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Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
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 | $ 26,994 | $ 27,402
61 - 90 Days Past Due Accruing | 5,997 | 6,150
Greater Than 90 Days Past Due Accruing | 1,994 | 4,941
Total Past Due Accruing | 34,985 | 38,493
Non-Accrual | 42,286 | 41,074
Current | 5,693,617 | 5,515,704
Ending balance of loans | 5,770,888 | 5,595,271
Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
Ending balance of loans | 2,565,590 | 2,473,702
Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
Ending balance of loans | 2,051,540 | 2,005,980
Residential Real Estate Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
Ending balance of loans | 1,153,758 | 1,115,589
Originated Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 25,411 | 25,496
61 - 90 Days Past Due Accruing | 5,459 | 5,805
Greater Than 90 Days Past Due Accruing | 1,858 | 4,204
Total Past Due Accruing | 32,728 | 35,505
Non-Accrual | 28,339 | 30,845
Current | 5,018,336 | 4,781,587
Ending balance of loans | 5,079,403 | 4,847,937
Originated Loans [Member] | Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 3,041 | 1,010
61 - 90 Days Past Due Accruing | 179 | 970
Greater Than 90 Days Past Due Accruing | 0 | 84
Total Past Due Accruing | 3,220 | 2,064
Non-Accrual | 13,915 | 13,431
Current | 2,229,037 | 2,124,876
Ending balance of loans | 2,246,172 | 2,140,371
Originated Loans [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 268 | 0
61 - 90 Days Past Due Accruing | 7 | 735
Greater Than 90 Days Past Due Accruing | 0 | 0
Total Past Due Accruing | 275 | 735
Non-Accrual | 22 | 1,012
Current | 629,818 | 613,400
Ending balance of loans | 630,115 | 615,147
Originated Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 1,274 | 192
61 - 90 Days Past Due Accruing | 28 | 0
Greater Than 90 Days Past Due Accruing | 0 | 0
Total Past Due Accruing | 1,302 | 192
Non-Accrual | 6,825 | 4,127
Current | 1,148,828 | 1,064,549
Ending balance of loans | 1,156,955 | 1,068,868
Originated Loans [Member] | Agricultural [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 3 | 0
61 - 90 Days Past Due Accruing | 67 | 0
Greater Than 90 Days Past Due Accruing | 0 | 0
Total Past Due Accruing | 70 | 0
Non-Accrual | 1,041 | 817
Current | 31,704 | 32,130
Ending balance of loans | 32,815 | 32,947
Originated Loans [Member] | Agricultural Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 18 | 19
61 - 90 Days Past Due Accruing | 0 | 0
Greater Than 90 Days Past Due Accruing | 0 | 0
Total Past Due Accruing | 18 | 19
Non-Accrual | 326 | 565
Current | 26,380 | 24,390
Ending balance of loans | 26,724 | 24,974
Originated Loans [Member] | Business Banking [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 1,478 | 799
61 - 90 Days Past Due Accruing | 77 | 235
Greater Than 90 Days Past Due Accruing | 0 | 84
Total Past Due Accruing | 1,555 | 1,118
Non-Accrual | 5,701 | 6,910
Current | 392,307 | 390,407
Ending balance of loans | 399,563 | 398,435
Originated Loans [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 19,501 | 21,585
61 - 90 Days Past Due Accruing | 4,318 | 4,739
Greater Than 90 Days Past Due Accruing | 1,684 | 2,864
Total Past Due Accruing | 25,503 | 29,188
Non-Accrual | 6,838 | 8,644
Current | 1,898,883 | 1,820,892
Ending balance of loans | 1,931,224 | 1,858,724
Originated Loans [Member] | Indirect [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 14,212 | 16,434
61 - 90 Days Past Due Accruing | 3,035 | 3,154
Greater Than 90 Days Past Due Accruing | 1,250 | 1,991
Total Past Due Accruing | 18,497 | 21,579
Non-Accrual | 1,553 | 1,964
Current | 1,378,754 | 1,286,507
Ending balance of loans | 1,398,804 | 1,310,050
Originated Loans [Member] | Home Equity Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 4,941 | 4,591
61 - 90 Days Past Due Accruing | 1,172 | 1,428
Greater Than 90 Days Past Due Accruing | 328 | 821
Total Past Due Accruing | 6,441 | 6,840
