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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Change in Accumulated Other Comprehensive Income | The change in accumulated other comprehensive income (loss) for the year ended December 31, 2020 is summarized as follows, net of tax (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Gains | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | (Losses) for | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | AFS | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​
​ | ​ | Gains (Losses) | ​ | Securities | ​ | Change in Fair | ​ | Gains | ​ | ​ | ​
​ | ​ | on AFS | ​ | Transferred | ​ | Value of Cash | ​ | (Losses) | ​ | ​ | ​
​ | ​ | Securities | ​ | to HTM | ​ | Flow Hedges | ​ | on BOLI | ​ | Total
Balance - December 31, 2019 | ​ | $ | 37,877 | ​ | $ | 75 | ​ | $ | (782) | ​ | $ | (1,595) | ​ | $ | 35,575
Other comprehensive income (loss): | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Other comprehensive income (loss) before reclassification | ​ |  | 45,996 | ​ |  | — | ​ |  | (699) | ​ |  | (2,098) | ​ |  | 43,199
Amounts reclassified from AOCI into earnings | ​ |  | (9,712) | ​ |  | (20) | ​ |  | 1,481 | ​ |  | 492 | ​ |  | (7,759)
Net current period other comprehensive income (loss) | ​ |  | 36,284 | ​ |  | (20) | ​ |  | 782 | ​ |  | (1,606) | ​ |  | 35,440
Balance - December 31, 2020 | ​ | $ | 74,161 | ​ | $ | 55 | ​ | $ | — | ​ | $ | (3,201) | ​ | $ | 71,015
​ ​ The change in accumulated other comprehensive income (loss) for the year ended December 31, 2019 is summarized as follows, net of tax (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Gains | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | (Losses) for | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | AFS | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​
​ | ​ | Gains (Losses) | ​ | Securities | ​ | Change in Fair | ​ | Gains | ​ | ​ | ​
​ | ​ | on AFS | ​ | Transferred | ​ | Value of Cash | ​ | (Losses) on | ​ | ​ | ​
​ | ​ | Securities | ​ | to HTM | ​ | Flow Hedges | ​ | BOLI | ​ | Total
Balance - December 31, 2018 | ​ | $ | (5,949) | ​ | $ | 95 | ​ | $ | (3,393) | ​ | $ | (1,026) | ​ | $ | (10,273)
Other comprehensive income (loss): | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Other comprehensive income (loss) before reclassification | ​ |  | 49,890 | ​ |  | — | ​ |  | (5,103) | ​ |  | (646) | ​ |  | 44,141
Amounts reclassified from AOCI into earnings | ​ |  | (6,064) | ​ |  | (20) | ​ |  | 7,714 | ​ |  | 77 | ​ |  | 1,707
Net current period other comprehensive income (loss) | ​ |  | 43,826 | ​ |  | (20) | ​ |  | 2,611 | ​ |  | (569) | ​ |  | 45,848
Balance - December 31, 2019 | ​ | $ | 37,877 | ​ | $ | 75 | ​ | $ | (782) | ​ | $ | (1,595) | ​ | $ | 35,575
​ ​ The change in accumulated other comprehensive income (loss) for the year ended December 31, 2018 is summarized as follows, net of tax (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Gains | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | (Losses) for | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | AFS | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​
​ | ​ | Gains (Losses) | ​ | Securities | ​ | Change in Fair | ​ | Gains | ​ | ​ | ​
​ | ​ | on AFS | ​ | Transferred | ​ | Value of Cash | ​ | (Losses) | ​ | ​ | ​
​ | ​ | Securities | ​ | to HTM | ​ | Flow Hedges | ​ | on BOLI | ​ | Total
Balance - December 31, 2017 | ​ | $ | 1,874 | ​ | $ | 2,705 | ​ | $ | (4,361) | ​ | $ | (1,102) | ​ | $ | (884)
Transfer of HTM securities to AFS securities(1) | ​ |  | 2,785 | ​ |  | (2,785) | ​ |  | — | ​ |  | — | ​ |  | —
Cumulative effects from adoption of new accounting standards (2) (3) | ​ |  | 465 | ​ |  | 583 | ​ |  | (1,094) | ​ |  | — | ​ |  | (46)
Other comprehensive income (loss): | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Other comprehensive income (loss) before reclassification | ​ |  | (10,711) | ​ |  | — | ​ |  | 1,087 | ​ |  | — | ​ |  | (9,624)
Amounts reclassified from AOCI into earnings | ​ |  | (362) | ​ |  | (408) | ​ |  | 975 | ​ |  | 76 | ​ |  | 281
Net current period other comprehensive income (loss) | ​ |  | (11,073) | ​ |  | (408) | ​ |  | 2,062 | ​ |  | 76 | ​ |  | (9,343)
Balance - December 31, 2018 | ​ | $ | (5,949) | ​ | $ | 95 | ​ | $ | (3,393) | ​ | $ | (1,026) | ​ | $ | (10,273)
(1) | During the second quarter of 2018, the Company adopted ASU No. 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities". As part of this adoption, the Company made a one-time election to transfer eligible HTM securities to the AFS category. The transfer of these securities resulted in an increase of approximately $400,000 to AOCI and is included as unrealized gains (losses) on AFS securities above.
​
(2) | During the second quarter of 2018, the Company adopted ASU No. 2018-02 "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income." As part of this adoption, the Company reclassified approximately $107,000 of these amounts from AOCI to retained earnings.
​
(3) | During the first quarter of 2018, the Company adopted ASU No. 2016-01 "Financial Instruments - Overall (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities." As part of this adoption, the Company reclassified approximately $61,000 of these amounts from AOCI to retained earnings.

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