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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