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Parent Corporation Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities                      
Net income $ 45,760 [1] $ 55,435 $ 58,819 $ 18,925 $ 30,242 [1] $ 46,718 $ 41,426 $ 50,440 $ 178,939 $ 168,826 $ 158,495
Adjustments to reconcile net income to net cash provided by operating activities:                      
Stock-based compensation expense                 14,507 12,089 10,449
Net realized losses                 25,554 (6,359) 4,937
Amortization - other                 44,874 52,100 61,671
Changes in assets and liabilities:                      
Decrease (increase) in net federal income taxes                 2,428 30,918 11,150
Increase in other assets                 372 2,643 4,979
Increase in other liabilities                 (13,343) 27,297 9,191
Net cash provided by operating activities                 454,944 379,545 329,509
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (2,918,203) (2,130,362) (1,982,023)
Redemption and maturities of fixed income securities, available-for-sale                 638,916 555,216 641,524
Sale of fixed income securities, available for sale                 12,106 58,832 102,868
Purchase of short-term investments                 (4,259,734) (4,280,553) (3,499,380)
Sale of short-term investments                 4,101,530 4,338,318 3,470,022
Net cash used in investing activities                 (435,688) (332,658) (320,736)
Financing Activities                      
Dividends to stockholders                 (42,097) (37,045) (33,758)
Acquisition of treasury stock                 (6,556) (6,015) (4,992)
Net proceeds from stock purchase and compensation plans                 7,252 7,599 7,811
Excess tax benefits from share-based payment arrangements                 0 0 1,819
Net cash used in financing activities                 (47,047) (39,582) 15,878
Cash, beginning of year       534         534    
Cash, end of year 505       534       505 534  
Parent Company [Member]                      
Operating Activities                      
Net income                 178,939 168,826 158,495
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed income of subsidiaries, net of tax                 (116,087) (131,797) (135,425)
Stock-based compensation expense                 14,507 12,089 10,449
Net realized losses                 1,567 15 220
Amortization - other                 567 678 648
Changes in assets and liabilities:                      
(Decrease) increase in accrued long-term stock compensation                 (15,443) 4,988 5,564
Decrease (increase) in net federal income taxes                 11,246 3,811 (3,612)
Increase in other assets                 (343) (60) (202)
Increase in other liabilities                 1,712 714 80
Net cash provided by operating activities                 76,665 59,264 36,217
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (75,046) (58,832) (45,789)
Redemption and maturities of fixed income securities, available-for-sale                 6,849 10,465 14,983
Sale of fixed income securities, available for sale                 45,099 31,819 18,768
Purchase of short-term investments                 (207,115) (185,590) (119,501)
Sale of short-term investments                 195,846 179,292 130,841
Net cash used in investing activities                 (34,367) (22,846) (698)
Financing Activities                      
Dividends to stockholders                 (42,097) (37,045) (33,758)
Acquisition of treasury stock                 (6,556) (6,015) (4,992)
Net proceeds from stock purchase and compensation plans                 7,252 7,599 7,811
Excess tax benefits from share-based payment arrangements                 0 0 1,819
Principal payments of borrowings from subsidiaries                 (926) (881) (6,839)
Net cash used in financing activities                 (42,327) (36,342) (35,959)
Net (decrease) increase in cash                 (29) 76 (440)
Cash, beginning of year       $ 534       $ 458 534 458 898
Cash, end of year $ 505       $ 534       $ 505 $ 534 $ 458
[1] Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.