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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 43.60% | 16.20%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 570,341 | $ 87,261
12 months or more | 26,790 | 75,247
Total | 597,131 | 162,508
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (5,073) | (375)
12 months or more | (134) | (411)
Total | (5,207) | (786)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 565,268 | 86,886
12 months or more | 26,656 | 74,836
Total | 591,924 | 161,722
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 111,855 | 5,604
12 months or more | 22,311 | 46,163
Total | 134,166 | 51,767
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (837) | (7)
12 months or more | (94) | (190)
Total | (931) | (197)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 111,018 | 5,597
12 months or more | 22,217 | 45,973
Total | 133,235 | 51,570
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 101,456 | 534
12 months or more | 532 | 0
Total | 101,988 | 534
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (2,151) | (3)
12 months or more | (16) | 0
Total | (2,167) | (3)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 99,305 | 531
12 months or more | 516 | 0
Total | 99,821 | 531
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 330,841 | 58,463
12 months or more | 2,468 | 2,801
Total | 333,309 | 61,264
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (2,020) | (336)
12 months or more | (8) | (42)
Total | (2,028) | (378)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 328,821 | 58,127
12 months or more | 2,460 | 2,759
Total | 331,281 | 60,886
Other Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 26,189 | 22,660
12 months or more | 1,479 | 26,283
Total | 27,668 | 48,943
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (65) | (29)
12 months or more | (16) | (179)
Total | (81) | (208)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 26,124 | 22,631
12 months or more | 1,463 | 26,104
Total | $ 27,587 | $ 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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