Commitments and Credit Risk - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016
Minimum [Member]
Commitments And Contingencies [Line Items]
Fixed interest rate loan commitments	3.01%
Fixed interest rate loan commitments maturity period	1 month
Maximum [Member]
Commitments And Contingencies [Line Items]
Fixed interest rate loan commitments	12.00%
Fixed interest rate loan commitments maturity period	133 months