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Securities - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Securities	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) Securities
Investments, Debt and Equity Securities [Abstract]
Number of securities holdings | Securities	0		0
Shareholders' equity percentage	10.00%		10.00%
Securities	$ 316,736		$ 329,379
Tax provision related to net realized gains	$ 484	$ 0

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- Definition

Number of securities holdings.

+ References

No definition available.

+ Details

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X

- Definition

Shareholders equity percentage.

+ References

No definition available.

+ Details

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X

- Definition

Tax provision related to net realized gains.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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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=66008989&loc=d3e5086-111524

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