Investors Bancorp (ISBC) 10-Q 10 May 16 2016 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 02, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	Investors Bancorp, Inc.
Entity Central Index Key	1,594,012
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		319,090,253

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 143,669	$ 148,904
Securities available-for-sale, at estimated fair value	1,311,532	1,304,697
Securities held-to-maturity, net (estimated fair value of $1,954,346 and $1,888,686 at March 31, 2016 and December 31, 2015, respectively)	1,887,000	1,844,223
Loans receivable, net	16,922,727	16,661,133
Loans held-for-sale	3,852	7,431
Stock in the Federal Home Loan Bank	190,240	178,437
Accrued interest receivable	63,678	58,563
Other real estate owned	4,431	6,283
Office properties and equipment, net	173,609	172,519
Net deferred tax asset	219,458	237,367
Bank owned life insurance	159,184	159,152
Goodwill and intangible assets	104,960	105,311
Other assets	5,630	4,664
Total assets	21,189,970	20,888,684
Liabilities:
Deposits	14,201,387	14,063,656
Borrowed funds	3,527,630	3,263,090
Advance payments by borrowers for taxes and insurance	126,180	108,721
Other liabilities	119,046	141,570
Total liabilities	$ 17,974,243	$ 17,577,037
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value, 100,000,000 authorized shares; none issued	$ 0	$ 0
Common stock, $0.01 par value, 1,000,000,000 shares authorized; 359,070,852 issued at March 31, 2016 and December 31, 2015; 323,385,503 and 334,894,181 outstanding at March 31, 2016 and December 31, 2015, respectively	3,591	3,591
Additional paid-in capital	2,785,702	2,785,503
Retained earnings	959,790	936,040
Treasury stock, at cost; 35,685,349 and 24,176,671 shares at March 31, 2016 and December 31, 2015, respectively	(425,991)	(295,412)
Unallocated common stock held by the employee stock ownership plan	(89,501)	(90,250)
Accumulated other comprehensive loss	(17,864)	(27,825)
Total stockholders’ equity	3,215,727	3,311,647
Total liabilities and stockholders’ equity	$ 21,189,970	$ 20,888,684

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Estimated fair value	$ 1,954,346	$ 1,888,686
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	359,070,852	359,070,852
Common stock, shares outstanding	323,385,503	334,894,181
Treasury stock, shares	35,685,349	24,176,671

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest and dividend income:
Loans receivable and loans held-for-sale	$ 172,832	$ 159,052
Securities:
Equity	51	24
Government-sponsored enterprise obligations	11	11
Mortgage-backed securities	15,097	12,817
Municipal bonds and other debt	1,952	1,592
Interest-bearing deposits	104	29
Federal Home Loan Bank stock	2,060	1,634
Total interest and dividend income	192,107	175,159
Interest expense:
Deposits	20,725	16,019
Borrowed Funds	16,819	14,699
Total interest expense	37,544	30,718
Net interest income	154,563	144,441
Provision for loan losses	5,000	9,000
Net interest income after provision for loan losses	149,563	135,441
Non-interest income
Fees and service charges	4,180	4,024
Income on bank owned life insurance	1,260	1,037
Gain on loans, net	437	1,219
Gain on securities transactions, net	1,388	42
(Loss) gain on sale of other real estate owned, net	(233)	72
Other income	1,675	2,139
Total non-interest income	8,707	8,533
Non-interest expense
Compensation and fringe benefits	51,817	43,332
Advertising and promotional expense	1,694	2,535
Office occupancy and equipment expense	13,810	12,546
Federal deposit insurance premiums	2,400	2,200
Stationery, printing, supplies and telephone	817	851
Professional fees	4,013	3,271
Data processing service fees	5,561	5,450
Other operating expenses	7,034	6,723
Total non-interest expenses	87,146	76,908
Income before income tax expense	71,124	67,066
Income tax expense	27,498	25,119
Net income	$ 43,626	$ 41,947
Basic and diluted earnings per share (usd per share)	$ 0.14	$ 0.12
Weighted average shares outstanding
Basic (shares)	309,166,680	344,237,371
Diluted (shares)	312,154,256	347,470,957

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 43,626	$ 41,947
Other comprehensive income, net of tax:
Change in funded status of retirement obligations	317	208
Unrealized gain on securities available-for-sale	10,002	5,093
Accretion of loss on securities reclassified to held to maturity	284	379
Reclassification adjustment for security gains included in net income	(833)	0
Other-than-temporary impairment accretion on debt securities	191	196
Total other comprehensive income (loss)	9,961	5,876
Total comprehensive income	$ 53,587	$ 47,823

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Treasury stock	Unallocated common stock held by ESOP	Accumulated other comprehensive loss
Balance at Dec. 31, 2014	$ 3,577,855	$ 3,591	$ 2,864,406	$ 836,639	$ (11,131)	$ (93,246)	$ (22,404)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	41,947			41,947
Other comprehensive income, net of tax	5,876						5,876
Purchase of treasury stock	(34,709)				(34,709)
Compensation cost for stock options and restricted stock	4		4
Net tax benefit from stock-based compensation	267		267
Option exercise	1,251	0	(1,098)		2,349
Cash dividend paid	(35,814)			(35,814)
ESOP shares allocated or committed to be released	1,343		594			749
Balance at Mar. 31, 2015	3,558,020	3,591	2,864,173	842,772	(43,491)	(92,497)	(16,528)
Balance at Dec. 31, 2015	3,311,647	3,591	2,785,503	936,040	(295,412)	(90,250)	(27,825)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	43,626			43,626
Other comprehensive income, net of tax	9,961						9,961
Purchase of treasury stock	(140,192)				(140,192)
Purchase of treasury stock	0		(1,865)	(71)	1,936
Compensation cost for stock options and restricted stock	4,333		4,333
Net tax benefit from stock-based compensation	957		957
Option exercise	3,835	0	(3,842)		7,677
Cash dividend paid	(19,805)			(19,805)
ESOP shares allocated or committed to be released	1,365		616			749
Balance at Mar. 31, 2016	$ 3,215,727	$ 3,591	$ 2,785,702	$ 959,790	$ (425,991)	$ (89,501)	$ (17,864)

Consolidated Statements of Sto7

Consolidated Statements of Stockholders' Equity (Parenthetical)	3 Months Ended
	Mar. 31, 2016$ / sharesshares
Statement of Stockholders' Equity [Abstract]
Purchase of treasury stock (shares)	12,150,000
Dividends paid per share (usd per share) | $ / shares	$ 0.06
Treasury stock allocated to restricted stock plan (shares)	161,890

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 43,626	$ 41,947
Adjustments to reconcile net income to net cash provided by operating activities:
ESOP and stock-based compensation expense	5,698	1,347
Amortization of premiums and accretion of discounts on securities, net	3,203	3,406
Amortization of premiums and accretion of fees and costs on loans, net	(624)	(1,000)
Amortization of intangible assets	740	857
Provision for loan losses	5,000	9,000
Depreciation and amortization of office properties and equipment	3,756	2,800
Gain on securities, net	(1,388)	(42)
Mortgage loans originated for sale	(29,956)	(59,818)
Proceeds from mortgage loan sales	34,039	57,974
Gain on sales of mortgage loans, net	(504)	(1,043)
Loss (gain) on sale of other real estate owned	233	(72)
Income on bank owned life insurance	(1,260)	(1,037)
Increase in accrued interest receivable	(5,115)	(2,709)
Deferred tax expense	11,422	1,656
(Increase) decrease in other assets	(1,335)	4,881
(Decrease) increase in other liabilities	(21,227)	8,667
Total adjustments	2,682	24,867
Net cash provided by operating activities	46,308	66,814
Cash flows from investing activities:
Purchases of loans receivable	(9,419)	(21,248)
Net originations of loans receivable	(257,211)	(502,771)
Proceeds from sale of loans held for investment	0	176
Loss (gain) on disposition of loans held for investment	67	(176)
Net proceeds from sale of foreclosed real estate	2,190	881
Purchases of mortgage-backed securities held to maturity	(113,788)	(91,982)
Purchases of debt securities held-to-maturity	(7,532)	(6,659)
Purchases of mortgage-backed securities available-for-sale	(86,938)	(78,399)
Purchases of equity securities available-for-sale	(25)	0
Proceeds from paydowns/maturities on mortgage-backed securities held-to-maturity	64,079	49,842
Proceeds from paydowns/maturities on debt securities held-to-maturity	12,034	15,646
Proceeds from paydowns/maturities on mortgage-backed securities available-for-sale	61,590	52,810
Proceeds from sales of mortgage-backed securities available-for-sale	33,059	0
Proceeds from paydowns/ maturities of US Government and Agency Obligations held-to-maturity	2,007	0
Redemption of equity securities available-for-sale	0	122
Proceeds from redemptions of Federal Home Loan Bank stock	33,609	43,541
Purchases of Federal Home Loan Bank stock	(45,412)	(61,436)
Purchases of office properties and equipment	(4,846)	(6,538)
Death benefit proceeds from bank owned life insurance	468	3,205
Net cash used in investing activities	(316,068)	(602,986)
Cash flows from financing activities:
Net increase in deposits	137,731	184,534
Net increase in other borrowings	264,540	395,509
Net increase in advance payments by borrowers for taxes and insurance	17,459	23,247
Dividends paid	(19,805)	(35,814)
Exercise of stock options	3,835	1,251
Purchase of treasury stock	(140,192)	(34,709)
Net tax benefit from stock-based compensation	957	267
Net cash provided by financing activities	264,525	534,285
Net decrease in cash and cash equivalents	(5,235)	(1,887)
Cash and cash equivalents at beginning of period	148,904	230,961
Cash and cash equivalents at beginning of period	143,669	229,074
Non-cash investing activities:
Real estate acquired through foreclosure	591	2,024
Cash paid during the year for:
Interest	37,884	30,639
Income taxes	$ 31,184	$ 27,477

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Investors Bancorp, Inc. (the “Company”) is a Delaware corporation that was incorporated in December 2013 to be the successor to Investors Bancorp, Inc. (“Old Investors Bancorp”) upon completion of the mutual-to-stock conversion of Investors Bancorp, MHC, the top tier holding company of Old Investors Bancorp. Old Investors Bancorp was the former mid tier holding company for Investors Bank. Prior to completion of the second step conversion, approximately 62% of the shares of common stock of Old Investors Bancorp was owned by Investors Bancorp, MHC. In conjunction with the second step conversion, Investors Bancorp, MHC merged into Old Investors Bancorp (and ceased to exist), and Old Investors Bancorp merged into the Company and the Company became its successor under the name Investors Bancorp, Inc. The second step conversion was completed May 7, 2014. The Company raised net proceeds of $2.15 billion by selling a total of 219,580,695 shares of common stock at $10.00 per share in the second step stock offering and issued 1,000,000 shares of common stock to the Investors Charitable Foundation. Concurrent with the completion of the stock offering, each share of Old Investors Bancorp common stock owned by public stockholders (stockholders other than Investors Bancorp, MHC) was exchanged for 2.55 shares of Company common stock. As such, all share information prior to May 7, 2014 has been adjusted to reflect the ratio. A total of 137,560,968 shares of Company common stock were issued in the exchange. The conversion was accounted for as a capital raising transaction by entities under common control. The historical financial results of Investors Bancorp, MHC were immaterial to the results of the Company and therefore upon completion of the conversion, the net assets of Investors Bancorp, MHC were merged into the Company and are reflected as an increase to stockholders' equity. In addition, the second step conversion resulted in the accelerated vesting of all outstanding stock awards as of the conversion date. The withholding of shares for payment of taxes with respect to these awards resulted in treasury stock of 1,101,694 shares. In the opinion of management, all the adjustments (consisting of normal and recurring adjustments) necessary for the fair presentation of the consolidated financial condition and the consolidated results of operations for the unaudited periods presented have been included. The results of operations and other data presented for the three months ended March 31, 2016 are not necessarily indicative of the results of operations that may be expected for subsequent periods or the full year results. Certain information and note disclosures usually included in financial statements prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for the preparation of the Form 10-Q. The consolidated financial statements presented should be read in conjunction with the Company’s audited consolidated financial statements and notes to the audited consolidated financial statements included in the Company’s December 31, 2015 Annual Report on Form 10-K. Certain reclassifications have been made to prior year amounts to conform to current year presentation.

Stock Transactions

Stock Transactions	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Stock Transactions	Stock Transactions Stock Repurchase Programs In connection with the second step conversion completed on May 7, 2014, the existing stock repurchase plan was terminated. Under applicable federal regulations, the Company was not permitted to implement a stock repurchase program during the first year following completion of the second-step conversion without prior notice to, and the receipt of a non-objection from the Federal Reserve Board. On March 16, 2015, the Company announced it had received approval from the Board of Governors of the Federal Reserve System to commence a 5% buyback program prior to the one-year anniversary of the completion of its second step conversion. Accordingly, the Board of Directors authorized the repurchase of 17,911,561 shares. On June 9, 2015, the Company announced its second share repurchase program, which authorized the purchase of an additional 10% of its publicly-held outstanding shares of common stock, or 34,779,211 shares. The second repurchase program commenced immediately upon completion of the first repurchase plan on June 30, 2015. During the three months ended March 31, 2016 , the Company purchased 12,150,000 shares at a cost of $140.2 million , or approximately $11.54 per share.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following is a summary of our earnings per share calculations and reconciliation of basic to diluted earnings per share. For the Three Months Ended March 31, 2016 2015 Income Shares Per Share Amount Income Shares Per Share Amount (Dollars in thousands, except per share data) Net Income $ 43,626 $ 41,947 Basic earnings per share: Income available to common stockholders $ 43,626 309,166,680 $ 0.14 $ 41,947 344,237,371 $ 0.12 Effect of dilutive common stock equivalents (1) 2,987,576 3,233,586 Diluted earnings per share: Income available to common stockholders $ 43,626 312,154,256 $ 0.14 $ 41,947 347,470,957 $ 0.12 (1) For the three months ended March 31, 2016 and 2015 , there were 11,667,654 and 28,203 equity awards, respectively, that could potentially dilute basic earnings per share in the future that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

Securities

Securities	3 Months Ended
	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The following tables present the carrying value, gross unrealized gains and losses and estimated fair value for available-for-sale securities and the amortized cost, net unrealized losses, gross unrecognized gains and losses and estimated fair value for held-to-maturity securities as of the dates indicated: At March 31, 2016 Carrying value Gross unrealized gains Gross unrealized losses Estimated fair value (In thousands) Available-for-sale: Equity securities $ 5,804 719 — 6,523 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 540,298 7,031 341 546,988 Federal National Mortgage Association 724,204 10,484 376 734,312 Government National Mortgage Association 23,540 169 — 23,709 Total mortgage-backed securities available-for-sale 1,288,042 17,684 717 1,305,009 Total available-for-sale securities $ 1,293,846 18,403 717 1,311,532 At March 31, 2016 Amortized cost Net unrealized losses (1) Carrying value Gross unrecognized gains (2) Gross unrecognized losses (2) Estimated fair value (In thousands) Held-to-maturity: Debt securities: Government-sponsored enterprises $ 2,196 — 2,196 29 — 2,225 Municipal bonds 38,868 — 38,868 1,434 — 40,302 Corporate and other debt securities 59,159 (22,925 ) 36,234 36,016 — 72,250 Total debt securities held-to-maturity 100,223 (22,925 ) 77,298 37,479 — 114,777 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 497,241 (2,265 ) 494,976 7,635 225 502,386 Federal National Mortgage Association 1,297,056 (2,463 ) 1,294,593 22,320 259 1,316,654 Government National Mortgage Association 20,133 — 20,133 396 — 20,529 Total mortgage-backed securities held-to-maturity 1,814,430 (4,728 ) 1,809,702 30,351 484 1,839,569 Total held-to-maturity securities $ 1,914,653 (27,653 ) 1,887,000 67,830 484 1,954,346 (1) Net unrealized losses of held-to-maturity corporate and other debt securities represent the other than temporary charge related to other non-credit factors and is being amortized through accumulated other comprehensive income over the remaining life of the securities. For mortgage-backed securities, it represents the net loss on previously designated available-for sale securities transferred to held-to-maturity at fair value and is being amortized through accumulated other comprehensive income over the remaining life of the securities. (2) Unrecognized gains and losses of held-to-maturity securities are not reflected in the financial statements, as they represent fair value fluctuations from the later of: (i) the date a security is designated as held-to-maturity; or (ii) the date that an other than temporary impairment charge is recognized on a held-to-maturity security, through the date of the balance sheet. At December 31, 2015 Carrying value Gross unrealized gains Gross unrealized losses Estimated fair value (In thousands) Available-for-sale: Equity securities $ 5,778 733 16 6,495 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 546,652 3,242 2,443 547,451 Federal National Mortgage Association 724,851 4,520 3,299 726,072 Government National Mortgage Association 24,841 1 163 24,679 Total mortgage-backed securities available-for-sale 1,296,344 7,763 5,905 1,298,202 Total available-for-sale securities $ 1,302,122 8,496 5,921 1,304,697 At December 31, 2015 Amortized cost Net unrealized losses (1) Carrying Value Gross unrecognized gains (2) Gross unrecognized losses (2) Estimated fair value (In thousands) Held-to-maturity: Debt securities: Government-sponsored enterprises $ 4,232 — 4,232 11 — 4,243 Municipal bonds 43,058 — 43,058 1,307 — 44,365 Corporate and other debt securities 58,358 (23,245 ) 35,113 42,704 — 77,817 Total debt securities held-to-maturity 105,648 (23,245 ) 82,403 44,022 — 126,425 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 516,841 (2,502 ) 514,339 2,213 3,082 513,470 Federal National Mortgage Association 1,228,845 (2,705 ) 1,226,140 7,305 6,120 1,227,325 Government National Mortgage Association 21,330 — 21,330 125 — 21,455 Federal housing authorities 11 — 11 — — 11 Total mortgage-backed securities held-to-maturity 1,767,027 (5,207 ) 1,761,820 9,643 9,202 1,762,261 Total held-to-maturity securities $ 1,872,675 (28,452 ) 1,844,223 53,665 9,202 1,888,686 (1) Net unrealized losses of held-to-maturity corporate and other debt securities represent the other than temporary charge related to other non-credit factors and is being amortized through accumulated other comprehensive income over the remaining life of the securities. For mortgage-backed securities, it represents the net loss on previously designated available-for sale securities transferred to held-to-maturity at fair value and is being amortized through accumulated other comprehensive income over the remaining life of the securities. (2) Unrecognized gains and losses of held-to-maturity securities are not reflected in the financial statements, as they represent fair value fluctuations from the later of: (i) the date a security is designated as held-to-maturity; or (ii) the date that an other than temporary impairment charge is recognized on a held-to-maturity security, through the date of the balance sheet. A portion of the Company’s securities are pledged to secure borrowings. The contractual maturities of mortgage-backed securities are generally less than 20 years with effective lives expected to be shorter due to anticipated prepayments. Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer, therefore, mortgage-backed securities are not included in the following table. The amortized cost and estimated fair value of debt securities at March 31, 2016 , by contractual maturity, are shown below. March 31, 2016 Carrying Value Estimated fair value (In thousands) Due in one year or less $ 32,943 32,943 Due after one year through five years 3,331 3,360 Due after five years through ten years — — Due after ten years 41,024 78,474 Total $ 77,298 114,777 Gross unrealized losses on securities and the estimated fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2016 and December 31, 2015 , was as follows: March 31, 2016 Less than 12 months 12 months or more Total Estimated fair value Unrealized losses Estimated fair value Unrealized losses Estimated fair value Unrealized losses (In thousands) Available-for-sale: Mortgage-backed securities: Federal Home Loan Mortgage Corporation $ 99,570 341 — — 99,570 341 Federal National Mortgage Association 38,231 203 36,119 173 74,350 376 Total available-for-sale securities $ 137,801 544 36,119 173 173,920 717 Held-to-maturity: Mortgage-backed securities: Federal Home Loan Mortgage Corporation $ 32,543 33 4,599 192 37,142 225 Federal National Mortgage Association 65,051 112 18,229 147 83,280 259 Total held-to-maturity securities $ 97,594 145 22,828 339 120,422 484 Total $ 235,395 689 58,947 512 294,342 1,201 December 31, 2015 Less than 12 months 12 months or more Total Estimated fair value Unrealized losses Estimated fair value Unrealized losses Estimated fair value Unrealized losses (In thousands) Available-for-sale: Equity Securities $ 4,692 16 — — 4,692 16 Mortgage-backed securities: Federal Home Loan Mortgage Corporation $ 263,255 2,443 — — 263,255 2,443 Federal National Mortgage Association 375,792 2,850 14,821 449 390,613 3,299 Government National Mortgage Association 24,874 163 — — 24,874 163 Total mortgage-backed securities available-for-sale 663,921 5,456 14,821 449 678,742 5,905 Total available-for-sale securities $ 668,613 5,472 14,821 449 683,434 5,921 Held-to-maturity: Mortgage-backed securities: Federal Home Loan Mortgage Corporation 342,702 2,804 4,887 278 347,589 3,082 Federal National Mortgage Association 547,326 5,477 29,013 643 576,339 6,120 Total mortgage-backed securities held-to-maturity 890,028 8,281 33,900 921 923,928 9,202 Total held-to-maturity securities $ 890,028 8,281 33,900 921 923,928 9,202 Total $ 1,558,641 13,753 48,721 1,370 1,607,362 15,123 At March 31, 2016 , gross unrealized losses relate to our mortgage-backed-security portfolio which is comprised of securities issued by U.S. Government Sponsored Enterprises. The fair values of these securities have been positively impacted by the recent decrease in intermediate-term market interest rates. At March 31, 2016 , corporate and other debt securities include a portfolio of collateralized debt obligations backed by pooled trust preferred securities ("TruPS"), principally issued by banks and to a lesser extent insurance companies, real estate investment trusts, and collateralized debt obligations. At March 31, 2016 the TruPS had a amortized cost and estimated fair value of $36.2 million and $72.3 million , respectively. While all were investment grade at purchase, securities classified as non-investment grade at March 31, 2016 had an amortized cost and estimated fair value of $34.3 million and $65.8 million , respectively. Fair value is derived from considering specific assumptions, including terms of the TruPS structure, events of deferrals, defaults and liquidations, the projected cashflow for principal and interest payments, and discounted cash flow modeling. Other-Than-Temporary Impairment (“OTTI”) We conduct a quarterly review and evaluation of the securities portfolio to determine if the value of any security has declined below its cost or amortized cost, and whether such decline is other-than-temporary. If a determination is made that a debt security is other-than-temporarily impaired, the Company will estimate the amount of the unrealized loss that is attributable to credit and all other non-credit related factors. The credit related component will be recognized as an other-than-temporary impairment charge in non-interest income. The non-credit related component will be recorded as an adjustment to accumulated other comprehensive income, net of tax. With the assistance of a valuation specialist, we evaluate the credit and performance of each underlying issuer of our trust preferred securities by deriving probabilities and assumptions for default, recovery and prepayment/amortization for the expected cash flows for each security. At March 31, 2016 and 2015 , management deemed that the present value of projected cash flows for each security was greater than the book value and did not recognize any additional OTTI charges for the periods ended March 31, 2016 and 2015 . At March 31, 2016 , non-credit related OTTI recorded on the previously impaired pooled trust preferred securities was $22.9 million ( $13.6 million after-tax) and is being accreted into income over the estimated remaining life of the securities. The following table presents the changes in the credit loss component of the impairment loss of debt securities that the Company has written down for such loss as an other-than-temporary impairment recognized in earnings. For the Three Months Ended March 31, 2016 2015 (In thousands) Balance of credit related OTTI, beginning of period $ 100,200 108,817 Additions: Initial credit impairments — — Subsequent credit impairments — — Reductions: Accretion of credit loss impairment due to an increase in expected cash flows (1,112 ) (973 ) Balance of credit related OTTI, end of period $ 99,088 107,844 The credit loss component of the impairment loss represents the difference between the present value of expected future cash flows and the amortized cost basis of the securities prior to considering credit losses. The beginning balance represents the credit loss component for debt securities for which other-than-temporary impairment occurred prior to the period presented. If other-than-temporary impairment is recognized in earnings for credit impaired debt securities, they would be presented as additions in two components based upon whether the current period is the first time a debt security was credit impaired (initial credit impairment) or is not the first time a debt security was credit impaired (subsequent credit impairments). The credit loss component is reduced if the Company sells, intends to sell or believes it will be required to sell previously credit impaired debt securities. Additionally, the credit loss component is reduced if (i) the Company receives cash flows in excess of what it expected to receive over the remaining life of the credit impaired debt security, (ii) the security matures or (iii) the security is fully written down. Realized Gains and Losses Gains and losses on the sale of all securities are determined using the specific identification method. For the three months ended March 31, 2016, the Company received sale proceeds of $33.1 million on a pool of mortgage-backed securities from the available-for-sale portfolio resulting in a gross realized gain of $1.4 million . For the three months ended March 31, 2016 , there were no sales of securities from held-to-maturity portfolio. For the three months ended March 31, 2015 , the Company recognized gains on available-for-sale securities of $42,000 which were related to capital distributions of equity securities from the available-for-sale portfolio. For the three months ended March 31, 2015 , there were no sales of securities from held-to-maturity portfolio.

