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v3.20.4

Capital - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 31, 2021 | Mar. 04, 2019 | Oct. 24, 2018 | Dec. 31, 2017 | Feb. 17, 2016 | Jan. 28, 2014 | Jan. 29, 2013
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Announcement of common stock repurchase program |  |  |  |  | $ 25,000 | $ 25,000 |  | $ 25,000 | $ 25,000 | $ 25,000
Stock repurchased (in shares) | 2,761,504 | 1,843,373 |  |  |  |  |  |  |  |
Average price per share | $ 9.07 | $ 13.58 |  |  |  |  |  |  |  |
Shareholders' equity | $ 1,068,617 | $ 1,055,665 | $ 975,389 |  |  |  | $ 888,127 |  |  |
Increase (decrease) in equity | 13,000 |  |  |  |  |  |  |  |  |
Net Income | 73,447 | 105,333 | 107,498 |  |  |  |  |  |  |
Proceeds from issuance of treasury stock | 1,800 |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value of available for sale investments | 11,700 |  |  |  |  |  |  |  |  |
Payments of dividends | 42,982 | 39,394 | 34,849 |  |  |  |  |  |  |
Purchase of treasury stock | 20,905 | $ 6,259 | $ 26,189 |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 11,199 |  |  |  |  |  | $ (1,344) |  |  |
Cash Dividends Declared per Common Share (in dollars per share) | $ 0.44 | $ 0.40 | $ 0.35 |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Announcement of common stock repurchase program |  |  |  | $ 25,000 |  |  |  |  |  |

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