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Loans - Accruing And Non-Accruing Loans By Class (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income $ 31,061,111 [1] $ 27,535,532 [1] $ 27,658,929
Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 30,841,035 27,312,619  
Total Accruing 30,898,946 27,387,783  
Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 36,052 42,703  
Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 21,859 32,461  
Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 100,382 101,879  
Total Non-Accruing 162,165 147,749  
Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 20,217 11,831  
Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 41,566 34,039  
Commercial | Commercial, financial, and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 20,051,091 16,514,328 16,057,273
Commercial | Commercial, financial, and industrial | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 19,967,302 16,463,919  
Total Accruing 19,976,779 16,474,552  
Commercial | Commercial, financial, and industrial | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 7,442 8,858  
Commercial | Commercial, financial, and industrial | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,035 1,775  
Commercial | Commercial, financial, and industrial | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 36,564 26,325  
Total Non-Accruing 74,312 39,776  
Commercial | Commercial, financial, and industrial | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 14,385 5,537  
Commercial | Commercial, financial, and industrial | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 23,363 7,914  
Commercial | Commercial, financial, and industrial | General C&I      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 15,395,996 14,198,499  
Commercial | Commercial, financial, and industrial | General C&I | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 15,314,292 14,153,275  
Total Accruing 15,321,684 14,161,611  
Commercial | Commercial, financial, and industrial | General C&I | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 7,155 8,234  
Commercial | Commercial, financial, and industrial | General C&I | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 237 102  
Commercial | Commercial, financial, and industrial | General C&I | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 36,564 26,325  
Total Non-Accruing 74,312 36,888  
Commercial | Commercial, financial, and industrial | General C&I | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 14,385 5,537  
Commercial | Commercial, financial, and industrial | General C&I | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 23,363 5,026  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 4,410,883 2,023,746  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 4,410,883 2,023,746  
Total Accruing 4,410,883 2,023,746  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | TRUPs      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 218,287 250,353  
Valuation allowance 19,100 20,200  
Commercial | Commercial, financial, and industrial | TRUPs | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 218,287 247,465  
Total Accruing 218,287 247,465  
Commercial | Commercial, financial, and industrial | TRUPs | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | TRUPs | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | TRUPs | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 2,888  
Commercial | Commercial, financial, and industrial | TRUPs | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | TRUPs | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 2,888  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 25,925 41,730  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 23,840 39,433  
Total Accruing 25,925 41,730  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 287 624  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,798 1,673  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 4,337,017 4,030,870 4,214,695
Commercial | Commercial real estate | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 4,334,283 4,025,398  
Total Accruing 4,335,192 4,027,879  
Commercial | Commercial real estate | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 814 729  
Commercial | Commercial real estate | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 95 1,752  
Commercial | Commercial real estate | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 62  
Total Non-Accruing 1,825 2,991  
Commercial | Commercial real estate | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 485 0  
Commercial | Commercial real estate | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,340 2,929  
Commercial | Commercial real estate | Income CRE      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 4,244,082 3,879,814  
Commercial | Commercial real estate | Income CRE | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 4,242,044 3,876,229  
Total Accruing 4,242,723 3,876,855  
Commercial | Commercial real estate | Income CRE | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 679 626  
Commercial | Commercial real estate | Income CRE | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial real estate | Income CRE | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 30  
Total Non-Accruing 1,359 2,959  
Commercial | Commercial real estate | Income CRE | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 19 0  
Commercial | Commercial real estate | Income CRE | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,340 2,929  
Commercial | Commercial real estate | Residential C R E      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 87,960 135,893  
Commercial | Commercial real estate | Residential C R E | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 87,487 135,861  
Total Accruing 87,494 135,861  
Commercial | Commercial real estate | Residential C R E | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 7 0  
Commercial | Commercial real estate | Residential C R E | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial real estate | Residential C R E | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 32  
Total Non-Accruing 466 32  
Commercial | Commercial real estate | Residential C R E | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 466 0  
Commercial | Commercial real estate | Residential C R E | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 4,975 15,163  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 4,752 13,308  
Total Accruing 4,975 15,163  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 128 103  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 95 1,752  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Consumer real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 6,006,749 6,249,516 6,479,242
