Sterling Bancorp (STL) 10-Q 3 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 02, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	STERLING BANCORP
Entity Central Index Key	1,070,154
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		224,707,726

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ASSETS:
Cash and due from banks	$ 407,203	$ 293,646
Securities:
Available for sale, at fair value	2,579,076	1,727,417
Held to maturity, at amortized cost (fair value of $1,932,755 and $1,357,997 at September 30, 2017 and December 31, 2016, respectively)	1,936,574	1,391,421
Total securities	4,515,650	3,118,838
Loans held for sale	0	41,889
Portfolio loans	10,493,535	9,527,230
Allowance for loan losses	(72,128)	(63,622)
Portfolio loans, net	10,421,407	9,463,608
Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank (“FRB”) stock, at cost	191,276	135,098
Accrued interest receivable	57,561	43,319
Premises and equipment, net	56,378	57,318
Goodwill	696,600	696,600
Other intangible assets, net	59,690	66,353
Bank owned life insurance	204,281	199,889
Other real estate owned	11,697	13,619
Other assets	158,354	48,270
Total assets	16,780,097	14,178,447
LIABILITIES:
Deposits	11,043,438	10,068,259
FHLB borrowings	3,016,000	1,791,000
Other borrowings	188,403	16,642
Senior Notes	76,719	76,469
Subordinated Notes	172,661	172,501
Mortgage escrow funds	19,148	13,572
Other liabilities	292,248	184,821
Total liabilities	14,808,617	12,323,264
Commitments and Contingent liabilities (See Note 16. “Commitments and Contingencies”)	0	0
STOCKHOLDERS’ EQUITY:
Preferred stock (par value $0.01 per share; 10,000,000 shares authorized; none issued or outstanding)	0	0
Common stock (par value $0.01 per share; 310,000,000 shares authorized at September 30, 2017; 190,000,000 shares authorized at December 31, 2016; 141,043,149 shares issued at September 30, 2017 and December 31, 2016; 135,807,544 and 135,257,570 shares outstanding at September 30, 2017 and December 31, 2016, respectively)	1,411	1,411
Additional paid-in capital	1,590,752	1,597,287
Treasury stock, at cost (5,235,605 shares at September 30, 2017 and 5,785,579 at December 31, 2016)	(59,674)	(66,188)
Retained earnings	452,650	349,308
Accumulated other comprehensive (loss), net of tax (benefit) of $(8,918) at September 30, 2017 and $(17,390) at December 31, 2016	(13,659)	(26,635)
Total stockholders’ equity	1,971,480	1,855,183
Total liabilities and stockholders’ equity	$ 16,780,097	$ 14,178,447

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Securities held to maturity	$ 1,932,755	$ 1,357,997
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	310,000,000	190,000,000
Common stock, shares issued	141,043,149	141,043,149
Common stock, shares outstanding	135,807,544	135,257,570
Treasury stock, shares	5,235,605	5,785,579
Accumulated other comprehensive income, tax	$ (8,918)	$ (17,390)

Consolidated Income Statements

Consolidated Income Statements (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest and dividend income:
Loans and loan fees	$ 119,898	$ 100,503	$ 336,308	$ 286,195
Securities taxable	15,141	9,870	40,536	32,548
Securities non-taxable	8,542	6,751	23,951	16,501
Other earning assets	2,111	1,037	5,160	3,232
Total interest and dividend income	145,692	118,161	405,955	338,476
Interest expense:
Deposits	13,392	9,201	33,805	23,938
Borrowings	12,227	5,830	30,029	17,518
Total interest expense	25,619	15,031	63,834	41,456
Net interest income	120,073	103,130	342,121	297,020
Provisions for loan losses	5,000	5,500	14,000	14,500
Net interest income after provision for loan losses	115,073	97,630	328,121	282,520
Non-interest income:
Accounts receivable management / factoring commissions and other fees	4,764	4,898	12,670	13,548
Mortgage banking income	121	1,153	522	5,522
Deposit fees and service charges	3,309	3,407	9,893	11,981
Net (loss) gain on sale of securities	(21)	3,433	(274)	7,624
Bank owned life insurance	1,320	1,891	4,342	4,499
Investment management fees	271	1,086	825	3,144
Other	4,224	3,171	12,464	8,593
Total non-interest income	13,988	19,039	40,442	54,911
Non-interest expense:
Compensation and benefits	32,433	32,501	95,218	93,857
Stock-based compensation plans	1,969	1,673	5,602	4,960
Occupancy and office operations	8,583	8,021	25,550	26,113
Amortization of intangible assets	2,166	3,241	6,582	9,535
FDIC insurance and regulatory assessments	2,310	2,151	6,232	6,709
Other real estate owned expense, net	894	721	2,682	1,844
Merger-related expense	4,109	0	9,002	265
Charge for asset write-downs, retention and severance	0	2,000	603	4,485
Loss on extinguishment of borrowings	0	1,013	0	9,729
Other	10,153	10,935	31,153	33,330
Total non-interest expense	62,617	62,256	182,624	190,827
Income before income tax expense	66,444	54,413	185,939	146,604
Income tax expense	21,592	16,991	59,620	47,646
Net income	$ 44,852	$ 37,422	$ 126,319	$ 98,958
Weighted average common shares:
Basic (in shares)	135,346,791	130,239,193	135,276,634	130,049,358
Diluted (in shares)	135,950,160	130,875,614	135,895,513	130,645,705
Earnings per common share:
Basic (USD per share)	$ 0.33	$ 0.29	$ 0.93	$ 0.76
Diluted (USD per share)	$ 0.33	$ 0.29	$ 0.93	$ 0.76

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 44,852	$ 37,422	$ 126,319	$ 98,958
Other comprehensive income (loss), before tax:
Change in unrealized holding gains (losses) on securities available for sale	4,209	(2,112)	20,374	39,691
Accretion of net unrealized loss on securities transferred to held to maturity	238	542	726	1,243
Reclassification adjustment for net realized losses (gains) included in net income	21	(3,433)	274	(7,624)
Change in the actuarial loss of defined benefit plan and post-retirement benefit plans	10	(18)	74	379
Total other comprehensive income (loss), before tax	4,478	(5,021)	21,448	33,689
Deferred tax (expense) benefit related to other comprehensive income	(1,769)	1,984	(8,472)	(13,672)
Other comprehensive income (loss), net of tax	2,709	(3,037)	12,976	20,017
Comprehensive income	$ 47,561	$ 34,385	$ 139,295	$ 118,975

Consolidated Statement of Chang

Consolidated Statement of Changes In Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Treasury stock	Retained earnings	Accumulated other comprehensive (loss) income
Balance at Dec. 31, 2015	$ 1,665,073	$ 1,367	$ 1,506,612	$ (76,190)	$ 245,408	$ (12,124)
Balance (in shares) at Dec. 31, 2015		130,006,926
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	98,958				98,958
Other comprehensive income	20,017					20,017
Stock option & other stock transactions, net	4,151		428	4,807	(1,084)
Stock option & other stock transactions, net (in shares)		413,819
Restricted stock awards, net	4,252		(2,263)	5,121	1,394
Restricted stock awards, net (in shares)		432,928
Cash dividends declared ($0.21 per common share)	(27,291)				(27,291)
Balance at Sep. 30, 2016	1,765,160	$ 1,367	1,504,777	(66,262)	317,385	7,893
Balance (in shares) at Sep. 30, 2016		130,853,673
Balance at Dec. 31, 2015	1,665,073	$ 1,367	1,506,612	(76,190)	245,408	(12,124)
Balance (in shares) at Dec. 31, 2015		130,006,926
Balance at Dec. 31, 2016	1,855,183	$ 1,411	1,597,287	(66,188)	349,308	(26,635)
Balance (in shares) at Dec. 31, 2016		135,257,570
Balance at Jun. 30, 2016						10,930
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	37,422
Other comprehensive income	(3,037)
Balance at Sep. 30, 2016	1,765,160	$ 1,367	1,504,777	(66,262)	317,385	7,893
Balance (in shares) at Sep. 30, 2016		130,853,673
Balance at Dec. 31, 2016	1,855,183	$ 1,411	1,597,287	(66,188)	349,308	(26,635)
Balance (in shares) at Dec. 31, 2016		135,257,570
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	126,319				126,319
Other comprehensive income	12,976					12,976
Stock option & other stock transactions, net	1,337		146	1,627	(436)
Stock option & other stock transactions, net (in shares)		118,598
Restricted stock awards, net	4,012		(6,681)	4,887	5,806
Restricted stock awards, net (in shares)		431,376
Cash dividends declared ($0.21 per common share)	(28,347)				(28,347)
Balance at Sep. 30, 2017	1,971,480	$ 1,411	1,590,752	(59,674)	452,650	(13,659)
Balance (in shares) at Sep. 30, 2017		135,807,544
Balance at Jun. 30, 2017						(16,368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	44,852
Other comprehensive income	2,709
Balance at Sep. 30, 2017	$ 1,971,480	$ 1,411	$ 1,590,752	$ (59,674)	$ 452,650	$ (13,659)
Balance (in shares) at Sep. 30, 2017		135,807,544

Consolidated Statement of Chan7

Consolidated Statement of Changes In Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends paid (usd per share)	$ 0.21	$ 0.21

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 44,852	$ 37,422	$ 126,319	$ 98,958
Adjustments to reconcile net income to net cash provided by operating activities:
Provisions for loan losses	5,000	5,500	14,000	14,500
Net loss from write-downs and sales of other real estate owned			1,647	280
Net loss on extinguishment of debt (FHLB borrowings and Senior Notes)	0	(1,013)	0	(9,729)
Depreciation of premises and equipment			6,639	6,282
Asset write-downs, retention and severance compensation and other restructuring charges			603	4,485
Amortization of intangible assets	2,166	3,241	6,582	9,535
Amortization of low income housing tax credits			414	390
Net loss (gain) on sale of securities	21	(3,433)	274	(7,624)
Net gain on loans held for sale			(952)	(6,228)
Net amortization of premiums on securities			16,635	11,100
Net accretion of purchase discount and amortization of net deferred loan costs			(10,515)	(13,590)
Net accretion of debt issuance costs and amortization of premium on borrowings			410	1,140
Restricted stock compensation expense			5,456	4,615
Stock option compensation expense			146	345
Originations of loans held for sale			(5,159)	(385,135)
Proceeds from sales of loans held for sale			48,000	343,778
Increase in cash surrender value of bank owned life insurance			(4,442)	(4,499)
Deferred income tax (benefit) expense			(1,933)	250
Other adjustments (principally net changes in other assets and other liabilities)			(16,761)	(12,479)
Net cash provided by operating activities			187,363	75,832
Purchases of securities:
Available for sale			(1,017,426)	(546,353)
Held to maturity			(619,649)	(714,868)
Proceeds from maturities, calls and other principal payments on securities:
Available for sale			164,598	225,346
Held to maturity			64,158	52,040
Proceeds from sales of securities available for sale	5,015	300,047	15,247	858,531
Portfolio loan originations, net			(900,269)	(903,802)
Portfolio loans purchased			(94,912)	(163,320)
Proceeds from sale of loans held for investment			28,990	81,758
Purchases of FHLB and FRB stock, net			(56,178)	9,088
Proceeds from sales of other real estate owned			5,182	3,416
Purchases of premises and equipment			(5,699)	(2,229)
Proceeds from BOLI death benefit and redemption from termination of bank owned life insurance			50	2,231
Purchases of low income housing tax credits			(8,260)	0
Cash paid for acquisition, net			0	(346,690)
Net cash (used in) investing activities			(2,424,168)	(1,444,852)
Cash flows from financing activities:
Net increase in transaction, savings and money market deposits			992,573	1,565,798
Net (decrease) increase in certificates of deposit			(17,394)	51,448
Net increase (decrease) in short-term FHLB borrowings			200,000	(86,000)
Advances of term FHLB borrowings			1,975,000	700,000
Repayments of term FHLB borrowings			(950,000)	(842,396)
Repayment of Senior Notes			0	(23,793)
Net increase in other borrowings			171,761	4,625
Proceeds from issuance of Bank Subordinated Notes			0	171,813
Net increase in mortgage escrow funds			5,576	2,058
Proceeds from stock option exercises	65	2,278	1,193	3,703
Cash dividends paid			(28,347)	(27,291)
Net cash provided by financing activities			2,350,362	1,519,965
Net increase in cash and cash equivalents			113,557	150,945
Cash and cash equivalents at beginning of period			293,646	229,513	$ 229,513
Cash and cash equivalents at end of period	$ 407,203	$ 380,458	407,203	380,458	$ 293,646
Supplemental cash flow information:
Interest payments			57,357	39,174
Income tax payments			67,625	25,880
Real estate acquired in settlement of loans			4,907	4,780
Unsettled securities transactions			30,594	0
Loans transferred from held for investment to held for sale			28,990	81,758
Non-cash assets acquired:
Total loans, net			0	320,447
Accrued interest receivable			0	1,443
Goodwill			0	25,698
Customer list			0	1,500
Premises and equipment, net			0	176
Other assets			0	2,265
Total non-cash assets acquired			0	351,529
Liabilities assumed:
Other liabilities			0	4,839
Total liabilities assumed			0	4,839
Net non-cash assets acquired			0	346,690
Cash and cash equivalents received in acquisitions			0	4,762
Total consideration paid			$ 0	$ 351,452

Basis of Financial Statement Pr

Basis of Financial Statement Presentation	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Financial Statement Presentation	Basis of Financial Statement Presentation (a) Nature of Operations Sterling Bancorp (the “Company”) is a Delaware corporation, a bank holding company and a financial holding company headquartered in Montebello, 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 the Company’s 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, 2016 , included in our Annual Report on Form 10-K, as filed with the SEC on February 27, 2017 (the “2016 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 loan losses and the status of contingencies, and are subject to change. (d) Merger with Astoria Financial Corporation On October 2, 2017 , the Company completed its merger with Astoria Financial Corporation (“Astoria”). Astoria merged with and into the Company. The Company was the accounting acquirer and the surviving entity. Astoria Bank, the principal subsidiary of Astoria, merged into the Bank. We refer to these transactions as the “Astoria Merger”. As the Astoria Merger was completed on October 2, 2017 , Astoria’s balances or results of operations are not included in this Quarterly Report on Form 10-Q. See Note 20. “Merger with Astoria Financial Corporation”. (e) Adoption of New Accounting Standard Effective January 1, 2017, the Company adopted the provisions of Accounting Standard Update (“ASU”) 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” This standard requires that all income tax effects related to settlements of stock-based compensation awards be reported in earnings as an increase or decrease to income tax expense. The adoption of this standard reduced reported income tax expense by $64 in the third quarter of 2017, and $806 in the nine months ended September 30, 2017. The Company also elected to recognize forfeitures of stock-based compensation awards as they occur, which did not have a material impact to the consolidated financial statements.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions Restaurant Franchise Financing Loan Portfolio On September 9, 2016 , the Bank acquired a restaurant franchise financing loan portfolio from GE Capital with an unpaid principal balance of $169,760 . Total cash paid for the portfolio was $163,282 , which included a discount to the balance of gross loans receivable of 4.00% , or $6,790 , plus accrued interest receivable. As the acquired assets did not constitute a business, the transaction was accounted for as an asset purchase. These loans are classified as traditional commercial and industrial loans in our financial statements. See Note 4. “Portfolio Loans” for additional information. NSBC Acquisition On March 31, 2016 , the Bank acquired 100% of the outstanding equity interests of NSBC (the “NSBC Acquisition”). NSBC is a provider of asset-based lending solutions to middle market commercial clients. NSBC’s loans had a fair value of $320,447 on the acquisition date and consisted of 100% floating-rate assets. The Bank paid a premium on the balance of gross loans receivable acquired of 5.90% , or $18,906 . The Bank assumed $4,839 of liabilities, which consisted mainly of cash collateral on loans outstanding. The Bank recognized a customer list intangible asset of $1,500 that is being amortized over its 24 -month estimated life and $25,698 of goodwill. The Bank recorded a $1,500 restructuring charge in the first quarter of 2016 consisting mainly of retention and severance compensation, IT contract terminations and professional fees.

Securities

Securities	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Securities	Securities A summary of amortized cost and estimated fair value of securities as of September 30, 2017 and December 31, 2016 is presented below. The term “MBS” refers to mortgage-backed securities and the term “CMOs” refers to collateralized mortgage obligations. Both of these terms are further defined in Note 17. “Fair Value Measurements”. September 30, 2017 Available for Sale Held to Maturity Amortized cost Gross unrealized gains Gross unrealized losses Fair value Amortized cost Gross unrecognized gains Gross unrecognized losses Fair value Residential MBS: Agency-backed $ 1,879,874 $ 3,392 $ (13,299 ) $ 1,869,967 $ 273,727 $ 1,767 $ (1,820 ) $ 273,674 CMOs/Other MBS 66,863 39 (851 ) 66,051 35,223 55 (466 ) 34,812 Total residential MBS 1,946,737 3,431 (14,150 ) 1,936,018 308,950 1,822 (2,286 ) 308,486 Other securities: Federal agencies 233,097 — (7,340 ) 225,757 58,531 1,557 — 60,088 Corporate 119,211 1,523 (690 ) 120,044 35,000 966 — 35,966 State and municipal 296,799 1,994 (1,536 ) 297,257 1,518,343 8,751 (14,754 ) 1,512,340 Other — — — — 15,750 125 — 15,875 Total other securities 649,107 3,517 (9,566 ) 643,058 1,627,624 11,399 (14,754 ) 1,624,269 Total securities $ 2,595,844 $ 6,948 $ (23,716 ) $ 2,579,076 $ 1,936,574 $ 13,221 $ (17,040 ) $ 1,932,755 December 31, 2016 Available for Sale Held to Maturity Amortized cost Gross unrealized gains Gross unrealized losses Fair value Amortized cost Gross unrecognized gains Gross unrecognized losses Fair value Residential MBS: Agency-backed $ 1,213,733 $ 569 $ (20,821 ) $ 1,193,481 $ 277,539 $ 1,353 $ (3,625 ) $ 275,267 CMOs/Other MBS 57,563 44 (926 ) 56,681 40,594 74 (572 ) 40,096 Total residential MBS 1,271,296 613 (21,747 ) 1,250,162 318,133 1,427 (4,197 ) 315,363 Other securities: Federal agencies 204,770 2 (10,793 ) 193,979 58,200 1,392 — 59,592 Corporate 43,464 150 (1,108 ) 42,506 35,048 431 (11 ) 35,468 State and municipal 245,304 739 (5,273 ) 240,770 974,290 3,571 (36,232 ) 941,629 Other — — — — 5,750 195 — 5,945 Total other securities 493,538 891 (17,174 ) 477,255 1,073,288 5,589 (36,243 ) 1,042,634 Total securities $ 1,764,834 $ 1,504 $ (38,921 ) $ 1,727,417 $ 1,391,421 $ 7,016 $ (40,440 ) $ 1,357,997 The amortized cost and estimated fair value of securities at September 30, 2017 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. September 30, 2017 Available for sale Held to maturity Amortized cost Fair value Amortized cost Fair value Remaining period to contractual maturity: One year or less $ 15,768 $ 15,798 $ 58,985 $ 59,078 One to five years 150,116 150,284 74,591 76,114 Five to ten years 314,574 310,946 248,328 252,765 Greater than ten years 168,649 166,030 1,245,720 1,236,312 Total securities with a stated maturity date 649,107 643,058 1,627,624 1,624,269 Residential MBS 1,946,737 1,936,018 308,950 308,486 Total securities $ 2,595,844 $ 2,579,076 $ 1,936,574 $ 1,932,755 Sales of securities for the periods indicated below were as follows: For the three months ended For the nine months ended September 30, September 30, 2017 2016 2017 2016 Available for sale: Proceeds from sales $ 5,015 $ 300,047 $ 15,247 $ 858,531 Gross realized gains 1 4,272 7 10,667 Gross realized losses (22 ) (839 ) (281 ) (3,043 ) Income tax (benefit) expense on realized net (losses) gains (7 ) 1,141 (89 ) 2,535 At September 30, 2017 and December 31, 2016 , 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 securities available for sale with unrealized losses, segregated by the length of time in a continuous unrealized loss position for the periods presented below: Continuous unrealized loss position Less than 12 months 12 months or longer Total Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses Available for sale September 30, 2017 Residential MBS: Agency-backed $ 1,102,564 $ (7,583 ) $ 195,399 $ (5,716 ) $ 1,297,963 $ (13,299 ) CMOs/Other MBS 38,979 (298 ) 20,935 (553 ) 59,914 (851 ) Total residential MBS 1,141,543 (7,881 ) 216,334 (6,269 ) 1,357,877 (14,150 ) Other securities: Federal agencies 96,258 (1,443 ) 129,498 (5,897 ) 225,756 (7,340 ) Corporate 47,691 (115 ) 15,288 (575 ) 62,979 (690 ) State and municipal 43,670 (177 ) 58,042 (1,359 ) 101,712 (1,536 ) Total other securities 187,619 (1,735 ) 202,828 (7,831 ) 390,447 (9,566 ) Total $ 1,329,162 $ (9,616 ) $ 419,162 $ (14,100 ) $ 1,748,324 $ (23,716 ) December 31, 2016 Residential MBS: Agency-backed $ 1,101,641 $ (20,816 ) $ 686 $ (5 ) $ 1,102,327 $ (20,821 ) CMOs/Other MBS 38,841 (506 ) 15,239 (420 ) 54,080 (926 ) Total residential MBS 1,140,482 (21,322 ) 15,925 (425 ) 1,156,407 (21,747 ) Other securities: Federal agencies 185,504 (10,793 ) 4 — 185,508 (10,793 ) Corporate 10,399 (137 ) 14,942 (971 ) 25,341 (1,108 ) State and municipal 173,062 (5,196 ) 3,733 (77 ) 176,795 (5,273 ) Total other securities 368,965 (16,126 ) 18,679 (1,048 ) 387,644 (17,174 ) Total securities $ 1,509,447 $ (37,448 ) $ 34,604 $ (1,473 ) $ 1,544,051 $ (38,921 ) The following table summarizes securities held to maturity 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 value Unrecognized losses Fair value Unrecognized losses Fair value Unrecognized losses Held to maturity September 30, 2017 Residential MBS: Agency-backed $ 118,898 $ (1,428 ) $ 11,570 $ (392 ) $ 130,468 $ (1,820 ) CMOs/Other MBS 18,704 (209 ) 11,740 (257 ) 30,444 (466 ) Total residential MBS 137,602 (1,637 ) 23,310 (649 ) 160,912 (2,286 ) Other securities: State and municipal 594,870 (5,005 ) 415,640 (9,749 ) 1,010,510 (14,754 ) Total other securities 594,870 (5,005 ) 415,640 (9,749 ) 1,010,510 (14,754 ) Total $ 732,472 $ (6,642 ) $ 438,950 $ (10,398 ) $ 1,171,422 $ (17,040 ) December 31, 2016 Residential MBS: Agency-backed $ 185,116 $ (3,623 ) $ 213 $ (2 ) $ 185,329 $ (3,625 ) CMOs/Other MBS 34,786 (572 ) — — 34,786 (572 ) Total residential MBS 219,902 (4,195 ) 213 (2 ) 220,115 (4,197 ) Other securities: Corporate — — 5,037 (11 ) 5,037 (11 ) State and municipal 758,690 (36,169 ) 2,816 (63 ) 761,506 (36,232 ) Total other securities 758,690 (36,169 ) 7,853 (74 ) 766,543 (36,243 ) Total securities $ 978,592 $ (40,364 ) $ 8,066 $ (76 ) $ 986,658 $ (40,440 ) At September 30, 2017 , a total of 198 available for sale securities were in a continuous unrealized loss position for less than 12 months and 93 available for sale securities were in a continuous unrealized loss position for 12 months or longer. Declines in the fair value of held to maturity and available for sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses to the extent the impairment is related to credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income. In estimating other than temporary impairment (“OTTI”) losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost; (ii) the financial condition and near-term prospects of the issuer; and (iii) the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in cost. Management has the ability and intent to hold the securities classified as held to maturity in the table above until they mature, at which time the Company anticipates it will receive full value for the securities. Furthermore, as of September 30, 2017 , management did not have the intent to sell any of the securities classified as available for sale in the table above and believes that it is more likely than not that the Company will not have to sell any such securities before a recovery of cost. Any unrealized losses are largely due to increases in market interest rates over the yields available at the time the underlying securities were purchased. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Management does not believe any of the securities are impaired due to reasons related to credit quality. As of September 30, 2017 , management believes the impairments detailed in the table above are temporary. 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: September 30, December 31, 2017 2016 Available for sale securities pledged for borrowings, at fair value $ 898,414 $ 67,599 Available for sale securities pledged for municipal deposits, at fair value 318,428 398,961 Available for sale securities pledged for customer back-to-back swaps, at fair value — 126 Held to maturity securities pledged for borrowings, at amortized cost 195,340 55,343 Held to maturity securities pledged for municipal deposits, at amortized cost 1,359,827 958,246 Total securities pledged $ 2,772,009 $ 1,480,275

