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Borrowed Funds - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 04, 2002 USD ($) shares $ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) Investment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Prepaid wholesale borrowings |  | $ 10,400,000,000 |  |  |
Accrued interest |  | 12,400,000 | $ 18,100,000 | $ 12,400,000 |
Short-term FHLB advances |  | $ 2,500,000,000 | $ 300,000,000 | $ 2,500,000,000 |
Short-term FHLB advances weighted average interest rate |  | 0.55% | 0.81% | 0.55% |
Short-term FHLB advances, average balance |  |  | $ 929,400,000 | $ 2,300,000,000 | $ 2,600,000,000
Short-term FHLB advances, average balance, weighted average interest rate |  |  | 0.60% | 0.42% | 0.37%
Short-term FHLB advances, interest expense |  |  | $ 5,500,000 | $ 9,800,000 | $ 9,800,000
Interest expense |  |  | 216,464,000 | 1,123,360,000 | 392,968,000
Short-term repurchase agreements |  | $ 1,500,000,000 | 1,500,000,000 | 1,500,000,000 |
Interest expense |  |  | 387,487,000 | 1,283,509,000 | 542,714,000
Federal funds purchased |  | 426,000,000 | $ 150,000,000 | $ 426,000,000 |
Federal fund purchased Weighted average interest rate |  |  | 0.75% | 0.48% |
Federal funds purchased, average balance |  |  | $ 525,400,000 | $ 588,800,000 | $ 430,100,000
Federal fund purchased Weighted average interest rate |  |  | 0.51% | 0.26% | 0.25%
Federal fund purchased, interest expenses |  |  | $ 2,700,000 | $ 1,500,000 | $ 1,100,000
Junior subordinated debentures |  | 358,605,000 | 358,879,000 | 358,605,000 |
Capital security, call option (in years) | 5 years |  |  |  |
Gross proceeds of BONUSES, debt |  |  | $ 1,181,000,000 | 11,243,500,000 | 50,000,000
Dividends on the Capital Securities, deferred period in Years |  |  | 5 years |  |
Percentage of capital securities qualified as Tier II |  |  | 100.00% |  |
Repurchase Agreements |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Accrued interest |  | 1,200,000 | $ 1,200,000 | 1,200,000 |
Interest expense |  |  | 23,300,000 | 99,900,000 | 119,300,000
Short-term repurchase agreements |  | $ 0 | 0 | $ 0 | 0
Short-term debt, weighted average interest rate |  | 0.31% |  | 0.31% |
Short-term debt, average outstanding amount |  |  |  | $ 197,300,000 |
Interest expense |  |  |  | 614,000 |
Federal Home Loan Bank Advances |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense |  |  | 172,000,000 | 230,600,000 | 255,000,000
Junior Subordinated Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense |  |  | $ 18,500,000 | $ 17,600,000 | 17,500,000
Number of business trusts owned | Investment |  |  | 3 |  |
Primarily Callable Wholesale Borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Average cost of borrowings |  | 3.16% |  | 3.16% |
Wholesale Borrowings With Fixed Maturities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Average cost of borrowings |  | 1.58% |  | 1.58% |
New York Community Capital Trust V (BONUSESSM Units) | BONUSESSM units |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Public offering of Bifurcated Option Note Unit Securities ("BONUSES units") | shares | 5,500,000 |  |  |  |
Public offering of units, offering price per share | $ / shares | $ 50.00 |  |  |  |
Gross proceeds of BONUSES, debt | $ 275,000,000 |  |  |  |
Difference between the assigned value and the stated liquidation amount of the capital securities is treated as an original issue discount | 92,400,000 |  |  |  |
Original issue discount amortized amount |  |  | $ 66,700,000 |  |
New York Community Capital Trust V (BONUSESSM Units) | BONUSESSM units | Warrant |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Gross proceeds of BONUSES | $ 92,400,000 |  |  |  |
New York Community Capital Trust V (BONUSESSM Units) | BONUSESSM units | Capital Units |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Warrant to purchase, number of shares | shares | 2.4953 |  |  |  |
Warrant to purchase, total number of shares | shares | 13,700,000 |  |  |  |
Warrant to purchase, exercise price per share | $ / shares | $ 20.04 |  |  |  |
Capital security, term (in years) | 49 years |  |  |  |
Capital security, coupon or distribution rate | 6.00% |  |  |  |
Capital security, per share liquidation amount | $ / shares | $ 50.00 |  |  |  |
Gross proceeds of BONUSES | $ 182,600,000 |  |  |  |
FHLB - NY |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused line of credit |  | $ 5,700,000,000 | 7,500,000,000 | $ 5,700,000,000 |
Borrowings under line of credit |  | $ 790,300,000 | $ 10,000,000 | $ 790,300,000 |
Line of credit, weighted-average interest rate |  | 0.52% | 0.78% | 0.52% |
Line of credit, average balance |  |  | $ 426,500,000 | $ 572,700,000 | $ 245,300,000
Line of credit, weighted average interest rate |  |  | 0.59% | 0.44% | 0.37%
Interest expense |  |  | $ 2,500,000 | $ 2,500,000 | $ 895,000

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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