Investors Bancorp (ISBC) 10-Q 10 May 17 2017 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 05, 2017
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, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		310,363,851

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 165,914	$ 164,178
Securities available-for-sale, at estimated fair value	1,767,260	1,660,433
Securities held-to-maturity, net (estimated fair value of $1,736,210 and $1,782,801 at March 31, 2017 and December 31, 2016, respectively)	1,704,406	1,755,556
Loans receivable, net	19,261,271	18,569,855
Loans held-for-sale	4,908	38,298
Federal Home Loan Bank stock	251,805	237,878
Accrued interest receivable	68,922	65,969
Other real estate owned	4,801	4,492
Office properties and equipment, net	179,196	177,417
Net deferred tax asset	216,183	222,277
Bank owned life insurance	153,063	161,940
Goodwill and intangible assets	101,475	101,839
Other assets	9,469	14,543
Total assets	23,888,673	23,174,675
Liabilities:
Deposits	15,376,023	15,280,833
Borrowed funds	5,093,790	4,546,251
Advance payments by borrowers for taxes and insurance	127,401	105,851
Other liabilities	132,967	118,495
Total liabilities	20,730,181	20,051,430
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, 2017 and December 31, 2016; 310,364,901 and 309,449,388 outstanding at March 31, 2017 and December 31, 2016, respectively	3,591	3,591
Additional paid-in capital	2,763,217	2,765,732
Retained earnings	1,075,909	1,053,750
Treasury stock, at cost; 48,705,951 and 49,621,464 shares at March 31, 2017 and December 31, 2016, respectively	(576,973)	(587,974)
Unallocated common stock held by the employee stock ownership plan	(86,505)	(87,254)
Accumulated other comprehensive loss	(20,747)	(24,600)
Total stockholders’ equity	3,158,492	3,123,245
Total liabilities and stockholders’ equity	$ 23,888,673	$ 23,174,675

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Estimated fair value	$ 1,736,210	$ 1,782,801
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	310,364,901	309,449,388
Treasury stock, shares	48,705,951	49,621,464

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest and dividend income:
Loans receivable and loans held-for-sale	$ 185,961	$ 172,832
Securities:
Equity	48	51
Government-sponsored enterprise obligations	8	11
Mortgage-backed securities	16,709	15,097
Municipal bonds and other debt	4,068	1,952
Interest-bearing deposits	107	104
Federal Home Loan Bank stock	3,193	2,060
Total interest and dividend income	210,094	192,107
Interest expense:
Deposits	22,184	20,725
Borrowed Funds	20,791	16,819
Total interest expense	42,975	37,544
Net interest income	167,119	154,563
Provision for loan losses	4,000	5,000
Net interest income after provision for loan losses	163,119	149,563
Non-interest income
Fees and service charges	4,928	4,180
Income on bank owned life insurance	725	1,260
Gain on loans, net	992	437
Gain on securities transactions, net	1,227	1,388
Gain (loss) on sale of other real estate owned, net	174	(233)
Other income	1,657	1,675
Total non-interest income	9,703	8,707
Non-interest expense
Compensation and fringe benefits	57,274	51,817
Advertising and promotional expense	2,085	1,694
Office occupancy and equipment expense	14,847	13,810
Federal deposit insurance premiums	3,710	2,400
General and administrative	734	817
Professional fees	7,421	4,013
Data processing and communication	5,860	5,561
Other operating expenses	7,627	7,034
Total non-interest expenses	99,558	87,146
Income before income tax expense	73,264	71,124
Income tax expense	27,244	26,455
Net income	$ 46,020	$ 44,669
Basic earnings per share (usd per share)	$ 0.16	$ 0.14
Diluted earnings per share (usd per share)	$ 0.16	$ 0.14
Weighted average shares outstanding
Basic (shares)	291,185,408	309,166,680
Diluted (shares)	293,407,422	312,951,988

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 46,020	$ 44,669
Other comprehensive income, net of tax:
Change in funded status of retirement obligations	83	317
Unrealized gain on securities available-for-sale	2,679	10,002
Accretion of loss on securities reclassified to held to maturity	208	284
Reclassification adjustment for security gains included in net income	(736)	(833)
Other-than-temporary impairment accretion on debt securities	399	191
Net gains on derivatives arising during the period	1,220	0
Total other comprehensive income	3,853	9,961
Total comprehensive income	$ 49,873	$ 54,630

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($)	Total	Common stock	Additional paid-in capital	Retained earnings	Treasury stock	Unallocated common stock held by ESOP	Accumulated other comprehensive loss	Common stockAdditional paid-in capital	Common stockRetained earnings
Balance at Dec. 31, 2015	$ 3,311,647,000	$ 3,591,000	$ 2,785,503,000	$ 936,040,000	$ (295,412,000)	$ (90,250,000)	$ (27,825,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	44,669,000			44,669,000
Other comprehensive income, net of tax	9,961,000						9,961,000
Purchase of treasury stock	(140,192,000)				(140,192,000)
Treasury stock allocated to restricted stock plan	0		(1,865,000)	(71,000)	1,936,000
Compensation cost for stock options and restricted stock	4,333,000		4,333,000
Option exercise	3,748,000		(3,929,000)		7,677,000
Cash dividend paid	(19,805,000)			(19,805,000)
ESOP shares allocated or committed to be released	1,365,000		616,000			749,000
Balance at Mar. 31, 2016	3,215,726,000	3,591,000	2,776,607,000	968,884,000	(425,991,000)	(89,501,000)	(17,864,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adopting ASU No. 2016-09								$ (8,051,000)	$ 8,051,000
Balance at Dec. 31, 2016	3,123,245,000	3,591,000	2,765,732,000	1,053,750,000	(587,974,000)	(87,254,000)	(24,600,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	46,020,000			46,020,000
Other comprehensive income, net of tax	3,853,000						3,853,000
Purchase of treasury stock	(61,090)				(61,000)
Treasury stock allocated to restricted stock plan	0		(5,137,000)	919,000	4,218,000
Compensation cost for stock options and restricted stock	4,857,000		4,857,000
Option exercise	3,666,000		(3,286,000)		6,952,000
Restricted stock forfeitures (9,019 shares)	0		102,000	6,000	(108,000)
Cash dividend paid	(24,786,000)			(24,786,000)
ESOP shares allocated or committed to be released	1,698,000		949,000			749,000
Balance at Mar. 31, 2017	$ 3,158,492,000	$ 3,591,000	$ 2,763,217,000	$ 1,075,909,000	$ (576,973,000)	$ (86,505,000)	$ (20,747,000)

Consolidated Statements of Sto7

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Stockholders' Equity [Abstract]
Purchase of treasury stock (shares)	4,270	12,150,000
Dividends paid per share (usd per share)	$ 0.08	$ 0.06
Treasury stock allocated to restricted stock plan (shares)	350,000	161,890
Common stock repurchased for restricted stock plan (shares)	9,019

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 46,020,000	$ 44,669,000
Adjustments to reconcile net income to net cash provided by operating activities:
ESOP and stock-based compensation expense	6,555,000	5,698,000
Amortization of premiums and accretion of discounts on securities, net	5,503,000	3,203,000
Amortization of premiums and accretion of fees and costs on loans, net	(1,242,000)	(624,000)
Amortization of other intangible assets	626,000	740,000
Provision for loan losses	4,000,000	5,000,000
Depreciation and amortization of office properties and equipment	4,084,000	3,756,000
Gain on securities, net	(1,227,000)	(1,388,000)
Mortgage loans originated for sale	(41,244,000)	(29,956,000)
Proceeds from mortgage loan sales	75,511,000	34,039,000
Gain on sales of mortgage loans, net	(877,000)	(504,000)
(Gain) loss on sale of other real estate owned	(174,000)	233,000
Income on bank owned life insurance	(725,000)	(1,260,000)
Increase in accrued interest receivable	(2,953,000)	(5,115,000)
Deferred tax expense	3,654,000	11,422,000
Decrease (increase) in other assets	6,543,000	(1,335,000)
Net tax benefit from stock-based compensation	1,277,000	1,043,000
Increase (decrease) in other liabilities	13,694,000	(22,356,000)
Total adjustments	73,005,000	2,596,000
Net cash provided by operating activities	119,025,000	47,265,000
Cash flows from investing activities:
Purchases of loans receivable	(102,457,000)	(9,419,000)
Net originations of loans receivable	(592,766,000)	(257,211,000)
Proceeds from disposition of loans held for investment	115,000	0
(Gain) loss on disposition of loans held for investment	(115,000)	67,000
Net proceeds from sale of foreclosed real estate	887,000	2,190,000
Proceeds from principal repayments/calls/maturities of securities available for sale	79,867,000	61,590,000
Proceeds from sales of securities available for sale	47,359,000	33,059,000
Proceeds from principal repayments/calls/maturities of securities held to maturity	84,596,000	78,120,000
Proceeds from sales of securities held to maturity	0	0
Purchases of securities available for sale	(231,995,000)	(86,963,000)
Purchases of debt securities held-to-maturity	(35,690,000)	(121,320,000)
Proceeds from redemptions of Federal Home Loan Bank stock	47,771,000	33,609,000
Purchases of Federal Home Loan Bank stock	(61,698,000)	(45,412,000)
Purchases of office properties and equipment	(5,863,000)	(4,846,000)
Death benefit proceeds from bank owned life insurance	9,602,000	468,000
Net cash used in investing activities	(760,387,000)	(316,068,000)
Cash flows from financing activities:
Net increase in deposits	95,190,000	137,731,000
Net increase in other borrowings	547,539,000	264,540,000
Net increase in advance payments by borrowers for taxes and insurance	21,550,000	17,459,000
Dividends paid	(24,786,000)	(19,805,000)
Exercise of stock options	3,666,000	3,835,000
Purchase of treasury stock	(61,000)	(140,192,000)
Net cash provided by financing activities	643,098,000	263,568,000
Net increase (decrease) in cash and cash equivalents	1,736,000	(5,235,000)
Cash and cash equivalents at beginning of period	164,178,000	148,904,000
Cash and cash equivalents at beginning of period	165,914,000	143,669,000
Non-cash investing activities:
Real estate acquired through foreclosure	1,048,000	591,000
Cash paid during the year for:
Interest	41,922,000	37,884,000
Income taxes	$ 0	$ 31,184,000

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements are comprised of the accounts of Investors Bancorp, Inc. and its wholly owned subsidiaries, including Investors Bank (the “Bank”) and the Bank’s wholly-owned subsidiaries (collectively, the “Company”). 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, 2017 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, 2016 Annual Report on Form 10-K. Certain reclassifications have been made in the consolidated financial statements to conform with current year classifications.

Stock Transactions

Stock Transactions	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Stock Transactions	Stock Transactions Stock Repurchase Programs 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. The first program was completed on June 30, 2015. 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. The second program was completed on June 17, 2016. 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 31,481,189 shares. The new repurchase program commenced immediately upon completion of the second repurchase plan on June 17, 2016. During the three months ended March 31, 2017 , withholding of shares for payment of taxes with respect to vesting of equity transactions resulted in the purchase of 4,270 shares at a cost of $61,090 , or approximately $14.31 per share.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2017
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, 2017 2016 (Dollars in thousands, except per share data) Earnings for basic and diluted earnings per common share Earnings applicable to common stockholders $ 46,020 $ 44,669 Shares Weighted-average common shares outstanding - basic 291,185,408 309,166,680 Effect of dilutive common stock equivalents (1) 2,222,014 3,785,308 Weighted-average common shares outstanding - diluted 293,407,422 312,951,988 Earnings per common share Basic $ 0.16 $ 0.14 Diluted $ 0.16 $ 0.14 (1) For the three months ended March 31, 2017 and 2016 , there were 10,861,826 and 11,667,654 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, 2017
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, carrying value, gross unrecognized gains and losses and estimated fair value for held-to-maturity securities as of the dates indicated: At March 31, 2017 Carrying value Gross unrealized gains Gross unrealized losses Estimated fair value (In thousands) Available-for-sale: Equity securities $ 4,849 703 94 5,458 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 625,875 1,575 5,381 622,069 Federal National Mortgage Association 1,106,936 1,818 13,878 1,094,876 Government National Mortgage Association 45,625 — 768 44,857 Total mortgage-backed securities available-for-sale 1,778,436 3,393 20,027 1,761,802 Total available-for-sale securities $ 1,783,285 4,096 20,121 1,767,260 At March 31, 2017 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 $ 2,106 — 2,106 9 — 2,115 Municipal bonds 27,830 — 27,830 1,474 — 29,304 Corporate and other debt securities 65,614 21,084 44,530 38,458 — 82,988 Total debt securities held-to-maturity 95,550 21,084 74,466 39,941 — 114,407 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 421,063 1,395 419,668 1,178 2,689 418,157 Federal National Mortgage Association 1,196,452 1,615 1,194,837 4,851 11,501 1,188,187 Government National Mortgage Association 15,435 — 15,435 24 — 15,459 Total mortgage-backed securities held-to-maturity 1,632,950 3,010 1,629,940 6,053 14,190 1,621,803 Total held-to-maturity securities $ 1,728,500 24,094 1,704,406 45,994 14,190 1,736,210 (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, 2016 Carrying value Gross unrealized gains Gross unrealized losses Estimated fair value (In thousands) Available-for-sale: Equity securities $ 5,825 918 83 6,660 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 603,774 1,971 7,306 598,439 Federal National Mortgage Association 1,022,383 2,678 16,474 1,008,587 Government National Mortgage Association 47,538 — 791 46,747 Total mortgage-backed securities available-for-sale 1,673,695 4,649 24,571 1,653,773 Total available-for-sale securities $ 1,679,520 5,567 24,654 1,660,433 At December 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 $ 2,128 — 2,128 12 — 2,140 Municipal bonds 37,978 — 37,978 1,515 — 39,493 Corporate and other debt securities 65,852 21,760 44,092 40,153 — 84,245 Total debt securities held-to-maturity 105,958 21,760 84,198 41,680 — 125,878 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 411,692 1,559 410,133 793 3,502 407,424 Federal National Mortgage Association 1,246,635 1,802 1,244,833 3,635 15,389 1,233,079 Government National Mortgage Association 16,392 — 16,392 28 — 16,420 Total mortgage-backed securities held-to-maturity 1,674,719 3,361 1,671,358 4,456 18,891 1,656,923 Total held-to-maturity securities $ 1,780,677 25,121 1,755,556 46,136 18,891 1,782,801 (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 March 31, 2017 , 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, 2017 , the TruPS had an amortized cost and estimated fair value of $39.5 million and $77.9 million , respectively. While all were investment grade at purchase, securities classified as non-investment grade at March 31, 2017 had an amortized cost and estimated fair value of $37.5 million and $71.5 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. Investment securities with a carrying value of $781.3 million and an estimated fair value of $773.7 million are pledged to secure borrowings. The contractual maturities of the Bank's mortgage-backed securities are generally less than 20 years with effective lives expected to be shorter due to prepayments. Expected maturities may differ from contractual maturities due to underlying loan prepayments 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, 2017 , by contractual maturity, are shown below. March 31, 2017 Carrying Value Estimated fair value (In thousands) Due in one year or less $ 23,201 23,201 Due after one year through five years 2,181 2,190 Due after five years through ten years 5,000 5,080 Due after ten years 44,084 83,936 Total $ 74,466 114,407 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, 2017 and December 31, 2016 , was as follows: March 31, 2017 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 $ 4,734 94 — — 4,734 94 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 354,274 5,341 11,829 40 366,103 5,381 Federal National Mortgage Association 724,705 13,413 23,319 465 748,024 13,878 Government National Mortgage Association 44,857 768 — — 44,857 768 Total mortgage-backed securities available-for-sale 1,123,836 19,522 35,148 505 1,158,984 20,027 Total available-for-sale securities 1,128,570 19,616 35,148 505 1,163,718 20,121 Held-to-maturity: Mortgage-backed securities: Federal Home Loan Mortgage Corporation 301,831 2,561 3,325 128 305,156 2,689 Federal National Mortgage Association 673,969 11,429 12,257 72 686,226 11,501 Total held-to-maturity securities 975,800 13,990 15,582 200 991,382 14,190 Total $ 2,104,370 33,606 50,730 705 2,155,100 34,311 December 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: Equity Securities $ 4,722 83 — — 4,722 83 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 406,878 7,220 12,756 86 419,634 7,306 Federal National Mortgage Association 762,272 15,977 25,089 497 787,361 16,474 Government National Mortgage Association 46,747 791 — — 46,747 791 Total mortgage-backed securities available-for-sale 1,215,897 23,988 37,845 583 1,253,742 24,571 Total available-for-sale securities 1,220,619 24,071 37,845 583 1,258,464 24,654 Held-to-maturity: Mortgage-backed securities: Federal Home Loan Mortgage Corporation 339,666 3,354 3,623 148 343,289 3,502 Federal National Mortgage Association 970,194 15,389 — — 970,194 15,389 Total held-to-maturity securities 1,309,860 18,743 3,623 148 1,313,483 18,891 Total $ 2,530,479 42,814 41,468 731 2,571,947 43,545 At March 31, 2017 , gross unrealized losses primarily 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 negatively impacted by the recent increase in intermediate-term market interest rates. The remainder of gross unrealized losses at March 31, 2017 relate to equity securities. 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 issuer underlying our TruPS. Cash flows for each security are forecast using assumptions for defaults, recoveries, pre-payments and amortization. At March 31, 2017 and 2016 , 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, 2017 and 2016 . At March 31, 2017 , non-credit related OTTI recorded on the previously impaired TruPS was $21.1 million ( $12.5 million after-tax.) This amount 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, 2017 2016 (In thousands) Balance of credit related OTTI, beginning of period $ 95,743 100,200 Additions: Initial credit impairments — — Subsequent credit impairments — — Reductions: Accretion of credit loss impairment due to an increase in expected cash flows (2,935 ) (1,112 ) Reductions for securities sold or paid off during the period (3,811 ) — Balance of credit related OTTI, end of period $ 88,997 99,088 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 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, 2017 , the Company received sale proceeds of $47.4 million on pools of mortgage backed securities from the available-for-sale portfolio resulting in a gross realized gain of $1.2 million . There were no proceeds from sales in the held-to-maturity portfolio for the three months ended March 31, 2017 ; however, the Company received proceeds of $3.1 million from the liquidation of a TruP security. As a result, $1.9 million was recognized as interest income from securities in the Consolidated Statements of Income. For the three months ended March 31, 2016 , the Company received proceeds of $33.1 million on pools of mortgage-backed securities sold 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 the held-to-maturity portfolio.

