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Loans - Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Collectively evaluated for impairment $ 33,124,956   $ 27,638,617
Individually evaluated for impairment 253,347   275,148
Total loans, net of unearned income 33,378,303 [1] $ 31,061,111 [1] 27,990,048
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Collectively evaluated for impairment   24,273,207  
Individually evaluated for impairment   84,001  
C&I | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 1,353,795    
2020, Collectively evaluated for impairment 1,353,795    
2020, Individually evaluated for impairment 0    
2019 4,331,540    
2019, Collectively evaluated for impairment 4,318,769    
2019, Individually evaluated for impairment 12,771    
2018 1,987,368    
2018, Collectively evaluated for impairment 1,974,726    
2018, Individually evaluated for impairment 12,642    
2017 1,455,846    
2017, Collectively evaluated for impairment 1,441,294    
2017, Individually evaluated for impairment 14,552    
2016 1,192,245    
2016, Collectively evaluated for impairment 1,190,418    
2016, Individually evaluated for impairment 1,827    
Prior to 2016 1,508,325    
Prior to 2016, Collectively evaluated for impairment 1,484,180    
Prior to 2016, Individually evaluated for impairment 24,145    
Non-Revolving Loans 5,713,914    
Non-Revolving, Collectively evaluated for impairment 5,713,914    
Non-Revolving, Individually evaluated for impairment 0    
Revolving Loans 4,512,973    
Revolving, Collectively evaluated for impairment 4,478,985    
Revolving, Individually evaluated for impairment 33,988    
Revolving Loans converted to term loans (c) 68,424    
Revolving loans converted to term loans, collectively evaluated for impairment 68,257    
Revolving loans converted to term loan, Individually evaluated for impairment 167    
Collectively evaluated for impairment 22,024,338   17,056,034
Individually evaluated for impairment 100,092   83,253
Total loans, net of unearned income 22,124,430 20,051,091 17,176,112
Revolving loan converted to term loan during period 14,100    
C&I | C&I | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Collectively evaluated for impairment   15,313,558  
Individually evaluated for impairment   82,438  
Total loans, net of unearned income 16,195,161 15,395,996  
C&I | Loans to Mortgage Companies | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Collectively evaluated for impairment   4,410,883  
Individually evaluated for impairment   0  
Total loans, net of unearned income 5,713,914 4,410,883  
C&I | TRUPS | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Prior to 2016 215,400    
Collectively evaluated for impairment   218,287  
Individually evaluated for impairment   0  
Total loans, net of unearned income 215,355 218,287  
C&I | PD Grade 1 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 27,293    
2019 100,359    
2018 125,095    
2017 81,397    
2016 112,175    
Prior to 2016 117,965    
Non-Revolving Loans 0    
Revolving Loans 156,041    
Revolving Loans converted to term loans (c) 223    
Total loans, net of unearned income 720,548    
C&I | PD Grade 2 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 33,244    
2019 239,750    
2018 95,269    
2017 81,542    
2016 176,068    
Prior to 2016 112,586    
Non-Revolving Loans 0    
Revolving Loans 108,408    
Revolving Loans converted to term loans (c) 51    
Total loans, net of unearned income 846,918    
C&I | PD Grade 3 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 15,083    
2019 165,433    
2018 52,645    
2017 96,725    
2016 65,932    
Prior to 2016 119,415    
Non-Revolving Loans 1,028,798    
Revolving Loans 219,037    
Revolving Loans converted to term loans (c) 14,042    
Total loans, net of unearned income 1,777,110    
C&I | PD Grade 3 | TRUPS | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Prior to 2016 3,300    
C&I | PD Grade 4 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 144,129    
2019 318,374    
2018 155,173    
2017 140,516    
2016 158,705    
Prior to 2016 149,248    
Non-Revolving Loans 958,145    
Revolving Loans 372,890    
Revolving Loans converted to term loans (c) 277    
Total loans, net of unearned income 2,397,457    
C&I | PD Grade 4 | TRUPS | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Prior to 2016 42,400    
C&I | PD Grade 5 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 149,048    
2019 604,067    
2018 306,849    
2017 161,921    
2016 127,011    
Prior to 2016 228,347    
Non-Revolving Loans 927,946    
Revolving Loans 507,991    
Revolving Loans converted to term loans (c) 14,230    
