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Allowance for Loan Losses Accruing and Non-Accruing Troubled Debt Restructurings (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment $ 136,505 $ 150,487 $ 166,327
Originated Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 81,733 [1] 84,649 [1] 89,588 [1]
Financing Receivable, Recorded Investment, Current 9,712,992 8,652,722 8,231,707
Financing Receivable, Recorded Investment, Past Due 76,147 78,937 84,713
Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 266 [1]    
Financing Receivable, Recorded Investment, Current 3,728,402    
Financing Receivable, Recorded Investment, Past Due 97,349    
Originated Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment   84,649 89,588
Covered TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 54,506 [1] 65,838 [1] 76,739 [1]
Accruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 117,728 135,453 147,003
Financing Receivable, Recorded Investment, Current 70,718 77,630 92,430
Financing Receivable, Recorded Investment, Past Due 47,010 57,823 54,573
Accruing TDRs | Originated Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 63,026    
Financing Receivable, Recorded Investment, Current 57,915    
Financing Receivable, Recorded Investment, Past Due 5,111    
Accruing TDRs | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 196    
Financing Receivable, Recorded Investment, Current 196    
Financing Receivable, Recorded Investment, Past Due 0    
Accruing TDRs | Originated Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment   69,615 70,264
Financing Receivable, Recorded Investment, Current   61,544 63,110
Financing Receivable, Recorded Investment, Past Due   8,071 7,154
Accruing TDRs | Covered TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 54,506 65,838 76,739
Financing Receivable, Recorded Investment, Current 12,607 16,086 29,320
Financing Receivable, Recorded Investment, Past Due 41,899 49,752 47,419
Nonaccruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 18,777 15,034 19,324
Financing Receivable, Recorded Investment, Current 10,543 9,336 12,032
Financing Receivable, Recorded Investment, Past Due 8,234 5,698 7,292
Nonaccruing TDRs | Originated Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 18,707    
Financing Receivable, Recorded Investment, Current 10,543    
Financing Receivable, Recorded Investment, Past Due 8,164    
Nonaccruing TDRs | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 70    
Financing Receivable, Recorded Investment, Current 0    
Financing Receivable, Recorded Investment, Past Due 70    
Nonaccruing TDRs | Originated Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment   15,034 19,324
Financing Receivable, Recorded Investment, Current   9,336 12,032
Financing Receivable, Recorded Investment, Past Due   5,698 7,292
Nonaccruing TDRs | Covered TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 0 0 0
Financing Receivable, Recorded Investment, Current 0 0 0
Financing Receivable, Recorded Investment, Past Due 0 0 0
Total Tdr Allowance
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 7,621 11,297 15,365
Total Tdr Allowance | Originated Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 3,342    
Total Tdr Allowance | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 0    
Total Tdr Allowance | Originated Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance   4,600 4,118
Total Tdr Allowance | Covered TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 4,279 6,697 11,247
C&I
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 6,998 [1] 4,380 [1] 7,691 [1]
C&I | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 6    
C&I | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 5,455 [1] 2,617 [1] 2,413 [1]
C&I | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 1,537 1,763 5,278
C&I | Accruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 4,966 3,471 6,233
Financing Receivable, Recorded Investment, Current 4,044 1,139 1,955
Financing Receivable, Recorded Investment, Past Due 922 2,332 4,278
C&I | Accruing TDRs | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 0    
Financing Receivable, Recorded Investment, Current 0    
Financing Receivable, Recorded Investment, Past Due 0    
C&I | Accruing TDRs | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 3,429 1,708 955
Financing Receivable, Recorded Investment, Current 3,249 704 955
Financing Receivable, Recorded Investment, Past Due 180 1,004 0
C&I | Accruing TDRs | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 1,537 1,763 5,278
Financing Receivable, Recorded Investment, Current 795 435 1,000
Financing Receivable, Recorded Investment, Past Due 742 1,328 4,278
C&I | Nonaccruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 2,032 909 1,458
Financing Receivable, Recorded Investment, Current 395 844 865