Portfolio Loans

Portfolio Loans	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Portfolio Loans	Portfolio Loans The composition of the Company’s loan portfolio, excluding loans held for sale, was the following for the periods presented below: September 30, December 31, 2017 2016 Commercial: Commercial and industrial (“C&I”): Traditional C&I $ 1,726,018 $ 1,404,774 Asset-based lending 794,632 741,942 Payroll finance 251,003 255,549 Warehouse lending 669,860 616,946 Factored receivables 236,051 214,242 Equipment financing 679,127 589,315 Public sector finance 484,973 349,182 Total C&I 4,841,664 4,171,950 Commercial mortgage: Commercial real estate 3,453,151 3,162,942 Multi-family 1,020,094 981,076 Acquisition, development & construction (“ADC”) 236,456 230,086 Total commercial mortgage 4,709,701 4,374,104 Total commercial 9,551,365 8,546,054 Residential mortgage 684,093 697,108 Consumer 258,077 284,068 Total portfolio loans 10,493,535 9,527,230 Allowance for loan losses (72,128 ) (63,622 ) Total portfolio loans, net $ 10,421,407 $ 9,463,608 Total portfolio loans include net deferred loan origination fees of $3,742 and $1,788 at September 30, 2017 and December 31, 2016 , respectively. At September 30, 2017 and December 31, 2016 , the Company pledged residential mortgage and commercial real estate loans of $2,607,655 and $2,050,982 , respectively, to the FHLB as collateral for certain borrowing arrangements. See Note 8. “Borrowings”. The following tables set forth the amounts and status of the Company’s loans, troubled debt restructurings (“TDRs”) and non-performing loans at September 30, 2017 and December 31, 2016 : September 30, 2017 Current 30-59 days past due 60-89 days past due 90+ days past due Non- accrual Total Traditional C&I $ 1,695,373 $ 2,694 $ 2,312 $ 230 $ 25,409 $ 1,726,018 Asset-based lending 794,632 — — — — 794,632 Payroll finance 250,999 — — — 4 251,003 Warehouse lending 669,860 — — — — 669,860 Factored receivables 236,051 — — — — 236,051 Equipment financing 670,455 4,400 432 — 3,840 679,127 Public sector finance 484,973 — — — — 484,973 Commercial real estate 3,426,670 4,352 1,177 78 20,874 3,453,151 Multi-family 1,020,039 — — — 55 1,020,094 ADC 234,628 — — — 1,828 236,456 Residential mortgage 671,083 1,956 978 84 9,992 684,093 Consumer 247,829 2,202 988 — 7,058 258,077 Total portfolio loans $ 10,402,592 $ 15,604 $ 5,887 $ 392 $ 69,060 $ 10,493,535 Total TDRs included above $ 16,212 $ 1,879 $ 527 $ — $ 27,967 $ 46,585 Non-performing loans: Loans 90+ days past due and still accruing $ 392 Non-accrual loans 69,060 Total non-performing loans $ 69,452 December 31, 2016 Current 30-59 days past due 60-89 days past due 90+ days past due Non- accrual Total Traditional C&I $ 1,376,181 $ 835 $ 817 $ 555 $ 26,386 $ 1,404,774 Asset-based lending 741,942 — — — — 741,942 Payroll finance 254,715 — 14 621 199 255,549 Warehouse lending 616,946 — — — — 616,946 Factored receivables 213,624 — — — 618 214,242 Equipment financing 583,835 2,142 1,092 — 2,246 589,315 Public sector finance 349,182 — — — — 349,182 Commercial real estate 3,140,561 967 — 406 21,008 3,162,942 Multi-family 981,005 — — — 71 981,076 ADC 224,817 — — — 5,269 230,086 Residential mortgage 675,750 5,509 951 108 14,790 697,108 Consumer 274,719 2,423 350 — 6,576 284,068 Total portfolio loans $ 9,433,277 $ 11,876 $ 3,224 $ 1,690 $ 77,163 $ 9,527,230 Total TDRs included above $ 11,032 $ 253 $ — $ — $ 1,989 $ 13,274 Non-performing loans: Loans 90+ days past due and still accruing $ 1,690 Non-accrual loans 77,163 Total non-performing loans $ 78,853 The following table provides additional analysis of the Company’s non-accrual loans at September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 Recorded investment non-accrual loans Recorded investment PCI (1) non-accrual loans Recorded investment total non-accrual loans Unpaid principal balance non-accrual loans Recorded investment non-accrual loans Recorded investment PCI (1) non-accrual loans Recorded investment total non-accrual loans Unpaid principal balance non-accrual loans Traditional C&I $ 21,386 $ 4,023 $ 25,409 $ 25,752 $ 22,338 $ 4,048 $ 26,386 $ 26,386 Payroll finance 4 — 4 — 199 — 199 199 Factored receivables — — — — 618 — 618 618 Equipment financing — — 3,840 3,840 2,246 — 2,246 2,246 Commercial real estate 17,657 3,217 20,874 25,290 15,063 5,945 21,008 25,619 Multi-family 55 — 55 63 71 — 71 71 ADC 1,828 — 1,828 2,024 5,269 — 5,269 5,398 Residential mortgage 9,636 356 9,992 12,619 13,399 1,391 14,790 18,190 Consumer 6,337 721 7,058 8,649 5,719 857 6,576 7,865 Total $ 56,903 $ 8,317 $ 69,060 $ 78,237 $ 64,922 $ 12,241 $ 77,163 $ 86,592 (1) The Company acquired loans for which there was, at acquisition, both evidence of deterioration of credit quality since origination and the probability, at acquisition, that all contractually required payments would not be collected. These loans are classified as purchased credit impaired loans (“PCI loans”). There were no non-accrual asset-based lending, warehouse lending or public sector finance loans at September 30, 2017 or December 31, 2016 . When the ultimate collectibility of the total principal of an impaired 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 collectibility of the total principal of an impaired 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 September 30, 2017 and December 31, 2016 , the recorded investment of residential mortgage loans that was in the process of foreclosure was $6,780 and $9,263 , respectively, which is included in non-accrual residential mortgage loans above. The following table sets forth loans evaluated for impairment by segment and the allowance evaluated by segment at September 30, 2017 : Loans evaluated by segment Allowance evaluated by segment Individually evaluated for impairment Collectively evaluated for impairment PCI loans Total loans Individually evaluated for impairment Collectively evaluated for impairment Total allowance for loan losses Traditional C&I $ 24,509 $ 1,689,063 $ 12,446 $ 1,726,018 $ — $ 17,200 $ 17,200 Asset-based lending — 792,382 2,250 794,632 — 4,776 4,776 Payroll finance — 251,003 — 251,003 — 2,191 2,191 Warehouse lending — 669,860 — 669,860 — 3,734 3,734 Factored receivables — 236,051 — 236,051 — 1,273 1,273 Equipment financing 5,789 673,338 — 679,127 — 4,461 4,461 Public sector finance — 484,973 — 484,973 — 1,352 1,352 Commercial real estate 14,719 3,400,311 38,121 3,453,151 — 23,203 23,203 Multi-family — 1,015,858 4,236 1,020,094 — 4,054 4,054 ADC 5,584 230,611 261 236,456 — 1,314 1,314 Residential mortgage 1,605 681,389 1,099 684,093 — 5,054 5,054 Consumer 3,216 253,421 1,440 258,077 — 3,516 3,516 Total portfolio loans $ 55,422 $ 10,378,260 $ 59,853 $ 10,493,535 $ — $ 72,128 $ 72,128 The following table sets forth loans evaluated for impairment by segment and the allowance evaluated by segment at December 31, 2016 : Loans evaluated by segment Allowance evaluated by segment Individually evaluated for impairment Collectively evaluated for impairment PCI loans Total loans Individually evaluated for impairment Collectively evaluated for impairment Total allowance for loan losses Traditional C&I $ 25,221 $ 1,365,466 $ 14,087 $ 1,404,774 $ — $ 12,864 $ 12,864 Asset-based lending — 724,247 17,695 741,942 — 3,316 3,316 Payroll finance 570 254,979 — 255,549 — 951 951 Warehouse lending — 616,946 — 616,946 — 1,563 1,563 Factored receivables — 214,242 — 214,242 — 1,669 1,669 Equipment financing 1,413 587,902 — 589,315 — 5,039 5,039 Public sector finance — 349,182 — 349,182 — 1,062 1,062 Commercial real estate 14,853 3,104,057 44,032 3,162,942 — 20,466 20,466 Multi-family — 976,710 4,366 981,076 — 4,991 4,991 ADC 9,025 216,094 4,967 230,086 — 1,931 1,931 Residential mortgage 2,545 692,396 2,167 697,108 — 5,864 5,864 Consumer 1,764 280,710 1,594 284,068 — 3,906 3,906 Total portfolio loans $ 55,391 $ 9,382,931 $ 88,908 $ 9,527,230 $ — $ 63,622 $ 63,622 Management considers a loan to be impaired when, based on current information and events, it is determined that the Company will not be able to collect all amounts due according to the loan contract, including scheduled interest payments. Evaluation of impairment is generally treated the same across all classes of loans on a loan-by-loan basis, except residential mortgage loans and consumer loans, which include home equity lines of credit (“HELOC”) with an outstanding balance of $500 or less, which are generally evaluated for impairment on a homogeneous pool basis. When management identifies a loan as impaired, the impairment is measured based on the present value of expected future cash flows, discounted at the loan’s effective interest rate, except when the sole remaining source of repayment of the loan is the operation or liquidation of the collateral. In these cases, management uses the current fair value of the collateral, less selling costs when foreclosure or liquidation is probable, instead of discounted cash flows. If management determines that the value of the impaired loan is less than the recorded investment in the loan (net of previous charge-offs, deferred loan fees or costs and unamortized premium or discount), impairment is generally recognized through a charge-off to the allowance for loan losses. The carrying amount of PCI loans is presented in the tables above. At September 30, 2017 , the net recorded amount of PCI loans was $59,853 , which included $2,250 of asset-based lending loans acquired in the NSBC Acquisition. There was $775 and $685 of specific impairments included in the balance of accretable yield associated with PCI loans at September 30, 2017 and December 31, 2016 , respectively. The following table presents the changes in the balance of the accretable yield discount for PCI loans for the three and nine months ended September 30, 2017 and 2016 : For the three months ended September 30, For the nine months ended September 30, 2017 2016 2017 2016 Balance at beginning of period $ 10,877 $ 11,307 $ 11,117 $ 11,211 Balances acquired in the NSBC Acquisition — — — 2,200 Accretion of income (2,412 ) (1,168 ) (4,612 ) (3,447 ) Reclassification from non-accretable difference 1,412 1,398 3,372 1,573 Balance at end of period $ 9,877 $ 11,537 $ 9,877 $ 11,537 Income is not recognized on PCI loans unless the Company can reasonably estimate the cash flows that are expected to be collected over the life of the loan. The balance of PCI loans that were treated under the cost recovery method was $8,317 and $12,241 at September 30, 2017 and December 31, 2016 , respectively. The following table presents loans individually evaluated for impairment, excluding PCI loans, by segment of loans at September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 Unpaid principal balance Recorded investment Unpaid principal balance Recorded investment Loans with no related allowance recorded: Traditional C&I $ 24,886 $ 24,509 $ 25,221 $ 25,221 Payroll finance — — 570 570 Equipment financing 5,789 5,789 1,413 1,413 Commercial real estate 16,488 14,719 16,365 14,853 ADC 5,850 5,584 9,025 9,025 Residential mortgage 1,943 1,605 2,545 2,545 Consumer 3,216 3,216 1,764 1,764 Total $ 58,172 $ 55,422 $ 56,903 $ 55,391 At September 30, 2017 and December 31, 2016 , there were no asset-based lending, warehouse lending, factored receivables, public sector finance or multi-family loans that were individually evaluated for impairment. The Company’s policy generally requires a charge-off of the difference between the present value of the cash flows or the net collateral value of the collateral securing the loan and the Company’s recorded investment. As a result, there were no impaired loans with an allowance recorded at September 30, 2017 or December 31, 2016 . The following table presents the average recorded investment and interest income recognized related to loans individually evaluated for impairment by segment for the three months ended September 30, 2017 and September 30, 2016 : For the three months ended September 30, 2017 September 30, 2016 QTD average recorded investment Interest income recognized Cash-basis interest income recognized QTD average recorded investment Interest income recognized Cash-basis interest income recognized Loans with no related allowance recorded: Traditional C&I $ 24,653 $ 8 $ — $ 27,173 $ 30 $ — Factored receivables — — — 247 — — Equipment financing 5,469 — — 2,028 — — Commercial real estate 13,258 95 — 16,414 64 — ADC 5,611 48 — 8,434 63 — Residential mortgage 1,060 — — 515 — — Consumer 2,356 — — 1,895 — — Total $ 52,407 $ 151 $ — $ 56,706 $ 157 $ — There were no impaired loans with an allowance recorded at September 30, 2017 or December 31, 2016 . For the three months and nine months ended September 30, 2017 and 2016 , there were no asset-based lending, payroll finance, warehouse lending, public sector finance or multi-family loans that were impaired and there was no cash-basis interest income recognized. The following table presents the average recorded investment and interest income recognized related to loans individually evaluated for impairment by segment for the nine months ended September 30, 2017 and September 30, 2016 : For the nine months ended September 30, 2017 September 30, 2016 YTD average recorded investment Interest income recognized Cash-basis interest income recognized YTD average recorded investment Interest income recognized Cash-basis interest income recognized Loans with no related allowance recorded: Traditional C&I $ 24,747 $ 22 $ — $ 22,370 $ 45 $ — Factored receivables — — — 82 — — Equipment financing 3,429 — — 1,259 — — Commercial real estate 10,410 271 — 13,516 135 — ADC 5,562 154 — 8,346 178 — Residential mortgage 787 — — 515 — — Consumer 1,927 — — 1,380 — — Total $ 46,862 $ 447 $ — $ 47,468 $ 358 $ — There were no asset-based lending, payroll finance, warehouse lending, public sector finance, or multi-family loans that were impaired. Troubled Debt Restructuring (“TDRs”) The following tables set forth the amounts and past due status of the Company’s TDRs at September 30, 2017 and December 31, 2016 : September 30, 2017 Current loans 30-59 days past due 60-89 days past due 90+ days past due Non- accrual Total Traditional C&I $ 567 $ — $ — $ — $ 23,188 $ 23,755 Equipment financing 961 1,879 — — — 2,840 Commercial real estate 2,940 — — — 118 3,058 ADC 4,189 — — — 1,828 6,017 Residential mortgage 5,379 — 336 — 2,648 8,363 Consumer 2,176 — 191 — 185 2,552 Total $ 16,212 $ 1,879 $ 527 $ — $ 27,967 $ 46,585 December 31, 2016 Current loans 30-59 days past due 60-89 days past due 90+ days past due Non- accrual Total Traditional C&I $ 572 $ — $ — $ — $ 128 $ 700 Equipment financing — — — — 29 29 Commercial real estate 2,443 253 — — — 2,696 ADC 5,962 — — — 458 6,420 Residential mortgage 2,055 — — — 1,374 3,429 Total $ 11,032 $ 253 $ — $ — $ 1,989 $ 13,274 There were no asset-based lending, payroll finance, warehouse lending, factored receivables, public sector finance, or multi-family loans that were TDRs for either period presented above. At December 31, 2016, there also were no consumer loans that were TDRs. The Company did not have outstanding commitments to lend additional amounts to customers with loans classified as TDRs as of September 30, 2017 or December 31, 2016 . There were eight loans modified as a TDR in the nine months ended September 30, 2017 . These TDRs did not increase the allowance for loan losses and did not result in charge-offs in the nine months ended September 30, 2017 . The following table presents loans by segment modified as TDRs that occurred during the first nine months of 2017 and 2016 : September 30, 2017 September 30, 2016 Recorded investment Recorded investment Number Pre- modification Post- modification Number Pre- modification Post- modification Traditional C&I 1 $ 23,188 $ 23,188 — $ — $ — Equipment financing 2 3,088 3,088 — — — Commercial real estate 2 1,724 1,724 — — — ADC 1 797 797 — — — Residential mortgage 2 552 551 1 469 469 Total TDRs 8 $ 29,349 $ 29,348 1 $ 469 $ 469 There were no asset-based lending, payroll finance, warehouse lending, factored receivables, public sector finance, multi-family or consumer loans modified as TDRs during the first nine months of 2017 and 2016 . There were no TDRs that were modified during the nine months ended September 30, 2017 or 2016 that subsequently defaulted (which is defined as missing three consecutive monthly payments or being over 90 days past due on a scheduled payment). The traditional C&I loan that was designated as a TDR is a taxi medallion loan that was on non-accrual prior to its restructuring.

Allowance for Loan Losses

Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Allowance for Loan Losses	Allowance for Loan Losses Activity in the allowance for loan losses for the three and nine months ended September 30, 2017 and 2016 is summarized below: For the three months ended September 30, 2017 Beginning balance Charge-offs Recoveries Net charge-offs Provision / (reversal of) Ending balance Traditional C&I $ 15,506 $ (68 ) $ 316 $ 248 $ 1,446 $ 17,200 Asset-based lending 2,582 — 1 1 2,192 4,775 Payroll finance 1,287 (188 ) 1 (187 ) 1,091 2,191 Warehouse lending 2,435 — — — 1,299 3,734 Factored receivables 1,151 (564 ) 5 (559 ) 679 1,271 Equipment financing 5,735 (741 ) 45 (696 ) (577 ) 4,462 Public sector finance 1,887 — — — (535 ) 1,352 Commercial real estate 25,181 (1,345 ) 17 (1,328 ) (648 ) 23,205 Multi-family 5,028 — — — (974 ) 4,054 ADC 920 (5 ) — (5 ) 399 1,314 Residential mortgage 5,124 (389 ) — (389 ) 319 5,054 Consumer 3,315 (156 ) 48 (108 ) 309 3,516 Total allowance for loan losses $ 70,151 $ (3,456 ) $ 433 $ (3,023 ) $ 5,000 $ 72,128 Annualized net charge-offs to average loans outstanding: 0.12 % For the three months ended September 30, 2016 Beginning balance Charge-offs Recoveries Net charge-offs Provision / (reversal of) Ending balance Traditional C&I $ 11,057 $ (570 ) $ 381 $ (189 ) $ 434 $ 11,302 Asset-based lending 3,280 — — — 193 3,473 Payroll finance 1,165 — — — 145 1,310 Warehouse lending 652 — — — 829 1,481 Factored receivables 1,585 (60 ) 10 (50 ) 511 2,046 Equipment financing 5,346 (377 ) 123 (254 ) 108 5,200 Public sector finance 894 — — — 216 1,110 Commercial real estate 17,523 (630 ) 111 (519 ) 2,073 19,077 Multi-family 3,463 (399 ) — (399 ) 657 3,721 ADC 2,042 — — — (298 ) 1,744 Residential mortgage 4,875 (338 ) — (338 ) 347 4,884 Consumer 3,983 (259 ) 48 (211 ) 285 4,057 Total allowance for loan losses $ 55,865 $ (2,633 ) $ 673 $ (1,960 ) $ 5,500 $ 59,405 Annualized net charge-offs to average loans outstanding: 0.09 % For the nine months ended September 30, 2017 Beginning Charge-offs Recoveries Net Provision/ (reversal of) Ending balance Traditional C&I $ 12,864 $ (919 ) $ 978 $ 59 $ 4,277 $ 17,200 Asset-based lending 3,316 — 5 5 1,454 4,775 Payroll finance 951 (188 ) 1 (187 ) 1,427 2,191 Warehouse lending 1,563 — — — 2,171 3,734 Factored receivables 1,669 (871 ) 23 (848 ) 450 1,271 Equipment financing 5,039 (1,822 ) 331 (1,491 ) 914 4,462 Public sector finance 1,062 — — — 290 1,352 Commercial real estate 20,466 (2,372 ) 117 (2,255 ) 4,994 23,205 Multi-family 4,991 — — — (937 ) 4,054 ADC 1,931 (27 ) 269 242 (859 ) 1,314 Residential mortgage 5,864 (668 ) 159 (509 ) (301 ) 5,054 Consumer 3,906 (687 ) 177 (510 ) 120 3,516 Total allowance for loan losses $ 63,622 $ (7,554 ) $ 2,060 $ (5,494 ) $ 14,000 $ 72,128 Annualized net charge-offs to average loans outstanding: 0.08 % For the nine months ended September 30, 2016 Beginning Charge-offs Recoveries Net Provision/ (reversal of) Ending balance Traditional C&I $ 9,922 $ (1,488 ) $ 847 $ (641 ) $ 2,021 $ 11,302 Asset-based lending 2,793 — 62 62 618 3,473 Payroll finance 1,936 (28 ) 32 4 (630 ) 1,310 Warehouse lending 589 — — — 892 1,481 Factored receivables 1,457 (933 ) 51 (882 ) 1,471 2,046 Equipment financing 4,925 (1,406 ) 333 (1,073 ) 1,348 5,200 Public sector finance 547 — — — 563 1,110 Commercial real estate 13,861 (734 ) 185 (549 ) 5,765 19,077 Multi-family 2,741 (417 ) 2 (415 ) 1,395 3,721 ADC 2,009 — 104 104 (369 ) 1,744 Residential mortgage 5,007 (771 ) 29 (742 ) 619 4,884 Consumer 4,358 (1,302 ) 194 (1,108 ) 807 4,057 Total allowance for loan losses $ 50,145 $ (7,079 ) $ 1,839 $ (5,240 ) $ 14,500 $ 59,405 Annualized net charge-offs to average loans outstanding: 0.08 % Credit Quality Indicators As part of the ongoing monitoring of the credit quality of the Company’s 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 HELOC and other consumer loans; (iv) net charge-offs; (v) non-performing loans (see details above); and (vi) the general economic conditions in the greater New York metropolitan region. The Company analyzes 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 $500 . This analysis is performed at least quarterly on all criticized/classified loans. The Company uses 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 and 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 September 30, 2017 and December 31, 2016 , the risk category of gross loans by segment was as follows: September 30, 2017 December 31, 2016 Special mention Substandard Doubtful Special mention Substandard Doubtful Traditional C&I $ 10,717 $ 44,307 $ 794 $ 12,125 $ 28,977 $ 442 Asset-based lending 40,312 — — 35,373 — — Payroll finance 14,703 1,976 — — 820 — Factored receivables 270 — — 185 433 — Equipment financing 10,703 5,204 — 2,128 3,397 — Commercial real estate 35,105 28,970 — 39,190 29,463 — Multi-family — 634 — 7,072 658 — ADC 4,204 4,948 — 6,899 8,870 — Residential mortgage 978 10,958 — 951 15,796 — Consumer 992 7,208 1 646 6,738 — Total $ 117,984 $ 104,205 $ 795 $ 104,569 $ 95,152 $ 442 There were no criticized or classified warehouse lending or public sector finance loans for the periods presented. There were no loans rated “loss” at September 30, 2017 or December 31, 2016 .

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2017
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: September 30, December 31, 2017 2016 Goodwill $ 696,600 $ 696,600 Other intangible assets: Core deposits $ 32,515 $ 37,455 Customer lists 6,312 7,683 Non-compete agreements 354 625 Trade name 20,500 20,500 Fair value of below market leases 9 90 Total $ 59,690 $ 66,353 The decrease in other intangible assets at September 30, 2017 compared to December 31, 2016 was due to amortization of intangibles. The estimated aggregate future amortization expense for intangible assets remaining as of September 30, 2017 was as follows: Amortization expense Remainder of 2017 $ 2,175 2018 7,285 2019 6,074 2020 5,428 2021 5,022 2022 4,522 Thereafter 8,684 Total $ 39,190

Deposits

Deposits	9 Months Ended
	Sep. 30, 2017
Deposits [Abstract]
Deposits	Deposits Deposit balances at September 30, 2017 and December 31, 2016 were as follows: September 30, December 31, 2017 2016 Non-interest bearing demand $ 3,134,359 $ 3,239,332 Interest bearing demand 2,397,172 2,220,456 Savings 807,845 747,031 Money market 4,137,702 3,277,686 Certificates of deposit 566,360 583,754 Total deposits $ 11,043,438 $ 10,068,259 Total municipal deposits were $1,751,012 and $1,270,921 at September 30, 2017 and December 31, 2016 , respectively. See Note 3. “Securities” for the aggregate amount of securities that were pledged as collateral for municipal deposits and other purposes. Brokered deposits at September 30, 2017 and December 31, 2016 were as follows: September 30, December 31, 2017 2016 Interest bearing demand $ 24,518 $ 426,437 Savings — 5,560 Money market 499,413 246,572 Money market - reciprocal brokered deposits 142,094 153,060 CDARs 1 and ICS 2 one way 259,106 — Total brokered deposits $ 925,131 $ 831,629 1 CDARs are deposits generated through the certificate of deposit account registry service. 2 ICS are deposits generated through the insured cash sweep program.

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2017
Debt Instruments [Abstract]
Borrowings	Borrowings The Company’s borrowings and weighted average interest rates were as follows for the periods presented: September 30, December 31, 2017 2016 Amount Rate Amount Rate By type of borrowing: FHLB borrowings $ 3,016,000 1.40 % $ 1,791,000 1.01 % Repurchase agreements 28,403 0.74 16,642 0.75 Federal funds purchased 160,000 1.31 — — Senior Notes 76,719 5.98 76,469 5.98 Subordinated Notes 172,661 5.45 172,501 5.45 Total borrowings $ 3,453,783 1.70 % $ 2,056,612 1.56 % By remaining period to maturity: Less than one year $ 2,621,122 1.46 % $ 1,397,642 0.87 % One to two years 410,000 1.59 311,469 2.53 Two to three years 200,000 1.78 75,000 1.50 Three to four years 50,000 1.68 50,000 1.38 Four to five years — — 50,000 1.68 Greater than five years 172,661 5.45 172,501 5.45 Total borrowings $ 3,453,783 1.70 % $ 2,056,612 1.56 % 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 September 30, 2017 and December 31, 2016 , the Bank had total residential mortgage and commercial real estate loans pledged after discount of $2,607,655 and $2,050,982 , respectively. In addition to the pledged mortgages, the Bank had also pledged securities to secure borrowings, which are disclosed in Note 3. “Securities.” As of September 30, 2017 , the Bank had unused borrowing capacity at the FHLB of $1,053,356 and may increase its borrowing capacity by pledging securities not required to be pledged for other purposes with a collateral value of approximately $1,379,691 . Repurchase agreements. The Bank enters into sales of securities under agreements to repurchase. These repurchase agreements facilitate the needs of our customers and a portion of our secured short-term funding needs. Securities sold under agreements to repurchase at September 30, 2017 and December 31, 2016 are secured short-term borrowings that mature in one to 45 days and are generally renewed on a continuous basis. Repurchase agreements are stated at the amount of cash received in connection with these transactions. The securities pledged under these repurchase agreements fluctuate in value due to market conditions. The Bank is obligated to promptly transfer additional securities if the market value of the securities falls below the repurchase agreement price. Securities pledged as collateral under repurchase agreements are maintained with our safekeeping agents. Federal funds purchased. The Bank maintains federal funds purchase lines with several financial institutions. Federal funds purchased are short-term borrowings that typically mature overnight. Federal funds purchased totaled $160,000 and $0 at September 30, 2017 and December 31, 2016 , respectively. Senior Notes. On July 2, 2013 , the Company issued $100,000 principal amount of 5.50% fixed rate senior notes (the “Senior Notes”) through a private placement at a discount of 1.75% . The cost of issuance was $303 , and at September 30, 2017 and December 31, 2016 the unamortized discount was $281 and $531 , respectively, which will be accreted to interest expense over the life of the Senior Notes, resulting in an effective yield of 5.98% . Interest is due semi-annually in arrears on January 2 and July 2 until maturity on July 2, 2018 . During September 2016, the Company redeemed $23,000 of the Senior Notes. Subordinated Notes . On March 29, 2016 , the Bank issued $110,000 principal amount of 5.25% fixed-to-floating rate subordinated notes (the “Subordinated Notes”) through a private placement at a discount of 1.25% . The cost of issuance was $500 . On September 2, 2016, the Bank reopened the Subordinated Notes offering and issued an additional $65,000 principal amount of Subordinated Notes. The Subordinated Notes issued September 2, 2016 are fully fungible with, rank equally in right of payment with, and form a single series with the Subordinated Notes issued in March 2016. The Subordinated Notes issued September 2016 were issued to the purchasers at a premium of 0.50% and an underwriters discount of 1.25% . The cost of issuance was $275 . At September 30, 2017 , the net unamortized discount of all Subordinated Notes was $2,339 , which will be accreted to interest expense over the life of the Subordinated Notes, resulting in an effective yield of 5.45% . Interest is due semi-annually in arrears on April 1 and October 1 of each year, until April 1, 2021 . From and including April 1, 2021 , the Subordinated Notes will bear interest at a floating rate per annum equal to three-month LIBOR plus 3.937% , payable quarterly on January 1 , April 1 , July 1 and October 1 of each year, beginning on July 1, 2021 , through maturity on April 1, 2026 or earlier redemption. The Subordinated Notes are also redeemable by the Bank, in whole or in part, on April 1, 2021 and each interest payment date thereafter. The Subordinated Notes are redeemable in whole at any time upon the occurrence of certain specified events. The Subordinated Notes are unsecured, subordinated obligations of the Bank and are subordinated in right of payment to all of the Bank’s existing and future senior indebtedness, including claims of depositors and general creditors. The Subordinated Notes qualify as Tier 2 capital for regulatory purposes. See Note 15. “Stockholders’ Equity” for additional information. Revolving line of credit. Effective September 5, 2017 , the Company renewed and increased to $35,000 its revolving line of credit facility (the “Credit Facility”). The Credit Facility, which is with another financial institution, matures on September 4, 2018 . The balance was zero at September 30, 2017 and December 31, 2016 . The use of proceeds are for general corporate purposes. The Credit Facility and accrued interest is payable at maturity, and the Company is required to maintain a zero balance for at least 30 days during its term. Loans under the Credit Facility bear interest at one-month LIBOR plus 1.25% . Under the terms of the Credit Facility, the Company and the Bank must maintain certain ratios related to capital, non-performing assets to capital, reserves to non-performing loans and debt service coverage. The Company and the Bank were in compliance with all requirements of the Credit Facility at September 30, 2017 .

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedges, Assets [Abstract]
Derivatives	Derivatives The Company has entered into certain interest rate swap contracts that are not designated as hedging instruments. These derivative contracts relate to transactions in which the Company enters into an interest rate swap with a customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each swap transaction, the Company agrees to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, the Company agrees to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows the Company’s customers to effectively convert a variable rate loan to a fixed rate loan. Because the Company acts as an intermediary for its customers, changes in the fair value of the underlying derivative contracts largely offset each other and do not materially impact results of operations. The Company has entered into interest rate swap contracts that are both over-the-counter, or OTC, and those that are exchanged on futures markets such as the Chicago Mercantile Exchange, or the CME. At September 30, 2017 and December 31, 2016 , the OTC derivatives are included in the financial statements at the gross fair value amount of the asset (included in other assets) and liability (included in other liabilities), which represents the change in the fair value of the contract since inception. Effective for the quarter ended March 31, 2017, the CME amended its rulebook to legally characterize 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, or STM. As a result of this change, at September 30, 2017 the Company paid cash as STM in the amount of $2,059 for the net fair value of its CME interest rate swap contracts with another financial institution. The variation margin payment changes daily, positively or negatively, based on a change in the fair value of the underlying interest rate swap contracts. The Company does not typically require its commercial customers to post cash or securities as collateral on its program of back-to-back swaps. However, certain language is written into the International Swaps and Derivatives Association agreement and loan documents where, in default situations, the Company is allowed to access collateral supporting the loan relationship to recover any losses suffered on the derivative asset or liability. Summary information as of September 30, 2017 and December 31, 2016 regarding these derivatives is presented below: Notional amount Average maturity (in years) Weighted average fixed rate Weighted average variable rate Fair value September 30, 2017 Included in other assets: Third-party interest rate swap $ 154,798 $ 442 Customer interest rate swap 352,213 4,341 Total $ 507,011 5.98 4.21 % 1 m Libor +2.28% $ 4,783 Included in other liabilities: Third-party interest rate swap (352,213 ) $ (2,918 ) Customer interest rate swap (154,798 ) (3,924 ) Total $ (507,011 ) 5.98 4.21 % 1 m Libor +2.28% $ (6,842 ) December 31, 2016 3rd party interest rate swap $ 296,282 5.63 3.94 % 1 m Libor + 2.29% $ 2,088 Customer interest rate swap (296,282 ) 5.63 3.94 1 m Libor + 2.29% (2,088 ) The Company enters into various commitments to sell real estate loans into the secondary market. Such commitments are considered to be derivative financial instruments; however, the fair value of these commitments is not material.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
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 For the nine months ended September 30, September 30, 2017 2016 2017 2016 Income before income tax expense $ 66,444 $ 54,413 $ 185,939 $ 146,604 Tax at Federal statutory rate of 35% 23,253 19,045 65,076 51,312 State and local income taxes, net of Federal tax benefit 2,531 2,938 7,302 7,923 Tax exempt interest, net of disallowed interest (5,213 ) (3,942 ) (12,487 ) (7,734 ) Bank owned life insurance income (462 ) (643 ) (1,484 ) (1,518 ) Non-deductible acquisition related costs 237 — 1,193 — Low income housing tax credits (139 ) (118 ) (416 ) (352 ) Stock-based compensation benefit (1) (1 ) — (807 ) — Other, net 1,386 (289 ) 1,243 (1,985 ) Actual income tax expense $ 21,592 $ 16,991 $ 59,620 $ 47,646 Effective income tax rate 32.5 % 31.2 % 32.1 % 32.5 % (1 ) See Note 1. “Basis of Financial Statement Presentation - Adoption of New Accounting Standard” for additional information. Net deferred tax assets totaled $33,569 at September 30, 2017 and $40,548 at December 31, 2016 . No valuation allowance was recorded against deferred tax assets as of those dates, as management believes it is more likely than not that all of the deferred tax assets will be realized because they were supported by recoverable taxes paid in prior years. There were no unrecognized tax benefits during any of the reported periods. Interest and/or penalties related to income taxes are reported as a component of other non-interest expense. Such amounts were not material during the reported periods. The Company is generally no longer subject to examination by Federal, state and local taxing authorities for fiscal years prior to September 30, 2013.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company has active stock-based compensation plans, as described below. The Company’s stockholders approved the 2015 Omnibus Equity and Incentive Plan (the “2015 Plan”) on May 28, 2015. The 2015 Plan permits the grant of stock options, stock appreciation rights, restricted stock (both time-based and performance-based), restricted stock units, deferred stock and other stock-based awards. The total number of shares that may be awarded under the 2015 Plan is 2,800,000 shares plus the remaining shares available for grant under the stockholder approved 2014 Stock Incentive Plan (the “2014 Plan”) as of the date of adoption of the 2015 Plan. At September 30, 2017 , there were, in aggregate, 3,146,510 shares available for future grant under the 2015 Plan. The Company’s stockholders approved the 2014 Plan on February 20, 2014. The approval of the 2015 Plan resulted in the termination of the 2014 Plan. Awards granted under the 2014 Plan that were outstanding as of May 28, 2015 will continue to be governed by the 2014 Plan document; however, no future grants will be made under the 2014 Plan. Under the 2015 Plan, one share is deducted from the 2015 Plan for every share or share underlying the equity award that is awarded and delivered under the 2015 Plan. Restricted stock awards are granted with a fair value equal to the market price of the Company’s common stock at the date of grant. Stock option awards are granted with a strike price that is equal to the market price of the Company’s common stock at the date of grant. The restricted stock awards generally vest in equal installments annually on the anniversary date and have total vesting periods ranging from one to five years, while stock options have 10 -year contractual terms. In connection with the merger of the Company and Legacy Sterling Bancorp (“Legacy Sterling”) in 2013, the Company granted 104,152 options at an exercise price of $14.25 per share pursuant to a Registration Statement on Form S-8 under which the Company assumed all outstanding fully-vested Legacy Sterling stock options. All options were exercised or expired on March 15, 2017 . The Company also granted 95,991 shares under the Legacy Sterling Bancorp 2013 Employment Inducement Award Plan to certain executive officers of Legacy Sterling. In addition, the Company issued 255,973 shares of restricted stock from shares available under a prior plan to certain executives of Legacy Sterling. The weighted average grant date fair value under both of these plans was $11.72 per share, and the restricted stock awards vested in October 2016. The following table summarizes the activity in the Company’s active stock-based compensation plans for the nine months ended September 30, 2017 : 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, 2017 3,639,838 932,223 $ 14.09 1,004,119 $ 11.00 Granted (556,534 ) 556,534 24.07 — — Stock awards vested — (155,498 ) 14.28 — — Exercised — — — (118,598 ) 10.06 Forfeited 68,113 (66,113 ) 18.84 (2,000 ) 13.18 Canceled/expired (4,907 ) — — — 13.18 Balance at September 30, 2017 3,146,510 1,267,146 $ 19.61 883,521 $ 11.12 Exercisable at September 30, 2017 776,767 $ 10.81 The total intrinsic value of outstanding in-the-money stock options and outstanding in-the-money exercisable stock options was $ 11,956 and $10,748 , respectively, at September 30, 2017 . The Company uses an option pricing model to estimate the grant date fair value of stock options granted. There were no stock options granted during the nine months ended September 30, 2017 or September 30, 2016 . Stock-based compensation expense is recognized ratably over the requisite service period for all awards. Stock-based compensation expense associated with stock options and non-vested stock awards and the related income tax benefit are presented below: For the three months ended For the nine months ended September 30, September 30, 2017 2016 2017 2016 Stock options $ 48 $ 95 $ 146 $ 345 Non-vested stock awards/performance units 1,921 1,579 5,456 4,615 Total $ 1,969 $ 1,674 $ 5,602 $ 4,960 Income tax benefit 640 557 1,821 1,652 Proceeds from stock option exercises 65 2,278 1,193 3,703 Unrecognized stock-based compensation expense as of September 30, 2017 was as follows: September 30, 2017 Stock options $ 12 Non-vested stock awards/performance units 14,894 Total $ 14,906 The weighted average period over which unrecognized stock options expense is expected to be recognized is 0.11 years . The weighted average period over which unrecognized non-vested stock awards/performance units expense is expected to be recognized is 1.70 years .

