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Other Comprehensive Income - Components of Other Comprehensive Income and Related Tax Effects (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive (loss) income | $ (3,653) | $ 15 | $ (2,020)
Available for sale securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | (5,073) | (136) | (1,838)
Reclassifications | 0 | (160) | (83)
Net unrealized gain (loss) | (5,073) | (296) | (1,921)
Tax effect | 1,066 | 104 | 672
Total other comprehensive (loss) income | (4,007) | (192) | (1,249)
Available for sale securities, portion of OTTI recognized in earnings |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | 0 | 134 | (442)
Reclassifications | 0 | (1,383) | (922)
Net unrealized gain (loss) | 0 | (1,249) | (1,364)
Tax effect | 0 | 437 | 477
Total other comprehensive (loss) income | 0 | (812) | (887)
Unrealized gain (loss) on postretirement benefits plan |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | 404 | 808 | (282)
Reclassifications | 84 | 192 | 184
Net unrealized gain (loss) | 488 | 1,000 | (98)
Tax effect | (102) | (175) | 34
Total other comprehensive (loss) income | 386 | 825 | (64)
Unrealized loss on interest rate swap |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | (204) | 10 | (63)
Reclassifications | 164 | 288 | 340
Net unrealized gain (loss) | (40) | 298 | 277
Tax effect | 8 | (104) | (97)
Total other comprehensive (loss) income | $ (32) | $ 194 | $ 180

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