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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 318,118	$ 226,550
Gross Unrealized Gains	2,317	4,734
Gross Unrealized Losses	(3,469)	(1,054)
Fair Value	316,966	230,230
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	29,069	30,450
Gross Unrealized Gains	139	100
Gross Unrealized Losses	(233)	(192)
Fair Value	28,975	30,358
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	153,285	114,002
Gross Unrealized Gains	1,862	4,226
Gross Unrealized Losses	(1,277)	(172)
Fair Value	153,870	118,056
Mortgage-backed Securities in Government Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	135,764	82,098
Gross Unrealized Gains	316	408
Gross Unrealized Losses	(1,959)	(690)
Fair Value	$ 134,121	$ 81,816

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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