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Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Estimated Fair Value |  |
Less Than 12 Months | $ 688,212 | $ 38,116
12 Months or More | 27,099 | 3,949
Total | 715,311 | 42,065
Unrealized Losses |  |
Less Than 12 Months | (11,044) | (143)
12 Months or More | (865) | (271)
Total | (11,909) | (414)
U.S. treasury securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 87,302 |
12 Months or More | 0 |
Total | 87,302 |
Unrealized Losses |  |
Less Than 12 Months | (1,087) |
12 Months or More | 0 |
Total | (1,087) |
U.S. agency |  |
Estimated Fair Value |  |
Less Than 12 Months | 10,969 |
12 Months or More | 0 |
Total | 10,969 |
Unrealized Losses |  |
Less Than 12 Months | (140) |
12 Months or More | 0 |
Total | (140) |
State, county and municipal securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 180,551 | 8,282
12 Months or More | 5,970 | 0
Total | 186,521 | 8,282
Unrealized Losses |  |
Less Than 12 Months | (3,131) | (65)
12 Months or More | (225) | 0
Total | (3,356) | (65)
Corporate debt securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 31,977 | 999
12 Months or More | 0 | 0
Total | 31,977 | 999
Unrealized Losses |  |
Less Than 12 Months | (265) | (1)
12 Months or More | 0 | 0
Total | (265) | (1)
Mortgage-backed securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 377,413 | 28,835
12 Months or More | 21,129 | 3,949
Total | 398,542 | 32,784
Unrealized Losses |  |
Less Than 12 Months | (6,421) | (77)
12 Months or More | (640) | (271)
Total | $ (7,061) | $ (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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- 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=123581744&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=124269663&loc=SL82922890-210455 + Details
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