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Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 527,519 | $ 38,116
12 Months or Greater | 16,313 | 3,949
Total | 543,832 | 42,065
Gross Unrealized Losses |  |
Less Than 12 Months | (8,946) | (143)
12 Months or Greater | (304) | (271)
Total | (9,250) | (414)
U.S. treasury securities |  |
Fair Value |  |
Less Than 12 Months | 42,382 |
12 Months or Greater | 0 |
Total | 42,382 |
Gross Unrealized Losses |  |
Less Than 12 Months | (652) |
12 Months or Greater | 0 |
Total | (652) |
U.S. agency |  |
Fair Value |  |
Less Than 12 Months | 8,473 |
12 Months or Greater | 0 |
Total | 8,473 |
Gross Unrealized Losses |  |
Less Than 12 Months | (165) |
12 Months or Greater | 0 |
Total | (165) |
State, county & municipal securities |  |
Fair Value |  |
Less Than 12 Months | 158,260 | 8,282
12 Months or Greater | 2,476 | 0
Total | 160,736 | 8,282
Gross Unrealized Losses |  |
Less Than 12 Months | (3,446) | (65)
12 Months or Greater | (74) | 0
Total | (3,520) | (65)
Corporate debt securities |  |
Fair Value |  |
Less Than 12 Months | 18,711 | 999
12 Months or Greater | 0 | 0
Total | 18,711 | 999
Gross Unrealized Losses |  |
Less Than 12 Months | (163) | (1)
12 Months or Greater | 0 | 0
Total | (163) | (1)
Mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 299,693 | 28,835
12 Months or Greater | 13,837 | 3,949
Total | 313,530 | 32,784
Gross Unrealized Losses |  |
Less Than 12 Months | (4,520) | (77)
12 Months or Greater | (230) | (271)
Total | $ (4,750) | $ (348)

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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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