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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 24, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dividends declared (in dollars per share)   $ 0.45 $ 0.44 $ 0.90 $ 0.88  
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)   $ (33,117) $ 21,958 (130,523) 33,369  
Reclassification adjustments included in earnings:            
Loss (gain) on available for sale securities, net   762 (380) 1,052 (2,429)  
Other comprehensive income (loss), before income taxes   (32,355) 21,578 (129,471) 30,940  
Federal and state income taxes   (8,241) 8,393 (33,049) [1] 12,009 [2]  
Other comprehensive income (loss), net of income taxes   (24,114) 13,185 (96,422) 18,931  
Balance, End of Period   (135,305) 7,964 (135,305) 7,964  
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)       (130,523) 33,369  
Reclassification adjustments included in earnings:            
Loss (gain) on available for sale securities, net       1,052 (2,429)  
Other comprehensive income (loss), before income taxes       (129,471) 30,940  
Federal and state income taxes       (33,049) [1] 12,009 [2]  
Other comprehensive income (loss), net of income taxes       (96,422) 18,931  
Balance, End of Period   (134,516) 9,844 (134,516) 9,844  
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 0  
Reclassification adjustments included in earnings:            
Loss (gain) on available for sale securities, net       0 0  
Other comprehensive income (loss), before income taxes       0 0  
Federal and state income taxes       0 [1] 0 [2]  
Other comprehensive income (loss), net of income taxes       0 0  
Balance, End of Period   $ (789) $ (1,880) $ (789) $ (1,880)  
Subsequent Event [Member]            
Dividends Payable, Date Declared Jul. 24, 2018          
Dividends declared (in dollars per share) $ 0.50          
Dividends Payable, Date to be Paid Aug. 27, 2018          
Dividends Payable, Date of Record Aug. 13, 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.