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Other Derivatives - Designated Cash flow hedges (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net unrealized gain (loss) on derivatives | $ (2,049) | $ (2,731) | $ 2,033
Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net unrealized gain (loss) on derivatives | (1,146) | 1,165 |
Interest Expense | Cash Flow Hedge |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net unrealized gain (loss) on derivatives | (1,146) | 1,165 |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring | 0 | 0 |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income - Included Component | $ (1,146) | 1,165 |
Gain on sale of investment securities |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net unrealized gain (loss) on derivatives |  | 829 |
Gain on sale of investment securities | Cash Flow Hedge |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net unrealized gain (loss) on derivatives |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring |  | 829 |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income - Included Component |  | $ 829 |

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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121577181&loc=SL110061190-113977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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