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Borrowed Funds - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Nov. 04, 2002 USD ($) shares $ / shares | Dec. 31, 2017 USD ($) Investment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Accrued interest |  | $ 19,300,000 | $ 18,100,000 |
Short-term FHLB advances |  | 0 | $ 300,000,000,000 |
Short-term FHLB advances weighted average interest rate |  |  | 0.81% |
Short-term FHLB advances, average balance |  | $ 3,300,000 | $ 929,400,000,000 | $ 2,300,000,000
Short-term FHLB advances, average balance, weighted average interest rate |  | 0.82% | 0.60% | 0.42%
Short-term FHLB advances, interest expense |  | $ 27,000 | $ 5,500,000 | $ 9,800,000
Interest expense |  | 222,454,000 | 216,464,000 | 1,123,360,000
Short-term repurchase agreements |  | 450,000,000 | 1,500,000,000 |
Interest expense |  | 452,236,000 | 387,487,000 | 1,283,509,000
Federal funds purchased |  | 0 | $ 150,000,000 |
Federal fund purchased Weighted average interest rate |  |  | 0.75% |
Federal funds purchased, average balance |  | $ 47,900,000 | $ 525,400,000 | $ 588,800,000
Federal fund purchased Weighted average interest rate |  | 0.87% | 0.51% | 0.26%
Federal fund purchased, interest expenses |  | $ 418,000 | $ 2,700,000 | $ 1,500,000
Junior subordinated debentures |  | $ 359,179,000 | 358,879,000 |
Capital security, call option (in years) | 5 years |  |  |
Dividends on the Capital Securities, deferred period in Years |  | 5 years |  |
Repurchase Agreements |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Accrued interest |  | $ 760,000 | 1,200,000 |
Interest expense |  | 16,400,000 | 23,300,000 | $ 99,900,000
Short-term repurchase agreements |  | 0 | 0 |
Short-term debt, weighted average interest rate |  |  |  | 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 |  | 186,000,000 | 172,000,000 | 230,600,000
Junior Subordinated Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense |  | $ 19,600,000 | 18,500,000 | 17,600,000
Number of business trusts owned | Investment |  | 3 |  |
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 |  | $ 66,400,000 |  |
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 |  | 7,100,000,000 | 7,500,000,000 |
Borrowings under line of credit |  | $ 0 | $ 10,000,000 |
Line of credit, weighted-average interest rate |  |  | 0.78% |
Line of credit, average balance |  |  | $ 426,500,000 | $ 572,700,000
Line of credit, weighted average interest rate |  |  | 0.59% | 0.44%
Interest expense |  |  | $ 2,500,000 | $ 2,500,000

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