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Business Segments (Operating Results and Other Key Financial Measures) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Segment Reporting Information          
Net interest income before provision for credit losses $ 369,807 $ 348,720 $ 1,099,594 $ 1,017,092  
Provision for credit losses 38,284 10,542 80,108 46,296  
Noninterest Income 51,474 46,502 146,364 169,214  
Noninterest expense 176,630 179,815 541,215 526,369  
Segment income (loss) before income taxes 206,367 204,865 624,635 613,641  
Segment net income 171,416 171,302 485,820 530,683  
Segment assets 43,274,659 39,042,713 43,274,659 39,042,713 $ 41,042,356
Consumer and Business Banking          
Segment Reporting Information          
Net interest income before provision for credit losses 170,183 182,272 536,153 538,568  
Provision for credit losses 4,251 705 8,880 7,212  
Noninterest Income 15,103 13,137 43,378 72,170  
Noninterest expense 86,489 87,640 258,051 259,416  
Segment income (loss) before income taxes 94,546 107,064 312,600 344,110  
Segment net income 67,592 76,711 223,478 246,555  
Segment assets 11,277,171 10,194,291 11,277,171 10,194,291  
Commercial Banking          
Segment Reporting Information          
Net interest income before provision for credit losses 166,106 149,770 477,755 448,128  
Provision for credit losses 34,033 9,837 71,228 39,084  
Noninterest Income 33,731 27,861 91,931 86,043  
Noninterest expense 62,246 57,376 200,093 179,251  
Segment income (loss) before income taxes 103,558 110,418 298,365 315,836  
Segment net income 74,111 79,344 213,331 226,798  
Segment assets 24,885,849 22,930,768 24,885,849 22,930,768  
Other          
Segment Reporting Information          
Net interest income before provision for credit losses 33,518 16,678 85,686 30,396  
Provision for credit losses 0 0 0 0  
Noninterest Income 2,640 5,504 11,055 11,001  
Noninterest expense 27,895 34,799 83,071 87,702  
Segment income (loss) before income taxes 8,263 (12,617) 13,670 (46,305)  
Segment net income 29,713 15,247 49,011 57,330  
Segment assets $ 7,111,639 $ 5,917,654 $ 7,111,639 $ 5,917,654