| 1 | 100000 - Document - Document and Entity Information | (implied) | Document And Entity Information [Abstract] | Set |
| 2 | 100010 - Statement - INCOME STATEMENTS | (implied) | Net income | RollUp |
| 3 | 100010 - Statement - INCOME STATEMENTS | (implied) | Earnings per share: | Set |
| 4 | 100010 - Statement - INCOME STATEMENTS | (implied) | Weighted average shares outstanding: | Set |
| 5 | 100010 - Statement - INCOME STATEMENTS | (implied) | Cash dividends declared per common share | Set |
| 6 | 100020 - Statement - COMPREHENSIVE INCOME STATEMENTS | (implied) | Comprehensive income | RollUp |
| 7 | 100030 - Statement - COMPREHENSIVE INCOME STATEMENTS (Parenthetical) | (implied) | Statement Of Income And Comprehensive Income [Abstract] | Set |
| 8 | 100040 - Statement - BALANCE SHEETS | (implied) | Total assets | RollUp |
| 9 | 100040 - Statement - BALANCE SHEETS | (implied) | Total liabilities and stockholders' equity | RollUp |
| 10 | 100050 - Statement - BALANCE SHEETS (Parenthetical) | (implied) | Balance sheets: | Set |
| 11 | 100060 - Statement - CASH FLOWS STATEMENTS | (implied) | Net change in cash and cash equivalents | RollUp |
| 12 | 100060 - Statement - CASH FLOWS STATEMENTS | (implied) | Cash and cash equivalents, beginning of period | RollForward |
