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Schedule II. Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating activities      
Net cash provided by operating activities $ 28,194 $ 37,979 $ 63,398
Investing activities      
Purchases of property and equipment (2,089) (1,296) (921)
Net cash provided by investing activities 75,426 70,959 43,371
Financing activities      
Finance lease purchases (58) (44) (50)
Purchase of treasury stock (12,388)    
Dividends to shareholders (100,427) (99,929) (88,775)
Net cash used in financing activities (112,873) (99,973) (88,825)
Change in cash and cash equivalents (9,253) 8,965 17,944
Cash and cash equivalents at beginning of year 70,722 61,757 43,813
Cash and cash equivalents at end of year 61,469 70,722 61,757
Parent Company [Member]      
Operating activities      
Net cash provided by operating activities 6,121 6,622 6,012
Investing activities      
Purchases of investments (31,909) (87,289) (10,982)
Proceeds from sales of investments 75,950 28,780 18,970
Purchases of property and equipment (1,903) (1,277) (764)
Dividends from subsidiary 77,700 148,400 88,600
Net cash provided by investing activities 119,838 88,614 95,824
Financing activities      
Finance lease purchases (58) (44) (50)
Purchase of treasury stock (12,388)    
Dividends to shareholders (100,427) (99,929) (88,775)
Net cash used in financing activities (112,873) (99,973) (88,825)
Change in cash and cash equivalents 13,086 (4,737) 13,011
Cash and cash equivalents at beginning of year 18,825 23,562 10,551
Cash and cash equivalents at end of year $ 31,911 $ 18,825 $ 23,562