Loans Receivable, Net

Loans Receivable, Net	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Loans Receivable, Net	Loans Receivable, Net The detail of the loan portfolio as of March 31, 2017 and December 31, 2016 was as follows: March 31, December 31, (In thousands) Multi-family loans $ 7,795,974 7,459,131 Commercial real estate loans 4,630,407 4,445,194 Commercial and industrial loans 1,374,599 1,275,283 Construction loans 335,341 314,843 Total commercial loans 14,136,321 13,494,451 Residential mortgage loans 4,749,058 4,710,373 Consumer and other loans 611,226 596,922 Total loans excluding PCI loans 19,496,605 18,801,746 PCI loans 8,823 8,956 Net unamortized premiums and deferred loan costs (1) (13,245 ) (12,474 ) Allowance for loan losses (230,912 ) (228,373 ) Net loans $ 19,261,271 18,569,855 (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, 2017 and 2016 : Three Months Ended March 31, 2017 2016 (In thousands) Balance, beginning of period $ 1,451 449 Accretion (44 ) (67 ) Net reclassification from non-accretable difference (1) — 1,221 Balance, end of period $ 1,407 1,603 (1) Reclassifications of the non-accretable difference to the accretable yield may occur subsequent to the loan acquisition dates due to increases in expected cash flows of the loans. An analysis of the allowance for loan losses is summarized as follows: Three Months Ended March 31, 2017 2016 (Dollars in thousands) Balance at beginning of the period $ 228,373 218,505 Loans charged off (3,005 ) (7,977 ) Recoveries 1,544 1,085 Net charge-offs (1,461 ) (6,892 ) Provision for loan losses 4,000 5,000 Balance at end of the period $ 230,912 216,613 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 its calculation of the allowance for loan loss. For the three months ended March 31, 2017 , the Company recorded charge-offs of $33,000 related to PCI loans acquired. 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 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. Reserves for each loan segment or the loss factors are generally determined 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, credit concentrations, lending policies and procedures and industry trends, 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 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. The 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 lending emphasis has been the origination of multi-family loans, commercial real estate loans, commercial and industrial loans, one- to four-family residential mortgage loans secured by one- to four-family residential real estate, construction loans and consumer loans, the majority of which are home equity loans, home equity lines of credit and cash surrender value lending on life insurance contracts. 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 to our loan portfolio 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 biennially 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 special assets 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. 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 relevant 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, 2017 and December 31, 2016 : March 31, 2017 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, 2016 $ 95,561 52,796 43,492 11,653 19,831 2,850 2,190 228,373 Charge-offs (6 ) (419 ) (1,751 ) (100 ) (727 ) (2 ) — (3,005 ) Recoveries 280 55 72 — 1,117 20 — 1,544 Provision (5,752 ) 8,820 1,942 (859 ) (1,246 ) (98 ) 1,193 4,000 Ending balance-March 31, 2017 $ 90,083 61,252 43,755 10,694 18,975 2,770 3,383 230,912 Individually evaluated for impairment $ — — — — 1,676 41 — 1,717 Collectively evaluated for impairment 90,083 61,252 43,755 10,694 17,299 2,729 3,383 229,195 Loans acquired with deteriorated credit quality — — — — — — — — Balance at March 31, 2017 $ 90,083 61,252 43,755 10,694 18,975 2,770 3,383 230,912 Loans: Individually evaluated for impairment $ 1,379 6,748 1,656 — 26,824 583 — 37,190 Collectively evaluated for impairment 7,794,595 4,623,659 1,372,943 335,341 4,722,234 610,643 — 19,459,415 Loans acquired with deteriorated credit quality — 7,020 — — 1,471 332 — 8,823 Balance at March 31, 2017 $ 7,795,974 4,637,427 1,374,599 335,341 4,750,529 611,558 — 19,505,428 December 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 (161 ) (455 ) (4,485 ) (52 ) (9,425 ) (419 ) — (14,997 ) Recoveries 1,885 689 541 267 1,631 102 — 5,115 Provision 5,614 5,563 6,851 4,644 (3,818 ) 12 884 19,750 Ending balance-December 31, 2016 $ 95,561 52,796 43,492 11,653 19,831 2,850 2,190 228,373 Individually evaluated for impairment $ — — — — 1,581 20 — 1,601 Collectively evaluated for impairment 95,561 52,796 43,492 11,653 18,250 2,830 2,190 226,772 Loans acquired with deteriorated credit quality — — — — — — — — Balance at December 31, 2016 $ 95,561 52,796 43,492 11,653 19,831 2,850 2,190 228,373 Loans: Individually evaluated for impairment $ 248 5,962 3,370 — 24,453 371 — 34,404 Collectively evaluated for impairment 7,458,883 4,439,232 1,271,913 314,843 4,685,920 596,551 — 18,767,342 Loans acquired with deteriorated credit quality — 7,106 — — 1,507 343 — 8,956 Balance at December 31, 2016 $ 7,459,131 4,452,300 1,275,283 314,843 4,711,880 597,265 — 18,810,702 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 if not already identified as impaired. 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 if not already identified as impaired. 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 as well as those identified as impaired 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, 2017 and December 31, 2016 by class of loans, excluding PCI loans: March 31, 2017 Pass Watch Special Mention Substandard Doubtful Loss Total (In thousands) Commercial loans: Multi-family $ 7,201,975 353,911 139,948 100,140 — — 7,795,974 Commercial real estate 4,021,849 397,567 96,352 114,639 — — 4,630,407 Commercial and industrial 924,256 420,606 24,242 5,495 — — 1,374,599 Construction 233,837 95,841 1,200 4,463 — — 335,341 Total commercial loans 12,381,917 1,267,925 261,742 224,737 — — 14,136,321 Residential mortgage 4,642,980 21,658 7,764 76,656 — — 4,749,058 Consumer and other 594,906 8,027 591 7,702 — — 611,226 Total $ 17,619,803 1,297,610 270,097 309,095 — — 19,496,605 December 31, 2016 Pass Watch Special Mention Substandard Doubtful Loss Total (In thousands) Commercial loans: Multi-family $ 6,961,809 276,858 165,948 54,516 — — 7,459,131 Commercial real estate 3,900,988 373,319 134,154 36,733 — — 4,445,194 Commercial and industrial 900,190 344,628 23,588 6,877 — — 1,275,283 Construction 230,630 76,773 3,200 4,240 — — 314,843 Total commercial loans 11,993,617 1,071,578 326,890 102,366 — — 13,494,451 Residential mortgage 4,600,611 21,873 10,239 77,650 — — 4,710,373 Consumer and other 583,140 5,627 719 7,436 — — 596,922 Total $ 17,177,368 1,099,078 337,848 187,452 — — 18,801,746 The following tables present the payment status of the recorded investment in past due loans as of March 31, 2017 and December 31, 2016 by class of loans, excluding PCI loans: March 31, 2017 30-59 Days 60-89 Days Greater than 90 Days Total Past Due Current Total Loans Receivable (In thousands) Commercial loans: Multi-family $ 14,702 — 227 14,929 7,781,045 7,795,974 Commercial real estate 38,964 8,570 5,109 52,643 4,577,764 4,630,407 Commercial and industrial 1,062 575 553 2,190 1,372,409 1,374,599 Construction — — — — 335,341 335,341 Total commercial loans 54,728 9,145 5,889 69,762 14,066,559 14,136,321 Residential mortgage 23,276 8,321 54,492 86,089 4,662,969 4,749,058 Consumer and other 8,027 591 7,122 15,740 595,486 611,226 Total $ 86,031 18,057 67,503 171,591 19,325,014 19,496,605 December 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 $ 5,272 1,099 234 6,605 7,452,526 7,459,131 Commercial real estate 6,568 31,964 6,445 44,977 4,400,217 4,445,194 Commercial and industrial 864 885 2,971 4,720 1,270,563 1,275,283 Construction — — — — 314,843 314,843 Total commercial loans 12,704 33,948 9,650 56,302 13,438,149 13,494,451 Residential mortgage 24,052 10,930 58,119 93,101 4,617,272 4,710,373 Consumer and other 5,627 719 7,065 13,411 583,511 596,922 Total $ 42,383 45,597 74,834 162,814 18,638,932 18,801,746 The following table presents non-accrual loans, excluding PCI loans, at the dates indicated: March 31, 2017 December 31, 2016 # of loans Amount # of loans Amount (Dollars in thousands) Non-accrual: Multi-family 2 $ 473 2 $ 482 Commercial real estate 24 8,243 24 9,205 Commercial and industrial 4 2,209 8 4,659 Total commercial loans 30 10,925 34 14,346 Residential mortgage and consumer 470 76,158 478 79,928 Total non-accrual loans 500 $ 87,083 512 $ 94,274 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, 2017 and December 31, 2016 , these loans are comprised of the following: March 31, 2017 December 31, 2016 # of loans Amount # of loans Amount (Dollars in thousands) Current TDR classified as non-accrual: Multi-family 1 $ 246 1 $ 248 Commercial real estate 3 509 1 63 Commercial and industrial 1 282 1 286 Total commercial loans 5 1,037 3 597 Residential mortgage and consumer 28 5,958 23 5,721 Total current TDR classified as non-accrual 33 $ 6,995 26 $ 6,318 The following table presents TDR loans which were also 30-89 days delinquent and classified as non-accrual at the dates indicated: March 31, 2017 December 31, 2016 # of loans Amount # of loans Amount (Dollars in thousands) TDR 30-89 days delinquent classified as non-accrual: Commercial real estate 2 $ 167 2 $ 169 Residential mortgage and consumer 11 2,173 14 2,869 Total current TDR classified as non-accrual 13 $ 2,340 16 $ 3,038 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, 2017 , PCI loans with a carrying value of $8.8 million included $7.5 million of which were current, none of which were 30 - 89 days delinquent and $1.3 million of which were 90 days or more delinquent. As of December 31, 2016 , PCI loans with a carrying value of $9.0 million included $7.7 million of which were current, none of which were 30-89 days delinquent and $1.3 million of which were 90 days or more delinquent. At March 31, 2017 and December 31, 2016 , loans meeting the Company’s definition of an impaired loan were primarily collateral dependent loans which totaled $37.2 million and $34.4 million , respectively, with allocations of the allowance for loan losses of $1.7 million and $1.6 million for the periods ending March 31, 2017 and December 31, 2016 , respectively. During the three months ended March 31, 2017 and 2016 , interest income received and recognized on these loans totaled $367,000 and $393,000 , respectively. The following tables present loans individually evaluated for impairment by portfolio segment as of March 31, 2017 and December 31, 2016 : March 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) With no related allowance: Multi-family $ 1,379 1,387 — 1,395 22 Commercial real estate 6,748 10,143 — 6,744 86 Commercial and industrial 1,656 2,211 — 1,645 28 Construction — — — — — Total commercial loans 9,783 13,741 — 9,784 136 Residential mortgage and consumer 12,499 16,092 — 10,795 114 With an allowance recorded: Multi-family — — — — — Commercial real estate — — — — — Commercial and industrial — — — — — Construction — — — — — Total commercial loans — — — — — Residential mortgage and consumer 14,908 15,541 1,717 13,689 117 Total: Multi-family 1,379 1,387 — 1,395 22 Commercial real estate 6,748 10,143 — 6,744 86 Commercial and industrial 1,656 2,211 — 1,645 28 Construction — — — — — Total commercial loans 9,783 13,741 — 9,784 136 Residential mortgage and consumer 27,407 31,633 1,717 24,484 231 Total impaired loans $ 37,190 45,374 1,717 34,268 367 December 31, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) With no related allowance: Multi-family $ 248 248 — 252 20 Commercial real estate 5,962 9,265 — 5,790 301 Commercial and industrial 3,370 3,972 — 3,953 169 Construction — — — — — Total commercial loans 9,580 13,485 — 9,995 490 Residential mortgage and consumer 11,030 14,565 — 9,899 483 With an allowance recorded: Multi-family — — — — — Commercial real estate — — — — — Commercial and industrial — — — — — Construction — — — — — Total commercial loans — — — — — Residential mortgage and consumer 13,794 14,382 1,601 13,689 479 Total: Multi-family 248 248 — 252 20 Commercial real estate 5,962 9,265 — 5,790 301 Commercial and industrial 3,370 3,972 — 3,953 169 Construction — — — — — Total commercial loans 9,580 13,485 — 9,995 490 Residential mortgage and consumer 24,824 28,947 1,601 23,588 962 Total impaired loans $ 34,404 42,432 1,601 33,583 1,452 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 TDR. Substantially all of our TDR 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 TDR loans at March 31, 2017 and December 31, 2016 . There were three residential PCI loans that were classified as TDRs and are included in the table below at March 31, 2017 . There were three residential PCI loans that were classified as TDRs for the period ended December 31, 2016 . March 31, 2017 Accrual Non-accrual Total # of loans Amount # of loans Amount # of loans Amount (Dollars in thousands) Commercial loans: Multi-family — $ — 1 $ 246 1 $ 246 Commercial real estate — — 7 3,679 7 3,679 Commercial and industrial — — 2 1,656 2 1,656 Total commercial loans — — 10 5,581 10 5,581 Residential mortgage and consumer 47 12,243 65 15,164 112 27,407 Total 47 $ 12,243 75 $ 20,745 122 $ 32,988 December 31, 2016 Accrual Non-accrual Total # of loans Amount # of loans Amount # of loans Amount (Dollars in thousands) Commercial loans: Multi-family — $ — 1 $ 248 1 $ 248 Commercial real estate 2 352 4 3,240 6 3,592 Commercial and industrial — — 2 1,688 2 1,688 Total commercial loans 2 352 7 5,176 9 5,528 Residential mortgage and consumer 40 9,093 61 15,731 101 24,824 Total 42 $ 9,445 68 $ 20,907 110 $ 30,352 The following table presents information about TDRs that occurred during the three months ended March 31, 2017 and 2016 : Three Months Ended March 31, 2017 2016 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 Restructurings: Commercial real estate 1 166 166 2 442 442 Residential mortgage and consumer 13 2,879 2,779 7 958 958 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 charge-offs of $100,000 for collateral dependent TDRs during the three months ended March 31, 2017 . There were no charge-offs for collateral dependent TDRs during the three months ended March 31, 2016 . The allowance for loan losses associated with the TDRs presented in the above tables totaled $1.7 million and $1.6 million at March 31, 2017 and December 31, 2016 , 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. The commercial loan modification which qualified as a TDR had its maturity extended. 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, 2017 and 2016 : Three Months Ended March 31, 2017 2016 Number of Loans Pre-modification Interest Yield Post- modification Interest Yield Number of Loans Pre-modification Interest Yield Post- modification Interest Yield Troubled Debt Restructurings: Commercial real estate 1 5.50 % 5.50 % 2 4.12 % 4.44 % Residential mortgage and consumer 13 4.27 % 3.54 % 7 6.05 % 3.99 % Payment defaults for loans modified as a TDR in the previous 12 months to March 31, 2017 consisted of 9 residential loans and 2 commercial real estate loans with a recorded investment of $1.6 million and $498,000 , respectively, at March 31, 2017 . Payment defaults for loans modified as TDRs 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 .

