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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 312,057	$ 188,043	$ 298,898	$ 184,461
Total other comprehensive income (loss)	5,092	(428)	10,061	(2,854)
Ending balance	324,212	189,848	324,212	189,848
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	7,200	368	2,347	3,185
Other comprehensive income (loss) before reclassifications	4,984	(536)	9,840	(3,075)
Amounts reclassified from accumulated other comprehensive loss	(8)	(5)	(11)	(5)
Total other comprehensive income (loss)	4,976	(541)	9,829	(3,080)
Reclassification of equity securities from accumulated other comprehensive loss				(278)
Ending balance	12,176	(173)	12,176	(173)
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,683)	(4,196)	(3,799)	(4,309)
Amounts reclassified from accumulated other comprehensive loss	116	113	232	226
Total other comprehensive income (loss)	116	113	232	226
Ending balance	(3,567)	(4,083)	(3,567)	(4,083)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	3,517	(3,828)	(1,452)	(1,124)
Other comprehensive income (loss) before reclassifications	4,984	(536)	9,840	(3,075)
Amounts reclassified from accumulated other comprehensive loss	108	108	221	221
Total other comprehensive income (loss)	5,092	(428)	10,061	(2,854)
Reclassification of equity securities from accumulated other comprehensive loss				(278)
Ending balance	$ 8,609	$ (4,256)	$ 8,609	$ (4,256)

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

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