Financing Receivable, Recorded Investment, Past Due 1,637 65 593
C&I | Nonaccruing TDRs | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 6    
Financing Receivable, Recorded Investment, Current 0    
Financing Receivable, Recorded Investment, Past Due 6    
C&I | Nonaccruing TDRs | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 2,026 909 1,458
Financing Receivable, Recorded Investment, Current 395 844 865
Financing Receivable, Recorded Investment, Past Due 1,631 65 593
C&I | Nonaccruing TDRs | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 0 0 0
Financing Receivable, Recorded Investment, Current 0 0 0
Financing Receivable, Recorded Investment, Past Due 0 0 0
C&I | Total Tdr Allowance
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 1,182 735 1,653
C&I | Total Tdr Allowance | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 0    
C&I | Total Tdr Allowance | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 736 217 126
C&I | Total Tdr Allowance | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 446 518 1,527
Commercial Real Estate
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 58,532 [1] 66,577 [1] 69,843 [1]
Commercial Real Estate | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 15,508 [1] 16,305 [1] 17,763 [1]
Commercial Real Estate | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 43,024 50,272 52,080
Commercial Real Estate | Accruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 53,704 63,784 66,153
Financing Receivable, Recorded Investment, Current 15,812 20,377 28,907
Financing Receivable, Recorded Investment, Past Due 37,892 43,407 37,246
Commercial Real Estate | Accruing TDRs | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 10,680 13,512 14,073
Financing Receivable, Recorded Investment, Current 10,333 12,719 11,609
Financing Receivable, Recorded Investment, Past Due 347 793 2,464
Commercial Real Estate | Accruing TDRs | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 43,024 50,272 52,080
Financing Receivable, Recorded Investment, Current 5,479 7,658 17,298
Financing Receivable, Recorded Investment, Past Due 37,545 42,614 34,782
Commercial Real Estate | Nonaccruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 4,828 2,793 3,690
Financing Receivable, Recorded Investment, Current 1,976 461 473
Financing Receivable, Recorded Investment, Past Due 2,852 2,332 3,217
Commercial Real Estate | Nonaccruing TDRs | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 4,828 2,793 3,690
Financing Receivable, Recorded Investment, Current 1,976 461 473
Financing Receivable, Recorded Investment, Past Due 2,852 2,332 3,217
Commercial Real Estate | Nonaccruing TDRs | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 0 0 0
Financing Receivable, Recorded Investment, Current 0 0 0
Financing Receivable, Recorded Investment, Past Due 0 0 0
Commercial Real Estate | Total Tdr Allowance
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 3,126 5,828 8,489
Commercial Real Estate | Total Tdr Allowance | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 294 869 401
Commercial Real Estate | Total Tdr Allowance | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 2,832 4,959 8,088
Construction
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 4,998 [1] 11,126 [1] 18,216 [1]
Construction | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 958 [1] 2,955 [1] 3,577 [1]
Construction | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 4,040 8,171 14,639
Construction | Accruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 4,935 10,991 18,146
Financing Receivable, Recorded Investment, Current 1,820 4,221 9,831
Financing Receivable, Recorded Investment, Past Due 3,115 6,770 8,315
Construction | Accruing TDRs | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 895 2,820 3,507
Financing Receivable, Recorded Investment, Current 895 1,860 3,507
Financing Receivable, Recorded Investment, Past Due 0 960 0
Construction | Accruing TDRs | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 4,040 8,171 14,639
Financing Receivable, Recorded Investment, Current 925 2,361 6,324
Financing Receivable, Recorded Investment, Past Due 3,115 5,810 8,315
Construction | Nonaccruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 63 135 70
Financing Receivable, Recorded Investment, Current 63 135 70
Financing Receivable, Recorded Investment, Past Due 0 0 0
Construction | Nonaccruing TDRs | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 63 135 70
Financing Receivable, Recorded Investment, Current 63 135 70
Financing Receivable, Recorded Investment, Past Due 0 0 0
Construction | Nonaccruing TDRs | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 0 0 0
Financing Receivable, Recorded Investment, Current 0 0 0
Financing Receivable, Recorded Investment, Past Due 0 0 0
Construction | Total Tdr Allowance
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 1,001 1,325 1,749