Other Post-Retirement Plans

Other Post-Retirement Plans	9 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
Other Post-Retirement Plans	Other Post-Retirement Plans Total other post-retirement expense is comprised of the following for the periods presented below: For the three months ended For the nine months ended September 30, September 30, 2017 2016 2017 2016 Service cost $ — $ — $ — $ — Interest cost 101 104 302 313 Net amortization and deferral 8 16 26 48 Total other post-retirement expense $ 109 $ 120 $ 328 $ 361 Total other post-retirement expense is included as a component of compensation and benefits expense in the consolidated income statements. The Company’s other post-retirement plans include non-qualified Supplemental Executive Retirement Plans (“SERPs”) that provide certain directors, officers and executives with supplemental retirement benefits. The Company contributed $109 and $77 to fund SERP benefits during the nine months ended September 30, 2017 and 2016 , respectively. Total post-retirement plan liabilities were $12,344 and $12,125 at September 30, 2017 and December 31, 2016 , respectively, and are included in other liabilities in the consolidated balance sheets.

Other Non-Interest Expense

Other Non-Interest Expense	9 Months Ended
	Sep. 30, 2017
Other Income and Expenses [Abstract]
Other Non-interest Expense	Other Non-interest Expense Other non-interest expense items for the three and nine months ended September 30, 2017 and 2016 , respectively, are presented in the following table: For the three months ended For the nine months ended September 30, September 30, 2017 2016 2017 2016 Other non-interest expense: Advertising and promotion $ 649 $ 737 $ 2,034 $ 2,273 Professional fees 2,234 2,604 6,917 7,684 Data and check processing 2,512 2,402 7,402 6,417 Insurance & surety bond premium 841 821 2,065 2,503 Other 3,917 4,371 12,735 14,453 Total other non-interest expense $ 10,153 $ 10,935 $ 31,153 $ 33,330

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share The following is a summary of the calculation of earnings per share (“EPS”): For the three months ended For the nine months ended September 30, September 30, 2017 2016 2017 2016 Net income $ 44,852 $ 37,422 $ 126,319 $ 98,958 Weighted average common shares outstanding for computation of basic EPS 135,346,791 130,239,193 135,276,634 130,049,358 Common-equivalent shares due to the dilutive effect of stock options and unvested performance share grants (1) 603,369 636,421 618,879 596,347 Weighted average common shares for computation of diluted EPS 135,950,160 130,875,614 135,895,513 130,645,705 Earnings per common share: Basic $ 0.33 $ 0.29 $ 0.93 $ 0.76 Diluted 0.33 0.29 0.93 0.76 Weighted average common shares that could be exercised that were anti-dilutive for the period (2) — — — — (1) Represents incremental shares computed using the treasury stock method. (2) Anti-dilutive shares are not included in determining diluted earnings per share. There were no anti-dilutive shares in the three and nine months ended September 30, 2017 or September 30, 2016 .

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2017
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 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 Basel III Capital Rules became effective for the Company and the Bank on January 1, 2015 (subject to a phase-in period for certain provisions). Quantitative measures established by the Basel III Capital Rules to ensure capital adequacy require the maintenance of minimum amounts and ratios (set forth in the table below) of Common Equity Tier 1 capital (as defined in the regulations), Tier 1 capital (as defined in the regulations) and Total capital (as defined in the regulations) to risk-weighted assets (as defined in the regulations, “RWA”), and of Tier 1 capital to adjusted quarterly average assets (as defined in the regulations, the “Tier 1 leverage ratio”). 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 the Company includes a permissible portion of the allowance for loan losses and $172,661 and $156,699 of the Subordinated Notes, respectively. 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 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. The Tier 1 leverage ratio is calculated by dividing Tier 1 capital by adjusted quarterly average total assets, which excludes goodwill and other intangible assets, among other items. When fully phased-in on January 1, 2019, the Basel III Capital Rules will require the Company and the Bank to maintain: (i) a minimum ratio of Common Equity Tier 1 capital to RWA of at least 4.5%, plus a 2.5% “capital conservation buffer” (which is added to the 4.5% Common Equity Tier 1 capital ratio as that buffer is phased in, effectively resulting in a minimum ratio of Common Equity Tier 1 capital to RWA of at least 7.0% upon full implementation); (ii) a minimum ratio of Tier 1 capital to RWA of at least 6.0%, plus the capital conservation buffer (which is added to the 6.0% Tier 1 capital ratio as that buffer is phased in, effectively resulting in a minimum Tier 1 capital ratio of 8.5% upon full implementation); (iii) a minimum ratio of Total capital (that is, Tier 1 plus Tier 2) to RWA of at least 8.0%, plus the capital conservation buffer (which is added to the 8.0% total capital ratio as that buffer is phased in, effectively resulting in a minimum total capital ratio of 10.5% upon full implementation); and (iv) a minimum Tier 1 leverage ratio of 4.0%. The implementation of the capital conservation buffer began on January 1, 2016 at the 0.625% level and effective January 1, 2017, increased to the 1.25% level and will be phased-in over a four-year period (increasing by 0.625% on each subsequent January 1, until it reaches 2.5% on January 1, 2019). The Basel III Capital Rules also provide for a “countercyclical capital buffer” that is applicable to only certain covered institutions and does not have any current applicability to the Company or the Bank. The aforementioned capital conservation buffer is designed to absorb losses during periods of economic stress. Banking institutions with a ratio of Common Equity Tier 1 capital to RWA above the minimum but below the conservation buffer (or below the combined capital conservation buffer and countercyclical capital buffer, when the latter is applied) will face constraints on dividends, equity repurchases and compensation based on the amount of the shortfall. The following tables present actual and required capital ratios as of September 30, 2017 and December 31, 2016 for the Company and the Bank under the Basel III Capital Rules. The minimum required capital amounts presented include the minimum required capital levels as of September 30, 2017 and December 31, 2016 based on the phase-in provisions of the Basel III Capital Rules and the minimum required capital levels as of January 1, 2019 when the Basel III Capital Rules have been fully phased-in. 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 phase-in schedule Minimum capital required - Basel III fully phased-in Required to be considered well- capitalized Capital amount Ratio Capital amount Ratio Capital amount Ratio Capital amount Ratio September 30, 2017 Common equity tier 1 to RWA: Sterling National Bank $ 1,276,461 10.41 % $ 704,960 5.75 % $ 858,212 7.00 % $ 796,911 6.50 % Sterling Bancorp 1,259,416 10.27 704,787 5.75 858,002 7.00 N/A N/A Tier 1 capital to RWA: Sterling National Bank 1,276,461 10.41 % 888,862 7.25 % 1,042,114 8.50 % 980,813 8.00 % Sterling Bancorp 1,259,416 10.27 888,645 7.25 1,041,859 8.50 N/A N/A Total capital to RWA: Sterling National Bank 1,521,795 12.41 % 1,134,065 9.25 % 1,287,317 10.50 % 1,226,017 10.00 % Sterling Bancorp 1,488,787 12.15 1,133,788 9.25 1,287,002 10.50 N/A N/A Tier 1 leverage ratio: Sterling National Bank 1,276,461 8.54 597,687 4.00 % 597,687 4.00 % 747,109 5.00 % Sterling Bancorp 1,259,416 8.42 598,037 4.00 598,037 4.00 N/A N/A Actual Minimum capital required - Basel III phase-in schedule Minimum capital required - Basel III fully phased-in Required to be considered well- capitalized Capital amount Ratio Capital amount Ratio Capital amount Ratio Capital amount Ratio December 31, 2016 Common equity tier 1 to RWA: Sterling National Bank $ 1,176,497 10.87 % $ 554,663 5.125 % $ 757,588 7.00 % $ 703,475 6.50 % Sterling Bancorp 1,160,739 10.73 554,474 5.125 757,330 7.00 N/A N/A Tier 1 capital to RWA: Sterling National Bank 1,176,497 10.87 % 717,003 6.625 % 919,928 8.50 % 865,815 8.00 % Sterling Bancorp 1,160,739 10.73 716,759 6.625 919,615 8.50 N/A N/A Total capital to RWA: Sterling National Bank 1,413,165 13.06 % 933,457 8.625 % 1,136,382 10.50 % 1,082,269 10.00 % Sterling Bancorp 1,377,547 12.73 933,139 8.625 1,135,995 10.50 N/A N/A Tier 1 leverage ratio: Sterling National Bank 1,176,497 9.08 % 518,308 4.000 % 518,308 4.00 % 647,885 5.00 % Sterling Bancorp 1,160,739 8.95 518,733 4.000 518,733 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 September 30, 2017 , management believes that the Bank and the Company meet all capital adequacy requirements to which they are subject. (b) Dividend Restrictions The Company is mainly dependent on dividends from the Bank to provide funds for the payment of dividends to stockholders and to provide for other cash requirements. Banking regulations may limit the amount of dividends that may be paid. Approval by regulatory authorities is required if the effect of dividends declared would cause the regulatory capital of the Bank to fall below specified minimum levels. Approval is also required if dividends declared exceed the net profits for that fiscal year combined with the retained net profits for the preceding two fiscal years. Under the foregoing dividend restrictions and while maintaining its “well-capitalized” status, at September 30, 2017 , the Bank had capacity to pay aggregate dividends of up to $221,000 to the Company without prior regulatory approval. (c) Capital Raise On November 22, 2016 , the Company completed a public offering of 4,370,000 shares of common stock at an offering price of $20.95 per share for gross proceeds of approximately $92,863 , and net proceeds, after underwriting discounts, commissions and other costs of issuance, of $90,995 . (d) Stock Repurchase Plans From time to time, the Company’s Board of Directors has authorized stock repurchase plans. The Company has 776,713 shares that are available to be purchased under a previously announced stock repurchase program. There were no shares repurchased under the repurchase program during the nine months ended September 30, 2017 or September 30, 2016 . (e) Liquidation Rights Upon completion of a second-step conversion in January 2004 , the Bank established a special “liquidation account” in accordance with Office of the Comptroller of the Currency regulations. The account was established for the benefit of Eligible Account Holders and Supplemental Eligible Account Holders (as defined in the plan of conversion) in an amount equal to the greater of (i) the Mutual Holding Company’s (as defined in the plan of conversion) ownership interest in the retained earnings of the Bank as of the date of its latest balance sheet contained in the prospectus; or (ii) the retained earnings of the Bank at the time that the Bank reorganized into the Mutual Holding Company in 1999. Each Eligible Account Holder and Supplemental Eligible Account Holder that continues to maintain his or her deposit account at the Bank would be entitled, in the event of a complete liquidation of the Bank, to a pro rata interest in the liquidation account prior to any payment to the stockholders of the Company. The liquidation account is reduced annually on September 30 to the extent that Eligible Account Holders and Supplemental Eligible Account Holders have reduced their qualifying deposits as of each anniversary date. At September 30, 2017 , the liquidation account had a balance of $13,300 . Subsequent increases in deposits do not restore such account holder’s interest in the liquidation account. The Bank may not pay cash dividends or make other capital distributions if the effect thereof would reduce its stockholders’ equity below the amount of the liquidation account.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies (a) Off-Balance Sheet Financial Instruments In the normal course of business, the Company enters into various transactions, which, in accordance with GAAP, are not included in its consolidated balance sheet. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company minimizes its exposure to losses under these commitments by subjecting them to credit approval and monitoring procedures. The Company enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Substantially all of the Company’s commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of loan funding. Standby letters of credit are written conditional commitments issued by the Company to guarantee the performance of a customer to a third-party. In the event the customer does not perform in accordance with the terms of the agreement with the third-party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. If the commitment were funded, the Company would be entitled to seek recovery from the customer. Based on the Company’s credit risk exposure assessment of its standby letter of credit arrangements, the arrangements contain security and debt covenants similar to those contained in loan agreements. The contractual or notional amounts of these instruments, which reflect the extent of the Company’s involvement in particular classes of off-balance sheet financial instruments, are summarized as follows: September 30, December 31, 2017 2016 Loan origination commitments $ 252,197 $ 245,319 Unused lines of credit 1,025,171 968,288 Letters of credit 131,611 114,582 (b) Lease Commitments The Company leases certain premises and equipment under operating leases with terms expiring through January 2034. Included in occupancy and office operations expense was net rent expense of $1,874 and $2,394 during the three months ended September 30, 2017 and 2016 , respectively, and net rent expense of $6,263 and $8,115 during the nine months ended September 30, 2017 and 2016 , respectively. Future minimum lease payments due under non-cancelable operating leases at September 30, 2017 were as follows: Remainder of 2017 $ 2,478 2018 9,616 2019 8,513 2020 7,607 2021 6,168 2022 5,039 2023 and thereafter 15,716 $ 55,137 (c) Litigation The Company and the Bank are involved in a number of judicial proceedings concerning matters arising from their business activities. These include routine legal proceedings arising in the ordinary course of business. These proceedings also include actions brought against the Company and the Bank with respect to corporate matters and transactions in which the Company and the Bank are or were involved; in particular, the Company has been named as a defendant in shareholder litigation arising out of the announcement of the Astoria Merger. While the Company believes these claims are without merit, the Company has agreed to settle the litigations related to the Astoria Merger, pending court approval, and believes these settlement amounts will be immaterial. In addition, the Company and the Bank may be requested to provide information or otherwise cooperate with government authorities in the conduct of investigations of other persons or industry groups. There can be no assurance as to the ultimate outcome of a legal proceeding; however, the Company and the Bank have generally denied liability in all significant litigation pending against them and intend to defend vigorously each case, other than matters that are determined appropriate to be settled. The Company 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.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
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 the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are 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 the Company’s creditworthiness, among other items, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. The Company’s 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 the Company’s 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; 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 usually coincide with the Company’s monthly and/or quarterly valuation process. Investment Securities Available for Sale The majority of the Company’s available for sale investment securities are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains 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. The Company reviews 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, the Company does not purchase investment securities that have a complicated structure. The Company’s 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, the Company validates, 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 September 30, 2017 , management does not believe any of our securities are OTTI; however, management reviews all of the Company’s securities on at least a quarterly basis to assess whether impairment, if any, is OTTI. Derivatives The fair values of derivatives are based on valuation models using current market terms (including interest rates and fees), the remaining terms of the agreements, and the creditworthiness of the counterparty as of the measurement date (Level 2 inputs). The Company’s derivatives consist of interest rate swaps. See Note 9. “Derivatives” for additional information. A summary of such investment securities available for sale and derivatives at September 30, 2017 and December 31, 2016 , respectively, were measured at estimated fair value on a recurring basis, is as follows: September 30, 2017 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Assets: Investment securities available for sale: Residential MBS (1) : Agency-backed $ 1,869,967 $ — $ 1,869,967 $ — CMOs (2) /Other MBS 66,051 — 66,051 — Total residential MBS 1,936,018 — 1,936,018 — Other securities: Federal agencies 225,757 — 225,757 — Corporate 120,044 — 120,044 — State and municipal 297,257 297,257 — Total other securities 643,058 — 643,058 — Total available for sale securities 2,579,076 — 2,579,076 — Swaps 4,783 — 4,783 — Total assets $ 2,583,859 $ — $ 2,583,859 $ — Liabilities: Swaps $ (6,842 ) $ — $ (6,842 ) $ — Total liabilities $ (6,842 ) $ — $ (6,842 ) $ — (1) Residential MBS are debt securities whose cash flows come from residential mortgage and consumer loans, such as mortgages and HELOCs. A residential MBS is comprised of a pool of mortgage loans created by financial institutions, including governmental agencies. The cash flows from each of the mortgage loans included in the pool are structured through a special purpose entity into various classes and tranches, which then issue securities backed by those cash flows to investors. (2) CMOs are debt securities that are collateralized by a specific pool of residential mortgage loans, in which the issuer of the CMOs can direct the payments of principal and interest received on the underlying collateral to achieve specific investor cash flow objectives. The Bank generally acquires planned-amortization class securities and CMOs with a sequential pay structure in order to manage the duration and extension risk inherent in these securities. December 31, 2016 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Assets: Investment securities available for sale: Residential MBS: Agency-backed $ 1,193,481 $ — $ 1,193,481 $ — CMOs/Other MBS 56,681 — 56,681 — Total residential MBS 1,250,162 — 1,250,162 — Federal agencies 193,979 — 193,979 — Corporate bonds 42,506 — 42,506 — State and municipal 240,770 240,770 — Total other securities 477,255 — 477,255 — Total available for sale securities 1,727,417 — 1,727,417 — Swaps 2,088 — 2,088 — Total assets $ 1,729,505 $ — $ 1,729,505 $ — Liabilities: Swaps $ (2,088 ) $ — $ (2,088 ) $ — Total liabilities $ (2,088 ) $ — $ (2,088 ) $ — 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. Impaired Loans Loans that meet certain criteria are evaluated individually for impairment. Generally, commercial loans less than $250 and residential mortgage and consumer loans, including HELOCs, less than $500 are evaluated for impairment on a pooled basis. Impairment amounts are generally based on the fair value of the underlying collateral supporting the loan and, as a result, the carrying value of the loan less the calculated impairment amount applicable to that loan does not necessarily represent the fair value of the loan. Real estate collateral is valued using independent appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable by market participants. However, due to the substantial judgment applied and limited volume of activity as compared to other assets, fair value of the underlying collateral is based on Level 3 inputs. Estimates of fair value used for collateral supporting commercial loans generally are based on assumptions not observable in the market place and are also based on Level 3 inputs. Impaired loans are remeasured at least quarterly and their carrying values are adjusted as needed. Impaired loans subject to non-recurring fair value measurements were $55,422 and $55,391 at September 30, 2017 and December 31, 2016 , respectively. Changes in fair value recognized as a charge-off on loans held by the Company were $542 and $314 for the nine months ended September 30, 2017 and 2016 , respectively. When an impaired loan is collateral dependent, the Company charges-off the difference between the recorded investment in the loan and the appraised value less cost to sell. A discount for estimated costs to dispose of the asset and overall marketability is used when estimating the amount of impairment. A summary of the classes with impaired loans at September 30, 2017 and December 31, 2016 , respectively, is set forth below: September 30, 2017 Fair value Level 1 inputs Level 2 inputs Level 3 inputs C&I $ 177 $ — $ — $ 177 Commercial real estate 3,278 — — 3,278 Residential mortgage 921 — — 921 Total impaired loans measured at fair value $ 4,376 $ — $ — $ 4,376 December 31, 2016 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Commercial real estate $ 6,786 $ — $ — $ 6,786 Total impaired loans measured at fair value $ 6,786 $ — $ — $ 6,786 Mortgage Servicing Rights Mortgage servicing rights are carried at the lower of cost or estimated fair value. The fair value of mortgage servicing rights is estimated using a discounted cash flow model that is prepared by an independent third-party valuation provider and is performed on a quarterly basis. The significant assumptions, which are assumptions we believe other market participants would use, include the following: market discount rates, prepayment speeds, servicing revenue, the cost of servicing and loan default rates. The market discount rates and prepayment speeds are considered by management to be two of the most significant inputs into the determination of the estimated fair value. Due to the significant judgment involved, the determination of estimated fair value of mortgage servicing rights relies upon Level 3 inputs. At September 30, 2017 , the assumption for prepayment speeds ranged from 100 to 432 with a weighted average prepayment speed of 187 and the assumption for market discount rate ranged from 9.25% to 12.25% with a weighted average market discount rate of 10.57% . At December 31, 2016 , the assumption for prepayment speeds ranged from 100 to 555 with a weighted average prepayment speed of 174 and the assumption for market discount rate ranged from 8.50% to 11.50% with a weighted average market discount rate of 9.73% . The fair value of mortgage servicing rights at September 30, 2017 and December 31, 2016 was $999 and $1,024 , respectively. Other Real Estate Owned Other real estate owned is initially recorded at fair value less costs to sell when acquired, which establishes a new cost basis. When an asset is acquired, the excess of the recorded investment in the loan over the fair value less cost to sell is charged to the allowance for loan losses. These assets are subsequently accounted for at the lower of cost or fair value less costs to sell and are primarily comprised of commercial and residential real estate property. If the fair value declines, a write-down is recorded in other real estate owned expense, net on the income statement. Fair value is generally determined using appraisals or other indications of value based on comparable sales of similar properties or assumptions generally observable in the marketplace. Adjustments are routinely made in the appraisal process by independent appraisers for differences between comparable sales and income data available (in the case of income producing properties). The fair value is derived using Level 3 inputs. Appraisals are reviewed by the Company’s credit department and an external loan review consultant and verified by officers in the Company’s credit administration area. At September 30, 2017 and December 31, 2016 , appraisals were discounted by 22.0% , which considers estimated costs to sell and overall marketability of the properties. Other real estate owned subject to non-recurring fair value measurement were $11,697 and $13,619 at September 30, 2017 and December 31, 2016 , respectively. There were $1,737 and $582 of write-downs related to changes in fair value for other real estate owned held by the Company during the nine months ended September 30, 2017 and September 30, 2016 , respectively. Fair Value of Financial Instruments Fair values for financial instruments must be estimated by management using techniques such as discounted cash flow analysis and comparison to similar instruments. These estimates are highly subjective and require judgments regarding significant matters, such as the amount and timing of future cash flows and the selection of discount rates that appropriately reflect market and credit risks. Changes in these judgments often have a material effect on the fair value estimates. Since these estimates are made as of a specific point in time, they are susceptible to material near-term changes. Fair values disclosed in accordance with FASB ASC Topic 825 do not reflect any premium or discount that could result from the sale of a large volume of a particular financial instrument, nor do they reflect possible tax ramifications or estimated transaction costs. 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 September 30, 2017 : September 30, 2017 Carrying amount Level 1 inputs Level 2 inputs Level 3 inputs Financial assets: Cash and cash equivalents $ 407,203 $ 407,203 $ — $ — Securities available for sale 2,579,076 — 2,579,076 — Securities held to maturity 1,936,574 — 1,932,755 — Portfolio loans, net 10,421,407 — — 10,369,659 Accrued interest receivable on securities 26,283 — 26,283 — Accrued interest receivable on loans 31,278 — — 31,278 FHLB stock and FRB stock 191,276 — — — Swaps 4,783 — 4,783 — Financial liabilities: Non-maturity deposits (10,477,078 ) (10,477,078 ) — — Certificates of deposit (566,360 ) — (564,517 ) — FHLB borrowings (3,016,000 ) — (3,043,454 ) — Other borrowings (188,403 ) — (188,402 ) — Senior Notes (76,719 ) — (78,987 ) — Subordinated Notes (172,661 ) — (183,589 ) — Mortgage escrow funds (19,148 ) — (19,148 ) — Accrued interest payable on deposits (812 ) — (812 ) — Accrued interest payable on borrowings (9,949 ) — (9,949 ) — Swaps (6,842 ) — (6,842 ) — 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, 2016 : December 31, 2016 Carrying amount Level 1 inputs Level 2 inputs Level 3 inputs Financial assets: Cash and cash equivalents $ 293,646 $ 293,646 $ — $ — Securities available for sale 1,727,417 — 1,727,417 — Securities held to maturity 1,391,421 — 1,357,997 — Loans held for sale 41,889 — 41,889 — Portfolio loans, net 9,463,608 — — 9,461,469 Accrued interest receivable on securities 16,495 — 16,495 — Accrued interest receivable on loans 26,824 — — 26,824 FHLB stock and FRB stock 135,098 — — — Swaps 2,088 — 2,088 — Financial liabilities: Non-maturity deposits (9,484,505 ) (9,484,505 ) — — Certificates of deposit (583,754 ) — (582,811 ) — FHLB borrowings (1,791,000 ) — (1,788,676 ) — Other borrowings (16,642 ) — (16,642 ) — Senior Notes (76,469 ) — (79,283 ) — Subordinated Notes (172,501 ) — (169,813 ) — Mortgage escrow funds (13,572 ) — (13,572 ) — Accrued interest payable on deposits (663 ) — (663 ) — Accrued interest payable on borrowings (3,621 ) — (3,621 ) — Swaps (2,088 ) — (2,088 ) — The following paragraphs summarize the principal methods and assumptions used by the Company to estimate the fair value of the Company’s financial instruments: Loans The estimated fair value approximates the carrying value for variable-rate loans that reprice frequently with no significant change in credit risk. The fair value of fixed-rate loans and variable-rate loans which reprice on an infrequent basis is estimated by discounting future cash flows using the current interest rates at which similar loans with similar terms would be made to borrowers of similar credit quality. An overall valuation adjustment is made for specific credit risks, as well as general portfolio credit risk. FHLB Stock and FRB Stock The redeemable carrying amount of these securities with limited marketability approximates their fair value. Deposits and Mortgage Escrow Funds Deposits with no stated maturity (such as demand, money market and savings deposits) are assigned fair values equal to the carrying amounts payable on demand. Certificates of deposit and mortgage escrow funds are segregated by account type and original term, and fair values are estimated by discounting the contractual cash flows. The discount rate for each account grouping is equivalent to the current market rates for deposits of similar type and maturity. These fair values do not include the value of core deposit relationships that comprise a significant portion of the Company’s deposits. We believe that the Company’s core deposit relationships provide a relatively stable, low-cost funding source that has a substantial value separate from the deposit balances. FHLB Borrowings, Other Borrowings, Senior Notes and Subordinated Notes The estimated fair value approximates the carrying value for short-term borrowings. The fair value of long-term fixed-rate borrowings is estimated using quoted market prices, if available, or by discounting future cash flows using current interest rates for similar financial instruments. Accrued Interest Receivable/Payable The carrying amounts of accrued interest approximate fair value and are classified in accordance with the related instrument. Other Financial Instruments Other financial assets and liabilities listed in the tables above have estimated fair values that approximate their respective carrying amounts because the instruments are payable on demand or have short-term maturities and present relatively low credit risk and interest rate risk. The fair values of the Company’s off-balance sheet financial instruments described in the “Off-Balance Sheet Financial Instruments” section of Note 16. “Commitments and Contingencies” were estimated based on current market terms (including interest rates and fees), considering the remaining terms of the agreements and the creditworthiness of the counterparties. At September 30, 2017 and December 31, 2016 , the estimated fair value of these instruments approximated the related carrying amounts, which were not material.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Components of accumulated other comprehensive income (loss) (“AOCI”) were as follows as of the dates shown below: September 30, December 31, 2017 2016 Net unrealized holding loss on available for sale securities $ (16,768 ) $ (37,417 ) Related income tax benefit 6,623 14,780 Available for sale securities AOCI, net of tax (10,145 ) (22,637 ) Net unrealized holding loss on securities transferred to held to maturity (4,670 ) (5,395 ) Related income tax benefit 1,845 2,131 Securities transferred to held to maturity AOCI, net of tax (2,825 ) (3,264 ) Net unrealized holding loss on retirement plans (1,139 ) (1,213 ) Related income tax benefit 450 479 Retirement plans AOCI, net of tax (689 ) (734 ) AOCI $ (13,659 ) $ (26,635 ) The following table presents the changes in each component of AOCI for the three and nine months ended September 30, 2017 and 2016 : Net unrealized holding gain (loss) on available for sale securities Net unrealized holding gain (loss) on securities transferred to held to maturity Net unrealized holding (loss) gain on retirement plans Total For the three months ended September 30, 2017 Balance beginning of the period $ (12,704 ) $ (2,969 ) $ (695 ) $ (16,368 ) Other comprehensive gain before reclassification 2,538 — — 2,538 Amounts reclassified from AOCI 21 144 6 171 Total other comprehensive income 2,559 144 6 2,709 Balance at end of period $ (10,145 ) $ (2,825 ) $ (689 ) $ (13,659 ) For the three months ended September 30, 2016 Balance beginning of the period $ 15,391 $ (3,731 ) $ (730 ) $ 10,930 Other comprehensive (loss) before reclassification (1,278 ) — — (1,278 ) Amounts reclassified from AOCI (2,076 ) 328 (11 ) (1,759 ) Total other comprehensive (loss) income (3,354 ) 328 (11 ) (3,037 ) Balance at end of period $ 12,037 $ (3,403 ) $ (741 ) $ 7,893 Location in income statement where reclassification from AOCI is included Net (loss) gain on sale of securities Interest income on securities Compensation and benefits expense Net unrealized holding (loss) gain on available for sale securities Net unrealized holding (loss)gain on securities transferred to held to maturity Net unrealized holding (loss) gain on retirement plans Total For the nine months ended September 30, 2017 Balance beginning of the period $ (22,637 ) $ (3,264 ) $ (734 ) $ (26,635 ) Other comprehensive gain before reclassification 12,218 — — 12,218 Amounts reclassified from AOCI 274 439 45 758 Total other comprehensive income 12,492 439 45 12,976 Balance at end of period $ (10,145 ) $ (2,825 ) $ (689 ) $ (13,659 ) For the nine months ended September 30, 2016 Balance beginning of the period $ (6,999 ) $ (4,155 ) $ (970 ) $ (12,124 ) Other comprehensive gain before reclassification 23,649 — — 23,649 Amounts reclassified from AOCI (4,613 ) 752 229 (3,632 ) Total other comprehensive income 19,036 752 229 20,017 Balance at end of period $ 12,037 $ (3,403 ) $ (741 ) $ 7,893 Location in income statement where reclassification from AOCI is included Net (loss) gain on sale of securities Interest income on securities Compensation and benefits expense

