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Investments - Summary of Available-for-Sale Debt Securities and Equity Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales and maturities (fair value) $ 60,545 $ 68,875 $ 111,730 $ 193,702
Proceeds from sales of equity securities 11,976 3,082 29,137 4,127
Gross realized gains on sale of securities 112 10 299 317
Equity securities, FV-NI, Realized Gain 170 177 335 301
Gross realized losses on sale of securities (148) (42) (190) (3,114)
Equity securities, FV-NI, Realized Loss (2,952) 0 (14,787) 0
Realized gains on sale of real estate investment $ 1,213 $ 0 $ 1,213 $ 0