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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 98.00% | 97.40%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 106,931 | $ 416,778
12 months or more | 1,258,638 | 981,280
Total | 1,365,569 | 1,398,058
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (3,146) | (21,324)
12 months or more | (146,742) | (153,300)
Total | (149,888) | (174,624)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 103,785 | 395,454
12 months or more | 1,111,896 | 827,980
Total | 1,215,681 | 1,223,434
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 5,825 | 144,305
12 months or more | 389,733 | 249,424
Total | 395,558 | 393,729
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (4) | (6,953)
12 months or more | (30,628) | (29,906)
Total | (30,632) | (36,859)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 5,821 | 137,352
12 months or more | 359,105 | 219,518
Total | 364,926 | 356,870
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 28,387 | 94,277
12 months or more | 275,555 | 225,019
Total | 303,942 | 319,296
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,148) | (6,257)
12 months or more | (49,639) | (55,419)
Total | (50,787) | (61,676)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 27,239 | 88,020
12 months or more | 225,916 | 169,600
Total | 253,155 | 257,620
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 65,273 | 139,314
12 months or more | 510,356 | 454,357
Total | 575,629 | 593,671
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,837) | (6,883)
12 months or more | (64,803) | (66,950)
Total | (66,640) | (73,833)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 63,436 | 132,431
12 months or more | 445,553 | 387,407
Total | 508,989 | 519,838
Asset-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 7,446 | 38,882
12 months or more | 82,994 | 52,480
Total | 90,440 | 91,362
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (157) | (1,231)
12 months or more | (1,672) | (1,025)
Total | (1,829) | (2,256)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 7,289 | 37,651
12 months or more | 81,322 | 51,455
Total | $ 88,611 | $ 89,106

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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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