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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 6 Months Ended
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Jun. 30, 2019
Stockholders' Equity Note [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income | The following tables summarize the changes within each classification of accumulated other comprehensive income (loss) net of tax for the three months ended June 30, 2019 and 2018: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unrealized |  | ​ |  |  | ​ |
​ |  | Gains and |  | Defined | ​ | ​ | ​
​ |  | (Losses) on |  | Benefit | ​ | ​ | ​
​ |  | Available- |  | Pension | ​ | ​ | ​
​ |  | for-Sales |  | Gains | ​ | ​ | ​
(dollars in thousands) |  | Securities |  | (Losses) |  | Total
Balance at April 1, 2019 | ​ | $ | 3,843 | ​ | $ | (1,356) | ​ | $ | 2,487
Other comprehensive income before reclassification | ​ |  | 7,040 | ​ |  | 0 | ​ |  | 7,040
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | (65) | ​ |  | 38 | ​ |  | (27)
Net current period other comprehensive income | ​ |  | 6,975 | ​ |  | 38 | ​ |  | 7,013
Balance at June 30, 2019 | ​ | $ | 10,818 | ​ | $ | (1,318) | ​ | $ | 9,500
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unrealized |  | ​ |  |  | ​ |
​ |  | Gains and |  | Defined | ​ | ​ | ​
​ |  | (Losses) on |  | Benefit | ​ | ​ | ​
​ |  | Available- |  | Pension | ​ | ​ | ​
​ |  | for-Sales |  | Gains | ​ | ​ | ​
(dollars in thousands) |  | Securities |  | (Losses) |  | Total
Balance at April 1, 2018 | ​ | $ | (6,270) | ​ | $ | (1,718) | ​ | $ | (7,988)
Other comprehensive income before reclassification | ​ |  | (1,771) | ​ |  | 0 | ​ |  | (1,771)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 0 | ​ |  | 49 | ​ |  | 49
Net current period other comprehensive income | ​ |  | (1,771) | ​ |  | 49 | ​ |  | (1,722)
Balance at June 30, 2018 | ​ | $ | (8,041) | ​ | $ | (1,669) | ​ | $ | (9,710)
​ The following tables summarize the changes within each classification of accumulated other comprehensive income (loss) net of tax for the six months ended June 30, 2019 and 2018:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gains and | ​ | Defined | ​ | ​ | ​
​ | ​ | (Losses) on | ​ | Benefit | ​ | ​ | ​
​ | ​ | Available- | ​ | Pension | ​ | ​ | ​
​ | ​ | for-Sales | ​ | Gains | ​ | ​ | ​
(dollars in thousands) |  | Securities |  | (Losses) |  | Total
Balance at January 1, 2019 | ​ | $ | (4,796) | ​ | $ | (1,395) | ​ | $ | (6,191)
Other comprehensive income before reclassification | ​ | ​ | 15,702 | ​ | ​ | 0 | ​ | ​ | 15,702
Amounts reclassified from accumulated other comprehensive income (loss) | ​ | ​ | (88) | ​ | ​ | 77 | ​ | ​ | (11)
Net current period other comprehensive income | ​ | ​ | 15,614 | ​ | ​ | 77 | ​ | ​ | 15,691
Balance at June 30, 2019 | ​ | $ | 10,818 | ​ | $ | (1,318) | ​ | $ | 9,500
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gains and | ​ | Defined | ​ | ​ | ​
​ | ​ | (Losses) on | ​ | Benefit | ​ | ​ | ​
​ | ​ | Available- | ​ | Pension | ​ | ​ | ​
​ | ​ | for-Sales | ​ | Gains | ​ | ​ | ​
(dollars in thousands) |  | Securities |  | (Losses) |  | Total
Balance at January 1, 2018 | ​ | $ | 784 | ​ | $ | (1,454) | ​ | $ | (670)
Other comprehensive income before reclassification | ​ | ​ | (8,903) | ​ | ​ | 0 | ​ | ​ | (8,903)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ | ​ | 6 | ​ | ​ | 98 | ​ | ​ | 104
Net current period other comprehensive income | ​ | ​ | (8,897) | ​ | ​ | 98 | ​ | ​ | (8,799)
Adoption of ASU 2018‑02 | ​ | ​ | 140 | ​ | ​ | (313) | ​ | ​ | (173)
Adoption of ASU 2016‑01 | ​ | ​ | (68) | ​ | ​ | 0 | ​ | ​ | (68)
Balance at June 30, 2018 | ​ | $ | (8,041) | ​ | $ | (1,669) | ​ | $ | (9,710)
​
