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Other Comprehensive Income (Details 2) - 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
Net gain on securities transactions $ 21,595 $ 22,116 $ 21,625 $ 21,180 $ 20,444 $ 21,645 $ 26,452 $ 18,973 $ 86,516 $ 87,514 $ 77,576
Tax expense (benefit)                 (27,045) (28,962) $ (25,404)
Net retirement plan actuarial loss                      
Total before tax [1],[2]                 (1,338) (2,218)  
Net retirement plan prior service credit                      
Total before tax                 (76) 359  
Net retirement plan transition liability                      
Total before tax [1],[2]                 0    
Employee Benefit Plans                      
Total before tax [1]                 (1,414) (1,859)  
Tax benefit [1]                 (565) (744)  
Net of tax [1]                 (849) (1,115)  
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized gains and losses on available-for-sale securities                      
Net gain on securities transactions [1]                 926 1,108  
Tax expense (benefit) [1]                 (370) (443)  
Net of tax [1]                 $ 556 $ 665  
[1] Amounts in parentheses indicate debits in income statement.
[2] The accumulated other comprehensive income components are included in the computation of net periodic benefit cost (See Note 12 - “Employee Benefit Plans”).