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Comprehensive Income and Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on available-for-sale securities | $ (65) | $ (329) | $ (1,111) | $ (31) | $ 114 | $ (192) | $ (388) | $ (181) | $ (1,536) | $ (647) | $ (494)
Income before income taxes | 22,777 | 24,460 | 20,930 | 19,414 | 17,800 | 23,556 | 22,151 | 18,733 | 87,581 | 82,240 | 112,821
Income tax expense |  |  |  |  |  |  |  |  | (15,949) | (36,009) | (34,956)
Net income | $ 18,806 | $ 19,701 | $ 16,956 | $ 16,169 | $ 649 | $ 16,577 | $ 15,481 | $ 13,524 | 71,632 | 46,231 | 77,865
Unrealized Gains (losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on available-for-sale securities |  |  |  |  |  |  |  |  | (390) | 1,106 | (234)
Income before income taxes |  |  |  |  |  |  |  |  | (390) | 1,106 | (234)
Income tax expense |  |  |  |  |  |  |  |  | 82 | (387) | 82
Net income |  |  |  |  |  |  |  |  | $ (308) | $ 719 | $ (152)

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