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Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment, Aging [Abstract]    
Minimum number of days past due for nonaccrual loan status 90 days  
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing $ 26,823 $ 22,852
61 - 90 Days Past Due Accruing 6,563 5,277
Greater Than 90 Days Past Due Accruing 2,004 2,448
Total Past Due Accruing 35,390 30,577
Non-Accrual 40,525 39,676
Current 5,214,795 4,207,363
Ending balance of loans 5,290,710 4,277,616
Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 22,888  
61 - 90 Days Past Due Accruing 5,382  
Greater Than 90 Days Past Due Accruing 1,939  
Total Past Due Accruing 30,209  
Non-Accrual 34,985 39,676
Current 4,156,620  
Ending balance of loans 4,221,814  
ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 3,935  
61 - 90 Days Past Due Accruing 1,181  
Greater Than 90 Days Past Due Accruing 65  
Total Past Due Accruing 5,181  
Non-Accrual 5,540  
Current 1,058,175  
Ending balance of loans 1,068,896  
Commercial Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Ending balance of loans 2,368,897 2,003,371
Commercial Loans [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Non-Accrual 20,559 21,437
Commercial Loans [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Non-Accrual 2,039  
Commercial Loans [Member] | Commercial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   0
61 - 90 Days Past Due Accruing   0
Greater Than 90 Days Past Due Accruing   0
Total Past Due Accruing   0
Non-Accrual   4,985
Current   556,496
Ending balance of loans   561,481
Commercial Loans [Member] | Commercial [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 195  
61 - 90 Days Past Due Accruing 20  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 215  
Non-Accrual 2,622 4,985
Current 583,101  
Ending balance of loans 585,938  
Commercial Loans [Member] | Commercial [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 473  
61 - 90 Days Past Due Accruing 5  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 478  
Non-Accrual 446  
Current 137,215  
Ending balance of loans 138,139  
Commercial Loans [Member] | Commercial Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   126
61 - 90 Days Past Due Accruing   0
Greater Than 90 Days Past Due Accruing   0
Total Past Due Accruing   126
Non-Accrual   7,977
Current   966,692
Ending balance of loans   974,795
Commercial Loans [Member] | Commercial Real Estate [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 1,692  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 1,692  
Non-Accrual 10,716 7,977
Current 875,555  
Ending balance of loans 887,963  
Commercial Loans [Member] | Commercial Real Estate [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 0  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 0  
Non-Accrual 0  
Current 242,322  
Ending balance of loans 242,322  
Commercial Loans [Member] | Agricultural [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   22
61 - 90 Days Past Due Accruing   0
Greater Than 90 Days Past Due Accruing   0
Total Past Due Accruing   22
Non-Accrual   699
Current   63,037
Ending balance of loans   63,758
Commercial Loans [Member] | Agricultural [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 154  
61 - 90 Days Past Due Accruing 20  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 174  
Non-Accrual 595 699
Current 63,834  
Ending balance of loans 64,603  
Commercial Loans [Member] | Agricultural [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 0  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 0  
Non-Accrual 0  
Current 25  
Ending balance of loans 25  
Commercial Loans [Member] | Agricultural Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   108
61 - 90 Days Past Due Accruing   0
Greater Than 90 Days Past Due Accruing   103
Total Past Due Accruing   211
Non-Accrual   1,038
Current   36,128
Ending balance of loans   37,377
Commercial Loans [Member] | Agricultural Real Estate [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 349  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 349  
Non-Accrual 968 1,038
Current 30,894  
Ending balance of loans 32,211  
Commercial Loans [Member] | Business Banking [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   3,019
61 - 90 Days Past Due Accruing   708
Greater Than 90 Days Past Due Accruing   45
Total Past Due Accruing   3,772
Non-Accrual   6,738
Current   355,450
Ending balance of loans   365,960
Commercial Loans [Member] | Business Banking [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 2,176  
61 - 90 Days Past Due Accruing 590  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 2,766  
Non-Accrual 5,658 6,738
Current 328,763  
Ending balance of loans 337,187  
Commercial Loans [Member] | Business Banking [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 74  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 74  
Non-Accrual 1,593  
Current 78,842  
Ending balance of loans 80,509  
Commercial Loans [Member] | Total Commercial Loan [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   3,275
61 - 90 Days Past Due Accruing   708
Greater Than 90 Days Past Due Accruing   148
Total Past Due Accruing   4,131
