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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 61.00% | 16.20%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 920,980 | $ 87,261
12 months or more | 21,402 | 75,247
Total | 942,382 | 162,508
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (11,746) | (375)
12 months or more | (124) | (411)
Total | (11,870) | (786)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 909,234 | 86,886
12 months or more | 21,278 | 74,836
Total | 930,512 | 161,722
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 206,535 | 5,604
12 months or more | 15,963 | 46,163
Total | 222,498 | 51,767
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,996) | (7)
12 months or more | (66) | (190)
Total | (2,062) | (197)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 204,539 | 5,597
12 months or more | 15,897 | 45,973
Total | 220,436 | 51,570
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 194,869 | 534
12 months or more | 532 | 0
Total | 195,401 | 534
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (5,363) | (3)
12 months or more | (18) | 0
Total | (5,381) | (3)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 189,506 | 531
12 months or more | 514 | 0
Total | 190,020 | 531
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 470,340 | 58,463
12 months or more | 3,487 | 2,801
Total | 473,827 | 61,264
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (4,257) | (336)
12 months or more | (39) | (42)
Total | (4,296) | (378)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 466,083 | 58,127
12 months or more | 3,448 | 2,759
Total | 469,531 | 60,886
Asset-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 49,236 | 22,660
12 months or more | 1,420 | 26,283
Total | 50,656 | 48,943
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (130) | (29)
12 months or more | (1) | (179)
Total | (131) | (208)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 49,106 | 22,631
12 months or more | 1,419 | 26,104
Total | $ 50,525 | $ 48,735

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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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