Recently Issued Accounting Stan

Recently Issued Accounting Standards Not Yet Adopted	9 Months Ended
	Sep. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Standards Not Yet Adopted	Recently Issued Accounting Standards Not Yet Adopted ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” ASU 2014-09 implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. This standard is effective for the Company on January 1, 2018. Our revenue is comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and non-interest income, which is subject to ASU 2014-09. We expect that ASU 2014-09 may require the Company to change how it recognizes certain recurring revenue streams within accounts receivable management and factoring commissions and other categories of non-interest income; however, we do not anticipate these changes will be significant to our financial statements. The Company will adopt the standard in the first quarter of 2018 with a cumulative effect adjustment to opening retained earnings, if such amount is material to the Company’s financial statements. ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01, among other things: (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income; (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale. ASU 2016-01 is effective for the Company on January 1, 2018 and is not expected to have a significant impact on our financial statements. ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 amends existing lease accounting guidance, including the requirement to recognize most lease arrangements on the balance sheet. The adoption of this standard will result in the Company recognizing a right-of-use asset representing its rights to use the underlying asset for the lease term with an offsetting lease liability. ASU 2016-02 is effective for the company on January 1, 2019, with early adoption permitted and the adoption requires a modified retrospective approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company has not yet concluded whether it will adopt the standard prior to January 1, 2019; however, the Company has aggregated a list of all leases and if the standard would have been effective at September 30, 2017, it would not have had an impact on any borrowings or financial covenants that are relevant to the Company. Management estimates that the impact to the Bank’s and the Company’s regulatory capital ratios would be a decrease of approximately five basis points or less, which would be due to an increase in total assets and risk-weighted assets, given our lease arrangements for financial centers and other locations. ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 amends current guidance on the impairment of financial instruments. ASU 2016-13 adds an impairment model known as the current expected credit loss (“CECL”) model that is based on expected losses rather than incurred losses. For the Company, the CECL model will apply mainly to held-to-maturity investment securities, loans and loan commitments. ASU 2016-13 will be effective for the Company for fiscal years beginning after December 15, 2019, and the Company is permitted to early adopt the new guidance for fiscal years beginning after December 15, 2018. ASU 2016-13 will significantly change the accounting for credit impairments. The new guidance will require the Company to modify current processes and systems for establishing the allowance for loan losses and OTTI to ensure they comply with the requirements of the new standard. The Company engaged a nationally recognized accounting firm to assist management in performing an implementation readiness assessment. During the first quarter of 2017, the Company, in conjunction with our advisor, established a CECL program steering committee, identified significant work streams and created a CECL program project timeline. During the second quarter of 2017, the Company evaluated several third-party models in order to determine the CECL modeling approach that will be used for the Company’s loan portfolios. During the third quarter of 2017, the Company selected vendors that will assist in data analytics and modeling. The Company is unable to estimate the impact of adopting ASU 2016-13 at this time, however, we anticipate the allowance for loan losses will be greater under the CECL model compared to the current incurred loss model and that the composition of the loan and securities portfolio as well as the status of the economic environment will be significant factors that impact the balance at date of adoption. ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates the second step in the goodwill impairment test which requires an entity to determine the implied fair value of the reporting unit’s goodwill. Instead, an entity should recognize an impairment loss if the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, with the impairment loss not to exceed the amount of goodwill allocated to the reporting unit. The standard is effective for the Company beginning January 1, 2020, with early adoption permitted for goodwill impairment tests performed after January 1, 2017. The Company expects to early adopt this standard in our next goodwill impairment test cycle in 2017. Management expects ASU 2017-04 will not have a significant impact on the Company’s financial statements. ASU 2017-08, “Premium Amortization on Purchased Callable Debt Securities.” ASU 2017-08 shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. Today, entities generally amortize the premium over the contractual life of the security. The new guidance does not change the accounting for purchased callable debt securities held at a discount as discounts continue to be amortized to maturity. ASU No. 2017-08 is effective for interim and annual reporting periods beginning after December 15, 2018 and early adoption is permitted. The guidance includes a modified retrospective transition approach under which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. Management intends to adopt this standard effective January 1, 2018 and the impact of adoption will not be significant on our financial statements. ASU 2017-09, “Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting.” ASU 2017-09 clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. Under ASU 2017-09, an entity will not apply modification accounting to a share-based payment award if all of the following are the same immediately before and after the change: (i) the fair value of the award, (ii) the vesting conditions of the award and (iii) the classification of the award as an equity or liability instrument. ASU 2017-09 will be effective for the Company on January 1, 2018 and is not expected to have a significant impact on the Company’s financial statements. ASU 2017-12, “Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities.” ASU 2017-12 amends the hedge accounting recognition and presentation requirements in ASC 815 to improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities to better align the entity’s financial reporting for hedging relationships with those risk management activities and to reduce the complexity of and simplify the application of hedge accounting. ASU 2017-12 will be effective for the Company on January 1, 2019 and is not expected to have a significant impact on the Company’s financial statements.

Merger with Astoria Financial C

Merger with Astoria Financial Corporation	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Merger with Astoria Financial Corporation	Merger with Astoria Financial Corporation On October 2, 2017 , the Company completed the Astoria Merger. In accordance with the definitive merger agreement, the transaction was stock-for-stock merger and valued at $2,189,687 , including $33 for fractional shares paid in cash. Based on the closing price of the Company’s common stock on September 29, 2017 , Astoria shareholders received a fixed ratio of 0.875 shares of Company common stock for each share of Astoria common stock held. Sterling shareholders own approximately 60.5% of stock in the combined company and Astoria shareholders own approximately 39.5% . In connection with the Astoria Merger, the Company issued 5.4 million depositary shares, each representing 1/40th interest in a share of 6.50% Non-cumulative Perpetual Preferred Stock, Series A at $25.00 per depositary share in exchange for 5.4 million depositary shares of Astoria, each of which represented 1/40th interest in a share of 6.50% Non-cumulative Perpetual Preferred Stock Series C at $25.00 per depositary share. Pro forma information for the year ended December 31, 2016 was as follows: For the year ended December 31, 2016 Pro Forma Condensed Income Statement Information: Net interest income $ 818,907 Provision for loan losses 10,849 Income before income taxes 385,185 Net income 251,173 Pro Forma Condensed Combined Balance Sheet Information: Portfolio loans, net 19,530,795 Total assets 29,510,290 Deposits 18,956,004 Total stockholders’ equity 4,218,852 The Company has engaged an independent third-party to assist management in estimating the fair value of the majority of the assets acquired and liabilities to be assumed. Additional disclosures have been omitted because the information needed for the disclosures is not yet available due to the close proximity of the closing date with the date of this Quarterly Report on Form 10-Q.

Basis of Financial Statement 29

Basis of Financial Statement Presentation (Policies)	9 Months Ended
	Sep. 30, 2017
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 the Company’s 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, 2016 , included in our Annual Report on Form 10-K, as filed with the SEC on February 27, 2017 (the “2016 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 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 loan losses and the status of contingencies, and are subject to change.
Recently Issued Accounting Standards, Adopted and Not Yet Adopted	Adoption of New Accounting Standard Effective January 1, 2017, the Company adopted the provisions of Accounting Standard Update (“ASU”) 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” This standard requires that all income tax effects related to settlements of stock-based compensation awards be reported in earnings as an increase or decrease to income tax expense. The adoption of this standard reduced reported income tax expense by $64 in the third quarter of 2017, and $806 in the nine months ended September 30, 2017. The Company also elected to recognize forfeitures of stock-based compensation awards as they occur, which did not have a material impact to the consolidated financial statements. Recently Issued Accounting Standards Not Yet Adopted ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” ASU 2014-09 implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. This standard is effective for the Company on January 1, 2018. Our revenue is comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and non-interest income, which is subject to ASU 2014-09. We expect that ASU 2014-09 may require the Company to change how it recognizes certain recurring revenue streams within accounts receivable management and factoring commissions and other categories of non-interest income; however, we do not anticipate these changes will be significant to our financial statements. The Company will adopt the standard in the first quarter of 2018 with a cumulative effect adjustment to opening retained earnings, if such amount is material to the Company’s financial statements. ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01, among other things: (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income; (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale. ASU 2016-01 is effective for the Company on January 1, 2018 and is not expected to have a significant impact on our financial statements. ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 amends existing lease accounting guidance, including the requirement to recognize most lease arrangements on the balance sheet. The adoption of this standard will result in the Company recognizing a right-of-use asset representing its rights to use the underlying asset for the lease term with an offsetting lease liability. ASU 2016-02 is effective for the company on January 1, 2019, with early adoption permitted and the adoption requires a modified retrospective approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company has not yet concluded whether it will adopt the standard prior to January 1, 2019; however, the Company has aggregated a list of all leases and if the standard would have been effective at September 30, 2017, it would not have had an impact on any borrowings or financial covenants that are relevant to the Company. Management estimates that the impact to the Bank’s and the Company’s regulatory capital ratios would be a decrease of approximately five basis points or less, which would be due to an increase in total assets and risk-weighted assets, given our lease arrangements for financial centers and other locations. ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 amends current guidance on the impairment of financial instruments. ASU 2016-13 adds an impairment model known as the current expected credit loss (“CECL”) model that is based on expected losses rather than incurred losses. For the Company, the CECL model will apply mainly to held-to-maturity investment securities, loans and loan commitments. ASU 2016-13 will be effective for the Company for fiscal years beginning after December 15, 2019, and the Company is permitted to early adopt the new guidance for fiscal years beginning after December 15, 2018. ASU 2016-13 will significantly change the accounting for credit impairments. The new guidance will require the Company to modify current processes and systems for establishing the allowance for loan losses and OTTI to ensure they comply with the requirements of the new standard. The Company engaged a nationally recognized accounting firm to assist management in performing an implementation readiness assessment. During the first quarter of 2017, the Company, in conjunction with our advisor, established a CECL program steering committee, identified significant work streams and created a CECL program project timeline. During the second quarter of 2017, the Company evaluated several third-party models in order to determine the CECL modeling approach that will be used for the Company’s loan portfolios. During the third quarter of 2017, the Company selected vendors that will assist in data analytics and modeling. The Company is unable to estimate the impact of adopting ASU 2016-13 at this time, however, we anticipate the allowance for loan losses will be greater under the CECL model compared to the current incurred loss model and that the composition of the loan and securities portfolio as well as the status of the economic environment will be significant factors that impact the balance at date of adoption. ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates the second step in the goodwill impairment test which requires an entity to determine the implied fair value of the reporting unit’s goodwill. Instead, an entity should recognize an impairment loss if the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, with the impairment loss not to exceed the amount of goodwill allocated to the reporting unit. The standard is effective for the Company beginning January 1, 2020, with early adoption permitted for goodwill impairment tests performed after January 1, 2017. The Company expects to early adopt this standard in our next goodwill impairment test cycle in 2017. Management expects ASU 2017-04 will not have a significant impact on the Company’s financial statements. ASU 2017-08, “Premium Amortization on Purchased Callable Debt Securities.” ASU 2017-08 shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. Today, entities generally amortize the premium over the contractual life of the security. The new guidance does not change the accounting for purchased callable debt securities held at a discount as discounts continue to be amortized to maturity. ASU No. 2017-08 is effective for interim and annual reporting periods beginning after December 15, 2018 and early adoption is permitted. The guidance includes a modified retrospective transition approach under which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. Management intends to adopt this standard effective January 1, 2018 and the impact of adoption will not be significant on our financial statements. ASU 2017-09, “Compensation - Stock Compensation (Topic 718) - Scope of Modification Accounting.” ASU 2017-09 clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. Under ASU 2017-09, an entity will not apply modification accounting to a share-based payment award if all of the following are the same immediately before and after the change: (i) the fair value of the award, (ii) the vesting conditions of the award and (iii) the classification of the award as an equity or liability instrument. ASU 2017-09 will be effective for the Company on January 1, 2018 and is not expected to have a significant impact on the Company’s financial statements. ASU 2017-12, “Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities.” ASU 2017-12 amends the hedge accounting recognition and presentation requirements in ASC 815 to improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities to better align the entity’s financial reporting for hedging relationships with those risk management activities and to reduce the complexity of and simplify the application of hedge accounting. ASU 2017-12 will be effective for the Company on January 1, 2019 and is not expected to have a significant impact on the Company’s financial statements.
Fair Value Measurement	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. Impaired Loans Loans that meet certain criteria are evaluated individually for impairment. Generally, commercial loans less than $250 and residential mortgage and consumer loans, including HELOCs, less than $500 are evaluated for impairment on a pooled basis. Impairment amounts are generally based on the fair value of the underlying collateral supporting the loan and, as a result, the carrying value of the loan less the calculated impairment amount applicable to that loan does not necessarily represent the fair value of the loan. Real estate collateral is valued using independent appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable by market participants. However, due to the substantial judgment applied and limited volume of activity as compared to other assets, fair value of the underlying collateral is based on Level 3 inputs. Estimates of fair value used for collateral supporting commercial loans generally are based on assumptions not observable in the market place and are also based on Level 3 inputs. Impaired loans are remeasured at least quarterly and their carrying values are adjusted as needed. When an impaired loan is collateral dependent, the Company charges-off the difference between the recorded investment in the loan and the appraised value less cost to sell. A discount for estimated costs to dispose of the asset and overall marketability is used when estimating the amount of impairment. Derivatives The fair values of derivatives are based on valuation models using current market terms (including interest rates and fees), the remaining terms of the agreements, and the creditworthiness of the counterparty as of the measurement date (Level 2 inputs). The Company’s derivatives consist of interest rate swaps. See Note 9. “Derivatives” for additional information. Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are 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 the Company’s creditworthiness, among other items, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. The Company’s 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 the Company’s 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; 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 usually coincide with the Company’s monthly and/or quarterly valuation process. Investment Securities Available for Sale The majority of the Company’s available for sale investment securities are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains 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. The Company reviews 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, the Company does not purchase investment securities that have a complicated structure. The Company’s 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, the Company validates, 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. Other Real Estate Owned Other real estate owned is initially recorded at fair value less costs to sell when acquired, which establishes a new cost basis. When an asset is acquired, the excess of the recorded investment in the loan over the fair value less cost to sell is charged to the allowance for loan losses. These assets are subsequently accounted for at the lower of cost or fair value less costs to sell and are primarily comprised of commercial and residential real estate property. If the fair value declines, a write-down is recorded in other real estate owned expense, net on the income statement. Fair value is generally determined using appraisals or other indications of value based on comparable sales of similar properties or assumptions generally observable in the marketplace. Adjustments are routinely made in the appraisal process by independent appraisers for differences between comparable sales and income data available (in the case of income producing properties). The fair value is derived using Level 3 inputs. Appraisals are reviewed by the Company’s credit department and an external loan review consultant and verified by officers in the Company’s credit administration area. The following paragraphs summarize the principal methods and assumptions used by the Company to estimate the fair value of the Company’s financial instruments: Loans The estimated fair value approximates the carrying value for variable-rate loans that reprice frequently with no significant change in credit risk. The fair value of fixed-rate loans and variable-rate loans which reprice on an infrequent basis is estimated by discounting future cash flows using the current interest rates at which similar loans with similar terms would be made to borrowers of similar credit quality. An overall valuation adjustment is made for specific credit risks, as well as general portfolio credit risk. FHLB Stock and FRB Stock The redeemable carrying amount of these securities with limited marketability approximates their fair value. Deposits and Mortgage Escrow Funds Deposits with no stated maturity (such as demand, money market and savings deposits) are assigned fair values equal to the carrying amounts payable on demand. Certificates of deposit and mortgage escrow funds are segregated by account type and original term, and fair values are estimated by discounting the contractual cash flows. The discount rate for each account grouping is equivalent to the current market rates for deposits of similar type and maturity. These fair values do not include the value of core deposit relationships that comprise a significant portion of the Company’s deposits. We believe that the Company’s core deposit relationships provide a relatively stable, low-cost funding source that has a substantial value separate from the deposit balances. FHLB Borrowings, Other Borrowings, Senior Notes and Subordinated Notes The estimated fair value approximates the carrying value for short-term borrowings. The fair value of long-term fixed-rate borrowings is estimated using quoted market prices, if available, or by discounting future cash flows using current interest rates for similar financial instruments. Accrued Interest Receivable/Payable The carrying amounts of accrued interest approximate fair value and are classified in accordance with the related instrument. Other Financial Instruments Other financial assets and liabilities listed in the tables above have estimated fair values that approximate their respective carrying amounts because the instruments are payable on demand or have short-term maturities and present relatively low credit risk and interest rate risk. Fair Value of Financial Instruments Fair values for financial instruments must be estimated by management using techniques such as discounted cash flow analysis and comparison to similar instruments. These estimates are highly subjective and require judgments regarding significant matters, such as the amount and timing of future cash flows and the selection of discount rates that appropriately reflect market and credit risks. Changes in these judgments often have a material effect on the fair value estimates. Since these estimates are made as of a specific point in time, they are susceptible to material near-term changes. Fair values disclosed in accordance with FASB ASC Topic 825 do not reflect any premium or discount that could result from the sale of a large volume of a particular financial instrument, nor do they reflect possible tax ramifications or estimated transaction costs. Mortgage Servicing Rights Mortgage servicing rights are carried at the lower of cost or estimated fair value. The fair value of mortgage servicing rights is estimated using a discounted cash flow model that is prepared by an independent third-party valuation provider and is performed on a quarterly basis. The significant assumptions, which are assumptions we believe other market participants would use, include the following: market discount rates, prepayment speeds, servicing revenue, the cost of servicing and loan default rates. The market discount rates and prepayment speeds are considered by management to be two of the most significant inputs into the determination of the estimated fair value. Due to the significant judgment involved, the determination of estimated fair value of mortgage servicing rights relies upon Level 3 inputs.

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Summary of securities available for sale	A summary of amortized cost and estimated fair value of securities as of September 30, 2017 and December 31, 2016 is presented below. The term “MBS” refers to mortgage-backed securities and the term “CMOs” refers to collateralized mortgage obligations. Both of these terms are further defined in Note 17. “Fair Value Measurements”. September 30, 2017 Available for Sale Held to Maturity Amortized cost Gross unrealized gains Gross unrealized losses Fair value Amortized cost Gross unrecognized gains Gross unrecognized losses Fair value Residential MBS: Agency-backed $ 1,879,874 $ 3,392 $ (13,299 ) $ 1,869,967 $ 273,727 $ 1,767 $ (1,820 ) $ 273,674 CMOs/Other MBS 66,863 39 (851 ) 66,051 35,223 55 (466 ) 34,812 Total residential MBS 1,946,737 3,431 (14,150 ) 1,936,018 308,950 1,822 (2,286 ) 308,486 Other securities: Federal agencies 233,097 — (7,340 ) 225,757 58,531 1,557 — 60,088 Corporate 119,211 1,523 (690 ) 120,044 35,000 966 — 35,966 State and municipal 296,799 1,994 (1,536 ) 297,257 1,518,343 8,751 (14,754 ) 1,512,340 Other — — — — 15,750 125 — 15,875 Total other securities 649,107 3,517 (9,566 ) 643,058 1,627,624 11,399 (14,754 ) 1,624,269 Total securities $ 2,595,844 $ 6,948 $ (23,716 ) $ 2,579,076 $ 1,936,574 $ 13,221 $ (17,040 ) $ 1,932,755 December 31, 2016 Available for Sale Held to Maturity Amortized cost Gross unrealized gains Gross unrealized losses Fair value Amortized cost Gross unrecognized gains Gross unrecognized losses Fair value Residential MBS: Agency-backed $ 1,213,733 $ 569 $ (20,821 ) $ 1,193,481 $ 277,539 $ 1,353 $ (3,625 ) $ 275,267 CMOs/Other MBS 57,563 44 (926 ) 56,681 40,594 74 (572 ) 40,096 Total residential MBS 1,271,296 613 (21,747 ) 1,250,162 318,133 1,427 (4,197 ) 315,363 Other securities: Federal agencies 204,770 2 (10,793 ) 193,979 58,200 1,392 — 59,592 Corporate 43,464 150 (1,108 ) 42,506 35,048 431 (11 ) 35,468 State and municipal 245,304 739 (5,273 ) 240,770 974,290 3,571 (36,232 ) 941,629 Other — — — — 5,750 195 — 5,945 Total other securities 493,538 891 (17,174 ) 477,255 1,073,288 5,589 (36,243 ) 1,042,634 Total securities $ 1,764,834 $ 1,504 $ (38,921 ) $ 1,727,417 $ 1,391,421 $ 7,016 $ (40,440 ) $ 1,357,997
Summary of securities held-to-maturity	A summary of amortized cost and estimated fair value of securities as of September 30, 2017 and December 31, 2016 is presented below. The term “MBS” refers to mortgage-backed securities and the term “CMOs” refers to collateralized mortgage obligations. Both of these terms are further defined in Note 17. “Fair Value Measurements”. September 30, 2017 Available for Sale Held to Maturity Amortized cost Gross unrealized gains Gross unrealized losses Fair value Amortized cost Gross unrecognized gains Gross unrecognized losses Fair value Residential MBS: Agency-backed $ 1,879,874 $ 3,392 $ (13,299 ) $ 1,869,967 $ 273,727 $ 1,767 $ (1,820 ) $ 273,674 CMOs/Other MBS 66,863 39 (851 ) 66,051 35,223 55 (466 ) 34,812 Total residential MBS 1,946,737 3,431 (14,150 ) 1,936,018 308,950 1,822 (2,286 ) 308,486 Other securities: Federal agencies 233,097 — (7,340 ) 225,757 58,531 1,557 — 60,088 Corporate 119,211 1,523 (690 ) 120,044 35,000 966 — 35,966 State and municipal 296,799 1,994 (1,536 ) 297,257 1,518,343 8,751 (14,754 ) 1,512,340 Other — — — — 15,750 125 — 15,875 Total other securities 649,107 3,517 (9,566 ) 643,058 1,627,624 11,399 (14,754 ) 1,624,269 Total securities $ 2,595,844 $ 6,948 $ (23,716 ) $ 2,579,076 $ 1,936,574 $ 13,221 $ (17,040 ) $ 1,932,755 December 31, 2016 Available for Sale Held to Maturity Amortized cost Gross unrealized gains Gross unrealized losses Fair value Amortized cost Gross unrecognized gains Gross unrecognized losses Fair value Residential MBS: Agency-backed $ 1,213,733 $ 569 $ (20,821 ) $ 1,193,481 $ 277,539 $ 1,353 $ (3,625 ) $ 275,267 CMOs/Other MBS 57,563 44 (926 ) 56,681 40,594 74 (572 ) 40,096 Total residential MBS 1,271,296 613 (21,747 ) 1,250,162 318,133 1,427 (4,197 ) 315,363 Other securities: Federal agencies 204,770 2 (10,793 ) 193,979 58,200 1,392 — 59,592 Corporate 43,464 150 (1,108 ) 42,506 35,048 431 (11 ) 35,468 State and municipal 245,304 739 (5,273 ) 240,770 974,290 3,571 (36,232 ) 941,629 Other — — — — 5,750 195 — 5,945 Total other securities 493,538 891 (17,174 ) 477,255 1,073,288 5,589 (36,243 ) 1,042,634 Total securities $ 1,764,834 $ 1,504 $ (38,921 ) $ 1,727,417 $ 1,391,421 $ 7,016 $ (40,440 ) $ 1,357,997
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 September 30, 2017 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. September 30, 2017 Available for sale Held to maturity Amortized cost Fair value Amortized cost Fair value Remaining period to contractual maturity: One year or less $ 15,768 $ 15,798 $ 58,985 $ 59,078 One to five years 150,116 150,284 74,591 76,114 Five to ten years 314,574 310,946 248,328 252,765 Greater than ten years 168,649 166,030 1,245,720 1,236,312 Total securities with a stated maturity date 649,107 643,058 1,627,624 1,624,269 Residential MBS 1,946,737 1,936,018 308,950 308,486 Total securities $ 2,595,844 $ 2,579,076 $ 1,936,574 $ 1,932,755
Sale of securities	Sales of securities for the periods indicated below were as follows: For the three months ended For the nine months ended September 30, September 30, 2017 2016 2017 2016 Available for sale: Proceeds from sales $ 5,015 $ 300,047 $ 15,247 $ 858,531 Gross realized gains 1 4,272 7 10,667 Gross realized losses (22 ) (839 ) (281 ) (3,043 ) Income tax (benefit) expense on realized net (losses) gains (7 ) 1,141 (89 ) 2,535
Securities available for sale with unrealized losses, by length of time in continuous unrealized loss position	The following table summarizes securities available for sale with unrealized losses, segregated by the length of time in a continuous unrealized loss position for the periods presented below: Continuous unrealized loss position Less than 12 months 12 months or longer Total Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses Available for sale September 30, 2017 Residential MBS: Agency-backed $ 1,102,564 $ (7,583 ) $ 195,399 $ (5,716 ) $ 1,297,963 $ (13,299 ) CMOs/Other MBS 38,979 (298 ) 20,935 (553 ) 59,914 (851 ) Total residential MBS 1,141,543 (7,881 ) 216,334 (6,269 ) 1,357,877 (14,150 ) Other securities: Federal agencies 96,258 (1,443 ) 129,498 (5,897 ) 225,756 (7,340 ) Corporate 47,691 (115 ) 15,288 (575 ) 62,979 (690 ) State and municipal 43,670 (177 ) 58,042 (1,359 ) 101,712 (1,536 ) Total other securities 187,619 (1,735 ) 202,828 (7,831 ) 390,447 (9,566 ) Total $ 1,329,162 $ (9,616 ) $ 419,162 $ (14,100 ) $ 1,748,324 $ (23,716 ) December 31, 2016 Residential MBS: Agency-backed $ 1,101,641 $ (20,816 ) $ 686 $ (5 ) $ 1,102,327 $ (20,821 ) CMOs/Other MBS 38,841 (506 ) 15,239 (420 ) 54,080 (926 ) Total residential MBS 1,140,482 (21,322 ) 15,925 (425 ) 1,156,407 (21,747 ) Other securities: Federal agencies 185,504 (10,793 ) 4 — 185,508 (10,793 ) Corporate 10,399 (137 ) 14,942 (971 ) 25,341 (1,108 ) State and municipal 173,062 (5,196 ) 3,733 (77 ) 176,795 (5,273 ) Total other securities 368,965 (16,126 ) 18,679 (1,048 ) 387,644 (17,174 ) Total securities $ 1,509,447 $ (37,448 ) $ 34,604 $ (1,473 ) $ 1,544,051 $ (38,921 )
Securities held to maturity with unrealized losses, by length of time in continuous unrealized loss position	The following table summarizes securities held to maturity 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 value Unrecognized losses Fair value Unrecognized losses Fair value Unrecognized losses Held to maturity September 30, 2017 Residential MBS: Agency-backed $ 118,898 $ (1,428 ) $ 11,570 $ (392 ) $ 130,468 $ (1,820 ) CMOs/Other MBS 18,704 (209 ) 11,740 (257 ) 30,444 (466 ) Total residential MBS 137,602 (1,637 ) 23,310 (649 ) 160,912 (2,286 ) Other securities: State and municipal 594,870 (5,005 ) 415,640 (9,749 ) 1,010,510 (14,754 ) Total other securities 594,870 (5,005 ) 415,640 (9,749 ) 1,010,510 (14,754 ) Total $ 732,472 $ (6,642 ) $ 438,950 $ (10,398 ) $ 1,171,422 $ (17,040 ) December 31, 2016 Residential MBS: Agency-backed $ 185,116 $ (3,623 ) $ 213 $ (2 ) $ 185,329 $ (3,625 ) CMOs/Other MBS 34,786 (572 ) — — 34,786 (572 ) Total residential MBS 219,902 (4,195 ) 213 (2 ) 220,115 (4,197 ) Other securities: Corporate — — 5,037 (11 ) 5,037 (11 ) State and municipal 758,690 (36,169 ) 2,816 (63 ) 761,506 (36,232 ) Total other securities 758,690 (36,169 ) 7,853 (74 ) 766,543 (36,243 ) Total securities $ 978,592 $ (40,364 ) $ 8,066 $ (76 ) $ 986,658 $ (40,440 )
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: September 30, December 31, 2017 2016 Available for sale securities pledged for borrowings, at fair value $ 898,414 $ 67,599 Available for sale securities pledged for municipal deposits, at fair value 318,428 398,961 Available for sale securities pledged for customer back-to-back swaps, at fair value — 126 Held to maturity securities pledged for borrowings, at amortized cost 195,340 55,343 Held to maturity securities pledged for municipal deposits, at amortized cost 1,359,827 958,246 Total securities pledged $ 2,772,009 $ 1,480,275

