commercial and industrial | Traditional C&I
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	2,886,336,000		2,920,205,000
Non accrual loans	50,351,000		19,223,000
Loans 90 days or more past due still accruing interest	0		94,000
Commercial loans portfolio segment | Commercial and industrial | Traditional C&I | Small Business Administration Paycheck Protection Program
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	110,100,000
Commercial loans portfolio segment | Commercial and industrial | Traditional C&I | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	0
Commercial loans portfolio segment | Commercial and industrial | Traditional C&I | Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	37,997,000		17,339,000
Commercial loans portfolio segment | Commercial and industrial | Warehouse lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	1,394,945,000		1,953,677,000
Commercial loans portfolio segment | Commercial and industrial | Warehouse lending | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	0
Commercial loans portfolio segment | Commercial and industrial | Warehouse lending | Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	0		0
Non accrual loans	0		0
Loans 90 days or more past due still accruing interest	0		0
Commercial loans portfolio segment | Commercial and industrial | Factored receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	229,629,000		220,217,000
Commercial loans portfolio segment | Commercial and industrial | Factored receivables | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	0
Commercial loans portfolio segment | Commercial and industrial | Factored receivables | Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	0		0
Commercial loans portfolio segment | Commercial and industrial | Public sector finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	1,617,986,000		1,572,819,000
Commercial loans portfolio segment | Commercial and industrial | Public sector finance | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	0
Commercial loans portfolio segment | Commercial and industrial | Public sector finance | Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	0		0
Non accrual loans	0		0
Loans 90 days or more past due still accruing interest	0		0
Commercial loans portfolio segment | Real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	11,039,427,000		10,881,593,000
Commercial loans portfolio segment | Real estate | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	45,147,000
Commercial loans portfolio segment | Real estate | Commercial real estate (“CRE”)
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	6,029,282,000		5,831,990,000
Non accrual loans	24,269,000		46,053,000
Loans 90 days or more past due still accruing interest	$ 0		74,000
TDRs modified and subsequently defaulted, number | loan	2
Commercial loans portfolio segment | Real estate | Commercial real estate (“CRE”) | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	$ 40,583,000
Commercial loans portfolio segment | Real estate | Commercial real estate (“CRE”) | Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	36,114,000		53,212,000
Residential mortgage portfolio segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	1,486,597,000		1,616,641,000
Non accrual loans	17,081,000		18,661,000
Loans 90 days or more past due still accruing interest	0		0
Residential mortgage portfolio segment | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	78,059,000
Residential mortgage portfolio segment | Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	$ 6,214,000		5,025,000
Residential mortgage portfolio segment | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
TDRs modified and subsequently defaulted, number | loan	1
Consumer portfolio segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	$ 174,335,000		189,907,000
Non accrual loans	9,746,000		10,278,000
Loans 90 days or more past due still accruing interest	0		0
Consumer portfolio segment | Impact of COVID-19 | Payment Deferral
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	4,176,000
Consumer portfolio segment | Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans	$ 6,093,000		$ 7,384,000

Portfolio Loans - Aging Analysi

Portfolio Loans - Aging Analysis of Portfolio Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Current loans	$ 21,013,164	$ 21,654,234
Total	21,151,973	21,848,409
Trouble Debt restructuring current loans	74,064	60,257
Past due TDRs	76,446	78,971
Non-performing loans:
Loans 90 days past due and still accruing	2	170
Non accrual loans	168,555	166,889
Nonperforming loans
Non-performing loans:
Loans 90 days past due and still accruing	2	170
Non accrual loans	168,555	166,889
Total non-performing loans	168,557	167,059
30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	32,327	59,157
Past due TDRs	0	2,927
60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	16,705	39,696
Past due TDRs	490	13,492
90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	89,777	95,322
Past due TDRs	1,892	2,295
Traditional C&I
Financing Receivable, Past Due [Line Items]
Total	2,886,337
Asset-based lending
Financing Receivable, Past Due [Line Items]
Total	693,015
Payroll finance
Financing Receivable, Past Due [Line Items]
Total	153,987
Warehouse lending
Financing Receivable, Past Due [Line Items]
Total	1,394,945
Factored receivables
Financing Receivable, Past Due [Line Items]
Total	229,629
Equipment financing
Financing Receivable, Past Due [Line Items]
Total	1,475,716
Public sector finance
Financing Receivable, Past Due [Line Items]
Total	1,617,986
Acquisition, development and construction (“ADC”)
Financing Receivable, Past Due [Line Items]
Total	618,295
Commercial loans portfolio segment
Financing Receivable, Past Due [Line Items]
Total	19,491,041	20,041,861
Commercial loans portfolio segment | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	8,451,614	9,160,268
Commercial loans portfolio segment | Commercial and industrial | Traditional C&I
Financing Receivable, Past Due [Line Items]
Current loans	2,865,977	2,905,964
Total	2,886,336	2,920,205
Non-performing loans:
Loans 90 days past due and still accruing	0	94
Non accrual loans	50,351	19,223
Commercial loans portfolio segment | Commercial and industrial | Traditional C&I | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	2,659	1,215
Commercial loans portfolio segment | Commercial and industrial | Traditional C&I | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	997	6,054
Commercial loans portfolio segment | Commercial and industrial | Traditional C&I | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	16,703	6,972
Commercial loans portfolio segment | Commercial and industrial | Asset-based lending
Financing Receivable, Past Due [Line Items]
Current loans	693,015	803,004
Total	693,015	803,004
Non-performing loans:
Loans 90 days past due and still accruing	0	0
Non accrual loans	10,149	5,255
Commercial loans portfolio segment | Commercial and industrial | Asset-based lending | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Asset-based lending | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Asset-based lending | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Payroll finance
Financing Receivable, Past Due [Line Items]
Current loans	153,987	159,237
Total	153,987	159,237
Non-performing loans:
Loans 90 days past due and still accruing	0	0
Non accrual loans	2,313	2,300
Commercial loans portfolio segment | Commercial and industrial | Payroll finance | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Payroll finance | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Payroll finance | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Warehouse lending
Financing Receivable, Past Due [Line Items]
Current loans	1,394,945	1,953,677
Total	1,394,945	1,953,677
Commercial loans portfolio segment | Commercial and industrial | Warehouse lending | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Warehouse lending | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Warehouse lending | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Factored receivables
Financing Receivable, Past Due [Line Items]
Current loans	229,629	220,217
Total	229,629	220,217
Commercial loans portfolio segment | Commercial and industrial | Factored receivables | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Factored receivables | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Factored receivables | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Equipment financing
Financing Receivable, Past Due [Line Items]
Current loans	1,449,419	1,469,653
Total	1,475,716	1,531,109
Non-performing loans:
Loans 90 days past due and still accruing	2	2
Non accrual loans	28,868	30,634
Commercial loans portfolio segment | Commercial and industrial | Equipment financing | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	2,975	24,286
Commercial loans portfolio segment | Commercial and industrial | Equipment financing | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	2,526	11,077
Commercial loans portfolio segment | Commercial and industrial | Equipment financing | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	20,796	26,093
Commercial loans portfolio segment | Commercial and industrial | Public sector finance
Financing Receivable, Past Due [Line Items]
Current loans	1,617,986	1,572,819
Total	1,617,986	1,572,819
Commercial loans portfolio segment | Commercial and industrial | Public sector finance | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Public sector finance | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Commercial and industrial | Public sector finance | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Real estate
Financing Receivable, Past Due [Line Items]
Total	11,039,427	10,881,593
Commercial loans portfolio segment | Real estate | Commercial real estate (“CRE”)
Financing Receivable, Past Due [Line Items]
Current loans	6,012,339	5,794,115
Total	6,029,282	5,831,990
Non-performing loans:
Loans 90 days past due and still accruing	0	74
Non accrual loans	24,269	46,053
Commercial loans portfolio segment | Real estate | Commercial real estate (“CRE”) | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	4,057	13,591
Commercial loans portfolio segment | Real estate | Commercial real estate (“CRE”) | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	10,079	17,421
Commercial loans portfolio segment | Real estate | Commercial real estate (“CRE”) | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	2,807	6,863
Commercial loans portfolio segment | Real estate | Multi-family | Multi-family
Financing Receivable, Past Due [Line Items]
Current loans	4,377,043	4,393,950
Total	4,391,850	4,406,660
Non-performing loans:
Loans 90 days past due and still accruing	0	0
Non accrual loans	778	4,485
Commercial loans portfolio segment | Real estate | Multi-family | Multi-family | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	14,026	11,578
Commercial loans portfolio segment | Real estate | Multi-family | Multi-family | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	3	811
Commercial loans portfolio segment | Real estate | Multi-family | Multi-family | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	778	321
Commercial loans portfolio segment | Real estate | Acquisition, development and construction (“ADC”)
Financing Receivable, Past Due [Line Items]
Current loans	593,295	612,943
Total	618,295	642,943
Non-performing loans:
Loans 90 days past due and still accruing	0	0
Non accrual loans	25,000	30,000
Commercial loans portfolio segment | Real estate | Acquisition, development and construction (“ADC”) | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Real estate | Acquisition, development and construction (“ADC”) | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	0	0
Commercial loans portfolio segment | Real estate | Acquisition, development and construction (“ADC”) | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	25,000	30,000
Residential mortgage portfolio segment
Financing Receivable, Past Due [Line Items]
Current loans	1,462,169	1,590,068
Total	1,486,597	1,616,641
Non-performing loans:
Loans 90 days past due and still accruing	0	0
Non accrual loans	17,081	18,661
Residential mortgage portfolio segment | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	7,381	7,444
Residential mortgage portfolio segment | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	2,702	3,426
Residential mortgage portfolio segment | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	14,345	15,703
Consumer portfolio segment
Financing Receivable, Past Due [Line Items]
Current loans	163,360	178,587
Total	174,335	189,907
Non-performing loans:
Loans 90 days past due and still accruing	0	0
Non accrual loans	9,746	10,278
Consumer portfolio segment | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	1,229	1,043
Consumer portfolio segment | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	398	907
Consumer portfolio segment | 90 days past due
Financing Receivable, Past Due [Line Items]
Past due loans	$ 9,348	$ 9,370

