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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | $ 32,383 | $ 34,698
Available-for-sale, Less than 12 months, Unrealized Losses | (1,517) | (843)
Available-for-sale, 12 months or longer, Fair Value | 1,036,465 | 1,075,835
Available-for-sale, 12 months or longer, Unrealized losses | (199,931) | (192,616)
Available-for-sale, Total Fair Value | 1,068,848 | 1,110,533
Available-for-sale, Total Unrealized Losses | (201,448) | (193,459)
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 3,293 | 1,288
Available-for-sale, Less than 12 months, Unrealized Losses | (1) | (4)
Available-for-sale, 12 months or longer, Fair Value | 196,288 | 210,069
Available-for-sale, 12 months or longer, Unrealized losses | (25,248) | (26,215)
Available-for-sale, Total Fair Value | 199,581 | 211,357
Available-for-sale, Total Unrealized Losses | (25,249) | (26,219)
Obligations of States and Political Subdivisions |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 23,541 | 22,281
Available-for-sale, Less than 12 months, Unrealized Losses | (1,370) | (333)
Available-for-sale, 12 months or longer, Fair Value | 247,125 | 241,630
Available-for-sale, 12 months or longer, Unrealized losses | (56,082) | (49,038)
Available-for-sale, Total Fair Value | 270,666 | 263,911
Available-for-sale, Total Unrealized Losses | (57,452) | (49,371)
Mortgage-backed Securities: GSE Residential |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 5,549 | 5,818
Available-for-sale, Less than 12 months, Unrealized Losses | (146) | (67)
Available-for-sale, 12 months or longer, Fair Value | 535,856 | 566,197
Available-for-sale, 12 months or longer, Unrealized losses | (114,474) | (113,007)
Available-for-sale, Total Fair Value | 541,405 | 572,015
Available-for-sale, Total Unrealized Losses | (114,620) | (113,074)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 0 | 5,311
Available-for-sale, Less than 12 months, Unrealized Losses | 0 | (439)
Available-for-sale, 12 months or longer, Fair Value | 57,196 | 57,939
Available-for-sale, 12 months or longer, Unrealized losses | (4,127) | (4,356)
Available-for-sale, Total Fair Value | 57,196 | 63,250
Available-for-sale, Total Unrealized Losses | $ (4,127) | $ (4,795)

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