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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 53.20% | 16.20%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 585,705 | $ 87,261
12 months or more | 38,448 | 75,247
Total | 624,153 | 162,508
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (9,593) | (375)
12 months or more | (188) | (411)
Total | (9,781) | (786)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 576,112 | 86,886
12 months or more | 38,260 | 74,836
Total | 614,372 | 161,722
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 136,625 | 5,604
12 months or more | 28,763 | 46,163
Total | 165,388 | 51,767
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (2,028) | (7)
12 months or more | (127) | (190)
Total | (2,155) | (197)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 134,597 | 5,597
12 months or more | 28,636 | 45,973
Total | 163,233 | 51,570
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 101,944 | 534
12 months or more | 533 | 0
Total | 102,477 | 534
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (4,660) | (3)
12 months or more | (28) | 0
Total | (4,688) | (3)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 97,284 | 531
12 months or more | 505 | 0
Total | 97,789 | 531
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 347,136 | 58,463
12 months or more | 2,614 | 2,801
Total | 349,750 | 61,264
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (2,905) | (336)
12 months or more | (13) | (42)
Total | (2,918) | (378)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 344,231 | 58,127
12 months or more | 2,601 | 2,759
Total | 346,832 | 60,886
Other Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 0 | 22,660
12 months or more | 6,538 | 26,283
Total | 6,538 | 48,943
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | 0 | (29)
12 months or more | (20) | (179)
Total | (20) | (208)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 0 | 22,631
12 months or more | 6,518 | 26,104
Total | $ 6,518 | $ 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=121582814&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=121645371&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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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, 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 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: 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=121582814&loc=SL82922890-210455 + Details
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