Consolidated Financial Statements - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) Dwellings Segment
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of loan concentration by bank to lessors and owners of Residential Buildings and Dwellings | Dwellings	2
Loan concentration percentage of total loans	Greater than 10% of total loans
Non Residential Buildings and Dwellings [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Amount payable to lessors	$ 239,878
Amount payable to lessors in percentage	22.90%
Residential Buildings and Dwellings [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Amount payable to lessors	$ 136,094
Amount payable to lessors in percentage	13.00%
Maximum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Percentage of insurance commission revenue of total revenue	1.00%
WSP [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of reportable segment | Segment	1
WSP [Member] | Maximum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Percentage of insurance commission revenue of total revenue	1.00%