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Other Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 324,212	$ 189,848	$ 298,898	$ 184,461
Total other comprehensive income (loss)	3,058	(625)	13,119	(3,479)
Ending balance	329,263	289,388	329,263	289,388
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	12,176	(173)	2,347	3,185
Other comprehensive income (loss) before reclassifications	2,944	(1,048)	12,784	(4,123)
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	310	(13)	305
Total other comprehensive income (loss)	2,942	(738)	12,771	(3,818)
Reclassification of equity securities from accumulated other comprehensive loss				(278)
Ending balance	15,118	(911)	15,118	(911)
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,567)	(4,083)	(3,799)	(4,309)
Amounts reclassified from accumulated other comprehensive income (loss)	116	113	348	339
Total other comprehensive income (loss)	116	113	348	339
Ending balance	(3,451)	(3,970)	(3,451)	(3,970)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	8,609	(4,256)	(1,452)	(1,124)
Other comprehensive income (loss) before reclassifications	2,944	(1,048)	12,784	(4,123)
Amounts reclassified from accumulated other comprehensive income (loss)	114	423	335	644
Total other comprehensive income (loss)	3,058	(625)	13,119	(3,479)
Reclassification of equity securities from accumulated other comprehensive loss				(278)
Ending balance	$ 11,667	$ (4,881)	$ 11,667	$ (4,881)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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