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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity [Abstract] |
Stockholders' Equity | 14. Stockholders’ Equity In accordance with GAAP, unrecognized prior service costs and net actuarial gains or losses associated with the Company’s pension and postretirement benefit plans and unrealized gains on derivatives and on AFS securities are included in AOCI, net of tax. For the years ended December 31, components of AOCI are:
(In thousands) |  | 2020 |  |  | 2019 |  |  | 2018 |
Unrecognized prior service cost and net actuarial (losses) on pension plans |  | $ | (20,134 | ) |  | $ | (21,677 | ) |  | $ | (27,689 | )
Unrealized (losses) gains on derivatives (cash flow hedges) |  |  | (16 | ) |  |  | (32 | ) |  |  | 1,821 |
Unrealized net holding gains (losses) on AFS securities |  |  | 20,567 |  |  |  | 2,683 |  |  |  | (17,306 | )
AOCI |  | $ | 417 |  |  | $ | (19,026 | ) |  | $ | (43,174 | )
Certain restrictions exist regarding the ability of the subsidiary bank to transfer funds to the Company in the form of cash dividends. The approval of the OCC is required to pay dividends when a bank fails to meet certain minimum regulatory capital standards or when such dividends are in excess of a subsidiary bank’s earnings retained in the current year plus retained net profits for the preceding two years as specified in applicable OCC regulations. At December 31, 2020, approximately $194.2 million of the total stockholders’ equity of the Bank was available for payment of dividends to the Company without approval by the OCC. The Bank’s ability to pay dividends also is subject to the Bank being in compliance with regulatory capital requirements. The Bank is currently in compliance with these requirements. Under the State of Delaware General Corporation Law, the Company may declare and pay dividends either out of accumulated net retained earnings or capital surplus. The Company purchased 263,507 shares of its common stock during the year ended December 31, 2020, for a total of $8.0 million at an average price of $30.28 per share under its previously announced plan. As of December 31, 2020, there were 736,493 shares available for repurchase under this plan, which expires on December 31, 2021. On January 27, 2021, the NBT Board of Directors approved an increase to the total number of shares authorized under the stock repurchase program to 2 million shares from 1 million shares, previously.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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