Loans Receivable, Net

Loans Receivable, Net	3 Months Ended
	Mar. 31, 2016
Receivables [Abstract]
Loans Receivable, Net	Loans Receivable, Net The detail of the loan portfolio as of March 31, 2016 and December 31, 2015 was as follows: March 31, December 31, (In thousands) Multi-family loans $ 6,521,998 6,255,904 Commercial real estate loans 3,890,839 3,821,950 Commercial and industrial loans 1,052,139 1,044,329 Construction loans 237,334 224,057 Total commercial loans 11,702,310 11,346,240 Residential mortgage loans 4,927,653 5,037,898 Consumer and other loans 511,893 496,103 Total loans excluding PCI loans 17,141,856 16,880,241 PCI loans 11,329 11,089 Net unamortized premiums and deferred loan costs (1) (13,845 ) (11,692 ) Allowance for loan losses (216,613 ) (218,505 ) Net loans $ 16,922,727 16,661,133 (1) Included in unamortized premiums and deferred loan costs are accretable purchase accounting adjustments in connection with loans acquired. Purchased Credit-Impaired Loans Purchased Credit-Impaired ("PCI") loans, are loans acquired at a discount that is due, in part, to credit quality. PCI loans are accounted for in accordance with ASC Subtopic 310-30 and are initially recorded at fair value as determined by the present value of expected future cash flows with no valuation allowance reflected in the allowance for loan losses. The following table presents changes in the accretable yield for PCI loans during the three months ended March 31, 2016 and 2015 : Three Months Ended March 31, 2016 2015 (In thousands) Balance, beginning of period 449 971 Acquisitions — — Accretion (67 ) (116 ) Net reclassification from non-accretable difference 1,221 — Balance, end of period $ 1,603 $ 855 An analysis of the allowance for loan losses is summarized as follows: Three Months Ended March 31, 2016 2015 (Dollars in thousands) Balance at beginning of the period $ 218,505 $ 200,284 Loans charged off (7,977 ) (1,899 ) Recoveries 1,085 796 Net charge-offs (6,892 ) (1,103 ) Provision for loan losses 5,000 9,000 Balance at end of the period $ 216,613 $ 208,181 The allowance for loan losses is the estimated amount considered necessary to cover credit losses inherent in the loan portfolio at the balance sheet date. The allowance is established through the provision for loan losses that is charged against income. In determining the allowance for loan losses, we make significant estimates and therefore, have identified the allowance as a critical accounting policy. The methodology for determining the allowance for loan losses is considered a critical accounting policy by management because of the high degree of judgment involved, the subjectivity of the assumptions used, and the potential for changes in the economic environment that could result in changes to the amount of the recorded allowance for loan losses. The allowance for loan losses has been determined in accordance with U.S. GAAP, under which we are required to maintain an allowance for probable losses at the balance sheet date. We are responsible for the timely and periodic determination of the amount of the allowance required. We believe that our allowance for loan losses is adequate to cover specifically identifiable losses, as well as estimated losses inherent in our portfolio for which certain losses are probable but not specifically identifiable. Loans acquired are marked to fair value on the date of acquisition with no valuation allowance reflected in the allowance for loan losses. In conjunction with the quarterly evaluation of the adequacy of the allowance for loan loss, the Company performs an analysis on acquired loans to determine whether or not there has been subsequent deterioration in relation to those loans. If deterioration has occurred, the Company will include these loans in their calculation of the allowance for loan loss. For the three months ended March 31, 2016 , the Company recorded charge-offs related to PCI loans acquired of $20,000 . Management performs a quarterly evaluation of the adequacy of the allowance for loan losses. The analysis of the allowance for loan losses has two components: specific and general allocations. Specific allocations are made for loans determined to be impaired. A loan is deemed to be impaired if it is a commercial loan with an outstanding balance greater than $1.0 million and on non-accrual status, loans modified in a troubled debt restructuring (“TDR”), and other commercial loans greater than $1.0 million if management has specific information that it is probable they will not collect all amounts due under the contractual terms of the loan agreement. Impairment is measured by determining the present value of expected future cash flows or, for collateral-dependent loans, the fair value of the collateral adjusted for market conditions and selling expenses. The general allocation is determined by segregating the remaining loans, including those loans not meeting the Company’s definition of an impaired loan, by type of loan, risk rating (if applicable) and payment history. In addition, the Company's residential portfolio is subdivided between fixed and adjustable rate loans as adjustable rate loans are deemed to be subject to more credit risk if interest rates rise. The loss factors used are based on the Company's historical loss experience over a look-back period determined to provide the appropriate amount of data to accurately estimate expected losses as of period end. Additionally, management assesses the loss emergence period for the expected losses of each loan segment and adjusts each historical loss factor accordingly. The loss emergence period is the estimated time from the date of a loss event (such as a personal bankruptcy) to the actual recognition of the loss (typically via the first full or partial loan charge-off), and is determined based upon a study of the Company's past loss experience by loan segment. The loss factors may also be adjusted to account for qualitative or environmental factors that are likely to cause estimated credit losses inherent in the portfolio to differ from historical loss experience. This evaluation is based on among other things, loan and delinquency trends, general economic conditions, geographic concentrations, lending policies and procedures and industry and peer comparisons, but is inherently subjective as it requires material estimates that may be susceptible to significant revisions based upon changes in economic and real estate market conditions. Actual loan losses may be different than the allowance for loan losses we have established which could have a material negative effect on our financial results. On a quarterly basis, management reviews the current status of various loan assets in order to evaluate the adequacy of the allowance for loan losses. In this evaluation process, specific loans are analyzed to determine their potential risk of loss. Loans determined to be impaired are evaluated for potential loss exposure. Any shortfall results in a recommendation of a charge-off or specific allowance or charge-off if the likelihood of loss is evaluated as probable. To determine the adequacy of collateral on a particular loan, an estimate of the fair value of the collateral is based on the most current appraised value available for real property or a discounted cash flow analysis on a business. This appraised value for real property is then reduced to reflect estimated liquidation expenses. The allowance contains reserves identified as unallocated. These reserves reflect management's attempt to ensure that the overall allowance reflects a margin for imprecision and the uncertainty that is inherent in estimates of probable credit losses. Our primary lending emphasis has been the origination of commercial real estate loans, multi-family loans, commercial and industrial loans and the origination and purchase of residential mortgage loans. We also originate home equity loans and home equity lines of credit. These activities resulted in a concentration of loans secured by real estate property and businesses located in New Jersey and New York. Based on the composition of our loan portfolio, we believe the primary risks are increases in interest rates, a decline in the general economy, and declines in real estate market values in New Jersey, New York and surrounding states. Any one or combination of these events may adversely affect our loan portfolio resulting in increased delinquencies, loan losses and future levels of loan loss provisions. As a substantial amount of our loan portfolio is collateralized by real estate, appraisals of the underlying value of property securing loans are critical in determining the amount of the allowance required for specific loans. Assumptions for appraisal valuations are instrumental in determining the value of properties. Negative changes to appraisal assumptions could significantly impact the valuation of a property securing a loan and the related allowance determined. The assumptions supporting such appraisals are carefully reviewed to determine that the resulting values reasonably reflect amounts realizable on the related loans. For commercial real estate, multi-family and construction loans, the Company obtains an appraisal for all collateral dependent loans upon origination. An updated appraisal is obtained annually for loans rated substandard or worse with a balance of $500,000 or greater. An updated appraisal is obtained bi-annually for loans rated special mention with a balance of $2.0 million or greater. This is done in order to determine the specific reserve or charge off needed. As part of the allowance for loan loss process, the Company reviews each collateral dependent commercial real estate loan classified as non-accrual and/or impaired and assesses whether there has been an adverse change in the collateral value supporting the loan. The Company utilizes information from its commercial lending officers and its credit department and loan workout department’s knowledge of changes in real estate conditions in our lending area to identify if possible deterioration of collateral value has occurred. Based on the severity of the changes in market conditions, management determines if an updated appraisal is warranted or if downward adjustments to the previous appraisal are warranted. If it is determined that the deterioration of the collateral value is significant enough to warrant ordering a new appraisal, an estimate of the downward adjustments to the existing appraised value is used in assessing if additional specific reserves are necessary until the updated appraisal is received. For homogeneous residential mortgage loans, the Company’s policy is to obtain an appraisal upon the origination of the loan and an updated appraisal in the event a loan becomes 90 days delinquent. Thereafter, the appraisal is updated every two years if the loan remains in non-performing status and the foreclosure process has not been completed. Management adjusts the appraised value of residential loans to reflect estimated selling costs and declines in the real estate market. Management believes the potential risk for outdated appraisals for impaired and other non-performing loans has been mitigated due to the fact that the loans are individually assessed to determine that the loan’s carrying value is not in excess of the fair value of the collateral. Loans are generally charged off after an analysis is completed which indicates that collectability of the full principal balance is in doubt. Our allowance for loan losses reflects probable losses considering, among other things, the economic conditions, the actual growth and change in composition of our loan portfolio, the level of our non-performing loans and our charge-off experience. We believe the allowance for loan losses reflects the inherent credit risk in our portfolio. Although we believe we have established and maintained the allowance for loan losses at adequate levels, additions may be necessary if the current economic environment deteriorates. Management uses the best information available; however, the level of the allowance for loan losses remains an estimate that is subject to significant judgment and short-term change. In addition, the Federal Deposit Insurance Corporation and the New Jersey Department of Banking and Insurance, as an integral part of their examination process, will periodically review our allowance for loan losses. Such agencies may require us to recognize adjustments to the allowance based on their judgments about information available to them at the time of their examination. The following tables present the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of March 31, 2016 and December 31, 2015 : March 31, 2016 Multi- Family Loans Commercial Real Estate Loans Commercial and Industrial Loans Construction Loans Residential Mortgage Loans Consumer and Other Loans Unallocated Total (Dollars in thousands) Allowance for loan losses: Beginning balance-December 31, 2015 $ 88,223 46,999 40,585 6,794 31,443 3,155 1,306 218,505 Charge-offs (10 ) (194 ) (3,966 ) (8 ) (3,622 ) (177 ) — (7,977 ) Recoveries 491 170 18 100 287 19 — 1,085 Provision 1,898 1,875 2,567 (1,267 ) 516 (390 ) (199 ) 5,000 Ending balance-March 31, 2016 $ 90,602 48,850 39,204 5,619 28,624 2,607 1,107 216,613 Individually evaluated for impairment $ — — — — 1,344 8 — 1,352 Collectively evaluated for impairment 90,602 48,850 39,204 5,619 27,280 2,599 1,107 215,261 Loans acquired with deteriorated credit quality — — — — — — — — Balance at March 31, 2016 $ 90,602 48,850 39,204 5,619 28,624 2,607 1,107 216,613 Loans: Individually evaluated for impairment $ 2,664 8,659 4,807 1,486 22,954 368 — 40,938 Collectively evaluated for impairment 6,519,334 3,882,180 1,047,332 235,848 4,904,699 511,525 — 17,100,918 Loans acquired with deteriorated credit quality — 7,900 55 1,354 1,623 397 — 11,329 Balance at March 31, 2016 $ 6,521,998 3,898,739 1,052,194 238,688 4,929,276 512,290 — 17,153,185 December 31, 2015 Multi- Family Loans Commercial Real Estate Loans Commercial and Industrial Loans Construction Loans Residential Mortgage Loans Consumer and Other Loans Unallocated Total (Dollars in thousands) Allowance for loan losses: Beginning balance-December 31, 2014 $ 71,147 44,030 20,759 6,488 47,936 3,347 6,577 200,284 Charge-offs (284 ) (1,021 ) (516 ) (466 ) (9,526 ) (403 ) — (12,216 ) Recoveries 445 807 295 317 2,295 278 — 4,437 Provision 16,915 3,183 20,047 455 (9,262 ) (67 ) (5,271 ) 26,000 Ending balance-December 31, 2015 $ 88,223 46,999 40,585 6,794 31,443 3,155 1,306 218,505 Individually evaluated for impairment $ — — 2,409 — 1,773 9 — 4,191 Collectively evaluated for impairment 88,223 46,999 38,176 6,794 29,670 3,146 1,306 214,314 Loans acquired with deteriorated credit quality — — — — — — — — Balance at December 31, 2015 $ 88,223 46,999 40,585 6,794 31,443 3,155 1,306 218,505 Loans: Individually evaluated for impairment $ 3,219 18,941 9,395 2,504 22,539 389 — 56,987 Collectively evaluated for impairment 6,252,685 3,803,009 1,034,934 221,553 5,015,359 495,714 — 16,823,254 Loans acquired with deteriorated credit quality — 7,149 56 1,786 1,645 453 — 11,089 Balance at December 31, 2015 $ 6,255,904 3,829,099 1,044,385 225,843 5,039,543 496,556 — 16,891,330 The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information and current economic trends, among other factors. For non-homogeneous loans, such as commercial and commercial real estate loans the Company analyzes the loans individually by classifying the loans as to credit risk and assesses the probability of collection for each type of class. This analysis is performed on a quarterly basis. The Company uses the following definitions for risk ratings: Pass - “Pass” assets are well protected by the current net worth and paying capacity of the obligor (or guarantors, if any) or by the fair value, less cost to acquire and sell, of any underlying collateral in a timely manner. Watch - A "Watch" asset has all the characteristics of a Pass asset but warrant more than the normal level of supervision. These loans may require more detailed reporting to management because some aspects of underwriting may not conform to policy or adverse events may have affected or could affect the cash flow or ability to continue operating profitably, provided, however, the events do not constitute an undue credit risk. Residential loans delinquent 30 - 59 days are considered watch. Special Mention - A “Special Mention” asset has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the institution’s credit position at some future date. Special Mention assets are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification. Residential loans delinquent 60 - 89 days are considered special mention. Substandard - A “Substandard” asset is inadequately protected by the current worth and paying capacity of the obligor or by the collateral pledged, if any. Assets so classified must have a well-defined weakness, or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Residential loans delinquent 90 days or greater are considered substandard. Doubtful - An asset classified “Doubtful” has all the weaknesses inherent in one classified substandard with the added characteristic that the weaknesses make collection or liquidation in full highly questionable and improbable on the basis of currently known facts, conditions, and values. Loss - An asset or portion thereof, classified “Loss” is considered uncollectible and of such little value that its continuance on the institution’s books as an asset, without establishment of a specific valuation allowance or charge-off, is not warranted. This classification does not necessarily mean that an asset has no recovery or salvage value; but rather, there is much doubt about whether, how much, or when the recovery will occur. As such, it is not practical or desirable to defer the write-off. The following tables present the risk category of loans as of March 31, 2016 and December 31, 2015 by class of loans excluding PCI loans: March 31, 2016 Pass Watch Special Mention Substandard Doubtful Loss Total (In thousands) Commercial loans: Multi-family $ 6,098,911 293,468 90,408 39,211 — — 6,521,998 Commercial real estate 3,476,202 343,770 43,434 27,433 — — 3,890,839 Commercial and industrial 801,245 220,093 23,258 7,543 — — 1,052,139 Construction 214,836 17,627 1,200 3,671 — — 237,334 Total commercial loans 10,591,194 874,958 158,300 77,858 — — 11,702,310 Residential mortgage 4,816,324 30,745 16,825 63,759 — — 4,927,653 Consumer and other 501,715 2,232 1,064 6,882 — — 511,893 Total $ 15,909,233 907,935 176,189 148,499 — — 17,141,856 December 31, 2015 Pass Watch Special Mention Substandard Doubtful Loss Total (In thousands) Commercial loans: Multi-family $ 5,876,425 325,414 17,033 37,032 — — 6,255,904 Commercial real estate 3,411,876 331,429 38,265 40,380 — — 3,821,950 Commercial and industrial 793,527 223,474 13,782 13,546 — — 1,044,329 Construction 207,499 12,833 — 3,725 — — 224,057 Total commercial loans 10,289,327 893,150 69,080 94,683 — — 11,346,240 Residential mortgage 4,930,961 24,584 13,796 68,557 — — 5,037,898 Consumer and other 482,715 3,987 427 8,974 — — 496,103 Total $ 15,703,003 921,721 83,303 172,214 — — 16,880,241 The following tables present the payment status of the recorded investment in past due loans as of March 31, 2016 and December 31, 2015 by class of loans excluding PCI loans: March 31, 2016 30-59 Days 60-89 Days Greater than 90 Days Total Past Due Current Total Loans Receivable (In thousands) Commercial loans: Multi-family $ 17,963 — 1,886 19,849 6,502,149 6,521,998 Commercial real estate 25,370 423 7,430 33,223 3,857,616 3,890,839 Commercial and industrial 4,096 2,296 780 7,172 1,044,967 1,052,139 Construction — — 516 516 236,818 237,334 Total commercial loans 47,429 2,719 10,612 60,760 11,641,550 11,702,310 Residential mortgage 30,745 16,825 63,759 111,329 4,816,324 4,927,653 Consumer and other 2,232 1,064 6,882 10,178 501,715 511,893 Total $ 80,406 20,608 81,253 182,267 16,959,589 17,141,856 December 31, 2015 30-59 Days 60-89 Days Greater than 90 Days Total Past Due Current Total Loans Receivable (In thousands) Commercial loans: Multi-family $ 14,236 — 1,886 16,122 6,239,782 6,255,904 Commercial real estate 4,171 352 6,429 10,952 3,810,998 3,821,950 Commercial and industrial 957 — 4,386 5,343 1,038,986 1,044,329 Construction — — 792 792 223,265 224,057 Total commercial loans 19,364 352 13,493 33,209 11,313,031 11,346,240 Residential mortgage 27,092 14,956 68,560 110,608 4,927,290 5,037,898 Consumer and other 3,987 427 8,976 13,390 482,713 496,103 Total $ 50,443 15,735 91,029 157,207 16,723,034 16,880,241 The following table presents non-accrual loans excluding PCI loans at the dates indicated: March 31, 2016 December 31, 2015 # of loans Amount # of loans Amount (Dollars in thousands) Non-accrual: Multi-family 3 $ 2,903 4 $ 3,467 Commercial real estate 35 10,342 37 10,820 Commercial and industrial 10 5,587 17 9,225 Construction 3 516 4 792 Total commercial loans 51 19,348 62 24,304 Residential mortgage and consumer 488 85,892 500 91,122 Total non-accrual loans 539 $ 105,240 562 $ 115,426 Included in the non-accrual table above are TDR loans whose payment status is current but the Company has classified as non-accrual as the loans have not maintained their current payment status for six consecutive months under the restructured terms and therefore do not meet the criteria for accrual status. As of March 31, 2016 and December 31, 2015 , these loans are comprised of the following: March 31, 2016 December 31, 2015 # of loans Amount # of loans Amount (Dollars in thousands) Current TDR classified as non-accrual: Multi-family 1 $ 1,016 1 $ 1,032 Commercial real estate 3 406 2 240 Commercial and industrial 2 2,208 2 2,226 Total commercial loans 6 3,630 5 3,498 Residential mortgage and consumer 18 2,980 15 3,378 Total current TDR classified as non-accrual 24 $ 6,610 20 $ 6,876 The following table presents TDR loans which were also 30-89 days delinquent and classified as non-accrual at the dates indicated: March 31, 2016 December 31, 2015 # of loans Amount # of loans Amount (Dollars in thousands) TDR 30-89 days delinquent classified as non-accrual: Multi-family — $ — 1 $ 548 Commercial real estate 2 241 5 2,309 Commercial and industrial 1 345 1 360 Total commercial loans 3 586 7 3,217 Residential mortgage and consumer 14 5,485 11 3,338 Total current TDR classified as non-accrual 17 $ 6,071 18 $ 6,555 The Company has no loans past due 90 days or more delinquent that are still accruing interest. PCI loans are excluded from non-accrual loans, as they are recorded at fair value based on the present value of expected future cash flows. As of March 31, 2016 , PCI loans with a carrying value of $11.3 million included $7.9 million of which were current, $1.4 million of which were 30 - 89 days delinquent and $2.0 million of which were 90 days or more delinquent. As of December 31, 2015 , PCI loans with a carrying value of $11.1 million included $9.0 million of which were current and $2.1 million of which were 90 days or more delinquent. At March 31, 2016 and December 31, 2015 , loans meeting the Company’s definition of an impaired loan were primarily collateral dependent loans which totaled $40.9 million and $57.0 million , respectively, with allocations of the allowance for loan losses of $1.4 million and $4.2 million for the periods ending March 31, 2016 and December 31, 2015 , respectively. During the three months ended March 31, 2016 and 2015 , interest income received and recognized on these loans totaled $393,000 and $667,000 , respectively. The following tables present loans individually evaluated for impairment by portfolio segment as of March 31, 2016 and December 31, 2015 : March 31, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) With no related allowance: Multi-family $ 2,664 5,791 — 2,144 14 Commercial real estate 8,659 17,762 — 8,096 108 Commercial and industrial 4,807 8,761 — 3,362 32 Construction 1,486 5,324 — 2,795 12 Total commercial loans 17,616 37,638 — 16,397 166 Residential mortgage and consumer 9,653 12,601 — 8,191 113 With an allowance recorded: Multi-family — — — — — Commercial real estate — — — — — Commercial and industrial — — — — — Construction — — — — — Total commercial loans — — — — — Residential mortgage and consumer 13,669 14,023 1,352 15,809 114 Total: Multi-family 2,664 5,791 — 2,144 14 Commercial real estate 8,659 17,762 — 8,096 108 Commercial and industrial 4,807 8,761 — 3,362 32 Construction 1,486 5,324 — 2,795 12 Total commercial loans 17,616 37,638 — 16,397 166 Residential mortgage and consumer 23,322 26,624 1,352 24,000 227 Total impaired loans $ 40,938 64,262 1,352 40,397 393 December 31, 2015 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) With no related allowance: Multi-family $ 3,219 6,806 — 2,872 119 Commercial real estate 18,941 27,961 — 19,025 1,136 Commercial and industrial 5,155 5,160 — 3,575 200 Construction 2,504 6,412 — 4,288 226 Total commercial loans 29,819 46,339 — 29,760 1,681 Residential mortgage and consumer 8,020 12,433 — 7,611 463 With an allowance recorded: Multi-family — — — — — Commercial real estate — — — — — Commercial and industrial 4,240 4,271 2,409 4,389 194 Construction — — — — — Total commercial loans 4,240 4,271 2,409 4,389 194 Residential mortgage and consumer 14,908 13,695 1,782 16,424 476 Total: Multi-family 3,219 6,806 — 2,872 119 Commercial real estate 18,941 27,961 — 19,025 1,136 Commercial and industrial 9,395 9,431 2,409 7,964 394 Construction 2,504 6,412 — 4,288 226 Total commercial loans 34,059 50,610 2,409 34,149 1,875 Residential mortgage and consumer 22,928 26,128 1,782 24,035 939 Total impaired loans $ 56,987 76,738 4,191 58,184 2,814 The average recorded investment is the annual average calculated based upon the ending quarterly balances. The interest income recognized is the year to date interest income recognized on a cash basis. Troubled Debt Restructurings On a case-by-case basis, the Company may agree to modify the contractual terms of a borrower’s loan to remain competitive and assist customers who may be experiencing financial difficulty, as well as preserve the Company’s position in the loan. If the borrower is experiencing financial difficulties and a concession has been made at the time of such modification, the loan is classified as a troubled debt restructured loan ("TDR"). Substantially all of our troubled debt restructured loan modifications involve lowering the monthly payments on such loans through either a reduction in interest rate below a market rate, an extension of the term of the loan, or a combination of these two methods. These modifications rarely result in the forgiveness of principal or accrued interest. In addition, we frequently obtain additional collateral or guarantor support when modifying commercial loans. Restructured loans remain on non-accrual status until there has been a sustained period of repayment performance (generally six consecutive months of payments) and both principal and interest are deemed collectible. The following table presents the total troubled debt restructured loans at March 31, 2016 and December 31, 2015 . There were two residential PCI loans that were classified as TDRs and are included in the table below at March 31, 2016 . There were three residential PCI loans that were classified as TDRs for the period ended December 31, 2015 . March 31, 2016 Accrual Non-accrual Total # of loans Amount # of loans Amount # of loans Amount (Dollars in thousands) Commercial loans: Multi-family — $ — 1 $ 1,016 1 $ 1,016 Commercial real estate 2 3,476 7 3,751 9 7,227 Commercial and industrial — — 3 2,553 3 2,553 Construction — — 1 132 1 132 Total commercial loans 2 3,476 12 7,452 14 10,928 Residential mortgage and consumer 28 7,191 59 16,132 87 23,323 Total 30 $ 10,667 71 $ 23,584 101 $ 34,251 December 31, 2015 Accrual Non-accrual Total # of loans Amount # of loans Amount # of loans Amount (Dollars in thousands) Commercial loans: Multi-family — $ — 2 $ 1,580 2 $ 1,580 Commercial real estate 5 13,161 9 5,826 14 18,987 Commercial and industrial 1 640 3 2,586 4 3,226 Construction 1 313 2 405 3 718 Total commercial loans 7 14,114 16 10,397 23 24,511 Residential mortgage and consumer 32 8,375 49 14,553 81 22,928 Total 39 $ 22,489 65 $ 24,950 104 $ 47,439 The following table presents information about troubled debt restructurings that occurred during the three months ended March 31, 2016 and 2015 : Three Months Ended March 31, 2016 2015 Number of Loans Pre-modification Recorded Investment Post- modification Recorded Investment Number of Loans Pre-modification Recorded Investment Post- modification Recorded Investment (Dollars in thousands) Troubled Debt Restructings: Commercial real estate 2 $ 442 $ 442 — $ — $ — Construction — — — 1 1,326 1,326 Residential mortgage and consumer 7 958 958 7 1,542 1,542 Post-modification recorded investment represents the net book balance immediately following modification. All TDRs are impaired loans, which are individually evaluated for impairment, as discussed above. Collateral dependent impaired loans classified as TDRs were written down to the estimated fair value of the collateral. There were no charge-offs for collateral dependant TDRs during the three months ended March 31, 2016 and 2015 . The allowance for loan losses associated with the TDRs presented in the above tables totaled $1.4 million and $1.8 million at March 31, 2016 and December 31, 2015 , respectively. Residential mortgage loan modifications primarily involved the reduction in loan interest rate and extension of loan maturity dates. All residential loans deemed to be TDRs were modified to reflect a reduction in interest rates to current market rates. Several residential TDRs include step up interest rates in their modified terms which will impact their weighted average yield in the future. Commercial loan modifications which qualified as a TDR comprised of terms of maturity being extended and reduction in interest rates to current market terms. For the three months ended March 31, 2016 , commercial loans which qualified as a TDR involved the maturity and payment terms being modified. As of March 31, 2016 and 2015 , the Company has no additional fundings to any borrowers classified as a troubled debt restructuring. The following table presents information about pre and post modification interest yield for troubled debt restructurings which occurred during the three months ended March 31, 2016 and 2015 : Three Months Ended March 31, 2016 2015 Number of Loans Pre-modification Interest Yield Post- modification Interest Yield Number of Loans Pre-modification Interest Yield Post- modification Interest Yield Troubled Debt Restructings: Commercial real estate 2 4.12 % 4.44 % — — % — % Construction — — % — % 1 5.00 % 5.00 % Residential mortgage and consumer 7 6.05 % 3.99 % 7 4.84 % 3.36 % Payment defaults for loans modified as TDR in the previous 12 months to March 31, 2016 consisted of 4 residential loans, 3 commercial real estate loans and 1 construction loan with a recorded investment of $880,000 , $246,000 and $132,000 , respectively, at March 31, 2016 . Payment defaults for loans modified as TDRs in the previous 12 months to March 31, 2015 consisted of 2 residential loans with a recorded investment of $1.1 million at March 31, 2015 .

