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Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 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 $ 27,633 $ 22,852
61 - 90 Days Past Due Accruing 6,462 5,277
Greater Than 90 Days Past Due Accruing 3,286 2,448
Total Past Due Accruing 37,381 30,577
Non-Accrual 41,418 39,676
Current 5,288,432 4,207,363
Ending balance of loans 5,367,231 4,277,616
Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 23,217  
61 - 90 Days Past Due Accruing 6,013  
Greater Than 90 Days Past Due Accruing 3,098  
Total Past Due Accruing 32,328  
Non-Accrual 34,107 39,676
Current 4,299,030  
Ending balance of loans 4,365,465  
ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 4,416  
61 - 90 Days Past Due Accruing 449  
Greater Than 90 Days Past Due Accruing 188  
Total Past Due Accruing 5,053  
Non-Accrual 7,311  
Current 989,402  
Ending balance of loans 1,001,766  
Commercial Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Ending balance of loans 2,378,848 2,003,371
Commercial Loans [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Non-Accrual 19,944 21,437
Commercial Loans [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Non-Accrual 2,769  
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 76  
61 - 90 Days Past Due Accruing 1,031  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 1,107  
Non-Accrual 4,409 4,985
Current 589,008  
Ending balance of loans 594,524  
Commercial Loans [Member] | Commercial [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 70  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 70  
Non-Accrual 102  
Current 114,202  
Ending balance of loans 114,374  
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 478  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 478  
Non-Accrual 8,642 7,977
Current 910,134  
Ending balance of loans 919,254  
Commercial Loans [Member] | Commercial Real Estate [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 232  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 232  
Non-Accrual 1,329  
Current 243,233  
Ending balance of loans 244,794  
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 140  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 140  
Non-Accrual 1,076 699
Current 63,576  
Ending balance of loans 64,792  
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 0  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 0  
Non-Accrual 868 1,038
Current 34,071  
Ending balance of loans 34,939  
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 1,900  
61 - 90 Days Past Due Accruing 675  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 2,575  
Non-Accrual 4,949 6,738
Current 325,009  
Ending balance of loans 332,533  
Commercial Loans [Member] | Business Banking [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 246  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 246  
Non-Accrual 1,338  
Current 72,054  
Ending balance of loans 73,638  
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 2,594  
61 - 90 Days Past Due Accruing 1,706  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 4,300  
Non-Accrual 19,944  
Current 1,921,798  
Ending balance of loans 1,946,042  
Commercial Loans [Member] | Total Commercial Loan [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 548  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 548  
Non-Accrual 2,769  
Current 429,489  
Ending balance of loans 432,806  
Consumer Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Ending balance of loans 1,960,225 1,623,138
Consumer Loans [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Non-Accrual 7,497 9,070
Consumer Loans [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
Non-Accrual 682  
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 10,530  
61 - 90 Days Past Due Accruing 2,331  
Greater Than 90 Days Past Due Accruing 1,229  
Total Past Due Accruing 14,090  
Non-Accrual 1,440 1,557
Current 1,098,286  
Ending balance of loans 1,113,816  
Consumer Loans [Member] | Indirect [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 526  
61 - 90 Days Past Due Accruing 116  
Greater Than 90 Days Past Due Accruing 32  
Total Past Due Accruing 674  
Non-Accrual 258  
Current 143,588  
Ending balance of loans 144,520  
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 6,513  
61 - 90 Days Past Due Accruing 1,648  
Greater Than 90 Days Past Due Accruing 768  
Total Past Due Accruing 8,929  
Non-Accrual 5,965 7,247
Current 527,428  
Ending balance of loans 542,322  
Consumer Loans [Member] | Home Equity Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 750  
61 - 90 Days Past Due Accruing 0  
Greater Than 90 Days Past Due Accruing 154  
Total Past Due Accruing 904  
Non-Accrual 353  
Current 89,443  
Ending balance of loans 90,700  
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 625  
61 - 90 Days Past Due Accruing 156  
Greater Than 90 Days Past Due Accruing 107  
Total Past Due Accruing 888  
Non-Accrual 92 266
Current 59,638  
Ending balance of loans 60,618  
Consumer Loans [Member] | Direct [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 113  
61 - 90 Days Past Due Accruing 16  
Greater Than 90 Days Past Due Accruing 2  
Total Past Due Accruing 131  
Non-Accrual 71  
Current 8,047  
Ending balance of loans 8,249  
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 17,668  
61 - 90 Days Past Due Accruing 4,135  
Greater Than 90 Days Past Due Accruing 2,104  
Total Past Due Accruing 23,907  
Non-Accrual 7,497  
Current 1,685,352  
Ending balance of loans 1,716,756  
Consumer Loans [Member] | Total Consumer Loan [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 1,389  
61 - 90 Days Past Due Accruing 132  
Greater Than 90 Days Past Due Accruing 188  
Total Past Due Accruing 1,709  
Non-Accrual 682  
Current 241,078  
Ending balance of loans 243,469  
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 1,028,158 651,107
Residential Real Estate Mortgages [Member] | Originated loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 2,955  
61 - 90 Days Past Due Accruing 172  
Greater Than 90 Days Past Due Accruing 994  
Total Past Due Accruing 4,121  
Non-Accrual 6,666 9,169
Current 691,880  
Ending balance of loans 702,667  
Residential Real Estate Mortgages [Member] | ACQUIRED [Member]
    
Financing Receivable, Recorded Investment, Past Due [Abstract]    
31 - 60 Days Past Due Accruing 2,479  
61 - 90 Days Past Due Accruing 317  
Greater Than 90 Days Past Due Accruing 0  
Total Past Due Accruing 2,796  
Non-Accrual 3,860  
Current 318,835  
Ending balance of loans $ 325,491