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Securities - Schedule of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | $ 1,395,678 | $ 759,201
Less than 12 Months, Unrealized Loss | (215,350) | (13,966)
12 Months or More, Fair Value | 291,271 | 45,615
12 Months or More, Unrealized Loss | (53,278) | (1,683)
Total Fair Value | 1,686,949 | 804,816
Total Unrealized Loss | (268,628) | (15,649)
U.S. Treasury and Agency Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 1,493 |
Less than 12 Months, Unrealized Loss | (1) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Loss | 0 |
Total Fair Value | 1,493 |
Total Unrealized Loss | (1) |
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 695,986 | 165,210
Less than 12 Months, Unrealized Loss | (142,294) | (1,386)
12 Months or More, Fair Value | 14,716 | 1,500
12 Months or More, Unrealized Loss | (4,778) | (94)
Total Fair Value | 710,702 | 166,710
Total Unrealized Loss | (147,072) | (1,480)
MBS/CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 499,905 | 467,888
Less than 12 Months, Unrealized Loss | (48,520) | (9,100)
12 Months or More, Fair Value | 269,902 | 36,827
12 Months or More, Unrealized Loss | (47,657) | (1,381)
Total Fair Value | 769,807 | 504,715
Total Unrealized Loss | (96,177) | (10,481)
US Gov’t Sponsored Entities & Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 198,294 | 126,103
Less than 12 Months, Unrealized Loss | (24,535) | (3,480)
12 Months or More, Fair Value | 6,653 | 7,288
12 Months or More, Unrealized Loss | (843) | (208)
Total Fair Value | 204,947 | 133,391
Total Unrealized Loss | $ (25,378) | $ (3,688)

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