Deposits

Deposits	3 Months Ended
	Mar. 31, 2016
Banking and Thrift [Abstract]
Deposits	Deposits Deposits are summarized as follows: March 31, 2016 December 31, 2015 (In thousands) Checking accounts $ 4,857,958 4,636,025 Money market deposits 3,837,226 3,861,317 Savings 2,082,122 2,150,004 Total transaction accounts 10,777,306 10,647,346 Certificates of deposit 3,424,081 3,416,310 Total deposits $ 14,201,387 14,063,656

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Other Intangible Assets The following table summarizes net intangible assets and goodwill at March 31, 2016 and December 31, 2015 : March 31, December 31, (In thousands) Mortgage servicing rights $ 15,803 16,248 Core deposit premiums 10,593 11,332 Other 993 160 Total other intangible assets 27,389 27,740 Goodwill 77,571 77,571 Goodwill and intangible assets $ 104,960 105,311 The following table summarizes other intangible assets as of March 31, 2016 and December 31, 2015 : Gross Intangible Asset Accumulated Amortization Valuation Allowance Net Intangible Assets (In thousands) March 31, 2016 Mortgage servicing rights $ 27,335 (11,411 ) (121 ) 15,803 Core deposit premiums 25,059 (14,466 ) — 10,593 Other 1,150 (157 ) — 993 Total other intangible assets $ 53,544 (26,034 ) (121 ) 27,389 December 31, 2015 Mortgage servicing rights $ 23,411 (7,042 ) (121 ) 16,248 Core deposit premiums 25,058 (13,726 ) — 11,332 Other 300 (140 ) — 160 Total other intangible assets $ 48,769 (20,908 ) (121 ) 27,740 Mortgage servicing rights are accounted for using the amortization method. Under this method, the Company amortizes the loan servicing asset in proportion to, and over the period of, estimated net servicing revenues. The Company sells loans on a servicing-retained basis. Loans that were sold on this basis, amounted to $2.08 billion and $2.12 billion at March 31, 2016 and December 31, 2015 respectively, all of which relate to residential mortgage loans. At March 31, 2016 and December 31, 2015 , the servicing asset, included in intangible assets, had an estimated fair value of $15.8 million and $16.2 million , respectively. For the three months ended March 31, 2016 , fair value was based on expected future cash flows considering a weighted average discount rate of 10.20% , a weighted average constant prepayment rate on mortgages of 12.24% and a weighted average life of 6.2 years . Core deposit premiums are amortized using an accelerated method and having a weighted average amortization period of 10 years .

Equity Incentive Plan

Equity Incentive Plan	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Plan	Equity Incentive Plan At the annual meeting held on June 9, 2015, stockholders of the Company approved the Investors Bancorp, Inc. 2015 Equity Incentive Plan ("2015 Plan") which provides for the issuance or delivery of up to 30,881,296 shares ( 13,234,841 restricted stock awards and 17,646,455 stock options) of Investors Bancorp, Inc. common stock. Restricted shares granted under the 2015 Plan vest in equal installments, over the service period generally ranging from 5 to 7 years beginning one year from the date of grant. Additionally, certain restricted shares awarded are performance vesting awards, which may or may not vest depending upon the attainment of certain corporate financial targets. The vesting of restricted stock may accelerate in accordance with the terms of the 2015 Plan. The product of the number of shares granted and the grant date closing market price of the Company's common stock determine the fair value of restricted shares under the 2015 Plan. Management recognizes compensation expense for the fair value of restricted shares on a straight-line basis over the requisite service period. For the three months ended March 31, 2016 , the Company granted 161,890 shares of restricted stock awards under the 2015 Plan. Stock options granted under the 2015 Plan vest in equal installments, over the service period generally ranging from 5 to 7 years beginning one year from the date of grant. The vesting of stock options may accelerate in accordance with the terms of the 2015 Plan. Stock options were granted at an exercise price equal to the fair value of the Company's common stock on the grant date based on the closing market price and have an expiration period of 10 years. For the three months ended March 31, 2016 , the Company granted 90,000 stock options under the 2015 Plan. The fair value of stock options granted as part of the 2015 Plan was estimated utilizing the Black-Scholes option pricing model using the following assumptions for the period presented below. Note that there were no grants for the three months ended March 31, 2015 . Three Months Ended March 31, 2016 Weighted average expected life (in years) 6.50 Weighted average risk-free rate of return 1.90 % Weighted average volatility 24.06 % Dividend yield 1.80 % Weighted average fair value of options granted $ 2.93 The weighted average expected life of the stock option represents the period of time that stock options are expected to be outstanding and is estimated using historical data of stock option exercises and forfeitures. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The expected volatility is based on the historical volatility of the Company's stock. The Company recognizes compensation expense for the fair values of these awards, which have graded vesting, on a straight-line basis over the requisite service period of the awards. The Company applied ASC 718 “ Compensation- Stock Compensation," ("ASC 718") and began to expense the fair value of all share-based compensation granted over the requisite service periods. ASC 718 requires the Company to report as a financing cash flow the benefits of realized tax deductions in excess of previously recognized tax benefits on compensation expense. In accordance with SEC Staff Accounting Bulletin No. 107 (“SAB 107”), the Company classified share-based compensation for employees and outside directors within “compensation and fringe benefits” in the consolidated statements of income to correspond with the same line item as the cash compensation paid. The following table presents the share based compensation expense for the three months ended March 31, 2016 and 2015 : Three Months Ended March 31, 2016 2015 (Dollars in thousands) Stock option expense $ 1,380 4 Restricted stock expense 2,953 — Total share based compensation expense $ 4,333 4 The following is a summary of the Company’s stock option activity and related information for its option plan for the three months ended March 31, 2016 : Number of Stock Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life (in years) Aggregate Intrinsic Value Outstanding at December 31, 2015 18,804,816 $10.00 6.8 $46,996 Granted 90,000 11.67 9.8 Exercised (641,322 ) 5.98 0.6 Forfeited (25,382 ) 12.54 Expired — — Outstanding at March 31, 2016 18,228,112 $10.15 6.7 $37,491 Exercisable at March 31, 2016 6,724,865 $6.07 1.7 $37,452 Expected future expense relating to the non-vested options outstanding as of March 31, 2016 is $31.6 million over a weighted average period of 5.5 years. The following is a summary of the status of the Company’s restricted shares as of March 31, 2016 and changes therein during the three months ended: Number of Shares Awarded Weighted Average Grant Date fair Value Outstanding at December 31, 2015 6,759,832 $ 12.64 Granted 161,890 11.53 Vested — — Forfeited — — Outstanding and non vested at March 31, 2016 6,921,722 $ 12.52 Expected future expense relating to the non-vested restricted shares outstanding as of March 31, 2016 is $76.4 million over a weighted average period of 5.4 years.

Net Periodic Benefit Plan Expen

Net Periodic Benefit Plan Expense	3 Months Ended
	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Net Periodic Benefit Plan Expense	Net Periodic Benefit Plan Expense The Company has an Executive Supplemental Retirement Wage Replacement Plan ("Wage Replacement Plan") and the Supplemental ESOP and Retirement Plan ("Supplemental ESOP") (collectively, the "SERPs"). The Wage Replacement Plan is a nonqualified, defined benefit plan which provides benefits to certain executives as designated by the Compensation Committee of the Board of Directors. More specifically, the Wage Replacement Plan is designed to provide participants with a normal retirement benefit equal to an annual benefit of 60% of the participant's highest annual base salary and cash inventive (over a consecutive 36-month period within the last 120 consecutive calendar months of employment) reduced by the sum of the benefits provided under the Pentagra DB Plan and the annualized value of their benefits payable under the defined benefit portion of the Supplemental ESOP. The Supplemental ESOP compensates certain executives (as designated by the Compensation Committee of the Board of Directors) participating in the Pentegra DB Plan and the ESOP whose contributions are limited by the Internal Revenue Code. The Company also maintains the Amended and Restated Director Retirement Plan ("Directors' plan") for certain directors, which is a nonqualified, defined benefit plan. This plan was frozen on November 21, 2006 such that no new benefits accrued under, and no new directors were eligible to participate in the plan. The Wage Replacement Plan, Supplemental ESOP and the Directors’ plan are unfunded and the costs of the plans are recognized over the period that services are provided. The components of net periodic benefit cost are as follows: Three Months Ended March 31, 2016 2015 (In thousands) Service cost $ 894 774 Interest cost 474 374 Amortization of: Prior service cost — 12 Net gain 536 321 Total net periodic benefit cost $ 1,904 1,481 Due to the unfunded nature of these plans, no contributions have been made or were expected to be made to the SERPs and Directors’ plan during the three months ended March 31, 2016 . The Company also maintains a defined benefit pension plan. Since it is a multiemployer plan, costs of the pension plan are based on contributions required to be made to the pension plan. There was no contribution to the defined benefit pension plan during the three months ended March 31, 2016 . We anticipate contributing funds to the plan to meet any minimum funding requirements for the remainder of 2016 .

