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Parent Corporation Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Activities                      
Net income $ 81,859 $ 56,150 $ 72,266 $ 61,348 $ 45,760 $ 55,435 $ 58,819 $ 18,925 $ 271,623 $ 178,939 $ 168,826
Adjustments to reconcile net income to net cash provided by operating activities:                      
Stock-based compensation expense                 19,077 14,507 12,089
Net realized (gains) losses                 (23,071) 25,554 (6,359)
Amortization - other                 55,205 44,874 52,100
Changes in assets and liabilities:                      
Decrease in net federal income taxes                 7,721 2,428 30,918
Increase in other assets                 (39,337) (372) (2,643)
Increase in other liabilities                 34,998 (13,343) 27,297
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (1,856,125) (2,918,203) (2,130,362)
Redemption and maturities of fixed income securities, available-for-sale                 626,686 638,916 555,216
Sale of fixed income securities, available-for-sale                 594,743 2,030,664 1,197,920
Purchase of equity securities                 (46,397) (94,344) (61,931)
Sale of equity securities                 137,294 113,339 37,960
Purchase of short-term investments                 (6,087,909) (4,259,734) (4,280,553)
Sale of short-term investments                 6,129,885 4,101,530 4,338,318
Financing Activities                      
Dividends to stockholders                 (47,675) (42,097) (37,045)
Acquisition of treasury stock                 (8,164) (6,556) (6,015)
Net proceeds from stock purchase and compensation plans                 8,243 7,252 7,599
Cash, beginning of year       505         505    
Cash, end of year 300       505       300 505  
Parent Company [Member]                      
Operating Activities                      
Net income                 271,623 178,939 168,826
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed income of subsidiaries, net of tax                 (205,963) (116,087) (131,797)
Stock-based compensation expense                 19,077 14,507 12,089
Net realized (gains) losses                 (207) 1,567 15
Amortization - other                 4,614 567 678
Changes in assets and liabilities:                      
(Decrease) increase in accrued long-term stock compensation                 (12,970) (15,443) 4,988
Decrease in net federal income taxes                 1,651 11,246 3,811
Increase in other assets                 (533) (343) (60)
Increase in other liabilities                 3,919 1,712 714
Net cash provided by operating activities                 81,211 76,665 59,264
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (153,482) (75,046) (58,832)
Redemption and maturities of fixed income securities, available-for-sale                 10,579 6,849 10,465
Sale of fixed income securities, available-for-sale                 20,189 45,099 31,819
Purchase of equity securities                 (10,824) 0 0
Sale of equity securities                 10,828 0 0
Purchase of short-term investments                 (1,116,766) (207,115) (185,590)
Sale of short-term investments                 1,116,253 195,846 179,292
Net cash used in investing activities                 (123,223) (34,367) (22,846)
Financing Activities                      
Dividends to stockholders                 (47,675) (42,097) (37,045)
Acquisition of treasury stock                 (8,164) (6,556) (6,015)
Proceeds from issuance of notes payable, net of debt issuance costs                 290,757 0 0
Principal payment on notes payable                 (185,000) 0 0
Net proceeds from stock purchase and compensation plans                 8,243 7,252 7,599
Principal payments of borrowings from subsidiaries                 (16,354) (926) (881)
Net cash provided by (used in) financing activities                 41,807 (42,327) (36,342)
Net (decrease) increase in cash                 (205) (29) 76
Cash, beginning of year       $ 505       $ 534 505 534 458
Cash, end of year $ 300       $ 505       $ 300 $ 505 $ 534