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Other Comprehensive Income - Components of Other Comprehensive Income and Related Tax Effects (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss) | $ 10,935 | $ (3,653) | $ 15
Available for sale securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | 13,732 | (5,073) | (136)
Reclassifications | (148) | 0 | (160)
Net unrealized gain (loss) | 13,584 | (5,073) | (296)
Tax effect | (2,852) | 1,066 | 104
Total other comprehensive income (loss) | 10,732 | (4,007) | (192)
Available for sale securities, portion of OTTI recognized in earnings |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | 0 | 0 | 134
Reclassifications | 0 | 0 | (1,383)
Net unrealized gain (loss) | 0 | 0 | (1,249)
Tax effect | 0 | 0 | 437
Total other comprehensive income (loss) | 0 | 0 | (812)
Unrealized gain (loss) on postretirement benefits plan |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | 518 | 404 | 808
Reclassifications | 23 | 84 | 192
Net unrealized gain (loss) | 541 | 488 | 1,000
Tax effect | (113) | (102) | (175)
Total other comprehensive income (loss) | 428 | 386 | 825
Unrealized loss on interest rate swap |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | (347) | (204) | 10
Reclassifications | 63 | 164 | 288
Net unrealized gain (loss) | (284) | (40) | 298
Tax effect | 59 | 8 | (104)
Total other comprehensive income (loss) | $ (225) | $ (32) | $ 194

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