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Securities - Gross Realized Gains and Losses (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Available For Sale Securities Gross Realized Gain Loss [Abstract]
Gross realized gains	$ 27	$ 58
Gross realized losses	(11)	(11)
Net realized gains	16	47
Tax expense related to net realized gains	$ 5	$ 16

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- Definition

Available for sale securities gross realized gain loss tax expenses.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

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