Portfolio Loans - Schedule of C

Portfolio Loans - Schedule of Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	$ 21,151,973	$ 21,848,409
Total
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	149,971	145,032
Real estate
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	81,558	105,960
Business assets
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	42,243	11,697
Equipment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	18,794	16,459
Taxi medallions
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	7,376	10,916
Traditional C&I
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	2,886,337
Asset-based lending
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	693,015
Payroll finance
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	153,987
Equipment financing
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	1,475,716
Acquisition, development and construction (“ADC”)
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	618,295
Commercial loans portfolio segment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	19,491,041	20,041,861
Residential mortgage portfolio segment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	1,486,597	1,616,641
Residential mortgage portfolio segment | Total
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	6,214	5,025
Residential mortgage portfolio segment | Real estate
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	6,214	5,025
Residential mortgage portfolio segment | Business assets
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Residential mortgage portfolio segment | Equipment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Residential mortgage portfolio segment | Taxi medallions
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Consumer portfolio segment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	174,335	189,907
Consumer portfolio segment | Total
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	6,093	7,384
Consumer portfolio segment | Real estate
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	6,093	7,384
Consumer portfolio segment | Business assets
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Consumer portfolio segment | Equipment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Consumer portfolio segment | Taxi medallions
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Commercial and industrial | Commercial loans portfolio segment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	8,451,614	9,160,268
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	2,886,336	2,920,205
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I | Total
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	37,997	17,339
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I | Real estate
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	412	425
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I | Business assets
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	24,781	0
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I | Equipment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	5,428	5,998
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I | Taxi medallions
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	7,376	10,916
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	693,015	803,004
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending | Total
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	13,264	8,280
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending | Real estate
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending | Business assets
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	13,264	8,280
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending | Equipment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending | Taxi medallions
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Commercial and industrial | Commercial loans portfolio segment | Payroll finance
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	153,987	159,237
Commercial and industrial | Commercial loans portfolio segment | Payroll finance | Total
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	2,313	2,300
Commercial and industrial | Commercial loans portfolio segment | Payroll finance | Real estate
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Commercial and industrial | Commercial loans portfolio segment | Payroll finance | Business assets
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	2,313	2,300
Commercial and industrial | Commercial loans portfolio segment | Payroll finance | Equipment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Commercial and industrial | Commercial loans portfolio segment | Payroll finance | Taxi medallions
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Commercial and industrial | Commercial loans portfolio segment | Equipment financing
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	1,475,716	1,531,109
Commercial and industrial | Commercial loans portfolio segment | Equipment financing | Total
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	15,251	11,578
Commercial and industrial | Commercial loans portfolio segment | Equipment financing | Real estate
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Commercial and industrial | Commercial loans portfolio segment | Equipment financing | Business assets
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	1,885	1,117
Commercial and industrial | Commercial loans portfolio segment | Equipment financing | Equipment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	13,366	10,461
Commercial and industrial | Commercial loans portfolio segment | Equipment financing | Taxi medallions
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Real estate | Commercial loans portfolio segment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	11,039,427	10,881,593
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”)
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	6,029,282	5,831,990
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”) | Total
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	36,114	53,212
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”) | Real estate
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	36,114	53,212
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”) | Business assets
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”) | Equipment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”) | Taxi medallions
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	4,391,850	4,406,660
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family | Total
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	7,725	9,914
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family | Real estate
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	7,725	9,914
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family | Business assets
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family | Equipment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family | Taxi medallions
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”)
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	618,295	642,943
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”) | Total
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	25,000	30,000
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”) | Real estate
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	25,000	30,000
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”) | Business assets
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”) | Equipment
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	0	0
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”) | Taxi medallions
Financing Receivable, Collateral-Dependent Loans [Line Items]
Portfolio loans	$ 0	$ 0

Portfolio Loans - Nonaccrual Lo

Portfolio Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans with no ACL	$ 41,055	$ 77,773
Loans 90 days or more past due still accruing interest	2	170
Total Non-accrual Loans	168,555	166,889
Commercial loans portfolio segment | Traditional C&I | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans with no ACL	12,804	16,914
Loans 90 days or more past due still accruing interest	0	94
Total Non-accrual Loans	50,351	19,223
Commercial loans portfolio segment | Asset-based lending | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans with no ACL	5,789	4,613
Loans 90 days or more past due still accruing interest	0	0
Total Non-accrual Loans	10,149	5,255
Commercial loans portfolio segment | Payroll finance | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans with no ACL	2,313	2,300
Loans 90 days or more past due still accruing interest	0	0
Total Non-accrual Loans	2,313	2,300
Commercial loans portfolio segment | Equipment financing | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans with no ACL	15,252	11,578
Loans 90 days or more past due still accruing interest	2	2
Total Non-accrual Loans	28,868	30,634
Commercial loans portfolio segment | Commercial real estate (“CRE”) | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans with no ACL	858	38,529
Loans 90 days or more past due still accruing interest	0	74
Total Non-accrual Loans	24,269	46,053
Commercial loans portfolio segment | Multi-family | Multi-family | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans with no ACL	0	2,156
Loans 90 days or more past due still accruing interest	0	0
Total Non-accrual Loans	778	4,485
Commercial loans portfolio segment | Acquisition, development and construction (“ADC”) | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans with no ACL	0	0
Loans 90 days or more past due still accruing interest	0	0
Total Non-accrual Loans	25,000	30,000
Residential mortgage portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans with no ACL	3,264	808
Loans 90 days or more past due still accruing interest	0	0
Total Non-accrual Loans	17,081	18,661
Consumer portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans with no ACL	775	875
Loans 90 days or more past due still accruing interest	0	0
Total Non-accrual Loans	$ 9,746	$ 10,278

Portfolio Loans - Schedule of A

Portfolio Loans - Schedule of Accrued Interest Receivable Reversed Against Interest Income (Details) - Interest Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable, reversed against interest income	$ 273	$ 631
Residential mortgage portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable, reversed against interest income	173	80
Consumer portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable, reversed against interest income	19	7
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable, reversed against interest income	36	7
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable, reversed against interest income	0	67
Commercial and industrial | Commercial loans portfolio segment | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable, reversed against interest income	38	0
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable, reversed against interest income	7	146
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable, reversed against interest income	0	27
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable, reversed against interest income	$ 0	$ 297

Portfolio Loans - Loan Deferral

Portfolio Loans - Loan Deferrals (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 21,151,973	$ 21,848,409
Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 494,500
Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.60%
Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 13,399
Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	130,525	208,400
Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	29,236
Traditional C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	2,886,337
Traditional C&I | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	37,627
Traditional C&I | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	95,527
Asset-based lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	693,015
Asset-based lending | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	92,534
Asset-based lending | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	13,817
Payroll finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	153,987
Payroll finance | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,176
Payroll finance | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	2,313
Warehouse lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,394,945
Warehouse lending | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Warehouse lending | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Factored receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	229,629
Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,475,716
Equipment financing | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	6,323
Equipment financing | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	47,527
Public sector finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,617,986
Acquisition, development and construction (“ADC”)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	618,295
Acquisition, development and construction (“ADC”) | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,613
Acquisition, development and construction (“ADC”) | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	25,000
Commercial loans portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 19,491,041	20,041,861
Commercial loans portfolio segment | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.20%
Commercial loans portfolio segment | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 13,399
Commercial loans portfolio segment | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	48,290
Commercial loans portfolio segment | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	28,881
Residential mortgage portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 1,486,597	1,616,641
Residential mortgage portfolio segment | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	5.30%
Residential mortgage portfolio segment | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Residential mortgage portfolio segment | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	78,059
Residential mortgage portfolio segment | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	355
Consumer portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 174,335	189,907
Consumer portfolio segment | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	2.40%
Consumer portfolio segment | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Consumer portfolio segment | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	4,176
Consumer portfolio segment | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 8,451,614	9,160,268
Commercial and industrial | Commercial loans portfolio segment | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.00%
Commercial and industrial | Commercial loans portfolio segment | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Commercial and industrial | Commercial loans portfolio segment | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	3,143
Commercial and industrial | Commercial loans portfolio segment | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	2,297
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 2,886,336	2,920,205
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.00%
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Traditional C&I | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 693,015	803,004
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.00%
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Asset-based lending | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Payroll finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 153,987	159,237
Commercial and industrial | Commercial loans portfolio segment | Payroll finance | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.00%
Commercial and industrial | Commercial loans portfolio segment | Payroll finance | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Commercial and industrial | Commercial loans portfolio segment | Payroll finance | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Payroll finance | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Warehouse lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 1,394,945	1,953,677
Commercial and industrial | Commercial loans portfolio segment | Warehouse lending | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.00%
Commercial and industrial | Commercial loans portfolio segment | Warehouse lending | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Commercial and industrial | Commercial loans portfolio segment | Warehouse lending | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Warehouse lending | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Factored receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 229,629	220,217
Commercial and industrial | Commercial loans portfolio segment | Factored receivables | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.00%
Commercial and industrial | Commercial loans portfolio segment | Factored receivables | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Commercial and industrial | Commercial loans portfolio segment | Factored receivables | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Factored receivables | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 1,475,716	1,531,109
Commercial and industrial | Commercial loans portfolio segment | Equipment financing | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.20%
Commercial and industrial | Commercial loans portfolio segment | Equipment financing | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Commercial and industrial | Commercial loans portfolio segment | Equipment financing | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	3,143
Commercial and industrial | Commercial loans portfolio segment | Equipment financing | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	2,297
Commercial and industrial | Commercial loans portfolio segment | Public sector finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 1,617,986	1,572,819
Commercial and industrial | Commercial loans portfolio segment | Public sector finance | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.00%
Commercial and industrial | Commercial loans portfolio segment | Public sector finance | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Commercial and industrial | Commercial loans portfolio segment | Public sector finance | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Commercial and industrial | Commercial loans portfolio segment | Public sector finance | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Real estate | Commercial loans portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 11,039,427	10,881,593
Real estate | Commercial loans portfolio segment | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.40%
Real estate | Commercial loans portfolio segment | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 13,399
Real estate | Commercial loans portfolio segment | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	45,147
Real estate | Commercial loans portfolio segment | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	26,584
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 6,029,282	5,831,990
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”) | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.70%
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”) | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 13,399
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”) | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	40,583
Real estate | Commercial loans portfolio segment | Commercial real estate (“CRE”) | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	26,584
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 4,391,850	4,406,660
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.10%
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	4,564
Real estate | Commercial loans portfolio segment | Multi-family | Multi-family | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 618,295	$ 642,943
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”) | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loan balance with deferred payment	0.00%
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”) | Impact of COVID-19 | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”) | Payment Deferral | Impact of COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	0
Real estate | Commercial loans portfolio segment | Acquisition, development and construction (“ADC”) | Payment Deferral | Impact of COVID-19 | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	$ 0

Portfolio Loans - Loans Modifie

Portfolio Loans - Loans Modified as TDRs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	0	1
Recorded investment, Pre-modification	$ 0	$ 4,943
Recorded investment, Post-modification	$ 0	$ 4,943
Commercial loans portfolio segment | Commercial and industrial | Asset-based lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan		1
Recorded investment, Pre-modification	$ 0	$ 4,943
Recorded investment, Post-modification	$ 0	$ 4,943

Allowance for Credit Losses -_3

Allowance for Credit Losses - Loans - Allowance Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2019
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	$ 326,100	$ 106,238
Charge-offs	(15,260)	(9,838)
Recoveries	2,346	2,883
Net charge-offs	(12,914)	(6,955)
Provision / (credit)	10,000	136,577
Ending balance	$ 323,186	$ 326,444	$ 106,238
Annualized net charge-offs to average loans outstanding:	0.25%	0.13%
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201613Member
Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		$ 90,584
Ending balance			$ 90,584
Traditional C&I
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	$ 42,670	15,951
Charge-offs	(1,027)	(298)
Recoveries	468	475
Net charge-offs	(559)	177
Provision / (credit)	4,282	13,836
Ending balance	46,393	35,289	15,951
Traditional C&I | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		5,325
Ending balance			5,325
Asset-based lending
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	12,762	14,272
Charge-offs	0	(985)
Recoveries	0	0
Net charge-offs	0	(985)
Provision / (credit)	(1,597)	1,230
Ending balance	11,165	26,490	14,272
Asset-based lending | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		11,973
Ending balance			11,973
Payroll finance
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	1,957	2,064
Charge-offs	0	0
Recoveries	2	9
Net charge-offs	2	9
Provision / (credit)	(440)	323
Ending balance	1,519	3,730	2,064
Payroll finance | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		1,334
Ending balance			1,334
Warehouse lending
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	1,724	917
Charge-offs	0	0
Recoveries	0	0
Net charge-offs	0	0
Provision / (credit)	(492)	(266)
Ending balance	1,232	289	917
Warehouse lending | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		(362)
Ending balance			(362)
Factored receivables
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	2,904	654
Charge-offs	(4)	(7)
Recoveries	406	4
Net charge-offs	402	(3)
Provision / (credit)	(69)	7,748
Ending balance	3,237	9,194	654
Factored receivables | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		795
Ending balance			795
Equipment financing
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	31,794	16,723
Charge-offs	(2,408)	(4,793)
Recoveries	854	1,105
Net charge-offs	(1,554)	(3,688)
Provision / (credit)	(2,215)	13,993
Ending balance	28,025	60,028	16,723
Equipment financing | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		33,000
Ending balance			33,000
Public sector finance
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	4,516	1,967
Charge-offs	0	0
Recoveries	0	0
Net charge-offs	0	0
Provision / (credit)	116	728
Ending balance	4,632	1,929	1,967
Public sector finance | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		(766)
Ending balance			(766)
CRE
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	155,313	27,965
Charge-offs	(2,933)	(1,275)
Recoveries	487	60
Net charge-offs	(2,446)	(1,215)
Provision / (credit)	6,555	62,799
Ending balance	159,422	97,586	27,965
CRE | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		8,037
Ending balance			8,037
Multi-family
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	33,320	11,440
Charge-offs	(3,230)	0
Recoveries	0	0
Net charge-offs	(3,230)	0
Provision / (credit)	3,286	22,751
Ending balance	33,376	49,097	11,440
Multi-family | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		14,906
Ending balance			14,906
Acquisition, development and construction (“ADC”)
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	17,927	4,732
Charge-offs	(5,000)	(3)
Recoveries	0	105
Net charge-offs	(5,000)	102
Provision / (credit)	876	10,489
Ending balance	13,803	15,204	4,732
Acquisition, development and construction (“ADC”) | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		(119)
Ending balance			(119)
Residential mortgage
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	16,529	7,598
Charge-offs	(267)	(1,072)
Recoveries	37	0
Net charge-offs	(230)	(1,072)
Provision / (credit)	(329)	2,460
Ending balance	15,970	23,090	7,598
Residential mortgage | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		14,104
Ending balance			14,104
Consumer
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance	4,684	1,955
Charge-offs	(391)	(1,405)
Recoveries	92	1,125
Net charge-offs	(299)	(280)
Provision / (credit)	27	486
Ending balance	$ 4,412	4,518	1,955
Consumer | Cumulative Effect, Period of Adoption, Adjustment
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning balance		$ 2,357
Ending balance			$ 2,357

Allowance for Credit Losses -_4

Allowance for Credit Losses - Loans - Narrative (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance threshold for individual credit assessment	$ 750,000
Portfolio loans, net	20,828,787,000	$ 21,522,309,000
Doubtful | Traditional C&I
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	$ 295,000	304,000
Loss
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net		$ 0

Allowance for Credit Losses -_5

Allowance for Credit Losses - Loans - Valuation Allowances Recorded Against Portfolio Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	$ 20,828,787	$ 21,522,309
Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	494,452	461,458
Special mention | Traditional C&I
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	37,627	24,162
Special mention | Asset-based lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	92,534	111,597
Special mention | Payroll finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	1,176	0
Special mention | Factored receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	0	5,523
Special mention | Equipment financing
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	6,323	7,737
Special mention | CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	240,770	249,403
Special mention | Multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	114,402	61,146
Special mention | Acquisition, development and construction (“ADC”)
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	1,613	1,407
Special mention | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	0	468
Special mention | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	7	15
Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	590,109	528,760
Substandard | Traditional C&I
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	95,527	84,792
Substandard | Asset-based lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	13,817	11,669
Substandard | Payroll finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	2,313	2,300
Substandard | Factored receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	0	0
Substandard | Equipment financing
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	47,527	45,018
Substandard | CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	347,393	280,796
Substandard | Multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	31,328	44,872
Substandard | Acquisition, development and construction (“ADC”)
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	25,000	30,000
Substandard | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	17,368	18,942
Substandard | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Portfolio loans, net	$ 9,836	$ 10,371

Allowance for Credit Losses -_6

Allowance for Credit Losses - Loans - Schedule of Term Loans Amortized Cost Basis by Origination Year (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	$ 672,392
2020	2,991,437
2019	3,709,223
2018	2,363,540
2017	2,079,784
Prior	6,611,063
Revolving loans	2,658,504
Revolving loans converted to term	66,030
Total	21,151,973	$ 21,848,409
Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	494,500
Traditional C&I
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	56,325
2020	396,227
2019	248,932
2018	282,872
2017	130,867
Prior	173,881
Revolving loans	1,597,233
Revolving loans converted to term	0
Total	2,886,337
Traditional C&I | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	55,876
2020	394,938
2019	202,836
2018	247,049
2017	120,169
Prior	162,274
Revolving loans	1,569,746
Revolving loans converted to term	0
Total	2,752,888
Traditional C&I | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	438
2020	165
2019	8,846
2018	17,261
2017	4,030
Prior	1,555
Revolving loans	5,332
Revolving loans converted to term	0
Total	37,627
Traditional C&I | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	11
2020	1,124
2019	37,250
2018	18,562
2017	6,668
Prior	10,052
Revolving loans	21,860
Revolving loans converted to term	0
Total	95,527
Traditional C&I | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving loans	295
Revolving loans converted to term	0
Total	295
Asset-based lending
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	12,108
2020	45,326
2019	28,077
2018	14,928
2017	23,965
Prior	59,521
Revolving loans	509,090
Revolving loans converted to term	0
Total	693,015
Asset-based lending | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	12,108
2020	45,326
2019	27,339
2018	5,451
2017	10,212
Prior	58,968
Revolving loans	427,260
Revolving loans converted to term	0
Total	586,664
Asset-based lending | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	738
2018	9,477
2017	13,753
Prior	0
Revolving loans	68,566
Revolving loans converted to term	0
Total	92,534
Asset-based lending | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	553
Revolving loans	13,264
Revolving loans converted to term	0
Total	13,817
Payroll finance
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	8,014
2018	0
2017	0
Prior	0
Revolving loans	145,973
Revolving loans converted to term	0
Total	153,987
Payroll finance | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	8,014
2018	0
2017	0
Prior	0
Revolving loans	142,484
Revolving loans converted to term	0
Total	150,498
Payroll finance | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving loans	1,176
Revolving loans converted to term	0
Total	1,176
Payroll finance | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving loans	2,313
Revolving loans converted to term	0
Total	2,313
Warehouse lending
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	41,469
2020	112,045
2019	41,103
2018	53,592
2017	236,757
Prior	909,979
Revolving loans	0
Revolving loans converted to term	0
Total	1,394,945
Warehouse lending | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	41,469
2020	112,045
2019	41,103
2018	53,592
2017	236,757
Prior	909,979
Revolving loans	0
Revolving loans converted to term	0
Total	1,394,945
Warehouse lending | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving loans	0
Revolving loans converted to term	0
Total	0
Warehouse lending | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving loans	0
Revolving loans converted to term	0
Total	0
Factored receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving loans	229,629
Revolving loans converted to term	0
Total	229,629
Factored receivables | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving loans	229,629
Revolving loans converted to term	0
Total	229,629
Equipment financing
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	82,999
2020	408,653
2019	524,737
2018	235,272
2017	106,276
Prior	117,779
Revolving loans	0
Revolving loans converted to term	0
Total	1,475,716
Equipment financing | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	82,999
2020	408,641
2019	498,484
2018	224,618
2017	93,669
Prior	113,455
Revolving loans	0
Revolving loans converted to term	0
Total	1,421,866
Equipment financing | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	3,999
2018	2,023
2017	185
Prior	116
Revolving loans	0
Revolving loans converted to term	0
Total	6,323
Equipment financing | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	12
2019	22,254
2018	8,631
2017	12,422
Prior	4,208
Revolving loans	0
Revolving loans converted to term	0
Total	47,527
Public sector finance
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	73,774
2020	437,123
2019	398,280
2018	206,591
2017	261,963
Prior	240,255
Revolving loans	0
Revolving loans converted to term	0
Total	1,617,986
Public sector finance | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	73,774
2020	437,123
2019	398,280
2018	206,591
2017	261,963
Prior	240,255
Revolving loans	0
Revolving loans converted to term	0
Total	1,617,986
CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	168,163
2020	1,093,416
2019	1,423,903
2018	997,585
2017	598,248
Prior	1,747,966
Revolving loans	0
Revolving loans converted to term	0
Total	6,029,281
CRE | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	168,163
2020	1,047,246
2019	1,247,285
2018	882,651
2017	514,007
Prior	1,581,766
Revolving loans	0
Revolving loans converted to term	0
Total	5,441,118
CRE | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	8,349
2019	111,559
2018	19,246
2017	54,793
Prior	46,823
Revolving loans	0
Revolving loans converted to term	0
Total	240,770
CRE | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	37,821
2019	65,059
2018	95,688
2017	29,448
Prior	119,377
Revolving loans	0
Revolving loans converted to term	0
Total	347,393
Multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	211,873
2020	371,457
2019	749,827
2018	439,898
2017	626,714
Prior	1,917,374
Revolving loans	74,707
Revolving loans converted to term	0
Total	4,391,850
Multi-family | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	211,873
2020	371,457
2019	707,272
2018	431,720
2017	600,632
Prior	1,855,436
Revolving loans	67,730
Revolving loans converted to term	0
Total	4,246,120
Multi-family | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	32,370
2018	8,178
2017	26,082
Prior	43,742
Revolving loans	4,030
Revolving loans converted to term	0
Total	114,402
Multi-family | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	10,185
2018	0
2017	0
Prior	18,196
Revolving loans	2,947
Revolving loans converted to term	0
Total	31,328
Acquisition, development and construction (“ADC”)
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	25,451
2020	116,526
2019	274,904
2018	100,437
2017	53,971
Prior	47,006
Revolving loans	0
Revolving loans converted to term	0
Total	618,295
Acquisition, development and construction (“ADC”) | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	25,451
2020	114,913
2019	274,904
2018	100,437
2017	28,971
Prior	47,006
Revolving loans	0
Revolving loans converted to term	0
Total	591,682
Acquisition, development and construction (“ADC”) | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	1,613
2019	0
2018	0
2017	0
Prior	0
Revolving loans	0
Revolving loans converted to term	0
Total	1,613
Acquisition, development and construction (“ADC”) | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	25,000
Prior	0
Revolving loans	0
Revolving loans converted to term	0
Total	25,000
Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	230
2020	10,594
2019	11,088
2018	31,989
2017	40,801
Prior	1,391,895
Revolving loans	0
Revolving loans converted to term	0
Total	1,486,597
Residential mortgage | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	230
2020	10,594
2019	11,088
2018	31,989
2017	40,801
Prior	1,374,527
Revolving loans	0
Revolving loans converted to term	0
Total	1,469,229
Residential mortgage | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	17,368
Revolving loans	0
Revolving loans converted to term	0
Total	17,368
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	70
2019	358
2018	376
2017	222
Prior	5,407
Revolving loans	101,872
Revolving loans converted to term	66,030
Total	174,335
Consumer | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	70
2019	358
2018	376
2017	222
Prior	5,013
Revolving loans	98,640
Revolving loans converted to term	59,813
Total	164,492
Consumer | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving loans	7
Revolving loans converted to term	0
Total	7
Consumer | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	394
Revolving loans	3,225
Revolving loans converted to term	6,217
Total	$ 9,836

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Balance of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 1,683,482	$ 1,683,482
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	89,788	93,564
Core deposits
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	66,180	69,808
Customer lists
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	3,108	3,256
Trade name
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	$ 20,500	$ 20,500

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Future Amortization Expense (Details) $ in Thousands	Mar. 31, 2021USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2021	$ 11,328
2022	13,703
2023	12,322
2024	10,448
2025	8,722
2026	7,134
Thereafter	5,631
Total	$ 69,288

Deposits - Balances (Details)

Deposits - Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deposits [Abstract]
Non-interest bearing demand	$ 5,691,429	$ 5,443,907
Interest bearing demand	5,132,937	4,960,800
Savings	2,690,445	2,603,570
Money market	8,568,965	8,114,415
Certificates of deposit	1,757,942	1,996,830
Total deposits	$ 23,841,718	$ 23,119,522

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Billions	Mar. 31, 2021	Dec. 31, 2020
Deposits [Abstract]
Municipal deposits	$ 2	$ 1.6

Deposits - Brokered Deposits (D

Deposits - Brokered Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
List of Company's Brokered deposits
Brokered deposits	$ 1,584,087	$ 1,579,271
Interest bearing demand
List of Company's Brokered deposits
Brokered deposits	399,000	433,790
Money market
List of Company's Brokered deposits
Brokered deposits	1,034,070	1,045,478
Certificates of deposit
List of Company's Brokered deposits
Brokered deposits	$ 151,017	$ 100,003

Borrowings - Borrowings and Wei

Borrowings - Borrowings and Weighted Average Interest Rates (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
By period to maturity:
Total borrowings, amount	$ 667,499	$ 1,321,714
Total borrowings, rate	4.22%	2.25%
Less than one year, amount	$ 31,679	$ 686,101
Less than one year, rate	0.10%	0.24%
Greater than five years, amount	$ 635,820	$ 635,613
Greater than five years, rate	4.43%	4.43%
FHLB borrowings
By period to maturity:
Total borrowings, amount	$ 0	$ 382,000
Total borrowings, rate	0.00%	0.35%
Repurchase agreements
By period to maturity:
Total borrowings, amount	$ 31,679	$ 27,101
Total borrowings, rate	0.10%	0.10%
Federal Funds Purchased
By period to maturity:
Total borrowings, amount	$ 0	$ 277,000
Total borrowings, rate	0.00%	0.11%
Subordinated Notes | Sterling Bancorp
By period to maturity:
Total borrowings, amount	$ 492,100
Subordinated Notes | Sterling National Bank
By period to maturity:
Total borrowings, amount	$ 143,757	$ 143,703
Total borrowings, rate	5.45%	5.45%
Subordinated Notes | Subordinated Notes Due 2029 | Sterling Bancorp
By period to maturity:
Total borrowings, amount	$ 270,366	$ 270,284
Total borrowings, rate	4.18%	4.17%
Subordinated Notes | Subordinated Notes Due 2030 | Sterling Bancorp
By period to maturity:
Total borrowings, amount	$ 221,697	$ 221,626
Total borrowings, rate	4.06%	4.06%

Borrowings - Narrative (Details

Borrowings - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Bank pledged mortgages	$ 6,200,000	$ 6,500,000
Increased borrowing capacity by pledging securities	2,100,000
Loss on extinguishment of borrowings	0		$ (744)
Sterling National Bank
Debt Instrument [Line Items]
Equity capital injection		$ 175,000
FHLB Borrowings
Debt Instrument [Line Items]
Unused borrowing capacity	6,200,000
Loss on extinguishment of borrowings	$ 0		$ (753)

Derivatives - Narrative (Detail

Derivatives - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative Instruments and Hedges, Assets [Abstract]
Cash Paid as STM	$ 60.5	$ 89.8

Derivatives - Derivative Inform

Derivatives - Derivative Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Summary of derivatives
Derivative assets, fair value	$ 105,772	$ 149,797
Derivative liabilities, fair value	$ 45,233	$ 60,004
Other assets
Summary of derivatives
Average maturity (in years)	4 years 3 months 14 days	4 years 4 months 24 days
Weighted average fixed rate	4.42%	4.44%
Other liabilities
Summary of derivatives
Average maturity (in years)	4 years 3 months 14 days	4 years 4 months 24 days
Weighted average fixed rate	4.42%	4.44%
Interest rate swap | Other assets
Summary of derivatives
Derivative assets, notional amount	$ 1,913,381	$ 1,913,607
Derivative assets, fair value	$ 105,772	149,797
Interest rate swap | Other assets | One-month LIBOR
Summary of derivatives
Basis spread	2.21%
Interest rate swap | Other liabilities
Summary of derivatives
Derivative liability, notional Amount	$ 1,913,381	1,913,607
Derivative liabilities, fair value	$ 45,233	60,004
Interest rate swap | Other liabilities | One-month LIBOR
Summary of derivatives
Basis spread	2.21%
Third-party interest rate swap | Other assets
Summary of derivatives
Derivative assets, notional amount	$ 0	0
Derivative assets, fair value	0	$ 0
Third-party interest rate swap | Other assets | One-month LIBOR
Summary of derivatives
Basis spread		2.20%
Third-party interest rate swap | Other liabilities
Summary of derivatives
Derivative liability, notional Amount	1,913,381	$ 1,913,607
Derivative liabilities, fair value	45,233	60,004
Customer interest rate swap | Other assets
Summary of derivatives
Derivative assets, notional amount	1,913,381	1,913,607
Derivative assets, fair value	105,772	149,797
Customer interest rate swap | Other liabilities
Summary of derivatives
Derivative liability, notional Amount	0	0
Derivative liabilities, fair value	$ 0	$ 0
Customer interest rate swap | Other liabilities | One-month LIBOR
Summary of derivatives
Basis spread		2.20%

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Efftective tax rate reconciliation:
Income before income tax expense	$ 122,105,000	$ 6,105,000
Tax at federal statutory rate of 21%	25,642,000	1,282,000
State and local income taxes, net of federal tax benefit	6,160,000	589,000
Tax exempt interest, net of disallowed interest	(5,777,000)	(7,409,000)
BOLI income	(1,004,000)	(1,111,000)
Low income housing tax credits and other benefits	(13,780,000)	(8,462,000)
Low income housing investment amortization expense	11,507,000	7,401,000
Tax rate adjustment benefit due to CARES Act net operating loss (“NOL”) carryback	0	(21,313,000)
Uncertain tax position reserve	0	11,480,000
Annual effective tax rate adjustment	0	8,248,000
Non-deductible compensation expense	640,000	0
Equity-based stock compensation (benefit) expense	(152,000)	491,000
FDIC insurance premium limitation	257,000	256,000
Other, net	(538,000)	506,000
Actual income tax expense (benefit)	$ 22,955,000	$ (8,042,000)
Effective income tax rate	18.80%	(131.70%)
Net deferred tax liability	$ 33,800,000		$ 43,300,000
Valuation allowance	0		$ 0
Nondeductible expense, restricted stock vesting Section 162(m) limitation	$ 517,000

Income Taxes - Schedule of Unre

Income Taxes - Schedule of Unrecognized Tax Benefits Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Uncertain Tax Positions [Roll Forward]
Uncertain tax positions beginning of period	$ 7,000	$ 0
Additions for tax positions related to prior tax years	0	11,480
Decrease due to settlement	0	0
Interest expense in tax positions	0	0
Uncertain tax positions at end of period	$ 7,000	$ 11,480

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-based Compensation Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant [Roll Forward]
Beginning balance (in shares)	1,811,418
Granted (in shares)	(1,138,246)
Stock awards vested (in shares)	0
Exercised (in shares)	0
Forfeited (in shares)	21,775
Canceled/expired (in shares)	31,109
Ending balance (in shares)	726,056
Stock options
Stock options outstanding - Number of shares
Beginning balance (in shares)	336,621
Granted (in shares)	0	0
Stock awards vested (in shares)	0
Exercised (in shares)	(73,946)
Forfeited (in shares)	0
Canceled/expired (in shares)	0
Ending balance (in shares)	262,675
Exercisable at end of period (in shares)	262,675
Stock options outstanding - Weighted average exercise price
Beginning balance (USD per share)	$ 11.41
Granted (USD per share)	0
Stock awards vested (USD per share)	0
Exercised (USD per share)	10.17
Forfeited (USD per share)	0
Canceled/expired (USD per share)	0
Ending balance (USD per share)	11.41
Exercisable at end of period (USD per share)	$ 11.41
Recognition and Retention Plan | Non-vested stock awards/performance units
Non-vested stock awards/stock units outstanding - Number of shares
Beginning balance (in shares)	2,993,643
Granted (in shares)	1,138,246
Stock awards vested (in shares)	(820,633)
Forfeited (in shares)	(21,775)
Canceled/expired (in shares)	(31,109)
Ending balance (in shares)	3,258,372
Non-vested stock awards/stock units outstanding - Weighted average grant date fair value
Beginning balance (USD per share)	$ 19.54
Granted (USD per share)	20.36
Stock awards vested (USD per share)	21.31
Forfeited (USD per share)	19.05
Canceled/expired (USD per share)	20.85
Ending balance (USD per share)	$ 19.37

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options outstanding	$ 3,100,000
Stock-based compensation expense	6,617,000	$ 6,006,000
Unrecognized stock-based compensation, non-vested stock awards/performance units	48,600,000
Non-vested stock awards/performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 6,617,000	$ 6,006,000
Weighted-average period total unrecognized compensation cost related to non-vested shares granted (over)	1 year 11 months 19 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of share options (in shares)	0	0
Stock-based compensation expense	$ 0	$ 0

Stock-Based Compensation - St_2

Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Retirement Benefits [Abstract]
Stock-based compensation expense	$ 6,617	$ 6,006
Stock-based compensation expense, income tax benefit	1,224	1,051
Stock options & other stock transactions, net	$ 752	$ 414

Other Non-Interest Expense, O_3

Other Non-Interest Expense, Other Assets and Other Liabilities - Schedule of Other Non-Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income and Expenses [Abstract]
Depreciation expense on operating leases	$ 3,124	$ 3,492
Advertising and promotion	1,708	1,983
Communications	1,427	1,630
Residential mortgage loans servicing	1,449	1,377
Commercial loan servicing	979	1,025
Insurance & surety bond premium	914	1,091
Operational losses	593	605
Other	4,858	5,460
Total other non-interest expense	$ 15,052	$ 16,663

Other Non-Interest Expense, O_4

Other Non-Interest Expense, Other Assets and Other Liabilities - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other Income and Expenses [Abstract]
Low income housing tax credit investments	$ 484,885	$ 488,303
Right of use asset for operating leases	101,495	105,667
Derivative assets, fair value	105,772	149,797
Cash on deposit as swap collateral / net of settlement	69,014	82,478
Operating leases - equipment and vehicles leased to others	51,999	55,224
Other asset balances	193,003	181,934
Total other assets	$ 1,006,168	$ 1,063,403

Other Non-Interest Expense, O_5

Other Non-Interest Expense, Other Assets and Other Liabilities - Schedule of Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other Income and Expenses [Abstract]
Commitment to fund low income housing tax credit investments	$ 276,974	$ 283,849
Present value of lease liabilities	109,720	113,405
Payroll finance and factoring liabilities	125,831	115,802
Swaps	45,233	60,004
Other liability balances	144,898	155,642
Total other liabilities	$ 702,656	$ 728,702

Earnings Per Common Share - (De

Earnings Per Common Share - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 97,187	$ 12,171
Weighted average common shares outstanding for computation of basic EPS (in shares)	191,890,512	196,344,061
Common-equivalent shares due to the dilutive effect of stock options and unvested performance share grants (in shares)	731,395	364,977
Weighted average common shares for computation of diluted EPS (in shares)	192,621,907	196,709,038
EPS:
Basic (USD per share)	$ 0.51	$ 0.06
Diluted (USD per share)	$ 0.50	$ 0.06
Weighted average common shares that could be exercised that were anti-dilutive for the period (in shares)	0	23,590

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Long-term debt	$ 667,499	$ 1,321,714
Period of loan term eligible for inclusion in Tier 2 capital decreases	5 years
Sterling National Bank
Class of Stock [Line Items]
Subordinated Notes	$ 143,757	143,703
Sterling National Bank | Subordinated Notes
Class of Stock [Line Items]
Long-term debt	143,757	143,703
Sterling National Bank | Sterling National Bank
Class of Stock [Line Items]
Subordinated Notes	143,800
Sterling Bancorp
Class of Stock [Line Items]
Subordinated Notes	492,063	$ 491,910
Sterling Bancorp | Subordinated Notes
Class of Stock [Line Items]
Long-term debt	492,100
Sterling Bancorp | Sterling National Bank
Class of Stock [Line Items]
Subordinated Notes	$ 97,900

Stockholders' Equity - Complian

Stockholders' Equity - Compliance with Regulatory Capital Requirements (Schedule) (Details) $ in Thousands	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Sterling National Bank
Common equity tier 1 to RWA:
Tier 1 common equity, actual, capital amount	$ 3,269,545	$ 3,198,145
Tier 1 common equity, actual, ratio	0.1404	0.1338
Tier 1 common equity required for minimum capital adequacy, fully phased-in, capital amount	$ 1,630,407	$ 1,673,516
Tier 1 common equity required for minimum capital adequacy, phase-in schedule, ratio	7.00%	7.00%
Tier 1 common equity required to be well capitalized, capital amount	$ 1,513,949	$ 1,553,979
Tier 1 common equity required to be well capitalized, ratio	6.50%	6.50%
Tier 1 capital to RWA:
Tier 1 risk-based capital, actual, capital amount	$ 3,269,545	$ 3,198,145
Tier 1 risk-based capital, ratio	0.1404	0.1338
Tier 1 risk-based capital required for minimum capital adequacy, fully phased-in, capital amount	$ 1,979,780	$ 2,032,127
Tier 1 risk-based capital required for minimum capital adequacy, fully phased-in, ratio	8.50%	8.50%
Tier 1 risk-based capital required to be well capitalized, capital amount	$ 1,863,322	$ 1,912,590
Tier 1 risk-based capital required to be well capitalized, ratio	0.0800	0.0800
Total capital to RWA:
Total risk-based capital, actual, capital amount	$ 3,590,726	$ 3,521,458
Total risk-based capital, ratio	0.1542	0.1473
Total risk-based capital required for minimum capital adequacy, fully phased-in, capital amount	$ 2,445,610	$ 2,510,274
Total risk-based capital required for minimum capital adequacy, fully phased-in, ratio	10.50%	10.50%
Total risk-based capital required to be well capitalized, capital amount	$ 2,329,152	$ 2,390,737
Total risk-based capital required to be well capitalized, ratio	0.1000	0.1000
Tier 1 leverage ratio:
Tier 1 (core) capital, actual, capital amount	$ 3,269,545	$ 3,198,145
Tier 1 (core) capital, ratio	0.1176	0.1133
Tier 1 (core) capital required for minimum capital adequacy, fully phased-in, capital amount	$ 1,111,894	$ 1,128,913
Tier 1 (core) capital required for minimum capital adequacy, fully phased-in, ratio	4.00%	4.00%
Tier 1 (core) capital required to be well capitalized, capital amount	$ 1,389,867	$ 1,411,142
Tier 1 (core) capital required to be well capitalized, ratio	0.0500	0.0500
Sterling Bancorp
Common equity tier 1 to RWA:
Tier 1 common equity, actual, capital amount	$ 2,786,496	$ 2,727,385
Tier 1 common equity, actual, ratio	0.1195	0.1139
Tier 1 common equity required for minimum capital adequacy, fully phased-in, capital amount	$ 1,632,817	$ 1,675,747
Tier 1 common equity required for minimum capital adequacy, phase-in schedule, ratio	7.00%	7.00%
Tier 1 capital to RWA:
Tier 1 risk-based capital, actual, capital amount	$ 2,922,954	$ 2,864,074
Tier 1 risk-based capital, ratio	0.1253	0.1196
Tier 1 risk-based capital required for minimum capital adequacy, fully phased-in, capital amount	$ 1,982,706	$ 2,034,836
Tier 1 risk-based capital required for minimum capital adequacy, fully phased-in, ratio	8.50%	8.50%
Total capital to RWA:
Total risk-based capital, actual, capital amount	$ 3,690,353	$ 3,638,033
Total risk-based capital, ratio	0.1582	0.1520
Total risk-based capital required for minimum capital adequacy, fully phased-in, capital amount	$ 2,449,225	$ 2,513,621
Total risk-based capital required for minimum capital adequacy, fully phased-in, ratio	10.50%	10.50%
Tier 1 leverage ratio:
Tier 1 (core) capital, actual, capital amount	$ 2,922,954	$ 2,864,074
Tier 1 (core) capital, ratio	0.1050	0.1014
Tier 1 (core) capital required for minimum capital adequacy, fully phased-in, capital amount	$ 1,113,426	$ 1,130,362
Tier 1 (core) capital required for minimum capital adequacy, fully phased-in, ratio	4.00%	4.00%