Deposits

Deposits	3 Months Ended
	Mar. 31, 2017
Banking and Thrift [Abstract]
Deposits	Deposits Deposits are summarized as follows: March 31, 2017 December 31, 2016 (In thousands) Non-interest bearing: Checking accounts $ 2,234,674 2,173,493 Interest bearing: Checking accounts 3,954,999 3,916,208 Money market deposits 4,224,490 4,150,583 Savings 2,137,895 2,092,989 Certificates of deposit 2,823,965 2,947,560 Total deposits $ 15,376,023 15,280,833

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The following table summarizes net intangible assets and goodwill at March 31, 2017 and December 31, 2016 : March 31, December 31, (In thousands) Mortgage servicing rights $ 15,172 14,889 Core deposit premiums 7,826 8,451 Other 906 928 Total other intangible assets 23,904 24,268 Goodwill 77,571 77,571 Goodwill and intangible assets $ 101,475 101,839 The following table summarizes other intangible assets as of March 31, 2017 and December 31, 2016 : Gross Intangible Asset Accumulated Amortization Valuation Allowance Net Intangible Assets (In thousands) March 31, 2017 Mortgage servicing rights $ 24,340 (9,003 ) (165 ) 15,172 Core deposit premiums 25,058 (17,232 ) — 7,826 Other 1,150 (244 ) — 906 Total other intangible assets $ 50,548 (26,479 ) (165 ) 23,904 December 31, 2016 Mortgage servicing rights $ 24,340 (9,286 ) (165 ) 14,889 Core deposit premiums 25,058 (16,607 ) — 8,451 Other 1,150 (222 ) — 928 Total other intangible assets $ 50,548 (26,115 ) (165 ) 24,268 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 had an unpaid principal balance of $1.97 billion and $1.98 billion at March 31, 2017 and December 31, 2016 respectively, all of which relate to residential mortgage loans. At March 31, 2017 and December 31, 2016 , the servicing asset, included in intangible assets, had an estimated fair value of $15.2 million and $14.9 million , respectively. For the three months ended March 31, 2017 , fair value was based on expected future cash flows considering a weighted average discount rate of 14.26% , a weighted average constant prepayment rate on mortgages of 8.94% and a weighted average life of 7.2 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, 2017
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, 2017 , the Company granted 350,000 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. Upon exercise of vested options, management expects to draw on treasury stock as the source for shares. For the three months ended March 31, 2017 , the Company granted no stock options under the 2015 Plan. The Company recognizes the cost of employee services received in exchange for awards of equity instruments based on the grant-date fair value of those awards in accordance with ASC 718, “Compensation- Stock Compensation ” (“ASC 718”). The Company estimates the per share fair value of option grants on the date of grant using the Black-Scholes option pricing model using assumptions for the expected dividend yield, expected stock price volatility, risk-free interest rate and expected option term. These assumptions are subjective in nature, involve uncertainties and, therefore, cannot be determined with precision. The Black-Scholes option pricing model also contains certain inherent limitations when applied to options that are not traded on public markets. ASU 2016-09, Compensation — Stock Compensation (Topic 718) 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 be classified as an operating activity. In accordance with SEC Staff Accounting Bulletin No. 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, 2017 and 2016 : Three Months Ended March 31, 2017 2016 (Dollars in thousands) Stock option expense $ 1,426 1,380 Restricted stock expense 3,431 2,953 Total share based compensation expense $ 4,857 4,333 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, 2017 : Number of Stock Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life (in years) Aggregate Intrinsic Value Outstanding at December 31, 2016 13,165,333 $11.74 8.2 $29,101 Granted — — 0.0 Exercised (578,800 ) 6.33 2.3 Forfeited (34,855 ) 12.54 Expired — — Outstanding at March 31, 2017 12,551,678 $11.99 8.2 $30,041 Exercisable at March 31, 2017 3,156,608 $10.39 6.6 $12,590 Expected future expense relating to the non-vested options outstanding as of March 31, 2017 is $25.0 million over a weighted average period of 4.6 years. The following is a summary of the status of the Company’s restricted shares as of March 31, 2017 and changes therein during the three months ended: Number of Shares Awarded Weighted Average Grant Date fair Value Outstanding at December 31, 2016 5,876,491 $ 12.51 Granted 350,000 14.68 Vested (7,289 ) 11.22 Forfeited (9,019 ) 11.34 Outstanding and non vested at March 31, 2017 6,210,183 $ 12.63 Expected future expense relating to the non-vested restricted shares outstanding as of March 31, 2017 is $65.8 million over a weighted average period of 4.6 years.

Net Periodic Benefit Plan Expen

Net Periodic Benefit Plan Expense	3 Months Ended
	Mar. 31, 2017
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 was 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 incentive (over a consecutive 36 -month period within the participant’s credited service period) reduced by the sum of the benefits provided under the Pentegra Defined Benefit Plan for Financial Institutions (“Pentegra DB Plan”) and the annualized value of their benefits payable under the defined benefit portion of the Supplemental ESOP. Effective as of the close of business of December 31, 2016, the Wage Replacement Plan was amended to freeze future benefit accruals, and for certain participants, structure the benefits payable attributable solely to the participants’ 2016 year of service to vest over a two -year period such that the participants would have a right to 50% of their accrued benefits attributable to their 2016 year of service as of December 31, 2016, which will become 100% vested provided the participants remained continuously employed through and including December 31, 2017. The Supplemental ESOP compensates certain executives (as designated by the Compensation Committee of the Board of Directors) participating in 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, 2017 2016 (In thousands) Service cost $ 371 894 Interest cost 378 474 Amortization of: Prior service cost — — Net loss 115 536 Total net periodic benefit cost $ 864 1,904 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, 2017 . The Company also maintains the Pentegra DB Plan. Since it is a multiemployer plan, costs of the pension plan are based on contributions required to be made to the pension plan. As of December 31, 2016, the annual benefit provided under the Pentegra DB plan has been amended to freeze the plan. Freezing the plan eliminates all future benefit accruals and each participants frozen accrued benefit will be determined as of December 31, 2016 and no further benefits will accrue beyond such date. There was no contribution required during the three months ended March 31, 2017 . We anticipate contributing funds to the plan to meet any minimum funding requirements for the remainder of 2017 .

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities The Company uses various financial instruments, including derivatives, to manage its exposure to interest rate risk. Certain derivatives are designated as hedging instruments in a qualifying hedge accounting relationship (fair value or cash flow hedge.) As of March 31, 2017 the Company has cash flow hedges with an aggregate notional amount of $600.0 million . Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are primarily to reduce cost and add stability to interest expense in an effort to manage its exposure to interest rate movements. Interest rate swaps designated as cash flow hedges involve the receipt of amounts subject to variability caused by changes in interest rates from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is initially recorded in Accumulated Other Comprehensive Income and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the three months ended March 31, 2017 , such derivatives were used to hedge the variability in cash flows associated with certain short term wholesale funding transactions. During the three months ended March 31, 2017 , the Company did not record any hedge ineffectiveness. The ineffective portion of the change in fair value of the derivatives would be recognized directly in earnings. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s variable-rate borrowings. During the next twelve months, the Company estimates that an additional $1.9 million will be reclassified as an increase to interest expense. Fair Values of Derivative Instruments on the Balance Sheet The following table presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 : Asset Derivatives Liability Derivatives At March 31, 2017 (1) At December 31, 2016 At March 31, 2017 (1) At December 31, 2016 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value (In thousands) Derivatives designated as hedging instruments: Interest Rate Swaps Other assets $ — Other assets $ 12,550 Other liabilities $ 358 Other liabilities $ — Total derivatives designated as hedging instruments $ — $ 12,550 $ 358 $ — (1) In accordance with the Chicago Mercantile Exchange ("CME") rulebook changes effective January 3, 2017, the fair value is inclusive of accrued interest and variation margin posted by the CME. The CME amended their rules to legally characterize the variation margin posted between counterparties to be classified as settlements of the outstanding derivative contracts instead of cash collateral. The Company adopted the new rule on a prospective basis to include the accrued interest and variation margin posted by the CME in the fair value. Effect of Derivative Instruments on the Income Statement The following table presents the effect of the Company’s derivative financial instruments on the Consolidated Statement of Income as of March 31, 2017 and 2016 . The Company did not any have derivatives outstanding prior to the quarter ended September 30, 2016. Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Three Months Ended March 31, Three Months Ended March 31, Three Months Ended March 31, 2017 2016 2017 2016 2017 2016 (In thousands) Derivatives in Cash Flow Hedging Relationships: Interest rate swaps $ 1,256 $ — Interest expense $ (807 ) $ — Other non-interest income $ — $ — Total $ 1,256 $ — $ (807 ) $ — $ — $ — Offsetting Derivatives The following table presents a gross presentation, the effects of offsetting, and a net presentation of the Company’s derivatives in the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 . The net amounts of derivative liabilities can be reconciled to the tabular disclosure of fair value. The tabular disclosure of fair value provides the location that derivative assets and liabilities are presented on the Company's Consolidated Balance Sheets. Gross Amounts Not Offset Gross Amounts Recognized Gross Amounts Offset Net Amounts Presented Financial Instruments Cash Collateral Posted Net Amount (In thousands) March 31, 2017 Liabilities: Interest Rate Swaps (1) $ 358 $ — $ 358 $ — $ — $ 358 Total $ 358 $ — $ 358 $ — $ — $ 358 December 31, 2016 Assets: Interest Rate Swaps $ 12,550 $ — $ 12,550 $ — $ 12,550 $ — Total $ 12,550 $ — $ 12,550 $ — $ 12,550 $ — (1) In accordance with the CME rulebook changes effective January 3, 2017, the gross amounts recognized are inclusive of accrued interest and variation margin posted by the CME. Credit-risk-related Contingent Features The Company has agreements with each of its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness, then the Company could also be declared in default on its derivative obligations and could be required to terminate its derivative positions with the counterparty. The Company has agreements with certain of its derivative counterparties that contain a provision where if the Company fails to maintain its status as a well capitalized institution, then the Company could be required to terminate its derivative positions with the counterparty. The Company has minimum collateral posting thresholds with certain of its derivative counterparties and posts collateral on a daily basis as required by the clearing house against the Company's obligations, as required by these agreements.