Comprehensive Income

Comprehensive Income	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Comprehensive Income	Comprehensive Income The components of comprehensive income, both gross and net of tax, are as follows: Three Months Ended March 31, 2016 2015 Gross Tax Net Gross Tax Net (Dollars in thousands) Net income $ 71,124 (27,498 ) 43,626 67,066 (25,119 ) 41,947 Other comprehensive income: Change in funded status of retirement obligations 536 (219 ) 317 352 (144 ) 208 Unrealized gain on securities available-for-sale 16,500 (6,498 ) 10,002 8,365 (3,272 ) 5,093 Accretion of loss on securities reclassified to held to maturity available for sale 480 (196 ) 284 641 (262 ) 379 Reclassification adjustment for security gains included in net income (1,388 ) 555 (833 ) — — — Other-than-temporary impairment accretion on debt securities 322 (131 ) 191 329 (133 ) 196 Total other comprehensive income 16,450 (6,489 ) 9,961 9,687 (3,811 ) 5,876 Total comprehensive income $ 87,574 (33,987 ) 53,587 76,753 (28,930 ) 47,823 The following table presents the after-tax changes in the balances of each component of accumulated other comprehensive loss for the three months ended March 31, 2016 and 2015 : Change in funded status of retirement obligations Accretion of loss on securities reclassified to held to maturity Unrealized gain on securities available-for-sale Reclassification adjustment for gains included in net income Other-than- temporary impairment accretion on debt securities Total accumulated other comprehensive loss (Dollars in thousands) Balance - December 31, 2015 $ (12,366 ) (3,080 ) 2,918 (1,547 ) (13,750 ) (27,825 ) Net change 317 284 10,002 (833 ) 191 9,961 Balance - March 31, 2016 $ (12,049 ) (2,796 ) 12,920 (2,380 ) (13,559 ) (17,864 ) Balance - December 31, 2014 $ (10,911 ) (4,528 ) 7,851 — (14,816 ) (22,404 ) Net change 208 379 5,093 — 196 5,876 Balance - March 31, 2015 $ (10,703 ) (4,149 ) 12,944 — (14,620 ) (16,528 ) The following table presents information about amounts reclassified from accumulated other comprehensive loss to the consolidated statement of income and the affected line item in the statement where net income is presented. Three Months Ended March 31, 2016 2015 (In thousands) Reclassification adjustment for gains included in net income Gain on security transactions $ (1,388 ) — Change in funded status of retirement obligations (1) Compensation and fringe benefits: Amortization of net obligation or asset — — Amortization of prior service cost — 12 Amortization of net gain 536 340 Compensation and fringe benefits 536 352 Total before tax (852 ) 352 Income tax benefit (expense) 336 (144 ) Net of tax $ (516 ) 208 (1) These accumulated other comprehensive loss components are included in the computations of net periodic cost for our defined benefit plans and other post-retirement benefit plan. See Note 9 for additional details.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements We use fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Our securities available-for-sale are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record at fair value other assets or liabilities on a non-recurring basis, such as held-to-maturity securities, mortgage servicing rights (“MSR”), loans receivable and real estate owned (“REO”). These non-recurring fair value adjustments involve the application of lower-of-cost-or-market accounting or write-downs of individual assets. Additionally, in connection with our mortgage banking activities we have commitments to fund loans held-for-sale and commitments to sell loans, which are considered free-standing derivative instruments, the fair values of which are not material to our financial condition or results of operations. In accordance with Financial Accounting Standards Board ("FASB") ASC 820, “ Fair Value Measurements and Disclosures ”, we group our assets and liabilities at fair value in three levels, based on the markets in which the assets are traded and the reliability of the assumptions used to determine fair value. These levels are: • Level 1 – Valuation is based upon quoted prices for identical instruments traded in active markets. • Level 2 – Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market. • Level 3 – Valuation is generated from model-based techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect our own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include the use of option pricing models, discounted cash flow models and similar techniques. The results cannot be determined with precision and may not be realized in an actual sale or immediate settlement of the asset or liability. We base our fair values on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Assets Measured at Fair Value on a Recurring Basis Securities available-for-sale Our available-for-sale portfolio is carried at estimated fair value on a recurring basis, with any unrealized gains and losses, net of taxes, reported as accumulated other comprehensive income/loss in stockholders’ equity. The fair values of available-for-sale securities are based on quoted market prices (Level 1), where available. The Company obtains one price for each security primarily from a third-party pricing service (pricing service), which generally uses quoted or other observable inputs for the determination of fair value. The pricing service normally derives the security prices through recently reported trades for identical or similar securities, making adjustments through the reporting date based upon available observable market information. For securities not actively traded (Level 2), the pricing service may use quoted market prices of comparable instruments or discounted cash flow analyses, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include, but are not limited to, benchmark yields, credit spreads, default rates, prepayment speeds and non-binding broker quotes. As the Company is responsible for the determination of fair value, it performs quarterly analyses on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, the Company compares the prices received from the pricing service to a secondary pricing source. Additionally, the Company compares changes in the reported market values and returns to relevant market indices to test the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has not historically resulted in adjustment in the prices obtained from the pricing service. The following tables provide the level of valuation assumptions used to determine the carrying value of our assets measured at fair value on a recurring basis at March 31, 2016 and December 31, 2015 . Carrying Value at March 31, 2016 Total Level 1 Level 2 Level 3 (In thousands) Securities available for sale: Equity securities $ 6,523 6,523 — — Mortgage-backed securities: Federal Home Loan Mortgage Corporation 546,988 — 546,988 — Federal National Mortgage Association 734,312 — 734,312 — Government National Mortgage Association 23,709 — 23,709 — Total mortgage-backed securities available-for-sale 1,305,009 — 1,305,009 — Total securities available-for-sale $ 1,311,532 6,523 1,305,009 — Carrying Value at December 31, 2015 Total Level 1 Level 2 Level 3 (In thousands) Securities available for sale: Equity securities $ 6,495 6,495 — — Mortgage-backed securities: Federal Home Loan Mortgage Corporation 547,451 — 547,451 — Federal National Mortgage Association 726,072 — 726,072 — Government National Mortgage Association 24,679 — 24,679 — Total mortgage-backed securities available-for-sale 1,298,202 — 1,298,202 — Total securities available-for-sale $ 1,304,697 6,495 1,298,202 — There have been no changes in the methodologies used at March 31, 2016 from December 31, 2015 , and there were no transfers between Level 1 and Level 2 during the three months ended March 31, 2016 . Assets Measured at Fair Value on a Non-Recurring Basis Mortgage Servicing Rights, Net Mortgage servicing rights are carried at the lower of cost or estimated fair value. The estimated fair value of MSR is obtained through independent third party valuations through an analysis of future cash flows, incorporating estimates of assumptions market participants would use in determining fair value including market discount rates, prepayment speeds, servicing income, servicing costs, default rates and other market driven data, including the market’s perception of future interest rate movements. The prepayment speed and the discount rate are considered two of the most significant inputs in the model. At March 31, 2016 , the fair value model used prepayment speeds ranging from 1.71% to 26.28% and a discount rate of 10.20% for the valuation of the mortgage servicing rights. At December 31, 2015 , the fair value model used prepayment speeds ranging from 6.30% to 26.28% and a discount rate of 10.20% for the valuation of the mortgage servicing rights. A significant degree of judgment is involved in valuing the mortgage servicing rights using Level 3 inputs. The use of different assumptions could have a significant positive or negative effect on the fair value estimate. Loans Receivable Loans which meet certain criteria are evaluated individually for impairment. A loan is deemed to be impaired if it is a commercial loan with an outstanding balance greater than $1.0 million and on non-accrual status, loans modified in a troubled debt restructuring, and other commercial loans with $1.0 million in outstanding principal if management has specific information that it is probable they will not collect all amounts due under the contractual terms of the loan agreement. Our impaired loans are generally collateral dependent and, as such, are carried at the estimated fair value of the collateral less estimated selling costs. In order to estimate fair value, once interest or principal payments are 90 days delinquent or when the timely collection of such income is considered doubtful an updated appraisal is obtained. Thereafter, in the event the most recent appraisal does not reflect the current market conditions due to the passage of time and other factors, management will obtain an updated appraisal or make downward adjustments to the existing appraised value based on their knowledge of the property, local real estate market conditions, recent real estate transactions, and for estimated selling costs, if applicable. At March 31, 2016 , appraisals were discounted in a range of 0% - 25% . Other Real Estate Owned Other Real Estate Owned is recorded at estimated fair value, less estimated selling costs when acquired, thus establishing a new cost basis. Fair value is generally based on independent appraisals. These appraisals include adjustments to comparable assets based on the appraisers’ market knowledge and experience, and are discounted an additional 0% - 25% for estimated costs to sell. When an asset is acquired, the excess of the loan balance over fair value, less estimated selling costs, is charged to the allowance for loan losses. If the estimated fair value of the asset declines, a writedown is recorded through expense. The valuation of foreclosed assets is subjective in nature and may be adjusted in the future because of changes in economic conditions. Operating costs after acquisition are generally expensed. The following tables provides the level of valuation assumptions used to determine the carrying value of our assets measured at fair value on a non-recurring basis at March 31, 2016 and December 31, 2015 . For the three months ended March 31, 2016 there was no change to mortgage servicing rights measured at fair value on a non-recurring basis. For the year ended December 31, 2015 , there was no change to carrying value of impaired loans or mortgage servicing rights measured at fair value on a non-recurring basis. Carrying Value at March 31, 2016 Security Type Valuation Technique Unobservable Input Range Weighted Average Total Level 1 Level 2 Level 3 (In thousands) Impaired loans Market comparable Probability of default 0.0% - 25.0% 2.82% 116 — — 116 Other real estate owned Market comparable Lack of marketability 0.0% - 25.0% 8.54% 146 — — 146 $ 262 — — 262 Carrying Value at December 31, 2015 Security Type Valuation Technique Unobservable Input Range Weighted Average Total Level 1 Level 2 Level 3 (In thousands) Other real estate owned Market comparable Lack of marketability 0.0% - 25.0% 8.90% 510 — — 510 $ 510 — — 510 Other Fair Value Disclosures Fair value estimates, methods and assumptions for the Company’s financial instruments not recorded at fair value on a recurring or non-recurring basis are set forth below. Cash and Cash Equivalents For cash and due from banks, the carrying amount approximates fair value. Securities Held-to-Maturity Our held-to-maturity portfolio, consisting primarily of mortgage backed securities and other debt securities for which we have a positive intent and ability to hold to maturity, is carried at amortized cost. Management utilizes various inputs to determine the fair value of the portfolio. The Company obtains one price for each security primarily from a third-party pricing service, which generally uses quoted or other observable inputs for the determination of fair value. The pricing service normally derives the security prices through recently reported trades for identical or similar securities, making adjustments through the reporting date based upon available observable market information. For securities not actively traded, the pricing service may use quoted market prices of comparable instruments or discounted cash flow analyses, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include, but are not limited to, benchmark yields, credit spreads, default rates, prepayment speeds and non-binding broker quotes. In the absence of quoted prices and in an illiquid market, valuation techniques, which require inputs that are both significant to the fair value measurement and unobservable, are used to determine fair value of the investment. Valuation techniques are based on various assumptions, including, but not limited to cash flows, discount rates, rate of return, adjustments for nonperformance and liquidity, and liquidation values. As the Company is responsible for the determination of fair value, it performs quarterly analyses on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, the Company compares the prices received from the pricing service to a secondary pricing source. Additionally, the Company compares changes in the reported market values and returns to relevant market indices to test the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has not historically resulted in adjustment in the prices obtained from the pricing service. FHLB Stock The fair value of the Federal Home Loan Bank of New York ("FHLB") stock is its carrying value, since this is the amount for which it could be redeemed. There is no active market for this stock and the Bank is required to hold a minimum investment based upon the unpaid principal of home mortgage loans and/or FHLB advances outstanding. Loans held for sale The fair value of loans held for sale is its carrying value, since this is the amount for which the Company intends to sell it for. The fair value is determined based on quoted prices for similar instruments in active markets. Loans Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as residential mortgage and consumer. Each loan category is further segmented into fixed and adjustable rate interest terms and by performing and non-performing categories. The fair value of performing loans, except residential mortgage loans, is calculated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect the credit and interest rate risk inherent in the loan. For performing residential mortgage loans, fair value is estimated by discounting contractual cash flows adjusted for prepayment estimates using discount rates based on secondary market sources adjusted to reflect differences in servicing and credit costs, if applicable. Fair value for significant non-performing loans is based on recent external appraisals of collateral securing such loans, adjusted for the timing of anticipated cash flows. Fair values estimated in this manner do not fully incorporate an exit price approach to fair value, but instead are based on a comparison to current market rates for comparable loans. Deposit Liabilities The fair value of deposits with no stated maturity, such as savings, checking accounts and money market accounts, is equal to the amount payable on demand. The fair value of certificates of deposit is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates which approximate currently offered for deposits of similar remaining maturities. Borrowings The fair value of borrowings are based on securities dealers’ estimated fair values, when available, or estimated using discounted contractual cash flows using rates which approximate the rates offered for borrowings of similar remaining maturities. Commitments to Extend Credit The fair value of commitments to extend credit is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties. For commitments to originate fixed rate loans, fair value also considers the difference between current levels of interest rates and the committed rates. Due to the short-term nature of our outstanding commitments, the fair values of these commitments are immaterial to our financial condition. The carrying values and estimated fair values of the Company’s financial instruments are presented in the following table. March 31, 2016 Carrying Estimated Fair Value value Total Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 143,669 143,669 143,669 — — Securities available-for-sale 1,311,532 1,311,532 6,523 1,305,009 — Securities held-to-maturity 1,887,000 1,954,346 — 1,882,096 72,250 Stock in FHLB 190,240 190,240 190,240 — — Loans held for sale 3,852 3,852 — 3,852 — Net loans 16,922,727 16,946,062 — — 16,946,062 Financial liabilities: Deposits, other than time deposits $ 10,777,306 10,777,306 10,777,306 — — Time deposits 3,424,081 3,427,225 — 3,427,225 — Borrowed funds 3,527,630 3,585,648 — 3,585,648 — December 31, 2015 Carrying Estimated Fair Value value Total Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 148,904 148,904 148,904 — — Securities available-for-sale 1,304,697 1,304,697 6,495 1,298,202 — Securities held-to-maturity 1,844,223 1,888,686 — 1,810,869 77,817 Stock in FHLB 178,437 178,437 178,437 — — Loans held for sale 7,431 7,431 — 7,431 — Net loans 16,661,133 16,650,529 — — 16,650,529 Financial liabilities: Deposits, other than time deposits $ 10,647,346 10,647,346 10,647,346 — — Time deposits 3,416,310 3,414,528 — 3,414,528 — Borrowed funds 3,263,090 3,277,983 — 3,277,983 — Limitations Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on- and off-balance-sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Significant assets that are not considered financial assets include deferred tax assets, premises and equipment and bank owned life insurance. Liabilities for pension and other postretirement benefits are not considered financial liabilities. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2016
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In March 2016, the FASB issued ASU 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting", a new standard that changes the accounting for certain aspects of share-based payments to employees. The new guidance requires excess tax benefits and tax deficiencies to be recorded in the income statement when the awards vest or are settled. In addition, cash flows related to excess tax benefits will no longer be separately classified as a financing activity apart from other income tax cash flows. The standard also allows entities to repurchase more of an employee’s shares for tax withholding purposes without triggering liability accounting, clarifies that all cash payments made on an employee’s behalf for withheld shares should be presented as a financing activity on our cash flows statement, and provides an accounting policy election to account for forfeitures as they occur. The new standard is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted in any interim or annual period. The Company is currently assessing the impact that the guidance will have on its financial condition and results of operations. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)," which requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of the future minimum lease payments, at the lease commencement date. Lessor accounting remains largely unchanged under the new guidance. The guidance is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that reporting period, with early adoption permitted. A modified retrospective approach must be applied for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company is currently assessing the impact that the guidance will have on its financial condition and results of operations. In January 2016, the FASB issued ASU 2016-01, “ Financial Instruments- Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities .” This amendment supersedes the guidance to classify equity securities with readily determinable fair values into different categories, requires equity securities to be measured at fair value with changes in the fair value recognized through net income, and simplifies the impairment assessment of equity investments without readily determinable fair values. The amendment requires public business entities that are required to disclose the fair value of financial instruments measured at amortized cost on the balance sheet to measure that fair value using the exit price notion. The amendment 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. The amendment requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or in the accompanying notes to the financial statements. The amendment reduces diversity in current practice by clarifying that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity’s other deferred tax assets. This amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities should apply the amendment by means of a cumulative-effect adjustment as of the beginning of the fiscal year of adoption, with the exception of the amendment related to equity securities without readily determinable fair values, which should be applied prospectively to equity investments that exist as of the date of adoption. The Company intends to adopt the accounting standard during the first quarter of 2018, as required, and is currently evaluating the impact on its results of operations, financial position, and liquidity. In September 2015, the FASB issued ASU 2015-16, “Business Combinations- Simplifying the Accounting for Measurement-Period Adjustments." Under the new rules, acquirers no longer have to retrospectively adjust provisional amounts included in acquisition-date financial statements, when final facts and circumstances are not known on the acquisition date, and later become known in the measurement period. Instead, adjustments that are made in a later period are to be reported in that period. However, acquirers must disclose the amount of adjustments to current period income relating to amounts that would have been recognized in previous periods if the adjustments were recognized as of the acquisition date. For public business entities, the guidance in the ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. This guidance did not have a material impact to the Company's consolidated financial statements. In April 2015, the FASB issued ASU 2015-03, “Simplifying the Presentation of Debt Issuance Costs.” The ASU changes the presentation of debt issuance costs in financial statements. Under the ASU, an entity presents such costs in the balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the costs is reported as interest expense. According to the ASU’s Basis for Conclusions, debt issuance costs incurred before the associated funding is received should be reported on the balance sheet as deferred charges until that debt liability amount is recorded. For public business entities, the guidance in the ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. This guidance did not have a material impact to the Company's consolidated financial statements. In April 2015, the FASB issued ASU 2015-04, "Practical Expedient for the Measurement Date of an Employer's Defined Benefit Obligation and Plan Assets." The ASU gives an employer whose fiscal year-end does not coincide with a calendar month-end the ability, as a practical expedient, to measure defined benefit retirement obligations and related plan assets as of the month-end that is closest to its fiscal year-end. The ASU also provides guidance on accounting for contributions to the plan and significant events that require a remeasurement that occur during the period between a month-end measurement date and the employer’s fiscal year-end. An entity should reflect the effects of those contributions or significant events in the measurement of the retirement benefit obligations and related plan assets. The ASU is effective for public business entities for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. This guidance did not have a material impact to the Company's consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, " Revenue from Contracts with Customers. " The objective of this amendment is to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS. This update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are in the scope of other standards. In April 2015, the FASB issued a proposed ASU to defer for one year the effective date of the new revenue standard. The original effective date was for annual reporting periods beginning after December 15, 2016. The Company does not anticipate a material impact to the consolidated financial statements related to this guidance.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events As defined in FASB ASC 855, " Subsequent Events ", subsequent events are events or transactions that occur after the balance sheet date but before financial statements are issued or available to be issued. Financial statements are considered issued when they are widely distributed to stockholders and other financial statement users for general use and reliance in a form and format that complies with GAAP. On April 28, 2016, the Company announced its third share repurchase program, which authorized the purchase of an additional 10% of its publicly-held outstanding shares of common stock, or approximately 31 million shares. The new repurchase program commenced immediately upon completion of the second repurchase plan on June 30, 2016. In addition, the Company declared a cash dividend of $0.06 per share. The $0.06 dividend per share will be paid to stockholders on May 25, 2016, with a record date of May 10, 2016. On May 3, 2016, the Company announced the signing of a definitive merger agreement with The Bank of Princeton. Under the terms of the merger agreement, 60% of the common shares of Princeton Bank will be converted into Investors Bancorp common stock and the remaining 40% will be exchanged for cash. The Bank of Princeton shareholders will have the option to receive either 2.633 shares of Investors Bancorp common stock or $30.75 in cash for each share of The Bank of Princeton, subject to proration to ensure that, in the aggregate, 60% of The Bank of Princeton's shares will be converted into Investors Bancorp common stock. As of March 31, 2016, The Bank of Princeton had assets of $1.0 billion , loans of $842 million and deposits of $820 million and operated 10 branches in New Jersey and 3 in the Philadelphia market. The merger agreement has been approved by the boards of directors of each company. Required approvals to complete this transaction include The Bank of Princeton shareholder approval, regulatory approvals, the effectiveness of the registration statement to be filed by Investors Bancorp with respect to the stock exchanged to be issued in the transaction and other customary closing conditions. The Merger is expected to be completed in the fourth quarter of 2016. As the merger has not been completed, the transaction is not reflected in the balance sheet or results of operation for the periods presented in this document.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Summary Of Calculations And Reconciliation Of Basic To Diluted Earnings Per Share	The following is a summary of our earnings per share calculations and reconciliation of basic to diluted earnings per share. For the Three Months Ended March 31, 2016 2015 Income Shares Per Share Amount Income Shares Per Share Amount (Dollars in thousands, except per share data) Net Income $ 43,626 $ 41,947 Basic earnings per share: Income available to common stockholders $ 43,626 309,166,680 $ 0.14 $ 41,947 344,237,371 $ 0.12 Effect of dilutive common stock equivalents (1) 2,987,576 3,233,586 Diluted earnings per share: Income available to common stockholders $ 43,626 312,154,256 $ 0.14 $ 41,947 347,470,957 $ 0.12 (1) For the three months ended March 31, 2016 and 2015 , there were 11,667,654 and 28,203 equity awards, respectively, that could potentially dilute basic earnings per share in the future that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Summary of securities	The following tables present the carrying value, gross unrealized gains and losses and estimated fair value for available-for-sale securities and the amortized cost, net unrealized losses, gross unrecognized gains and losses and estimated fair value for held-to-maturity securities as of the dates indicated: At March 31, 2016 Carrying value Gross unrealized gains Gross unrealized losses Estimated fair value (In thousands) Available-for-sale: Equity securities $ 5,804 719 — 6,523 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 540,298 7,031 341 546,988 Federal National Mortgage Association 724,204 10,484 376 734,312 Government National Mortgage Association 23,540 169 — 23,709 Total mortgage-backed securities available-for-sale 1,288,042 17,684 717 1,305,009 Total available-for-sale securities $ 1,293,846 18,403 717 1,311,532 At March 31, 2016 Amortized cost Net unrealized losses (1) Carrying value Gross unrecognized gains (2) Gross unrecognized losses (2) Estimated fair value (In thousands) Held-to-maturity: Debt securities: Government-sponsored enterprises $ 2,196 — 2,196 29 — 2,225 Municipal bonds 38,868 — 38,868 1,434 — 40,302 Corporate and other debt securities 59,159 (22,925 ) 36,234 36,016 — 72,250 Total debt securities held-to-maturity 100,223 (22,925 ) 77,298 37,479 — 114,777 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 497,241 (2,265 ) 494,976 7,635 225 502,386 Federal National Mortgage Association 1,297,056 (2,463 ) 1,294,593 22,320 259 1,316,654 Government National Mortgage Association 20,133 — 20,133 396 — 20,529 Total mortgage-backed securities held-to-maturity 1,814,430 (4,728 ) 1,809,702 30,351 484 1,839,569 Total held-to-maturity securities $ 1,914,653 (27,653 ) 1,887,000 67,830 484 1,954,346 (1) Net unrealized losses of held-to-maturity corporate and other debt securities represent the other than temporary charge related to other non-credit factors and is being amortized through accumulated other comprehensive income over the remaining life of the securities. For mortgage-backed securities, it represents the net loss on previously designated available-for sale securities transferred to held-to-maturity at fair value and is being amortized through accumulated other comprehensive income over the remaining life of the securities. (2) Unrecognized gains and losses of held-to-maturity securities are not reflected in the financial statements, as they represent fair value fluctuations from the later of: (i) the date a security is designated as held-to-maturity; or (ii) the date that an other than temporary impairment charge is recognized on a held-to-maturity security, through the date of the balance sheet. At December 31, 2015 Carrying value Gross unrealized gains Gross unrealized losses Estimated fair value (In thousands) Available-for-sale: Equity securities $ 5,778 733 16 6,495 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 546,652 3,242 2,443 547,451 Federal National Mortgage Association 724,851 4,520 3,299 726,072 Government National Mortgage Association 24,841 1 163 24,679 Total mortgage-backed securities available-for-sale 1,296,344 7,763 5,905 1,298,202 Total available-for-sale securities $ 1,302,122 8,496 5,921 1,304,697 At December 31, 2015 Amortized cost Net unrealized losses (1) Carrying Value Gross unrecognized gains (2) Gross unrecognized losses (2) Estimated fair value (In thousands) Held-to-maturity: Debt securities: Government-sponsored enterprises $ 4,232 — 4,232 11 — 4,243 Municipal bonds 43,058 — 43,058 1,307 — 44,365 Corporate and other debt securities 58,358 (23,245 ) 35,113 42,704 — 77,817 Total debt securities held-to-maturity 105,648 (23,245 ) 82,403 44,022 — 126,425 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 516,841 (2,502 ) 514,339 2,213 3,082 513,470 Federal National Mortgage Association 1,228,845 (2,705 ) 1,226,140 7,305 6,120 1,227,325 Government National Mortgage Association 21,330 — 21,330 125 — 21,455 Federal housing authorities 11 — 11 — — 11 Total mortgage-backed securities held-to-maturity 1,767,027 (5,207 ) 1,761,820 9,643 9,202 1,762,261 Total held-to-maturity securities $ 1,872,675 (28,452 ) 1,844,223 53,665 9,202 1,888,686 (1) Net unrealized losses of held-to-maturity corporate and other debt securities represent the other than temporary charge related to other non-credit factors and is being amortized through accumulated other comprehensive income over the remaining life of the securities. For mortgage-backed securities, it represents the net loss on previously designated available-for sale securities transferred to held-to-maturity at fair value and is being amortized through accumulated other comprehensive income over the remaining life of the securities. (2) Unrecognized gains and losses of held-to-maturity securities are not reflected in the financial statements, as they represent fair value fluctuations from the later of: (i) the date a security is designated as held-to-maturity; or (ii) the date that an other than temporary impairment charge is recognized on a held-to-maturity security, through the date of the balance sheet.
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of debt securities at March 31, 2016 , by contractual maturity, are shown below. March 31, 2016 Carrying Value Estimated fair value (In thousands) Due in one year or less $ 32,943 32,943 Due after one year through five years 3,331 3,360 Due after five years through ten years — — Due after ten years 41,024 78,474 Total $ 77,298 114,777
Investment Securities, Continuous Unrealized Loss Position and Fair Value	Gross unrealized losses on securities and the estimated fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2016 and December 31, 2015 , was as follows: March 31, 2016 Less than 12 months 12 months or more Total Estimated fair value Unrealized losses Estimated fair value Unrealized losses Estimated fair value Unrealized losses (In thousands) Available-for-sale: Mortgage-backed securities: Federal Home Loan Mortgage Corporation $ 99,570 341 — — 99,570 341 Federal National Mortgage Association 38,231 203 36,119 173 74,350 376 Total available-for-sale securities $ 137,801 544 36,119 173 173,920 717 Held-to-maturity: Mortgage-backed securities: Federal Home Loan Mortgage Corporation $ 32,543 33 4,599 192 37,142 225 Federal National Mortgage Association 65,051 112 18,229 147 83,280 259 Total held-to-maturity securities $ 97,594 145 22,828 339 120,422 484 Total $ 235,395 689 58,947 512 294,342 1,201 December 31, 2015 Less than 12 months 12 months or more Total Estimated fair value Unrealized losses Estimated fair value Unrealized losses Estimated fair value Unrealized losses (In thousands) Available-for-sale: Equity Securities $ 4,692 16 — — 4,692 16 Mortgage-backed securities: Federal Home Loan Mortgage Corporation $ 263,255 2,443 — — 263,255 2,443 Federal National Mortgage Association 375,792 2,850 14,821 449 390,613 3,299 Government National Mortgage Association 24,874 163 — — 24,874 163 Total mortgage-backed securities available-for-sale 663,921 5,456 14,821 449 678,742 5,905 Total available-for-sale securities $ 668,613 5,472 14,821 449 683,434 5,921 Held-to-maturity: Mortgage-backed securities: Federal Home Loan Mortgage Corporation 342,702 2,804 4,887 278 347,589 3,082 Federal National Mortgage Association 547,326 5,477 29,013 643 576,339 6,120 Total mortgage-backed securities held-to-maturity 890,028 8,281 33,900 921 923,928 9,202 Total held-to-maturity securities $ 890,028 8,281 33,900 921 923,928 9,202 Total $ 1,558,641 13,753 48,721 1,370 1,607,362 15,123
Changes in Credit Loss Component of the Impairment Loss of Debt Securities for Other-than-Temporary Impairment Recognized in Earnings	The following table presents the changes in the credit loss component of the impairment loss of debt securities that the Company has written down for such loss as an other-than-temporary impairment recognized in earnings. For the Three Months Ended March 31, 2016 2015 (In thousands) Balance of credit related OTTI, beginning of period $ 100,200 108,817 Additions: Initial credit impairments — — Subsequent credit impairments — — Reductions: Accretion of credit loss impairment due to an increase in expected cash flows (1,112 ) (973 ) Balance of credit related OTTI, end of period $ 99,088 107,844

