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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Changes in AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Balance at beginning of period | $ 3,911 |  |  |
Total other comprehensive income (loss) | 7,105 | $ 15,713 | $ (6,268) |
Balance at end of period | 3,911 |  |  | $ 11,016
Net unrealized gain (loss) on AFS securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Balance at beginning of period | 5,547 | (8,665) | (1,713) |
Other comprehensive gain (loss) before reclassifications | 8,628 | 14,394 | (7,293) |
Less: amounts reclassified from accumulated other comprehensive income | 4,154 | 182 | (708) |
Total other comprehensive income (loss) | 4,474 | 14,212 | (6,585) |
Balance at end of period | 5,547 | (8,665) | (1,713) | 10,021
Net unrealized gain (loss) on effective cash flow hedging derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Balance at beginning of period | (479) | (2,249) | (2,250) |
Other comprehensive gain (loss) before reclassifications | (1,043) | (649) | 486 |
Less: amounts reclassified from accumulated other comprehensive income | (3,935) | (2,419) |  |
Total other comprehensive income (loss) | 2,892 | 1,770 | 486 |
Balance at end of period | (479) | (2,249) | (2,250) | 2,413
Net unrealized gain (loss) on post-retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Balance at beginning of period | (1,157) | (888) | (591) |
Other comprehensive gain (loss) before reclassifications | (261) | (269) | (191) |
Less: amounts reclassified from accumulated other comprehensive income |  |  | (22) |
Total other comprehensive income (loss) | (261) | (269) | (169) |
Balance at end of period | (1,157) | (888) | (591) | (1,418)
Accumulated other comprehensive income (loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Balance at beginning of period | 3,911 | (11,802) | (4,554) |
Other comprehensive gain (loss) before reclassifications | 7,324 | 13,476 | (6,998) |
Less: amounts reclassified from accumulated other comprehensive income | 219 | (2,237) | (730) |
Total other comprehensive income (loss) | 7,105 | 15,713 | (6,268) |
Balance at end of period | $ 3,911 | $ (11,802) | (4,554) | $ 11,016
Accounting Standards Update 2018-02 | Net unrealized gain (loss) on AFS securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Less: amounts reclassified from accumulated other comprehensive income |  |  | (367) |
Accounting Standards Update 2018-02 | Net unrealized gain (loss) on effective cash flow hedging derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Less: amounts reclassified from accumulated other comprehensive income |  |  | (485) |
Accounting Standards Update 2018-02 | Net unrealized gain (loss) on post-retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Less: amounts reclassified from accumulated other comprehensive income |  |  | (128) |
Accounting Standards Update 2018-02 | Accumulated other comprehensive income (loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Less: amounts reclassified from accumulated other comprehensive income |  |  | $ (980) |

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