Non-Accrual   21,437
Current   1,977,803
Ending balance of loans   2,003,371
Commercial Loans [Member] | Total Commercial Loan [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 4,566  
61 - 90 Days Past Due Accruing 630  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 5,196  
Non-Accrual 20,559  
Current 1,882,147  
Ending balance of loans 1,907,902  
Commercial Loans [Member] | Total Commercial Loan [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 547  
61 - 90 Days Past Due Accruing 5  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 552  
Non-Accrual 2,039  
Current 458,404  
Ending balance of loans 460,995  
Consumer Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Ending balance of loans 1,920,171 1,623,138
Consumer Loans [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Non-Accrual 8,012 9,070
Consumer Loans [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Non-Accrual 638  
Consumer Loans [Member] | Indirect [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   10,956
61 - 90 Days Past Due Accruing   2,477
Greater Than 90 Days Past Due Accruing   1,205
Total Past Due Accruing   14,638
Non-Accrual   1,557
Current   964,802
Ending balance of loans   980,997
Consumer Loans [Member] | Indirect [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 10,749  
61 - 90 Days Past Due Accruing 2,259  
Greater Than 90 Days Past Due Accruing 832  
Total Past Due Accruing 13,840  
Non-Accrual 1,301 1,557
Current 1,033,903  
Ending balance of loans 1,049,044  
Consumer Loans [Member] | Indirect [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 751  
61 - 90 Days Past Due Accruing 162  
Greater Than 90 Days Past Due Accruing 23  
Total Past Due Accruing 936  
Non-Accrual 139  
Current 164,267  
Ending balance of loans 165,342  
Consumer Loans [Member] | Home Equity Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   6,065
61 - 90 Days Past Due Accruing   1,223
Greater Than 90 Days Past Due Accruing   681
Total Past Due Accruing   7,969
Non-Accrual   7,247
Current   560,066
Ending balance of loans   575,282
Consumer Loans [Member] | Home Equity Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 6,475  
61 - 90 Days Past Due Accruing 1,198  
Greater Than 90 Days Past Due Accruing 704  
Total Past Due Accruing 8,377  
Non-Accrual 6,583 7,247
Current 525,429  
Ending balance of loans 540,389  
Consumer Loans [Member] | Home Equity Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 307  
61 - 90 Days Past Due Accruing 754  
Greater Than 90 Days Past Due Accruing 38  
Total Past Due Accruing 1,099  
Non-Accrual 425  
Current 93,370  
Ending balance of loans 94,894  
Consumer Loans [Member] | Direct [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   717
61 - 90 Days Past Due Accruing   144
Greater Than 90 Days Past Due Accruing   84
Total Past Due Accruing   945
Non-Accrual   266
Current   65,648
Ending balance of loans   66,859
Consumer Loans [Member] | Direct [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 611  
61 - 90 Days Past Due Accruing 210  
Greater Than 90 Days Past Due Accruing 45  
Total Past Due Accruing 866  
Non-Accrual 128 266
Current 60,593  
Ending balance of loans 61,587  
Consumer Loans [Member] | Direct [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 38  
61 - 90 Days Past Due Accruing 30  
Greater Than 90 Days Past Due Accruing 4  
Total Past Due Accruing 72  
Non-Accrual 74  
Current 8,769  
Ending balance of loans 8,915  
Consumer Loans [Member] | Total Consumer Loan [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   17,738
61 - 90 Days Past Due Accruing   3,844
Greater Than 90 Days Past Due Accruing   1,970
Total Past Due Accruing   23,552
Non-Accrual   9,070
Current   1,590,516
Ending balance of loans   1,623,138
Consumer Loans [Member] | Total Consumer Loan [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 17,835  
61 - 90 Days Past Due Accruing 3,667  
Greater Than 90 Days Past Due Accruing 1,581  
Total Past Due Accruing 23,083  
Non-Accrual 8,012  
Current 1,619,925  
Ending balance of loans 1,651,020  
Consumer Loans [Member] | Total Consumer Loan [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 1,096  
61 - 90 Days Past Due Accruing 946  
Greater Than 90 Days Past Due Accruing 65  
Total Past Due Accruing 2,107  
Non-Accrual 638  
Current 266,406  
Ending balance of loans 269,151  
Residential Real Estate Mortgages [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing   1,839
61 - 90 Days Past Due Accruing   725
Greater Than 90 Days Past Due Accruing   330
Total Past Due Accruing   2,894
Non-Accrual   9,169
Current   639,044
Ending balance of loans 1,001,642 651,107
Residential Real Estate Mortgages [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 487  
61 - 90 Days Past Due Accruing 1,085  
Greater Than 90 Days Past Due Accruing 358  
Total Past Due Accruing 1,930  
Non-Accrual 6,414 9,169
Current 654,548  
Ending balance of loans 662,892  
Residential Real Estate Mortgages [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 2,292  
61 - 90 Days Past Due Accruing 230  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 2,522  
Non-Accrual 2,863  
Current 333,365  
Ending balance of loans $ 338,750