Comprehensive Income

Comprehensive Income	3 Months Ended
	Mar. 31, 2017
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, 2017 2016 Gross Tax Net Gross Tax Net (Dollars in thousands) Net income $ 73,264 (27,244 ) 46,020 71,124 (26,455 ) 44,669 Other comprehensive income: Change in funded status of retirement obligations 141 (58 ) 83 536 (219 ) 317 Unrealized gain on securities available-for-sale 4,291 (1,612 ) 2,679 16,500 (6,498 ) 10,002 Accretion of loss on securities reclassified to held to maturity from available for sale 352 (144 ) 208 480 (196 ) 284 Reclassification adjustment for security gains included in net income (1,227 ) 491 (736 ) (1,388 ) 555 (833 ) Other-than-temporary impairment accretion on debt securities 673 (274 ) 399 322 (131 ) 191 Net gains on derivatives arising during the period 2,063 (843 ) 1,220 — — — Total other comprehensive income 6,293 (2,440 ) 3,853 16,450 (6,489 ) 9,961 Total comprehensive income $ 79,557 (29,684 ) 49,873 87,574 (32,944 ) 54,630 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, 2017 and 2016 : Change in funded status of retirement obligations Accretion of loss on securities reclassified to held to maturity Unrealized gains on securities available-for-sale and gains included in net income Other-than- temporary impairment accretion on debt securities Unrealized gains on derivatives Total accumulated other comprehensive loss (Dollars in thousands) Balance - December 31, 2016 $ (4,895 ) (1,988 ) (12,271 ) (12,870 ) 7,424 (24,600 ) Net change 83 208 1,943 399 1,220 3,853 Balance - March 31, 2017 $ (4,812 ) (1,780 ) (10,328 ) (12,471 ) 8,644 (20,747 ) Balance - December 31, 2015 $ (12,366 ) (3,080 ) 1,371 (13,750 ) — (27,825 ) Net change 317 284 9,169 191 — 9,961 Balance - March 31, 2016 $ (12,049 ) (2,796 ) 10,540 (13,559 ) — (17,864 ) 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, 2017 2016 (In thousands) Reclassification adjustment for gains included in net income Gain on security transactions, net $ (1,227 ) (1,388 ) Change in funded status of retirement obligations (1) Compensation and fringe benefits: Amortization of prior service cost — — Amortization of net loss 120 536 Compensation and fringe benefits 120 536 Interest Expense Reclassification adjustment for unrealized losses on derivatives 807 — Total before tax (300 ) (852 ) Income tax benefit 133 336 Net of tax $ (167 ) (516 ) (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, 2017
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 and derivatives 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 other real estate owned. 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. Derivatives Derivatives are reported at fair value utilizing Level 2 inputs. The fair values of interest rate swap agreements are based on a valuation model that uses primarily observable inputs, such as benchmark yield curves and interest rate spreads. The following tables provide the level of valuation assumptions used to determine the carrying value of our assets and liabilities measured at fair value on a recurring basis at March 31, 2017 and December 31, 2016 . Carrying Value at March 31, 2017 Total Level 1 Level 2 Level 3 (In thousands) Assets: Securities available for sale: Equity securities $ 5,458 5,458 — — Mortgage-backed securities: Federal Home Loan Mortgage Corporation 622,069 — 622,069 — Federal National Mortgage Association 1,094,876 — 1,094,876 — Government National Mortgage Association 44,857 — 44,857 — Total mortgage-backed securities available-for-sale 1,761,802 — 1,761,802 — Total securities available-for-sale $ 1,767,260 5,458 1,761,802 — Liabilities: Derivative financial instruments (1) $ 358 — 358 — (1) In accordance with the CME rulebook changes effective January 3, 2017, the gross amounts recognized are inclusive of accrued interest and variation margin posted by the CME. Carrying Value at December 31, 2016 Total Level 1 Level 2 Level 3 (In thousands) Assets: Securities available for sale: Equity securities $ 6,660 6,660 — — Mortgage-backed securities: Federal Home Loan Mortgage Corporation 598,439 — 598,439 — Federal National Mortgage Association 1,008,587 — 1,008,587 — Government National Mortgage Association 46,747 — 46,747 — Total mortgage-backed securities available-for-sale 1,653,773 — 1,653,773 — Total securities available-for-sale $ 1,660,433 6,660 1,653,773 — Derivative financial instruments $ 12,550 — 12,550 — There have been no changes in the methodologies used at March 31, 2017 from December 31, 2016 , and there were no transfers between Level 1 and Level 2 during the three months ended March 31, 2017 . There were no Level 3 assets measured at fair value on a recurring basis for the three months ended March 31, 2017 . 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 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, 2017 , the fair value model used prepayment speeds ranging from 3.74% to 23.28% and a discount rate of 14.26% for the valuation of the mortgage servicing rights. At December 31, 2016 , the fair value model used prepayment speeds ranging from 3.15% to 24.18% and a discount rate of 14.27% 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. Impaired 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. Estimated fair value is calculated using the fair value of collateral based on independent third-party appraisals for collateral-dependent loans. 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, 2017 , appraisals were discounted in a range of 0% - 25% for estimated costs to sell. For non collateral-dependent loans, management estimates the fair value using discounted cash flows based on inputs that are largely unobservable and instead reflect management's own estimates of the assumptions as a market participant would in pricing such loans. 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. Loans Held For Sale Residential mortgage loans held for sale are recorded at the lower of cost or fair value and are therefore measured at fair value on a non-recurring basis. When available, the Company uses observable secondary market data, including pricing on recent closed market transactions for loans with similar characteristics. The following tables provide 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, 2017 and December 31, 2016 . For the three months ended March 31, 2017 there was no change to the carrying value of mortgage servicing rights and loans held for sale measured at fair value on a non-recurring basis. For the year ended December 31, 2016 , there was no change to carrying value of other real estate owned measured at fair value on a non-recurring basis. Carrying Value at March 31, 2017 Security Type Valuation Technique Unobservable Input Range Weighted Average Total Level 1 Level 2 Level 3 (In thousands) Impaired loans Market comparable Lack of marketability 1.0% - 45.0% 45.00% $ 24 — — 24 Other real estate owned Market comparable Lack of marketability 0.0% - 25.0% 5.82% 215 — — 215 $ 239 — — 239 Carrying Value at December 31, 2016 Security Type Valuation Technique Unobservable Input Range Weighted Average Total Level 1 Level 2 Level 3 (In thousands) MSR, net Estimated cash flow Prepayment speeds 3.15% - 24.18% 9.84% $ 12,877 — — 12,877 Impaired loans Estimated cash flow Lack of marketability and probability of default 22.0% - 29.0% 26.0% 1,403 — — 1,403 Loans held for sale Market comparable Lack of marketability 2.5% - 4.5% 3.45% 313 — — 313 $ 14,593 — — 14,593 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 forecasted 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 balance of mortgage related assets held by the member. 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 is calculated by discounting forecasted cash flows through the estimated maturity date using estimated market discount rates that reflect the credit and interest rate risk inherent in the loan. 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, 2017 Carrying Estimated Fair Value value Total Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 165,914 165,914 165,914 — — Securities available-for-sale 1,767,260 1,767,260 5,458 1,761,802 — Securities held-to-maturity 1,704,406 1,736,210 — 1,658,303 77,907 Stock in FHLB 251,805 251,805 251,805 — — Loans held for sale 4,908 4,908 — 4,908 — Net loans 19,261,271 18,943,156 — — 18,943,156 Financial liabilities: Deposits, other than time deposits $ 12,552,058 12,552,058 12,552,058 — — Time deposits 2,823,965 2,811,589 — 2,811,589 — Borrowed funds 5,093,790 5,093,224 — 5,093,224 — December 31, 2016 Carrying Estimated Fair Value value Total Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 164,178 164,178 164,178 — — Securities available-for-sale 1,660,433 1,660,433 6,660 1,653,773 — Securities held-to-maturity 1,755,556 1,782,801 — 1,703,559 79,242 Stock in FHLB 237,878 237,878 237,878 — — Loans held for sale 38,298 38,298 — 38,298 — Net loans 18,569,855 18,391,018 — — 18,391,018 Financial liabilities: Deposits, other than time deposits $ 12,333,273 12,333,273 12,333,273 — — Time deposits 2,947,560 2,938,137 — 2,938,137 — Borrowed funds 4,546,251 4,545,745 — 4,545,745 — 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 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, 2017
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In March 2017, the FASB issued Accounting Standards Update ("ASU") 2017-08, " Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities". The amendments in this update require the premium on callable debt securities to be amortized to the earliest call date rather than the maturity date; however, securities held at a discount continue to be amortized to maturity. The amendments apply only to debt securities purchased at a premium that are callable at fixed prices and on preset dates. The amendments more closely align interest income recorded on debt securities held at a premium or discount with the economics of the underlying instrument. ASU No. 2017-08 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently evaluating the provisions of ASU No. 2017-07 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements. In March 2017, the FASB issued ASU 2017-07, "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost", which requires that companies disaggregate the service cost component from other components of net benefit cost. This update calls for companies that offer postretirement benefits to present the service cost, which is the amount an employer has to set aside each quarter or fiscal year to cover the benefits, in the same line item with other current employee compensation costs. Other components of net benefit cost will be presented in the income statement separately from the service cost component and outside the subtotal of income from operations, if one is presented. ASU No. 2017-07 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently evaluating the provisions of ASU No. 2017-07 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment." This ASU simplifies subsequent measurement of goodwill by eliminating Step 2 of the impairment test while retaining the option to perform the qualitative assessment for a reporting unit to determine whether the quantitative impairment test is necessary. The ASU also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. Therefore, the same impairment assessment applies to all reporting units. ASU 2017-04 is effective for fiscal years beginning after December 15, 2019 with early adoption permitted for interim or annual goodwill impairment testing dates beginning after January 1, 2017. The Company is currently evaluating the provisions of ASU No. 2017-04 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-03, "Accounting Changes and Error Corrections (Topic 250) and Investments-Equity Method and Joint Ventures (Topic 323): Amendments to SEC Paragraphs Pursuant to Staff Announcements at the September 22, 2016 and November 17, 2016 EITF Meetings (SEC Update)", which amends certain paragraphs in the Accounting Standards Codification to give effect to announcements made by the SEC observer at two recent Emerging Issues Task Force meetings. SEC registrants are required to reasonably estimate the impact that adoption of the standards on revenue recognition, leases, and measurement of credit losses on financial instruments is expected to have on financial statements. If such estimate is indeterminate, registrants should consider providing additional qualitative disclosures to assess the effect on financial statements as a result of adopting of these new standards. There is no effective date or transition requirements for this standard. In January 2017, the FASB issued ASU 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business." The amendments in this ASU provide a practical way to determine when a set of assets and activities is not a business. The screen provided in this ASU requires that when all or substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, the set is not a business. The amendments also provide other considerations to determine whether a set is a business if the screen is not met. ASU 2017-01 is effective for fiscal years beginning after December 15, 2017, including interim periods within those periods. The Company is currently evaluating the provisions of ASU No. 2017-01 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory." This ASU addresses the recognition of current and deferred taxes for an intra-entity asset transfer and amends current GAAP by eliminating the exception for intra-entity transfers of assets other than inventory to defer such recognition until sale to an outside party. ASU No. 2016-16 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted as of the beginning of an annual period for which financial statements (interim or annual) have not been made available for issuance. The Company is currently evaluating the provisions of ASU No. 2016-16 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements. In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments", a new standard which addresses diversity in practice related to eight specific cash flow issues: debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies), distributions received from equity method investees, beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. ASU No. 2016-15 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities will apply the standard’s provisions using a retrospective transition method to each period presented. If it is impracticable to apply the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable. The Company is currently evaluating the provisions of ASU No. 2016-15 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements. In June 2016, the FASB issued ASU 2016-13, “Measurement of Credit Losses on Financial Instruments.” This ASU significantly changes how entities will measure credit losses for most financial assets and certain other instruments that aren’t measured at fair value through net income. In issuing the standard, the FASB is responding to criticism that today’s guidance delays recognition of credit losses. The standard will replace today’s “incurred loss” approach with an “expected loss” model. The new model, referred to as the current expected credit loss (“CECL”) model, will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. This includes, but is not limited to, loans, leases, held-to-maturity securities, loan commitments, and financial guarantees. The CECL model does not apply to available-for-sale (“AFS”) debt securities. For AFS debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. As a result, entities will recognize improvements to estimated credit losses immediately in earnings rather than as interest income over time, as they do today. The ASU also simplifies the accounting model for purchased credit-impaired debt securities and loans. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models, and methods for estimating the allowance for loan and lease losses. In addition, entities will need to disclose the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination. ASU No. 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted for interim and annual reporting periods beginning after December 15, 2018. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). While early adoption is permitted, the Company does not expect to elect that option. The Company has begun its evaluation of the amended guidance including the potential impact on its Consolidated Financial Statements. The extent of the change is indeterminable at this time as it will be dependent upon portfolio composition and credit quality at the adoption date, as well as economic conditions and forecasts at that time. Upon adoption, any impact to the allowance for credit losses - currently allowance for loan and lease losses - will have an offsetting impact on retained earnings. 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 for leases classified as operating leases as well as finance leases. The update also requires new quantitative disclosures related to leases in the Consolidated Financial Statements. There are practical expedients in this update that relate to leases that commenced before the effective date, initial direct costs and the use of hindsight to extend or terminate a lease or purchase the leased asset. 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 continues to evaluate the impact of the guidance, including determining whether other contracts exist that are deemed to be in scope. As such, no conclusions have yet been reached regarding the potential impact on adoption on the Company's Consolidated Financial Statements and regulatory capital and risk-weighted assets; however, the Company does not expect the amendment to have a material impact on its 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. Due to the Company's proportionately small portfolio of equity securities, the update is not expected to have a material impact on the Company's results of operations. 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. The ASU is effective for public business entities for financial statements issued for fiscal years beginning after December 15, 2017, and early adoption is permitted. Subsequently, the FASB issued the following standards related to ASU 2014-09: ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations” ; ASU 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing”; ASU 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting”; ASU 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients”; and ASU 2017-05, "Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets." These amendments are intended to improve and clarify the implementation guidance of ASU 2014-09 and have the same effective date as the original standard. The Company's revenue is comprised of net interest income on interest earning assets and liabilities and non-interest income. The scope of guidance explicitly excludes net interest income as well as other revenues associated with financial assets and liabilities, including loans, leases, securities and derivatives. Accordingly, the majority of the Company's revenues will not be affected.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2017
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 27, 2017, the Company declared a cash dividend of $0.08 per share. The $0.08 dividend per share will be paid to stockholders on May 25, 2017, with a record date of May 10, 2017.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2017
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, 2017 2016 (Dollars in thousands, except per share data) Earnings for basic and diluted earnings per common share Earnings applicable to common stockholders $ 46,020 $ 44,669 Shares Weighted-average common shares outstanding - basic 291,185,408 309,166,680 Effect of dilutive common stock equivalents (1) 2,222,014 3,785,308 Weighted-average common shares outstanding - diluted 293,407,422 312,951,988 Earnings per common share Basic $ 0.16 $ 0.14 Diluted $ 0.16 $ 0.14 (1) For the three months ended March 31, 2017 and 2016 , there were 10,861,826 and 11,667,654 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, 2017
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, carrying value, gross unrecognized gains and losses and estimated fair value for held-to-maturity securities as of the dates indicated: At March 31, 2017 Carrying value Gross unrealized gains Gross unrealized losses Estimated fair value (In thousands) Available-for-sale: Equity securities $ 4,849 703 94 5,458 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 625,875 1,575 5,381 622,069 Federal National Mortgage Association 1,106,936 1,818 13,878 1,094,876 Government National Mortgage Association 45,625 — 768 44,857 Total mortgage-backed securities available-for-sale 1,778,436 3,393 20,027 1,761,802 Total available-for-sale securities $ 1,783,285 4,096 20,121 1,767,260 At March 31, 2017 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 $ 2,106 — 2,106 9 — 2,115 Municipal bonds 27,830 — 27,830 1,474 — 29,304 Corporate and other debt securities 65,614 21,084 44,530 38,458 — 82,988 Total debt securities held-to-maturity 95,550 21,084 74,466 39,941 — 114,407 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 421,063 1,395 419,668 1,178 2,689 418,157 Federal National Mortgage Association 1,196,452 1,615 1,194,837 4,851 11,501 1,188,187 Government National Mortgage Association 15,435 — 15,435 24 — 15,459 Total mortgage-backed securities held-to-maturity 1,632,950 3,010 1,629,940 6,053 14,190 1,621,803 Total held-to-maturity securities $ 1,728,500 24,094 1,704,406 45,994 14,190 1,736,210 (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, 2016 Carrying value Gross unrealized gains Gross unrealized losses Estimated fair value (In thousands) Available-for-sale: Equity securities $ 5,825 918 83 6,660 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 603,774 1,971 7,306 598,439 Federal National Mortgage Association 1,022,383 2,678 16,474 1,008,587 Government National Mortgage Association 47,538 — 791 46,747 Total mortgage-backed securities available-for-sale 1,673,695 4,649 24,571 1,653,773 Total available-for-sale securities $ 1,679,520 5,567 24,654 1,660,433 At December 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 $ 2,128 — 2,128 12 — 2,140 Municipal bonds 37,978 — 37,978 1,515 — 39,493 Corporate and other debt securities 65,852 21,760 44,092 40,153 — 84,245 Total debt securities held-to-maturity 105,958 21,760 84,198 41,680 — 125,878 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 411,692 1,559 410,133 793 3,502 407,424 Federal National Mortgage Association 1,246,635 1,802 1,244,833 3,635 15,389 1,233,079 Government National Mortgage Association 16,392 — 16,392 28 — 16,420 Total mortgage-backed securities held-to-maturity 1,674,719 3,361 1,671,358 4,456 18,891 1,656,923 Total held-to-maturity securities $ 1,780,677 25,121 1,755,556 46,136 18,891 1,782,801 (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, 2017 , by contractual maturity, are shown below. March 31, 2017 Carrying Value Estimated fair value (In thousands) Due in one year or less $ 23,201 23,201 Due after one year through five years 2,181 2,190 Due after five years through ten years 5,000 5,080 Due after ten years 44,084 83,936 Total $ 74,466 114,407
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, 2017 and December 31, 2016 , was as follows: March 31, 2017 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 $ 4,734 94 — — 4,734 94 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 354,274 5,341 11,829 40 366,103 5,381 Federal National Mortgage Association 724,705 13,413 23,319 465 748,024 13,878 Government National Mortgage Association 44,857 768 — — 44,857 768 Total mortgage-backed securities available-for-sale 1,123,836 19,522 35,148 505 1,158,984 20,027 Total available-for-sale securities 1,128,570 19,616 35,148 505 1,163,718 20,121 Held-to-maturity: Mortgage-backed securities: Federal Home Loan Mortgage Corporation 301,831 2,561 3,325 128 305,156 2,689 Federal National Mortgage Association 673,969 11,429 12,257 72 686,226 11,501 Total held-to-maturity securities 975,800 13,990 15,582 200 991,382 14,190 Total $ 2,104,370 33,606 50,730 705 2,155,100 34,311 December 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: Equity Securities $ 4,722 83 — — 4,722 83 Mortgage-backed securities: Federal Home Loan Mortgage Corporation 406,878 7,220 12,756 86 419,634 7,306 Federal National Mortgage Association 762,272 15,977 25,089 497 787,361 16,474 Government National Mortgage Association 46,747 791 — — 46,747 791 Total mortgage-backed securities available-for-sale 1,215,897 23,988 37,845 583 1,253,742 24,571 Total available-for-sale securities 1,220,619 24,071 37,845 583 1,258,464 24,654 Held-to-maturity: Mortgage-backed securities: Federal Home Loan Mortgage Corporation 339,666 3,354 3,623 148 343,289 3,502 Federal National Mortgage Association 970,194 15,389 — — 970,194 15,389 Total held-to-maturity securities 1,309,860 18,743 3,623 148 1,313,483 18,891 Total $ 2,530,479 42,814 41,468 731 2,571,947 43,545
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, 2017 2016 (In thousands) Balance of credit related OTTI, beginning of period $ 95,743 100,200 Additions: Initial credit impairments — — Subsequent credit impairments — — Reductions: Accretion of credit loss impairment due to an increase in expected cash flows (2,935 ) (1,112 ) Reductions for securities sold or paid off during the period (3,811 ) — Balance of credit related OTTI, end of period $ 88,997 99,088

Loans Receivable, Net (Tables)

