Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Detail) - Residential First Mortgages $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	[1]	1	1
Pre-Modification Outstanding Recorded Investment	[1]	$ 244	$ 244
Post-Modification Outstanding Recorded Investment	[1]	$ 244	$ 244

[1] Modification was a capitalization of interest.