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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 189,284 | $ 199,165
Gross Unrealized Gains | 210 | 501
Gross Unrealized Losses | (6,419) | (3,268)
Fair Value | 183,075 | 196,398
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 21,141 | 21,219
Gross Unrealized Losses | (370) | (241)
Fair Value | 20,771 | 20,978
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 78,753 | 82,198
Gross Unrealized Losses | (2,986) | (1,732)
Fair Value | 75,767 | 80,466
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 36,350 | 40,236
Gross Unrealized Gains | 11 | 64
Gross Unrealized Losses | (1,761) | (790)
Fair Value | 34,600 | 39,510
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 53,040 | 55,512
Gross Unrealized Gains | 199 | 437
Gross Unrealized Losses | (1,302) | (505)
Fair Value | $ 51,937 | $ 55,444

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- 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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