Consumer | Consumer real estate | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 5,898,847 6,120,405  
Total Accruing 5,935,436 6,166,868  
Consumer | Consumer real estate | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 22,506 24,217  
Consumer | Consumer real estate | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 14,083 22,246  
Consumer | Consumer real estate | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 56,008 64,155  
Total Non-Accruing 71,313 82,648  
Consumer | Consumer real estate | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 5,232 5,238  
Consumer | Consumer real estate | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 10,073 13,255  
Consumer | Consumer real estate | Home Equity Line of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 1,286,875 1,526,537  
Consumer | Consumer real estate | Home Equity Line of Credit | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 1,217,344 1,443,651  
Total Accruing 1,232,169 1,465,433  
Consumer | Consumer real estate | Home Equity Line of Credit | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 9,156 11,653  
Consumer | Consumer real estate | Home Equity Line of Credit | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 5,669 10,129  
Consumer | Consumer real estate | Home Equity Line of Credit | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 43,007 49,009  
Total Non-Accruing 54,706 61,104  
Consumer | Consumer real estate | Home Equity Line of Credit | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 4,227 3,314  
Consumer | Consumer real estate | Home Equity Line of Credit | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 7,472 8,781  
Consumer | Consumer real estate | R/E installment loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 4,695,108 4,691,169  
Consumer | Consumer real estate | R/E installment loans | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 4,662,783 4,652,658  
Total Accruing 4,678,501 4,669,625  
Consumer | Consumer real estate | R/E installment loans | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 10,580 10,470  
Consumer | Consumer real estate | R/E installment loans | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 5,138 6,497  
Consumer | Consumer real estate | R/E installment loans | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 13,001 15,146  
Total Non-Accruing 16,607 21,544  
Consumer | Consumer real estate | R/E installment loans | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,005 1,924  
Consumer | Consumer real estate | R/E installment loans | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,601 4,474  
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 24,766 31,810  
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 18,720 24,096  
Total Accruing 24,766 31,810  
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,770 2,094  
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 3,276 5,620  
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Consumer real estate | RE Installment Purchase Credit Impaired Loans | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Permanent Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 170,390 222,448 287,820
Consumer | Permanent Mortgage | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 149,663 193,591  
Total Accruing 156,009 200,738  
Consumer | Permanent Mortgage | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,314 2,585  
Consumer | Permanent Mortgage | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 4,032 4,562  
Consumer | Permanent Mortgage | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 7,709 11,227  
Total Non-Accruing 14,381 21,710  
Consumer | Permanent Mortgage | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 71 996  
Consumer | Permanent Mortgage | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 6,601 9,487  
Consumer | Credit Card and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 495,864 518,370 $ 619,899
Consumer | Credit Card and Other | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 490,940 509,306  
Total Accruing 495,530 517,746  
Consumer | Credit Card and Other | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,976 6,314  
Consumer | Credit Card and Other | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,614 2,126  
Consumer | Credit Card and Other | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 101 110  
Total Non-Accruing 334 624  
Consumer | Credit Card and Other | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 44 60  
Consumer | Credit Card and Other | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 189 454  
Consumer | Credit Card and Other | Credit Card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 201,171 191,345  
Consumer | Credit Card and Other | Credit Card | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 198,917 188,009  
Total Accruing 201,171 191,345  
Consumer | Credit Card and Other | Credit Card | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,076 2,133  
Consumer | Credit Card and Other | Credit Card | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,178 1,203  
Consumer | Credit Card and Other | Credit Card | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Consumer | Credit Card and Other | Credit Card | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Credit Card and Other | Credit Card | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Credit Card and Other | Other Consumer Loans Class      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 294,173 325,271  
Consumer | Credit Card and Other | Other Consumer Loans Class | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 291,700 320,551  
Total Accruing 293,839 324,647  
Consumer | Credit Card and Other | Other Consumer Loans Class | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,802 3,570  
Consumer | Credit Card and Other | Other Consumer Loans Class | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 337 526  
Consumer | Credit Card and Other | Other Consumer Loans Class | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 101 110  
Total Non-Accruing 334 624  
Consumer | Credit Card and Other | Other Consumer Loans Class | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 44 60  
Consumer | Credit Card and Other | Other Consumer Loans Class | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 189 454  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 520 1,754  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 323 746  
Total Accruing 520 1,754  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 98 611  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 99 397  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due $ 0 $ 0  
[1] December 31, 2019 and 2018 include $18.8 million and $28.6 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.