Loans Receivable, Net (Tables)	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The detail of the loan portfolio as of March 31, 2017 and December 31, 2016 was as follows: March 31, December 31, (In thousands) Multi-family loans $ 7,795,974 7,459,131 Commercial real estate loans 4,630,407 4,445,194 Commercial and industrial loans 1,374,599 1,275,283 Construction loans 335,341 314,843 Total commercial loans 14,136,321 13,494,451 Residential mortgage loans 4,749,058 4,710,373 Consumer and other loans 611,226 596,922 Total loans excluding PCI loans 19,496,605 18,801,746 PCI loans 8,823 8,956 Net unamortized premiums and deferred loan costs (1) (13,245 ) (12,474 ) Allowance for loan losses (230,912 ) (228,373 ) Net loans $ 19,261,271 18,569,855 (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, 2017 and 2016 : Three Months Ended March 31, 2017 2016 (In thousands) Balance, beginning of period $ 1,451 449 Accretion (44 ) (67 ) Net reclassification from non-accretable difference (1) — 1,221 Balance, end of period $ 1,407 1,603 (1) Reclassifications of the non-accretable difference to the accretable yield may occur subsequent to the loan acquisition dates due to increases in expected cash flows of the loans.
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, 2017 2016 (Dollars in thousands) Balance at beginning of the period $ 228,373 218,505 Loans charged off (3,005 ) (7,977 ) Recoveries 1,544 1,085 Net charge-offs (1,461 ) (6,892 ) Provision for loan losses 4,000 5,000 Balance at end of the period $ 230,912 216,613
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, 2017 and December 31, 2016 : March 31, 2017 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, 2016 $ 95,561 52,796 43,492 11,653 19,831 2,850 2,190 228,373 Charge-offs (6 ) (419 ) (1,751 ) (100 ) (727 ) (2 ) — (3,005 ) Recoveries 280 55 72 — 1,117 20 — 1,544 Provision (5,752 ) 8,820 1,942 (859 ) (1,246 ) (98 ) 1,193 4,000 Ending balance-March 31, 2017 $ 90,083 61,252 43,755 10,694 18,975 2,770 3,383 230,912 Individually evaluated for impairment $ — — — — 1,676 41 — 1,717 Collectively evaluated for impairment 90,083 61,252 43,755 10,694 17,299 2,729 3,383 229,195 Loans acquired with deteriorated credit quality — — — — — — — — Balance at March 31, 2017 $ 90,083 61,252 43,755 10,694 18,975 2,770 3,383 230,912 Loans: Individually evaluated for impairment $ 1,379 6,748 1,656 — 26,824 583 — 37,190 Collectively evaluated for impairment 7,794,595 4,623,659 1,372,943 335,341 4,722,234 610,643 — 19,459,415 Loans acquired with deteriorated credit quality — 7,020 — — 1,471 332 — 8,823 Balance at March 31, 2017 $ 7,795,974 4,637,427 1,374,599 335,341 4,750,529 611,558 — 19,505,428 December 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 (161 ) (455 ) (4,485 ) (52 ) (9,425 ) (419 ) — (14,997 ) Recoveries 1,885 689 541 267 1,631 102 — 5,115 Provision 5,614 5,563 6,851 4,644 (3,818 ) 12 884 19,750 Ending balance-December 31, 2016 $ 95,561 52,796 43,492 11,653 19,831 2,850 2,190 228,373 Individually evaluated for impairment $ — — — — 1,581 20 — 1,601 Collectively evaluated for impairment 95,561 52,796 43,492 11,653 18,250 2,830 2,190 226,772 Loans acquired with deteriorated credit quality — — — — — — — — Balance at December 31, 2016 $ 95,561 52,796 43,492 11,653 19,831 2,850 2,190 228,373 Loans: Individually evaluated for impairment $ 248 5,962 3,370 — 24,453 371 — 34,404 Collectively evaluated for impairment 7,458,883 4,439,232 1,271,913 314,843 4,685,920 596,551 — 18,767,342 Loans acquired with deteriorated credit quality — 7,106 — — 1,507 343 — 8,956 Balance at December 31, 2016 $ 7,459,131 4,452,300 1,275,283 314,843 4,711,880 597,265 — 18,810,702
Schedule of Risk Category of Loans by Class of Loans	The following tables present the risk category of loans as of March 31, 2017 and December 31, 2016 by class of loans, excluding PCI loans: March 31, 2017 Pass Watch Special Mention Substandard Doubtful Loss Total (In thousands) Commercial loans: Multi-family $ 7,201,975 353,911 139,948 100,140 — — 7,795,974 Commercial real estate 4,021,849 397,567 96,352 114,639 — — 4,630,407 Commercial and industrial 924,256 420,606 24,242 5,495 — — 1,374,599 Construction 233,837 95,841 1,200 4,463 — — 335,341 Total commercial loans 12,381,917 1,267,925 261,742 224,737 — — 14,136,321 Residential mortgage 4,642,980 21,658 7,764 76,656 — — 4,749,058 Consumer and other 594,906 8,027 591 7,702 — — 611,226 Total $ 17,619,803 1,297,610 270,097 309,095 — — 19,496,605 December 31, 2016 Pass Watch Special Mention Substandard Doubtful Loss Total (In thousands) Commercial loans: Multi-family $ 6,961,809 276,858 165,948 54,516 — — 7,459,131 Commercial real estate 3,900,988 373,319 134,154 36,733 — — 4,445,194 Commercial and industrial 900,190 344,628 23,588 6,877 — — 1,275,283 Construction 230,630 76,773 3,200 4,240 — — 314,843 Total commercial loans 11,993,617 1,071,578 326,890 102,366 — — 13,494,451 Residential mortgage 4,600,611 21,873 10,239 77,650 — — 4,710,373 Consumer and other 583,140 5,627 719 7,436 — — 596,922 Total $ 17,177,368 1,099,078 337,848 187,452 — — 18,801,746
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, 2017 and December 31, 2016 by class of loans, excluding PCI loans: March 31, 2017 30-59 Days 60-89 Days Greater than 90 Days Total Past Due Current Total Loans Receivable (In thousands) Commercial loans: Multi-family $ 14,702 — 227 14,929 7,781,045 7,795,974 Commercial real estate 38,964 8,570 5,109 52,643 4,577,764 4,630,407 Commercial and industrial 1,062 575 553 2,190 1,372,409 1,374,599 Construction — — — — 335,341 335,341 Total commercial loans 54,728 9,145 5,889 69,762 14,066,559 14,136,321 Residential mortgage 23,276 8,321 54,492 86,089 4,662,969 4,749,058 Consumer and other 8,027 591 7,122 15,740 595,486 611,226 Total $ 86,031 18,057 67,503 171,591 19,325,014 19,496,605 December 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 $ 5,272 1,099 234 6,605 7,452,526 7,459,131 Commercial real estate 6,568 31,964 6,445 44,977 4,400,217 4,445,194 Commercial and industrial 864 885 2,971 4,720 1,270,563 1,275,283 Construction — — — — 314,843 314,843 Total commercial loans 12,704 33,948 9,650 56,302 13,438,149 13,494,451 Residential mortgage 24,052 10,930 58,119 93,101 4,617,272 4,710,373 Consumer and other 5,627 719 7,065 13,411 583,511 596,922 Total $ 42,383 45,597 74,834 162,814 18,638,932 18,801,746
Non-Accrual Loans Status	The following table presents non-accrual loans, excluding PCI loans, at the dates indicated: March 31, 2017 December 31, 2016 # of loans Amount # of loans Amount (Dollars in thousands) Non-accrual: Multi-family 2 $ 473 2 $ 482 Commercial real estate 24 8,243 24 9,205 Commercial and industrial 4 2,209 8 4,659 Total commercial loans 30 10,925 34 14,346 Residential mortgage and consumer 470 76,158 478 79,928 Total non-accrual loans 500 $ 87,083 512 $ 94,274 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, 2017 and December 31, 2016 , these loans are comprised of the following: March 31, 2017 December 31, 2016 # of loans Amount # of loans Amount (Dollars in thousands) Current TDR classified as non-accrual: Multi-family 1 $ 246 1 $ 248 Commercial real estate 3 509 1 63 Commercial and industrial 1 282 1 286 Total commercial loans 5 1,037 3 597 Residential mortgage and consumer 28 5,958 23 5,721 Total current TDR classified as non-accrual 33 $ 6,995 26 $ 6,318 The following table presents TDR loans which were also 30-89 days delinquent and classified as non-accrual at the dates indicated: March 31, 2017 December 31, 2016 # of loans Amount # of loans Amount (Dollars in thousands) TDR 30-89 days delinquent classified as non-accrual: Commercial real estate 2 $ 167 2 $ 169 Residential mortgage and consumer 11 2,173 14 2,869 Total current TDR classified as non-accrual 13 $ 2,340 16 $ 3,038
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, 2017 and December 31, 2016 : March 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) With no related allowance: Multi-family $ 1,379 1,387 — 1,395 22 Commercial real estate 6,748 10,143 — 6,744 86 Commercial and industrial 1,656 2,211 — 1,645 28 Construction — — — — — Total commercial loans 9,783 13,741 — 9,784 136 Residential mortgage and consumer 12,499 16,092 — 10,795 114 With an allowance recorded: Multi-family — — — — — Commercial real estate — — — — — Commercial and industrial — — — — — Construction — — — — — Total commercial loans — — — — — Residential mortgage and consumer 14,908 15,541 1,717 13,689 117 Total: Multi-family 1,379 1,387 — 1,395 22 Commercial real estate 6,748 10,143 — 6,744 86 Commercial and industrial 1,656 2,211 — 1,645 28 Construction — — — — — Total commercial loans 9,783 13,741 — 9,784 136 Residential mortgage and consumer 27,407 31,633 1,717 24,484 231 Total impaired loans $ 37,190 45,374 1,717 34,268 367 December 31, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) With no related allowance: Multi-family $ 248 248 — 252 20 Commercial real estate 5,962 9,265 — 5,790 301 Commercial and industrial 3,370 3,972 — 3,953 169 Construction — — — — — Total commercial loans 9,580 13,485 — 9,995 490 Residential mortgage and consumer 11,030 14,565 — 9,899 483 With an allowance recorded: Multi-family — — — — — Commercial real estate — — — — — Commercial and industrial — — — — — Construction — — — — — Total commercial loans — — — — — Residential mortgage and consumer 13,794 14,382 1,601 13,689 479 Total: Multi-family 248 248 — 252 20 Commercial real estate 5,962 9,265 — 5,790 301 Commercial and industrial 3,370 3,972 — 3,953 169 Construction — — — — — Total commercial loans 9,580 13,485 — 9,995 490 Residential mortgage and consumer 24,824 28,947 1,601 23,588 962 Total impaired loans $ 34,404 42,432 1,601 33,583 1,452
Troubled Debt Restructured Loans	The following table presents the total TDR loans at March 31, 2017 and December 31, 2016 . There were three residential PCI loans that were classified as TDRs and are included in the table below at March 31, 2017 . There were three residential PCI loans that were classified as TDRs for the period ended December 31, 2016 . March 31, 2017 Accrual Non-accrual Total # of loans Amount # of loans Amount # of loans Amount (Dollars in thousands) Commercial loans: Multi-family — $ — 1 $ 246 1 $ 246 Commercial real estate — — 7 3,679 7 3,679 Commercial and industrial — — 2 1,656 2 1,656 Total commercial loans — — 10 5,581 10 5,581 Residential mortgage and consumer 47 12,243 65 15,164 112 27,407 Total 47 $ 12,243 75 $ 20,745 122 $ 32,988 December 31, 2016 Accrual Non-accrual Total # of loans Amount # of loans Amount # of loans Amount (Dollars in thousands) Commercial loans: Multi-family — $ — 1 $ 248 1 $ 248 Commercial real estate 2 352 4 3,240 6 3,592 Commercial and industrial — — 2 1,688 2 1,688 Total commercial loans 2 352 7 5,176 9 5,528 Residential mortgage and consumer 40 9,093 61 15,731 101 24,824 Total 42 $ 9,445 68 $ 20,907 110 $ 30,352
Schedule of Troubled Debt Restructurings	The following table presents information about TDRs that occurred during the three months ended March 31, 2017 and 2016 : Three Months Ended March 31, 2017 2016 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 Restructurings: Commercial real estate 1 166 166 2 442 442 Residential mortgage and consumer 13 2,879 2,779 7 958 958
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, 2017 and 2016 : Three Months Ended March 31, 2017 2016 Number of Loans Pre-modification Interest Yield Post- modification Interest Yield Number of Loans Pre-modification Interest Yield Post- modification Interest Yield Troubled Debt Restructurings: Commercial real estate 1 5.50 % 5.50 % 2 4.12 % 4.44 % Residential mortgage and consumer 13 4.27 % 3.54 % 7 6.05 % 3.99 %

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2017
Banking and Thrift [Abstract]
Summary of Deposits	Deposits are summarized as follows: March 31, 2017 December 31, 2016 (In thousands) Non-interest bearing: Checking accounts $ 2,234,674 2,173,493 Interest bearing: Checking accounts 3,954,999 3,916,208 Money market deposits 4,224,490 4,150,583 Savings 2,137,895 2,092,989 Certificates of deposit 2,823,965 2,947,560 Total deposits $ 15,376,023 15,280,833

Goodwill and Other Intangible27

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	The following table summarizes net intangible assets and goodwill at March 31, 2017 and December 31, 2016 : March 31, December 31, (In thousands) Mortgage servicing rights $ 15,172 14,889 Core deposit premiums 7,826 8,451 Other 906 928 Total other intangible assets 23,904 24,268 Goodwill 77,571 77,571 Goodwill and intangible assets $ 101,475 101,839
Summary of Intangible Assets	The following table summarizes other intangible assets as of March 31, 2017 and December 31, 2016 : Gross Intangible Asset Accumulated Amortization Valuation Allowance Net Intangible Assets (In thousands) March 31, 2017 Mortgage servicing rights $ 24,340 (9,003 ) (165 ) 15,172 Core deposit premiums 25,058 (17,232 ) — 7,826 Other 1,150 (244 ) — 906 Total other intangible assets $ 50,548 (26,479 ) (165 ) 23,904 December 31, 2016 Mortgage servicing rights $ 24,340 (9,286 ) (165 ) 14,889 Core deposit premiums 25,058 (16,607 ) — 8,451 Other 1,150 (222 ) — 928 Total other intangible assets $ 50,548 (26,115 ) (165 ) 24,268

Equity Incentive Plan (Tables)

Equity Incentive Plan (Tables)	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
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, 2017 and 2016 : Three Months Ended March 31, 2017 2016 (Dollars in thousands) Stock option expense $ 1,426 1,380 Restricted stock expense 3,431 2,953 Total share based compensation expense $ 4,857 4,333
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, 2017 : Number of Stock Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life (in years) Aggregate Intrinsic Value Outstanding at December 31, 2016 13,165,333 $11.74 8.2 $29,101 Granted — — 0.0 Exercised (578,800 ) 6.33 2.3 Forfeited (34,855 ) 12.54 Expired — — Outstanding at March 31, 2017 12,551,678 $11.99 8.2 $30,041 Exercisable at March 31, 2017 3,156,608 $10.39 6.6 $12,590
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, 2017 and changes therein during the three months ended: Number of Shares Awarded Weighted Average Grant Date fair Value Outstanding at December 31, 2016 5,876,491 $ 12.51 Granted 350,000 14.68 Vested (7,289 ) 11.22 Forfeited (9,019 ) 11.34 Outstanding and non vested at March 31, 2017 6,210,183 $ 12.63

Net Periodic Benefit Plan Exp29

Net Periodic Benefit Plan Expense (Tables)	3 Months Ended
	Mar. 31, 2017
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, 2017 2016 (In thousands) Service cost $ 371 894 Interest cost 378 474 Amortization of: Prior service cost — — Net loss 115 536 Total net periodic benefit cost $ 864 1,904

Derivatives and Hedging Activ30

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location	The following table presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 : Asset Derivatives Liability Derivatives At March 31, 2017 (1) At December 31, 2016 At March 31, 2017 (1) At December 31, 2016 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value (In thousands) Derivatives designated as hedging instruments: Interest Rate Swaps Other assets $ — Other assets $ 12,550 Other liabilities $ 358 Other liabilities $ — Total derivatives designated as hedging instruments $ — $ 12,550 $ 358 $ —
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table presents the effect of the Company’s derivative financial instruments on the Consolidated Statement of Income as of March 31, 2017 and 2016 . The Company did not any have derivatives outstanding prior to the quarter ended September 30, 2016. Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Three Months Ended March 31, Three Months Ended March 31, Three Months Ended March 31, 2017 2016 2017 2016 2017 2016 (In thousands) Derivatives in Cash Flow Hedging Relationships: Interest rate swaps $ 1,256 $ — Interest expense $ (807 ) $ — Other non-interest income $ — $ — Total $ 1,256 $ — $ (807 ) $ — $ — $ —
Offsetting Liabilities	The tabular disclosure of fair value provides the location that derivative assets and liabilities are presented on the Company's Consolidated Balance Sheets. Gross Amounts Not Offset Gross Amounts Recognized Gross Amounts Offset Net Amounts Presented Financial Instruments Cash Collateral Posted Net Amount (In thousands) March 31, 2017 Liabilities: Interest Rate Swaps (1) $ 358 $ — $ 358 $ — $ — $ 358 Total $ 358 $ — $ 358 $ — $ — $ 358 December 31, 2016 Assets: Interest Rate Swaps $ 12,550 $ — $ 12,550 $ — $ 12,550 $ — Total $ 12,550 $ — $ 12,550 $ — $ 12,550 $ —

Comprehensive Income (Tables)

Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2017
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, 2017 2016 Gross Tax Net Gross Tax Net (Dollars in thousands) Net income $ 73,264 (27,244 ) 46,020 71,124 (26,455 ) 44,669 Other comprehensive income: Change in funded status of retirement obligations 141 (58 ) 83 536 (219 ) 317 Unrealized gain on securities available-for-sale 4,291 (1,612 ) 2,679 16,500 (6,498 ) 10,002 Accretion of loss on securities reclassified to held to maturity from available for sale 352 (144 ) 208 480 (196 ) 284 Reclassification adjustment for security gains included in net income (1,227 ) 491 (736 ) (1,388 ) 555 (833 ) Other-than-temporary impairment accretion on debt securities 673 (274 ) 399 322 (131 ) 191 Net gains on derivatives arising during the period 2,063 (843 ) 1,220 — — — Total other comprehensive income 6,293 (2,440 ) 3,853 16,450 (6,489 ) 9,961 Total comprehensive income $ 79,557 (29,684 ) 49,873 87,574 (32,944 ) 54,630
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, 2017 and 2016 : Change in funded status of retirement obligations Accretion of loss on securities reclassified to held to maturity Unrealized gains on securities available-for-sale and gains included in net income Other-than- temporary impairment accretion on debt securities Unrealized gains on derivatives Total accumulated other comprehensive loss (Dollars in thousands) Balance - December 31, 2016 $ (4,895 ) (1,988 ) (12,271 ) (12,870 ) 7,424 (24,600 ) Net change 83 208 1,943 399 1,220 3,853 Balance - March 31, 2017 $ (4,812 ) (1,780 ) (10,328 ) (12,471 ) 8,644 (20,747 ) Balance - December 31, 2015 $ (12,366 ) (3,080 ) 1,371 (13,750 ) — (27,825 ) Net change 317 284 9,169 191 — 9,961 Balance - March 31, 2016 $ (12,049 ) (2,796 ) 10,540 (13,559 ) — (17,864 ) 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, 2017 2016 (In thousands) Reclassification adjustment for gains included in net income Gain on security transactions, net $ (1,227 ) (1,388 ) Change in funded status of retirement obligations (1) Compensation and fringe benefits: Amortization of prior service cost — — Amortization of net loss 120 536 Compensation and fringe benefits 120 536 Interest Expense Reclassification adjustment for unrealized losses on derivatives 807 — Total before tax (300 ) (852 ) Income tax benefit 133 336 Net of tax $ (167 ) (516 ) (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, 2017
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 and liabilities measured at fair value on a recurring basis at March 31, 2017 and December 31, 2016 . Carrying Value at March 31, 2017 Total Level 1 Level 2 Level 3 (In thousands) Assets: Securities available for sale: Equity securities $ 5,458 5,458 — — Mortgage-backed securities: Federal Home Loan Mortgage Corporation 622,069 — 622,069 — Federal National Mortgage Association 1,094,876 — 1,094,876 — Government National Mortgage Association 44,857 — 44,857 — Total mortgage-backed securities available-for-sale 1,761,802 — 1,761,802 — Total securities available-for-sale $ 1,767,260 5,458 1,761,802 — Liabilities: Derivative financial instruments (1) $ 358 — 358 — (1) In accordance with the CME rulebook changes effective January 3, 2017, the gross amounts recognized are inclusive of accrued interest and variation margin posted by the CME. Carrying Value at December 31, 2016 Total Level 1 Level 2 Level 3 (In thousands) Assets: Securities available for sale: Equity securities $ 6,660 6,660 — — Mortgage-backed securities: Federal Home Loan Mortgage Corporation 598,439 — 598,439 — Federal National Mortgage Association 1,008,587 — 1,008,587 — Government National Mortgage Association 46,747 — 46,747 — Total mortgage-backed securities available-for-sale 1,653,773 — 1,653,773 — Total securities available-for-sale $ 1,660,433 6,660 1,653,773 — Derivative financial instruments $ 12,550 — 12,550 —
Carrying Value Of Our Assets Measured At Fair Value On A Non-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 non-recurring basis at March 31, 2017 and December 31, 2016 . For the three months ended March 31, 2017 there was no change to the carrying value of mortgage servicing rights and loans held for sale measured at fair value on a non-recurring basis. For the year ended December 31, 2016 , there was no change to carrying value of other real estate owned measured at fair value on a non-recurring basis. Carrying Value at March 31, 2017 Security Type Valuation Technique Unobservable Input Range Weighted Average Total Level 1 Level 2 Level 3 (In thousands) Impaired loans Market comparable Lack of marketability 1.0% - 45.0% 45.00% $ 24 — — 24 Other real estate owned Market comparable Lack of marketability 0.0% - 25.0% 5.82% 215 — — 215 $ 239 — — 239 Carrying Value at December 31, 2016 Security Type Valuation Technique Unobservable Input Range Weighted Average Total Level 1 Level 2 Level 3 (In thousands) MSR, net Estimated cash flow Prepayment speeds 3.15% - 24.18% 9.84% $ 12,877 — — 12,877 Impaired loans Estimated cash flow Lack of marketability and probability of default 22.0% - 29.0% 26.0% 1,403 — — 1,403 Loans held for sale Market comparable Lack of marketability 2.5% - 4.5% 3.45% 313 — — 313 $ 14,593 — — 14,593
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, 2017 Carrying Estimated Fair Value value Total Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 165,914 165,914 165,914 — — Securities available-for-sale 1,767,260 1,767,260 5,458 1,761,802 — Securities held-to-maturity 1,704,406 1,736,210 — 1,658,303 77,907 Stock in FHLB 251,805 251,805 251,805 — — Loans held for sale 4,908 4,908 — 4,908 — Net loans 19,261,271 18,943,156 — — 18,943,156 Financial liabilities: Deposits, other than time deposits $ 12,552,058 12,552,058 12,552,058 — — Time deposits 2,823,965 2,811,589 — 2,811,589 — Borrowed funds 5,093,790 5,093,224 — 5,093,224 — December 31, 2016 Carrying Estimated Fair Value value Total Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 164,178 164,178 164,178 — — Securities available-for-sale 1,660,433 1,660,433 6,660 1,653,773 — Securities held-to-maturity 1,755,556 1,782,801 — 1,703,559 79,242 Stock in FHLB 237,878 237,878 237,878 — — Loans held for sale 38,298 38,298 — 38,298 — Net loans 18,569,855 18,391,018 — — 18,391,018 Financial liabilities: Deposits, other than time deposits $ 12,333,273 12,333,273 12,333,273 — — Time deposits 2,947,560 2,938,137 — 2,938,137 — Borrowed funds 4,546,251 4,545,745 — 4,545,745 —