Loans Receivable, Net (Tables)

Loans Receivable, Net (Tables)	3 Months Ended
	Mar. 31, 2016
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The detail of the loan portfolio as of March 31, 2016 and December 31, 2015 was as follows: March 31, December 31, (In thousands) Multi-family loans $ 6,521,998 6,255,904 Commercial real estate loans 3,890,839 3,821,950 Commercial and industrial loans 1,052,139 1,044,329 Construction loans 237,334 224,057 Total commercial loans 11,702,310 11,346,240 Residential mortgage loans 4,927,653 5,037,898 Consumer and other loans 511,893 496,103 Total loans excluding PCI loans 17,141,856 16,880,241 PCI loans 11,329 11,089 Net unamortized premiums and deferred loan costs (1) (13,845 ) (11,692 ) Allowance for loan losses (216,613 ) (218,505 ) Net loans $ 16,922,727 16,661,133 (1) Included in unamortized premiums and deferred loan costs are accretable purchase accounting adjustments in connection with loans acquired.
Schedule of Accretable Yield Movement	The following table presents changes in the accretable yield for PCI loans during the three months ended March 31, 2016 and 2015 : Three Months Ended March 31, 2016 2015 (In thousands) Balance, beginning of period 449 971 Acquisitions — — Accretion (67 ) (116 ) Net reclassification from non-accretable difference 1,221 — Balance, end of period $ 1,603 $ 855
Summary of Analysis of the Allowance for Loan Losses	An analysis of the allowance for loan losses is summarized as follows: Three Months Ended March 31, 2016 2015 (Dollars in thousands) Balance at beginning of the period $ 218,505 $ 200,284 Loans charged off (7,977 ) (1,899 ) Recoveries 1,085 796 Net charge-offs (6,892 ) (1,103 ) Provision for loan losses 5,000 9,000 Balance at end of the period $ 216,613 $ 208,181
Summary of Loan Losses and the Recorded Investment in Loans by Portfolio Segment and Based On Impairment Method	The following tables present the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of March 31, 2016 and December 31, 2015 : March 31, 2016 Multi- Family Loans Commercial Real Estate Loans Commercial and Industrial Loans Construction Loans Residential Mortgage Loans Consumer and Other Loans Unallocated Total (Dollars in thousands) Allowance for loan losses: Beginning balance-December 31, 2015 $ 88,223 46,999 40,585 6,794 31,443 3,155 1,306 218,505 Charge-offs (10 ) (194 ) (3,966 ) (8 ) (3,622 ) (177 ) — (7,977 ) Recoveries 491 170 18 100 287 19 — 1,085 Provision 1,898 1,875 2,567 (1,267 ) 516 (390 ) (199 ) 5,000 Ending balance-March 31, 2016 $ 90,602 48,850 39,204 5,619 28,624 2,607 1,107 216,613 Individually evaluated for impairment $ — — — — 1,344 8 — 1,352 Collectively evaluated for impairment 90,602 48,850 39,204 5,619 27,280 2,599 1,107 215,261 Loans acquired with deteriorated credit quality — — — — — — — — Balance at March 31, 2016 $ 90,602 48,850 39,204 5,619 28,624 2,607 1,107 216,613 Loans: Individually evaluated for impairment $ 2,664 8,659 4,807 1,486 22,954 368 — 40,938 Collectively evaluated for impairment 6,519,334 3,882,180 1,047,332 235,848 4,904,699 511,525 — 17,100,918 Loans acquired with deteriorated credit quality — 7,900 55 1,354 1,623 397 — 11,329 Balance at March 31, 2016 $ 6,521,998 3,898,739 1,052,194 238,688 4,929,276 512,290 — 17,153,185 December 31, 2015 Multi- Family Loans Commercial Real Estate Loans Commercial and Industrial Loans Construction Loans Residential Mortgage Loans Consumer and Other Loans Unallocated Total (Dollars in thousands) Allowance for loan losses: Beginning balance-December 31, 2014 $ 71,147 44,030 20,759 6,488 47,936 3,347 6,577 200,284 Charge-offs (284 ) (1,021 ) (516 ) (466 ) (9,526 ) (403 ) — (12,216 ) Recoveries 445 807 295 317 2,295 278 — 4,437 Provision 16,915 3,183 20,047 455 (9,262 ) (67 ) (5,271 ) 26,000 Ending balance-December 31, 2015 $ 88,223 46,999 40,585 6,794 31,443 3,155 1,306 218,505 Individually evaluated for impairment $ — — 2,409 — 1,773 9 — 4,191 Collectively evaluated for impairment 88,223 46,999 38,176 6,794 29,670 3,146 1,306 214,314 Loans acquired with deteriorated credit quality — — — — — — — — Balance at December 31, 2015 $ 88,223 46,999 40,585 6,794 31,443 3,155 1,306 218,505 Loans: Individually evaluated for impairment $ 3,219 18,941 9,395 2,504 22,539 389 — 56,987 Collectively evaluated for impairment 6,252,685 3,803,009 1,034,934 221,553 5,015,359 495,714 — 16,823,254 Loans acquired with deteriorated credit quality — 7,149 56 1,786 1,645 453 — 11,089 Balance at December 31, 2015 $ 6,255,904 3,829,099 1,044,385 225,843 5,039,543 496,556 — 16,891,330
Schedule of Risk Category of Loans by Class of Loans	The following tables present the risk category of loans as of March 31, 2016 and December 31, 2015 by class of loans excluding PCI loans: March 31, 2016 Pass Watch Special Mention Substandard Doubtful Loss Total (In thousands) Commercial loans: Multi-family $ 6,098,911 293,468 90,408 39,211 — — 6,521,998 Commercial real estate 3,476,202 343,770 43,434 27,433 — — 3,890,839 Commercial and industrial 801,245 220,093 23,258 7,543 — — 1,052,139 Construction 214,836 17,627 1,200 3,671 — — 237,334 Total commercial loans 10,591,194 874,958 158,300 77,858 — — 11,702,310 Residential mortgage 4,816,324 30,745 16,825 63,759 — — 4,927,653 Consumer and other 501,715 2,232 1,064 6,882 — — 511,893 Total $ 15,909,233 907,935 176,189 148,499 — — 17,141,856 December 31, 2015 Pass Watch Special Mention Substandard Doubtful Loss Total (In thousands) Commercial loans: Multi-family $ 5,876,425 325,414 17,033 37,032 — — 6,255,904 Commercial real estate 3,411,876 331,429 38,265 40,380 — — 3,821,950 Commercial and industrial 793,527 223,474 13,782 13,546 — — 1,044,329 Construction 207,499 12,833 — 3,725 — — 224,057 Total commercial loans 10,289,327 893,150 69,080 94,683 — — 11,346,240 Residential mortgage 4,930,961 24,584 13,796 68,557 — — 5,037,898 Consumer and other 482,715 3,987 427 8,974 — — 496,103 Total $ 15,703,003 921,721 83,303 172,214 — — 16,880,241
Payment Status of the Recorded Investment in Past Due Loans	The following tables present the payment status of the recorded investment in past due loans as of March 31, 2016 and December 31, 2015 by class of loans excluding PCI loans: March 31, 2016 30-59 Days 60-89 Days Greater than 90 Days Total Past Due Current Total Loans Receivable (In thousands) Commercial loans: Multi-family $ 17,963 — 1,886 19,849 6,502,149 6,521,998 Commercial real estate 25,370 423 7,430 33,223 3,857,616 3,890,839 Commercial and industrial 4,096 2,296 780 7,172 1,044,967 1,052,139 Construction — — 516 516 236,818 237,334 Total commercial loans 47,429 2,719 10,612 60,760 11,641,550 11,702,310 Residential mortgage 30,745 16,825 63,759 111,329 4,816,324 4,927,653 Consumer and other 2,232 1,064 6,882 10,178 501,715 511,893 Total $ 80,406 20,608 81,253 182,267 16,959,589 17,141,856 December 31, 2015 30-59 Days 60-89 Days Greater than 90 Days Total Past Due Current Total Loans Receivable (In thousands) Commercial loans: Multi-family $ 14,236 — 1,886 16,122 6,239,782 6,255,904 Commercial real estate 4,171 352 6,429 10,952 3,810,998 3,821,950 Commercial and industrial 957 — 4,386 5,343 1,038,986 1,044,329 Construction — — 792 792 223,265 224,057 Total commercial loans 19,364 352 13,493 33,209 11,313,031 11,346,240 Residential mortgage 27,092 14,956 68,560 110,608 4,927,290 5,037,898 Consumer and other 3,987 427 8,976 13,390 482,713 496,103 Total $ 50,443 15,735 91,029 157,207 16,723,034 16,880,241
Non-Accrual Loans Status	The following table presents non-accrual loans excluding PCI loans at the dates indicated: March 31, 2016 December 31, 2015 # of loans Amount # of loans Amount (Dollars in thousands) Non-accrual: Multi-family 3 $ 2,903 4 $ 3,467 Commercial real estate 35 10,342 37 10,820 Commercial and industrial 10 5,587 17 9,225 Construction 3 516 4 792 Total commercial loans 51 19,348 62 24,304 Residential mortgage and consumer 488 85,892 500 91,122 Total non-accrual loans 539 $ 105,240 562 $ 115,426 Included in the non-accrual table above are TDR loans whose payment status is current but the Company has classified as non-accrual as the loans have not maintained their current payment status for six consecutive months under the restructured terms and therefore do not meet the criteria for accrual status. As of March 31, 2016 and December 31, 2015 , these loans are comprised of the following: March 31, 2016 December 31, 2015 # of loans Amount # of loans Amount (Dollars in thousands) Current TDR classified as non-accrual: Multi-family 1 $ 1,016 1 $ 1,032 Commercial real estate 3 406 2 240 Commercial and industrial 2 2,208 2 2,226 Total commercial loans 6 3,630 5 3,498 Residential mortgage and consumer 18 2,980 15 3,378 Total current TDR classified as non-accrual 24 $ 6,610 20 $ 6,876 The following table presents TDR loans which were also 30-89 days delinquent and classified as non-accrual at the dates indicated: March 31, 2016 December 31, 2015 # of loans Amount # of loans Amount (Dollars in thousands) TDR 30-89 days delinquent classified as non-accrual: Multi-family — $ — 1 $ 548 Commercial real estate 2 241 5 2,309 Commercial and industrial 1 345 1 360 Total commercial loans 3 586 7 3,217 Residential mortgage and consumer 14 5,485 11 3,338 Total current TDR classified as non-accrual 17 $ 6,071 18 $ 6,555
Loans Individually Evaluated for Impairment by Class of Loans	The following tables present loans individually evaluated for impairment by portfolio segment as of March 31, 2016 and December 31, 2015 : March 31, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) With no related allowance: Multi-family $ 2,664 5,791 — 2,144 14 Commercial real estate 8,659 17,762 — 8,096 108 Commercial and industrial 4,807 8,761 — 3,362 32 Construction 1,486 5,324 — 2,795 12 Total commercial loans 17,616 37,638 — 16,397 166 Residential mortgage and consumer 9,653 12,601 — 8,191 113 With an allowance recorded: Multi-family — — — — — Commercial real estate — — — — — Commercial and industrial — — — — — Construction — — — — — Total commercial loans — — — — — Residential mortgage and consumer 13,669 14,023 1,352 15,809 114 Total: Multi-family 2,664 5,791 — 2,144 14 Commercial real estate 8,659 17,762 — 8,096 108 Commercial and industrial 4,807 8,761 — 3,362 32 Construction 1,486 5,324 — 2,795 12 Total commercial loans 17,616 37,638 — 16,397 166 Residential mortgage and consumer 23,322 26,624 1,352 24,000 227 Total impaired loans $ 40,938 64,262 1,352 40,397 393 December 31, 2015 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) With no related allowance: Multi-family $ 3,219 6,806 — 2,872 119 Commercial real estate 18,941 27,961 — 19,025 1,136 Commercial and industrial 5,155 5,160 — 3,575 200 Construction 2,504 6,412 — 4,288 226 Total commercial loans 29,819 46,339 — 29,760 1,681 Residential mortgage and consumer 8,020 12,433 — 7,611 463 With an allowance recorded: Multi-family — — — — — Commercial real estate — — — — — Commercial and industrial 4,240 4,271 2,409 4,389 194 Construction — — — — — Total commercial loans 4,240 4,271 2,409 4,389 194 Residential mortgage and consumer 14,908 13,695 1,782 16,424 476 Total: Multi-family 3,219 6,806 — 2,872 119 Commercial real estate 18,941 27,961 — 19,025 1,136 Commercial and industrial 9,395 9,431 2,409 7,964 394 Construction 2,504 6,412 — 4,288 226 Total commercial loans 34,059 50,610 2,409 34,149 1,875 Residential mortgage and consumer 22,928 26,128 1,782 24,035 939 Total impaired loans $ 56,987 76,738 4,191 58,184 2,814
Troubled Debt Restructured Loans	The following table presents the total troubled debt restructured loans at March 31, 2016 and December 31, 2015 . There were two residential PCI loans that were classified as TDRs and are included in the table below at March 31, 2016 . There were three residential PCI loans that were classified as TDRs for the period ended December 31, 2015 . March 31, 2016 Accrual Non-accrual Total # of loans Amount # of loans Amount # of loans Amount (Dollars in thousands) Commercial loans: Multi-family — $ — 1 $ 1,016 1 $ 1,016 Commercial real estate 2 3,476 7 3,751 9 7,227 Commercial and industrial — — 3 2,553 3 2,553 Construction — — 1 132 1 132 Total commercial loans 2 3,476 12 7,452 14 10,928 Residential mortgage and consumer 28 7,191 59 16,132 87 23,323 Total 30 $ 10,667 71 $ 23,584 101 $ 34,251 December 31, 2015 Accrual Non-accrual Total # of loans Amount # of loans Amount # of loans Amount (Dollars in thousands) Commercial loans: Multi-family — $ — 2 $ 1,580 2 $ 1,580 Commercial real estate 5 13,161 9 5,826 14 18,987 Commercial and industrial 1 640 3 2,586 4 3,226 Construction 1 313 2 405 3 718 Total commercial loans 7 14,114 16 10,397 23 24,511 Residential mortgage and consumer 32 8,375 49 14,553 81 22,928 Total 39 $ 22,489 65 $ 24,950 104 $ 47,439
Schedule of Troubled Debt Restructurings	The following table presents information about troubled debt restructurings that occurred during the three months ended March 31, 2016 and 2015 : Three Months Ended March 31, 2016 2015 Number of Loans Pre-modification Recorded Investment Post- modification Recorded Investment Number of Loans Pre-modification Recorded Investment Post- modification Recorded Investment (Dollars in thousands) Troubled Debt Restructings: Commercial real estate 2 $ 442 $ 442 — $ — $ — Construction — — — 1 1,326 1,326 Residential mortgage and consumer 7 958 958 7 1,542 1,542
Schedule of Troubled Debt Restructuring, Interest Yield	The following table presents information about pre and post modification interest yield for troubled debt restructurings which occurred during the three months ended March 31, 2016 and 2015 : Three Months Ended March 31, 2016 2015 Number of Loans Pre-modification Interest Yield Post- modification Interest Yield Number of Loans Pre-modification Interest Yield Post- modification Interest Yield Troubled Debt Restructings: Commercial real estate 2 4.12 % 4.44 % — — % — % Construction — — % — % 1 5.00 % 5.00 % Residential mortgage and consumer 7 6.05 % 3.99 % 7 4.84 % 3.36 %

