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Investment Securities - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) Securities	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Securities	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Securities
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity securities in continuous unrealized loss position, less than 12 Months	$ 0		$ 0		$ 129,000
Held-to-maturity securities in continuous unrealized loss position, 12 Months or Longer	$ 0		$ 0		$ 0
Number of securities in an unrealized loss position | Securities	20		20		107
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio	0.98%		0.98%		2.44%
Carrying amount of available-for-sale securities pledged	$ 151,820,000		$ 151,820,000		$ 236,730,000
OTTI charges incurred	4,635,000		4,646,000
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
OTTI charges incurred	4,640,000	$ 0	4,640,000	$ 0
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
OTTI charges incurred	$ 0	$ 0	$ 11,000	$ 0

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Number of securities in an unrealized loss position.

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Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio.

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- Definition

The fair value of available-for-sale 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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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563

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