Indemnification Asset/Liability - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Fdic Agreements And Fdic Indemnification Asset [Line Items]
Present value of indemnification liability	$ 633	$ 584
FDIC indemnification agreement expiry month and year	2020-05
Term of FDIC indemnification agreement	10 years
True up amount payable to FDIC, description	The agreement specifies that at the end of the agreement in May 2020, to the extent that total claimed losses plus servicing expenses, net of recoveries, claimed under the agreement over the entire ten year period of the agreement do not meet a certain threshold, the Company will be required to pay to the FDIC a “true up” amount equal to fifty percent of the difference of the threshold and actual claimed losses plus servicing expenses, net of recoveries. The Company has continually been estimating, updating and recording this “true up” amount, at its estimated present value, since the inception of the agreement in May 2010.
Percentage of true up amount payable to FDIC	50.00%
Residential Real Estate Loans [Member]
Fdic Agreements And Fdic Indemnification Asset [Line Items]
FDIC indemnification agreement expiry month and year	2018-05
Nonresidential Real Estate Loans [Member]
Fdic Agreements And Fdic Indemnification Asset [Line Items]
FDIC indemnification agreement expiry month and year	2010-05