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2016
Banking and Thrift [Abstract]
Summary of Deposits	Deposits are summarized as follows: March 31, 2016 December 31, 2015 (In thousands) Checking accounts $ 4,857,958 4,636,025 Money market deposits 3,837,226 3,861,317 Savings 2,082,122 2,150,004 Total transaction accounts 10,777,306 10,647,346 Certificates of deposit 3,424,081 3,416,310 Total deposits $ 14,201,387 14,063,656

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	The following table summarizes net intangible assets and goodwill at March 31, 2016 and December 31, 2015 : March 31, December 31, (In thousands) Mortgage servicing rights $ 15,803 16,248 Core deposit premiums 10,593 11,332 Other 993 160 Total other intangible assets 27,389 27,740 Goodwill 77,571 77,571 Goodwill and intangible assets $ 104,960 105,311
Summary of Intangible Assets	The following table summarizes other intangible assets as of March 31, 2016 and December 31, 2015 : Gross Intangible Asset Accumulated Amortization Valuation Allowance Net Intangible Assets (In thousands) March 31, 2016 Mortgage servicing rights $ 27,335 (11,411 ) (121 ) 15,803 Core deposit premiums 25,059 (14,466 ) — 10,593 Other 1,150 (157 ) — 993 Total other intangible assets $ 53,544 (26,034 ) (121 ) 27,389 December 31, 2015 Mortgage servicing rights $ 23,411 (7,042 ) (121 ) 16,248 Core deposit premiums 25,058 (13,726 ) — 11,332 Other 300 (140 ) — 160 Total other intangible assets $ 48,769 (20,908 ) (121 ) 27,740

Equity Incentive Plan (Tables)

Equity Incentive Plan (Tables)	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The fair value of stock options granted as part of the 2015 Plan was estimated utilizing the Black-Scholes option pricing model using the following assumptions for the period presented below. Note that there were no grants for the three months ended March 31, 2015 . Three Months Ended March 31, 2016 Weighted average expected life (in years) 6.50 Weighted average risk-free rate of return 1.90 % Weighted average volatility 24.06 % Dividend yield 1.80 % Weighted average fair value of options granted $ 2.93
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	The following table presents the share based compensation expense for the three months ended March 31, 2016 and 2015 : Three Months Ended March 31, 2016 2015 (Dollars in thousands) Stock option expense $ 1,380 4 Restricted stock expense 2,953 — Total share based compensation expense $ 4,333 4
Schedule of Share-based Compensation, Stock Options, Activity	The following is a summary of the Company’s stock option activity and related information for its option plan for the three months ended March 31, 2016 : Number of Stock Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life (in years) Aggregate Intrinsic Value Outstanding at December 31, 2015 18,804,816 $10.00 6.8 $46,996 Granted 90,000 11.67 9.8 Exercised (641,322 ) 5.98 0.6 Forfeited (25,382 ) 12.54 Expired — — Outstanding at March 31, 2016 18,228,112 $10.15 6.7 $37,491 Exercisable at March 31, 2016 6,724,865 $6.07 1.7 $37,452
Schedule of Nonvested Restricted Stock Units Activity	The following is a summary of the status of the Company’s restricted shares as of March 31, 2016 and changes therein during the three months ended: Number of Shares Awarded Weighted Average Grant Date fair Value Outstanding at December 31, 2015 6,759,832 $ 12.64 Granted 161,890 11.53 Vested — — Forfeited — — Outstanding and non vested at March 31, 2016 6,921,722 $ 12.52

Net Periodic Benefit Plan Exp28

Net Periodic Benefit Plan Expense (Tables)	3 Months Ended
	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Components Of Net Periodic Benefit Cost	The components of net periodic benefit cost are as follows: Three Months Ended March 31, 2016 2015 (In thousands) Service cost $ 894 774 Interest cost 474 374 Amortization of: Prior service cost — 12 Net gain 536 321 Total net periodic benefit cost $ 1,904 1,481

Comprehensive Income (Tables)

Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Components of Comprehensive Income (Loss), Gross and Net Of Tax	The components of comprehensive income, both gross and net of tax, are as follows: Three Months Ended March 31, 2016 2015 Gross Tax Net Gross Tax Net (Dollars in thousands) Net income $ 71,124 (27,498 ) 43,626 67,066 (25,119 ) 41,947 Other comprehensive income: Change in funded status of retirement obligations 536 (219 ) 317 352 (144 ) 208 Unrealized gain on securities available-for-sale 16,500 (6,498 ) 10,002 8,365 (3,272 ) 5,093 Accretion of loss on securities reclassified to held to maturity available for sale 480 (196 ) 284 641 (262 ) 379 Reclassification adjustment for security gains included in net income (1,388 ) 555 (833 ) — — — Other-than-temporary impairment accretion on debt securities 322 (131 ) 191 329 (133 ) 196 Total other comprehensive income 16,450 (6,489 ) 9,961 9,687 (3,811 ) 5,876 Total comprehensive income $ 87,574 (33,987 ) 53,587 76,753 (28,930 ) 47,823
Component of Accumulated Other Comprehensive Loss	The following table presents the after-tax changes in the balances of each component of accumulated other comprehensive loss for the three months ended March 31, 2016 and 2015 : Change in funded status of retirement obligations Accretion of loss on securities reclassified to held to maturity Unrealized gain on securities available-for-sale Reclassification adjustment for gains included in net income Other-than- temporary impairment accretion on debt securities Total accumulated other comprehensive loss (Dollars in thousands) Balance - December 31, 2015 $ (12,366 ) (3,080 ) 2,918 (1,547 ) (13,750 ) (27,825 ) Net change 317 284 10,002 (833 ) 191 9,961 Balance - March 31, 2016 $ (12,049 ) (2,796 ) 12,920 (2,380 ) (13,559 ) (17,864 ) Balance - December 31, 2014 $ (10,911 ) (4,528 ) 7,851 — (14,816 ) (22,404 ) Net change 208 379 5,093 — 196 5,876 Balance - March 31, 2015 $ (10,703 ) (4,149 ) 12,944 — (14,620 ) (16,528 ) The following table presents information about amounts reclassified from accumulated other comprehensive loss to the consolidated statement of income and the affected line item in the statement where net income is presented. Three Months Ended March 31, 2016 2015 (In thousands) Reclassification adjustment for gains included in net income Gain on security transactions $ (1,388 ) — Change in funded status of retirement obligations (1) Compensation and fringe benefits: Amortization of net obligation or asset — — Amortization of prior service cost — 12 Amortization of net gain 536 340 Compensation and fringe benefits 536 352 Total before tax (852 ) 352 Income tax benefit (expense) 336 (144 ) Net of tax $ (516 ) 208 (1) These accumulated other comprehensive loss components are included in the computations of net periodic cost for our defined benefit plans and other post-retirement benefit plan. See Note 9 for additional details.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The following tables provide the level of valuation assumptions used to determine the carrying value of our assets measured at fair value on a recurring basis at March 31, 2016 and December 31, 2015 . Carrying Value at March 31, 2016 Total Level 1 Level 2 Level 3 (In thousands) Securities available for sale: Equity securities $ 6,523 6,523 — — Mortgage-backed securities: Federal Home Loan Mortgage Corporation 546,988 — 546,988 — Federal National Mortgage Association 734,312 — 734,312 — Government National Mortgage Association 23,709 — 23,709 — Total mortgage-backed securities available-for-sale 1,305,009 — 1,305,009 — Total securities available-for-sale $ 1,311,532 6,523 1,305,009 — Carrying Value at December 31, 2015 Total Level 1 Level 2 Level 3 (In thousands) Securities available for sale: Equity securities $ 6,495 6,495 — — Mortgage-backed securities: Federal Home Loan Mortgage Corporation 547,451 — 547,451 — Federal National Mortgage Association 726,072 — 726,072 — Government National Mortgage Association 24,679 — 24,679 — Total mortgage-backed securities available-for-sale 1,298,202 — 1,298,202 — Total securities available-for-sale $ 1,304,697 6,495 1,298,202 —
Carrying Value Of Our Assets Measured At Fair Value On A Non-Recurring Basis	The following tables provides the level of valuation assumptions used to determine the carrying value of our assets measured at fair value on a non-recurring basis at March 31, 2016 and December 31, 2015 . For the three months ended March 31, 2016 there was no change to mortgage servicing rights measured at fair value on a non-recurring basis. For the year ended December 31, 2015 , there was no change to carrying value of impaired loans or mortgage servicing rights measured at fair value on a non-recurring basis. Carrying Value at March 31, 2016 Security Type Valuation Technique Unobservable Input Range Weighted Average Total Level 1 Level 2 Level 3 (In thousands) Impaired loans Market comparable Probability of default 0.0% - 25.0% 2.82% 116 — — 116 Other real estate owned Market comparable Lack of marketability 0.0% - 25.0% 8.54% 146 — — 146 $ 262 — — 262 Carrying Value at December 31, 2015 Security Type Valuation Technique Unobservable Input Range Weighted Average Total Level 1 Level 2 Level 3 (In thousands) Other real estate owned Market comparable Lack of marketability 0.0% - 25.0% 8.90% 510 — — 510 $ 510 — — 510
Carrying Amounts And Estimated Fair Values	The carrying values and estimated fair values of the Company’s financial instruments are presented in the following table. March 31, 2016 Carrying Estimated Fair Value value Total Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 143,669 143,669 143,669 — — Securities available-for-sale 1,311,532 1,311,532 6,523 1,305,009 — Securities held-to-maturity 1,887,000 1,954,346 — 1,882,096 72,250 Stock in FHLB 190,240 190,240 190,240 — — Loans held for sale 3,852 3,852 — 3,852 — Net loans 16,922,727 16,946,062 — — 16,946,062 Financial liabilities: Deposits, other than time deposits $ 10,777,306 10,777,306 10,777,306 — — Time deposits 3,424,081 3,427,225 — 3,427,225 — Borrowed funds 3,527,630 3,585,648 — 3,585,648 — December 31, 2015 Carrying Estimated Fair Value value Total Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 148,904 148,904 148,904 — — Securities available-for-sale 1,304,697 1,304,697 6,495 1,298,202 — Securities held-to-maturity 1,844,223 1,888,686 — 1,810,869 77,817 Stock in FHLB 178,437 178,437 178,437 — — Loans held for sale 7,431 7,431 — 7,431 — Net loans 16,661,133 16,650,529 — — 16,650,529 Financial liabilities: Deposits, other than time deposits $ 10,647,346 10,647,346 10,647,346 — — Time deposits 3,416,310 3,414,528 — 3,414,528 — Borrowed funds 3,263,090 3,277,983 — 3,277,983 —

Basis of Presentation (Details)

Basis of Presentation (Details) $ / shares in Units, $ in Millions	May. 07, 2014$ / sharesshares	May. 07, 2014USD ($)$ / sharesshares	Mar. 31, 2016shares	Mar. 31, 2015shares
Schedule of Accounting Policies [Line Items]
Net proceeds from selling shares of common stock | $		$ 2,150
Purchase of treasury stock (shares)			12,150,000	2,950,000
Predecessor | Investors Bancorp, MHC
Schedule of Accounting Policies [Line Items]
Sale of stock, percentage of ownership before transaction, percentage		62.00%
Successor | IPO
Schedule of Accounting Policies [Line Items]
Initial public stock offering (shares)		219,580,695
Share price (per share) | $ / shares	$ 10	$ 10
Shares issued in exchange of each share of converted stock (shares)	2.55
Shares issued as part of conversion (shares)	137,560,968
Purchase of treasury stock (shares)	1,101,694
Investors Charitable Foundation | Successor | IPO
Schedule of Accounting Policies [Line Items]
Initial public stock offering (shares)		1,000,000

Stock Transactions Stock Transa

Stock Transactions Stock Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 09, 2015	Mar. 16, 2015	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Percentage of shares to be repurchased (percentage)	10.00%	5.00%
Number of shares authorized to be repurchased (shares)	34,779,211	17,911,561
Purchase of treasury stock (shares)			12,150,000	2,950,000
Stock repurchased during period, value			$ 140,192	$ 34,709
Stock repurchase cost, per share (usd per share)			$ 11.54

Earnings Per Share (Summary of

Earnings Per Share (Summary of Calculations and Reconciliation of Basic to Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share Reconciliation [Abstract]
Net income	$ 43,626	$ 41,947
Income available to common stockholders, Basic	$ 43,626	$ 41,947
Income available to common stockholders, Basic (shares)	309,166,680	344,237,371
Basic and Diluted earnings per share (usd per share)	$ 0.14	$ 0.12
Effect of dilutive common stock equivalents, Basic (shares)	2,987,576	3,233,586
Income available to common stockholders, Diluted	$ 43,626	$ 41,947
Income available to common stockholders, Diluted (shares)	312,154,256	347,470,957
Diluted earnings per common share (usd per share)	$ 0.14	$ 0.12
Equity awards
Earnings Per Share Reconciliation [Abstract]
Securities excluded from computation of diluted earnings per share	11,667,654	28,203

Securities (Narrative) (Details

Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Investment [Line Items]
Carrying value of held to maturity security	$ 1,887,000		$ 1,844,223
Estimated fair value	1,954,346		$ 1,888,686
Non credit-related OTTI	22,900
Non credit-related OTTI, after-tax	$ 13,600
Gross realized gain from sale of Available-for-sale securities		$ 42
Corporate and other debt securities
Investment [Line Items]
Debt maturities, term (years)	20 years
Carrying value of held to maturity security	$ 34,300
Estimated fair value	65,800
TruP Security
Investment [Line Items]
Sale proceeds	33,100
Gross realized gain from sale of Available-for-sale securities	$ 1,400

Securities (Summary of Securiti

Securities (Summary of Securities- AFS) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Carrying value	$ 1,293,846	$ 1,302,122
Gross unrecognized gains	18,403	8,496
Gross unrecognized losses	717	5,921
Estimated fair value	1,311,532	1,304,697
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Carrying value	5,804	5,778
Gross unrecognized gains	719	733
Gross unrecognized losses	0	16
Estimated fair value	6,523	6,495
Mortgage-backed securities:
Schedule of Available-for-sale Securities [Line Items]
Carrying value	1,288,042	1,296,344
Gross unrecognized gains	17,684	7,763
Gross unrecognized losses	717	5,905
Estimated fair value	1,305,009	1,298,202
Federal Home Loan Mortgage Corporation
Schedule of Available-for-sale Securities [Line Items]
Carrying value	540,298	546,652
Gross unrecognized gains	7,031	3,242
Gross unrecognized losses	341	2,443
Estimated fair value	546,988	547,451
Federal National Mortgage Association
Schedule of Available-for-sale Securities [Line Items]
Carrying value	724,204	724,851
Gross unrecognized gains	10,484	4,520
Gross unrecognized losses	376	3,299
Estimated fair value	734,312	726,072
Government National Mortgage Association
Schedule of Available-for-sale Securities [Line Items]
Carrying value	23,540	24,841
Gross unrecognized gains	169	1
Gross unrecognized losses	0	163
Estimated fair value	$ 23,709	$ 24,679

Securities (Summary of Securi36

Securities (Summary of Securities- HTM) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Net unrealized losses	$ (99,088)	$ (100,200)	$ (107,844)	$ (108,817)
Carrying value	1,887,000	1,844,223
Gross unrealized losses	484	9,202
Estimated fair value	1,954,346	1,888,686
Held-to-maturity:
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	1,914,653	1,872,675
Net unrealized losses	(27,653)	(28,452)
Carrying value	1,887,000	1,844,223
Gross unrecognized gains	67,830	53,665
Gross unrealized losses	484	9,202
Estimated fair value	1,954,346	1,888,686
Government-sponsored enterprises
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	2,196	4,232
Net unrealized losses	0	0
Carrying value	2,196	4,232
Gross unrecognized gains	29	11
Gross unrealized losses	0	0
Estimated fair value	2,225	4,243
Municipal bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	38,868	43,058
Net unrealized losses	0	0
Carrying value	38,868	43,058
Gross unrecognized gains	1,434	1,307
Gross unrealized losses	0	0
Estimated fair value	40,302	44,365
Corporate and other debt securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	59,159	58,358
Net unrealized losses	(22,925)	(23,245)
Carrying value	36,234	35,113
Gross unrecognized gains	36,016	42,704
Gross unrealized losses	0	0
Estimated fair value	72,250	77,817
Total debt securities held-to-maturity
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	100,223	105,648
Net unrealized losses	(22,925)	(23,245)
Carrying value	77,298	82,403
Gross unrecognized gains	37,479	44,022
Gross unrealized losses	0	0
Estimated fair value	114,777	126,425
Mortgage-backed securities:
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	1,814,430	1,767,027
Net unrealized losses	(4,728)	(5,207)
Carrying value	1,809,702	1,761,820
Gross unrecognized gains	30,351	9,643
Gross unrealized losses	484	9,202
Estimated fair value	1,839,569	1,762,261
Federal Home Loan Mortgage Corporation
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	497,241	516,841
Net unrealized losses	(2,265)	(2,502)
Carrying value	494,976	514,339
Gross unrecognized gains	7,635	2,213
Gross unrealized losses	225	3,082
Estimated fair value	502,386	513,470
Federal National Mortgage Association
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	1,297,056	1,228,845
Net unrealized losses	(2,463)	(2,705)
Carrying value	1,294,593	1,226,140
Gross unrecognized gains	22,320	7,305
Gross unrealized losses	259	6,120
Estimated fair value	1,316,654	1,227,325
Government National Mortgage Association
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	20,133	21,330
Net unrealized losses	0	0
Carrying value	20,133	21,330
Gross unrecognized gains	396	125
Gross unrealized losses	0	0
Estimated fair value	$ 20,529	21,455
Federal Housing Authorities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		11
Net unrealized losses		0
Carrying value		11
Gross unrecognized gains		0
Gross unrealized losses		0
Estimated fair value		$ 11

Securities (Amortized Cost and

Securities (Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Carrying value	$ 1,887,000	$ 1,844,223
Total, Estimated fair value	1,954,346	$ 1,888,686
Debt Securities Other than Securities Pledged
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less	32,943
Due after one year through five years	3,331
Due after five years through ten years	0
Due after ten years	41,024
Carrying value	77,298
Due in one year or less, Estimated fair value	32,943
Due after one year through five years, Estimated fair value	3,360
Due after five years through ten years, Estimated fair value	0
Due after ten years, Estimated fair value	78,474
Total, Estimated fair value	$ 114,777

Securities (Investment Securiti

Securities (Investment Securities, Continuous Unrealized Loss Position And Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale, Estimated fair value
Less than 12 months	$ 137,801	$ 668,613
12 months or more	36,119	14,821
Total	173,920	683,434
Available-for-sale, Unrealized losses
Less than 12 months	544	5,472
12 months or more	173	449
Total	717	5,921
Held-to-maturity Securities, Estimated Fair Value
Less than 12 months	97,594	890,028
12 months or more	22,828	33,900
Total	120,422	923,928
Held-to-maturity Securities, Unrealized Losses
Less than 12 months	145	8,281
12 months or more	339	921
Total	484	9,202
Estimated fair value, Less than 12 months, Total	235,395	1,558,641
Unrealized losses, Less than 12 months, Total	689	13,753
Estimated fair value, 12 months or more, Total	58,947	48,721
Unrealized losses, 12 months or more, Total	512	1,370
Estimated fair value, Total	294,342	1,607,362
Unrealized losses, Total	1,201	15,123
Equity securities
Available-for-sale, Estimated fair value
Less than 12 months		4,692
12 months or more		0
Total		4,692
Available-for-sale, Unrealized losses
Less than 12 months		16
12 months or more		0
Total		16
Federal Home Loan Mortgage Corporation
Available-for-sale, Estimated fair value
Less than 12 months	99,570	263,255
12 months or more	0	0
Total	99,570	263,255
Available-for-sale, Unrealized losses
Less than 12 months	341	2,443
12 months or more	0	0
Total	341	2,443
Held-to-maturity Securities, Estimated Fair Value
Less than 12 months	32,543	342,702
12 months or more	4,599	4,887
Total	37,142	347,589
Held-to-maturity Securities, Unrealized Losses
Less than 12 months	33	2,804
12 months or more	192	278
Total	225	3,082
Federal National Mortgage Association
Available-for-sale, Estimated fair value
Less than 12 months	38,231	375,792
12 months or more	36,119	14,821
Total	74,350	390,613
Available-for-sale, Unrealized losses
Less than 12 months	203	2,850
12 months or more	173	449
Total	376	3,299
Held-to-maturity Securities, Estimated Fair Value
Less than 12 months	65,051
12 months or more	18,229
Total	83,280
Held-to-maturity Securities, Unrealized Losses
Less than 12 months	112
12 months or more	147
Total	$ 259
Government National Mortgage Association
Available-for-sale, Estimated fair value
Less than 12 months		24,874
12 months or more		0
Total		24,874
Available-for-sale, Unrealized losses
Less than 12 months		163
12 months or more		0
Total		163
Federal National Mortgage Association
Held-to-maturity Securities, Estimated Fair Value
Less than 12 months		547,326
12 months or more		29,013
Total		576,339
Held-to-maturity Securities, Unrealized Losses
Less than 12 months		5,477
12 months or more		643
Total		6,120
Mortgage-backed securities:
Available-for-sale, Estimated fair value
Less than 12 months		663,921
12 months or more		14,821
Total		678,742
Available-for-sale, Unrealized losses
Less than 12 months		5,456
12 months or more		449
Total		5,905
Held-to-maturity Securities, Estimated Fair Value
Less than 12 months		890,028
12 months or more		33,900
Total		923,928
Held-to-maturity Securities, Unrealized Losses
Less than 12 months		8,281
12 months or more		921
Total		$ 9,202