Portfolio Loans (Tables)

Portfolio Loans (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Components of loan portfolio excluding loans held for sale	The composition of the Company’s loan portfolio, excluding loans held for sale, was the following for the periods presented below: September 30, December 31, 2017 2016 Commercial: Commercial and industrial (“C&I”): Traditional C&I $ 1,726,018 $ 1,404,774 Asset-based lending 794,632 741,942 Payroll finance 251,003 255,549 Warehouse lending 669,860 616,946 Factored receivables 236,051 214,242 Equipment financing 679,127 589,315 Public sector finance 484,973 349,182 Total C&I 4,841,664 4,171,950 Commercial mortgage: Commercial real estate 3,453,151 3,162,942 Multi-family 1,020,094 981,076 Acquisition, development & construction (“ADC”) 236,456 230,086 Total commercial mortgage 4,709,701 4,374,104 Total commercial 9,551,365 8,546,054 Residential mortgage 684,093 697,108 Consumer 258,077 284,068 Total portfolio loans 10,493,535 9,527,230 Allowance for loan losses (72,128 ) (63,622 ) Total portfolio loans, net $ 10,421,407 $ 9,463,608
Schedule of amounts and status of loans and TDRs	The following tables set forth the amounts and status of the Company’s loans, troubled debt restructurings (“TDRs”) and non-performing loans at September 30, 2017 and December 31, 2016 : September 30, 2017 Current 30-59 days past due 60-89 days past due 90+ days past due Non- accrual Total Traditional C&I $ 1,695,373 $ 2,694 $ 2,312 $ 230 $ 25,409 $ 1,726,018 Asset-based lending 794,632 — — — — 794,632 Payroll finance 250,999 — — — 4 251,003 Warehouse lending 669,860 — — — — 669,860 Factored receivables 236,051 — — — — 236,051 Equipment financing 670,455 4,400 432 — 3,840 679,127 Public sector finance 484,973 — — — — 484,973 Commercial real estate 3,426,670 4,352 1,177 78 20,874 3,453,151 Multi-family 1,020,039 — — — 55 1,020,094 ADC 234,628 — — — 1,828 236,456 Residential mortgage 671,083 1,956 978 84 9,992 684,093 Consumer 247,829 2,202 988 — 7,058 258,077 Total portfolio loans $ 10,402,592 $ 15,604 $ 5,887 $ 392 $ 69,060 $ 10,493,535 Total TDRs included above $ 16,212 $ 1,879 $ 527 $ — $ 27,967 $ 46,585 Non-performing loans: Loans 90+ days past due and still accruing $ 392 Non-accrual loans 69,060 Total non-performing loans $ 69,452 December 31, 2016 Current 30-59 days past due 60-89 days past due 90+ days past due Non- accrual Total Traditional C&I $ 1,376,181 $ 835 $ 817 $ 555 $ 26,386 $ 1,404,774 Asset-based lending 741,942 — — — — 741,942 Payroll finance 254,715 — 14 621 199 255,549 Warehouse lending 616,946 — — — — 616,946 Factored receivables 213,624 — — — 618 214,242 Equipment financing 583,835 2,142 1,092 — 2,246 589,315 Public sector finance 349,182 — — — — 349,182 Commercial real estate 3,140,561 967 — 406 21,008 3,162,942 Multi-family 981,005 — — — 71 981,076 ADC 224,817 — — — 5,269 230,086 Residential mortgage 675,750 5,509 951 108 14,790 697,108 Consumer 274,719 2,423 350 — 6,576 284,068 Total portfolio loans $ 9,433,277 $ 11,876 $ 3,224 $ 1,690 $ 77,163 $ 9,527,230 Total TDRs included above $ 11,032 $ 253 $ — $ — $ 1,989 $ 13,274 Non-performing loans: Loans 90+ days past due and still accruing $ 1,690 Non-accrual loans 77,163 Total non-performing loans $ 78,853
Schedule of additional analysis of non-accrual loans	The following table provides additional analysis of the Company’s non-accrual loans at September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 Recorded investment non-accrual loans Recorded investment PCI (1) non-accrual loans Recorded investment total non-accrual loans Unpaid principal balance non-accrual loans Recorded investment non-accrual loans Recorded investment PCI (1) non-accrual loans Recorded investment total non-accrual loans Unpaid principal balance non-accrual loans Traditional C&I $ 21,386 $ 4,023 $ 25,409 $ 25,752 $ 22,338 $ 4,048 $ 26,386 $ 26,386 Payroll finance 4 — 4 — 199 — 199 199 Factored receivables — — — — 618 — 618 618 Equipment financing — — 3,840 3,840 2,246 — 2,246 2,246 Commercial real estate 17,657 3,217 20,874 25,290 15,063 5,945 21,008 25,619 Multi-family 55 — 55 63 71 — 71 71 ADC 1,828 — 1,828 2,024 5,269 — 5,269 5,398 Residential mortgage 9,636 356 9,992 12,619 13,399 1,391 14,790 18,190 Consumer 6,337 721 7,058 8,649 5,719 857 6,576 7,865 Total $ 56,903 $ 8,317 $ 69,060 $ 78,237 $ 64,922 $ 12,241 $ 77,163 $ 86,592 (1) The Company acquired loans for which there was, at acquisition, both evidence of deterioration of credit quality since origination and the probability, at acquisition, that all contractually required payments would not be collected. These loans are classified as purchased credit impaired loans (“PCI loans”).
Impaired financing receivables	The following table sets forth loans evaluated for impairment by segment and the allowance evaluated by segment at September 30, 2017 : Loans evaluated by segment Allowance evaluated by segment Individually evaluated for impairment Collectively evaluated for impairment PCI loans Total loans Individually evaluated for impairment Collectively evaluated for impairment Total allowance for loan losses Traditional C&I $ 24,509 $ 1,689,063 $ 12,446 $ 1,726,018 $ — $ 17,200 $ 17,200 Asset-based lending — 792,382 2,250 794,632 — 4,776 4,776 Payroll finance — 251,003 — 251,003 — 2,191 2,191 Warehouse lending — 669,860 — 669,860 — 3,734 3,734 Factored receivables — 236,051 — 236,051 — 1,273 1,273 Equipment financing 5,789 673,338 — 679,127 — 4,461 4,461 Public sector finance — 484,973 — 484,973 — 1,352 1,352 Commercial real estate 14,719 3,400,311 38,121 3,453,151 — 23,203 23,203 Multi-family — 1,015,858 4,236 1,020,094 — 4,054 4,054 ADC 5,584 230,611 261 236,456 — 1,314 1,314 Residential mortgage 1,605 681,389 1,099 684,093 — 5,054 5,054 Consumer 3,216 253,421 1,440 258,077 — 3,516 3,516 Total portfolio loans $ 55,422 $ 10,378,260 $ 59,853 $ 10,493,535 $ — $ 72,128 $ 72,128 The following table sets forth loans evaluated for impairment by segment and the allowance evaluated by segment at December 31, 2016 : Loans evaluated by segment Allowance evaluated by segment Individually evaluated for impairment Collectively evaluated for impairment PCI loans Total loans Individually evaluated for impairment Collectively evaluated for impairment Total allowance for loan losses Traditional C&I $ 25,221 $ 1,365,466 $ 14,087 $ 1,404,774 $ — $ 12,864 $ 12,864 Asset-based lending — 724,247 17,695 741,942 — 3,316 3,316 Payroll finance 570 254,979 — 255,549 — 951 951 Warehouse lending — 616,946 — 616,946 — 1,563 1,563 Factored receivables — 214,242 — 214,242 — 1,669 1,669 Equipment financing 1,413 587,902 — 589,315 — 5,039 5,039 Public sector finance — 349,182 — 349,182 — 1,062 1,062 Commercial real estate 14,853 3,104,057 44,032 3,162,942 — 20,466 20,466 Multi-family — 976,710 4,366 981,076 — 4,991 4,991 ADC 9,025 216,094 4,967 230,086 — 1,931 1,931 Residential mortgage 2,545 692,396 2,167 697,108 — 5,864 5,864 Consumer 1,764 280,710 1,594 284,068 — 3,906 3,906 Total portfolio loans $ 55,391 $ 9,382,931 $ 88,908 $ 9,527,230 $ — $ 63,622 $ 63,622 The following table presents the average recorded investment and interest income recognized related to loans individually evaluated for impairment by segment for the three months ended September 30, 2017 and September 30, 2016 : For the three months ended September 30, 2017 September 30, 2016 QTD average recorded investment Interest income recognized Cash-basis interest income recognized QTD average recorded investment Interest income recognized Cash-basis interest income recognized Loans with no related allowance recorded: Traditional C&I $ 24,653 $ 8 $ — $ 27,173 $ 30 $ — Factored receivables — — — 247 — — Equipment financing 5,469 — — 2,028 — — Commercial real estate 13,258 95 — 16,414 64 — ADC 5,611 48 — 8,434 63 — Residential mortgage 1,060 — — 515 — — Consumer 2,356 — — 1,895 — — Total $ 52,407 $ 151 $ — $ 56,706 $ 157 $ — The following table presents loans individually evaluated for impairment, excluding PCI loans, by segment of loans at September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 Unpaid principal balance Recorded investment Unpaid principal balance Recorded investment Loans with no related allowance recorded: Traditional C&I $ 24,886 $ 24,509 $ 25,221 $ 25,221 Payroll finance — — 570 570 Equipment financing 5,789 5,789 1,413 1,413 Commercial real estate 16,488 14,719 16,365 14,853 ADC 5,850 5,584 9,025 9,025 Residential mortgage 1,943 1,605 2,545 2,545 Consumer 3,216 3,216 1,764 1,764 Total $ 58,172 $ 55,422 $ 56,903 $ 55,391 For the nine months ended September 30, 2017 September 30, 2016 YTD average recorded investment Interest income recognized Cash-basis interest income recognized YTD average recorded investment Interest income recognized Cash-basis interest income recognized Loans with no related allowance recorded: Traditional C&I $ 24,747 $ 22 $ — $ 22,370 $ 45 $ — Factored receivables — — — 82 — — Equipment financing 3,429 — — 1,259 — — Commercial real estate 10,410 271 — 13,516 135 — ADC 5,562 154 — 8,346 178 — Residential mortgage 787 — — 515 — — Consumer 1,927 — — 1,380 — — Total $ 46,862 $ 447 $ — $ 47,468 $ 358 $ —
Schedule of changes in the balance of accretable yield discount for PCI loans	The following table presents the changes in the balance of the accretable yield discount for PCI loans for the three and nine months ended September 30, 2017 and 2016 : For the three months ended September 30, For the nine months ended September 30, 2017 2016 2017 2016 Balance at beginning of period $ 10,877 $ 11,307 $ 11,117 $ 11,211 Balances acquired in the NSBC Acquisition — — — 2,200 Accretion of income (2,412 ) (1,168 ) (4,612 ) (3,447 ) Reclassification from non-accretable difference 1,412 1,398 3,372 1,573 Balance at end of period $ 9,877 $ 11,537 $ 9,877 $ 11,537
Troubled debt restructurings	The following table presents loans by segment modified as TDRs that occurred during the first nine months of 2017 and 2016 : September 30, 2017 September 30, 2016 Recorded investment Recorded investment Number Pre- modification Post- modification Number Pre- modification Post- modification Traditional C&I 1 $ 23,188 $ 23,188 — $ — $ — Equipment financing 2 3,088 3,088 — — — Commercial real estate 2 1,724 1,724 — — — ADC 1 797 797 — — — Residential mortgage 2 552 551 1 469 469 Total TDRs 8 $ 29,349 $ 29,348 1 $ 469 $ 469 The following tables set forth the amounts and past due status of the Company’s TDRs at September 30, 2017 and December 31, 2016 : September 30, 2017 Current loans 30-59 days past due 60-89 days past due 90+ days past due Non- accrual Total Traditional C&I $ 567 $ — $ — $ — $ 23,188 $ 23,755 Equipment financing 961 1,879 — — — 2,840 Commercial real estate 2,940 — — — 118 3,058 ADC 4,189 — — — 1,828 6,017 Residential mortgage 5,379 — 336 — 2,648 8,363 Consumer 2,176 — 191 — 185 2,552 Total $ 16,212 $ 1,879 $ 527 $ — $ 27,967 $ 46,585 December 31, 2016 Current loans 30-59 days past due 60-89 days past due 90+ days past due Non- accrual Total Traditional C&I $ 572 $ — $ — $ — $ 128 $ 700 Equipment financing — — — — 29 29 Commercial real estate 2,443 253 — — — 2,696 ADC 5,962 — — — 458 6,420 Residential mortgage 2,055 — — — 1,374 3,429 Total $ 11,032 $ 253 $ — $ — $ 1,989 $ 13,274

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Allowance for loan losses activity	Activity in the allowance for loan losses for the three and nine months ended September 30, 2017 and 2016 is summarized below: For the three months ended September 30, 2017 Beginning balance Charge-offs Recoveries Net charge-offs Provision / (reversal of) Ending balance Traditional C&I $ 15,506 $ (68 ) $ 316 $ 248 $ 1,446 $ 17,200 Asset-based lending 2,582 — 1 1 2,192 4,775 Payroll finance 1,287 (188 ) 1 (187 ) 1,091 2,191 Warehouse lending 2,435 — — — 1,299 3,734 Factored receivables 1,151 (564 ) 5 (559 ) 679 1,271 Equipment financing 5,735 (741 ) 45 (696 ) (577 ) 4,462 Public sector finance 1,887 — — — (535 ) 1,352 Commercial real estate 25,181 (1,345 ) 17 (1,328 ) (648 ) 23,205 Multi-family 5,028 — — — (974 ) 4,054 ADC 920 (5 ) — (5 ) 399 1,314 Residential mortgage 5,124 (389 ) — (389 ) 319 5,054 Consumer 3,315 (156 ) 48 (108 ) 309 3,516 Total allowance for loan losses $ 70,151 $ (3,456 ) $ 433 $ (3,023 ) $ 5,000 $ 72,128 Annualized net charge-offs to average loans outstanding: 0.12 % For the three months ended September 30, 2016 Beginning balance Charge-offs Recoveries Net charge-offs Provision / (reversal of) Ending balance Traditional C&I $ 11,057 $ (570 ) $ 381 $ (189 ) $ 434 $ 11,302 Asset-based lending 3,280 — — — 193 3,473 Payroll finance 1,165 — — — 145 1,310 Warehouse lending 652 — — — 829 1,481 Factored receivables 1,585 (60 ) 10 (50 ) 511 2,046 Equipment financing 5,346 (377 ) 123 (254 ) 108 5,200 Public sector finance 894 — — — 216 1,110 Commercial real estate 17,523 (630 ) 111 (519 ) 2,073 19,077 Multi-family 3,463 (399 ) — (399 ) 657 3,721 ADC 2,042 — — — (298 ) 1,744 Residential mortgage 4,875 (338 ) — (338 ) 347 4,884 Consumer 3,983 (259 ) 48 (211 ) 285 4,057 Total allowance for loan losses $ 55,865 $ (2,633 ) $ 673 $ (1,960 ) $ 5,500 $ 59,405 Annualized net charge-offs to average loans outstanding: 0.09 % For the nine months ended September 30, 2017 Beginning Charge-offs Recoveries Net Provision/ (reversal of) Ending balance Traditional C&I $ 12,864 $ (919 ) $ 978 $ 59 $ 4,277 $ 17,200 Asset-based lending 3,316 — 5 5 1,454 4,775 Payroll finance 951 (188 ) 1 (187 ) 1,427 2,191 Warehouse lending 1,563 — — — 2,171 3,734 Factored receivables 1,669 (871 ) 23 (848 ) 450 1,271 Equipment financing 5,039 (1,822 ) 331 (1,491 ) 914 4,462 Public sector finance 1,062 — — — 290 1,352 Commercial real estate 20,466 (2,372 ) 117 (2,255 ) 4,994 23,205 Multi-family 4,991 — — — (937 ) 4,054 ADC 1,931 (27 ) 269 242 (859 ) 1,314 Residential mortgage 5,864 (668 ) 159 (509 ) (301 ) 5,054 Consumer 3,906 (687 ) 177 (510 ) 120 3,516 Total allowance for loan losses $ 63,622 $ (7,554 ) $ 2,060 $ (5,494 ) $ 14,000 $ 72,128 Annualized net charge-offs to average loans outstanding: 0.08 % For the nine months ended September 30, 2016 Beginning Charge-offs Recoveries Net Provision/ (reversal of) Ending balance Traditional C&I $ 9,922 $ (1,488 ) $ 847 $ (641 ) $ 2,021 $ 11,302 Asset-based lending 2,793 — 62 62 618 3,473 Payroll finance 1,936 (28 ) 32 4 (630 ) 1,310 Warehouse lending 589 — — — 892 1,481 Factored receivables 1,457 (933 ) 51 (882 ) 1,471 2,046 Equipment financing 4,925 (1,406 ) 333 (1,073 ) 1,348 5,200 Public sector finance 547 — — — 563 1,110 Commercial real estate 13,861 (734 ) 185 (549 ) 5,765 19,077 Multi-family 2,741 (417 ) 2 (415 ) 1,395 3,721 ADC 2,009 — 104 104 (369 ) 1,744 Residential mortgage 5,007 (771 ) 29 (742 ) 619 4,884 Consumer 4,358 (1,302 ) 194 (1,108 ) 807 4,057 Total allowance for loan losses $ 50,145 $ (7,079 ) $ 1,839 $ (5,240 ) $ 14,500 $ 59,405 Annualized net charge-offs to average loans outstanding: 0.08 %
Financing receivable credit quality indicators	As of September 30, 2017 and December 31, 2016 , the risk category of gross loans by segment was as follows: September 30, 2017 December 31, 2016 Special mention Substandard Doubtful Special mention Substandard Doubtful Traditional C&I $ 10,717 $ 44,307 $ 794 $ 12,125 $ 28,977 $ 442 Asset-based lending 40,312 — — 35,373 — — Payroll finance 14,703 1,976 — — 820 — Factored receivables 270 — — 185 433 — Equipment financing 10,703 5,204 — 2,128 3,397 — Commercial real estate 35,105 28,970 — 39,190 29,463 — Multi-family — 634 — 7,072 658 — ADC 4,204 4,948 — 6,899 8,870 — Residential mortgage 978 10,958 — 951 15,796 — Consumer 992 7,208 1 646 6,738 — Total $ 117,984 $ 104,205 $ 795 $ 104,569 $ 95,152 $ 442

Goodwill and Other Intangible33

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2017
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: September 30, December 31, 2017 2016 Goodwill $ 696,600 $ 696,600 Other intangible assets: Core deposits $ 32,515 $ 37,455 Customer lists 6,312 7,683 Non-compete agreements 354 625 Trade name 20,500 20,500 Fair value of below market leases 9 90 Total $ 59,690 $ 66,353
Future amortization expense	The estimated aggregate future amortization expense for intangible assets remaining as of September 30, 2017 was as follows: Amortization expense Remainder of 2017 $ 2,175 2018 7,285 2019 6,074 2020 5,428 2021 5,022 2022 4,522 Thereafter 8,684 Total $ 39,190

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2017
Deposits [Abstract]
Summary of major classification of deposits	Deposit balances at September 30, 2017 and December 31, 2016 were as follows: September 30, December 31, 2017 2016 Non-interest bearing demand $ 3,134,359 $ 3,239,332 Interest bearing demand 2,397,172 2,220,456 Savings 807,845 747,031 Money market 4,137,702 3,277,686 Certificates of deposit 566,360 583,754 Total deposits $ 11,043,438 $ 10,068,259
List of Company's Brokered deposits	Brokered deposits at September 30, 2017 and December 31, 2016 were as follows: September 30, December 31, 2017 2016 Interest bearing demand $ 24,518 $ 426,437 Savings — 5,560 Money market 499,413 246,572 Money market - reciprocal brokered deposits 142,094 153,060 CDARs 1 and ICS 2 one way 259,106 — Total brokered deposits $ 925,131 $ 831,629 1 CDARs are deposits generated through the certificate of deposit account registry service. 2 ICS are deposits generated through the insured cash sweep program.

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Instruments [Abstract]
Schedule of debt	The Company’s borrowings and weighted average interest rates were as follows for the periods presented: September 30, December 31, 2017 2016 Amount Rate Amount Rate By type of borrowing: FHLB borrowings $ 3,016,000 1.40 % $ 1,791,000 1.01 % Repurchase agreements 28,403 0.74 16,642 0.75 Federal funds purchased 160,000 1.31 — — Senior Notes 76,719 5.98 76,469 5.98 Subordinated Notes 172,661 5.45 172,501 5.45 Total borrowings $ 3,453,783 1.70 % $ 2,056,612 1.56 % By remaining period to maturity: Less than one year $ 2,621,122 1.46 % $ 1,397,642 0.87 % One to two years 410,000 1.59 311,469 2.53 Two to three years 200,000 1.78 75,000 1.50 Three to four years 50,000 1.68 50,000 1.38 Four to five years — — 50,000 1.68 Greater than five years 172,661 5.45 172,501 5.45 Total borrowings $ 3,453,783 1.70 % $ 2,056,612 1.56 %

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedges, Assets [Abstract]
Summary of derivatives	Summary information as of September 30, 2017 and December 31, 2016 regarding these derivatives is presented below: Notional amount Average maturity (in years) Weighted average fixed rate Weighted average variable rate Fair value September 30, 2017 Included in other assets: Third-party interest rate swap $ 154,798 $ 442 Customer interest rate swap 352,213 4,341 Total $ 507,011 5.98 4.21 % 1 m Libor +2.28% $ 4,783 Included in other liabilities: Third-party interest rate swap (352,213 ) $ (2,918 ) Customer interest rate swap (154,798 ) (3,924 ) Total $ (507,011 ) 5.98 4.21 % 1 m Libor +2.28% $ (6,842 ) December 31, 2016 3rd party interest rate swap $ 296,282 5.63 3.94 % 1 m Libor + 2.29% $ 2,088 Customer interest rate swap (296,282 ) 5.63 3.94 1 m Libor + 2.29% (2,088 )

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2017
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 For the nine months ended September 30, September 30, 2017 2016 2017 2016 Income before income tax expense $ 66,444 $ 54,413 $ 185,939 $ 146,604 Tax at Federal statutory rate of 35% 23,253 19,045 65,076 51,312 State and local income taxes, net of Federal tax benefit 2,531 2,938 7,302 7,923 Tax exempt interest, net of disallowed interest (5,213 ) (3,942 ) (12,487 ) (7,734 ) Bank owned life insurance income (462 ) (643 ) (1,484 ) (1,518 ) Non-deductible acquisition related costs 237 — 1,193 — Low income housing tax credits (139 ) (118 ) (416 ) (352 ) Stock-based compensation benefit (1) (1 ) — (807 ) — Other, net 1,386 (289 ) 1,243 (1,985 ) Actual income tax expense $ 21,592 $ 16,991 $ 59,620 $ 47,646 Effective income tax rate 32.5 % 31.2 % 32.1 % 32.5 % (1 ) See Note 1. “Basis of Financial Statement Presentation - Adoption of New Accounting Standard” for additional information.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
Summary of Company's stock option activity	The following table summarizes the activity in the Company’s active stock-based compensation plans for the nine months ended September 30, 2017 : 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, 2017 3,639,838 932,223 $ 14.09 1,004,119 $ 11.00 Granted (556,534 ) 556,534 24.07 — — Stock awards vested — (155,498 ) 14.28 — — Exercised — — — (118,598 ) 10.06 Forfeited 68,113 (66,113 ) 18.84 (2,000 ) 13.18 Canceled/expired (4,907 ) — — — 13.18 Balance at September 30, 2017 3,146,510 1,267,146 $ 19.61 883,521 $ 11.12 Exercisable at September 30, 2017 776,767 $ 10.81
Schedule of stock-based compensation expense associated with stock options and non-vested stock awards	Stock-based compensation expense associated with stock options and non-vested stock awards and the related income tax benefit are presented below: For the three months ended For the nine months ended September 30, September 30, 2017 2016 2017 2016 Stock options $ 48 $ 95 $ 146 $ 345 Non-vested stock awards/performance units 1,921 1,579 5,456 4,615 Total $ 1,969 $ 1,674 $ 5,602 $ 4,960 Income tax benefit 640 557 1,821 1,652 Proceeds from stock option exercises 65 2,278 1,193 3,703
Unrecognized stock-based compensation expense	Unrecognized stock-based compensation expense as of September 30, 2017 was as follows: September 30, 2017 Stock options $ 12 Non-vested stock awards/performance units 14,894 Total $ 14,906

Other Post-Retirement Plans (Ta

Other Post-Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
Schedule of net pension (benefit) expense and post-retirement expense	Total other post-retirement expense is comprised of the following for the periods presented below: For the three months ended For the nine months ended September 30, September 30, 2017 2016 2017 2016 Service cost $ — $ — $ — $ — Interest cost 101 104 302 313 Net amortization and deferral 8 16 26 48 Total other post-retirement expense $ 109 $ 120 $ 328 $ 361

Other Non-interest Expense (Tab

Other Non-interest Expense (Tables)	9 Months Ended
	Sep. 30, 2017
Other Income and Expenses [Abstract]
Schedule of Other Non-interest Expense	Other non-interest expense items for the three and nine months ended September 30, 2017 and 2016 , respectively, are presented in the following table: For the three months ended For the nine months ended September 30, September 30, 2017 2016 2017 2016 Other non-interest expense: Advertising and promotion $ 649 $ 737 $ 2,034 $ 2,273 Professional fees 2,234 2,604 6,917 7,684 Data and check processing 2,512 2,402 7,402 6,417 Insurance & surety bond premium 841 821 2,065 2,503 Other 3,917 4,371 12,735 14,453 Total other non-interest expense $ 10,153 $ 10,935 $ 31,153 $ 33,330

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Computation of basic and diluted earnings per share	The following is a summary of the calculation of earnings per share (“EPS”): For the three months ended For the nine months ended September 30, September 30, 2017 2016 2017 2016 Net income $ 44,852 $ 37,422 $ 126,319 $ 98,958 Weighted average common shares outstanding for computation of basic EPS 135,346,791 130,239,193 135,276,634 130,049,358 Common-equivalent shares due to the dilutive effect of stock options and unvested performance share grants (1) 603,369 636,421 618,879 596,347 Weighted average common shares for computation of diluted EPS 135,950,160 130,875,614 135,895,513 130,645,705 Earnings per common share: Basic $ 0.33 $ 0.29 $ 0.93 $ 0.76 Diluted 0.33 0.29 0.93 0.76 Weighted average common shares that could be exercised that were anti-dilutive for the period (2) — — — — (1) Represents incremental shares computed using the treasury stock method. (2) Anti-dilutive shares are not included in determining diluted earnings per share. There were no anti-dilutive shares in the three and nine months ended September 30, 2017 or September 30, 2016 .

