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Shareholders' Equity and Other Comprehensive Income (OCI) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance $ 2,961,566 $ 2,927,924 $ 3,000,196
Net current period other comprehensive income (loss) (32,195) 905 (25,840)
Ending balance 3,133,602 2,961,566 2,927,924
Accumulated Other Comprehensive Income (Loss)      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (54,754) (55,659) (29,819)
Other comprehensive (loss) income before reclassifications (33,057) 714 (22,342)
Amounts reclassified from accumulated other comprehensive income (loss) 862 191 (3,498)
Net current period other comprehensive income (loss) (32,195) 905 (25,840)
Reclassification from adoption of ASU 2018-02 (7,588)    
Cumulative-effect adjustment from adoption of ASU 2016-01 117    
Ending balance (94,420) (54,754) (55,659)
Net Unrealized Gains (Losses) on Cash Flow Hedges      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (12,137) (12,217) (12,504)
Other comprehensive (loss) income before reclassifications 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 0 80 287
Net current period other comprehensive income (loss) 0 80 287
Reclassification from adoption of ASU 2018-02 0    
Cumulative-effect adjustment from adoption of ASU 2016-01 0    
Ending balance (12,137) (12,137) (12,217)
Net Unrealized Gains (Losses) on Investment Securities Available for Sale      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (43,470) (44,324) (18,222)
Other comprehensive (loss) income before reclassifications (33,023) 676 (22,405)
Amounts reclassified from accumulated other comprehensive income (loss) 960 178 (3,697)
Net current period other comprehensive income (loss) (32,063) 854 (26,102)
Reclassification from adoption of ASU 2018-02 (7,763)    
Cumulative-effect adjustment from adoption of ASU 2016-01 117    
Ending balance (83,179) (43,470) (44,324)
Post-Retirement Unfunded Health Benefit      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance 853 882 907
Other comprehensive (loss) income before reclassifications (34) 38 63
Amounts reclassified from accumulated other comprehensive income (loss) (98) (67) (88)
Net current period other comprehensive income (loss) (132) (29) (25)
Reclassification from adoption of ASU 2018-02 175    
Cumulative-effect adjustment from adoption of ASU 2016-01 0    
Ending balance $ 896 $ 853 $ 882