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Securities Securities - Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Investment securities, continuous unrealized loss position [Abstract] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,946,549 | $ 407,150
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 21,578 | 4,277
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 317,275 | 464,283
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 11,808 | 13,560
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,263,824 | 871,433
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 33,386 | 17,837
US Treasury Securities |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 178,610 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 881 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 178,610 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 881 | 0
U.S. Government Agency Securities |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 365,833 | 9,962
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,024 | 38
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 54,266 | 6,091
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,974 | 22
Debt Securities, Available-for-sale, Unrealized Loss Position | 420,099 | 16,053
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4,998 | 60
Mortgage-backed Agency Securities |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 825,664 | 165,696
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11,859 | 1,772
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 178,956 | 35,997
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6,647 | 555
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,004,620 | 201,693
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 18,506 | 2,327
State and Municipal Securities |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 363,102 | 175,115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,665 | 2,220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 57,270 | 345,435
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,045 | 10,264
Debt Securities, Available-for-sale, Unrealized Loss Position | 420,372 | 520,550
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3,710 | 12,484
Asset-backed Securities |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 198,349 | 46,399
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,595 | 207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,513 | 52,840
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 190 | 450
Debt Securities, Available-for-sale, Unrealized Loss Position | 204,862 | 99,239
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2,785 | 657
Corporate Notes |  |
Investment securities, continuous unrealized loss position [Abstract] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 14,991 | 9,978
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 554 | 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 20,270 | 23,920
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,952 | 2,269
Debt Securities, Available-for-sale, Unrealized Loss Position | 35,261 | 33,898
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2,506 | $ 2,309

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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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- 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 less 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 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 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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