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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dividends declared (in dollars per share)   $ 0.50 $ 0.44 $ 1.40 $ 1.32  
Schedule of Accumulated Other Income (Loss) [Abstract]            
Balance, Beginning of Period       $ (36,174) $ (10,967)  
Transition adjustment for unrealized gains and losses on equity securities           $ (2,709)
Net change in unrealized gain (loss)   $ (35,941) $ 512 (166,464) 33,881  
Reclassification adjustments included in earnings:            
Loss (gain) on available for sale securities, net   (250) (2,487) 802 (4,916)  
Other comprehensive income (loss), before income taxes   (36,191) (1,975) (165,662) 28,965  
Federal and state income taxes   (9,134) (768) (42,183) [1] 11,241 [2]  
Other comprehensive income (loss), net of income taxes   (27,057) (1,207) (123,479) 17,724  
Balance, End of Period   (162,362) 6,757 (162,362) 6,757  
Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member]            
Schedule of Accumulated Other Income (Loss) [Abstract]            
Balance, Beginning of Period       (35,385) (9,087)  
Transition adjustment for unrealized gains and losses on equity securities           (2,709)
Net change in unrealized gain (loss)       (166,464) 33,876  
Reclassification adjustments included in earnings:            
Loss (gain) on available for sale securities, net       802 (4,916)  
Other comprehensive income (loss), before income taxes       (165,662) 28,960  
Federal and state income taxes       (42,183) [1] 11,239 [2]  
Other comprehensive income (loss), net of income taxes       (123,479) 17,721  
Balance, End of Period   (161,573) 8,634 (161,573) 8,634  
Accumulated Unrealized Gain (Loss) on Employee Benefit Plans [Member]            
Schedule of Accumulated Other Income (Loss) [Abstract]            
Balance, Beginning of Period       (789) (1,880)  
Transition adjustment for unrealized gains and losses on equity securities           $ 0
Net change in unrealized gain (loss)       0 5  
Reclassification adjustments included in earnings:            
Loss (gain) on available for sale securities, net       0 0  
Other comprehensive income (loss), before income taxes       0 5  
Federal and state income taxes       0 [1] 2 [2]  
Other comprehensive income (loss), net of income taxes       0 3  
Balance, End of Period   $ (789) $ (1,877) $ (789) $ (1,877)  
Subsequent Event [Member]            
Dividends Payable, Date Declared Oct. 30, 2018          
Dividends declared (in dollars per share) $ 0.50          
Dividends Payable, Date to be Paid Nov. 26, 2018          
Dividends Payable, Date of Record Nov. 12, 2018          
[1] Calculated using a 25 percent blended federal and state statutory tax rate.
[2] Calculated using a 39 percent blended federal and state statutory tax rate.