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Securities - Schedule of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | $ 1,337,529 | $ 759,201
Less than 12 Months, Unrealized Loss | (120,954) | (13,966)
12 Months or More, Fair Value | 303,631 | 45,615
12 Months or More, Unrealized Loss | (35,038) | (1,683)
Total Fair Value | 1,641,160 | 804,816
Total Unrealized Loss | (155,992) | (15,649)
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 648,624 | 165,210
Less than 12 Months, Unrealized Loss | (75,715) | (1,386)
12 Months or More, Fair Value | 11,405 | 1,500
12 Months or More, Unrealized Loss | (2,081) | (94)
Total Fair Value | 660,029 | 166,710
Total Unrealized Loss | (77,796) | (1,480)
MBS/CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 480,333 | 467,888
Less than 12 Months, Unrealized Loss | (30,102) | (9,100)
12 Months or More, Fair Value | 285,351 | 36,827
12 Months or More, Unrealized Loss | (32,335) | (1,381)
Total Fair Value | 765,684 | 504,715
Total Unrealized Loss | (62,437) | (10,481)
US Gov’t Sponsored Entities & Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 208,572 | 126,103
Less than 12 Months, Unrealized Loss | (15,137) | (3,480)
12 Months or More, Fair Value | 6,875 | 7,288
12 Months or More, Unrealized Loss | (622) | (208)
Total Fair Value | 215,447 | 133,391
Total Unrealized Loss | $ (15,759) | $ (3,688)

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