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v3.20.4

Parent Company Financial Information, Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities [Abstract] |  |  |
Net income | $ 104,388 | $ 121,021 | $ 112,566
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation and amortization of premises and equipment | 9,772 | 9,497 | 9,280
Excess tax benefit on stock-based compensation | (181) | (409) | (543)
Stock-based compensation expense | 4,581 | 4,210 | 3,936
Net securities losses (gains) | 388 | (4,213) | 6,341
Bank owned life insurance income | (5,743) | (5,355) | (5,091)
Amortization of subordinated debt issuance costs | 230 | 0 | 0
Net change in other assets and other liabilities | (49,930) | (6,774) | (9,554)
Net cash provided by operating activities | 142,412 | 153,463 | 147,773
Investing activities [Abstract] |  |  |
Proceeds on sales of equity securities | 0 | 3,966 | 3,318
Purchases of equity securities | 0 | (93) | (2)
Net cash used in investing activities | (709,725) | (64,343) | (417,619)
Financing activities [Abstract] |  |  |
Proceeds from issuance of subordinated debt | 100,000 | 0 | 0
Payment of subordinated debt issuance costs | (2,178) | 0 | 0
Proceeds from the issuance of shares to employee and other stock plans | 184 | 725 | 1,296
Cash paid by employer for tax-withholding on stock issuance | (1,537) | (1,622) | (1,893)
Purchases of treasury shares | (7,980) | 0 | 0
Cash dividends | (47,207) | (46,010) | (43,269)
Net cash provided by (used in) financing activities | 1,023,151 | (53,232) | 291,137
Net increase in cash and cash equivalents | 455,838 | 35,888 | 21,291
Cash and cash equivalents at beginning of year | 216,843 | 180,955 | 159,664
Cash and cash equivalents at end of year | 672,681 | 216,843 | 180,955
NBT Bancorp Inc [Member] |  |  |
Operating activities [Abstract] |  |  |
Net income | 104,388 | 121,021 | 112,566
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation and amortization of premises and equipment | 1,739 | 2,298 | 2,814
Excess tax benefit on stock-based compensation | (181) | (409) | (543)
Stock-based compensation expense | 4,581 | 4,210 | 3,936
Net securities losses (gains) | 483 | (165) | (399)
Equity in undistributed income of subsidiaries | (32,068) | (74,473) | (72,973)
Bank owned life insurance income | (391) | (398) | (424)
Amortization of subordinated debt issuance costs | 230 | 0 | 0
Net change in other assets and other liabilities | (3,535) | (1,573) | (6,124)
Net cash provided by operating activities | 75,246 | 50,511 | 38,853
Investing activities [Abstract] |  |  |
Investment in the Bank | (90,000) | 0 | 0
Proceeds from calls of equity securities | 2,000 | 0 | 0
Proceeds on sales of equity securities | 0 | 0 | 3,318
Purchases of equity securities | 0 | (93) | (2)
Net cash used in investing activities | (88,000) | (93) | 3,316
Financing activities [Abstract] |  |  |
Proceeds from issuance of subordinated debt | 100,000 | 0 | 0
Payment of subordinated debt issuance costs | (2,178) | 0 | 0
Proceeds from the issuance of shares to employee and other stock plans | 184 | 725 | 1,296
Cash paid by employer for tax-withholding on stock issuance | (1,537) | (1,622) | (1,893)
Purchases of treasury shares | (7,980) | 0 | 0
Cash dividends | (47,207) | (46,010) | (43,269)
Net cash provided by (used in) financing activities | 41,282 | (46,907) | (43,866)
Net increase in cash and cash equivalents | 28,528 | 3,511 | (1,697)
Cash and cash equivalents at beginning of year | 9,387 | 5,876 | 7,572
Cash and cash equivalents at end of year | $ 37,915 | $ 9,387 | $ 5,876

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- Definition Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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