Commitments and Contingencies_2

Commitments and Contingencies - Off-Balance Sheet Financial Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loan origination commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Lending-related instruments	$ 598,171	$ 641,965
Unused lines of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Lending-related instruments	1,493,031	1,623,745
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Lending-related instruments	$ 175,305	$ 181,890

Commitments and Contingencies_3

Commitments and Contingencies - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Allowance for credit losses - loan commitments	$ 6,700,000		$ 6,700,000
Off-balance sheet credit loss	0	$ 0
Litigation accrual	$ 0		$ 0

Commitment and Contingencies -

Commitment and Contingencies - Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2021	$ 13,805
2022	18,069
2023	16,605
2024	14,790
2025	12,176
2026	11,054
2027 and thereafter	39,788
Total lease payments	126,287
Interest	16,567
Present value of lease liabilities	$ 109,720	$ 113,405

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial assets:
Securities available for sale, at estimated fair value	$ 2,524,671	$ 2,298,618
Swaps	105,772	149,797
Financial liabilities:
Swaps	45,233	60,004
Level 1 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Swaps	0	0
Financial liabilities:
Swaps	0	0
Level 2 inputs
Financial assets:
Securities available for sale, at estimated fair value	2,524,671	2,298,618
Swaps	105,772	149,797
Financial liabilities:
Swaps	45,233	60,004
Level 3 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Swaps	0	0
Financial liabilities:
Swaps	0	0
Fair Value, Measurements, Recurring
Financial assets:
Securities available for sale, at estimated fair value	2,524,671	2,298,618
Swaps	105,772	149,797
Total assets	2,630,443	2,448,415
Financial liabilities:
Swaps	45,233	60,004
Total liabilities	45,233	60,004
Fair Value, Measurements, Recurring | Level 1 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Swaps	0	0
Total assets	0	0
Financial liabilities:
Swaps	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 2 inputs
Financial assets:
Securities available for sale, at estimated fair value	2,524,671	2,298,618
Swaps	105,772	149,797
Total assets	2,630,443	2,448,415
Financial liabilities:
Swaps	45,233	60,004
Total liabilities	45,233	60,004
Fair Value, Measurements, Recurring | Level 3 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Swaps	0	0
Total assets	0	0
Financial liabilities:
Swaps	0	0
Total liabilities	0	0
Agency-backed
Financial assets:
Securities available for sale, at estimated fair value	864,793	918,260
Agency-backed | Fair Value, Measurements, Recurring
Financial assets:
Securities available for sale, at estimated fair value	864,793	918,260
Agency-backed | Fair Value, Measurements, Recurring | Level 1 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Agency-backed | Fair Value, Measurements, Recurring | Level 2 inputs
Financial assets:
Securities available for sale, at estimated fair value	864,793	918,260
Agency-backed | Fair Value, Measurements, Recurring | Level 3 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
CMOs/Other MBS
Financial assets:
Securities available for sale, at estimated fair value	314,752	373,284
CMOs/Other MBS | Fair Value, Measurements, Recurring
Financial assets:
Securities available for sale, at estimated fair value	314,752	373,284
CMOs/Other MBS | Fair Value, Measurements, Recurring | Level 1 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
CMOs/Other MBS | Fair Value, Measurements, Recurring | Level 2 inputs
Financial assets:
Securities available for sale, at estimated fair value	314,752	373,284
CMOs/Other MBS | Fair Value, Measurements, Recurring | Level 3 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Total residential MBS
Financial assets:
Securities available for sale, at estimated fair value	1,179,545	1,291,544
Total residential MBS | Fair Value, Measurements, Recurring
Financial assets:
Securities available for sale, at estimated fair value	1,179,545	1,291,544
Total residential MBS | Fair Value, Measurements, Recurring | Level 1 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Total residential MBS | Fair Value, Measurements, Recurring | Level 2 inputs
Financial assets:
Securities available for sale, at estimated fair value	1,179,545	1,291,544
Total residential MBS | Fair Value, Measurements, Recurring | Level 3 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Federal agencies
Financial assets:
Securities available for sale, at estimated fair value		156,467
Federal agencies | Fair Value, Measurements, Recurring
Financial assets:
Securities available for sale, at estimated fair value	343,472	156,467
Federal agencies | Fair Value, Measurements, Recurring | Level 1 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Federal agencies | Fair Value, Measurements, Recurring | Level 2 inputs
Financial assets:
Securities available for sale, at estimated fair value	343,472	156,467
Federal agencies | Fair Value, Measurements, Recurring | Level 3 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Corporate
Financial assets:
Securities available for sale, at estimated fair value	612,924	463,512
Corporate | Fair Value, Measurements, Recurring
Financial assets:
Securities available for sale, at estimated fair value	612,924	463,512
Corporate | Fair Value, Measurements, Recurring | Level 1 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Corporate | Fair Value, Measurements, Recurring | Level 2 inputs
Financial assets:
Securities available for sale, at estimated fair value	612,924	463,512
Corporate | Fair Value, Measurements, Recurring | Level 3 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
State and municipal
Financial assets:
Securities available for sale, at estimated fair value	388,730	387,095
State and municipal | Fair Value, Measurements, Recurring
Financial assets:
Securities available for sale, at estimated fair value	388,730	387,095
State and municipal | Fair Value, Measurements, Recurring | Level 1 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
State and municipal | Fair Value, Measurements, Recurring | Level 2 inputs
Financial assets:
Securities available for sale, at estimated fair value	388,730	387,095
State and municipal | Fair Value, Measurements, Recurring | Level 3 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Total other securities
Financial assets:
Securities available for sale, at estimated fair value	1,345,126	1,007,074
Total other securities | Fair Value, Measurements, Recurring
Financial assets:
Securities available for sale, at estimated fair value	1,345,126	1,007,074
Total other securities | Fair Value, Measurements, Recurring | Level 1 inputs
Financial assets:
Securities available for sale, at estimated fair value	0	0
Total other securities | Fair Value, Measurements, Recurring | Level 2 inputs
Financial assets:
Securities available for sale, at estimated fair value	1,345,126	1,007,074
Total other securities | Fair Value, Measurements, Recurring | Level 3 inputs
Financial assets:
Securities available for sale, at estimated fair value	$ 0	$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - Measurement Input, Appraised Value	Mar. 31, 2021
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input	0.04
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input	0.10

