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Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Balance     $ 2,961,566 $ 2,927,924
Other comprehensive income (loss), Net of Tax Amount $ (17,943) $ 6,886 (63,495) 7,794
Balance 3,167,694 2,997,947 3,167,694 2,997,947
Total        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Balance (107,777) (54,751) (54,754) (55,659)
Other comprehensive income (loss) before reclassifications (18,878) 6,857 (64,409) 12,453
Amounts reclassified from accumulated other comprehensive income (loss) 935 29 914 (4,659)
Other comprehensive income (loss), Net of Tax Amount (17,943) 6,886 (63,495) 7,794
Reclassification from adoption of ASU 2018-02     (7,588)  
Cumulative-effect adjustment from adoption of ASU 2016-01     117  
Balance (125,720) (47,865) (125,720) (47,865)
Net unrealized gains (losses) on cash flow hedges        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Balance (12,137) (12,177) (12,137) (12,217)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 0 40 0 80
Other comprehensive income (loss), Net of Tax Amount 0 40 0 80
Reclassification from adoption of ASU 2018-02     0  
Cumulative-effect adjustment from adoption of ASU 2016-01     0  
Balance (12,137) (12,137) (12,137) (12,137)
Net unrealized gains (losses) on investment securities available for sale        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Balance (96,647) (43,444) (43,470) (44,324)
Other comprehensive income (loss) before reclassifications (18,878) 6,857 (64,409) 12,453
Amounts reclassified from accumulated other comprehensive income (loss) 960 1 960 (4,715)
Other comprehensive income (loss), Net of Tax Amount (17,918) 6,858 (63,449) 7,738
Reclassification from adoption of ASU 2018-02     (7,763)  
Cumulative-effect adjustment from adoption of ASU 2016-01     117  
Balance (114,565) (36,586) (114,565) (36,586)
Post-retirement unfunded health benefit        
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]        
Balance 1,007 870 853 882
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) (25) (12) (46) (24)
Other comprehensive income (loss), Net of Tax Amount (25) (12) (46) (24)
Reclassification from adoption of ASU 2018-02     175  
Cumulative-effect adjustment from adoption of ASU 2016-01     0  
Balance $ 982 $ 858 $ 982 $ 858