Securities (Changes in Credit L

Securities (Changes in Credit Loss Component of the Impairment Loss of Debt Securities for Other-than-Temporary Impairment Recognized in Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Balance of credit related OTTI, beginning of period	$ 100,200	$ 108,817
Initial credit impairments	0	0
Subsequent credit impairments	0	0
Accretion of credit loss impairment due to an increase in expected cash flows	(1,112)	(973)
Balance of credit related OTTI, end of period	$ 99,088	$ 107,844

Loans Receivable, Net (Narrativ

Loans Receivable, Net (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016USD ($)loan	Mar. 31, 2015USD ($)loan	Dec. 31, 2015USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans acquired	$ 20,000
Outstanding minimum balance of loans that are evaluated for impairment individually	$ 1,000,000
Residential mortgage loans, appraisal update period, years	2 years
Loans that are 90 days past due and still accruing			$ 0
PCI loans	$ 11,329,000		11,089,000
Loans, Individually evaluated for impairment	40,938,000		56,987,000
Related Allowance	1,352,000		4,191,000
Interest income received and recognized on loans	393,000	$ 667,000
Allowance for loan losses, individually evaluated for impairment	$ 1,352,000		$ 4,191,000
Troubled debt restructured, number of loans | loan	101		104
Recorded investment	$ 34,251,000		$ 47,439,000
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period in days	90 days
Substandard Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period in days	90 days
Collateral Dependant TDRs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Related Allowance	$ 1,400,000		4,200,000
Allowance for loan losses, individually evaluated for impairment	$ 1,400,000		1,800,000
Maximum | Special Mention Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period in days	89 days
Minimum | Special Mention Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period in days	60 days
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Individually evaluated for impairment	$ 4,807,000		9,395,000
Related Allowance	0		2,409,000
Allowance for loan losses, individually evaluated for impairment	$ 0		$ 2,409,000
Troubled debt restructured, number of loans | loan	3		4
Recorded investment	$ 2,553,000		$ 3,226,000
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Individually evaluated for impairment	22,954,000		22,539,000
Allowance for loan losses, individually evaluated for impairment	$ 1,344,000		$ 1,773,000
Troubled debt restructured, number of loans | loan	87		81
Recorded investment	$ 23,323,000		$ 22,928,000
Loans modified as TDR in the last 12 months for which there was a default payment | loan	4	2
Recorded investment	$ 880,000,000	$ 1,100,000
Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Individually evaluated for impairment	8,659,000		18,941,000
Related Allowance	0		0
Allowance for loan losses, individually evaluated for impairment	$ 0		$ 0
Troubled debt restructured, number of loans | loan	9		14
Recorded investment	$ 7,227,000		$ 18,987,000
Construction Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Individually evaluated for impairment	1,486,000		2,504,000
Related Allowance	0		0
Allowance for loan losses, individually evaluated for impairment	$ 0		$ 0
Troubled debt restructured, number of loans | loan	1		3
Recorded investment	$ 132,000		$ 718,000
Loans modified as TDR in the last 12 months for which there was a default payment | loan	1
Recorded investment	$ 132,000
Commercial Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding minimum balance of loans to be evaluated for impairment individually	1,000,000
Outstanding minimum balance of loans that are evaluated for impairment individually	1,000,000
Related Allowance	$ 0		$ 2,409,000
Troubled debt restructured, number of loans | loan	14		23
Recorded investment	$ 10,928,000		$ 24,511,000
Loans modified as TDR in the last 12 months for which there was a default payment | loan	3
Recorded investment	$ 246,000
Commercial Real Estate Construction And Multi Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding minimum balance of loans to be evaluated for impairment individually	500,000
Outstanding minimum balance of loans that are evaluated for impairment individually	$ 2,000,000
PCI Loans | Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructured, number of loans | loan	2	3
Marathon Banking Corporation and Marathon National Bank of New York | PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	$ 11,300,000		11,100,000
Financing Receivables, 1 to 29 Days Past Due [Member] | Upto 90 Days | Marathon Banking Corporation and Marathon National Bank of New York | PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	7,900,000		9,000,000
Financing Receivables, 30 to 89 Days Past Due [Member] | Upto 90 Days | Marathon Banking Corporation and Marathon National Bank of New York | PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	1,400,000
Greater than 90 Days | Upto 90 Days | Marathon Banking Corporation and Marathon National Bank of New York | PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	$ 2,000,000		$ 2,100,000

Loans Receivable, Net (Details)

Loans Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Multi-family loans	$ 6,521,998	$ 6,255,904
Commercial real estate loans	3,890,839	3,821,950
Commercial and industrial loans	1,052,139	1,044,329
Construction loans	237,334	224,057
Total commercial loans	11,702,310	11,346,240
Residential mortgage loans	4,927,653	5,037,898
Consumer and other loans	511,893	496,103
Total loans excluding PCI loans	17,141,856	16,880,241
PCI loans	11,329	11,089
Net unamortized premiums and deferred loan costs	(13,845)	(11,692)
Allowance for loan losses	(216,613)	(218,505)	$ (208,181)	$ (200,284)
Net loans	$ 16,922,727	$ 16,661,133

Loans Receivable, Net (Purchase

Loans Receivable, Net (Purchased Credit Impaired Loans) (Details) - PCI Loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accretable Yeild [Roll Forward]
Balance, beginning of period	$ 449	$ 971
Acquisitions	0	0
Accretion	(67)	(116)
Net reclassification from non-accretable difference	1,221	0
Balance, ending of period	$ 1,603	$ 855

Loans Receivable, Net (Summary

Loans Receivable, Net (Summary of Analysis of the Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of the period	$ 218,505	$ 200,284
Loans charged off	(7,977)	(1,899)
Recoveries	1,085	796
Net charge-offs	(6,892)	(1,103)
Provision for loan losses	5,000	9,000
Balance at end of the period	$ 216,613	$ 208,181

Loans Receivable, Net (Summar44

Loans Receivable, Net (Summary of Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment And Based On Impairment Method) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	$ 218,505	$ 200,284
Allowance for loan losses, Charge-offs	(7,977)	(12,216)
Allowance for loan losses, Recoveries	1,085	4,437
Allowance for loan losses, Provision	5,000	26,000
Allowance for loan losses, Ending balance	216,613	218,505
Allowance for loan losses, individually evaluated for impairment	1,352	4,191
Allowance for loan losses, collectively evaluated for impairment	215,261	214,314
Loans, Individually evaluated for impairment	40,938	56,987
Loans, Collectively evaluated for impairment	17,100,918	16,823,254
Loan, Loans acquired with deteriorated credit quality	17,141,856	16,880,241
Ending Balance	17,153,185	16,891,330
Multi- Family Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	88,223	71,147
Allowance for loan losses, Charge-offs	(10)	(284)
Allowance for loan losses, Recoveries	491	445
Allowance for loan losses, Provision	1,898	16,915
Allowance for loan losses, Ending balance	90,602	88,223
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	90,602	88,223
Loans, Individually evaluated for impairment	2,664	3,219
Loans, Collectively evaluated for impairment	6,519,334	6,252,685
Loan, Loans acquired with deteriorated credit quality	6,521,998	6,255,904
Ending Balance	6,521,998	6,255,904
Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	46,999	44,030
Allowance for loan losses, Charge-offs	(194)	(1,021)
Allowance for loan losses, Recoveries	170	807
Allowance for loan losses, Provision	1,875	3,183
Allowance for loan losses, Ending balance	48,850	46,999
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	48,850	46,999
Loans, Individually evaluated for impairment	8,659	18,941
Loans, Collectively evaluated for impairment	3,882,180	3,803,009
Loan, Loans acquired with deteriorated credit quality	3,890,839	3,821,950
Ending Balance	3,898,739	3,829,099
Commercial and Industrial Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	40,585	20,759
Allowance for loan losses, Charge-offs	(3,966)	(516)
Allowance for loan losses, Recoveries	18	295
Allowance for loan losses, Provision	2,567	20,047
Allowance for loan losses, Ending balance	39,204	40,585
Allowance for loan losses, individually evaluated for impairment	0	2,409
Allowance for loan losses, collectively evaluated for impairment	39,204	38,176
Loans, Individually evaluated for impairment	4,807	9,395
Loans, Collectively evaluated for impairment	1,047,332	1,034,934
Loan, Loans acquired with deteriorated credit quality	1,052,139	1,044,329
Ending Balance	1,052,194	1,044,385
Construction Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	6,794	6,488
Allowance for loan losses, Charge-offs	(8)	(466)
Allowance for loan losses, Recoveries	100	317
Allowance for loan losses, Provision	(1,267)	455
Allowance for loan losses, Ending balance	5,619	6,794
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	5,619	6,794
Loans, Individually evaluated for impairment	1,486	2,504
Loans, Collectively evaluated for impairment	235,848	221,553
Loan, Loans acquired with deteriorated credit quality	237,334	224,057
Ending Balance	238,688	225,843
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	31,443	47,936
Allowance for loan losses, Charge-offs	(3,622)	(9,526)
Allowance for loan losses, Recoveries	287	2,295
Allowance for loan losses, Provision	516	(9,262)
Allowance for loan losses, Ending balance	28,624	31,443
Allowance for loan losses, individually evaluated for impairment	1,344	1,773
Allowance for loan losses, collectively evaluated for impairment	27,280	29,670
Loans, Individually evaluated for impairment	22,954	22,539
Loans, Collectively evaluated for impairment	4,904,699	5,015,359
Loan, Loans acquired with deteriorated credit quality	4,927,653	5,037,898
Ending Balance	4,929,276	5,039,543
Consumer and Other Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	3,155	3,347
Allowance for loan losses, Charge-offs	(177)	(403)
Allowance for loan losses, Recoveries	19	278
Allowance for loan losses, Provision	(390)	(67)
Allowance for loan losses, Ending balance	2,607	3,155
Allowance for loan losses, individually evaluated for impairment	8	9
Allowance for loan losses, collectively evaluated for impairment	2,599	3,146
Loans, Individually evaluated for impairment	368	389
Loans, Collectively evaluated for impairment	511,525	495,714
Loan, Loans acquired with deteriorated credit quality	511,893	496,103
Ending Balance	512,290	496,556
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	1,306	6,577
Allowance for loan losses, Charge-offs	0	0
Allowance for loan losses, Recoveries	0	0
Allowance for loan losses, Provision	(199)	(5,271)
Allowance for loan losses, Ending balance	1,107	1,306
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	1,107	1,306
Loans, Individually evaluated for impairment	0	0
Loans, Collectively evaluated for impairment	0	0
Ending Balance	0	0
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	0
Allowance for loan losses, Ending balance	0	0
Loan, Loans acquired with deteriorated credit quality	11,329	11,089
Receivables Acquired with Deteriorated Credit Quality | Multi- Family Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	0
Allowance for loan losses, Ending balance	0	0
Loan, Loans acquired with deteriorated credit quality	0	0
Receivables Acquired with Deteriorated Credit Quality | Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	0
Allowance for loan losses, Ending balance	0	0
Loan, Loans acquired with deteriorated credit quality	7,900	7,149
Receivables Acquired with Deteriorated Credit Quality | Commercial and Industrial Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	0
Allowance for loan losses, Ending balance	0	0
Loan, Loans acquired with deteriorated credit quality	55	56
Receivables Acquired with Deteriorated Credit Quality | Construction Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	0
Allowance for loan losses, Ending balance	0	0
Loan, Loans acquired with deteriorated credit quality	1,354	1,786
Receivables Acquired with Deteriorated Credit Quality | Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	0
Allowance for loan losses, Ending balance	0	0
Loan, Loans acquired with deteriorated credit quality	1,623	1,645
Receivables Acquired with Deteriorated Credit Quality | Consumer and Other Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	0
Allowance for loan losses, Ending balance	0	0
Loan, Loans acquired with deteriorated credit quality	397	453
Receivables Acquired with Deteriorated Credit Quality | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	0
Allowance for loan losses, Ending balance	0	0
Loan, Loans acquired with deteriorated credit quality	$ 0	$ 0

Loans Receivable, Net (Schedule

Loans Receivable, Net (Schedule of Risk Category of Loans by Class of Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	$ 17,141,856	$ 16,880,241
Commercial Loan
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	11,702,310	11,346,240
Multi- Family Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	6,521,998	6,255,904
Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	3,890,839	3,821,950
Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	1,052,139	1,044,329
Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	237,334	224,057
Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	4,927,653	5,037,898
Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	511,893	496,103
Pass
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	15,909,233	15,703,003
Pass | Commercial Loan
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	10,591,194	10,289,327
Pass | Multi- Family Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	6,098,911	5,876,425
Pass | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	3,476,202	3,411,876
Pass | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	801,245	793,527
Pass | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	214,836	207,499
Pass | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	4,816,324	4,930,961
Pass | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	501,715	482,715
Watch
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	907,935	921,721
Watch | Commercial Loan
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	874,958	893,150
Watch | Multi- Family Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	293,468	325,414
Watch | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	343,770	331,429
Watch | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	220,093	223,474
Watch | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	17,627	12,833
Watch | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	30,745	24,584
Watch | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	2,232	3,987
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	176,189	83,303
Special Mention | Commercial Loan
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	158,300	69,080
Special Mention | Multi- Family Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	90,408	17,033
Special Mention | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	43,434	38,265
Special Mention | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	23,258	13,782
Special Mention | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	1,200	0
Special Mention | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	16,825	13,796
Special Mention | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	1,064	427
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	148,499	172,214
Substandard | Commercial Loan
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	77,858	94,683
Substandard | Multi- Family Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	39,211	37,032
Substandard | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	27,433	40,380
Substandard | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	7,543	13,546
Substandard | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	3,671	3,725
Substandard | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	63,759	68,557
Substandard | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	6,882	8,974
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Doubtful | Commercial Loan
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Doubtful | Multi- Family Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Doubtful | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Doubtful | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Doubtful | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality		0
Doubtful | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Doubtful | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Loss
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Loss | Commercial Loan
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Loss | Multi- Family Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Loss | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Loss | Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Loss | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality		0
Loss | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Loss | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	$ 0	$ 0

Loans Receivable, Net (Payment

Loans Receivable, Net (Payment Status of the Recorded Investment in Past Due Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 182,267	$ 157,207
Current	16,959,589	16,723,034
Total Loans Receivable	17,141,856	16,880,241
Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	60,760	33,209
Current	11,641,550	11,313,031
Total Loans Receivable	11,702,310	11,346,240
Multi- Family Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19,849	16,122
Current	6,502,149	6,239,782
Total Loans Receivable	6,521,998	6,255,904
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	33,223	10,952
Current	3,857,616	3,810,998
Total Loans Receivable	3,890,839	3,821,950
Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,172	5,343
Current	1,044,967	1,038,986
Total Loans Receivable	1,052,139	1,044,329
Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	516	792
Current	236,818	223,265
Total Loans Receivable	237,334	224,057
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	111,329	110,608
Current	4,816,324	4,927,290
Total Loans Receivable	4,927,653	5,037,898
Consumer and Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,178	13,390
Current	501,715	482,713
Total Loans Receivable	511,893	496,103
30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	80,406	50,443
30-59 Days | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	47,429	19,364
30-59 Days | Multi- Family Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	17,963	14,236
30-59 Days | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	25,370	4,171
30-59 Days | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,096	957
30-59 Days | Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
30-59 Days | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	30,745	27,092
30-59 Days | Consumer and Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,232	3,987
60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20,608	15,735
60-89 Days | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,719	352
60-89 Days | Multi- Family Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
60-89 Days | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	423	352
60-89 Days | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,296	0
60-89 Days | Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
60-89 Days | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	16,825	14,956
60-89 Days | Consumer and Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,064	427
Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	81,253	91,029
Greater than 90 Days | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,612	13,493
Greater than 90 Days | Multi- Family Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,886	1,886
Greater than 90 Days | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,430	6,429
Greater than 90 Days | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	780	4,386
Greater than 90 Days | Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	516	792
Greater than 90 Days | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	63,759	68,560
Greater than 90 Days | Consumer and Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 6,882	$ 8,976

Loans Receivable, Net (Non-Accr

Loans Receivable, Net (Non-Accrual Loans Status) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016USD ($)loan	Dec. 31, 2015USD ($)loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	539	562
Non-accrual, Amount | $	$ 105,240	$ 115,426
Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	51	62
Non-accrual, Amount | $	$ 19,348	$ 24,304
Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	3	4
Non-accrual, Amount | $	$ 516	$ 792
Multi- Family Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	3	4
Non-accrual, Amount | $	$ 2,903	$ 3,467
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	35	37
Non-accrual, Amount | $	$ 10,342	$ 10,820
Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	10	17
Non-accrual, Amount | $	$ 5,587	$ 9,225
Residential mortgage and consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	488	500
Non-accrual, Amount | $	$ 85,892	$ 91,122
Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	17	18
Non-accrual, Amount | $	$ 6,071	$ 6,555
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	3	7
Non-accrual, Amount | $	$ 586	$ 3,217
Financing Receivables, 30 to 89 Days Past Due [Member] | Multi- Family Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	0	1
Non-accrual, Amount | $	$ 0	$ 548
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	2	5
Non-accrual, Amount | $	$ 241	$ 2,309
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	1	1
Non-accrual, Amount | $	$ 345	$ 360
Financing Receivables, 30 to 89 Days Past Due [Member] | Residential mortgage and consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	14	11
Non-accrual, Amount | $	$ 5,485	$ 3,338
Financing Receivables, 1 to 29 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	24	20
Non-accrual, Amount | $	$ 6,610	$ 6,876
Financing Receivables, 1 to 29 Days Past Due [Member] | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	6	5
Non-accrual, Amount | $	$ 3,630	$ 3,498
Financing Receivables, 1 to 29 Days Past Due [Member] | Multi- Family Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	1	1
Non-accrual, Amount | $	$ 1,016	$ 1,032
Financing Receivables, 1 to 29 Days Past Due [Member] | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	3	2
Non-accrual, Amount | $	$ 406	$ 240
Financing Receivables, 1 to 29 Days Past Due [Member] | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	2	2
Non-accrual, Amount | $	$ 2,208	$ 2,226
Financing Receivables, 1 to 29 Days Past Due [Member] | Residential mortgage and consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	18	15
Non-accrual, Amount | $	$ 2,980	$ 3,378

Loans Receivable, Net (Loans In

Loans Receivable, Net (Loans Individually Evaluated for Impairment by Class of Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Recorded Investment
Total:	$ 40,938	$ 56,987
Unpaid Principal Balance
Total:	64,262	76,738
Related Allowance	1,352	4,191
Average Recorded Investment
Total:	40,397	58,184
Interest Income Recognized
Total:	393	2,814
Multi- Family Loans
Recorded Investment
With no related allowance:	2,664	3,219
With an allowance recorded:	0	0
Total:	2,664	3,219
Unpaid Principal Balance
With no related allowance:	5,791	6,806
With an allowance recorded:	0	0
Total:	5,791	6,806
Related Allowance	0	0
Average Recorded Investment
With no related allowance:	2,144	2,872
With an allowance recorded:	0	0
Total:	2,144	2,872
Interest Income Recognized
With no related allowance:	14	119
With an allowance recorded:	0	0
Total:	14	119
Commercial Real Estate Loans
Recorded Investment
With no related allowance:	8,659	18,941
With an allowance recorded:	0	0
Total:	8,659	18,941
Unpaid Principal Balance
With no related allowance:	17,762	27,961
With an allowance recorded:	0	0
Total:	17,762	27,961
Related Allowance	0	0
Average Recorded Investment
With no related allowance:	8,096	19,025
With an allowance recorded:	0	0
Total:	8,096	19,025
Interest Income Recognized
With no related allowance:	108	1,136
With an allowance recorded:	0	0
Total:	108	1,136
Commercial and Industrial Loans
Recorded Investment
With no related allowance:	4,807	5,155
With an allowance recorded:	0	4,240
Total:	4,807	9,395
Unpaid Principal Balance
With no related allowance:	8,761	5,160
With an allowance recorded:	0	4,271
Total:	8,761	9,431
Related Allowance	0	2,409
Average Recorded Investment
With no related allowance:	3,362	3,575
With an allowance recorded:	0	4,389
Total:	3,362	7,964
Interest Income Recognized
With no related allowance:	32	200
With an allowance recorded:	0	194
Total:	32	394
Construction Loans
Recorded Investment
With no related allowance:	1,486	2,504
With an allowance recorded:	0	0
Total:	1,486	2,504
Unpaid Principal Balance
With no related allowance:	5,324	6,412
With an allowance recorded:	0	0
Total:	5,324	6,412
Related Allowance	0	0
Average Recorded Investment
With no related allowance:	2,795	4,288
With an allowance recorded:	0	0
Total:	2,795	4,288
Interest Income Recognized
With no related allowance:	12	226
With an allowance recorded:	0	0
Total:	12	226
Commercial Loan
Recorded Investment
With no related allowance:	17,616	29,819
With an allowance recorded:	0	4,240
Total:	17,616	34,059
Unpaid Principal Balance
With no related allowance:	37,638	46,339
With an allowance recorded:	0	4,271
Total:	37,638	50,610
Related Allowance	0	2,409
Average Recorded Investment
With no related allowance:	16,397	29,760
With an allowance recorded:	0	4,389
Total:	16,397	34,149
Interest Income Recognized
With no related allowance:	166	1,681
With an allowance recorded:	0	194
Total:	166	1,875
Residential mortgage and consumer
Recorded Investment
With no related allowance:	9,653	8,020
With an allowance recorded:	13,669	14,908
Total:	23,322	22,928
Unpaid Principal Balance
With no related allowance:	12,601	12,433
With an allowance recorded:	14,023	13,695
Total:	26,624	26,128
Related Allowance	1,352	1,782
Average Recorded Investment
With no related allowance:	8,191	7,611
With an allowance recorded:	15,809	16,424
Total:	24,000	24,035
Interest Income Recognized
With no related allowance:	113	463
With an allowance recorded:	114	476
Total:	$ 227	$ 939

