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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 3 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed financial statements      
Cash Flows From Operating Activities $ 115,584 $ 122,170 $ 116,864
Cash Flows From Investing Activities:      
Net Cash Provided by (Used in) Investing Activities (145,092) (131,610) (153,195)
Cash Flows From Financing Activities:      
Proceeds from stock option exercises   30 519
Dividends paid (51,689) (47,206) (42,702)
Net cash provided (used) in financing activities (2,266) 44,843 30,524
Change in cash and equivalents (31,774) 35,403 (5,807)
Cash and cash equivalents, beginning of period 36,737    
Cash and cash equivalents, end of year 4,963 36,737  
Parent Company      
Condensed financial statements      
Cash Flows From Operating Activities 36,799 47,307 40,459
Cash Flows From Investing Activities:      
Loans (made to)/repaid from, wholly-owned subsidiaries (46,000) 151,000 (107,500)
Increase in investment of subsidiary 0 (60,000) 0
Net Cash Provided by (Used in) Investing Activities (46,000) 91,000 (107,500)
Cash Flows From Financing Activities:      
Proceeds from stock option exercises 0 30 519
Net change in notes payable to banks 60,500 (91,000) 109,500
Proceeds from note payable to GSWC (26,000) (6,000) 0
Repayment of note payable to GSWC 26,000 6,000 0
Dividends paid (51,689) (47,206) (42,702)
Net cash provided (used) in financing activities 8,811 (138,176) 67,317
Change in cash and equivalents (390) 131 276
Cash and cash equivalents, beginning of period 441 310 34
Cash and cash equivalents, end of year $ 51 $ 441 $ 310