Foreclosed Assets - Summary of Activity in Balance of Foreclosed Assets (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Assets	Sep. 30, 2015 USD ($) Assets
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net			$ 5,369	$ 4,894
Additions/transfers from loans			1,953	4,709
Dispositions/sales			(3,157)	(3,971)
Valuation adjustments			(41)	(347)
Ending balance, net	$ 4,124	$ 5,285	4,124	5,285
Ending valuation allowance			$ (241)	$ (519)
Ending number of foreclosed assets | Assets			15	28
Proceeds from sale of foreclosed assets			$ 3,375	$ 4,753
Gain on sale of foreclosed assets	69	356	218	782
Noncovered [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net			5,369	4,449
Additions/transfers from loans			1,730	5,154
Dispositions/sales			(3,157)	(3,971)
Valuation adjustments			(41)	(347)
Ending balance, net	3,901	$ 5,285	3,901	5,285
Ending valuation allowance			$ (241)	$ (519)
Ending number of foreclosed assets | Assets			14	28
Proceeds from sale of foreclosed assets			$ 3,375	$ 4,753
Gain on sale of foreclosed assets			218	782
Covered [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net				445
Additions/transfers from loans			223	$ (445)
Ending balance, net	$ 223		$ 223
Ending number of foreclosed assets | Assets			1