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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans $ 22,833,827 $ 20,928,709  
PCI Loans 762,998 809,169 $ 950,516
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 14,799,054 13,760,703  
PCI Loans 396,938 499,970  
Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 669,215 649,157  
PCI Loans 13,654 20,766  
Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 9,729,022 9,026,220  
PCI Loans 358,103 453,013  
Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 473,433 351,291  
PCI Loans 17,124 12,645  
Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,730,407 2,567,501  
PCI Loans 6,374 11,844  
Commercial | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 894,801 826,270  
Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 302,176 340,264  
PCI Loans 1,683 1,702  
Commercial | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 1,683 1,702  
Commercial | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 14,348,308 13,370,678  
PCI Loans 204,851 258,819  
Commercial | Pass | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 665,197 645,232  
PCI Loans 5,336 8,103  
Commercial | Pass | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 9,521,019 8,821,439  
PCI Loans 181,353 234,023  
Commercial | Pass | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 468,942 347,509  
PCI Loans 13,830 8,744  
Commercial | Pass | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,511,307 2,402,659  
PCI Loans 4,057 7,253  
Commercial | Pass | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 883,779 818,008  
Commercial | Pass | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 298,064 335,831  
Commercial | Pass | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 275 696  
Commercial | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 131,983 106,252  
PCI Loans 63,257 69,520  
Commercial | Special Mention | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 691 2,236  
PCI Loans 320 950  
Commercial | Special Mention | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 78,643 76,084  
PCI Loans 61,295 67,848  
Commercial | Special Mention | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 1,260 1,433  
PCI Loans 323 102  
Commercial | Special Mention | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 44,130 22,804  
PCI Loans 374 620  
Commercial | Special Mention | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 4,340 2,675  
Commercial | Special Mention | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,919 1,020  
Commercial | Special Mention | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 945 0  
Commercial | Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 161,794 157,593  
PCI Loans 117,068 154,278  
Commercial | Substandard | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 3,327 1,683  
PCI Loans 5,792 7,850  
Commercial | Substandard | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 128,848 126,863  
PCI Loans 106,807 138,312  
Commercial | Substandard | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 3,224 2,349  
PCI Loans 2,163 3,462  
Commercial | Substandard | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 18,617 17,870  
PCI Loans 1,843 3,648  
Commercial | Substandard | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 6,585 5,415  
Commercial | Substandard | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 1,193 3,413  
Commercial | Substandard | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 463 1,006  
Commercial | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 647 348  
PCI Loans 11,735 17,333  
Commercial | Doubtful | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 6  
PCI Loans 2,206 3,863  
Commercial | Doubtful | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 262 334  
PCI Loans 8,648 12,830  
Commercial | Doubtful | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 0  
PCI Loans 808 337  
Commercial | Doubtful | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 385 8  
PCI Loans 73 303  
Commercial | Doubtful | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 0  
Commercial | Doubtful | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 0  
Commercial | Doubtful | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 0 0  
Commercial | Ungraded      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 156,322 125,832  
PCI Loans 27 20  
Commercial | Ungraded | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 0  
PCI Loans 0 0  
Commercial | Ungraded | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 250 1,500  
PCI Loans 0 0  
Commercial | Ungraded | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 7 0  
PCI Loans 0 0  
Commercial | Ungraded | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 155,968 124,160  
PCI Loans 27 20  
Commercial | Ungraded | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 97 172  
Commercial | Ungraded | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 0  
Commercial | Ungraded | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 0 0  
Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 8,034,773 7,168,006  
PCI Loans 366,060 309,199  
Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 248,289 231,400  
Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 3,523,786 2,889,124  
Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,701,525 2,601,344  
Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 1,561,173 1,446,138  
PCI Loans 2,190 1,772  
Non-PCI Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 22,833,827 20,928,709  
Current 22,688,955 20,799,457  
Past Due 144,872 129,252  
Non-PCI Loans | Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 669,215 649,157  
Current 667,925 646,987  
Past Due 1,290 2,170  
Non-PCI Loans | Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 9,729,022 9,026,220  
Current 9,707,869 9,001,526  
Past Due 21,153 24,694  
Non-PCI Loans | Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 473,433 351,291  
Current 473,251 350,981  
Past Due 182 310  
Non-PCI Loans | Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,730,407 2,567,501  
Current 2,720,937 2,556,430  
Past Due 9,470 11,071  
Non-PCI Loans | Commercial | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 894,801 826,270  
Current 890,678 823,788  
Past Due 4,123 2,482  
Non-PCI Loans | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 302,176 340,264  
Current 301,849 339,994  
Past Due 327 270  
Non-PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 8,034,773 7,168,006  
Current 7,926,446 7,079,751  
Non-PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 248,289 231,400  
Current 239,648 229,106  
Past Due 8,641 2,294  
Non-PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 3,523,786 2,889,124  
Current 3,465,935 2,839,045  
Past Due 57,851 50,079  
Non-PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,701,525 2,601,344  
Current 2,674,390 2,576,942  
Past Due 27,135 24,402  
Non-PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 1,561,173 1,446,138  
Current 1,546,473 1,434,658  
Past Due 14,700 11,480  
PCI Loans | Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 13,654 20,766  
PCI Loans | Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 358,103 453,013  
PCI Loans | Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 17,124 12,645  
PCI Loans | Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 6,374 11,844  
PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 315,113 265,529  
PCI Loans 366,060 309,199  
PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 2 0  
PCI Loans 644 0  
PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 257,166 230,065  
PCI Loans 299,318 268,777  
PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 55,871 33,827  
PCI Loans 63,908 38,650  
PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 2,074 1,637  
PCI Loans 2,190 1,772  
PCI Loans | Noncommercial | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 3,873 3,474  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 80,031 72,876  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 491 1,845  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 12,288 11,592  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 107 310  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 6,694 7,918  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,983 1,175  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 188 72  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 57,280 49,964  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 7,154 1,139  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 27,886 27,760  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 13,428 14,290  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 8,812 6,775  
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 13,343 10,281  
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 10,525 9,595  
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,767 618  
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 51 68  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 19,050 18,472  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 442 39  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,375 2,773  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,510 2,102  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 167 444  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 6 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 14,550 13,114  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 108 598  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 8,064 7,039  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 3,485 2,698  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,893 2,779  
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 6,212 6,800  
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 642 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 4,846 6,528  
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 701 268  
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 23 4  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 45,791 37,904  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 357 286  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 6,490 10,329  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 75 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,266 1,051  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 973 863  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 133 198  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 36,497 25,177  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,379 557  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 21,901 15,280  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 10,222 7,414  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,995 1,926  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 31,392 26,589  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 26,781 22,589  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 4,569 3,937  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due $ 42 $ 63