Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands		Sep. 30, 2017		Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Certain impaired loans		$ 42,581	[1]	$ 15,635	[2]
Other assets	[3]	1,493		5,684
Total		44,074		21,319
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Certain impaired loans		42,581	[1]	15,635	[2]
Other assets	[3]	1,493		5,684
Total		$ 44,074		$ 21,319

[1] Represents the fair value of impaired loans, based on the value of the collateral.

[2] Represents the fair value of impaired loans, based on the value of the collateral, primarily taxi medallion loans.

[3] Represents the fair value of OREO, based on the appraised value of the collateral subsequent to its initial classification as OREO.