Loans Receivable, Net (Troubled

Loans Receivable, Net (Troubled Debt Restructured Loans) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016USD ($)loan	Dec. 31, 2015USD ($)loan
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	30	39
Accrual, amount | $	$ 10,667	$ 22,489
Non-accrual, number of loans | loan	71	65
Non-accrual, amount | $	$ 23,584	$ 24,950
Troubled debt restructured, number of loans | loan	101	104
Troubled debt restructuring, Amount | $	$ 34,251	$ 47,439
Multi- Family Loans
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	0	0
Accrual, amount | $	$ 0	$ 0
Non-accrual, number of loans | loan	1	2
Non-accrual, amount | $	$ 1,016	$ 1,580
Troubled debt restructured, number of loans | loan	1	2
Troubled debt restructuring, Amount | $	$ 1,016	$ 1,580
Commercial Real Estate Loans
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	2	5
Accrual, amount | $	$ 3,476	$ 13,161
Non-accrual, number of loans | loan	7	9
Non-accrual, amount | $	$ 3,751	$ 5,826
Troubled debt restructured, number of loans | loan	9	14
Troubled debt restructuring, Amount | $	$ 7,227	$ 18,987
Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	0	1
Accrual, amount | $	$ 0	$ 640
Non-accrual, number of loans | loan	3	3
Non-accrual, amount | $	$ 2,553	$ 2,586
Troubled debt restructured, number of loans | loan	3	4
Troubled debt restructuring, Amount | $	$ 2,553	$ 3,226
Construction Loans
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	0	1
Accrual, amount | $	$ 0	$ 313
Non-accrual, number of loans | loan	1	2
Non-accrual, amount | $	$ 132	$ 405
Troubled debt restructured, number of loans | loan	1	3
Troubled debt restructuring, Amount | $	$ 132	$ 718
Commercial Loan
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	2	7
Accrual, amount | $	$ 3,476	$ 14,114
Non-accrual, number of loans | loan	12	16
Non-accrual, amount | $	$ 7,452	$ 10,397
Troubled debt restructured, number of loans | loan	14	23
Troubled debt restructuring, Amount | $	$ 10,928	$ 24,511
Residential Mortgage Loans
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	28	32
Accrual, amount | $	$ 7,191	$ 8,375
Non-accrual, number of loans | loan	59	49
Non-accrual, amount | $	$ 16,132	$ 14,553
Troubled debt restructured, number of loans | loan	87	81
Troubled debt restructuring, Amount | $	$ 23,323	$ 22,928

Loans Receivable, Net (Schedu50

Loans Receivable, Net (Schedule Of Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)loan	Mar. 31, 2015USD ($)loan
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of Loans | loan	7	7
Pre-modification Recorded Investment | $	$ 958	$ 1,542
Post- modification Recorded Investment | $	$ 958	$ 1,542
Number of Loans | loan	7	7
Pre-modification Interest Yield	6.05%	4.84%
Post- modification Interest Yield	3.99%	3.36%
Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of Loans | loan	2	0
Pre-modification Recorded Investment | $	$ 442	$ 0
Post- modification Recorded Investment | $	$ 442	$ 0
Number of Loans | loan	2	0
Pre-modification Interest Yield	4.12%	0.00%
Post- modification Interest Yield	4.44%	0.00%
Construction Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of Loans | loan	0	1
Pre-modification Recorded Investment | $	$ 0	$ 1,326
Post- modification Recorded Investment | $	$ 0	$ 1,326
Number of Loans | loan	0	1
Pre-modification Interest Yield	0.00%	5.00%
Post- modification Interest Yield	0.00%	5.00%

Deposits (Summary of Deposits)

Deposits (Summary of Deposits) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Banking and Thrift [Abstract]
Checking accounts	$ 4,857,958	$ 4,636,025
Money market deposits	3,837,226	3,861,317
Savings	2,082,122	2,150,004
Total transaction accounts	10,777,306	10,647,346
Certificates of deposit	3,424,081	3,416,310
Total deposits	$ 14,201,387	$ 14,063,656

Goodwill and Intangible Asset52

Goodwill and Intangible Assets Summary of Other Intangible Assets(Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	$ 53,544	$ 48,769
Accumulated Amortization	(26,034)	(20,908)
Valuation Allowance	(121)	(121)
Net Intangible Assets	27,389	27,740
Goodwill	77,571	77,571
Intangible Assets, Net (Including Goodwill)	104,960	105,311
Mortgage servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	27,335	23,411
Accumulated Amortization	(11,411)	(7,042)
Valuation Allowance	(121)	(121)
Net Intangible Assets	15,803	16,248
Core deposit premiums
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	25,059	25,058
Accumulated Amortization	(14,466)	(13,726)
Valuation Allowance	0	0
Net Intangible Assets	10,593	11,332
Other
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	1,150	300
Accumulated Amortization	(157)	(140)
Valuation Allowance	0	0
Net Intangible Assets	$ 993	$ 160

Goodwill and Intangible Asset53

Goodwill and Intangible Assets Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 77,571	$ 77,571
Loans sold	2,080,000	2,120,000
Estimated fair value of servicing asset in intangible assets	$ 15,800	$ 16,200
Weighted average discount rate of servicing assets	10.20%
Weighted average constant prepayment rate on mortgages	12.24%
Weighted average life of servicing assets, years	6 years 2 months 5 days
Core deposit premiums
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years

Equity Incentive Plan (Narrativ

Equity Incentive Plan (Narrative) (Details) - USD ($) $ in Millions	Jun. 23, 2015	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)		90,000
Compensation not yet recognized		$ 31.6
Compensation cost not yet recognized, period for recognition (in years)		5 years 6 months
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)		161,890
Compensation cost not yet recognized, period for recognition, restricted stock (in years)		$ 76.4
Compensation cost not yet recognized, period for recognition (in years)		5 years 5 months 9 days
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (shares)	30,881,296
2015 Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (shares)	13,234,841
2015 Plan | Equity Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (shares)	17,646,455
Expiration period (in years)	10 years
Minimum | 2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	5 years
Maximum | 2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	7 years

Equity Incentive Plan (Assumpti

Equity Incentive Plan (Assumptions) (Details)	3 Months Ended
	Mar. 31, 2016$ / shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted average expected life (in years)	6 years 6 months
Risk-free rate of return (percentage)	1.90%
Volatility (percentage)	24.06%
Dividend yield (percentage)	1.80%
Weighted average fair value of options granted (usd per share)	$ 2.93

(Shares-based compensation expe

(Shares-based compensation expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock option expense	$ 1,380	$ 4
Restricted stock expense	2,953	0
Total share based compensation expense	$ 4,333	$ 4

(Summary of Stock Option Activi

(Summary of Stock Option Activity and Related Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Number of Stock Options
Outstanding at December 31, 2015 (shares)	18,804,816
Granted (shares)	90,000
Exercised (shares)	(641,322)
Forfeited (shares)	(25,382)
Expired (shares)	0
Outstanding at March 31, 2016 (shares)	18,228,112	18,804,816
Exercisable at March 31, 2016 (shares)	6,724,865
Weighted Average Exercise Price
Beginning balance (usd per share)	$ 10
Granted (usd per share)	11.67
Exercised (usd per share)	5.98
Forfeited (usd per share)	12.54
Expired (usd per share)	0
Ending balance (usd per share)	10.15	$ 10
Exercisable end of the year (usd per share)	$ 6.07
Outstanding, Weighted Average Remaining Contractual Life (in years)	6 years 8 months 12 days	6 years 9 months 18 days
Granted, Weighted Average Remaining Contractual Life (in years)	9 years 9 months 18 days
Exercised, Weighted Average Remaining Contractual Life (in years)	7 months 6 days
Aggregate Intrinsic Value, Outstanding	$ 37,491	$ 46,996
Aggregate Intrinsic Value, Exercisable	$ 37,452
Weighted Average Remaining Contractual Life, Exercisable Ending Balance (in years)	1 year 8 months 12 days

Equity Incentive Plan (Restrict

Equity Incentive Plan (Restricted Stock) (Details) - Restricted Stock	3 Months Ended
	Mar. 31, 2016$ / sharesshares
Number of Shares Awarded
Beginning balance (shares) | shares	6,759,832
Granted (shares) | shares	161,890
Vested (shares) | shares	0
Forfeited (shares) | shares	0
Ending balance (shares) | shares	6,921,722
Weighted Average Exercise Price
Beginning balance (usd per share) | $ / shares	$ 12.64
Granted (usd per share) | $ / shares	11.53
Vested (usd per share) | $ / shares	0
Forfeited (usd per share) | $ / shares	0
Ending balance (usd per share) | $ / shares	$ 12.52

Net Periodic Benefit Plan Exp59

Net Periodic Benefit Plan Expense (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 894,000	$ 774,000
Interest cost	474,000	374,000
Prior service cost	0	12,000
Net gain	536,000	321,000
Total net periodic benefit cost	1,904,000	$ 1,481,000
Contribution and pension cost	$ 0

Comprehensive Income (Component

Comprehensive Income (Components of Comprehensive Income (Loss), Gross and Net Of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Net income, Gross	$ 71,124	$ 67,066
Net income, Tax	(27,498)	(25,119)
Net income	43,626	41,947
Change in funded status of retirement obligations, Gross	536	352
Change in funded status of retirement obligations, Tax	(219)	(144)
Change in funded status of retirement obligations	317	208
Unrealized gain on securities available-for-sale, Gross	16,500	8,365
Unrealized gain on securities available-for-sale, Tax	(6,498)	(3,272)
Unrealized gain on securities available-for-sale	10,002	5,093
Accretion of loss on securities reclassified to held to maturity, Gross	480	641
Accretion of loss on securities reclassified to held to maturity, Tax	(196)	(262)
Accretion of loss on securities reclassified to held to maturity	284	379
Reclassification adjustments for losses included in net income, Gross	(1,388)	0
Reclassification adjustments for losses included in net income, Tax	555	0
Reclassification adjustment for losses Included in net income	(833)	0
Other-than-temporary impairment accretion on debt securities, Gross	322	329
Other-than-temporary impairment accretion on debt securities, Tax	(131)	(133)
Other-than-temporary impairment accretion on debt securities	191	196
Total other comprehensive income (loss), Gross	16,450	9,687
Total other comprehensive income (loss), Tax	(6,489)	(3,811)
Total other comprehensive income (loss)	9,961	5,876
Total comprehensive income, Gross	87,574	76,753
Total comprehensive income, Tax	(33,987)	(28,930)
Total comprehensive income	$ 53,587	$ 47,823

Comprehensive Income (Compone61

Comprehensive Income (Component of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, Beginning Balance	$ (27,825)	$ (22,404)
Total accumulated other comprehensive loss, Net change	9,961	5,876
Total accumulated other comprehensive loss, Ending Balance	(17,864)	(16,528)
Change in funded status of retirement obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, Beginning Balance	(12,366)	(10,911)
Total accumulated other comprehensive loss, Net change	317	208
Total accumulated other comprehensive loss, Ending Balance	(12,049)	(10,703)
Accretion of loss on securities reclassified to held to maturity
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, Beginning Balance	(3,080)	(4,528)
Total accumulated other comprehensive loss, Net change	284	379
Total accumulated other comprehensive loss, Ending Balance	(2,796)	(4,149)
Unrealized gain on securities available-for-sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, Beginning Balance	2,918	7,851
Total accumulated other comprehensive loss, Net change	10,002	5,093
Total accumulated other comprehensive loss, Ending Balance	12,920	12,944
Reclassification adjustment for gains included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, Beginning Balance	(1,547)	0
Total accumulated other comprehensive loss, Net change	(833)
Total accumulated other comprehensive loss, Ending Balance	(2,380)	0
Other-than- temporary impairment accretion on debt securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, Beginning Balance	(13,750)	(14,816)
Total accumulated other comprehensive loss, Net change	191	196
Total accumulated other comprehensive loss, Ending Balance	$ (13,559)	$ (14,620)

Comprehensive Income (Reclassif

Comprehensive Income (Reclassification Adjustment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Compensation and fringe benefits	$ 51,817	$ 43,332
Income tax expense (benefit)	(27,498)	(25,119)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(852)	352
Income tax expense (benefit)	336	(144)
Income before undistributed earnings of subsidiary	(516)	208
Unrealized gain on securities available-for-sale | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on security transactions	(1,388)	0
Change in funded status of retirement obligations | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of net obligation or asset	0	0
Amortization of prior service cost	0	12
Amortization of net gain	536	340
Compensation and fringe benefits	$ 536	$ 352

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding minimum balance of loans that are evaluated for impairment individually	$ 1,000,000
Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	10.20%	10.20%
Mortgage servicing rights | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Prepayment range	26.28%	26.28%
Mortgage servicing rights | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Prepayment range	1.71%	6.30%
Loans Receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding minimum balance of loans to be evaluated for impairment individually	$ 1,000,000
Loans Receivable | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	25.00%
Loans Receivable | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.00%
Other Real Estate Owned | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	25.00%
Other Real Estate Owned | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.00%

Fair Value Measurements (Carryi

Fair Value Measurements (Carrying Value of Our Assets Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	$ 1,311,532	$ 1,304,697
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	6,523	6,495
Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	1,305,009	1,298,202
Federal Home Loan Mortgage Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	546,988	547,451
Federal National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	734,312	726,072
Government National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	23,709	24,679
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	1,311,532	1,304,697
Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	6,523	6,495
Fair Value, Measurements, Recurring | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	1,305,009	1,298,202
Fair Value, Measurements, Recurring | Federal Home Loan Mortgage Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	546,988	547,451
Fair Value, Measurements, Recurring | Federal National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	734,312	726,072
Fair Value, Measurements, Recurring | Government National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	23,709	24,679
Level 1 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	6,523	6,495
Level 1 | Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	6,523	6,495
Level 1 | Fair Value, Measurements, Recurring | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | Federal Home Loan Mortgage Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | Federal National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | Government National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	0	0
Level 2 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	1,305,009	1,298,202
Level 2 | Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	0	0
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	1,305,009	1,298,202
Level 2 | Fair Value, Measurements, Recurring | Federal Home Loan Mortgage Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	546,988	547,451
Level 2 | Fair Value, Measurements, Recurring | Federal National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	734,312	726,072
Level 2 | Fair Value, Measurements, Recurring | Government National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	23,709	24,679
Level 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	0	0
Level 3 | Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	0	0
Level 3 | Fair Value, Measurements, Recurring | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	0	0
Level 3 | Fair Value, Measurements, Recurring | Federal Home Loan Mortgage Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	0	0
Level 3 | Fair Value, Measurements, Recurring | Federal National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	0	0
Level 3 | Fair Value, Measurements, Recurring | Government National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	$ 0	$ 0

Fair Value Measurements (Carr65

Fair Value Measurements (Carrying Value of Our Assets Measured at Fair Value on a Non-Recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 116
Other real estate owned	146		$ 510
Total	262		510
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0
Other real estate owned	0		0
Total	0		0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0
Other real estate owned	0		0
Total	0		0
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	116
Other real estate owned	146		510
Total	$ 262		$ 510
Impaired Loans [Member] | Minimum
Fair Value Inputs [Abstract]
Probability of default		0.00%
Impaired Loans [Member] | Maximum
Fair Value Inputs [Abstract]
Probability of default		25.00%
Impaired Loans [Member] | Weighted Average
Fair Value Inputs [Abstract]
Probability of default	2.82%
Other Real Estate Owned | Minimum
Fair Value Inputs [Abstract]
Lack of marketability, range	0.00%	0.00%
Other Real Estate Owned | Maximum
Fair Value Inputs [Abstract]
Lack of marketability, range	25.00%	25.00%
Other Real Estate Owned | Weighted Average
Fair Value Inputs [Abstract]
Lack of marketability, range	8.54%		8.90%

Fair Value Measurements (Carr66

Fair Value Measurements (Carrying Amounts and Estimated Fair Values) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	$ 1,311,532	$ 1,304,697
Securities held-to-maturity, net (estimated fair value of $1,954,346 and $1,888,686 at March 31, 2016 and December 31, 2015, respectively)	1,954,346	1,888,686
Carrying value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	143,669	148,904
Securities available-for-sale	1,311,532	1,304,697
Securities held-to-maturity, net (estimated fair value of $1,954,346 and $1,888,686 at March 31, 2016 and December 31, 2015, respectively)	1,887,000	1,844,223
Stock in FHLB	190,240	178,437
Loans held for sale	3,852	7,431
Net loans	16,922,727	16,661,133
Deposits, other than time deposits	10,777,306	10,647,346
Time deposits	3,424,081	3,416,310
Borrowed funds	3,527,630	3,263,090
Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	143,669	148,904
Securities available-for-sale	1,311,532	1,304,697
Securities held-to-maturity, net (estimated fair value of $1,954,346 and $1,888,686 at March 31, 2016 and December 31, 2015, respectively)	1,954,346	1,888,686
Stock in FHLB	190,240	178,437
Loans held for sale	3,852	7,431
Net loans	16,946,062	16,650,529
Deposits, other than time deposits	10,777,306	10,647,346
Time deposits	3,427,225	3,414,528
Borrowed funds	3,585,648	3,277,983
Level 1 | Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	143,669	148,904
Securities available-for-sale	6,523	6,495
Securities held-to-maturity, net (estimated fair value of $1,954,346 and $1,888,686 at March 31, 2016 and December 31, 2015, respectively)	0	0
Stock in FHLB	190,240	178,437
Loans held for sale	0	0
Net loans	0	0
Deposits, other than time deposits	10,777,306	10,647,346
Time deposits	0	0
Borrowed funds	0	0
Level 2 | Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Securities available-for-sale	1,305,009	1,298,202
Securities held-to-maturity, net (estimated fair value of $1,954,346 and $1,888,686 at March 31, 2016 and December 31, 2015, respectively)	1,882,096	1,810,869
Stock in FHLB	0	0
Loans held for sale	3,852	7,431
Net loans	0	0
Deposits, other than time deposits	0	0
Time deposits	3,427,225	3,414,528
Borrowed funds	3,585,648	3,277,983
Level 3 | Estimated fair value
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, net (estimated fair value of $1,954,346 and $1,888,686 at March 31, 2016 and December 31, 2015, respectively)	72,250	77,817
Stock in FHLB	0	0
Loans held for sale	0	0
Net loans	16,946,062	16,650,529
Deposits, other than time deposits	0	0
Time deposits	0	0
Borrowed funds	$ 0	$ 0

Subsequent Event (Details)

Subsequent Event (Details) $ / shares in Units, $ in Thousands	May. 25, 2016$ / shares	May. 03, 2016$ / sharesshares	Apr. 28, 2016$ / sharesshares	Jun. 09, 2015	Mar. 16, 2015	Mar. 31, 2016USD ($)branch$ / shares	Mar. 31, 2015$ / shares	Dec. 31, 2015USD ($)
Subsequent Event [Line Items]
Percentage of shares to be repurchased (percentage)				10.00%	5.00%
Dividends paid per share (usd per share) | $ / shares						$ 0.06	$ 0.1
Assets						$ 21,189,970		$ 20,888,684
Loans						16,922,727		16,661,133
Deposits						14,201,387		$ 14,063,656
Subsequent Event
Subsequent Event [Line Items]
Percentage of shares to be repurchased (percentage)			10.00%
Shares to repurchased (shares) | shares			31,000,000
Dividends declared per share (usd per share) | $ / shares			$ 0.06
Scenario, Forecast | Subsequent Event
Subsequent Event [Line Items]
Dividends paid per share (usd per share) | $ / shares	$ 0.06
Bank of Princeton [Member] | Subsequent Event
Subsequent Event [Line Items]
Percentage of shares to be acquired for shares (percentage)		0.6
Percentage of shares to be acquired for cash (percentage)		40.00%
Shares received (shares) | shares		2.633
Common stock exchange, cash exchange for each share (usd per share) | $ / shares		$ 30.75
Bank of Princeton [Member]
Subsequent Event [Line Items]
Assets						1,000,000
Loans						842,000
Deposits						$ 820,000
NEW JERSEY
Subsequent Event [Line Items]
Number of branches | branch						10
Philadelphia [Member]
Subsequent Event [Line Items]
Number of branches | branch						3