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 for the Company and the Bank under the Basel III Capital Rules. The minimum required capital amounts presented include the minimum required capital levels as of September 30, 2017 and December 31, 2016 based on the phase-in provisions of the Basel III Capital Rules and the minimum required capital levels as of January 1, 2019 when the Basel III Capital Rules have been fully phased-in. 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 phase-in schedule Minimum capital required - Basel III fully phased-in Required to be considered well- capitalized Capital amount Ratio Capital amount Ratio Capital amount Ratio Capital amount Ratio September 30, 2017 Common equity tier 1 to RWA: Sterling National Bank $ 1,276,461 10.41 % $ 704,960 5.75 % $ 858,212 7.00 % $ 796,911 6.50 % Sterling Bancorp 1,259,416 10.27 704,787 5.75 858,002 7.00 N/A N/A Tier 1 capital to RWA: Sterling National Bank 1,276,461 10.41 % 888,862 7.25 % 1,042,114 8.50 % 980,813 8.00 % Sterling Bancorp 1,259,416 10.27 888,645 7.25 1,041,859 8.50 N/A N/A Total capital to RWA: Sterling National Bank 1,521,795 12.41 % 1,134,065 9.25 % 1,287,317 10.50 % 1,226,017 10.00 % Sterling Bancorp 1,488,787 12.15 1,133,788 9.25 1,287,002 10.50 N/A N/A Tier 1 leverage ratio: Sterling National Bank 1,276,461 8.54 597,687 4.00 % 597,687 4.00 % 747,109 5.00 % Sterling Bancorp 1,259,416 8.42 598,037 4.00 598,037 4.00 N/A N/A Actual Minimum capital required - Basel III phase-in schedule Minimum capital required - Basel III fully phased-in Required to be considered well- capitalized Capital amount Ratio Capital amount Ratio Capital amount Ratio Capital amount Ratio December 31, 2016 Common equity tier 1 to RWA: Sterling National Bank $ 1,176,497 10.87 % $ 554,663 5.125 % $ 757,588 7.00 % $ 703,475 6.50 % Sterling Bancorp 1,160,739 10.73 554,474 5.125 757,330 7.00 N/A N/A Tier 1 capital to RWA: Sterling National Bank 1,176,497 10.87 % 717,003 6.625 % 919,928 8.50 % 865,815 8.00 % Sterling Bancorp 1,160,739 10.73 716,759 6.625 919,615 8.50 N/A N/A Total capital to RWA: Sterling National Bank 1,413,165 13.06 % 933,457 8.625 % 1,136,382 10.50 % 1,082,269 10.00 % Sterling Bancorp 1,377,547 12.73 933,139 8.625 1,135,995 10.50 N/A N/A Tier 1 leverage ratio: Sterling National Bank 1,176,497 9.08 % 518,308 4.000 % 518,308 4.00 % 647,885 5.00 % Sterling Bancorp 1,160,739 8.95 518,733 4.000 518,733 4.00 N/A N/A

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2017
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 the Company’s involvement in particular classes of off-balance sheet financial instruments, are summarized as follows: September 30, December 31, 2017 2016 Loan origination commitments $ 252,197 $ 245,319 Unused lines of credit 1,025,171 968,288 Letters of credit 131,611 114,582
Schedule of future minimum lease payments due	Future minimum lease payments due under non-cancelable operating leases at September 30, 2017 were as follows: Remainder of 2017 $ 2,478 2018 9,616 2019 8,513 2020 7,607 2021 6,168 2022 5,039 2023 and thereafter 15,716 $ 55,137

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Estimated fair value on a recurring basis	A summary of such investment securities available for sale and derivatives at September 30, 2017 and December 31, 2016 , respectively, were measured at estimated fair value on a recurring basis, is as follows: September 30, 2017 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Assets: Investment securities available for sale: Residential MBS (1) : Agency-backed $ 1,869,967 $ — $ 1,869,967 $ — CMOs (2) /Other MBS 66,051 — 66,051 — Total residential MBS 1,936,018 — 1,936,018 — Other securities: Federal agencies 225,757 — 225,757 — Corporate 120,044 — 120,044 — State and municipal 297,257 297,257 — Total other securities 643,058 — 643,058 — Total available for sale securities 2,579,076 — 2,579,076 — Swaps 4,783 — 4,783 — Total assets $ 2,583,859 $ — $ 2,583,859 $ — Liabilities: Swaps $ (6,842 ) $ — $ (6,842 ) $ — Total liabilities $ (6,842 ) $ — $ (6,842 ) $ — (1) Residential MBS are debt securities whose cash flows come from residential mortgage and consumer loans, such as mortgages and HELOCs. A residential MBS is comprised of a pool of mortgage loans created by financial institutions, including governmental agencies. The cash flows from each of the mortgage loans included in the pool are structured through a special purpose entity into various classes and tranches, which then issue securities backed by those cash flows to investors. (2) CMOs are debt securities that are collateralized by a specific pool of residential mortgage loans, in which the issuer of the CMOs can direct the payments of principal and interest received on the underlying collateral to achieve specific investor cash flow objectives. The Bank generally acquires planned-amortization class securities and CMOs with a sequential pay structure in order to manage the duration and extension risk inherent in these securities. December 31, 2016 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Assets: Investment securities available for sale: Residential MBS: Agency-backed $ 1,193,481 $ — $ 1,193,481 $ — CMOs/Other MBS 56,681 — 56,681 — Total residential MBS 1,250,162 — 1,250,162 — Federal agencies 193,979 — 193,979 — Corporate bonds 42,506 — 42,506 — State and municipal 240,770 240,770 — Total other securities 477,255 — 477,255 — Total available for sale securities 1,727,417 — 1,727,417 — Swaps 2,088 — 2,088 — Total assets $ 1,729,505 $ — $ 1,729,505 $ — Liabilities: Swaps $ (2,088 ) $ — $ (2,088 ) $ — Total liabilities $ (2,088 ) $ — $ (2,088 ) $ —
Impaired loans measured at estimated fair value on nonrecurring basis	A summary of the classes with impaired loans at September 30, 2017 and December 31, 2016 , respectively, is set forth below: September 30, 2017 Fair value Level 1 inputs Level 2 inputs Level 3 inputs C&I $ 177 $ — $ — $ 177 Commercial real estate 3,278 — — 3,278 Residential mortgage 921 — — 921 Total impaired loans measured at fair value $ 4,376 $ — $ — $ 4,376 December 31, 2016 Fair value Level 1 inputs Level 2 inputs Level 3 inputs Commercial real estate $ 6,786 $ — $ — $ 6,786 Total impaired loans measured at fair value $ 6,786 $ — $ — $ 6,786
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 September 30, 2017 : September 30, 2017 Carrying amount Level 1 inputs Level 2 inputs Level 3 inputs Financial assets: Cash and cash equivalents $ 407,203 $ 407,203 $ — $ — Securities available for sale 2,579,076 — 2,579,076 — Securities held to maturity 1,936,574 — 1,932,755 — Portfolio loans, net 10,421,407 — — 10,369,659 Accrued interest receivable on securities 26,283 — 26,283 — Accrued interest receivable on loans 31,278 — — 31,278 FHLB stock and FRB stock 191,276 — — — Swaps 4,783 — 4,783 — Financial liabilities: Non-maturity deposits (10,477,078 ) (10,477,078 ) — — Certificates of deposit (566,360 ) — (564,517 ) — FHLB borrowings (3,016,000 ) — (3,043,454 ) — Other borrowings (188,403 ) — (188,402 ) — Senior Notes (76,719 ) — (78,987 ) — Subordinated Notes (172,661 ) — (183,589 ) — Mortgage escrow funds (19,148 ) — (19,148 ) — Accrued interest payable on deposits (812 ) — (812 ) — Accrued interest payable on borrowings (9,949 ) — (9,949 ) — Swaps (6,842 ) — (6,842 ) — 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, 2016 : December 31, 2016 Carrying amount Level 1 inputs Level 2 inputs Level 3 inputs Financial assets: Cash and cash equivalents $ 293,646 $ 293,646 $ — $ — Securities available for sale 1,727,417 — 1,727,417 — Securities held to maturity 1,391,421 — 1,357,997 — Loans held for sale 41,889 — 41,889 — Portfolio loans, net 9,463,608 — — 9,461,469 Accrued interest receivable on securities 16,495 — 16,495 — Accrued interest receivable on loans 26,824 — — 26,824 FHLB stock and FRB stock 135,098 — — — Swaps 2,088 — 2,088 — Financial liabilities: Non-maturity deposits (9,484,505 ) (9,484,505 ) — — Certificates of deposit (583,754 ) — (582,811 ) — FHLB borrowings (1,791,000 ) — (1,788,676 ) — Other borrowings (16,642 ) — (16,642 ) — Senior Notes (76,469 ) — (79,283 ) — Subordinated Notes (172,501 ) — (169,813 ) — Mortgage escrow funds (13,572 ) — (13,572 ) — Accrued interest payable on deposits (663 ) — (663 ) — Accrued interest payable on borrowings (3,621 ) — (3,621 ) — Swaps (2,088 ) — (2,088 ) —

Accumulated Other Comprehensi45

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	Components of accumulated other comprehensive income (loss) (“AOCI”) were as follows as of the dates shown below: September 30, December 31, 2017 2016 Net unrealized holding loss on available for sale securities $ (16,768 ) $ (37,417 ) Related income tax benefit 6,623 14,780 Available for sale securities AOCI, net of tax (10,145 ) (22,637 ) Net unrealized holding loss on securities transferred to held to maturity (4,670 ) (5,395 ) Related income tax benefit 1,845 2,131 Securities transferred to held to maturity AOCI, net of tax (2,825 ) (3,264 ) Net unrealized holding loss on retirement plans (1,139 ) (1,213 ) Related income tax benefit 450 479 Retirement plans AOCI, net of tax (689 ) (734 ) AOCI $ (13,659 ) $ (26,635 ) The following table presents the changes in each component of AOCI for the three and nine months ended September 30, 2017 and 2016 : Net unrealized holding gain (loss) on available for sale securities Net unrealized holding gain (loss) on securities transferred to held to maturity Net unrealized holding (loss) gain on retirement plans Total For the three months ended September 30, 2017 Balance beginning of the period $ (12,704 ) $ (2,969 ) $ (695 ) $ (16,368 ) Other comprehensive gain before reclassification 2,538 — — 2,538 Amounts reclassified from AOCI 21 144 6 171 Total other comprehensive income 2,559 144 6 2,709 Balance at end of period $ (10,145 ) $ (2,825 ) $ (689 ) $ (13,659 ) For the three months ended September 30, 2016 Balance beginning of the period $ 15,391 $ (3,731 ) $ (730 ) $ 10,930 Other comprehensive (loss) before reclassification (1,278 ) — — (1,278 ) Amounts reclassified from AOCI (2,076 ) 328 (11 ) (1,759 ) Total other comprehensive (loss) income (3,354 ) 328 (11 ) (3,037 ) Balance at end of period $ 12,037 $ (3,403 ) $ (741 ) $ 7,893 Location in income statement where reclassification from AOCI is included Net (loss) gain on sale of securities Interest income on securities Compensation and benefits expense Net unrealized holding (loss) gain on available for sale securities Net unrealized holding (loss)gain on securities transferred to held to maturity Net unrealized holding (loss) gain on retirement plans Total For the nine months ended September 30, 2017 Balance beginning of the period $ (22,637 ) $ (3,264 ) $ (734 ) $ (26,635 ) Other comprehensive gain before reclassification 12,218 — — 12,218 Amounts reclassified from AOCI 274 439 45 758 Total other comprehensive income 12,492 439 45 12,976 Balance at end of period $ (10,145 ) $ (2,825 ) $ (689 ) $ (13,659 ) For the nine months ended September 30, 2016 Balance beginning of the period $ (6,999 ) $ (4,155 ) $ (970 ) $ (12,124 ) Other comprehensive gain before reclassification 23,649 — — 23,649 Amounts reclassified from AOCI (4,613 ) 752 229 (3,632 ) Total other comprehensive income 19,036 752 229 20,017 Balance at end of period $ 12,037 $ (3,403 ) $ (741 ) $ 7,893 Location in income statement where reclassification from AOCI is included Net (loss) gain on sale of securities Interest income on securities Compensation and benefits expense

Merger with Astoria Financial46

Merger with Astoria Financial Corporation (Tables)	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Business Acquisition, Pro Forma Information	Pro forma information for the year ended December 31, 2016 was as follows: For the year ended December 31, 2016 Pro Forma Condensed Income Statement Information: Net interest income $ 818,907 Provision for loan losses 10,849 Income before income taxes 385,185 Net income 251,173 Pro Forma Condensed Combined Balance Sheet Information: Portfolio loans, net 19,530,795 Total assets 29,510,290 Deposits 18,956,004 Total stockholders’ equity 4,218,852

Basis of Financial Statement 47

Basis of Financial Statement Presentation (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reduction of income tax expense	$ 64	$ 806

Acquisitions (Details)

Acquisitions (Details) - USD ($) $ in Thousands	Sep. 09, 2016	Mar. 31, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jun. 30, 2016
Business Acquisition [Line Items]
Portfolio loans purchased				$ 94,912	$ 163,320
Discount amount on acquired loan receivable				3,742		$ 1,788
Goodwill				$ 696,600		$ 696,600
NSBC
Business Acquisition [Line Items]
Percentage of outstanding common stock acquired							100.00%
Loans receivable acquired							$ 320,447
Premium paid for loans receivable acquired as a percent of gross loans acquired							5.90%
Premium paid for loans receivable acquired							$ 18,906
Liabilities assumed							4,839
Goodwill							25,698
Restructuring charges			$ 1,500
NSBC | Customer lists
Business Acquisition [Line Items]
Intangible asset acquired							$ 1,500
Estimated life		24 months
Traditional C&I | GE Capital
Business Acquisition [Line Items]
Portfolio loan acquired, unpaid principal balance	$ 169,760
Portfolio loans purchased	$ 163,282
Discount rate on acquired portfolio loan	4.00%
Discount amount on acquired loan receivable	$ 6,790

Securities - Amortized Cost to

Securities - Amortized Cost to Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available for Sale
Amortized cost	$ 2,595,844	$ 1,764,834
Gross unrealized gains	6,948	1,504
Gross unrealized losses	(23,716)	(38,921)
Available for sale, at fair value	2,579,076	1,727,417
Held to Maturity
Amortized cost	1,936,574	1,391,421
Gross unrealized gains	13,221	7,016
Gross unrealized losses	(17,040)	(40,440)
Fair value	1,932,755	1,357,997
Residential MBS:
Available for Sale
Amortized cost	1,946,737	1,271,296
Gross unrealized gains	3,431	613
Gross unrealized losses	(14,150)	(21,747)
Available for sale, at fair value	1,936,018	1,250,162
Held to Maturity
Amortized cost	308,950	318,133
Gross unrealized gains	1,822	1,427
Gross unrealized losses	(2,286)	(4,197)
Fair value	308,486	315,363
Other securities:
Available for Sale
Amortized cost	649,107	493,538
Gross unrealized gains	3,517	891
Gross unrealized losses	(9,566)	(17,174)
Available for sale, at fair value	643,058	477,255
Held to Maturity
Amortized cost	1,627,624	1,073,288
Gross unrealized gains	11,399	5,589
Gross unrealized losses	(14,754)	(36,243)
Fair value	1,624,269	1,042,634
Agency-backed | Residential MBS:
Available for Sale
Amortized cost	1,879,874	1,213,733
Gross unrealized gains	3,392	569
Gross unrealized losses	(13,299)	(20,821)
Available for sale, at fair value	1,869,967	1,193,481
Held to Maturity
Amortized cost	273,727	277,539
Gross unrealized gains	1,767	1,353
Gross unrealized losses	(1,820)	(3,625)
Fair value	273,674	275,267
CMOs/Other MBS | Residential MBS:
Available for Sale
Amortized cost	66,863	57,563
Gross unrealized gains	39	44
Gross unrealized losses	(851)	(926)
Available for sale, at fair value	66,051	56,681
Held to Maturity
Amortized cost	35,223	40,594
Gross unrealized gains	55	74
Gross unrealized losses	(466)	(572)
Fair value	34,812	40,096
Federal agencies | Other securities:
Available for Sale
Amortized cost	233,097	204,770
Gross unrealized gains	0	2
Gross unrealized losses	(7,340)	(10,793)
Available for sale, at fair value	225,757	193,979
Held to Maturity
Amortized cost	58,531	58,200
Gross unrealized gains	1,557	1,392
Gross unrealized losses	0	0
Fair value	60,088	59,592
Corporate | Other securities:
Available for Sale
Amortized cost	119,211	43,464
Gross unrealized gains	1,523	150
Gross unrealized losses	(690)	(1,108)
Available for sale, at fair value	120,044	42,506
Held to Maturity
Amortized cost	35,000	35,048
Gross unrealized gains	966	431
Gross unrealized losses	0	(11)
Fair value	35,966	35,468
State and municipal | Other securities:
Available for Sale
Amortized cost	296,799	245,304
Gross unrealized gains	1,994	739
Gross unrealized losses	(1,536)	(5,273)
Available for sale, at fair value	297,257	240,770
Held to Maturity
Amortized cost	1,518,343	974,290
Gross unrealized gains	8,751	3,571
Gross unrealized losses	(14,754)	(36,232)
Fair value	1,512,340	941,629
Other | Other securities:
Available for Sale
Amortized cost	0	0
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Available for sale, at fair value	0	0
Held to Maturity
Amortized cost	15,750	5,750
Gross unrealized gains	125	195
Gross unrealized losses	0	0
Fair value	$ 15,875	$ 5,945

Securities - Future Maturity (D

Securities - Future Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available for Sale
Amortized cost, One year or less	$ 15,768
Amortized cost, One to five years	150,116
Amortized cost, Five to ten years	314,574
Amortized cost, Greater than ten years	168,649
Amortized cost, Total securities with a stated maturity date	649,107
Amortized cost, Available for sale securities	2,595,844	$ 1,764,834
Fair value, One year or less	15,798
Fair value, One to five years	150,284
Fair value, Five to ten years	310,946
Fair value, Greater than ten years	166,030
Fair value, Total securities with a stated maturity date	643,058
Securities available for sale	2,579,076	1,727,417
Held to Maturity
Amortized cost, One year or less	58,985
Amortized cost, One to five years	74,591
Amortized cost, Five to ten years	248,328
Amortized cost, Greater than ten years	1,245,720
Amortized cost, Total securities with a stated maturity date	1,627,624
Amortized cost, Held to maturity securities	1,936,574	1,391,421
Fair value, One year or less	59,078
Fair value, One to five years	76,114
Fair value, Five to ten years	252,765
Fair value, Greater than ten years	1,236,312
Fair value, Total securities with a stated maturity date	1,624,269
Securities held to maturity	1,932,755	1,357,997
Residential MBS:
Available for Sale
Amortized cost, Available for sale securities	1,946,737	1,271,296
Securities available for sale	1,936,018	1,250,162
Held to Maturity
Amortized cost, Held to maturity securities	308,950	318,133
Securities held to maturity	$ 308,486	$ 315,363

Securities - Sale of Securities

Securities - Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 5,015	$ 300,047	$ 15,247	$ 858,531
Gross realized gains	1	4,272	7	10,667
Gross realized losses	(22)	(839)	(281)	(3,043)
Income tax (benefit) expense on realized net (losses) gains	$ (7)	$ 1,141	$ (89)	$ 2,535

Securities - Available-for-sale

Securities - Available-for-sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair value, Less than 12 months	$ 1,329,162	$ 1,509,447
Unrealized losses, Less than 12 months	(9,616)	(37,448)
Fair value, 12 months or longer	419,162	34,604
Unrealized losses, 12 months or longer	(14,100)	(1,473)
Fair value, Total	1,748,324	1,544,051
Unrealized losses, Total	(23,716)	(38,921)
Residential MBS:
Schedule of Available-for-sale Securities [Line Items]
Fair value, Less than 12 months	1,141,543	1,140,482
Unrealized losses, Less than 12 months	(7,881)	(21,322)
Fair value, 12 months or longer	216,334	15,925
Unrealized losses, 12 months or longer	(6,269)	(425)
Fair value, Total	1,357,877	1,156,407
Unrealized losses, Total	(14,150)	(21,747)
Other securities:
Schedule of Available-for-sale Securities [Line Items]
Fair value, Less than 12 months	187,619	368,965
Unrealized losses, Less than 12 months	(1,735)	(16,126)
Fair value, 12 months or longer	202,828	18,679
Unrealized losses, 12 months or longer	(7,831)	(1,048)
Fair value, Total	390,447	387,644
Unrealized losses, Total	(9,566)	(17,174)
Agency-backed | Residential MBS:
Schedule of Available-for-sale Securities [Line Items]
Fair value, Less than 12 months	1,102,564	1,101,641
Unrealized losses, Less than 12 months	(7,583)	(20,816)
Fair value, 12 months or longer	195,399	686
Unrealized losses, 12 months or longer	(5,716)	(5)
Fair value, Total	1,297,963	1,102,327
Unrealized losses, Total	(13,299)	(20,821)
CMOs/Other MBS | Residential MBS:
Schedule of Available-for-sale Securities [Line Items]
Fair value, Less than 12 months	38,979	38,841
Unrealized losses, Less than 12 months	(298)	(506)
Fair value, 12 months or longer	20,935	15,239
Unrealized losses, 12 months or longer	(553)	(420)
Fair value, Total	59,914	54,080
Unrealized losses, Total	(851)	(926)
Federal agencies | Other securities:
Schedule of Available-for-sale Securities [Line Items]
Fair value, Less than 12 months	96,258	185,504
Unrealized losses, Less than 12 months	(1,443)	(10,793)
Fair value, 12 months or longer	129,498	4
Unrealized losses, 12 months or longer	(5,897)	0
Fair value, Total	225,756	185,508
Unrealized losses, Total	(7,340)	(10,793)
Corporate | Other securities:
Schedule of Available-for-sale Securities [Line Items]
Fair value, Less than 12 months	47,691	10,399
Unrealized losses, Less than 12 months	(115)	(137)
Fair value, 12 months or longer	15,288	14,942
Unrealized losses, 12 months or longer	(575)	(971)
Fair value, Total	62,979	25,341
Unrealized losses, Total	(690)	(1,108)
State and municipal | Other securities:
Schedule of Available-for-sale Securities [Line Items]
Fair value, Less than 12 months	43,670	173,062
Unrealized losses, Less than 12 months	(177)	(5,196)
Fair value, 12 months or longer	58,042	3,733
Unrealized losses, 12 months or longer	(1,359)	(77)
Fair value, Total	101,712	176,795
Unrealized losses, Total	$ (1,536)	$ (5,273)

Securities - Held to Maturity S

Securities - Held to Maturity Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Fair value, Less than 12 months	$ 732,472	$ 978,592
Unrecognized losses, Less than 12 months	(6,642)	(40,364)
Fair value, 12 months or longer	438,950	8,066
Unrecognized losses, 12 months or longer	(10,398)	(76)
Fair value, Total	1,171,422	986,658
Unrecognized losses, Total	(17,040)	(40,440)
Residential MBS:
Schedule of Held-to-maturity Securities [Line Items]
Fair value, Less than 12 months	137,602	219,902
Unrecognized losses, Less than 12 months	(1,637)	(4,195)
Fair value, 12 months or longer	23,310	213
Unrecognized losses, 12 months or longer	(649)	(2)
Fair value, Total	160,912	220,115
Unrecognized losses, Total	(2,286)	(4,197)
Residential MBS: | Agency-backed
Schedule of Held-to-maturity Securities [Line Items]
Fair value, Less than 12 months	118,898	185,116
Unrecognized losses, Less than 12 months	(1,428)	(3,623)
Fair value, 12 months or longer	11,570	213
Unrecognized losses, 12 months or longer	(392)	(2)
Fair value, Total	130,468	185,329
Unrecognized losses, Total	(1,820)	(3,625)
Residential MBS: | CMOs/Other MBS
Schedule of Held-to-maturity Securities [Line Items]
Fair value, Less than 12 months	18,704	34,786
Unrecognized losses, Less than 12 months	(209)	(572)
Fair value, 12 months or longer	11,740	0
Unrecognized losses, 12 months or longer	(257)	0
Fair value, Total	30,444	34,786
Unrecognized losses, Total	(466)	(572)
Other securities:
Schedule of Held-to-maturity Securities [Line Items]
Fair value, Less than 12 months	594,870	758,690
Unrecognized losses, Less than 12 months	(5,005)	(36,169)
Fair value, 12 months or longer	415,640	7,853
Unrecognized losses, 12 months or longer	(9,749)	(74)
Fair value, Total	1,010,510	766,543
Unrecognized losses, Total	(14,754)	(36,243)
Other securities: | Corporate
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		5,037
Unrecognized losses, 12 months or longer		(11)
Fair value, Total		5,037
Unrecognized losses, Total		(11)
Other securities: | State and municipal
Schedule of Held-to-maturity Securities [Line Items]
Fair value, Less than 12 months	594,870	758,690
Unrecognized losses, Less than 12 months	(5,005)	(36,169)
Fair value, 12 months or longer	415,640	2,816
Unrecognized losses, 12 months or longer	(9,749)	(63)
Fair value, Total	1,010,510	761,506
Unrecognized losses, Total	$ (14,754)	$ (36,232)

Securities - Narrative (Details

Securities - Narrative (Details)	9 Months Ended
	Sep. 30, 2017security
Investments, Debt and Equity Securities [Abstract]
Number of securities which were in continuous unrealized loss position for less than 12 months	198
Number of securities which were in continuous unrealized loss position for 12 months or more	93

Securities - Securities Pledged

Securities - Securities Pledged for Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total securities pledged	$ 2,772,009	$ 1,480,275
Federal Home Loan Bank Borrowings
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	898,414	67,599
Held-to-maturity securities pledged as collateral	195,340	55,343
Municipal Deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	318,428	398,961
Held-to-maturity securities pledged as collateral	1,359,827	958,246
Interest rate swap
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	$ 0	$ 126

Portfolio Loans - Composition o

Portfolio Loans - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Components of loan portfolio, excluding loans held for sale
Traditional C&I	$ 1,726,018		$ 1,404,774
Asset-based lending	794,632		741,942
Payroll finance	251,003		255,549
Warehouse lending	669,860		616,946
Factored receivables	236,051		214,242
Equipment financing	679,127		589,315
Public sector finance	484,973		349,182
Total C&I	4,841,664		4,171,950
Commercial real estate	3,453,151		3,162,942
Multi-family	1,020,094		981,076
Acquisition, development & construction (“ADC”)	236,456		230,086
Total commercial mortgage	4,709,701		4,374,104
Total commercial	9,551,365		8,546,054
Residential mortgage	684,093		697,108
Consumer	258,077		284,068
Total portfolio loans	10,493,535		9,527,230
Allowance for loan losses	(72,128)	$ (70,151)	(63,622)	$ (59,405)	$ (55,865)	$ (50,145)
Portfolio loans, net	$ 10,421,407		$ 9,463,608

Portfolio Loans - Narrative (De

Portfolio Loans - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)loan	Sep. 30, 2016USD ($)loan	Jun. 30, 2017USD ($)	Dec. 31, 2016USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2015USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Net deferred loan origination costs	$ 3,742,000		$ 3,742,000			$ 1,788,000
Bank pledged mortgages	2,607,655,000		2,607,655,000			2,050,982,000
Non accrual loans	69,060,000		69,060,000			77,163,000
Maximum loan balance for credit risk to be evaluated on a homogeneous basis	500,000		500,000
Loans included in allowance for loan losses	72,128,000	$ 59,405,000	72,128,000	$ 59,405,000	$ 70,151,000	63,622,000	$ 55,865,000	$ 50,145,000
Impaired loans with an allowance recorded	0	0	0	0		0
Impaired loans cash-basis interest income recognized	0	0	$ 0	$ 0
Loans modified by TDR | loan			8	1
TDRs modified and subsequently defaulted | loan			0	0
PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Non accrual loans	8,317,000		$ 8,317,000			12,241,000
Loans evaluated by segment, Purchased credit impaired loans	59,853,000		59,853,000			88,908,000
Loans included in allowance for loan losses	775,000		775,000			685,000
Balance of PCI loans treated under cost recovery method	8,317,000		8,317,000			12,241,000
Asset-based lending
Financing Receivable, Allowance for Credit Losses [Line Items]
Non accrual loans	0		0			0
Loans included in allowance for loan losses	4,775,000	3,473,000	4,775,000	$ 3,473,000	2,582,000		3,280,000	2,793,000
Asset-based lending | PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans evaluated by segment, Purchased credit impaired loans	2,250,000		2,250,000			17,695,000
Asset-based lending | PCI Loans | NSBC
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans evaluated by segment, Purchased credit impaired loans	2,250,000		2,250,000
Warehouse lending
Financing Receivable, Allowance for Credit Losses [Line Items]
Non accrual loans	0		0			0
Loans included in allowance for loan losses	3,734,000	1,481,000	3,734,000	1,481,000	2,435,000		652,000	589,000
Warehouse lending | PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans evaluated by segment, Purchased credit impaired loans	0		0			0
Residential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Non accrual loans	9,992,000		9,992,000			14,790,000
Loans formally in process of foreclosure	6,780,000		6,780,000			9,263,000
Maximum loan balance for credit risk to be evaluated on a homogeneous basis	500,000		500,000
Loans included in allowance for loan losses	5,054,000	4,884,000	$ 5,054,000	$ 4,884,000	5,124,000		4,875,000	5,007,000
Loans modified by TDR | loan			2	1
Residential mortgage | PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Non accrual loans	356,000		$ 356,000			1,391,000
Loans evaluated by segment, Purchased credit impaired loans	1,099,000		1,099,000			2,167,000
Traditional C&I
Financing Receivable, Allowance for Credit Losses [Line Items]
Non accrual loans	25,409,000		25,409,000			26,386,000
Loans included in allowance for loan losses	17,200,000	11,302,000	$ 17,200,000	$ 11,302,000	15,506,000		11,057,000	9,922,000
Loans modified by TDR | loan			1	0
Traditional C&I | PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Non accrual loans	4,023,000		$ 4,023,000			4,048,000
Loans evaluated by segment, Purchased credit impaired loans	12,446,000		12,446,000			14,087,000
Public sector finance
Financing Receivable, Allowance for Credit Losses [Line Items]
Non accrual loans	0		0			0
Loans included in allowance for loan losses	1,352,000	$ 1,110,000	1,352,000	$ 1,110,000	$ 1,887,000		$ 894,000	$ 547,000
Public sector finance | PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans evaluated by segment, Purchased credit impaired loans	$ 0		$ 0			$ 0

