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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 97.20% | 72.40%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 552,317 | $ 973,642
12 months or more | 898,838 | 97,329
Total | 1,451,155 | 1,070,971
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (42,877) | (15,851)
12 months or more | (145,686) | (1,832)
Total | (188,563) | (17,683)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 509,440 | 957,791
12 months or more | 753,152 | 95,497
Total | 1,262,592 | 1,053,288
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 174,884 | 249,990
12 months or more | 234,630 | 14,505
Total | 409,514 | 264,495
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (9,685) | (4,123)
12 months or more | (30,031) | (64)
Total | (39,716) | (4,187)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 165,199 | 245,867
12 months or more | 204,599 | 14,441
Total | 369,798 | 260,308
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 138,322 | 197,592
12 months or more | 184,173 | 19,126
Total | 322,495 | 216,718
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (19,957) | (4,779)
12 months or more | (48,227) | (760)
Total | (68,184) | (5,539)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 118,365 | 192,813
12 months or more | 135,946 | 18,366
Total | 254,311 | 211,179
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 191,768 | 473,831
12 months or more | 434,704 | 62,330
Total | 626,472 | 536,161
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (11,796) | (6,759)
12 months or more | (65,898) | (1,006)
Total | (77,694) | (7,765)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 179,972 | 467,072
12 months or more | 368,806 | 61,324
Total | 548,778 | 528,396
Asset-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 47,343 | 52,229
12 months or more | 45,331 | 1,368
Total | 92,674 | 53,597
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,439) | (190)
12 months or more | (1,530) | (2)
Total | (2,969) | (192)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 45,904 | 52,039
12 months or more | 43,801 | 1,366
Total | $ 89,705 | $ 53,405

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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 https://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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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