XML 45 R34.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | $ 29,880 | $ 36,724
Non-Accrual | 38,944 | 33,744
Current | 5,898,985 | 5,812,665
Recorded Total Loans | 5,967,809 | 5,883,133
31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 22,263 | 26,957
61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 5,432 | 6,105
Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 2,185 | 3,662
Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Recorded Total Loans | 2,617,111 | 2,589,707
Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Recorded Total Loans | 2,138,877 | 2,096,646
Residential Real Estate Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Recorded Total Loans | 1,211,821 | 1,196,780
Originated Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 27,365 | 33,664
Non-Accrual | 34,149 | 28,936
Current | 5,315,373 | 5,209,019
Recorded Total Loans | 5,376,887 | 5,271,619
Originated Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 20,434 | 24,680
Originated Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 4,830 | 5,649
Originated Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 2,101 | 3,335
Originated Loans [Member] | Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 3,184 | 2,276
Non-Accrual | 21,722 | 14,553
Current | 2,312,575 | 2,287,149
Recorded Total Loans | 2,337,481 | 2,303,978
Originated Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 2,483 | 1,827
Originated Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 701 | 449
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 | 0
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 616 | 805
Non-Accrual | 2,903 | 2,817
Current | 652,992 | 640,696
Recorded Total Loans | 656,511 | 644,318
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 | 616 | 782
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 | 0 | 23
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 | 734 | 71
Non-Accrual | 13,207 | 5,546
Current | 1,202,805 | 1,189,280
Recorded Total Loans | 1,216,746 | 1,194,897
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 | 73 | 39
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 | 661 | 32
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 | 94
Non-Accrual | 952 | 897
Current | 33,431 | 33,633
Recorded Total Loans | 34,383 | 34,624
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 | 94
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 | 0 | 0
Non-Accrual | 479 | 1,046
Current | 29,440 | 28,172
Recorded Total Loans | 29,919 | 29,218
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 | 0 | 0
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 | 1,834 | 1,306
Non-Accrual | 4,181 | 4,247
Current | 393,907 | 395,368
Recorded Total Loans | 399,922 | 400,921
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 | 1,794 | 912
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 | 40 | 394
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 | 0
Originated Loans [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 21,032 | 27,026
Non-Accrual | 5,435 | 6,670
Current | 2,026,101 | 1,967,523
Recorded Total Loans | 2,052,568 | 2,001,219
Originated Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 15,756 | 19,552
Originated Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 3,336 | 4,835
Originated Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1,940 | 2,639
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 16,539 | 20,965
Non-Accrual | 1,582 | 1,786
Current | 1,518,228 | 1,454,499
Recorded Total Loans | 1,536,349 | 1,477,250
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 | 12,305 | 15,731
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 | 2,600 | 2,963
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 | 1,634 | 2,271
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 3,942 | 5,407
Non-Accrual | 3,743 | 4,835
Current | 449,595 | 454,473
Recorded Total Loans | 457,280 | 464,715
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 | 3,083 | 3,396
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 | 618 | 1,671
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 | 241 | 340
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 551 | 654
Non-Accrual | 110 | 49
Current | 58,278 | 58,551
Recorded Total Loans | 58,939 | 59,254
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 | 368 | 425
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 | 118 | 201
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 | 65 | 28
Originated Loans [Member] | Residential Real Estate Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 3,149 | 4,362
Non-Accrual | 6,992 | 7,713
Current | 976,697 | 954,347
Recorded Total Loans | 986,838 | 966,422
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 | 2,195 | 3,301
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 | 793 | 365
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 | 161 | 696
Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 2,515 | 3,060
Non-Accrual | 4,795 | 4,808
Current | 583,612 | 603,646
Recorded Total Loans | 590,922 | 611,514
Acquired Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1,829 | 2,277
Acquired Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 602 | 456
Acquired Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 84 | 327
Acquired Loans [Member] | Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 463 | 288
Non-Accrual | 1,730 | 1,620
Current | 277,437 | 283,821
Recorded Total Loans | 279,630 | 285,729
Acquired Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 463 | 288
Acquired Loans [Member] | Commercial Loans [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] | 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 [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 0 | 0
Non-Accrual | 0 | 0
Current | 65,412 | 68,991
Recorded Total Loans | 65,412 | 68,991
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 | 1,314 | 1,313
Current | 167,131 | 165,630
Recorded Total Loans | 168,445 | 166,943
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 | 463 | 288
Non-Accrual | 416 | 307
Current | 44,894 | 49,200
Recorded Total Loans | 45,773 | 49,795
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 | 463 | 288
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 | 0 | 0
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 | 0 | 0
Acquired Loans [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 489 | 710
Non-Accrual | 484 | 604
Current | 85,336 | 94,113
Recorded Total Loans | 86,309 | 95,427
Acquired Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 444 | 546
Acquired Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 34 | 163
Acquired Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 11 | 1
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 79 | 155
Non-Accrual | 79 | 104
Current | 21,689 | 27,516
Recorded Total Loans | 21,847 | 27,775
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 | 71 | 143
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 | 7 | 11
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 | 1 | 1
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 389 | 459
Non-Accrual | 340 | 457
Current | 60,199 | 62,811
Recorded Total Loans | 60,928 | 63,727
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 | 359 | 327
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 | 20 | 132
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 | 10 | 0
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 21 | 96
Non-Accrual | 65 | 43
Current | 3,448 | 3,786
Recorded Total Loans | 3,534 | 3,925
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 | 14 | 76
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 | 7 | 20
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 | 0 | 0
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due Accruing | 1,563 | 2,062
Non-Accrual | 2,581 | 2,584
Current | 220,839 | 225,712
Recorded Total Loans | 224,983 | 230,358
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 | 922 | 1,443
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 | 568 | 293
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 | $ 73 | $ 326

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=nbtb_FinancingReceivablesGreaterThan90DaysPastDueMember
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: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=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: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=nbtb_AcquiredLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |