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Subsequent Events (Details) - USD ($)
3 Months Ended
Apr. 23, 2021
Mar. 31, 2021
Mar. 31, 2020
Subsequent Event [Line Items]      
Repayments of lines of credit   $ 82,222,000 $ 33,231,000
Revolving Credit Facility | Chase Bank, N.A. | Line of Credit | San Jose Water Company | Subsequent Event      
Subsequent Event [Line Items]      
Repayments of lines of credit $ 140,000,000    
Revolving Credit Facility | Chase Bank, N.A. | Line of Credit | San Jose Water Company | SJWC Credit Agreement | Subsequent Event      
Subsequent Event [Line Items]      
Line of credit facility, maximum borrowing capacity 140,000,000    
Revolving Credit Facility | Chase Bank, N.A. | Line of Credit | SJW Corp. and SJWTX, Inc. | SJWTX Credit Agreement | Subsequent Event      
Subsequent Event [Line Items]      
Repayments of lines of credit 5,000,000    
Line of credit facility, maximum borrowing capacity 5,000,000    
Letter of Credit Sublimit | Chase Bank, N.A. | Line of Credit | San Jose Water Company | SJWC Credit Agreement | Subsequent Event      
Subsequent Event [Line Items]      
Line of credit facility, maximum borrowing capacity 15,000,000    
Letter of Credit Sublimit | Chase Bank, N.A. | Line of Credit | SJW Corp. and SJWTX, Inc. | SJWTX Credit Agreement | Subsequent Event      
Subsequent Event [Line Items]      
Line of credit facility, maximum borrowing capacity $ 1,000,000