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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Allowance for loan losses [Roll Forward]              
Beginning balance $ 215,142 $ 250,061 $ 230,682 $ 246,159      
Provision for loan losses 4,408 1,030 709 5,843      
Loans charged off (11,073) (5,825) (29,068) (10,850)      
Recoveries 2,092 2,437 8,246 6,551      
Ending balance 210,569 247,703 210,569 247,703      
Allowance for off-balance sheet credit losses [Roll Forward]              
Beginning balance 2,433 6,431 3,734 11,244      
Provision for off-balance sheet credit losses (408) (1,030) (1,709) (5,843)      
Ending balance 2,025 5,401 2,025 5,401      
Total provision for credit losses 4,000 0 (1,000) 0      
Recorded investment [Abstract]              
Collectively measured for impairment, recorded investment         $ 18,196,467 $ 16,965,550 $ 16,981,198
Individually measured for impairment, recorded investment         152,992 187,874 225,636
Total         18,349,459 17,153,424 17,206,834
Related allowance [Abstract]              
Collectively measured for impairment, related allowance         177,882 199,634 206,341
Individually measured for impairment, related allowance         13,797 8,831 13,284
Total 215,142 250,061 210,569 246,159 210,569 230,682 247,703
Commercial [Member]              
Allowance for loan losses [Roll Forward]              
Beginning balance 113,722 137,742 124,269 140,213      
Provision for loan losses (1,285) 2,474 2,720 665      
Loans charged off (9,602) (4,429) (24,940) (6,556)      
Recoveries 1,263 1,014 2,049 2,479      
Ending balance 104,098 136,801 104,098 136,801      
Allowance for off-balance sheet credit losses [Roll Forward]              
Beginning balance 2,361 6,301 3,644 11,063      
Provision for off-balance sheet credit losses (424) (976) (1,707) (5,738)      
Ending balance 1,937 5,325 1,937 5,325      
Total provision for credit losses (1,709) 1,498 1,013 (5,073)      
Recorded investment [Abstract]              
Collectively measured for impairment, recorded investment         11,466,611 10,596,672 10,619,034
Individually measured for impairment, recorded investment         109,490 137,303 176,900
Total         11,576,101 10,733,975 10,795,934
Related allowance [Abstract]              
Collectively measured for impairment, related allowance         90,301 115,438 123,517
Individually measured for impairment, related allowance         13,797 8,831 13,284
Total 113,722 137,742 124,269 136,801 104,098 124,269 136,801
Commercial real estate [Member]              
Allowance for loan losses [Roll Forward]              
Beginning balance 58,758 58,580 56,621 50,749      
Provision for loan losses 1,391 (2,914) 248 4,050      
Loans charged off 0 0 0 (76)      
Recoveries 40 739 3,320 1,682      
Ending balance 60,189 56,405 60,189 56,405      
Allowance for off-balance sheet credit losses [Roll Forward]              
Beginning balance 17 84 45 123      
Provision for off-balance sheet credit losses 19 (49) (9) (88)      
Ending balance 36 35 36 35      
Total provision for credit losses 1,410 (2,963) 239 3,962      
Recorded investment [Abstract]              
Collectively measured for impairment, recorded investment         3,803,359 3,477,132 3,515,167
Individually measured for impairment, recorded investment         1,316 2,855 2,975
Total         3,804,675 3,479,987 3,518,142
Related allowance [Abstract]              
Collectively measured for impairment, related allowance         60,189 56,621 56,405
Individually measured for impairment, related allowance         0 0 0
Total 58,758 58,580 56,621 50,749 60,189 56,621 56,405
Residential mortgage [Member]              
Allowance for loan losses [Roll Forward]              
Beginning balance 18,544 18,259 18,451 18,224      
Provision for loan losses 1 168 (418) 82      
Loans charged off (91) (168) (326) (444)      
Recoveries 229 134 976 531      
Ending balance 18,683 18,393 18,683 18,393      
Allowance for off-balance sheet credit losses [Roll Forward]              
Beginning balance 53 38 43 50      
Provision for off-balance sheet credit losses (3) 1 7 (11)      
Ending balance 50 39 50 39      
Total provision for credit losses (2) 169 (411) 71      
Recorded investment [Abstract]              
Collectively measured for impairment, recorded investment         1,929,825 1,926,239 1,900,244
Individually measured for impairment, recorded investment         41,917 47,447 45,506
Total         1,971,742 1,973,686 1,945,750
Related allowance [Abstract]              
Collectively measured for impairment, related allowance         18,683 18,451 18,393
Individually measured for impairment, related allowance         0 0 0
Total 18,544 18,259 18,683 18,224 18,683 18,451 18,393
Personal [Member]              
Allowance for loan losses [Roll Forward]              
Beginning balance 8,646 8,106 9,124 8,773      
Provision for loan losses 883 598 1,486 1,168      
Loans charged off (1,380) (1,228) (3,802) (3,774)      
Recoveries 560 550 1,901 1,859      
Ending balance 8,709 8,026 8,709 8,026      
Allowance for off-balance sheet credit losses [Roll Forward]              
Beginning balance 2 8 2 8      
Provision for off-balance sheet credit losses 0 (6) 0 (6)      
Ending balance 2 2 2 2      
Total provision for credit losses 883 592 1,486 1,162      
Recorded investment [Abstract]              
Collectively measured for impairment, recorded investment         996,672 965,507 946,753
Individually measured for impairment, recorded investment         269 269 255
Total         996,941 965,776 947,008
Related allowance [Abstract]              
Collectively measured for impairment, related allowance         8,709 9,124 8,026
Individually measured for impairment, related allowance         0 0 0
Total 8,646 8,106 8,709 8,026 8,709 9,124 8,026
Specific Allowance [Member]              
Allowance for loan losses [Roll Forward]              
Beginning balance     208,465        
Ending balance 191,679 219,625 191,679 219,625      
Recorded investment [Abstract]              
Collectively measured for impairment, recorded investment         18,196,467 16,965,550 16,981,198
Individually measured for impairment, recorded investment         152,992 187,874 225,636
Total         18,349,459 17,153,424 17,206,834
Related allowance [Abstract]              
Collectively measured for impairment, related allowance         177,882 199,634 206,341
Individually measured for impairment, related allowance         13,797 8,831 13,284
Total 191,679 219,625 191,679 219,625 191,679 208,465 219,625
Nonspecific Allowance [Member]              
Allowance for loan losses [Roll Forward]              
Beginning balance 15,472 27,374 22,217 28,200      
Provision for loan losses 3,418 704 (3,327) (122)      
Loans charged off 0 0 0 0      
Recoveries 0 0 0 0      
Ending balance 18,890 28,078 18,890 28,078      
Allowance for off-balance sheet credit losses [Roll Forward]              
Beginning balance 0 0 0 0      
Provision for off-balance sheet credit losses 0 0 0 0      
Ending balance 0 0 0 0      
Total provision for credit losses 3,418 704 (3,327) (122)      
Recorded investment [Abstract]              
Collectively measured for impairment, recorded investment         0 0 0
Individually measured for impairment, recorded investment         0 0 0
Total         0 0 0
Related allowance [Abstract]              
Collectively measured for impairment, related allowance         0 0 0
Individually measured for impairment, related allowance         0 0 0
Total $ 15,472 $ 27,374 $ 22,217 $ 28,078 $ 18,890 $ 22,217 $ 28,078