Reclassification Accumulated Other Comprehensive Income | Reclassifications out of accumulated comprehensive income for the three months ended June 30, 2019 are as follows:
​ | ​ | ​ | ​ | ​ | ​
Details about | ​ | Amount | ​ | Affected Line Item
Accumulated Other | ​ | Reclassified From | ​ | in the Statement
Comprehensive | ​ | Accumulated Other | ​ | Where Net
Income Components |  | Comprehensive Income |  | Income is Presented
​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) | ​ | ​ | ​ | ​ | ​
Unrealized gains and losses on available-for-sale securities | ​ | $ | 65 | ​ | Net securities gains (losses)
Tax effect | ​ | ​ | 0 | ​ | Income tax expense
Subtotal | ​ | ​ | 65 | ​ | Net of tax
Amortization of defined benefit pension items | ​ | ​ | (53) | ​ | Other expense
Tax effect | ​ | ​ | 15 | ​ | Income tax expense
Subtotal | ​ | ​ | (38) | ​ | Net of tax
Total reclassifications for the period | ​ | $ | 27 | ​ | Net income
​ Reclassifications out of accumulated comprehensive income for the three months ended June 30, 2018 are as follows:
​ | ​ | ​ | ​ | ​ | ​
Details about | ​ | Amount | ​ | Affected Line Item
Accumulated Other | ​ | Reclassified From | ​ | in the Statement
Comprehensive | ​ | Accumulated Other | ​ | Where Net
Income Components |  | Comprehensive Income |  | Income is Presented
​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) | ​ | ​ | ​ | ​ | ​
Unrealized gains and losses on available-for-sale securities | ​ | $ | 0 | ​ | Net securities gains (losses)
Tax effect | ​ | ​ | 0 | ​ | Income tax expense
Subtotal | ​ | ​ | 0 | ​ | Net of tax
Amortization of defined benefit pension items | ​ | ​ | (67) | ​ | Other expense
Tax effect | ​ | ​ | 18 | ​ | Income tax expense
Subtotal | ​ | ​ | (49) | ​ | Net of tax
Total reclassifications for the period | ​ | $ | (49) | ​ | Net income
​ Reclassifications out of accumulated comprehensive income for the six months ended June 30, 2019 are as follows:
​ | ​ | ​ | ​ | ​ | ​
Details about | ​ | Amount | ​ | Affected Line Item
Accumulated Other | ​ | Reclassified From | ​ | in the Statement
Comprehensive | ​ | Accumulated Other | ​ | Where Net
Income Components |  | Comprehensive Income |  | Income is Presented
​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) | ​ | ​ | ​ | ​ | ​
Unrealized gains and losses on available-for-sale securities | ​ | $ | 88 | ​ | Net securities gains (losses)
Tax effect | ​ | ​ | 0 | ​ | Income tax expense
Subtotal | ​ | ​ | 88 | ​ | Net of tax
Amortization of defined benefit pension items | ​ | ​ | (103) | ​ | Other expense
Tax effect | ​ | ​ | 26 | ​ | Income tax expense
Subtotal | ​ | ​ | (77) | ​ | Net of tax
Total reclassifications for the period | ​ | $ | 11 | ​ | Net income
​ Reclassifications out of accumulated comprehensive income for the six months ended June 30, 2018 are as follows:
​ | ​ | ​ | ​ | ​ | ​
Details about | ​ | Amount | ​ | Affected Line Item
Accumulated Other | ​ | Reclassified From | ​ | in the Statement
Comprehensive | ​ | Accumulated Other | ​ | Where Net
Income Components |  | Comprehensive Income |  | Income is Presented
​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) | ​ | ​ | ​ | ​ | ​
Unrealized gains and losses on available-for-sale securities | ​ | $ | (6) | ​ | Net securities gains (losses)
Tax effect | ​ | ​ | 0 | ​ | Income tax expense
Subtotal | ​ | ​ | (6) | ​ | Net of tax
Amortization of defined benefit pension items | ​ | ​ | (133) | ​ | Other expense
Tax effect | ​ | ​ | 35 | ​ | Income tax expense
Subtotal | ​ | ​ | (98) | ​ | Net of tax
Total reclassifications for the period | ​ | $ | (104) | ​ | Net income
​

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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