XML 14 R33.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | $ 37,191 | $ 38,493
Non-Accrual | 42,524 | 41,074
Current | 5,791,273 | 5,515,704
Ending balance of loans | 5,870,988 | 5,595,271
31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 28,390 | 27,402
61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 5,011 | 6,150
Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 3,790 | 4,941
Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Ending balance of loans | 2,602,385 | 2,473,702
Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Ending balance of loans | 2,091,408 | 2,005,980
Residential Real Estate Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Ending balance of loans | 1,177,195 | 1,115,589
Originated Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 35,016 | 35,505
Non-Accrual | 29,549 | 30,845
Current | 5,152,602 | 4,781,587
Ending balance of loans | 5,217,167 | 4,847,937
Originated Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 27,044 | 25,496
Originated Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 4,788 | 5,805
Originated Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 3,184 | 4,204
Originated Loans [Member] | Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 5,319 | 2,064
Non-Accrual | 13,847 | 13,431
Current | 2,278,012 | 2,124,876
Ending balance of loans | 2,297,178 | 2,140,371
Originated Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 5,074 | 1,010
Originated Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 245 | 970
Originated Loans [Member] | Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 84
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 2,150 | 735
Non-Accrual | 1,264 | 1,012
Current | 647,577 | 613,400
Ending balance of loans | 650,991 | 615,147
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 2,050 | 0
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 100 | 735
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 537 | 192
Non-Accrual | 6,236 | 4,127
Current | 1,176,523 | 1,064,549
Ending balance of loans | 1,183,296 | 1,068,868
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 537 | 192
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Non-Accrual | 900 | 817
Current | 32,486 | 32,130
Ending balance of loans | 33,386 | 32,947
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 557 | 19
Non-Accrual | 500 | 565
Current | 25,758 | 24,390
Ending balance of loans | 26,815 | 24,974
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 557 | 19
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 2,075 | 1,118
Non-Accrual | 4,947 | 6,910
Current | 395,668 | 390,407
Ending balance of loans | 402,690 | 398,435
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1,930 | 799
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 145 | 235
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 84
Originated Loans [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 26,052 | 29,188
Non-Accrual | 7,240 | 8,644
Current | 1,951,148 | 1,820,892
Ending balance of loans | 1,984,440 | 1,858,724
Originated Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 19,658 | 21,585
Originated Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 4,463 | 4,739
Originated Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1,931 | 2,864
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 19,688 | 21,579
Non-Accrual | 1,718 | 1,964
Current | 1,431,946 | 1,286,507
Ending balance of loans | 1,453,352 | 1,310,050
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 15,041 | 16,434
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 3,159 | 3,154
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1,488 | 1,991
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 5,680 | 6,840
Non-Accrual | 5,436 | 6,596
Current | 462,546 | 479,444
Ending balance of loans | 473,662 | 492,880
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 4,091 | 4,591
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1,205 | 1,428
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 384 | 821
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 684 | 769
Non-Accrual | 86 | 84
Current | 56,656 | 54,941
Ending balance of loans | 57,426 | 55,794
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 526 | 560
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 99 | 157
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 59 | 52
Originated Loans [Member] | Residential Real Estate Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 3,645 | 4,253
Non-Accrual | 8,462 | 8,770
Current | 923,442 | 835,819
Ending balance of loans | 935,549 | 848,842
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 2,312 | 2,901
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 80 | 96
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1,253 | 1,256
Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 2,175 | 2,988
Non-Accrual | 12,975 | 10,229
Current | 638,671 | 734,117
Ending balance of loans | 653,821 | 747,334
Acquired Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1,346 | 1,906
Acquired Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 223 | 345
Acquired Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 606 | 737
Acquired Loans [Member] | Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 94 | 20
Non-Accrual | 9,457 | 6,340
Current | 295,656 | 326,971
Ending balance of loans | 305,207 | 333,331
Acquired Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 63 | 5
Acquired Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 19 | 15
Acquired Loans [Member] | Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 12 | 0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Non-Accrual | 2,509 | 3,009
Current | 69,553 | 72,255
Ending balance of loans | 72,062 | 75,264
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Non-Accrual | 6,804 | 2,666
Current | 175,026 | 197,222
Ending balance of loans | 181,830 | 199,888
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 94 | 20
Non-Accrual | 144 | 665
Current | 51,077 | 57,494
Ending balance of loans | 51,315 | 58,179
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 63 | 5
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 19 | 15
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 12 | 0
Acquired Loans [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 598 | 870
Non-Accrual | 721 | 696
Current | 105,649 | 145,690
Ending balance of loans | 106,968 | 147,256
Acquired Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 420 | 739
Acquired Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 163 | 65
Acquired Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 15 | 66
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 303 | 577
Non-Accrual | 96 | 106
Current | 34,623 | 64,540
Ending balance of loans | 35,022 | 65,223
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 219 | 518
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 70 | 5
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 14 | 54
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 247 | 255
Non-Accrual | 591 | 557
Current | 67,064 | 75,904
Ending balance of loans | 67,902 | 76,716
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 177 | 190
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 70 | 60
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 5
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 48 | 38
Non-Accrual | 34 | 33
Current | 3,962 | 5,246
Ending balance of loans | 4,044 | 5,317
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 24 | 31
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 23 | 0
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1 | 7
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1,483 | 2,098
Non-Accrual | 2,797 | 3,193
Current | 237,366 | 261,456
Ending balance of loans | 241,646 | 266,747
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 863 | 1,162
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 41 | 265
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | $ 579 | $ 671

X
- References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 + Details
Name: | us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=nbtb_FinancingReceivables31To60DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=nbtb_FinancingReceivables61To90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | nbtb_ClassOfFinancingReceivablesAxis=nbtb_OriginatedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_CommercialFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_AgriculturalFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_AgriculturalRealEstateFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_SmallBusinessFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_IndirectFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_HomeEquityFinancingReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_DirectFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | nbtb_ClassOfFinancingReceivablesAxis=nbtb_AcquiredLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |