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Other Real Estate Owned - Summary of Foreclosed Property Activity (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Real Estate Acquired Through Foreclosure [Line Items]
Beginning Balance	$ 7,735	$ 9,310
Transfers from loans	1,702	4,513
Sales proceeds	(2,369)	(3,327)
Gross gains	4	235
Gross losses	(283)	(227)
Net gains (losses)	(279)	8
Impairment	(133)	(193)
Ending Balance	6,656	10,311
FUSB [Member]
Real Estate Acquired Through Foreclosure [Line Items]
Beginning Balance	6,997	8,463
Transfers from loans	1,439	4,152
Sales proceeds	(2,225)	(3,113)
Gross gains	4	231
Gross losses	(210)	(128)
Net gains (losses)	(206)	103
Impairment	(44)	(146)
Ending Balance	5,961	9,459
ALC [Member]
Real Estate Acquired Through Foreclosure [Line Items]
Beginning Balance	738	847
Transfers from loans	263	361
Sales proceeds	(144)	(214)
Gross gains		4
Gross losses	(73)	(99)
Net gains (losses)	(73)	(95)
Impairment	(89)	(47)
Ending Balance	$ 695	$ 852

X

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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Real estate acquired through foreclosure.

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