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Securities - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) Securities	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Securities	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) Securities
Investments, Debt and Equity Securities [Abstract]
Number of securities holdings | Securities	0		0		0
Shareholders' equity percentage	10.00%		10.00%		10.00%
Securities	$ 302,593		$ 302,593		$ 329,379
Tax provision related to net realized gains	$ 54	$ 352	$ 538	$ 352

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- Definition

Number of securities holdings.

+ References

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- Definition

Shareholders equity percentage.

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- Definition

Tax provision related to net realized gains.

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- References

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- Definition

The fair value of trading securities that serve as collateral for borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524

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