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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 188,604 | $ 172,263
Gross Unrealized Gains | 2,101 | 295
Gross Unrealized Losses | (240) | (4,111)
Fair Value | 190,465 | 168,447
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 14,029 | 23,078
Gross Unrealized Gains | 10 | 6
Gross Unrealized Losses | (30) | (254)
Fair Value | 14,009 | 22,830
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 79,130 | 71,235
Gross Unrealized Gains | 948 | 2
Gross Unrealized Losses | (35) | (1,910)
Fair Value | 80,043 | 69,327
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 57,180 | 37,342
Gross Unrealized Gains | 446 | 62
Gross Unrealized Losses | (165) | (1,142)
Fair Value | 57,461 | 36,262
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 38,265 | 40,608
Gross Unrealized Gains | 697 | 225
Gross Unrealized Losses | (10) | (805)
Fair Value | $ 38,952 | $ 40,028

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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=118939692&loc=d3e27161-111563 + Details
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