Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net income	$ 119,259us-gaap_NetIncomeLoss	$ 115,254us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (recovery of) loan losses	7nyb_ProvisionRecoveriesForLoanLosses	(14,630)nyb_ProvisionRecoveriesForLoanLosses
Depreciation and amortization	7,645	6,765
Amortization of discounts and premiums, net	(1,670)	(2,007)
Amortization of core deposit intangibles	1,584us-gaap_AmortizationOfIntangibleAssets	2,323us-gaap_AmortizationOfIntangibleAssets
Net gain on sales of securities	(211)us-gaap_GainLossOnSaleOfSecuritiesNet	(4,873)us-gaap_GainLossOnSaleOfSecuritiesNet
Gain on sales of loans	(21,461)us-gaap_GainLossOnSaleOfLoansAndLeases	(3,778)us-gaap_GainLossOnSaleOfLoansAndLeases
Gain on Visa shares sold		(3,856)
Stock plan-related compensation	7,165us-gaap_ShareBasedCompensation	6,664us-gaap_ShareBasedCompensation
Deferred tax expense	9,419us-gaap_DeferredIncomeTaxExpenseBenefit	10,587us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in assets and liabilities:
Decrease in other assets	12,625	49,571
Increase in other liabilities	29,606	45,305
Origination of loans held for sale	(1,492,222)	(636,855)
Proceeds from sales of loans originated for sale	1,404,595	617,633
Net cash provided by operating activities	76,341	188,103
Cash Flows from Investing Activities:
Proceeds from repayment of securities held to maturity	139,544	103,577
Proceeds from repayment of securities available for sale	886	3,918
Proceeds from sale of securities available for sale	135,211	136,747
Purchase of securities held to maturity		(138,342)
Purchase of securities available for sale	(135,000)	(99,000)
Proceeds from sale of Visa shares		3,856
Net redemption of Federal Home Loan Bank stock	50,385	16,277
Net increase in loans	(321,684)	(875,092)
Proceeds from sales of loans	559,261
Purchase of premises and equipment, net	(10,682)	(11,682)
Net cash provided by (used in) investing activities	417,921	(859,741)
Cash Flows from Financing Activities:
Net increase in deposits	602,653us-gaap_IncreaseDecreaseInDeposits	1,092,574us-gaap_IncreaseDecreaseInDeposits
Net decrease in short-term borrowed funds	(1,161,000)	(276,100)
Net increase (decrease) in long-term borrowed funds	198,915	(1,522)
Tax effect of stock plans	996	1,496
Cash dividends paid on common stock	(110,851)us-gaap_PaymentsOfDividendsCommonStock	(110,461)us-gaap_PaymentsOfDividendsCommonStock
Treasury stock purchases	(6,567)	(6,029)
Net cash received from stock option exercises		2
Net cash (used in) provided by financing activities	(475,854)	699,960
Net increase in cash and cash equivalents	18,408	28,322
Cash and cash equivalents at beginning of period	564,150	644,550
Cash and cash equivalents at end of period	582,558	672,872
Supplemental information:
Cash paid for interest	139,220us-gaap_InterestPaid	135,424us-gaap_InterestPaid
Cash paid for income taxes	10,698us-gaap_IncomeTaxesPaidNet	17,418us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities:
Transfers to other real estate owned from loans	17,098us-gaap_TransferOfOtherRealEstate	45,917us-gaap_TransferOfOtherRealEstate
Transfer of loans from held for investment to held for sale	553,315
Transfer of loans from held for sale to held for investment	$ 153,578us-gaap_TransferToInvestments

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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Amount of cash inflow (outflow) from long-term debt, including capital lease obligations and mandatory redeemable capital securities.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The net cash inflow from (a) sales of loans held-for-investment, (b) sales of leases held-for-investment, and (c) both. Includes proceeds from securitizations of loans.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Value transferred out of real estate owned (REO) in noncash transactions.

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Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

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Value of investments transferred to the entity's investments in noncash transactions.

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