Financial Instruments with Off-Balance Sheet Risk and Derivatives (Company's Interest Rate Swaps) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Swap
Derivative [Line Items]
Notional Amount	$ 19,884	$ 20,850
Estimated Fair Value	$ 0	$ 0
Years to Maturity	7 years 4 months 24 days	8 years 6 months
Derivative Receive Rate	4.74%	3.92%
Derivative Pay Rate	4.74%	3.92%
Pay Fixed/Receive Variable Swaps
Derivative [Line Items]
Notional Amount	$ 9,942	$ 10,425
Estimated Fair Value	$ (1,312)	$ (1,501)
Years to Maturity	7 years 4 months 24 days	8 years 6 months
Derivative Receive Rate	4.15%	2.53%
Derivative Pay Rate	5.34%	5.31%
Pay Variable/Receive Fixed Swaps
Derivative [Line Items]
Notional Amount	$ 9,942	$ 10,425
Estimated Fair Value	$ 1,312	$ 1,501
Years to Maturity	7 years 4 months 24 days	8 years 6 months
Derivative Receive Rate	5.34%	5.31%
Derivative Pay Rate	4.15%	2.53%