Construction | Total Tdr Allowance | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 0 105 117
Construction | Total Tdr Allowance | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 1,001 1,220 1,632
Total commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 70,528 [1] 82,083 [1] 95,750 [1]
Total commercial | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 6    
Total commercial | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 21,921 [1] 21,877 [1] 23,753 [1]
Total commercial | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 48,601 60,206  
Total commercial | Covered TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment     71,997
Total commercial | Accruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 63,605 78,246 90,532
Financing Receivable, Recorded Investment, Current 21,676 25,737 40,693
Financing Receivable, Recorded Investment, Past Due 41,929 52,509 49,839
Total commercial | Accruing TDRs | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 0    
Financing Receivable, Recorded Investment, Current 0    
Financing Receivable, Recorded Investment, Past Due 0    
Total commercial | Accruing TDRs | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 15,004 18,040 18,535
Financing Receivable, Recorded Investment, Current 14,477 15,283 16,071
Financing Receivable, Recorded Investment, Past Due 527 2,757 2,464
Total commercial | Accruing TDRs | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 48,601 60,206  
Financing Receivable, Recorded Investment, Current 7,199 10,454  
Financing Receivable, Recorded Investment, Past Due 41,402 49,752  
Total commercial | Accruing TDRs | Covered TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment     71,997
Financing Receivable, Recorded Investment, Current     24,622
Financing Receivable, Recorded Investment, Past Due     47,375
Total commercial | Nonaccruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 6,923 3,837 5,218
Financing Receivable, Recorded Investment, Current 2,434 1,440 1,408
Financing Receivable, Recorded Investment, Past Due 4,489 2,397 3,810
Total commercial | Nonaccruing TDRs | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 6    
Financing Receivable, Recorded Investment, Current 0    
Financing Receivable, Recorded Investment, Past Due 6    
Total commercial | Nonaccruing TDRs | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 6,917 3,837 5,218
Financing Receivable, Recorded Investment, Current 2,434 1,440 1,408
Financing Receivable, Recorded Investment, Past Due 4,483 2,397 3,810
Total commercial | Nonaccruing TDRs | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 0 0  
Financing Receivable, Recorded Investment, Current 0 0  
Financing Receivable, Recorded Investment, Past Due 0 0  
Total commercial | Nonaccruing TDRs | Covered TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment     0
Financing Receivable, Recorded Investment, Current     0
Financing Receivable, Recorded Investment, Past Due     0
Total commercial | Total Tdr Allowance
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 5,309 7,888 11,891
Total commercial | Total Tdr Allowance | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 0    
Total commercial | Total Tdr Allowance | Originated Loans Commercial
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 1,030 1,191 644
Total commercial | Total Tdr Allowance | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 4,279 6,697  
Total commercial | Total Tdr Allowance | Covered TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance     11,247
Consumer Installment
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 28,578 30,870 32,577
Consumer Installment | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 28,578 30,870 32,577
Consumer Installment | Accruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 25,455 28,632 29,675
Financing Receivable, Recorded Investment, Current 24,194 27,085 28,604
Financing Receivable, Recorded Investment, Past Due 1,261 1,547 1,071
Consumer Installment | Accruing TDRs | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 25,455 28,632 29,675
Financing Receivable, Recorded Investment, Current 24,194 27,085 28,604
Financing Receivable, Recorded Investment, Past Due 1,261 1,547 1,071
Consumer Installment | Nonaccruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 3,123 2,238 2,902
Financing Receivable, Recorded Investment, Current 2,803 2,064 2,882
Financing Receivable, Recorded Investment, Past Due 320 174 20
Consumer Installment | Nonaccruing TDRs | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 3,123 2,238 2,902
Financing Receivable, Recorded Investment, Current 2,803 2,064 2,882
Financing Receivable, Recorded Investment, Past Due 320 174 20
Consumer Installment | Total Tdr Allowance
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 552 1,526 1,674