Total loans, net of unearned income 3,027,410    
C&I | PD Grade 5 | TRUPS | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Prior to 2016 84,500    
C&I | PD Grade 6 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 187,540    
2019 713,579    
2018 244,128    
2017 241,828    
2016 107,498    
Prior to 2016 201,660    
Non-Revolving Loans 1,740,304    
Revolving Loans 801,860    
Revolving Loans converted to term loans (c) 16,485    
Total loans, net of unearned income 4,254,882    
C&I | PD Grade 6 | TRUPS | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Prior to 2016 27,300    
C&I | PD Grade 7 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 270,190    
2019 903,326    
2018 395,680    
2017 167,749    
2016 91,881    
Prior to 2016 156,238    
Non-Revolving Loans 806,853    
Revolving Loans 794,174    
Revolving Loans converted to term loans (c) 447    
Total loans, net of unearned income 3,586,538    
C&I | PD Grade 7 | TRUPS | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Prior to 2016 7,400    
C&I | PD Grade 8 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 224,670    
2019 626,348    
2018 217,091    
2017 178,183    
2016 33,476    
Prior to 2016 115,727    
Non-Revolving Loans 140,372    
Revolving Loans 495,002    
Revolving Loans converted to term loans (c) 7,096    
Total loans, net of unearned income 2,037,965    
C&I | PD Grade 9 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 128,773    
2019 332,262    
2018 92,720    
2017 91,648    
2016 60,522    
Prior to 2016 93,750    
Non-Revolving Loans 68,707    
Revolving Loans 419,388    
Revolving Loans converted to term loans (c) 2,055    
Total loans, net of unearned income 1,289,825    
C&I | PD Grade 9 | TRUPS | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Prior to 2016 31,900    
C&I | PD Grade 10 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 65,206    
2019 128,169    
2018 113,744    
2017 56,088    
2016 60,659    
Prior to 2016 53,920    
Non-Revolving Loans 25,023    
Revolving Loans 191,883    
Revolving Loans converted to term loans (c) 996    
Total loans, net of unearned income 695,688    
C&I | PD Grade 10 | TRUPS | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Prior to 2016 18,600    
C&I | PD Grade 11 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 29,742    
2019 95,269    
2018 65,404    
2017 64,494    
2016 75,508    
Prior to 2016 52,240    
Non-Revolving Loans 0    
Revolving Loans 109,709    
Revolving Loans converted to term loans (c) 3,618    
Total loans, net of unearned income 495,984    
C&I | PD Grade 12 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 25,376    
2019 36,918    
2018 46,792    
2017 41,370    
2016 19,248    
Prior to 2016 28,881    
Non-Revolving Loans 17,766    
Revolving Loans 114,052    
Revolving Loans converted to term loans (c) 1,112    
Total loans, net of unearned income 331,515    
C&I | PD Grade 13 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 18,233    
2019 32,564    
2018 12,153    
2017 11,247    
2016 84,321    
Prior to 2016 39,710    
Non-Revolving Loans 0    
Revolving Loans 63,993    
Revolving Loans converted to term loans (c) 383    
Total loans, net of unearned income 262,604    
C&I | PD Grade 14 15 16 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 35,268    
2019 22,351    
2018 51,983    
2017 26,586    
2016 17,414    
Prior to 2016 14,493    
Non-Revolving Loans 0    
Revolving Loans 124,557    
Revolving Loans converted to term loans (c) 7,242    
Total loans, net of unearned income 299,894    
Commercial real estate | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Collectively evaluated for impairment 4,639,529   3,936,727
Individually evaluated for impairment 163   1,879
Total loans, net of unearned income 4,639,692 4,337,017 $ 3,946,943
Commercial real estate | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 612,468    
2020, Collectively evaluated for impairment 612,468    
2020, Individually evaluated for impairment 0    
2019 1,446,695    
2019, Collectively evaluated for impairment 1,446,695    
2019, Individually evaluated for impairment 0    
2018 722,120    
2018, Collectively evaluated for impairment 722,120    
2018, Individually evaluated for impairment 0    
2017 763,613    
2017, Collectively evaluated for impairment 763,613    
2017, Individually evaluated for impairment 0    
2016 358,331    
2016, Collectively evaluated for impairment 358,331    
2016, Individually evaluated for impairment 0    
Prior to 2016 441,584    
Prior to 2016, Collectively evaluated for impairment 441,421    
Prior to 2016, Individually evaluated for impairment 163    
Revolving Loans 203,300    
Revolving, Collectively evaluated for impairment 203,300    
Revolving, Individually evaluated for impairment 0    
Revolving Loans converted to term loans (c) 17,292    
Revolving loans converted to term loans, collectively evaluated for impairment 17,292    
Revolving loans converted to term loan, Individually evaluated for impairment 0    
Collectively evaluated for impairment 4,565,240 4,242,519  
Individually evaluated for impairment 163 1,563  
Total loans, net of unearned income 4,565,403 4,244,082  
Commercial real estate | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 10,351    
2020, Collectively evaluated for impairment 10,351    
2020, Individually evaluated for impairment 0    
2019 29,433    
2019, Collectively evaluated for impairment 29,433    
2019, Individually evaluated for impairment 0    
2018 7,726    
2018, Collectively evaluated for impairment 7,726    
2018, Individually evaluated for impairment 0    
2017 2,782    
2017, Collectively evaluated for impairment 2,782    
2017, Individually evaluated for impairment 0    
2016 621    
2016, Collectively evaluated for impairment 621    
2016, Individually evaluated for impairment 0    
Prior to 2016 1,894    
Prior to 2016, Collectively evaluated for impairment 1,894    
Prior to 2016, Individually evaluated for impairment 0    
Revolving Loans 21,482    
Revolving, Collectively evaluated for impairment 21,482    
Revolving, Individually evaluated for impairment 0    
Revolving Loans converted to term loans (c) 0    
Revolving loans converted to term loans, collectively evaluated for impairment 0    
Revolving loans converted to term loan, Individually evaluated for impairment 0    
Collectively evaluated for impairment 74,289 87,960  
Individually evaluated for impairment 0 0  
Total loans, net of unearned income 74,289 $ 87,960  
Commercial real estate | PD Grade 1 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 22,307    
2019 0    
2018 398    
2017 0    
2016 130    
Prior to 2016 1,102    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 23,937    
Commercial real estate | PD Grade 1 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior to 2016 23    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 23    
Commercial real estate | PD Grade 2 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 445    
2019 30,859    
2018 651    
2017 333    
2016 1,211    
Prior to 2016 2,410    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 35,909    
Commercial real estate | PD Grade 2 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior to 2016 0    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 0    
Commercial real estate | PD Grade 3 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 62,707    
2019 207,828    
2018 78,203    
2017 75,629    
2016 65,898    
Prior to 2016 29,466    
Revolving Loans 68,770    
Revolving Loans converted to term loans (c) 188    
Total loans, net of unearned income 588,689    
Commercial real estate | PD Grade 3 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 0    
2019 0    
2018 272    
2017 175    
2016 0    
Prior to 2016 106    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 553    
Commercial real estate | PD Grade 4 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 65,474    
2019 287,116    
2018 98,370    
2017 122,518    
2016 75,032    
Prior to 2016 63,680    
Revolving Loans 934    
Revolving Loans converted to term loans (c) 3,234    
Total loans, net of unearned income 716,358    
Commercial real estate | PD Grade 4 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 95    
2019 886    
2018 0    
2017 313    
2016 0    
Prior to 2016 124    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 1,418    
Commercial real estate | PD Grade 5 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 192,596    
2019 296,099    
2018 160,253    
2017 233,104    
2016 114,572    
Prior to 2016 35,705    
Revolving Loans 36,944    
Revolving Loans converted to term loans (c) 10,729    
Total loans, net of unearned income 1,080,002    
Commercial real estate | PD Grade 5 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 79    
Prior to 2016 0    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 79    
Commercial real estate | PD Grade 6 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 81,162    
2019 215,741    
2018 143,419    
2017 143,142    
2016 34,758    
Prior to 2016 133,573    
Revolving Loans 33,021    
Revolving Loans converted to term loans (c) 195    
Total loans, net of unearned income 785,011    