Stock Transactions (Details)

Stock Transactions (Details) - USD ($)	Apr. 28, 2016	Jun. 09, 2015	Mar. 16, 2015	Mar. 31, 2017	Mar. 31, 2016
Equity [Abstract]
Percentage of shares to be repurchased (percentage)	10.00%	10.00%	5.00%
Number of shares authorized to be repurchased (shares)	31,481,189	34,779,211	17,911,561
Purchase of treasury stock (shares)				4,270	12,150,000
Stock repurchased during period, value				$ 61,090	$ 140,192,000
Stock repurchase cost, per share (usd per share)				$ 14.31

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, 2017	Mar. 31, 2016
Earnings for basic and diluted earnings per common share
Earnings applicable to common stockholders	$ 46,020	$ 44,669
Shares
Income available to common stockholders, Basic (shares)	291,185,408	309,166,680
Effect of dilutive common stock equivalents, Basic (shares)	2,222,014	3,785,308
Income available to common stockholders, Diluted (shares)	293,407,422	312,951,988
Earnings per common share
Basic earnings per common share (usd per share)	$ 0.16	$ 0.14
Diluted earnings per common share (usd per share)	$ 0.16	$ 0.14
Equity awards
Earnings per common share
Securities excluded from computation of diluted earnings per share (shares)	10,861,826	11,667,654

Securities (Narrative) (Details

Securities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Investment [Line Items]
Carrying value of held to maturity security	$ 1,704,406,000		$ 1,755,556,000
Estimated fair value	1,736,210,000		$ 1,782,801,000
Non credit-related OTTI	21,100,000
Non credit-related OTTI, after-tax	12,500,000
Proceeds from sales of securities held to maturity	0	$ 0
Gross realized gain from Held to maturity	(1,900,000)
Corporate and other debt securities
Investment [Line Items]
Carrying value of held to maturity security	39,500,000
Estimated fair value	$ 77,900,000
Debt maturities, term (years)	20 years
Equity securities
Investment [Line Items]
Gross realized gain from sale of Available-for-sale securities		1,400,000
Proceeds from sale of Available for sale securities		$ 33,100,000
TruP Security
Investment [Line Items]
Gross realized gain from sale of Available-for-sale securities	$ 1,200,000
Proceeds from sales of securities held to maturity	3,100,000
Proceeds from sale of Available for sale securities	47,400,000
Non Investment Grade | Corporate and other debt securities
Investment [Line Items]
Carrying value of held to maturity security	37,500,000
Estimated fair value	71,500,000
Securities Pledged as Collateral
Investment [Line Items]
Estimated fair value	773,700,000
Held-to-maturity securities pledged as collateral	$ 781,300,000

Securities (Summary of Securiti

Securities (Summary of Securities- AFS) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Carrying value	$ 1,783,285	$ 1,679,520
Gross unrealized gains	4,096	5,567
Gross unrealized losses	20,121	24,654
Estimated fair value	1,767,260	1,660,433
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Carrying value	4,849	5,825
Gross unrealized gains	703	918
Gross unrealized losses	94	83
Estimated fair value	5,458	6,660
Mortgage-backed securities:
Schedule of Available-for-sale Securities [Line Items]
Carrying value	1,778,436	1,673,695
Gross unrealized gains	3,393	4,649
Gross unrealized losses	20,027	24,571
Estimated fair value	1,761,802	1,653,773
Federal Home Loan Mortgage Corporation
Schedule of Available-for-sale Securities [Line Items]
Carrying value	625,875	603,774
Gross unrealized gains	1,575	1,971
Gross unrealized losses	5,381	7,306
Estimated fair value	622,069	598,439
Federal National Mortgage Association
Schedule of Available-for-sale Securities [Line Items]
Carrying value	1,106,936	1,022,383
Gross unrealized gains	1,818	2,678
Gross unrealized losses	13,878	16,474
Estimated fair value	1,094,876	1,008,587
Government National Mortgage Association
Schedule of Available-for-sale Securities [Line Items]
Carrying value	45,625	47,538
Gross unrealized gains	0	0
Gross unrealized losses	768	791
Estimated fair value	$ 44,857	$ 46,747

Securities (Summary of Securi37

Securities (Summary of Securities- HTM) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Net unrealized losses	$ 88,997	$ 95,743	$ 99,088	$ 100,200
Carrying value	1,704,406	1,755,556
Gross unrealized losses	14,190	18,891
Estimated fair value	1,736,210	1,782,801
Held-to-maturity:
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	1,728,500	1,780,677
Net unrealized losses	24,094	25,121
Carrying value	1,704,406	1,755,556
Gross unrecognized gains	45,994	46,136
Gross unrealized losses	14,190	18,891
Estimated fair value	1,736,210	1,782,801
Government-sponsored enterprises
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	2,106	2,128
Net unrealized losses	0	0
Carrying value	2,106	2,128
Gross unrecognized gains	9	12
Gross unrealized losses	0	0
Estimated fair value	2,115	2,140
Municipal bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	27,830	37,978
Net unrealized losses	0	0
Carrying value	27,830	37,978
Gross unrecognized gains	1,474	1,515
Gross unrealized losses	0	0
Estimated fair value	29,304	39,493
Corporate and other debt securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	65,614	65,852
Net unrealized losses	21,084	21,760
Carrying value	44,530	44,092
Gross unrecognized gains	38,458	40,153
Gross unrealized losses	0	0
Estimated fair value	82,988	84,245
Total debt securities held-to-maturity
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	95,550	105,958
Net unrealized losses	21,084	21,760
Carrying value	74,466	84,198
Gross unrecognized gains	39,941	41,680
Gross unrealized losses	0	0
Estimated fair value	114,407	125,878
Mortgage-backed securities:
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	1,632,950	1,674,719
Net unrealized losses	3,010	3,361
Carrying value	1,629,940	1,671,358
Gross unrecognized gains	6,053	4,456
Gross unrealized losses	14,190	18,891
Estimated fair value	1,621,803	1,656,923
Federal Home Loan Mortgage Corporation
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	421,063	411,692
Net unrealized losses	1,395	1,559
Carrying value	419,668	410,133
Gross unrecognized gains	1,178	793
Gross unrealized losses	2,689	3,502
Estimated fair value	418,157	407,424
Federal National Mortgage Association
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	1,196,452	1,246,635
Net unrealized losses	1,615	1,802
Carrying value	1,194,837	1,244,833
Gross unrecognized gains	4,851	3,635
Gross unrealized losses	11,501	15,389
Estimated fair value	1,188,187	1,233,079
Government National Mortgage Association
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	15,435	16,392
Net unrealized losses	0	0
Carrying value	15,435	16,392
Gross unrecognized gains	24	28
Gross unrealized losses	0	0
Estimated fair value	$ 15,459	$ 16,420

Securities (Amortized Cost and

Securities (Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Carrying value	$ 1,704,406	$ 1,755,556
Total, Estimated fair value	1,736,210	$ 1,782,801
Debt Securities Other than Securities Pledged
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less	23,201
Due after one year through five years	2,181
Due after five years through ten years	5,000
Due after ten years	44,084
Carrying value	74,466
Due in one year or less, Estimated fair value	23,201
Due after one year through five years, Estimated fair value	2,190
Due after five years through ten years, Estimated fair value	5,080
Due after ten years, Estimated fair value	83,936
Total, Estimated fair value	$ 114,407

Securities (Investment Securiti

Securities (Investment Securities, Continuous Unrealized Loss Position And Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available-for-sale, Estimated fair value
Less than 12 months	$ 1,128,570	$ 1,220,619
12 months or more	35,148	37,845
Total	1,163,718	1,258,464
Available-for-sale, Unrealized losses
Less than 12 months	19,616	24,071
12 months or more	505	583
Total	20,121	24,654
Held-to-maturity Securities, Estimated Fair Value
Less than 12 months	975,800	1,309,860
12 months or more	15,582	3,623
Total	991,382	1,313,483
Held-to-maturity Securities, Unrealized Losses
Less than 12 months	13,990	18,743
12 months or more	200	148
Total	14,190	18,891
Estimated fair value, Less than 12 months, Total	2,104,370	2,530,479
Unrealized losses, Less than 12 months, Total	33,606	42,814
Estimated fair value, 12 months or more, Total	50,730	41,468
Unrealized losses, 12 months or more, Total	705	731
Estimated fair value, Total	2,155,100	2,571,947
Unrealized losses, Total	34,311	43,545
Equity securities
Available-for-sale, Estimated fair value
Less than 12 months	4,734	4,722
12 months or more	0	0
Total	4,734	4,722
Available-for-sale, Unrealized losses
Less than 12 months	94	83
12 months or more	0	0
Total	94	83
Federal Home Loan Mortgage Corporation
Available-for-sale, Estimated fair value
Less than 12 months	354,274	406,878
12 months or more	11,829	12,756
Total	366,103	419,634
Available-for-sale, Unrealized losses
Less than 12 months	5,341	7,220
12 months or more	40	86
Total	5,381	7,306
Held-to-maturity Securities, Estimated Fair Value
Less than 12 months	301,831	339,666
12 months or more	3,325	3,623
Total	305,156	343,289
Held-to-maturity Securities, Unrealized Losses
Less than 12 months	2,561	3,354
12 months or more	128	148
Total	2,689	3,502
Federal National Mortgage Association
Available-for-sale, Estimated fair value
Less than 12 months	724,705	762,272
12 months or more	23,319	25,089
Total	748,024	787,361
Available-for-sale, Unrealized losses
Less than 12 months	13,413	15,977
12 months or more	465	497
Total	13,878	16,474
Held-to-maturity Securities, Estimated Fair Value
Less than 12 months	673,969
12 months or more	12,257
Total	686,226
Held-to-maturity Securities, Unrealized Losses
Less than 12 months	11,429
12 months or more	72
Total	11,501
Government National Mortgage Association
Available-for-sale, Estimated fair value
Less than 12 months	44,857
12 months or more	0
Total	44,857
Available-for-sale, Unrealized losses
Less than 12 months	768
12 months or more	0
Total	768
Government National Mortgage Association
Available-for-sale, Estimated fair value
Less than 12 months		46,747
12 months or more		0
Total		46,747
Available-for-sale, Unrealized losses
Less than 12 months		791
12 months or more		0
Total		791
Federal National Mortgage Association
Held-to-maturity Securities, Estimated Fair Value
Less than 12 months		970,194
12 months or more		0
Total		970,194
Held-to-maturity Securities, Unrealized Losses
Less than 12 months		15,389
12 months or more		0
Total		15,389
Mortgage-backed securities:
Available-for-sale, Estimated fair value
Less than 12 months	1,123,836	1,215,897
12 months or more	35,148	37,845
Total	1,158,984	1,253,742
Available-for-sale, Unrealized losses
Less than 12 months	19,522	23,988
12 months or more	505	583
Total	$ 20,027	$ 24,571

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, 2017	Mar. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance of credit related OTTI, beginning of period	$ 95,743	$ 100,200
Initial credit impairments	0	0
Subsequent credit impairments	0	0
Accretion of credit loss impairment due to an increase in expected cash flows	(2,935)	(1,112)
Reductions for securities sold or paid off during the period	(3,811)	0
Balance of credit related OTTI, end of period	$ 88,997	$ 99,088

Loans Receivable, Net (Narrativ

Loans Receivable, Net (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2017USD ($)loan	Mar. 31, 2016USD ($)loan	Dec. 31, 2016USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans acquired	$ 33,000
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	8,823,000		$ 8,956,000
Loans, Individually evaluated for impairment	37,190,000		34,404,000
Related Allowance	1,717,000		$ 1,601,000
Interest income received and recognized on loans	$ 367,000	$ 393,000
Troubled debt restructured, number of loans | loan	122		110
Recorded investment	$ 32,988,000		$ 30,352,000
Allowance for loan losses, individually evaluated for impairment	1,717,000		1,601,000
Allowance for loan losses, Charge-offs	(3,005,000)		(14,997,000)
Collateral Dependant TDRs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Related Allowance	1,700,000		1,600,000
Allowance for loan losses, individually evaluated for impairment	1,700,000		$ 1,600,000
Allowance for loan losses, Charge-offs	(100,000)	$ 0
Commercial Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding minimum balance of loans to be evaluated for impairment individually, greater than	1,000,000
Outstanding minimum balance of loans that are evaluated for impairment individually	1,000,000
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, greater than	500,000
Outstanding minimum balance of loans that are evaluated for impairment individually	$ 2,000,000
PCI Loans | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructured, number of loans | loan	3		3
Marathon Banking Corporation and Marathon National Bank of New York | PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	$ 8,800,000		$ 9,000,000
Financing Receivables, 1 to 29 Days Past Due | 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	7,500,000		7,700,000
Financing Receivables, 30 to 89 Days Past Due | 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	0
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	$ 1,300,000		1,300,000
Watch | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period in days	59 days
Watch | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period in days	30 days
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Related Allowance	$ 0		$ 0
Troubled debt restructured, number of loans | loan	10		9
Recorded investment	$ 5,581,000		$ 5,528,000
Commercial Portfolio Segment | Construction Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Individually evaluated for impairment	0		0
Related Allowance	0		0
Allowance for loan losses, individually evaluated for impairment	0		0
Loans modified as TDR in the last 12 months for which there was a default payment | loan		1
Recorded investment		$ 132,000
Allowance for loan losses, Charge-offs	(100,000)		(52,000)
Commercial Portfolio Segment | Commercial Real Estate Sector | Retail Site
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Individually evaluated for impairment	6,748,000		5,962,000
Related Allowance	$ 0		$ 0
Troubled debt restructured, number of loans | loan	7		6
Recorded investment	$ 3,679,000		$ 3,592,000
Allowance for loan losses, individually evaluated for impairment	$ 0		0
Number of Loans | loan	1	2
Loans modified as TDR in the last 12 months for which there was a default payment | loan	2	3
Recorded investment	$ 498,000	$ 246,000
Allowance for loan losses, Charge-offs	(419,000)		(455,000)
Post- modification Recorded Investment	166,000	$ 442,000
Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Individually evaluated for impairment	26,824,000		24,453,000
Allowance for loan losses, individually evaluated for impairment	$ 1,676,000		1,581,000
Loans modified as TDR in the last 12 months for which there was a default payment | loan	9	4
Recorded investment	$ 1,600,000	$ 880,000
Allowance for loan losses, Charge-offs	$ (727,000)		$ (9,425,000)
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period in days	90 days
Special Mention Residential | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period in days	89 days
Special Mention Residential | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period in days	60 days
Substandard Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period in days	90 days

Loans Receivable, Net (Summary

Loans Receivable, Net (Summary of Loan Receivable) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans excluding PCI loans	$ 19,496,605	$ 18,801,746
PCI loans	8,823	8,956
Net unamortized premiums and deferred loan costs	(13,245)	(12,474)
Allowance for loan losses	(230,912)	(228,373)	$ (216,613)	$ (218,505)
Net loans	19,261,271	18,569,855
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans excluding PCI loans	14,136,321	13,494,451
Commercial Portfolio Segment | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans excluding PCI loans	1,374,599	1,275,283
Commercial Portfolio Segment | Construction Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans excluding PCI loans	335,341	314,843
Consumer Portfolio Segment | Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans excluding PCI loans	4,749,058	4,710,373
Consumer Portfolio Segment | Consumer and Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans excluding PCI loans	611,226	596,922
Retail Site | Commercial Portfolio Segment | Commercial Real Estate Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans excluding PCI loans	4,630,407	4,445,194
Multifamily | Commercial Portfolio Segment | Commercial Real Estate Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans excluding PCI loans	$ 7,795,974	$ 7,459,131

Loans Receivable, Net (Purchase

Loans Receivable, Net (Purchased Credit Impaired Loans) (Details) - PCI Loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accretable Yeild [Roll Forward]
Balance, beginning of period	$ 1,451	$ 449
Accretion	(44)	(67)
Net reclassification from non-accretable difference (1)	0	1,221
Balance, ending of period	$ 1,407	$ 1,603

Loans Receivable, Net (Summar44

Loans Receivable, Net (Summary of Analysis of the Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of the period	$ 228,373	$ 218,505
Loans charged off	(3,005)	(7,977)
Recoveries	1,544	1,085
Net charge-offs	(1,461)	(6,892)
Provision for loan losses	4,000	5,000
Balance at end of the period	$ 230,912	$ 216,613

