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Investment Securities - Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | $ 21,668 | $ 145,676
Unrealized Losses, Less than 12 Months | (256) | (558)
Fair Value, 12 Months or Longer | 37,362 | 107,451
Unrealized Losses, 12 Months or Longer | (297) | (950)
Fair Value, Total | 59,030 | 253,127
Unrealized Losses, Total | (553) | (1,508)
U.S. government and agency securities |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months |  | 45,999
Unrealized Losses, Less than 12 Months |  | (84)
Fair Value, 12 Months or Longer |  | 0
Unrealized Losses, 12 Months or Longer |  | 0
Fair Value, Total |  | 45,999
Unrealized Losses, Total |  | (84)
Municipal securities |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | 10,264 | 13,761
Unrealized Losses, Less than 12 Months | (227) | (102)
Fair Value, 12 Months or Longer | 0 | 0
Unrealized Losses, 12 Months or Longer | 0 | 0
Fair Value, Total | 10,264 | 13,761
Unrealized Losses, Total | (227) | (102)
Residential mortgage-backed securities |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | 0 | 14,272
Unrealized Losses, Less than 12 Months | 0 | (66)
Fair Value, 12 Months or Longer | 25,293 | 60,232
Unrealized Losses, 12 Months or Longer | (209) | (439)
Fair Value, Total | 25,293 | 74,504
Unrealized Losses, Total | (209) | (505)
Commercial mortgage-backed securities |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | 11,404 | 56,263
Unrealized Losses, Less than 12 Months | (29) | (177)
Fair Value, 12 Months or Longer | 7,499 | 43,623
Unrealized Losses, 12 Months or Longer | (61) | (472)
Fair Value, Total | 18,903 | 99,886
Unrealized Losses, Total | (90) | (649)
Other asset-backed securities |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months |  | 998
Unrealized Losses, Less than 12 Months |  | (2)
Fair Value, 12 Months or Longer |  | 1,987
Unrealized Losses, 12 Months or Longer |  | (13)
Fair Value, Total |  | 2,985
Unrealized Losses, Total |  | (15)
Other Security Investments |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | 0 | 14,383
Unrealized Losses, Less than 12 Months | 0 | (127)
Fair Value, 12 Months or Longer | 4,570 | 1,609
Unrealized Losses, 12 Months or Longer | (27) | (26)
Fair Value, Total | 4,570 | 15,992
Unrealized Losses, Total | $ (27) | $ (153)

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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=121582814&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=121645371&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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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, 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 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: 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=121582814&loc=SL82922890-210455 + Details
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