Consumer Installment | Total Tdr Allowance | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 552 1,526 1,674
Home equity lines
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 12,929 11,913 11,664
Home equity lines | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 6,916 6,281 6,922
Home equity lines | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 260    
Home equity lines | Covered Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 5,753 5,632 4,742
Home equity lines | Accruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 11,605 11,051 10,307
Financing Receivable, Recorded Investment, Current 10,996 10,815 10,092
Financing Receivable, Recorded Investment, Past Due 609 236 215
Home equity lines | Accruing TDRs | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 5,656 5,419 5,565
Financing Receivable, Recorded Investment, Current 5,544 5,183 5,394
Financing Receivable, Recorded Investment, Past Due 112 236 171
Home equity lines | Accruing TDRs | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 196    
Financing Receivable, Recorded Investment, Current 196    
Financing Receivable, Recorded Investment, Past Due 0    
Home equity lines | Accruing TDRs | Covered Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 5,753 5,632 4,742
Financing Receivable, Recorded Investment, Current 5,256 5,632 4,698
Financing Receivable, Recorded Investment, Past Due 497 0 44
Home equity lines | Nonaccruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 1,324 862 1,357
Financing Receivable, Recorded Investment, Current 1,260 636 1,131
Financing Receivable, Recorded Investment, Past Due 64 226 226
Home equity lines | Nonaccruing TDRs | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 1,260 862 1,357
Financing Receivable, Recorded Investment, Current 1,260 636 1,131
Financing Receivable, Recorded Investment, Past Due 0 226 226
Home equity lines | Nonaccruing TDRs | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 64    
Financing Receivable, Recorded Investment, Current 0    
Financing Receivable, Recorded Investment, Past Due 64    
Home equity lines | Nonaccruing TDRs | Covered Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 0 0 0
Financing Receivable, Recorded Investment, Current 0 0 0
Financing Receivable, Recorded Investment, Past Due 0 0 0
Home equity lines | Total Tdr Allowance
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 197 34 95
Home equity lines | Total Tdr Allowance | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 197 34 95
Home equity lines | Total Tdr Allowance | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 0    
Home equity lines | Total Tdr Allowance | Covered Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 0 0 0
Residential Mortgages
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 23,217 [1] 24,009 [1] 24,569 [1]
Residential Mortgages | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 23,065 [1] 24,009 [1] 24,569 [1]
Residential Mortgages | Covered Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 152 [1]    
Residential Mortgages | Accruing TDRs | Covered Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 152    
Financing Receivable, Recorded Investment, Current 152    
Financing Receivable, Recorded Investment, Past Due 0    
Residential Mortgages | Nonaccruing TDRs | Covered Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 0    
Financing Receivable, Recorded Investment, Current 0    
Financing Receivable, Recorded Investment, Past Due 0    
Residential Mortgages | Total Tdr Allowance | Covered Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 0    
Consumer Credit Card Financing Receivable
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 1,253 [1] 1,612 [1] 1,767
Consumer Credit Card Financing Receivable | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 1,253 [1] 1,612 [1] 1,767 [1]
Consumer Credit Card Financing Receivable | Accruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 1,251 1,601 1,764
Financing Receivable, Recorded Investment, Current 1,134 1,483 1,655
Financing Receivable, Recorded Investment, Past Due 117 118 109
Consumer Credit Card Financing Receivable | Accruing TDRs | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 1,251 1,601 1,764
Financing Receivable, Recorded Investment, Current 1,134 1,483 1,655
Financing Receivable, Recorded Investment, Past Due 117 118 109
Consumer Credit Card Financing Receivable | Nonaccruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 2 11 3
Financing Receivable, Recorded Investment, Current 0 0 0
Financing Receivable, Recorded Investment, Past Due 2 11 3
Consumer Credit Card Financing Receivable | Nonaccruing TDRs | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 2 11 3
Financing Receivable, Recorded Investment, Current 0 0 0
Financing Receivable, Recorded Investment, Past Due 2 11 3
