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Loans and Allowance for Loan Losses - Loans Modified and Classified as TDR (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Number | 2 | 3 | 1
Balance | $ 7,853 | $ 951 | $ 1,620
Principal amount forgiven | $ 0 |  |
Empire |  |  |
Number | loan | 7 |  |
Balance | $ 3,500 |  |
One-To-Four Family - Mixed Used Property [Member] |  |  |
Number | 1 |  |
Balance | $ 270 |  |
Commercial Real Estate |  |  |
Number | 1 |  |
Balance | $ 7,583 |  |
Commercial Business and Other [Member] | Extended Maturity [Member] |  |  |
Number |  | 3 | 1
Balance |  | $ 951 | $ 1,620

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
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