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Commitments and Contingencies - Allowance for Credit Losses for Unfunded Loan Commitments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Balance at beginning of period | $ 3,112 | $ 2,139 |
Impact of adopting ASU 2016-13 at January 1, 2020 | 3,112 | 3,112 | $ 3,113
Provision for credit losses | 6 | 973 |
Balance at end of period | 4,467 | 3,112 |
Impact of ASU 2016-13 Adoption |  |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Balance at beginning of period | 1,349 | 0 |
Impact of adopting ASU 2016-13 at January 1, 2020 | 1,349 | 0 | 1,349
Balance at end of period |  | 1,349 |
Adjusted Balance |  |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Balance at beginning of period | 4,461 | 2,139 |
Impact of adopting ASU 2016-13 at January 1, 2020 | $ 4,461 | 2,139 | $ 4,462
Balance at end of period |  | $ 4,461 |

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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82919202-210446 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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