Foreclosed Assets - Summary of Activity in Balance of Foreclosed Assets (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Assets	Jun. 30, 2015 USD ($) Assets
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net			$ 5,369	$ 4,894
Additions/transfers from loans and covered			853	2,160
Dispositions/sales			(2,348)	(1,420)
Valuation adjustments			(32)	(241)
Ending balance, net	$ 3,842	$ 5,393	3,842	5,393
Ending valuation allowance			$ (287)	$ (438)
Ending number of foreclosed assets | Assets			15	33
Proceeds from sale of foreclosed assets			$ 2,497	$ 1,033
Gain on sale of foreclosed assets	57	115	149	426
Noncovered [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net			5,369	4,449
Additions/transfers from loans and covered			853	2,605
Dispositions/sales			(2,348)	(1,420)
Valuation adjustments			(32)	(241)
Ending balance, net	$ 3,842	$ 5,393	3,842	5,393
Ending valuation allowance			$ (287)	$ (438)
Ending number of foreclosed assets | Assets			15	33
Proceeds from sale of foreclosed assets			$ 2,497	$ 1,033
Gain on sale of foreclosed assets			$ 149	426
Covered [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net				445
Additions/transfers from loans and covered				$ (445)