Fair Value Measurements - Colla

Fair Value Measurements - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	$ 0	$ 0
Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	20,772,549	21,791,489
Total | Fair Value Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	68,120	47,338
Total | Fair Value Measurements, Nonrecurring | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	68,120	47,338
Total | Fair Value Measurements, Nonrecurring | Traditional C&I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	7,376	10,916
Total | Fair Value Measurements, Nonrecurring | Traditional C&I | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Traditional C&I | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Traditional C&I | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	7,376	10,916
Total | Fair Value Measurements, Nonrecurring | Asset-based lending
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	1,846	1,899
Total | Fair Value Measurements, Nonrecurring | Asset-based lending | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Asset-based lending | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Asset-based lending | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	1,846	1,899
Total | Fair Value Measurements, Nonrecurring | Payroll finance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	2,313	2,300
Total | Fair Value Measurements, Nonrecurring | Payroll finance | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Payroll finance | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Payroll finance | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	2,313	2,300
Total | Fair Value Measurements, Nonrecurring | Equipment financing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	2,671
Total | Fair Value Measurements, Nonrecurring | Equipment financing | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0
Total | Fair Value Measurements, Nonrecurring | Equipment financing | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0
Total | Fair Value Measurements, Nonrecurring | Equipment financing | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	2,671
Total | Fair Value Measurements, Nonrecurring | Commercial real estate (“CRE”)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	25,156	27,323
Total | Fair Value Measurements, Nonrecurring | Commercial real estate (“CRE”) | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Commercial real estate (“CRE”) | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Commercial real estate (“CRE”) | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	25,156	27,323
Total | Fair Value Measurements, Nonrecurring | Acquisition, development and construction (“ADC”)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	25,000
Total | Fair Value Measurements, Nonrecurring | Acquisition, development and construction (“ADC”) | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0
Total | Fair Value Measurements, Nonrecurring | Acquisition, development and construction (“ADC”) | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0
Total | Fair Value Measurements, Nonrecurring | Acquisition, development and construction (“ADC”) | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	25,000
Total | Fair Value Measurements, Nonrecurring | Residential mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	1,307	1,307
Total | Fair Value Measurements, Nonrecurring | Residential mortgage | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Residential mortgage | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Residential mortgage | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	1,307	1,307
Total | Fair Value Measurements, Nonrecurring | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	2,451	3,593
Total | Fair Value Measurements, Nonrecurring | Consumer | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Consumer | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	0	0
Total | Fair Value Measurements, Nonrecurring | Consumer | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	$ 2,451	$ 3,593

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial assets:
Securities available for sale, at estimated fair value	$ 2,524,671	$ 2,298,618
Securities HTM	1,826,232	1,874,504
Swaps	105,772	149,797
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Swaps	45,233	60,004
Sterling Bancorp
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated Notes	492,063	491,910
Sterling National Bank
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated Notes	143,757	143,703
Carrying amount
Financial assets:
Cash and cash equivalents	935,633	305,002
Securities available for sale, at estimated fair value	2,524,671	2,298,618
Securities HTM	1,716,786	1,740,838
Loans held for sale	36,237	11,749
Portfolio loans, net	20,828,787	21,522,309
Accrued interest receivable on securities	32,979	26,508
Accrued interest receivable on loans	70,344	70,997
FHLB stock and FRB stock	153,968	166,190
Swaps	105,772	149,797
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Non-maturity deposits	22,083,776	21,122,692
Certificates of deposit	1,757,942	1,996,830
FHLB borrowings		382,000
Other borrowings	31,679	304,101
Mortgage escrow funds	82,245	59,686
Accrued interest payable on deposits	597	1,068
Accrued interest payable on borrowings	10,234	3,425
Swaps	45,233	60,004
Carrying amount | Sterling Bancorp
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated Notes	492,063	143,703
Carrying amount | Sterling National Bank
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated Notes	143,757	491,910
Level 1 inputs
Financial assets:
Cash and cash equivalents	935,633	305,002
Securities available for sale, at estimated fair value	0	0
Securities HTM	0	0
Loans held for sale	0	0
Portfolio loans, net	0	0
Accrued interest receivable on securities	0	0
Accrued interest receivable on loans	0	0
FHLB stock and FRB stock	0	0
Swaps	0	0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Non-maturity deposits	22,083,776	21,122,692
Certificates of deposit	0	0
FHLB borrowings		0
Other borrowings	0	0
Mortgage escrow funds	0	0
Accrued interest payable on deposits	0	0
Accrued interest payable on borrowings	0	0
Swaps	0	0
Level 1 inputs | Sterling Bancorp
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated Notes	0	0
Level 1 inputs | Sterling National Bank
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated Notes	0	0
Level 2 inputs
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale, at estimated fair value	2,524,671	2,298,618
Securities HTM	1,826,232	1,874,504
Loans held for sale	36,237	11,749
Portfolio loans, net	0	0
Accrued interest receivable on securities	32,979	26,508
Accrued interest receivable on loans	0	0
FHLB stock and FRB stock	0	0
Swaps	105,772	149,797
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Non-maturity deposits	0	0
Certificates of deposit	1,758,273	2,002,702
FHLB borrowings		382,000
Other borrowings	31,679	304,101
Mortgage escrow funds	82,245	59,686
Accrued interest payable on deposits	597	1,068
Accrued interest payable on borrowings	10,234	3,425
Swaps	45,233	60,004
Level 2 inputs | Sterling Bancorp
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated Notes	145,000	145,870
Level 2 inputs | Sterling National Bank
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated Notes	496,330	506,497
Level 3 inputs
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale, at estimated fair value	0	0
Securities HTM	0	0
Loans held for sale	0	0
Portfolio loans, net	20,772,549	21,791,489
Accrued interest receivable on securities	0	0
Accrued interest receivable on loans	70,344	70,997
FHLB stock and FRB stock	0	0
Swaps	0	0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Non-maturity deposits	0	0
Certificates of deposit	0	0
FHLB borrowings		0
Other borrowings	0	0
Mortgage escrow funds	0	0
Accrued interest payable on deposits	0	0
Accrued interest payable on borrowings	0	0
Swaps	0	0
Level 3 inputs | Sterling Bancorp
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated Notes	0	0
Level 3 inputs | Sterling National Bank
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated Notes	$ 0	$ 0

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Components of AOCI (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deferred tax benefit (expense) related to other comprehensive income	$ (21,999)	$ (32,399)
Total stockholders’ equity	4,620,164	4,590,514	$ 4,422,424	$ 4,530,113
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	80,878	115,523
Deferred tax benefit (expense) related to other comprehensive income	(22,355)	(31,931)
Total stockholders’ equity	58,523	83,592	67,249	38,056
Securities transferred to held to maturity
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	(303)	(348)
Deferred tax benefit (expense) related to other comprehensive income	84	96
Total stockholders’ equity	(219)	(252)	(468)	(538)
Retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	(985)	2,040
Deferred tax benefit (expense) related to other comprehensive income	272	(564)
Total stockholders’ equity	(713)	1,476	840	2,698
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total stockholders’ equity	$ 57,591	$ 84,816	$ 67,621	$ 40,216

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning	$ 4,590,514	$ 4,530,113
Other comprehensive income before reclassification	(24,549)	35,280
Amounts reclassified from AOCI	(2,676)	(7,875)
Total other comprehensive (loss) income	(27,225)	27,405
Balance, ending	4,620,164	4,422,424
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning	83,592	38,056
Other comprehensive income before reclassification	(24,549)	35,280
Amounts reclassified from AOCI	(520)	(6,087)
Total other comprehensive (loss) income	(25,069)	29,193
Balance, ending	58,523	67,249
Securities transferred to held to maturity
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning	(252)	(538)
Other comprehensive income before reclassification	0	0
Amounts reclassified from AOCI	33	70
Total other comprehensive (loss) income	33	70
Balance, ending	(219)	(468)
Retirement plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning	1,476	2,698
Other comprehensive income before reclassification	0	0
Amounts reclassified from AOCI	(2,189)	(1,858)
Total other comprehensive (loss) income	(2,189)	(1,858)
Balance, ending	(713)	840
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning	84,816	40,216
Total other comprehensive (loss) income	(27,225)	27,405
Balance, ending	$ 57,591	$ 67,621

Subsequent Event - Narrative (D

Subsequent Event - Narrative (Details) $ in Thousands	Apr. 19, 2021USD ($)directorshares	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Subsequent Event [Line Items]
Total assets		$ 29,914,282	$ 29,820,138
Portfolio loans, net		20,828,787	21,522,309
Deposits		$ 23,841,718	$ 23,119,522
Forecast
Subsequent Event [Line Items]
Merger, breakup fee	$ 185,000
Subsequent Event
Subsequent Event [Line Items]
Merger, shares received per common stock owned (in shares) | shares	0.463
Merger, number of board of directors | director	15
Subsequent Event | Webster
Subsequent Event [Line Items]
Merger, percentage of ownership after transaction	50.40%
Merger, number of board of directors | director	8
Subsequent Event | Sterling
Subsequent Event [Line Items]
Merger, percentage of ownership after transaction	49.60%
Merger, number of board of directors | director	7
Subsequent Event | Webster, After Merger | Pro Forma
Subsequent Event [Line Items]
Total assets	$ 63,000,000
Portfolio loans, net	42,000,000
Deposits	$ 52,000,000