Non-Accrual | 5,226 | 6,596
Current | 466,301 | 479,444
Ending balance of loans | 477,968 | 492,880
Originated Loans [Member] | Direct [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 348 | 560
61 - 90 Days Past Due Accruing | 111 | 157
Greater Than 90 Days Past Due Accruing | 106 | 52
Total Past Due Accruing | 565 | 769
Non-Accrual | 59 | 84
Current | 53,828 | 54,941
Ending balance of loans | 54,452 | 55,794
Originated Loans [Member] | Residential Real Estate Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 2,869 | 2,901
61 - 90 Days Past Due Accruing | 962 | 96
Greater Than 90 Days Past Due Accruing | 174 | 1,256
Total Past Due Accruing | 4,005 | 4,253
Non-Accrual | 7,586 | 8,770
Current | 890,416 | 835,819
Ending balance of loans | 902,007 | 848,842
Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 1,583 | 1,906
61 - 90 Days Past Due Accruing | 538 | 345
Greater Than 90 Days Past Due Accruing | 136 | 737
Total Past Due Accruing | 2,257 | 2,988
Non-Accrual | 13,947 | 10,229
Current | 675,281 | 734,117
Ending balance of loans | 691,485 | 747,334
Acquired Loans [Member] | Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 181 | 5
61 - 90 Days Past Due Accruing | 5 | 15
Greater Than 90 Days Past Due Accruing | 0 | 0
Total Past Due Accruing | 186 | 20
Non-Accrual | 10,165 | 6,340
Current | 309,067 | 326,971
Ending balance of loans | 319,418 | 333,331
Acquired Loans [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 0 | 0
61 - 90 Days Past Due Accruing | 0 | 0
Greater Than 90 Days Past Due Accruing | 0 | 0
Total Past Due Accruing | 0 | 0
Non-Accrual | 2,509 | 3,009
Current | 75,153 | 72,255
Ending balance of loans | 77,662 | 75,264
Acquired Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 0 | 0
61 - 90 Days Past Due Accruing | 0 | 0
Greater Than 90 Days Past Due Accruing | 0 | 0
Total Past Due Accruing | 0 | 0
Non-Accrual | 7,204 | 2,666
Current | 182,634 | 197,222
Ending balance of loans | 189,838 | 199,888
Acquired Loans [Member] | Business Banking [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 181 | 5
61 - 90 Days Past Due Accruing | 5 | 15
Greater Than 90 Days Past Due Accruing | 0 | 0
Total Past Due Accruing | 186 | 20
Non-Accrual | 452 | 665
Current | 51,280 | 57,494
Ending balance of loans | 51,918 | 58,179
Acquired Loans [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 393 | 739
61 - 90 Days Past Due Accruing | 127 | 65
Greater Than 90 Days Past Due Accruing | 75 | 66
Total Past Due Accruing | 595 | 870
Non-Accrual | 716 | 696
Current | 119,005 | 145,690
Ending balance of loans | 120,316 | 147,256
Acquired Loans [Member] | Indirect [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 242 | 518
61 - 90 Days Past Due Accruing | 32 | 5
Greater Than 90 Days Past Due Accruing | 0 | 54
Total Past Due Accruing | 274 | 577
Non-Accrual | 125 | 106
Current | 43,418 | 64,540
Ending balance of loans | 43,817 | 65,223
Acquired Loans [Member] | Home Equity Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 130 | 190
61 - 90 Days Past Due Accruing | 61 | 60
Greater Than 90 Days Past Due Accruing | 67 | 5
Total Past Due Accruing | 258 | 255
Non-Accrual | 555 | 557
Current | 71,457 | 75,904
Ending balance of loans | 72,270 | 76,716
Acquired Loans [Member] | Direct [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 21 | 31
61 - 90 Days Past Due Accruing | 34 | 0
Greater Than 90 Days Past Due Accruing | 8 | 7
Total Past Due Accruing | 63 | 38
Non-Accrual | 36 | 33
Current | 4,130 | 5,246
Ending balance of loans | 4,229 | 5,317
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Abstract] |  |
31 - 60 Days Past Due Accruing | 1,009 | 1,162
61 - 90 Days Past Due Accruing | 406 | 265
Greater Than 90 Days Past Due Accruing | 61 | 671
Total Past Due Accruing | 1,476 | 2,098
Non-Accrual | 3,066 | 3,193
Current | 247,209 | 261,456
Ending balance of loans | $ 251,751 | $ 266,747

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