Other Assets Acquired through Foreclosure - Changes in Other Assets Acquired through Foreclosure (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Property	Mar. 31, 2015 USD ($) Property	Dec. 31, 2015 Property
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Gains Losses On Transfers To Other Real Estate And Foreclosed Assets	$ 0	$ 600
Number of Real Estate Properties | Property	37	68	39
Balance, beginning of the period, Gross Balance	$ 52,984	$ 71,421
Transfers to other assets acquired through foreclosure, net, Gross Balance	10,638	7,720
Proceeds from sale of other real estate owned and repossessed assets, net, Gross Balance	2,436	2,288
Gains (losses), net, Gross Balance	160	1,115
Balance, end of period, Gross Balance	61,346	77,968
Balance, beginning of the period, Valuation Allowance	9,042	14,271
Proceeds from sale of other real estate owned and repossessed assets, net, Valuation Allowance	295	848
Valuation adjustments, net, Valuation Allowance	(177)	786
Balance, end of period, Valuation Allowance	8,570	14,209
Balance, beginning of the period, Net Balance	43,942	57,150
Transfers to other assets acquired through foreclosure, net, Net Balance	10,638	7,720
Proceeds from sale of other real estate owned and repossessed assets, net, Net Balance	2,141	1,440
Valuation adjustments of other repossessed assets, net	177	(786)
Gains (losses), net, Net Balance	160	1,115
Balance, end of period, Net Balance	$ 52,776	$ 63,759