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Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands | Common Stock [Member] | Additional Paid-in-Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | Common Stock in Treasury [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ 380 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 317,329 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 329,981 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (6,104)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (103,476)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 538,110 us-gaap_StockholdersEquity
Net income | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 54,558 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 54,558 us-gaap_NetIncomeLoss
Cash dividends | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (26,712)us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (26,712)us-gaap_DividendsCash
Purchases of treasury shares | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (15,490)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (15,490)us-gaap_TreasuryStockValueAcquiredCostMethod
Net issuance of shares for acquisition | 13 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 25,811 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 25,824 us-gaap_StockIssuedDuringPeriodValueAcquisitions
Net issuance of shares to employee stock plans, including tax benefit | 0 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (812)nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (269)nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 2,476 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 1,395 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans
Stock-based compensation | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,364 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 4,364 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Other comprehensive income | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 224 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 224 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Ending Balance at Dec. 31, 2012 | 393 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 346,692 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 357,558 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (5,880)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (116,490)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 582,273 us-gaap_StockholdersEquity
Net income | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 61,747 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 61,747 us-gaap_NetIncomeLoss
Cash dividends | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (33,518)us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (33,518)us-gaap_DividendsCash
Purchases of treasury shares | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (12,459)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (12,459)us-gaap_TreasuryStockValueAcquiredCostMethod
Net issuance of shares for acquisition | 104 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 225,447 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (5,779)us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 219,772 us-gaap_StockIssuedDuringPeriodValueAcquisitions
Net issuance of shares to employee stock plans, including tax benefit | 0 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (2,292)nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 7,626 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 5,334 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans
Stock-based compensation | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,305 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 4,305 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Other comprehensive income | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (10,885)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (10,885)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Ending Balance at Dec. 31, 2013 | 497 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 574,152 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 385,787 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (16,765)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (127,102)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 816,569 us-gaap_StockholdersEquity
Net income | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 75,074 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 75,074 us-gaap_NetIncomeLoss
Cash dividends | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (36,905)us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (36,905)us-gaap_DividendsCash
Purchases of treasury shares | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (72)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (72)us-gaap_TreasuryStockValueAcquiredCostMethod
Net issuance of shares to employee stock plans, including tax benefit | 0 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,169)nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 7,425 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 6,256 nbtb_StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans
Stock-based compensation | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,521 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 3,521 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Other comprehensive income | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (262)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (262)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Ending Balance at Dec. 31, 2014 | $ 497 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 576,504 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 423,956 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (17,027)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (119,749)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 864,181 us-gaap_StockholdersEquity

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