Portfolio Loans - Status of Loa

Portfolio Loans - Status of Loans and TDRs (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Non-Performing loans:
Current loans	$ 10,402,592,000	$ 9,433,277,000
Non accrual loans	69,060,000	77,163,000
Total portfolio loans	10,493,535,000	9,527,230,000
Current loans	16,212,000	11,032,000
30-59 days past due	1,879,000	253,000
60-89 days past due	527,000	0
90 plus days past due	0	0
Non-Accrual	27,967,000	1,989,000
Total	46,585,000	13,274,000
Nonperforming loans
Non-Performing loans:
Non accrual loans	69,060,000	77,163,000
Non-performing loans:
Loans 90 days past due and still accruing	392,000	1,690,000
Total non-performing loans	69,452,000	78,853,000
Traditional C&I
Non-Performing loans:
Current loans	1,695,373,000	1,376,181,000
Non accrual loans	25,409,000	26,386,000
Total portfolio loans	1,726,018,000	1,404,774,000
Current loans	567,000	572,000
30-59 days past due	0	0
60-89 days past due	0	0
90 plus days past due	0	0
Non-Accrual	23,188,000	128,000
Total	23,755,000	700,000
Asset-based lending
Non-Performing loans:
Current loans	794,632,000	741,942,000
Non accrual loans	0	0
Total portfolio loans	794,632,000	741,942,000
Payroll finance
Non-Performing loans:
Current loans	250,999,000	254,715,000
Non accrual loans	4,000	199,000
Total portfolio loans	251,003,000	255,549,000
Warehouse lending
Non-Performing loans:
Current loans	669,860,000	616,946,000
Non accrual loans	0	0
Total portfolio loans	669,860,000	616,946,000
Factored receivables
Non-Performing loans:
Current loans	236,051,000	213,624,000
Non accrual loans	0	618,000
Total portfolio loans	236,051,000	214,242,000
Equipment financing
Non-Performing loans:
Current loans	670,455,000	583,835,000
Non accrual loans	3,840,000	2,246,000
Total portfolio loans	679,127,000	589,315,000
Current loans	961,000	0
30-59 days past due	1,879,000	0
60-89 days past due	0	0
90 plus days past due	0	0
Non-Accrual	0	29,000
Total	2,840,000	29,000
Public sector finance
Non-Performing loans:
Current loans	484,973,000	349,182,000
Non accrual loans	0	0
Total portfolio loans	484,973,000	349,182,000
Commercial real estate
Non-Performing loans:
Current loans	3,426,670,000	3,140,561,000
Non accrual loans	20,874,000	21,008,000
Total portfolio loans	3,453,151,000	3,162,942,000
Current loans	2,940,000	2,443,000
30-59 days past due	0	253,000
60-89 days past due	0	0
90 plus days past due	0	0
Non-Accrual	118,000	0
Total	3,058,000	2,696,000
Multi-family
Non-Performing loans:
Current loans	1,020,039,000	981,005,000
Non accrual loans	55,000	71,000
Total portfolio loans	1,020,094,000	981,076,000
ADC
Non-Performing loans:
Current loans	234,628,000	224,817,000
Non accrual loans	1,828,000	5,269,000
Total portfolio loans	236,456,000	230,086,000
Current loans	4,189,000	5,962,000
30-59 days past due	0	0
60-89 days past due	0	0
90 plus days past due	0	0
Non-Accrual	1,828,000	458,000
Total	6,017,000	6,420,000
Residential mortgage
Non-Performing loans:
Current loans	671,083,000	675,750,000
Non accrual loans	9,992,000	14,790,000
Total portfolio loans	684,093,000	697,108,000
Current loans	5,379,000	2,055,000
30-59 days past due	0	0
60-89 days past due	336,000	0
90 plus days past due	0	0
Non-Accrual	2,648,000	1,374,000
Total	8,363,000	3,429,000
Consumer
Non-Performing loans:
Current loans	247,829,000	274,719,000
Non accrual loans	7,058,000	6,576,000
Total portfolio loans	258,077,000	284,068,000
Current loans	2,176,000
30-59 days past due	0
60-89 days past due	191,000
90 plus days past due	0
Non-Accrual	185,000
Total	2,552,000
30-59 days past due
Non-Performing loans:
Past due loans	15,604,000	11,876,000
30-59 days past due | Traditional C&I
Non-Performing loans:
Past due loans	2,694,000	835,000
30-59 days past due | Asset-based lending
Non-Performing loans:
Past due loans	0	0
30-59 days past due | Payroll finance
Non-Performing loans:
Past due loans	0	0
30-59 days past due | Warehouse lending
Non-Performing loans:
Past due loans	0	0
30-59 days past due | Factored receivables
Non-Performing loans:
Past due loans	0	0
30-59 days past due | Equipment financing
Non-Performing loans:
Past due loans	4,400,000	2,142,000
30-59 days past due | Public sector finance
Non-Performing loans:
Past due loans	0	0
30-59 days past due | Commercial real estate
Non-Performing loans:
Past due loans	4,352,000	967,000
30-59 days past due | Multi-family
Non-Performing loans:
Past due loans	0	0
30-59 days past due | ADC
Non-Performing loans:
Past due loans	0	0
30-59 days past due | Residential mortgage
Non-Performing loans:
Past due loans	1,956,000	5,509,000
30-59 days past due | Consumer
Non-Performing loans:
Past due loans	2,202,000	2,423,000
60-89 days past due
Non-Performing loans:
Past due loans	5,887,000	3,224,000
60-89 days past due | Traditional C&I
Non-Performing loans:
Past due loans	2,312,000	817,000
60-89 days past due | Asset-based lending
Non-Performing loans:
Past due loans	0	0
60-89 days past due | Payroll finance
Non-Performing loans:
Past due loans	0	14,000
60-89 days past due | Warehouse lending
Non-Performing loans:
Past due loans	0	0
60-89 days past due | Factored receivables
Non-Performing loans:
Past due loans	0	0
60-89 days past due | Equipment financing
Non-Performing loans:
Past due loans	432,000	1,092,000
60-89 days past due | Public sector finance
Non-Performing loans:
Past due loans	0	0
60-89 days past due | Commercial real estate
Non-Performing loans:
Past due loans	1,177,000	0
60-89 days past due | Multi-family
Non-Performing loans:
Past due loans	0	0
60-89 days past due | ADC
Non-Performing loans:
Past due loans	0	0
60-89 days past due | Residential mortgage
Non-Performing loans:
Past due loans	978,000	951,000
60-89 days past due | Consumer
Non-Performing loans:
Past due loans	988,000	350,000
90 days past due
Non-Performing loans:
Past due loans	392,000	1,690,000
90 days past due | Traditional C&I
Non-Performing loans:
Past due loans	230,000	555,000
90 days past due | Asset-based lending
Non-Performing loans:
Past due loans	0	0
90 days past due | Payroll finance
Non-Performing loans:
Past due loans	0	621,000
90 days past due | Warehouse lending
Non-Performing loans:
Past due loans	0	0
90 days past due | Factored receivables
Non-Performing loans:
Past due loans	0	0
90 days past due | Equipment financing
Non-Performing loans:
Past due loans	0	0
90 days past due | Public sector finance
Non-Performing loans:
Past due loans	0	0
90 days past due | Commercial real estate
Non-Performing loans:
Past due loans	78,000	406,000
90 days past due | Multi-family
Non-Performing loans:
Past due loans	0	0
90 days past due | ADC
Non-Performing loans:
Past due loans	0	0
90 days past due | Residential mortgage
Non-Performing loans:
Past due loans	84,000	108,000
90 days past due | Consumer
Non-Performing loans:
Past due loans	$ 0	$ 0

Portfolio Loans - Nonaccrual Lo

Portfolio Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	$ 69,060	$ 77,163
Non-accrual loans, unpaid principal balance	78,237	86,592
Traditional C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	25,409	26,386
Non-accrual loans, unpaid principal balance	25,752	26,386
Payroll finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	4	199
Non-accrual loans, unpaid principal balance	0	199
Factored receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	0	618
Non-accrual loans, unpaid principal balance	0	618
Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	3,840	2,246
Non-accrual loans, unpaid principal balance	3,840	2,246
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	20,874	21,008
Non-accrual loans, unpaid principal balance	25,290	25,619
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	55	71
Non-accrual loans, unpaid principal balance	63	71
ADC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	1,828	5,269
Non-accrual loans, unpaid principal balance	2,024	5,398
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	9,992	14,790
Non-accrual loans, unpaid principal balance	12,619	18,190
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	7,058	6,576
Non-accrual loans, unpaid principal balance	8,649	7,865
Receivables without deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	56,903	64,922
Receivables without deteriorated credit quality | Traditional C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	21,386	22,338
Receivables without deteriorated credit quality | Payroll finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	4	199
Receivables without deteriorated credit quality | Factored receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	0	618
Receivables without deteriorated credit quality | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	0	2,246
Receivables without deteriorated credit quality | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	17,657	15,063
Receivables without deteriorated credit quality | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	55	71
Receivables without deteriorated credit quality | ADC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	1,828	5,269
Receivables without deteriorated credit quality | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	9,636	13,399
Receivables without deteriorated credit quality | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	6,337	5,719
Receivables acquired with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	8,317	12,241
Receivables acquired with deteriorated credit quality | Traditional C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	4,023	4,048
Receivables acquired with deteriorated credit quality | Payroll finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	0	0
Receivables acquired with deteriorated credit quality | Factored receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	0	0
Receivables acquired with deteriorated credit quality | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	0	0
Receivables acquired with deteriorated credit quality | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	3,217	5,945
Receivables acquired with deteriorated credit quality | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	0	0
Receivables acquired with deteriorated credit quality | ADC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	0	0
Receivables acquired with deteriorated credit quality | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	356	1,391
Receivables acquired with deteriorated credit quality | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment non-accrual loans	$ 721	$ 857

Portfolio Loans - Loans Evaluat

Portfolio Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	$ 55,422	$ 55,391
Loans evaluated by segment, Collectively evaluated for impairment	10,378,260	9,382,931
Total portfolio loans	10,493,535	9,527,230
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	72,128	63,622
Total allowance for loan losses	72,128	63,622
PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	59,853	88,908
Traditional C&I
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	24,509	25,221
Loans evaluated by segment, Collectively evaluated for impairment	1,689,063	1,365,466
Total portfolio loans	1,726,018	1,404,774
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	17,200	12,864
Total allowance for loan losses	17,200	12,864
Traditional C&I | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	12,446	14,087
Asset-based lending
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	0	0
Loans evaluated by segment, Collectively evaluated for impairment	792,382	724,247
Total portfolio loans	794,632	741,942
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	4,776	3,316
Total allowance for loan losses	4,776	3,316
Asset-based lending | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	2,250	17,695
Payroll finance
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	0	570
Loans evaluated by segment, Collectively evaluated for impairment	251,003	254,979
Total portfolio loans	251,003	255,549
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	2,191	951
Total allowance for loan losses	2,191	951
Payroll finance | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	0	0
Warehouse lending
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	0	0
Loans evaluated by segment, Collectively evaluated for impairment	669,860	616,946
Total portfolio loans	669,860	616,946
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	3,734	1,563
Total allowance for loan losses	3,734	1,563
Warehouse lending | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	0	0
Factored receivables
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	0	0
Loans evaluated by segment, Collectively evaluated for impairment	236,051	214,242
Total portfolio loans	236,051	214,242
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	1,273	1,669
Total allowance for loan losses	1,273	1,669
Factored receivables | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	0	0
Equipment financing
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	5,789	1,413
Loans evaluated by segment, Collectively evaluated for impairment	673,338	587,902
Total portfolio loans	679,127	589,315
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	4,461	5,039
Total allowance for loan losses	4,461	5,039
Equipment financing | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	0	0
Public sector finance
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	0	0
Loans evaluated by segment, Collectively evaluated for impairment	484,973	349,182
Total portfolio loans	484,973	349,182
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	1,352	1,062
Total allowance for loan losses	1,352	1,062
Public sector finance | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	0	0
Commercial real estate
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	14,719	14,853
Loans evaluated by segment, Collectively evaluated for impairment	3,400,311	3,104,057
Total portfolio loans	3,453,151	3,162,942
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	23,203	20,466
Total allowance for loan losses	23,203	20,466
Commercial real estate | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	38,121	44,032
Multi-family
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	0	0
Loans evaluated by segment, Collectively evaluated for impairment	1,015,858	976,710
Total portfolio loans	1,020,094	981,076
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	4,054	4,991
Total allowance for loan losses	4,054	4,991
Multi-family | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	4,236	4,366
ADC
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	5,584	9,025
Loans evaluated by segment, Collectively evaluated for impairment	230,611	216,094
Total portfolio loans	236,456	230,086
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	1,314	1,931
Total allowance for loan losses	1,314	1,931
ADC | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	261	4,967
Residential mortgage
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	1,605	2,545
Loans evaluated by segment, Collectively evaluated for impairment	681,389	692,396
Total portfolio loans	684,093	697,108
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	5,054	5,864
Total allowance for loan losses	5,054	5,864
Residential mortgage | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	1,099	2,167
Consumer
Loans evaluated for impairment by segment
Loans evaluated by segment, Individually evaluated for impairment	3,216	1,764
Loans evaluated by segment, Collectively evaluated for impairment	253,421	280,710
Total portfolio loans	258,077	284,068
Allowance evaluated by segment, Individually evaluated for impairment	0	0
Allowance evaluated by segment, Collectively evaluated for impairment	3,516	3,906
Total allowance for loan losses	3,516	3,906
Consumer | PCI Loans
Loans evaluated for impairment by segment
Loans evaluated by segment, Purchased credit impaired loans	$ 1,440	$ 1,594

Portfolio Loans - Accretable Yi

Portfolio Loans - Accretable Yield Discount for PCI Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 10,877	$ 11,307	$ 11,117	$ 11,211
Balances acquired in the NSBC Acquisition	0	0	0	2,200
Accretion of income	(2,412)	(1,168)	(4,612)	(3,447)
Reclassification from non-accretable difference	1,412	1,398	3,372	1,573
Balance at end of period	$ 9,877	$ 11,537	$ 9,877	$ 11,537

Portfolio Loans - Loans Individ

Portfolio Loans - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
With no related allowance recorded:
Unpaid principal balance with no related allowance recorded	$ 58,172	$ 56,903
Recorded investment with no related allowance recorded	55,422	55,391
Traditional C&I
With no related allowance recorded:
Unpaid principal balance with no related allowance recorded	24,886	25,221
Recorded investment with no related allowance recorded	24,509	25,221
Payroll finance
With no related allowance recorded:
Unpaid principal balance with no related allowance recorded	0	570
Recorded investment with no related allowance recorded	0	570
Equipment financing
With no related allowance recorded:
Unpaid principal balance with no related allowance recorded	5,789	1,413
Recorded investment with no related allowance recorded	5,789	1,413
Commercial real estate
With no related allowance recorded:
Unpaid principal balance with no related allowance recorded	16,488	16,365
Recorded investment with no related allowance recorded	14,719	14,853
ADC
With no related allowance recorded:
Unpaid principal balance with no related allowance recorded	5,850	9,025
Recorded investment with no related allowance recorded	5,584	9,025
Residential mortgage
With no related allowance recorded:
Unpaid principal balance with no related allowance recorded	1,943	2,545
Recorded investment with no related allowance recorded	1,605	2,545
Consumer
With no related allowance recorded:
Unpaid principal balance with no related allowance recorded	3,216	1,764
Recorded investment with no related allowance recorded	$ 3,216	$ 1,764

Portfolio Loans - Average Recor

Portfolio Loans - Average Recorded Investment and Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Average recorded investment with no related allowance	$ 52,407	$ 56,706	$ 46,862	$ 47,468
Interest income recognized with no related allowance	151	157	447	358
Cash-basis interest income recognized with no related allowance	0	0	0	0
Traditional C&I
Financing Receivable, Impaired [Line Items]
Average recorded investment with no related allowance	24,653	27,173	24,747	22,370
Interest income recognized with no related allowance	8	30	22	45
Cash-basis interest income recognized with no related allowance	0	0	0	0
Factored receivables
Financing Receivable, Impaired [Line Items]
Average recorded investment with no related allowance	0	247	0	82
Interest income recognized with no related allowance	0	0	0	0
Cash-basis interest income recognized with no related allowance	0	0	0	0
Equipment financing
Financing Receivable, Impaired [Line Items]
Average recorded investment with no related allowance	5,469	2,028	3,429	1,259
Interest income recognized with no related allowance	0	0	0	0
Cash-basis interest income recognized with no related allowance	0	0	0	0
Commercial real estate
Financing Receivable, Impaired [Line Items]
Average recorded investment with no related allowance	13,258	16,414	10,410	13,516
Interest income recognized with no related allowance	95	64	271	135
Cash-basis interest income recognized with no related allowance	0	0	0	0
ADC
Financing Receivable, Impaired [Line Items]
Average recorded investment with no related allowance	5,611	8,434	5,562	8,346
Interest income recognized with no related allowance	48	63	154	178
Cash-basis interest income recognized with no related allowance	0	0	0	0
Residential mortgage
Financing Receivable, Impaired [Line Items]
Average recorded investment with no related allowance	1,060	515	787	515
Interest income recognized with no related allowance	0	0	0	0
Cash-basis interest income recognized with no related allowance	0	0	0	0
Consumer
Financing Receivable, Impaired [Line Items]
Average recorded investment with no related allowance	2,356	1,895	1,927	1,380
Interest income recognized with no related allowance	0	0	0	0
Cash-basis interest income recognized with no related allowance	$ 0	$ 0	$ 0	$ 0

Portfolio Loans - Past Due Stat

Portfolio Loans - Past Due Status (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Current loans	$ 16,212	$ 11,032
30-59 days past due	1,879	253
60-89 days past due	527	0
90 plus days past due	0	0
Non- accrual	27,967	1,989
Total	46,585	13,274
Traditional C&I
Financing Receivable, Modifications [Line Items]
Current loans	567	572
30-59 days past due	0	0
60-89 days past due	0	0
90 plus days past due	0	0
Non- accrual	23,188	128
Total	23,755	700
Equipment financing
Financing Receivable, Modifications [Line Items]
Current loans	961	0
30-59 days past due	1,879	0
60-89 days past due	0	0
90 plus days past due	0	0
Non- accrual	0	29
Total	2,840	29
Commercial real estate
Financing Receivable, Modifications [Line Items]
Current loans	2,940	2,443
30-59 days past due	0	253
60-89 days past due	0	0
90 plus days past due	0	0
Non- accrual	118	0
Total	3,058	2,696
ADC
Financing Receivable, Modifications [Line Items]
Current loans	4,189	5,962
30-59 days past due	0	0
60-89 days past due	0	0
90 plus days past due	0	0
Non- accrual	1,828	458
Total	6,017	6,420
Residential mortgage
Financing Receivable, Modifications [Line Items]
Current loans	5,379	2,055
30-59 days past due	0	0
60-89 days past due	336	0
90 plus days past due	0	0
Non- accrual	2,648	1,374
Total	$ 8,363	$ 3,429

Portfolio Loans - Loans Modifie

Portfolio Loans - Loans Modified as TDRs (Details ) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)loan	Sep. 30, 2016USD ($)loan
Financing Receivable, Modifications [Line Items]
Number | loan	8	1
Recorded investment, Pre-modification	$ 29,349	$ 469
Recorded investment, Post-modification	$ 29,348	$ 469
Traditional C&I
Financing Receivable, Modifications [Line Items]
Number | loan	1	0
Recorded investment, Pre-modification	$ 23,188	$ 0
Recorded investment, Post-modification	$ 23,188	$ 0
Equipment financing
Financing Receivable, Modifications [Line Items]
Number | loan	2	0
Recorded investment, Pre-modification	$ 3,088	$ 0
Recorded investment, Post-modification	$ 3,088	$ 0
Commercial real estate
Financing Receivable, Modifications [Line Items]
Number | loan	2	0
Recorded investment, Pre-modification	$ 1,724	$ 0
Recorded investment, Post-modification	$ 1,724	$ 0
ADC
Financing Receivable, Modifications [Line Items]
Number | loan	1	0
Recorded investment, Pre-modification	$ 797	$ 0
Recorded investment, Post-modification	$ 797	$ 0
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number | loan	2	1
Recorded investment, Pre-modification	$ 552	$ 469
Recorded investment, Post-modification	$ 551	$ 469

Allowance for Loan Losses - All

Allowance for Loan Losses - Allowance Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	$ 70,151	$ 55,865	$ 63,622	$ 50,145
Charge-offs	(3,456)	(2,633)	(7,554)	(7,079)
Recoveries	433	673	2,060	1,839
Net charge-offs	(3,023)	(1,960)	(5,494)	(5,240)
Provision / (reversal of)	5,000	5,500	14,000	14,500
Ending Allowance for Loan Losses	$ 72,128	$ 59,405	$ 72,128	$ 59,405
Annualized net charge-offs to average loans outstanding	0.12%	0.09%	0.08%	0.08%
Traditional C&I
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	$ 15,506	$ 11,057		$ 9,922
Charge-offs	(68)	(570)	$ (919)	(1,488)
Recoveries	316	381	978	847
Net charge-offs	248	(189)	59	(641)
Provision / (reversal of)	1,446	434	4,277	2,021
Ending Allowance for Loan Losses	17,200	11,302	17,200	11,302
Asset-based lending
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	2,582	3,280		2,793
Charge-offs	0	0	0	0
Recoveries	1	0	5	62
Net charge-offs	1	0	5	62
Provision / (reversal of)	2,192	193	1,454	618
Ending Allowance for Loan Losses	4,775	3,473	4,775	3,473
Payroll finance
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	1,287	1,165		1,936
Charge-offs	(188)	0	(188)	(28)
Recoveries	1	0	1	32
Net charge-offs	(187)	0	(187)	4
Provision / (reversal of)	1,091	145	1,427	(630)
Ending Allowance for Loan Losses	2,191	1,310	2,191	1,310
Warehouse lending
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	2,435	652		589
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net charge-offs	0	0	0	0
Provision / (reversal of)	1,299	829	2,171	892
Ending Allowance for Loan Losses	3,734	1,481	3,734	1,481
Factored receivables
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	1,151	1,585		1,457
Charge-offs	(564)	(60)	(871)	(933)
Recoveries	5	10	23	51
Net charge-offs	(559)	(50)	(848)	(882)
Provision / (reversal of)	679	511	450	1,471
Ending Allowance for Loan Losses	1,271	2,046	1,271	2,046
Equipment financing
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	5,735	5,346		4,925
Charge-offs	(741)	(377)	(1,822)	(1,406)
Recoveries	45	123	331	333
Net charge-offs	(696)	(254)	(1,491)	(1,073)
Provision / (reversal of)	(577)	108	914	1,348
Ending Allowance for Loan Losses	4,462	5,200	4,462	5,200
Public sector finance
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	1,887	894		547
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net charge-offs	0	0	0	0
Provision / (reversal of)	(535)	216	290	563
Ending Allowance for Loan Losses	1,352	1,110	1,352	1,110
Commercial real estate
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	25,181	17,523		13,861
Charge-offs	(1,345)	(630)	(2,372)	(734)
Recoveries	17	111	117	185
Net charge-offs	(1,328)	(519)	(2,255)	(549)
Provision / (reversal of)	(648)	2,073	4,994	5,765
Ending Allowance for Loan Losses	23,205	19,077	23,205	19,077
Multi-family
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	5,028	3,463		2,741
Charge-offs	0	(399)	0	(417)
Recoveries	0	0	0	2
Net charge-offs	0	(399)	0	(415)
Provision / (reversal of)	(974)	657	(937)	1,395
Ending Allowance for Loan Losses	4,054	3,721	4,054	3,721
ADC
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	920	2,042		2,009
Charge-offs	(5)	0	(27)	0
Recoveries	0	0	269	104
Net charge-offs	(5)	0	242	104
Provision / (reversal of)	399	(298)	(859)	(369)
Ending Allowance for Loan Losses	1,314	1,744	1,314	1,744
Residential mortgage
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	5,124	4,875		5,007
Charge-offs	(389)	(338)	(668)	(771)
Recoveries	0	0	159	29
Net charge-offs	(389)	(338)	(509)	(742)
Provision / (reversal of)	319	347	(301)	619
Ending Allowance for Loan Losses	5,054	4,884	5,054	4,884
Consumer
Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method
Beginning Allowance for loan losses	3,315	3,983		4,358
Charge-offs	(156)	(259)	(687)	(1,302)
Recoveries	48	48	177	194
Net charge-offs	(108)	(211)	(510)	(1,108)
Provision / (reversal of)	309	285	120	807
Ending Allowance for Loan Losses	$ 3,516	$ 4,057	$ 3,516	$ 4,057

Allowance for Loan Losses - Nar

Allowance for Loan Losses - Narrative (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Maximum loan balance for credit risk to be evaluated on a homogeneous basis	$ 500,000
Loss
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	$ 0	$ 0

Allowance for Loan Losses - Val

Allowance for Loan Losses - Valuation Allowances Recorded Against Portfolio Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Special mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	$ 117,984	$ 104,569
Special mention | Traditional C&I
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	10,717	12,125
Special mention | Asset-based lending
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	40,312	35,373
Special mention | Payroll finance
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	14,703	0
Special mention | Factored receivables
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	270	185
Special mention | Equipment financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	10,703	2,128
Special mention | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	35,105	39,190
Special mention | Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	7,072
Special mention | ADC
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	4,204	6,899
Special mention | Residential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	978	951
Special mention | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	992	646
Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	104,205	95,152
Substandard | Traditional C&I
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	44,307	28,977
Substandard | Asset-based lending
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	0
Substandard | Payroll finance
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	1,976	820
Substandard | Factored receivables
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	433
Substandard | Equipment financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	5,204	3,397
Substandard | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	28,970	29,463
Substandard | Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	634	658
Substandard | ADC
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	4,948	8,870
Substandard | Residential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	10,958	15,796
Substandard | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	7,208	6,738
Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	795	442
Doubtful | Traditional C&I
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	794	442
Doubtful | Asset-based lending
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	0
Doubtful | Payroll finance
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	0
Doubtful | Factored receivables
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	0
Doubtful | Equipment financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	0
Doubtful | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	0
Doubtful | Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	0
Doubtful | ADC
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	0
Doubtful | Residential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	0	0
Doubtful | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans by segment	$ 1	$ 0

Goodwill and Other Intangible69

Goodwill and Other Intangible Assets - Balance of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 696,600	$ 696,600
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	59,690	66,353
Core deposits
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	32,515	37,455
Customer lists
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	6,312	7,683
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	354	625
Trade name
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	20,500	20,500
Fair value of below market leases
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	$ 9	$ 90

Goodwill and Other Intangible70

Goodwill and Other Intangible Assets - Future Amortization Expense (Details) $ in Thousands	Sep. 30, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2017	$ 2,175
2,018	7,285
2,019	6,074
2,020	5,428
2,021	5,022
2,022	4,522
Thereafter	8,684
Total	$ 39,190

Deposits - Balances (Details)

Deposits - Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deposits [Abstract]
Non-interest bearing demand	$ 3,134,359	$ 3,239,332
Interest bearing demand	2,397,172	2,220,456
Savings	807,845	747,031
Money market	4,137,702	3,277,686
Certificates of deposit	566,360	583,754
Total deposits	$ 11,043,438	$ 10,068,259

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deposits [Abstract]
Municipal deposits	$ 1,751,012	$ 1,270,921

Deposits - Brokered Deposits (D

Deposits - Brokered Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
List of Company's Brokered deposits
Brokered deposits	$ 925,131	$ 831,629
Interest bearing demand
List of Company's Brokered deposits
Brokered deposits	24,518	426,437
Savings
List of Company's Brokered deposits
Brokered deposits	0	5,560
Money market
List of Company's Brokered deposits
Brokered deposits	499,413	246,572
Money market - reciprocal brokered deposits
List of Company's Brokered deposits
Brokered deposits	142,094	153,060
CDARS and ICS one way
List of Company's Brokered deposits
Brokered deposits	$ 259,106	$ 0

Borrowings - Borrowings and Wei

Borrowings - Borrowings and Weighted Average Interest Rates (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Jul. 02, 2013
By period to maturity:
Less than one year, Amount	$ 2,621,122,000	$ 1,397,642,000
Less than one year, Rate	1.46%	0.87%
One to two years, Amount	$ 410,000,000	$ 311,469,000
One to two years, Rate	1.59%	2.53%
Two to three years, Amount	$ 200,000,000	$ 75,000,000
Two to three years, Rate	1.78%	1.50%
Three to four years, Amount	$ 50,000,000	$ 50,000,000
Three to four years, Rate	1.68%	1.38%
Four to five years, Amount	$ 0	$ 50,000,000
Four to five years, Rate	0.00%	1.68%
Greater than five years, Amount	$ 172,661,000	$ 172,501,000
Greater than five years, Rate	5.45%	5.45%
Total borrowings, Amount	$ 3,453,783,000	$ 2,056,612,000
Total borrowings, Rate	1.70%	1.56%
FHLB borrowings
By period to maturity:
Total borrowings, Amount	$ 3,016,000,000	$ 1,791,000,000
Total borrowings, Rate	1.40%	1.01%
Repurchase agreements
By period to maturity:
Total borrowings, Amount	$ 28,403,000	$ 16,642,000
Total borrowings, Rate	0.74%	0.75%
Federal funds purchased
By period to maturity:
Total borrowings, Amount	$ 160,000,000	$ 0
Total borrowings, Rate	1.31%	0.00%
Senior Notes
By period to maturity:
Total borrowings, Amount	$ 76,719,000	$ 76,469,000	$ 100,000,000
Total borrowings, Rate	5.98%	5.98%
Subordinated Notes
By period to maturity:
Total borrowings, Amount	$ 172,661,000	$ 172,501,000
Total borrowings, Rate	5.45%	5.45%

Borrowings - Narrative (Details

Borrowings - Narrative (Details) - USD ($)	Sep. 02, 2016	Mar. 29, 2016	Jul. 02, 2013	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016	Sep. 05, 2017
Debt Instrument [Line Items]
Bank pledged mortgages					$ 2,607,655,000	$ 2,050,982,000
Increased borrowing capacity by pledging securities					1,379,691,000
Long-term debt					$ 3,453,783,000	$ 2,056,612,000
Minimum
Debt Instrument [Line Items]
Repurchase agreements maturity					1 day	1 day
Maximum
Debt Instrument [Line Items]
Repurchase agreements maturity					45 days	45 days
FHLB Borrowings
Debt Instrument [Line Items]
Unused borrowing capacity					$ 1,053,356,000
Long-term debt					3,016,000,000	$ 1,791,000,000
Federal funds purchased
Debt Instrument [Line Items]
Long-term debt					160,000,000	0
Senior Notes
Debt Instrument [Line Items]
Long-term debt			$ 100,000,000		76,719,000	76,469,000
Fixed interest rate			5.50%
Private placement discount rate			1.75%
Debt issuance costs			$ 303,000
Unamortized discount				$ 531,000	$ 281,000
Interest expense cost over the life of Senior note					5.98%
Amount of debt redeemed				$ 23,000,000
Subordinated notes
Debt Instrument [Line Items]
Long-term debt					$ 172,661,000	172,501,000
Private placement discount rate	1.25%	1.25%
Debt issuance costs	$ 275,000	$ 500,000
Unamortized discount					$ 2,339,000
Principal amount	$ 65,000,000	$ 110,000,000
Interest rate		5.25%
Issue premium	0.50%
Effective yield					5.45%
Subordinated notes | Three-month LIBOR
Debt Instrument [Line Items]
Basis spread on LIBOR rates		3.937%
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving line of credit amount							$ 35,000,000
Revolving line of credit balance					$ 0	$ 0
Required balance					$ 0
Duration of minimum outstanding balance					30 days
Line of Credit | One-month LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on LIBOR rates					1.25%

Derivatives - Narrative (Detail

Derivatives - Narrative (Details) $ in Thousands	Sep. 30, 2017USD ($)
Derivative Instruments and Hedges, Assets [Abstract]
Cash paid as settled0to-market for net fair value of CME interest rate swaps	$ 2,059

Derivatives - Derivative Inform

Derivatives - Derivative Information (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Interest rate swap | Other assets
Summary of derivatives
Derivative assets, Notional amount	$ 507,011
Average maturity (in years)	5 years 11 months 23 days
Weighted average fixed rate	4.21%
Derivative assets, Fair value	$ 4,783
Interest rate swap | Other assets | One-month LIBOR
Summary of derivatives
Basis spread	2.28%
Interest rate swap | Other liabilities
Summary of derivatives
Derivative liabilities, Notional amount	$ 507,011
Average maturity (in years)	5 years 11 months 23 days
Weighted average fixed rate	4.21%
Derivative liabilities, Fair value	$ (6,842)
Interest rate swap | Other liabilities | One-month LIBOR
Summary of derivatives
Basis spread	2.28%
3rd party interest rate swap | Other assets
Summary of derivatives
Derivative assets, Notional amount	$ 154,798	$ 296,282
Average maturity (in years)		5 years 7 months 18 days
Weighted average fixed rate		3.94%
Derivative assets, Fair value	442	$ 2,088
3rd party interest rate swap | Other assets | One-month LIBOR
Summary of derivatives
Basis spread		2.29%
3rd party interest rate swap | Other liabilities
Summary of derivatives
Derivative liabilities, Notional amount	352,213
Derivative liabilities, Fair value	(2,918)
Customer interest rate swap | Other assets
Summary of derivatives
Derivative assets, Notional amount	352,213
Derivative assets, Fair value	4,341
Customer interest rate swap | Other liabilities
Summary of derivatives
Derivative liabilities, Notional amount	154,798	$ 296,282
Average maturity (in years)		5 years 7 months 18 days
Weighted average fixed rate		3.94%
Derivative liabilities, Fair value	$ (3,924)	$ (2,088)
Customer interest rate swap | Other liabilities | One-month LIBOR
Summary of derivatives
Basis spread		2.29%

Income Taxes (Details)

Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Efftective tax rate reconciliation:
Income before income tax expense	$ 66,444,000	$ 54,413,000	$ 185,939,000	$ 146,604,000
Tax at Federal statutory rate of 35%	23,253,000	19,045,000	65,076,000	51,312,000
State and local income taxes, net of Federal tax benefit	2,531,000	2,938,000	7,302,000	7,923,000
Tax exempt interest, net of disallowed interest	(5,213,000)	(3,942,000)	(12,487,000)	(7,734,000)
Bank owned life insurance income	(462,000)	(643,000)	(1,484,000)	(1,518,000)
Non-deductible acquisition related costs	237,000	0	1,193,000	0
Low income housing tax credits	(139,000)	(118,000)	(416,000)	(352,000)
Stock-based compensation benefit	(1,000)	0	(807,000)	0
Other, net	1,386,000	(289,000)	1,243,000	(1,985,000)
Actual income tax expense	$ 21,592,000	$ 16,991,000	$ 59,620,000	$ 47,646,000
Effective income tax rate	32.50%	31.20%	32.10%	32.50%
Net deferred tax asset	$ 33,569,000		$ 33,569,000		$ 40,548,000
Federal statutory rate	35.00%	35.00%	35.00%	35.00%
Valuation allowance	$ 0		$ 0		0
Unrecognized Tax Benefits	$ 0		$ 0		$ 0

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	May 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining that are authorized and available for future grant (in shares)	3,146,510		3,639,838
Grant of share options (in shares)	0	0
Exercise price (USD per share)	$ 0
Intrinsic value of options outstanding	$ 11,956
Intrinsic value of options exercisable	$ 10,748
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of contract	10 years
Weighted-average period total unrecognized compensation cost related to non-vested shares granted	1 month 10 days
Stock options | Stock Compensation Grants associated with legacy Sterling Merger
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (USD per share)	$ 14.25
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for awards	1 year
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for awards	5 years
Fully Vested legacy Sterling options | Sterling Bancorp (Legacy)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of share options (in shares)	104,152
Restricted Stock Units (RSUs) | Stock Compensation Grants associated with legacy Sterling Merger
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (USD per share)	$ 11.72
Non-vested stock awards/performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, other than options (in shares)	556,534
Weighted average grant date fair value (USD per share)	$ 24.07
Weighted-average period total unrecognized compensation cost related to non-vested shares granted	1 year 8 months 11 days
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)				2,800,000
Number of shares granted for each share received (in shares)	1
Sterling Bancorp 2013 Employment Inducement Award Plan | Sterling Bancorp (Legacy)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of share options (in shares)	95,991
Prior Plan | Restricted Stock Units (RSUs) | Sterling Bancorp (Legacy)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, other than options (in shares)	255,973

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-based Compensation Activity (Details) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Shares available for grant
Beginning balance (in shares)	3,639,838
Granted (in shares)	(556,534)
Stock awards vested (in shares)	0
Forfeited (in shares)	68,113
Canceled/expired (in shares)	(4,907)
Ending balance (in shares)	3,146,510
Non-vested stock awards/stock units outstanding - Weighted average grant date fair value
Canceled/expired (USD per share)	$ 0
Stock options outstanding - Number of shares
Beginning balance (in shares)	1,004,119
Granted (in shares)	0	0
Stock awards vested (in shares)	0
Exercised (in shares)	(118,598)
Forfeited (in shares)	(2,000)
Canceled/expired (in shares)	0
Ending balance (in shares)	883,521
Exercisable at end of period (in shares)	776,767
Stock options outstanding - Weighted average exercise price
Beginning balance (USD per share)	$ 11
Granted (USD per share)	0
Stock awards vested (USD per share)	0
Exercised (USD per share)	10.06
Forfeited (USD per share)	13.18
Canceled/expired (USD per share)	13.18
Ending balance (USD per share)	11.12
Exercisable at end of period (USD per share)	$ 10.81
Non-vested stock awards/performance units
Non-vested stock awards/stock units outstanding - Number of shares
Beginning balance (in shares)	932,223
Granted (in shares)	556,534
Stock awards vested (in shares)	(155,498)
Canceled/expired (in shares)	0
Forfeited (in shares)	(66,113)
Ending balance (in shares)	1,267,146
Non-vested stock awards/stock units outstanding - Weighted average grant date fair value
Beginning balance (USD per share)	$ 14.09
Granted (USD per share)	24.07
Stock awards vested (USD per share)	14.28
Forfeited (USD per share)	18.84
Ending balance (USD per share)	$ 19.61

Stock-Based Compensation - St81

Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,969	$ 1,674	$ 5,602	$ 4,960
Stock-based compensation expense, income tax benefit	640	557	1,821	1,652
Proceeds from stock option exercises	65	2,278	1,193	3,703
Unrecognized stock-based compensation, stock options	12		12
Unrecognized stock-based compensation, non-vested stock awards/performance units	14,894		14,894
Total unrecognized stock-based compensation expense	14,906		14,906
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	48	95	146	345
Non-vested stock awards/performance units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,921	$ 1,579	$ 5,456	$ 4,615

Other Post-Retirement Plans - N

Other Post-Retirement Plans - Net Pension and Post-retirement Expense (Details) - Other Post-Retirement Benefit Plans - United States Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	101	104	302	313
Net amortization and deferral	8	16	26	48
Total other post-retirement expense	$ 109	$ 120	$ 328	$ 361

Other Post-Retirement Plans -83

Other Post-Retirement Plans - Narrative (Details) - Other Post-Retirement Benefit Plans - United States Plan - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to fund SERP	$ 109	$ 77
Other liabilities
Defined Benefit Plan Disclosure [Line Items]
Total post retirement plan liabilities	$ 12,344		$ 12,125

Other Non-interest Expense (Det

Other Non-interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Income and Expenses [Abstract]
Advertising and promotion	$ 649	$ 737	$ 2,034	$ 2,273
Professional fees	2,234	2,604	6,917	7,684
Data and check processing	2,512	2,402	7,402	6,417
Insurance & surety bond premium	841	821	2,065	2,503
Other	3,917	4,371	12,735	14,453
Total other non-interest expense	$ 10,153	$ 10,935	$ 31,153	$ 33,330

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 44,852	$ 37,422	$ 126,319	$ 98,958
Weighted average common shares outstanding for computation of basic EPS	135,346,791	130,239,193	135,276,634	130,049,358
Common-equivalent shares due to the dilutive effect of stock options and unvested performance share grants	603,369	636,421	618,879	596,347
Weighted average common shares for computation of diluted EPS	135,950,160	130,875,614	135,895,513	130,645,705
Earnings per common share:
Basic (loss) earnings per common share (USD per share)	$ 0.33	$ 0.29	$ 0.93	$ 0.76
Diluted (loss) earnings per common share (USD per share)	$ 0.33	$ 0.29	$ 0.93	$ 0.76
Weighted average common shares that could be exercised that were anti-dilutive for the period	0	0	0	0

Stockholders' Equity - Complian

Stockholders' Equity - Compliance with Regulatory Capital Requirements (Schedule) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Sterling National Bank
Common equity tier 1 to RWA:
Tier 1 common equity, Actual, Capital amount	$ 1,276,461	$ 1,176,497
Tier 1 common equity, Actual, Ratio	10.41%	10.87%
Tier 1 common equity required for minimum capital adequacy, phase-in schedule, Capital amount	$ 704,960	$ 554,663
Tier 1 common equity required for minimum capital adequacy, phase-in schedule, Ratio	5.75%	5.125%
Tier 1 common equity required for minimum capital adequacy, fully phased-in, Capital amount	$ 858,212	$ 757,588
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	$ 796,911	$ 703,475
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	$ 1,276,461	$ 1,176,497
Tier 1 risk-based capital, Ratio	10.41%	10.87%
Tier 1 risk-based capital required for minimum capital adequacy, phase-in schedule, Capital amount	$ 888,862	$ 717,003
Tier 1 risk-based capital required for minimum capital adequacy, phase-in schedule, Ratio	7.25%	6.625%
Tier 1 risk-based capital required for minimum capital adequacy, fully phased-in, Capital amount	$ 1,042,114	$ 919,928
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	$ 980,813	$ 865,815
Tier 1 risk-based capital required to be well capitalized, Ratio	8.00%	8.00%
Total capital to RWA:
Total risk-based capital, Actual, Capital amount	$ 1,521,795	$ 1,413,165
Total risk-based capital, Ratio	12.41%	13.06%
Total risk-based capital required for minimum capital adequacy, phase-in schedule, Capital amount	$ 1,134,065	$ 933,457
Total risk-based capital required for minimum capital adequacy, phase-in schedule, Ratio	9.25%	8.625%
Total risk-based capital required for minimum capital adequacy, fully phased-in, Capital amount	$ 1,287,317	$ 1,136,382
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	$ 1,226,017	$ 1,082,269
Total risk-based capital required to be well capitalized, Ratio	10.00%	10.00%
Tier 1 leverage ratio:
Tier 1 (core) capital, Actual, Capital amount	$ 1,276,461	$ 1,176,497
Tier 1 (core) capital, Ratio	8.54%	9.08%
Tier 1 (core) capital required for minimum capital adequacy, phase-in schedule, Capital amount	$ 597,687	$ 518,308
Tier 1 (core) capital required for minimum capital adequacy, phase-in schedule, Ratio	4.00%	4.00%
Tier 1 (core) capital required for minimum capital adequacy, fully phased-in, Capital amount	$ 597,687	$ 518,308
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	$ 747,109	$ 647,885
Tier 1 (core) capital required to be well capitalized, Ratio	5.00%	5.00%
Sterling Bancorp
Common equity tier 1 to RWA:
Tier 1 common equity, Actual, Capital amount	$ 1,259,416	$ 1,160,739
Tier 1 common equity, Actual, Ratio	10.27%	10.73%
Tier 1 common equity required for minimum capital adequacy, phase-in schedule, Capital amount	$ 704,787	$ 554,474
Tier 1 common equity required for minimum capital adequacy, phase-in schedule, Ratio	5.75%	5.125%
Tier 1 common equity required for minimum capital adequacy, fully phased-in, Capital amount	$ 858,002	$ 757,330
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	$ 1,259,416	$ 1,160,739
Tier 1 risk-based capital, Ratio	10.27%	10.73%
Tier 1 risk-based capital required for minimum capital adequacy, phase-in schedule, Capital amount	$ 888,645	$ 716,759
Tier 1 risk-based capital required for minimum capital adequacy, phase-in schedule, Ratio	7.25%	6.625%
Tier 1 risk-based capital required for minimum capital adequacy, fully phased-in, Capital amount	$ 1,041,859	$ 919,615
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	$ 1,488,787	$ 1,377,547
Total risk-based capital, Ratio	12.15%	12.73%
Total risk-based capital required for minimum capital adequacy, phase-in schedule, Capital amount	$ 1,133,788	$ 933,139
Total risk-based capital required for minimum capital adequacy, phase-in schedule, Ratio	9.25%	8.625%
Total risk-based capital required for minimum capital adequacy, fully phased-in, Capital amount	$ 1,287,002	$ 1,135,995
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	$ 1,259,416	$ 1,160,739
Tier 1 (core) capital, Ratio	8.42%	8.95%
Tier 1 (core) capital required for minimum capital adequacy, phase-in schedule, Capital amount	$ 598,037	$ 518,733
Tier 1 (core) capital required for minimum capital adequacy, phase-in schedule, Ratio	4.00%	4.00%
Tier 1 (core) capital required for minimum capital adequacy, fully phased-in, Capital amount	$ 598,037	$ 518,733
Tier 1 (core) capital required for minimum capital adequacy, fully phased-in, Ratio	4.00%	4.00%

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 22, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Class of Stock [Line Items]
Aggregate dividend capacity without prior regulatory approval		$ 221,000
Capital raise, shares	4,370,000
Capital raise, price per share (USD per share)	$ 20.95
Total proceeds from public offering	$ 92,863
Net proceeds from public offering	$ 90,995
Shares available for repurchase program		776,713
Sterling Bancorp
Class of Stock [Line Items]
Tier 1 (core) capital required for minimum capital adequacy, fully phased-in, Capital amount		$ 598,037		$ 518,733
Tier 2 capital		$ 156,699
Shares repurchased under repurchase program		0	0
Sterling National Bank
Class of Stock [Line Items]
Liquidation account		$ 13,300
Subordinated notes | Sterling National Bank
Class of Stock [Line Items]
Tier 2 capital		$ 172,661

Commitments and Contingencies88

Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Rent expense	$ 1,874	$ 2,394	$ 6,263	$ 8,115
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Remainder of 2017	2,478		2,478
2,018	9,616		9,616
2,019	8,513		8,513
2,020	7,607		7,607
2,021	6,168		6,168
2,022	5,039		5,039
2023 and thereafter	15,716		15,716
Total future minimum payments	55,137		55,137
Loan origination commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Lending-related instruments	252,197		252,197		$ 245,319
Unused lines of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Lending-related instruments	1,025,171		1,025,171		968,288
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Lending-related instruments	$ 131,611		$ 131,611		$ 114,582

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other securities:
Securities available for sale	$ 2,579,076	$ 1,727,417
Level 1 inputs
Other securities:
Securities available for sale	0	0
Swaps	0	0
Swaps	0	0
Level 2 inputs
Other securities:
Securities available for sale	2,579,076	1,727,417
Swaps	4,783	2,088
Swaps	6,842	2,088
Level 3 inputs
Other securities:
Securities available for sale	0	0
Swaps	0	0
Swaps	0	0
Fair Value, Measurements, Recurring
Residential MBS:
Mortgage-backed securities-residential	1,936,018	1,250,162
Other securities:
Total investment securities available for sale	643,058	477,255
Securities available for sale	2,579,076	1,727,417
Swaps	4,783	2,088
Total assets	2,583,859	1,729,505
Swaps	(6,842)	(2,088)
Total liabilities	(6,842)	(2,088)
Fair Value, Measurements, Recurring | Agency-backed
Residential MBS:
Mortgage-backed securities-residential	1,869,967	1,193,481
Fair Value, Measurements, Recurring | CMOs/Other MBS
Residential MBS:
Mortgage-backed securities-residential	66,051	56,681
Fair Value, Measurements, Recurring | Federal agencies
Other securities:
Total investment securities available for sale	225,757	193,979
Fair Value, Measurements, Recurring | Corporate bonds
Other securities:
Total investment securities available for sale	120,044	42,506
Fair Value, Measurements, Recurring | State and municipal
Other securities:
Total investment securities available for sale	297,257	240,770
Fair Value, Measurements, Recurring | Level 1 inputs
Residential MBS:
Mortgage-backed securities-residential	0	0
Other securities:
Total investment securities available for sale	0	0
Securities available for sale	0	0
Swaps	0	0
Total assets	0	0
Swaps	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 inputs | Agency-backed
Residential MBS:
Mortgage-backed securities-residential	0	0
Fair Value, Measurements, Recurring | Level 1 inputs | CMOs/Other MBS
Residential MBS:
Mortgage-backed securities-residential	0	0
Fair Value, Measurements, Recurring | Level 1 inputs | Federal agencies
Other securities:
Total investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Level 1 inputs | Corporate bonds
Other securities:
Total investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Level 1 inputs | State and municipal
Other securities:
Total investment securities available for sale
Fair Value, Measurements, Recurring | Level 2 inputs
Residential MBS:
Mortgage-backed securities-residential	1,936,018	1,250,162
Other securities:
Total investment securities available for sale	643,058	477,255
Securities available for sale	2,579,076	1,727,417
Swaps	4,783	2,088
Total assets	2,583,859	1,729,505
Swaps	(6,842)	(2,088)
Total liabilities	(6,842)	(2,088)
Fair Value, Measurements, Recurring | Level 2 inputs | Agency-backed
Residential MBS:
Mortgage-backed securities-residential	1,869,967	1,193,481
Fair Value, Measurements, Recurring | Level 2 inputs | CMOs/Other MBS
Residential MBS:
Mortgage-backed securities-residential	66,051	56,681
Fair Value, Measurements, Recurring | Level 2 inputs | Federal agencies
Other securities:
Total investment securities available for sale	225,757	193,979
Fair Value, Measurements, Recurring | Level 2 inputs | Corporate bonds
Other securities:
Total investment securities available for sale	120,044	42,506
Fair Value, Measurements, Recurring | Level 2 inputs | State and municipal
Other securities:
Total investment securities available for sale	297,257	240,770
Fair Value, Measurements, Recurring | Level 3 inputs
Residential MBS:
Mortgage-backed securities-residential	0	0
Other securities:
Total investment securities available for sale	0	0
Securities available for sale	0	0
Swaps	0	0
Total assets	0	0
Swaps	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 inputs | Agency-backed
Residential MBS:
Mortgage-backed securities-residential	0	0
Fair Value, Measurements, Recurring | Level 3 inputs | CMOs/Other MBS
Residential MBS:
Mortgage-backed securities-residential	0	0
Fair Value, Measurements, Recurring | Level 3 inputs | Federal agencies
Other securities:
Total investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Level 3 inputs | Corporate bonds
Other securities:
Total investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Level 3 inputs | State and municipal
Other securities:
Total investment securities available for sale	$ 0	$ 0

Fair Value Measurements - Impai

Fair Value Measurements - Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	$ 0	$ 0
Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	0	0
Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	10,369,659	9,461,469
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	4,376	6,786
Fair Value, Measurements, Nonrecurring | C&I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	177
Fair Value, Measurements, Nonrecurring | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	3,278	6,786
Fair Value, Measurements, Nonrecurring | Residential mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	921
Fair Value, Measurements, Nonrecurring | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	0	0
Fair Value, Measurements, Nonrecurring | Level 1 inputs | C&I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	0
Fair Value, Measurements, Nonrecurring | Level 1 inputs | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	0	0
Fair Value, Measurements, Nonrecurring | Level 1 inputs | Residential mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	0
Fair Value, Measurements, Nonrecurring | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	0	0
Fair Value, Measurements, Nonrecurring | Level 2 inputs | C&I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	0
Fair Value, Measurements, Nonrecurring | Level 2 inputs | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	0	0
Fair Value, Measurements, Nonrecurring | Level 2 inputs | Residential mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	0
Fair Value, Measurements, Nonrecurring | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	4,376	6,786
Fair Value, Measurements, Nonrecurring | Level 3 inputs | C&I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	177
Fair Value, Measurements, Nonrecurring | Level 3 inputs | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	3,278	$ 6,786
Fair Value, Measurements, Nonrecurring | Level 3 inputs | Residential mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impaired loans measured at fair value	$ 921

Fair Value Measurements - Sum91

Fair Value Measurements - Summary of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	$ 2,579,076	$ 1,727,417
Securities held to maturity	1,932,755	1,357,997
Senior Notes	(76,719)	(76,469)
Subordinated Notes	(172,661)	(172,501)
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	407,203	293,646
Securities available for sale	2,579,076	1,727,417
Securities held to maturity	1,936,574	1,391,421
Loans held for sale		41,889
Portfolio loans, net	10,421,407	9,463,608
Accrued interest receivable on securities	26,283	16,495
Accrued interest receivable on loans	31,278	26,824
FHLB stock and FRB stock	191,276	135,098
Swaps	4,783	2,088
Non-maturity deposits	(10,477,078)	(9,484,505)
Certificates of deposit	(566,360)	(583,754)
FHLB borrowings	(3,016,000)	(1,791,000)
Other borrowings	(188,403)	(16,642)
Senior Notes	(76,719)	(76,469)
Subordinated Notes	(172,661)	(172,501)
Mortgage escrow funds	(19,148)	(13,572)
Accrued interest payable on deposits	(812)	(663)
Accrued interest payable on borrowings	(9,949)	(3,621)
Swaps	(6,842)	(2,088)
Level 1 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	407,203	293,646
Securities available for sale	0	0
Securities held to maturity	0	0
Loans held for sale		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
Non-maturity deposits	(10,477,078)	(9,484,505)
Certificates of deposit	0	0
FHLB borrowings	0	0
Other borrowings	0	0
Senior Notes	0	0
Subordinated Notes	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 2 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Securities available for sale	2,579,076	1,727,417
Securities held to maturity	1,932,755	1,357,997
Loans held for sale		41,889
Portfolio loans, net	0	0
Accrued interest receivable on securities	26,283	16,495
Accrued interest receivable on loans	0	0
FHLB stock and FRB stock	0	0
Swaps	4,783	2,088
Non-maturity deposits	0	0
Certificates of deposit	(564,517)	(582,811)
FHLB borrowings	(3,043,454)	(1,788,676)
Other borrowings	(188,402)	(16,642)
Senior Notes	(78,987)	(79,283)
Subordinated Notes	(183,589)	(169,813)
Mortgage escrow funds	(19,148)	(13,572)
Accrued interest payable on deposits	(812)	(663)
Accrued interest payable on borrowings	(9,949)	(3,621)
Swaps	(6,842)	(2,088)
Level 3 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Securities available for sale	0	0
Securities held to maturity	0	0
Loans held for sale		0
Portfolio loans, net	10,369,659	9,461,469
Accrued interest receivable on securities	0	0
Accrued interest receivable on loans	31,278	26,824
FHLB stock and FRB stock	0	0
Swaps	0	0
Non-maturity deposits	0	0
Certificates of deposit	0	0
FHLB borrowings	0	0
Other borrowings	0	0
Senior Notes	0	0
Subordinated Notes	0	0
Mortgage escrow funds	0	0
Accrued interest payable on deposits	0	0
Accrued interest payable on borrowings	0	0
Swaps	$ 0	$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum loan balance for credit risk to be evaluated on a homogeneous basis	$ 500,000
Changes in fair value recognized on provisions on loans held by the Company	542,000	$ 314,000
Mortgage servicing rights	$ 999,000		$ 1,024,000
Percentage appraisals discounted	22.00%		22.00%
Assets taken in foreclosure, defaulted loans and facilities held for sale	$ 11,697,000		$ 13,619,000
Changes in fair value recognized through income for foreclosed assets held by the Company	$ 1,737,000	$ 582,000
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Prepayment speed	1.00%		1.00%
Market discount rate	9.25%		8.50%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Prepayment speed	4.32%		5.55%
Market discount rate	12.25%		11.50%
Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Prepayment speed	1.87%		1.74%
Market discount rate	10.57%		9.73%
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio loans, net	$ 55,422,000		$ 55,391,000
Commercial loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum loan balance for credit risk to be evaluated on a homogeneous basis	250,000
Residential loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum loan balance for credit risk to be evaluated on a homogeneous basis	$ 500,000

Accumulated Other Comprehensi93

Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	$ 4,478	$ (5,021)	$ 21,448	$ 33,689
Other comprehensive income (loss), tax benefit	(1,769)	1,984	(8,472)	(13,672)
Other comprehensive income (loss), net of tax	2,709	(3,037)	12,976	20,017
Total stockholders’ equity	1,971,480	1,765,160	1,971,480	1,765,160	$ 1,855,183			$ 1,665,073
Net unrealized holding (loss) gain on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total stockholders’ equity	(10,145)	12,037	(10,145)	12,037	(22,637)	$ (12,704)	$ 15,391	(6,999)
Net unrealized holding (loss) gain on available for sale securities | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax			(16,768)		(37,417)
Other comprehensive income (loss), tax benefit			6,623		14,780
Other comprehensive income (loss), net of tax			(10,145)		(22,637)
Net unrealized holding (loss) gain on available for sale securities | Held-to-maturity securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax			(4,670)		(5,395)
Other comprehensive income (loss), tax benefit			1,845		2,131
Other comprehensive income (loss), net of tax			(2,825)		(3,264)
Net unrealized holding (loss) gain on retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax			(1,139)		(1,213)
Other comprehensive income (loss), tax benefit			450		479
Other comprehensive income (loss), net of tax			(689)		(734)
Total stockholders’ equity	(689)	(741)	(689)	(741)	(734)	(695)	(730)	(970)
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), net of tax			12,976	20,017
Total stockholders’ equity	$ (13,659)	$ 7,893	$ (13,659)	$ 7,893	$ (26,635)	$ (16,368)	$ 10,930	$ (12,124)

Accumulated Other Comprehensi94

Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance			$ 1,855,183	$ 1,665,073
Other comprehensive gain (loss) before reclassification	$ 2,538	$ (1,278)	12,218	23,649
Amounts reclassified from AOCI	171	(1,759)	758	(3,632)
Total other comprehensive income	2,709	(3,037)	12,976	20,017
Balance	1,971,480	1,765,160	1,971,480	1,765,160
Net unrealized holding (loss) gain on available for sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(12,704)	15,391	(22,637)	(6,999)
Other comprehensive gain (loss) before reclassification	2,538	(1,278)	12,218	23,649
Amounts reclassified from AOCI	21	(2,076)	274	(4,613)
Total other comprehensive income	2,559	(3,354)	12,492	19,036
Balance	(10,145)	12,037	(10,145)	12,037
Net unrealized holding (loss)gain on securities transferred to held to maturity
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(2,969)	(3,731)	(3,264)	(4,155)
Other comprehensive gain (loss) before reclassification	0	0	0	0
Amounts reclassified from AOCI	144	328	439	752
Total other comprehensive income	144	328	439	752
Balance	(2,825)	(3,403)	(2,825)	(3,403)
Net unrealized holding (loss) gain on retirement plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(695)	(730)	(734)	(970)
Other comprehensive gain (loss) before reclassification	0	0	0	0
Amounts reclassified from AOCI	6	(11)	45	229
Total other comprehensive income	6	(11)	45	229
Balance	(689)	(741)	(689)	(741)
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(16,368)	10,930	(26,635)	(12,124)
Balance	$ (13,659)	$ 7,893	$ (13,659)	$ 7,893

Merger with Astoria Financial95

Merger with Astoria Financial Corporation - Narrative (Details) $ / shares in Units, $ in Thousands, shares in Millions	Oct. 02, 2017USD ($)$ / sharesshares	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Business Acquisition [Line Items]
Merger agreement, value of stock-for-stock transaction		$ 0	$ 351,452
Subsequent Event | Astoria Financial Corporation
Business Acquisition [Line Items]
Merger agreement, value of stock-for-stock transaction	$ 2,189,687
Merger agreement, fractional shares	$ 33
Number of shares received by Astoria shareholders for each share of acquiree's stock	0.875
Upon closing, percentage of stock owned by Sterling shareholders	60.50%
Upon closing, percentage of stock owned by Astoria shareholders	39.50%
Depositary shares issued in connection with merger | shares	5.4
Subsequent Event | Astoria Financial Corporation | Non-cumulative Perpetual Preferred Stock, Series A
Business Acquisition [Line Items]
Conversion rate of depositary shares to preferred stock in connection with merger	0.025
Preferred stock dividend rate	6.50%
Price per share of depositary shares received and issued in connection with merger | $ / shares	$ 25
Subsequent Event | Astoria Financial Corporation | Non-cumulative Perpetual Preferred Stock Series C
Business Acquisition [Line Items]
Conversion rate of depositary shares to preferred stock in connection with merger	0.025
Price per share of depositary shares received and issued in connection with merger | $ / shares	$ 25
Subsequent Event | Astoria Financial Corporation | Non-cumulative Perpetual Preferred Stock Series C | Astoria Financial Corporation
Business Acquisition [Line Items]
Preferred stock dividend rate	6.50%

Merger with Astoria Financial96

Merger with Astoria Financial Corporation - Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Pro Forma Condensed Income Statement Information:
Net interest income	$ 120,073	$ 103,130	$ 342,121	$ 297,020
Provisions for loan losses	5,000	5,500	14,000	14,500
Income before income taxes	66,444	54,413	185,939	146,604
Net income	44,852	37,422	126,319	98,958
Pro Forma Condensed Combined Balance Sheet Information:
Portfolio loans, net	10,421,407		10,421,407		$ 9,463,608
Total assets	16,780,097		16,780,097		14,178,447
Deposits	11,043,438		11,043,438		10,068,259
Total stockholders’ equity	$ 1,971,480	$ 1,765,160	$ 1,971,480	$ 1,765,160	1,855,183	$ 1,665,073
Astoria Financial Corporation | Pro Forma Statement Information
Pro Forma Condensed Income Statement Information:
Net interest income					818,907
Provisions for loan losses					10,849
Income before income taxes					385,185
Net income					251,173
Pro Forma Condensed Combined Balance Sheet Information:
Portfolio loans, net					19,530,795
Total assets					29,510,290
Deposits					18,956,004
Total stockholders’ equity					$ 4,218,852