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Derivatives (Tables) | 3 Months Ended
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Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Fair Value Hedge Relationships in Balance Sheet | A summary of the Company’s fair value hedge relationships for the periods presented are as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | ​ |  | ​ |  | ​ | ​ |  | ​ |
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | Balance | ​ | Remaining | ​ | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | Sheet | ​ | Maturity | ​ | Average | ​ | Receive | ​ | Notional | ​ | Estimated
Liability derivatives | ​ | Location | ​ | (In Years) | ​ | Pay Rate | ​ | Rate | ​ | Amount | ​ | Fair Value
March 31, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate swap agreements - securities |  | Other liabilities |  | 6.18 |  | 3.09 | % | 3 month LIBOR | ​ | $ | 36,000 |  | $ | (4,008)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​
December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate swap agreements - securities |  | Other liabilities |  | 7.13 |  | 3.08 | % | 3 month LIBOR | ​ | $ | 36,000 | ​ | $ | (6,174)
Schedule of Fair Value Hedge Relationships on Income Statement | The effects of the Company’s fair value hedge relationships reported in interest income on tax-exempt available-for-sale securities on the consolidated income statement were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
​ | ​ | 2021 | ​ | 2020
Interest income on tax-exempt securities | ​ | $ | 564 | ​ | $ | 440
Effects of fair value hedge relationships | ​ |  | (305) | ​ |  | (157)
Reported interest income on tax-exempt securities | ​ | $ | 259 | ​ | $ | 283
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
Gain (loss) on fair value hedging relationship | ​ | 2021 | ​ | 2020
Interest rate swap agreements - securities: | ​ |  |  | ​ | ​ |
Hedged items | ​ | $ | (4,008) | ​ | $ | (6,885)
Derivative designated as hedging instruments | ​ | $ | 4,008 | ​ | $ | 6,885
​
Schedule of Fair Value Hedges | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | Cumulative Amount of Fair
​ | ​ | ​ | ​ | ​ | Value Hedging Adjustment
​ | ​ | Carrying Amount | ​ | Included in Other Comprehensive
Line item on the balance sheet |  | of the Hedged Assets |  | Income
March 31, 2021: |  |  |  | ​ | ​ |
Securities available-for-sale |  | $ | 43,073 | ​ | $ | 250
December 31, 2020: | ​ |  |  | ​ |  |
Securities available-for-sale | ​ | $ | 44,017 | ​ | $ | (1,063)

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure for fair value hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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