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Fair Value Measurements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Estimated selling costs percentage of loans measured for impairment	15.00%

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- Definition

Estimated selling costs percentage of loans measured for impairment.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration