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Securities - Information pertaining to securities with gross unrealized losses2 (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | $ 40,682 | $ 15,243
Less than 12 Months, Unrealized Losses | 566 | 100
12 Months or Longer, Fair Value | 3,609 | 1,649
12 Months or Longer, Unrealized Losses | 53 | 23
Total, Fair Value | 44,291 | 16,892
Total, Unrealized Losses | 619 | 123
U.S. government agency obligations |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 2,383 | 1,284
Less than 12 Months, Unrealized Losses | 23 | 17
12 Months or Longer, Fair Value | 1,154 |
12 Months or Longer, Unrealized Losses | 16 |
Total, Fair Value | 3,537 | 1,284
Total, Unrealized Losses | 39 | 17
Municipal obligations |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
12 Months or Longer, Fair Value | 242 | 238
12 Months or Longer, Unrealized Losses | 12 | 18
Total, Fair Value | 242 | 238
Total, Unrealized Losses | 12 | 18
Mortgage-backed residential obligations |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 19,537 | 5,265
Less than 12 Months, Unrealized Losses | 284 | 17
12 Months or Longer, Fair Value | 2,213 | 1,170
12 Months or Longer, Unrealized Losses | 25 | 5
Total, Fair Value | 21,750 | 6,435
Total, Unrealized Losses | 309 | 22
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 18,762 | 8,694
Less than 12 Months, Unrealized Losses | 259 | 66
12 Months or Longer, Fair Value |  | 241
Total, Fair Value | 18,762 | 8,935
Total, Unrealized Losses | $ 259 | $ 66

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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