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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 3 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flows From Financing Activities:      
Proceeds from stock option exercises $ 546 $ 909 $ 235
Net change in notes payable to banks (36,500) 31,000 (62,000)
Dividends paid (38,937) (36,417) (33,408)
Other (1,253) (1,292) (1,490)
Net increase (decrease) in cash and cash equivalents 6,927 (222) (3,928)
Cash and cash equivalents, beginning of year 214 436 4,364
Cash and cash equivalents, end of year 7,141 214 436
Parent Company      
Condensed financial statements      
Cash Flows From Operating Activities 79,877 36,024 34,878
Cash Flows From Investing Activities:      
Loans (made to)/repaid from, wholly-owned subsidiaries (30,500) 30,500 (64,500)
Investment Company, Net Assets, Period Increase (Decrease) (47,500) 0 0
Net cash used (78,000) 30,500 (64,500)
Cash Flows From Financing Activities:      
Proceeds from stock option exercises 546 909 235
Net change in notes payable to banks (36,500) 31,000 (62,000)
Dividends paid (38,937) (36,417) (33,408)
Other 0 0 (9)
Net cash provided (used) (1,891) (66,508) 28,818
Net increase (decrease) in cash and cash equivalents (14) 16 (804)
Cash and cash equivalents, beginning of year 48 32 836
Cash and cash equivalents, end of year $ 34 $ 48 $ 32