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Parent Corporation Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Activities                      
Net income $ 39,360 $ 38,502 $ 43,601 $ 37,032 $ 45,389 $ 46,996 $ 33,768 $ 39,708 $ 158,495 $ 165,861 $ 141,827
Adjustments to reconcile net income to net cash provided by operating activities:                      
Stock-based compensation expense                 10,449 8,973 8,702
Net realized losses (gains)                 4,937 (13,171) (26,599)
Amortization - other                 61,671 59,688 45,346
Changes in assets and liabilities:                      
(Increase) decrease in net federal income taxes                 11,150 25,004 31,323
(Decrease) increase in other assets                 30,071 11,523 (1,186)
Increase (decrease) in other liabilities                 9,191 77,564 (35,632)
Net cash provided by operating activities                 301,783 381,580 232,763
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (1,982,023) (1,041,916) (843,616)
Redemption and maturities of fixed income securities, available-for-sale                 641,524 567,445 482,816
Sale of fixed income securities, available for sale                 102,868 106,621 73,415
Purchase of short-term investments                 (3,499,380) (1,602,327) (1,410,123)
Sale of short-term investments                 3,470,022 1,539,480 1,452,402
Net cash (used in) provided by investing activities                 (318,101) (391,543) (169,468)
Financing Activities                      
Dividends to stockholders                 (33,758) (31,052) (28,428)
Acquisition of treasury stock                 (4,992) (4,182) (3,563)
Net proceeds from stock purchase and compensation plans                 7,811 10,089 7,283
Excess tax benefits from share-based payment arrangements                 1,819 1,736 1,020
Net cash used in financing activities                 15,878 (13,098) (39,529)
Cash, beginning of year       898       23,959 898 23,959 193
Cash, end of year 458       898       458 898 23,959
Parent Company [Member]                      
Operating Activities                      
Net income                 158,495 165,861 141,827
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax                 (135,425) (141,495) (115,203)
Stock-based compensation expense                 10,449 8,973 8,702
Net realized losses (gains)                 220 0 (2)
Amortization - other                 648 740 1,421
Changes in assets and liabilities:                      
Increase in accrued long-term stock compensation                 5,564 4,575 1,062
(Increase) decrease in net federal income taxes                 (3,612) (3,052) 10,977
(Decrease) increase in other assets                 (202) (12) 1,165
Increase (decrease) in other liabilities                 80 (202) (120)
Net cash provided by operating activities                 36,217 35,388 49,829
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (45,789) (33,717) (18,511)
Redemption and maturities of fixed income securities, available-for-sale                 14,983 21,578 23,210
Sale of fixed income securities, available for sale                 18,768 0 300
Purchase of short-term investments                 (119,501) (106,933) (102,717)
Sale of short-term investments                 130,841 94,422 101,510
Net cash (used in) provided by investing activities                 (698) (24,650) 3,792
Financing Activities                      
Dividends to stockholders                 (33,758) (31,052) (28,428)
Acquisition of treasury stock                 (4,992) (4,182) (3,563)
Net proceeds from stock purchase and compensation plans                 7,811 10,089 7,283
Excess tax benefits from share-based payment arrangements                 1,819 1,736 1,020
Principal payments of borrowings from subsidiaries                 (6,839) (2,798) (13,759)
Net cash used in financing activities                 (35,959) (26,207) (37,447)
Net (decrease) increase in cash                 (440) (15,469) 16,174
Cash, beginning of year       $ 898       $ 16,367 898 16,367 193
Cash, end of year $ 458       $ 898       $ 458 $ 898 $ 16,367