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Summary of Significant Accounting Policies - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease [Abstract]
Net unrealized gain (loss) on available-for-sale securities	$ (1,058)	$ 267	$ (2,721)
Reclassification adjustment for (gain) loss on sale of available-for-sale securities	9	(47)	(588)
Net unrealized gain (loss) on available-for-sale securities	(1,049)	220	(3,309)
Tax expense (benefit)	(220)	74	(1,125)
Other comprehensive income (loss)	$ (829)	$ 146	$ (2,184)

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