Consumer Credit Card Financing Receivable | Total Tdr Allowance
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 261 127 106
Consumer Credit Card Financing Receivable | Total Tdr Allowance | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 261 127 106
Consumer Residential Mortgages Financing Receivable
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 23,217 24,009 24,569
Consumer Residential Mortgages Financing Receivable | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 23,065 24,009 24,569
Consumer Residential Mortgages Financing Receivable | Accruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 15,812 15,923 14,725
Financing Receivable, Recorded Investment, Current 12,718 12,510 11,386
Financing Receivable, Recorded Investment, Past Due 3,094 3,413 3,339
Consumer Residential Mortgages Financing Receivable | Accruing TDRs | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 15,660 15,923 14,725
Financing Receivable, Recorded Investment, Current 12,566 12,510 11,386
Financing Receivable, Recorded Investment, Past Due 3,094 3,413 3,339
Consumer Residential Mortgages Financing Receivable | Nonaccruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 7,405 8,086 9,844
Financing Receivable, Recorded Investment, Current 4,046 5,196 6,611
Financing Receivable, Recorded Investment, Past Due 3,359 2,890 3,233
Consumer Residential Mortgages Financing Receivable | Nonaccruing TDRs | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 7,405 8,086 9,844
Financing Receivable, Recorded Investment, Current 4,046 5,196 6,611
Financing Receivable, Recorded Investment, Past Due 3,359 2,890 3,233
Consumer Residential Mortgages Financing Receivable | Total Tdr Allowance
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 1,302 1,722 1,599
Consumer Residential Mortgages Financing Receivable | Total Tdr Allowance | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 1,302 1,722 1,599
Total consumer
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 65,977 [1] 68,404 [1] 70,577 [1]
Total consumer | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 59,812 [1] 62,772 [1] 65,835 [1]
Total consumer | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 260 [1]    
Total consumer | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 5,905    
Total consumer | Covered Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment     4,742
Total consumer | Accruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 54,123 57,207 56,471
Financing Receivable, Recorded Investment, Current 49,042 51,893 51,737
Financing Receivable, Recorded Investment, Past Due 5,081 5,314 4,734
Total consumer | Accruing TDRs | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 48,022 51,575 51,729
Financing Receivable, Recorded Investment, Current 43,438 46,261 47,039
Financing Receivable, Recorded Investment, Past Due 4,584 5,314 4,690
Total consumer | Accruing TDRs | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 196    
Financing Receivable, Recorded Investment, Current 196    
Financing Receivable, Recorded Investment, Past Due 0    
Total consumer | Accruing TDRs | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 5,905    
Financing Receivable, Recorded Investment, Current 5,408    
Financing Receivable, Recorded Investment, Past Due 497    
Total consumer | Nonaccruing TDRs
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 11,854 11,197 14,106
Financing Receivable, Recorded Investment, Current 8,109 7,896 10,624
Financing Receivable, Recorded Investment, Past Due 3,745 3,301 3,482
Total consumer | Nonaccruing TDRs | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 11,790 11,197 14,106
Financing Receivable, Recorded Investment, Current 8,109 7,896 10,624
Financing Receivable, Recorded Investment, Past Due 3,681 3,301 3,482
Total consumer | Nonaccruing TDRs | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 64    
Financing Receivable, Recorded Investment, Current 0    
Financing Receivable, Recorded Investment, Past Due 64    
Total consumer | Nonaccruing TDRs | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Financing Receivable, Modifications, Recorded Investment 0    
Financing Receivable, Recorded Investment, Current 0    
Financing Receivable, Recorded Investment, Past Due 0    
Total consumer | Total Tdr Allowance
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 2,312 3,409 3,474
Total consumer | Total Tdr Allowance | Originated Consumer Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 2,312 3,409 3,474
Total consumer | Total Tdr Allowance | Acquired Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance 0    
Total consumer | Total Tdr Allowance | Covered Commercial TDR Loans
      
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]      
Impaired Financing Receivable, Related Allowance $ 0    
[1] Note 1: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.