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Other Real Estate Owned - Summary of Foreclosed Property Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Real Estate Acquired Through Foreclosure [Line Items]
Beginning balance	$ 7,735	$ 9,310
Transfers from loans	2,373	4,897
Sales proceeds	(3,538)	(5,870)
Gross gains	4	391
Gross losses	(344)	(671)
Net gains (losses)	(340)	(280)
Impairment	(192)	(322)
Ending balance	6,038	7,735
FUSB [Member]
Real Estate Acquired Through Foreclosure [Line Items]
Beginning balance	6,997	8,463
Transfers from loans	2,013	4,503
Sales proceeds	(3,374)	(5,582)
Gross gains	4	387
Gross losses	(269)	(512)
Net gains (losses)	(265)	(125)
Impairment	(44)	(262)
Ending balance	5,327	6,997
ALC [Member]
Real Estate Acquired Through Foreclosure [Line Items]
Beginning balance	738	847
Transfers from loans	360	394
Sales proceeds	(164)	(288)
Gross gains		4
Gross losses	(75)	(159)
Net gains (losses)	(75)	(155)
Impairment	(148)	(60)
Ending balance	$ 711	$ 738

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230

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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Definition

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

+ References

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-Publisher FASB
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-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5162-111524

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
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-Number 210
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- Definition

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

+ References

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Other real estate gross gains.

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Other real estate gross losses.

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Other real estate net income loss.

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Real estate acquired through foreclosure.

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