Commercial real estate | PD Grade 6 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 5,568    
2019 6,252    
2018 42    
2017 338    
2016 44    
Prior to 2016 349    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 12,593    
Commercial real estate | PD Grade 7 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 122,282    
2019 224,637    
2018 140,601    
2017 85,853    
2016 19,369    
Prior to 2016 35,968    
Revolving Loans 36,633    
Revolving Loans converted to term loans (c) 2,432    
Total loans, net of unearned income 667,775    
Commercial real estate | PD Grade 7 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 0    
2019 527    
2018 2,904    
2017 1,795    
2016 0    
Prior to 2016 190    
Revolving Loans 21,382    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 26,798    
Commercial real estate | PD Grade 8 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 15,635    
2019 76,102    
2018 54,998    
2017 15,421    
2016 29,382    
Prior to 2016 50,736    
Revolving Loans 6,239    
Revolving Loans converted to term loans (c) 132    
Total loans, net of unearned income 248,645    
Commercial real estate | PD Grade 8 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 150    
2019 312    
2018 463    
2017 0    
2016 0    
Prior to 2016 153    
Revolving Loans 100    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 1,178    
Commercial real estate | PD Grade 9 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 25,288    
2019 29,485    
2018 23,192    
2017 27,916    
2016 4,169    
Prior to 2016 39,457    
Revolving Loans 38    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 149,545    
Commercial real estate | PD Grade 9 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 0    
2019 0    
2018 263    
2017 0    
2016 498    
Prior to 2016 79    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 840    
Commercial real estate | PD Grade 10 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 15,437    
2019 15,563    
2018 7,260    
2017 3,805    
2016 8,973    
Prior to 2016 17,006    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 150    
Total loans, net of unearned income 68,194    
Commercial real estate | PD Grade 10 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 0    
2019 735    
2018 266    
2017 0    
2016 0    
Prior to 2016 77    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 1,078    
Commercial real estate | PD Grade 11 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 1,696    
2019 19,007    
2018 11,372    
2017 22,561    
2016 3,931    
Prior to 2016 16,481    
Revolving Loans 128    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 75,176    
Commercial real estate | PD Grade 11 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 3,517    
2019 20,693    
2018 3,471    
2017 161    
2016 0    
Prior to 2016 477    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 28,319    
Commercial real estate | PD Grade 12 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 0    
2019 15,050    
2018 2,445    
2017 697    
2016 554    
Prior to 2016 10,877    
Revolving Loans 71    
Revolving Loans converted to term loans (c) 232    
Total loans, net of unearned income 29,926    
Commercial real estate | PD Grade 12 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior to 2016 161    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 161    
Commercial real estate | PD Grade 13 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 418    
2019 9,672    
2018 913    
2017 2,185    
2016 223    
Prior to 2016 1,325    
Revolving Loans 138    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 14,874    
Commercial real estate | PD Grade 13 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 1,006    
2019 0    
2018 45    
2017 0    
2016 0    
Prior to 2016 9    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 1,060    
Commercial real estate | PD Grade 14 15 16 | Income CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 7,021    
2019 19,536    
2018 45    
2017 30,449    
2016 129    
Prior to 2016 3,635    
Revolving Loans 20,384    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income 81,199    
Commercial real estate | PD Grade 14 15 16 | Residential CRE | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2020 15    
2019 28    
2018 0    
2017 0    
2016 0    
Prior to 2016 146    
Revolving Loans 0    
Revolving Loans converted to term loans (c) 0    
Total loans, net of unearned income $ 189    
[1]
March 31, 2020 and December 31, 2019 include $20.8 million and $18.8 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.