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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 93.20% | 72.40%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 1,084,049 | $ 973,642
12 months or more | 355,613 | 97,329
Total | 1,439,662 | 1,070,971
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (90,130) | (15,851)
12 months or more | (42,530) | (1,832)
Total | (132,660) | (17,683)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 993,919 | 957,791
12 months or more | 313,083 | 95,497
Total | 1,307,002 | 1,053,288
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 382,012 | 249,990
12 months or more | 44,913 | 14,505
Total | 426,925 | 264,495
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (23,320) | (4,123)
12 months or more | (4,189) | (64)
Total | (27,509) | (4,187)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 358,692 | 245,867
12 months or more | 40,724 | 14,441
Total | 399,416 | 260,308
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 204,981 | 197,592
12 months or more | 99,653 | 19,126
Total | 304,634 | 216,718
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (28,227) | (4,779)
12 months or more | (21,633) | (760)
Total | (49,860) | (5,539)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 176,754 | 192,813
12 months or more | 78,020 | 18,366
Total | 254,774 | 211,179
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 449,017 | 473,831
12 months or more | 165,619 | 62,330
Total | 614,636 | 536,161
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (37,182) | (6,759)
12 months or more | (15,698) | (1,006)
Total | (52,880) | (7,765)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 411,835 | 467,072
12 months or more | 149,921 | 61,324
Total | 561,756 | 528,396
Asset-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 48,039 | 52,229
12 months or more | 45,428 | 1,368
Total | 93,467 | 53,597
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,401) | (190)
12 months or more | (1,010) | (2)
Total | (2,411) | (192)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 46,638 | 52,039
12 months or more | 44,418 | 1,366
Total | $ 91,056 | $ 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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