Loans Receivable, Net (Summar45

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, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	$ 228,373	$ 218,505
Allowance for loan losses, Charge-offs	(3,005)	(14,997)
Allowance for loan losses, Recoveries	1,544	5,115
Allowance for loan losses, Provision	4,000	19,750
Allowance for loan losses, Ending balance	230,912	228,373
Allowance for loan losses, individually evaluated for impairment	1,717	1,601
Allowance for loan losses, collectively evaluated for impairment	229,195	226,772
Loans, Individually evaluated for impairment	37,190	34,404
Loans, Collectively evaluated for impairment	19,459,415	18,767,342
Loan, Loans acquired with deteriorated credit quality	19,496,605	18,801,746
Ending Balance	19,505,428	18,810,702
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	2,190	1,306
Allowance for loan losses, Charge-offs	0	0
Allowance for loan losses, Recoveries	0	0
Allowance for loan losses, Provision	1,193	884
Allowance for loan losses, Ending balance	3,383	2,190
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	3,383	2,190
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	8,823	8,956
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
Consumer Portfolio Segment | Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	19,831	31,443
Allowance for loan losses, Charge-offs	(727)	(9,425)
Allowance for loan losses, Recoveries	1,117	1,631
Allowance for loan losses, Provision	(1,246)	(3,818)
Allowance for loan losses, Ending balance	18,975	19,831
Allowance for loan losses, individually evaluated for impairment	1,676	1,581
Allowance for loan losses, collectively evaluated for impairment	17,299	18,250
Loans, Individually evaluated for impairment	26,824	24,453
Loans, Collectively evaluated for impairment	4,722,234	4,685,920
Loan, Loans acquired with deteriorated credit quality	4,749,058	4,710,373
Ending Balance	4,750,529	4,711,880
Consumer Portfolio Segment | Consumer and Other Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	2,850	3,155
Allowance for loan losses, Charge-offs	(2)	(419)
Allowance for loan losses, Recoveries	20	102
Allowance for loan losses, Provision	(98)	12
Allowance for loan losses, Ending balance	2,770	2,850
Allowance for loan losses, individually evaluated for impairment	41	20
Allowance for loan losses, collectively evaluated for impairment	2,729	2,830
Loans, Individually evaluated for impairment	583	371
Loans, Collectively evaluated for impairment	610,643	596,551
Loan, Loans acquired with deteriorated credit quality	611,226	596,922
Ending Balance	611,558	597,265
Consumer Portfolio Segment | 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	1,471	1,507
Consumer Portfolio Segment | 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	332	343
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan, Loans acquired with deteriorated credit quality	14,136,321	13,494,451
Commercial Portfolio Segment | Construction Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	11,653	6,794
Allowance for loan losses, Charge-offs	(100)	(52)
Allowance for loan losses, Recoveries	0	267
Allowance for loan losses, Provision	(859)	4,644
Allowance for loan losses, Ending balance	10,694	11,653
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	10,694	11,653
Loans, Individually evaluated for impairment	0	0
Loans, Collectively evaluated for impairment	335,341	314,843
Loan, Loans acquired with deteriorated credit quality	335,341	314,843
Ending Balance	335,341	314,843
Commercial Portfolio Segment | 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	0	0
Commercial Portfolio Segment | Commercial and Industrial Sector
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	43,492	40,585
Allowance for loan losses, Charge-offs	(1,751)	(4,485)
Allowance for loan losses, Recoveries	72	541
Allowance for loan losses, Provision	1,942	6,851
Allowance for loan losses, Ending balance	43,755	43,492
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	43,755	43,492
Loans, Individually evaluated for impairment	1,656	3,370
Loans, Collectively evaluated for impairment	1,372,943	1,271,913
Loan, Loans acquired with deteriorated credit quality	1,374,599	1,275,283
Ending Balance	1,374,599	1,275,283
Commercial Portfolio Segment | Commercial and Industrial Sector | 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	0	0
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Sector
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	95,561	88,223
Allowance for loan losses, Charge-offs	(6)	(161)
Allowance for loan losses, Recoveries	280	1,885
Allowance for loan losses, Provision	(5,752)	5,614
Allowance for loan losses, Ending balance	90,083	95,561
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	90,083	95,561
Loans, Individually evaluated for impairment	1,379	248
Loans, Collectively evaluated for impairment	7,794,595	7,458,883
Loan, Loans acquired with deteriorated credit quality	7,795,974	7,459,131
Ending Balance	7,795,974	7,459,131
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Sector | 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	0	0
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Sector
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	52,796	46,999
Allowance for loan losses, Charge-offs	(419)	(455)
Allowance for loan losses, Recoveries	55	689
Allowance for loan losses, Provision	8,820	5,563
Allowance for loan losses, Ending balance	61,252	52,796
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	61,252	52,796
Loans, Individually evaluated for impairment	6,748	5,962
Loans, Collectively evaluated for impairment	4,623,659	4,439,232
Loan, Loans acquired with deteriorated credit quality	4,630,407	4,445,194
Ending Balance	4,637,427	4,452,300
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Sector | 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	$ 7,020	$ 7,106

Loans Receivable, Net (Schedule

Loans Receivable, Net (Schedule of Risk Category of Loans by Class of Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	$ 19,496,605	$ 18,801,746
Pass
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	17,619,803	17,177,368
Watch
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	1,297,610	1,099,078
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	270,097	337,848
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	309,095	187,452
Doubtful
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
Commercial Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	14,136,321	13,494,451
Commercial Portfolio Segment | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	335,341	314,843
Commercial Portfolio Segment | Pass
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	12,381,917	11,993,617
Commercial Portfolio Segment | Pass | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	233,837	230,630
Commercial Portfolio Segment | Watch
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	1,267,925	1,071,578
Commercial Portfolio Segment | Watch | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	95,841	76,773
Commercial Portfolio Segment | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	261,742	326,890
Commercial Portfolio Segment | Special Mention | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	1,200	3,200
Commercial Portfolio Segment | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	224,737	102,366
Commercial Portfolio Segment | Substandard | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	4,463	4,240
Commercial Portfolio Segment | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Commercial Portfolio Segment | Doubtful | Construction Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Commercial Portfolio Segment | Loss
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Commercial Portfolio Segment | Commercial and Industrial Sector
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	1,374,599	1,275,283
Commercial Portfolio Segment | Commercial and Industrial Sector | Pass
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	924,256	900,190
Commercial Portfolio Segment | Commercial and Industrial Sector | Watch
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	420,606	344,628
Commercial Portfolio Segment | Commercial and Industrial Sector | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	24,242	23,588
Commercial Portfolio Segment | Commercial and Industrial Sector | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	5,495	6,877
Commercial Portfolio Segment | Commercial and Industrial Sector | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Commercial Portfolio Segment | Commercial and Industrial Sector | Loss
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Sector
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	7,795,974	7,459,131
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Sector | Pass
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	7,201,975	6,961,809
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Sector | Watch
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	353,911	276,858
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Sector | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	139,948	165,948
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Sector | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	100,140	54,516
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Sector | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Sector | Loss
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Sector
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	4,630,407	4,445,194
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Sector | Pass
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	4,021,849	3,900,988
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Sector | Watch
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	397,567	373,319
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Sector | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	96,352	134,154
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Sector | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	114,639	36,733
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Sector | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Sector | Loss
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Consumer Portfolio Segment | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	4,749,058	4,710,373
Consumer Portfolio Segment | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	611,226	596,922
Consumer Portfolio Segment | Pass | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	4,642,980	4,600,611
Consumer Portfolio Segment | Pass | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	594,906	583,140
Consumer Portfolio Segment | Watch | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	21,658	21,873
Consumer Portfolio Segment | Watch | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	8,027	5,627
Consumer Portfolio Segment | Special Mention | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	7,764	10,239
Consumer Portfolio Segment | Special Mention | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	591	719
Consumer Portfolio Segment | Substandard | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	76,656	77,650
Consumer Portfolio Segment | Substandard | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	7,702	7,436
Consumer Portfolio Segment | Doubtful | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Consumer Portfolio Segment | Doubtful | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Consumer Portfolio Segment | Loss | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loan, Loans acquired with deteriorated credit quality	0	0
Consumer Portfolio Segment | 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, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 171,591	$ 162,814
Current	19,325,014	18,638,932
Total Loans Receivable	19,496,605	18,801,746
30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	86,031	42,383
60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	18,057	45,597
Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	67,503	74,834
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	69,762	56,302
Current	14,066,559	13,438,149
Total Loans Receivable	14,136,321	13,494,451
Commercial Portfolio Segment | Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	335,341	314,843
Total Loans Receivable	335,341	314,843
Commercial Portfolio Segment | 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	54,728	12,704
Commercial Portfolio Segment | 30-59 Days | Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,145	33,948
Commercial Portfolio Segment | 60-89 Days | Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,889	9,650
Commercial Portfolio Segment | Greater than 90 Days | Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | Commercial and Industrial Sector
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,190	4,720
Current	1,372,409	1,270,563
Total Loans Receivable	1,374,599	1,275,283
Commercial Portfolio Segment | Commercial and Industrial Sector | 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,062	864
Commercial Portfolio Segment | Commercial and Industrial Sector | 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	575	885
Commercial Portfolio Segment | Commercial and Industrial Sector | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	553	2,971
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,929	6,605
Current	7,781,045	7,452,526
Total Loans Receivable	7,795,974	7,459,131
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Loans | 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,702	5,272
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Loans | 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	1,099
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Loans | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	227	234
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	52,643	44,977
Current	4,577,764	4,400,217
Total Loans Receivable	4,630,407	4,445,194
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Loans | 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	38,964	6,568
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Loans | 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,570	31,964
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Loans | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,109	6,445
Consumer Portfolio Segment | Consumer and Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,740	13,411
Current	595,486	583,511
Total Loans Receivable	611,226	596,922
Consumer Portfolio Segment | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	86,089	93,101
Current	4,662,969	4,617,272
Total Loans Receivable	4,749,058	4,710,373
Consumer Portfolio Segment | 30-59 Days | Consumer and Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,027	5,627
Consumer Portfolio Segment | 30-59 Days | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	23,276	24,052
Consumer Portfolio Segment | 60-89 Days | Consumer and Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	591	719
Consumer Portfolio Segment | 60-89 Days | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,321	10,930
Consumer Portfolio Segment | Greater than 90 Days | Consumer and Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,122	7,065
Consumer Portfolio Segment | Greater than 90 Days | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 54,492	$ 58,119

Loans Receivable, Net (Non-Accr

Loans Receivable, Net (Non-Accrual Loans Status) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	500	512
Non-accrual, Amount | $	$ 87,083	$ 94,274
Financing Receivables, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	13	16
Non-accrual, Amount | $	$ 2,340	$ 3,038
Financing Receivables, 1 to 29 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	33	26
Non-accrual, Amount | $	$ 6,995	$ 6,318
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	30	34
Non-accrual, Amount | $	$ 10,925	$ 14,346
Commercial Portfolio Segment | Financing Receivables, 1 to 29 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	5	3
Non-accrual, Amount | $	$ 1,037	$ 597
Commercial Portfolio Segment | Commercial and Industrial Sector
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	4	8
Non-accrual, Amount | $	$ 2,209	$ 4,659
Commercial Portfolio Segment | Commercial and Industrial Sector | Financing Receivables, 1 to 29 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	1	1
Non-accrual, Amount | $	$ 282	$ 286
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	2	2
Non-accrual, Amount | $	$ 473	$ 482
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Loans | Financing Receivables, 1 to 29 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	1	1
Non-accrual, Amount | $	$ 246	$ 248
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	24	24
Non-accrual, Amount | $	$ 8,243	$ 9,205
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Loans | Financing Receivables, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	2	2
Non-accrual, Amount | $	$ 167	$ 169
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Loans | Financing Receivables, 1 to 29 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	3	1
Non-accrual, Amount | $	$ 509	$ 63
Consumer Portfolio Segment | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	470	478
Non-accrual, Amount | $	$ 76,158	$ 79,928
Consumer Portfolio Segment | Financing Receivables, 30 to 89 Days Past Due | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	11	14
Non-accrual, Amount | $	$ 2,173	$ 2,869
Consumer Portfolio Segment | Financing Receivables, 1 to 29 Days Past Due | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual: # of loans | loan	28	23
Non-accrual, Amount | $	$ 5,958	$ 5,721

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, 2017	Dec. 31, 2016
Recorded Investment
Total:	$ 37,190	$ 34,404
Unpaid Principal Balance
Total:	45,374	42,432
Related Allowance	1,717	1,601
Average Recorded Investment
Total:	34,268	33,583
Interest Income Recognized
Total:	367	1,452
Commercial Portfolio Segment
Recorded Investment
With no related allowance:	9,783	9,580
With an allowance recorded:	0	0
Total:	9,783	9,580
Unpaid Principal Balance
With no related allowance:	13,741	13,485
With an allowance recorded:	0	0
Total:	13,741	13,485
Related Allowance	0	0
Average Recorded Investment
With no related allowance:	9,784	9,995
With an allowance recorded:	0	0
Total:	9,784	9,995
Interest Income Recognized
With no related allowance:	136	490
With an allowance recorded:	0	0
Total:	136	490
Commercial Portfolio Segment | Construction Loans
Recorded Investment
With no related allowance:	0	0
With an allowance recorded:	0	0
Total:	0	0
Unpaid Principal Balance
With no related allowance:	0	0
With an allowance recorded:	0	0
Total:	0	0
Related Allowance	0	0
Average Recorded Investment
With no related allowance:	0	0
With an allowance recorded:	0	0
Total:	0	0
Interest Income Recognized
With no related allowance:	0	0
With an allowance recorded:	0	0
Total:	0	0
Commercial Portfolio Segment | Commercial and Industrial Sector
Recorded Investment
With no related allowance:	1,656	3,370
With an allowance recorded:	0	0
Total:	1,656	3,370
Unpaid Principal Balance
With no related allowance:	2,211	3,972
With an allowance recorded:	0	0
Total:	2,211	3,972
Related Allowance	0	0
Average Recorded Investment
With no related allowance:	1,645	3,953
With an allowance recorded:	0	0
Total:	1,645	3,953
Interest Income Recognized
With no related allowance:	28	169
With an allowance recorded:	0	0
Total:	28	169
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Loans
Recorded Investment
With no related allowance:	1,379	248
With an allowance recorded:	0	0
Total:	1,379	248
Unpaid Principal Balance
With no related allowance:	1,387	248
With an allowance recorded:	0	0
Total:	1,387	248
Related Allowance	0	0
Average Recorded Investment
With no related allowance:	1,395	252
With an allowance recorded:	0	0
Total:	1,395	252
Interest Income Recognized
With no related allowance:	22	20
With an allowance recorded:	0	0
Total:	22	20
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Loans
Recorded Investment
With no related allowance:	6,748	5,962
With an allowance recorded:	0	0
Total:	6,748	5,962
Unpaid Principal Balance
With no related allowance:	10,143	9,265
With an allowance recorded:	0	0
Total:	10,143	9,265
Related Allowance	0	0
Average Recorded Investment
With no related allowance:	6,744	5,790
With an allowance recorded:	0	0
Total:	6,744	5,790
Interest Income Recognized
With no related allowance:	86	301
With an allowance recorded:	0	0
Total:	86	301
Consumer Portfolio Segment | Residential And Consumer
Recorded Investment
With no related allowance:	12,499	11,030
With an allowance recorded:	14,908	13,794
Total:	27,407	24,824
Unpaid Principal Balance
With no related allowance:	16,092	14,565
With an allowance recorded:	15,541	14,382
Total:	31,633	28,947
Related Allowance	1,717	1,601
Average Recorded Investment
With no related allowance:	10,795	9,899
With an allowance recorded:	13,689	13,689
Total:	24,484	23,588
Interest Income Recognized
With no related allowance:	114	483
With an allowance recorded:	117	479
Total:	$ 231	$ 962

Loans Receivable, Net (Troubled

Loans Receivable, Net (Troubled Debt Restructured Loans) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)loan
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	47	42
Accrual, amount | $	$ 12,243	$ 9,445
Non-accrual, number of loans | loan	75	68
Non-accrual, amount | $	$ 20,745	$ 20,907
Troubled debt restructured, number of loans | loan	122	110
Troubled debt restructuring, Amount | $	$ 32,988	$ 30,352
Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	0	2
Accrual, amount | $	$ 0	$ 352
Non-accrual, number of loans | loan	10	7
Non-accrual, amount | $	$ 5,581	$ 5,176
Troubled debt restructured, number of loans | loan	10	9
Troubled debt restructuring, Amount | $	$ 5,581	$ 5,528
Commercial Portfolio Segment | Commercial and Industrial Sector
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	0	0
Accrual, amount | $	$ 0	$ 0
Non-accrual, number of loans | loan	2	2
Non-accrual, amount | $	$ 1,656	$ 1,688
Troubled debt restructured, number of loans | loan	2	2
Troubled debt restructuring, Amount | $	$ 1,656	$ 1,688
Commercial Portfolio Segment | Multifamily | Commercial Real Estate Sector
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	0	0
Accrual, amount | $	$ 0	$ 0
Non-accrual, number of loans | loan	1	1
Non-accrual, amount | $	$ 246	$ 248
Troubled debt restructured, number of loans | loan	1	1
Troubled debt restructuring, Amount | $	$ 246	$ 248
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Sector
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	0	2
Accrual, amount | $	$ 0	$ 352
Non-accrual, number of loans | loan	7	4
Non-accrual, amount | $	$ 3,679	$ 3,240
Troubled debt restructured, number of loans | loan	7	6
Troubled debt restructuring, Amount | $	$ 3,679	$ 3,592
Consumer Portfolio Segment | Residential And Consumer
Financing Receivable, Modifications [Line Items]
Accrual, number of loans | loan	47	40
Accrual, amount | $	$ 12,243	$ 9,093
Non-accrual, number of loans | loan	65	61
Non-accrual, amount | $	$ 15,164	$ 15,731
Troubled debt restructured, number of loans | loan	112	101
Troubled debt restructuring, Amount | $	$ 27,407	$ 24,824

