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Parent Corporation Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities                      
Net income $ 30,242 $ 46,718 $ 41,426 $ 50,440 $ 39,360 $ 38,502 $ 43,601 $ 37,032 $ 168,826 $ 158,495 $ 165,861
Adjustments to reconcile net income to net cash provided by operating activities:                      
Stock-based compensation expense                 12,089 10,449 8,973
Net realized losses                 (6,359) 4,937 (13,171)
Amortization - other                 52,100 61,671 59,688
Changes in assets and liabilities:                      
Decrease (increase) in net federal income taxes                 30,918 11,150 25,004
Decrease in other assets                 9,872 30,071 11,523
Increase (decrease) in other liabilities                 27,297 9,191 77,564
Net cash provided by operating activities                 370,733 301,783 381,580
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (2,130,362) (1,982,023) (1,041,916)
Redemption and maturities of fixed income securities, available-for-sale                 555,216 641,524 567,445
Sale of fixed income securities, available for sale                 58,832 102,868 106,621
Purchase of short-term investments                 (4,280,553) (3,499,380) (1,602,327)
Sale of short-term investments                 4,338,318 3,470,022 1,539,480
Net cash used in investing activities                 (331,075) (318,101) (391,543)
Financing Activities                      
Dividends to stockholders                 (37,045) (33,758) (31,052)
Acquisition of treasury stock                 (6,015) (4,992) (4,182)
Net proceeds from stock purchase and compensation plans                 7,599 7,811 10,089
Excess tax benefits from share-based payment arrangements                 0 1,819 1,736
Net cash used in financing activities                 (39,582) 15,878 (13,098)
Cash, beginning of year       458       898 458 898 23,959
Cash, end of year 534       458       534 458 898
Parent Company [Member]                      
Operating Activities                      
Net income                 168,826 158,495 165,861
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax                 (131,797) (135,425) (141,495)
Stock-based compensation expense                 12,089 10,449 8,973
Net realized losses                 15 220 0
Amortization - other                 678 648 740
Changes in assets and liabilities:                      
Increase in accrued long-term stock compensation                 4,988 5,564 4,575
Decrease (increase) in net federal income taxes                 3,811 (3,612) (3,052)
Decrease in other assets                 (60) (202) (12)
Increase (decrease) in other liabilities                 714 80 (202)
Net cash provided by operating activities                 59,264 36,217 35,388
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (58,832) (45,789) (33,717)
Redemption and maturities of fixed income securities, available-for-sale                 10,465 14,983 21,578
Sale of fixed income securities, available for sale                 31,819 18,768 0
Purchase of short-term investments                 (185,590) (119,501) (106,933)
Sale of short-term investments                 179,292 130,841 94,422
Net cash used in investing activities                 (22,846) (698) (24,650)
Financing Activities                      
Dividends to stockholders                 (37,045) (33,758) (31,052)
Acquisition of treasury stock                 (6,015) (4,992) (4,182)
Net proceeds from stock purchase and compensation plans                 7,599 7,811 10,089
Excess tax benefits from share-based payment arrangements                 0 1,819 1,736
Principal payments of borrowings from subsidiaries                 (881) (6,839) (2,798)
Net cash used in financing activities                 (36,342) (35,959) (26,207)
Net increase (decrease) in cash                 76 (440) (15,469)
Cash, beginning of year       $ 458       $ 898 458 898 16,367
Cash, end of year $ 534       $ 458       $ 534 $ 458 $ 898