Loans Receivable, Net (Schedu51

Loans Receivable, Net (Schedule Of Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)loan	Mar. 31, 2016USD ($)loan
Commercial Portfolio Segment | Retail Site | Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of Loans | loan	1	2
Pre-modification Recorded Investment | $	$ 166	$ 442
Post- modification Recorded Investment | $	$ 166	$ 442
Number of Loans | loan	1	2
Pre-modification Interest Yield	5.50%	4.12%
Post- modification Interest Yield	5.50%	4.44%
Consumer Portfolio Segment | Residential And Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of Loans | loan	13	7
Pre-modification Recorded Investment | $	$ 2,879	$ 958
Post- modification Recorded Investment | $	$ 2,779	$ 958
Number of Loans | loan	13	7
Pre-modification Interest Yield	4.27%	6.05%
Post- modification Interest Yield	3.54%	3.99%

Deposits (Summary of Deposits)

Deposits (Summary of Deposits) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Non-interest bearing:
Checking accounts	$ 2,234,674	$ 2,173,493
Interest bearing:
Checking accounts	3,954,999	3,916,208
Money market deposits	4,224,490	4,150,583
Savings	2,137,895	2,092,989
Certificates of deposit	2,823,965	2,947,560
Total deposits	$ 15,376,023	$ 15,280,833

Goodwill and Other Intangible53

Goodwill and Other Intangible Assets Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	$ 50,548	$ 50,548
Accumulated Amortization	(26,479)	(26,115)
Valuation Allowance	(165)	(165)
Net Intangible Assets	23,904	24,268
Goodwill	77,571	77,571
Goodwill and intangible assets	101,475	101,839
Mortgage servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	24,340	24,340
Accumulated Amortization	(9,003)	(9,286)
Valuation Allowance	(165)	(165)
Net Intangible Assets	15,172	14,889
Core deposit premiums
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	25,058	25,058
Accumulated Amortization	(17,232)	(16,607)
Valuation Allowance	0	0
Net Intangible Assets	7,826	8,451
Other
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	1,150	1,150
Accumulated Amortization	(244)	(222)
Valuation Allowance	0	0
Net Intangible Assets	$ 906	$ 928

Goodwill and Other Intangible54

Goodwill and Other Intangible Assets Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Loans sold	$ 1,970	$ 1,980
Estimated fair value of servicing asset in intangible assets	$ 15.2	$ 14.9
Weighted average discount rate of servicing assets	14.26%
Weighted average constant prepayment rate on mortgages	8.94%
Weighted average life of servicing assets, years	7 years 2 months 26 days
Core deposit premiums
Finite-Lived Intangible Assets [Line Items]
Useful life, years	10 years

Equity Incentive Plan (Narrativ

Equity Incentive Plan (Narrative) (Details) - USD ($) $ in Millions	Jun. 09, 2015	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)		0
Compensation not yet recognized		$ 25
Compensation cost not yet recognized, period for recognition (years)		4 years 7 months 6 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)		350,000
Compensation not yet recognized, restricted stock		$ 65.8
Compensation cost not yet recognized, period for recognition (years)		4 years 7 months 10 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 (years)	10 years
Minimum | 2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (years)	5 years
Maximum | 2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (years)	7 years

Equity Incentive Plan (Shares-b

Equity Incentive Plan (Shares-based compensation expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock option expense	$ 1,426	$ 1,380
Restricted stock expense	3,431	2,953
Total share based compensation expense	$ 4,857	$ 4,333

Equity Incentive Plan (Summary

Equity Incentive Plan (Summary of Stock Option Activity and Related Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Number of Stock Options
Beginning balance (shares)	13,165,333
Granted (shares)	0
Exercised (shares)	(578,800)
Forfeited (shares)	(34,855)
Expired (shares)	0
Ending balance (shares)	12,551,678	13,165,333
Exercisable at period end(shares)	3,156,608
Weighted Average Exercise Price
Beginning balance (usd per share)	$ 11.74
Granted (usd per share)	0
Exercised (usd per share)	6.33
Forfeited (usd per share)	12.54
Expired (usd per share)	0
Ending balance (usd per share)	11.99	$ 11.74
Exercisable end of the year (usd per share)	$ 10.39
Outstanding, Weighted Average Remaining Contractual Life (years)	8 years 2 months 12 days	8 years 2 months 12 days
Granted, Weighted Average Remaining Contractual Life (years)	0 years
Exercised, Weighted Average Remaining Contractual Life (years)	2 years 3 months 18 days
Weighted Average Remaining Contractual Life, Exercisable Ending Balance (years)	6 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding	$ 30,041	$ 29,101
Aggregate Intrinsic Value, Exercisable	$ 12,590

Equity Incentive Plan (Restrict

Equity Incentive Plan (Restricted Stock) (Details) - Restricted Stock	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Number of Shares Awarded
Beginning balance (shares) | shares	5,876,491
Granted (shares) | shares	350,000
Vested (shares) | shares	(7,289)
Forfeited (shares) | shares	(9,019)
Ending balance (shares) | shares	6,210,183
Weighted Average Exercise Price
Beginning balance (usd per share) | $ / shares	$ 12.51
Granted (usd per share) | $ / shares	14.68
Vested (usd per share) | $ / shares	11.22
Forfeited (usd per share) | $ / shares	11.34
Ending balance (usd per share) | $ / shares	$ 12.63

Net Periodic Benefit Plan Exp59

Net Periodic Benefit Plan Expense (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Maximum annual contributions per employee, Percent	60.00%
Annual benefit, period ( in months)	36 months
Vesting period (in years)	2 years
Percentage of vesting, year 1	50.00%
Percentage of vesting, year 2	100.00%
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 371,000	$ 894,000
Interest cost	378,000	474,000
Prior service cost	0	0
Net loss	115,000	536,000
Total net periodic benefit cost	864,000	$ 1,904,000
Contribution and pension cost	$ 0

Derivatives and Hedging Activ60

Derivatives and Hedging Activities (Narrative) (Details) - Derivatives designated as hedging instruments: $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Interest rate swaps
Derivative [Line Items]
Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense	$ 1.9
Cash Flow Hedging | Interest Rate Contract
Derivative [Line Items]
Notional amount	$ 600

Derivatives and Hedging Activ61

Derivatives and Hedging Activities - Fair Value of Derivative Instruments on the Blaance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Asset Derivatives		$ 12,550
Liability Derivatives	$ 358
Interest rate swaps
Derivatives, Fair Value [Line Items]
Asset Derivatives		12,550
Liability Derivatives	358
Interest rate swaps | Derivatives designated as hedging instruments: | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	12,550
Interest rate swaps | Derivatives designated as hedging instruments: | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 358	$ 0

Derivatives and Hedging Activ62

Derivatives and Hedging Activities - Effective Derivative Instrument (Details) - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	$ 1,256	$ 0
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(807)	0
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	0	0
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	1,256	0
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(807)	0
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	$ 0	$ 0

Derivatives and Hedging Activ63

Derivatives and Hedging Activities - Offsetting Derivatives (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Liabilities:
Gross Amounts Recognized	$ 358
Gross Amounts Offset	0
Net Amounts Presented	358
Financial Instruments	0
Cash Collateral Posted	0
Net Amount	358
Assets:
Gross Amounts Recognized		$ 12,550
Gross Amounts Offset		0
Net Amounts Presented		12,550
Financial Instruments		0
Cash Collateral Posted		12,550
Net Amount		0
Interest rate swaps
Liabilities:
Gross Amounts Recognized	358
Gross Amounts Offset	0
Net Amounts Presented	358
Financial Instruments	0
Cash Collateral Posted	0
Net Amount	$ 358
Assets:
Gross Amounts Recognized		12,550
Gross Amounts Offset		0
Net Amounts Presented		12,550
Financial Instruments		0
Cash Collateral Posted		12,550
Net Amount		$ 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, 2017	Mar. 31, 2016
Equity [Abstract]
Net income, Gross	$ 73,264	$ 71,124
Net income, Tax	(27,244)	(26,455)
Net income	46,020	44,669
Change in funded status of retirement obligations, Gross	141	536
Change in funded status of retirement obligations, Tax	(58)	(219)
Change in funded status of retirement obligations	83	317
Unrealized gain (loss) on securities available-for-sale, Gross	4,291	16,500
Unrealized gain (loss) on securities available-for-sale, Tax	(1,612)	(6,498)
Unrealized gain (loss) on securities available-for-sale	2,679	10,002
Accretion of loss on securities reclassified to held to maturity from available for sale, Gross	352	480
Accretion of loss on securities reclassified to held to maturity from available for sale, Tax	(144)	(196)
Accretion of loss on securities reclassified to held to maturity from available for sale, Net	208	284
Reclassification adjustments for losses included in net income, Gross	(1,227)	(1,388)
Reclassification adjustments for losses included in net income, Tax	491	555
Reclassification adjustment for losses Included in net income	(736)	(833)
Other-than-temporary impairment accretion on debt securities, Gross	673	322
Other-than-temporary impairment accretion on debt securities, Tax	(274)	(131)
Other-than-temporary impairment accretion on debt securities, Net	399	191
Net (losses) on derivatives arising during the period, Gross	2,063	0
Net (losses) on derivatives arising during the period, Tax	(843)	0
Net (losses) on derivatives arising during the period, Net	1,220	0
Total other comprehensive income (loss), Gross	6,293	16,450
Total other comprehensive income (loss), Tax	(2,440)	(6,489)
Total other comprehensive income	3,853	9,961
Total comprehensive income, Gross	79,557	87,574
Total comprehensive income, Tax	(29,684)	(32,944)
Total comprehensive income	$ 49,873	$ 54,630

Comprehensive Income (Compone65

Comprehensive Income (Component of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 3,123,245	$ 3,311,647
Net change	3,853	9,961
Balance	3,158,492	3,215,726
Total accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(24,600)	(27,825)
Net change	3,853	9,961
Balance	(20,747)	(17,864)
Change in funded status of retirement obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(4,895)	(12,366)
Net change	83	317
Balance	(4,812)	(12,049)
Accretion of loss on securities reclassified to held to maturity
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(1,988)	(3,080)
Net change	208	284
Balance	(1,780)	(2,796)
Unrealized gains on securities available-for-sale and gains included in net income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(12,271)	1,371
Net change	1,943	9,169
Balance	(10,328)	10,540
Other-than- temporary impairment accretion on debt securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(12,870)	(13,750)
Net change	399	191
Balance	(12,471)	(13,559)
Unrealized gains on derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	7,424	0
Net change	1,220	0
Balance	$ 8,644	$ 0

Comprehensive Income (Reclassif

Comprehensive Income (Reclassification Adjustment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Compensation and fringe benefits	$ 57,274	$ 51,817
Income tax expense (benefit)	(27,244)	(26,455)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(300)	(852)
Income tax expense (benefit)	133	336
Income before undistributed earnings of subsidiary	(167)	(516)
Unrealized gains on securities available-for-sale and gains included in net income | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on security transactions, net	(1,227)	(1,388)
Change in funded status of retirement obligations | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service cost	0	0
Amortization of net loss	120	536
Compensation and fringe benefits	120	536
Interest Expense | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment for unrealized losses on derivatives	$ 807	$ 0

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, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	$ 1,767,260	$ 1,660,433
Derivative financial instruments	358
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	5,458	6,660
Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	1,761,802	1,653,773
Federal Home Loan Mortgage Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	622,069	598,439
Federal National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	1,094,876	1,008,587
Government National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	44,857	46,747
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	1,767,260	1,660,433
Derivative financial instruments	358	12,550
Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	5,458	6,660
Fair Value, Measurements, Recurring | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	1,761,802	1,653,773
Fair Value, Measurements, Recurring | Federal Home Loan Mortgage Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	622,069	598,439
Fair Value, Measurements, Recurring | Federal National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	1,094,876	1,008,587
Fair Value, Measurements, Recurring | Government National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	44,857	46,747
Level 1 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	5,458	6,660
Derivative financial instruments	0	0
Level 1 | Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	5,458	6,660
Level 1 | Fair Value, Measurements, Recurring | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	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]
Securities available-for-sale	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]
Securities available-for-sale	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]
Securities available-for-sale	0	0
Level 2 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	1,761,802	1,653,773
Derivative financial instruments	358	12,550
Level 2 | Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	0	0
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	1,761,802	1,653,773
Level 2 | Fair Value, Measurements, Recurring | Federal Home Loan Mortgage Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	622,069	598,439
Level 2 | Fair Value, Measurements, Recurring | Federal National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	1,094,876	1,008,587
Level 2 | Fair Value, Measurements, Recurring | Government National Mortgage Association
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	44,857	46,747
Level 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	0	0
Derivative financial instruments	0	0
Level 3 | Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	0	0
Level 3 | Fair Value, Measurements, Recurring | Mortgage-backed securities:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available-for-sale	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]
Securities available-for-sale	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]
Securities available-for-sale	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]
Securities available-for-sale	$ 0	$ 0

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
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 (percentage)	14.26%	14.27%
Mortgage servicing rights | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Prepayment range (percentage)	23.28%	24.18%
Mortgage servicing rights | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Prepayment range (percentage)	3.74%	3.15%
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 (percentage)	25.00%
Loans Receivable | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate (percentage)	0.00%
Other real estate owned | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate (percentage)	25.00%
Other real estate owned | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate (percentage)	0.00%

Fair Value Measurements (Carr69

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, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSR, net	$ 15,200	$ 14,900
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	24	1,403
Other real estate owned	215
MSR, net		12,877
Loans held for sale		313
Total	239	14,593
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other real estate owned	0
MSR, net		0
Loans held for sale		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	0
Other real estate owned	0
MSR, net		0
Loans held for sale		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	24	1,403
Other real estate owned	215
MSR, net		12,877
Loans held for sale		313
Total	$ 239	$ 14,593
Impaired loans | Minimum
Fair Value Inputs [Abstract]
Lack of marketability, range (percentage)	1.00%	22.00%
Impaired loans | Maximum
Fair Value Inputs [Abstract]
Lack of marketability, range (percentage)	45.00%	29.00%
Impaired loans | Weighted Average
Fair Value Inputs [Abstract]
Lack of marketability, range (percentage)	45.00%	26.00%
Other real estate owned | Minimum
Fair Value Inputs [Abstract]
Lack of marketability, range (percentage)	0.00%
Other real estate owned | Maximum
Fair Value Inputs [Abstract]
Lack of marketability, range (percentage)	25.00%
Other real estate owned | Weighted Average
Fair Value Inputs [Abstract]
Lack of marketability, range (percentage)	5.82%
Mortgage servicing rights | Minimum
Fair Value Inputs [Abstract]
Prepayment range (percentage)	3.74%	3.15%
Mortgage servicing rights | Maximum
Fair Value Inputs [Abstract]
Prepayment range (percentage)	23.28%	24.18%
Mortgage servicing rights | Weighted Average
Fair Value Inputs [Abstract]
Prepayment range (percentage)		9.84%
Loans held for sale | Minimum
Fair Value Inputs [Abstract]
Lack of marketability, range (percentage)		2.50%
Loans held for sale | Maximum
Fair Value Inputs [Abstract]
Lack of marketability, range (percentage)		4.50%
Loans held for sale | Weighted Average
Fair Value Inputs [Abstract]
Lack of marketability, range (percentage)		3.45%

Fair Value Measurements (Carr70

Fair Value Measurements (Carrying Amounts and Estimated Fair Values) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	$ 1,767,260	$ 1,660,433
Securities held-to-maturity	1,736,210	1,782,801
Carrying value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	165,914	164,178
Securities available-for-sale	1,767,260	1,660,433
Securities held-to-maturity	1,704,406	1,755,556
Stock in FHLB	251,805	237,878
Loans held for sale	4,908	38,298
Net loans	19,261,271	18,569,855
Deposits, other than time deposits	12,552,058	12,333,273
Time deposits	2,823,965	2,947,560
Borrowed funds	5,093,790	4,546,251
Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	165,914	164,178
Securities available-for-sale	1,767,260	1,660,433
Securities held-to-maturity	1,736,210	1,782,801
Stock in FHLB	251,805	237,878
Loans held for sale	4,908	38,298
Net loans	18,943,156	18,391,018
Deposits, other than time deposits	12,552,058	12,333,273
Time deposits	2,811,589	2,938,137
Borrowed funds	5,093,224	4,545,745
Level 1 | Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	165,914	164,178
Securities available-for-sale	5,458	6,660
Securities held-to-maturity	0	0
Stock in FHLB	251,805	237,878
Loans held for sale	0	0
Net loans	0	0
Deposits, other than time deposits	12,552,058	12,333,273
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	1,761,802	1,653,773
Securities held-to-maturity	1,658,303	1,703,559
Stock in FHLB	0	0
Loans held for sale	4,908	38,298
Net loans	0	0
Deposits, other than time deposits	0	0
Time deposits	2,811,589	2,938,137
Borrowed funds	5,093,224	4,545,745
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	77,907	79,242
Stock in FHLB	0	0
Loans held for sale	0	0
Net loans	18,943,156	18,391,018
Deposits, other than time deposits	0	0
Time deposits	0	0
Borrowed funds	$ 0	$ 0

Subsequent Event (Details)

Subsequent Event (Details) - $ / shares	May 25, 2017	Apr. 27, 2017	Mar. 31, 2017	Mar. 31, 2016
Subsequent Event [Line Items]
Dividends paid per share (usd per share)			$ 0.08	$ 0.06
Subsequent Event
Subsequent Event [Line Items]
Dividends declared per share (usd per share)		$ 0.08
Scenario, Forecast | Subsequent Event
Subsequent Event [Line Items]
Dividends paid per share (usd per share)	$ 0.08