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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 39,707 | $ 34,698
Available-for-sale, Less than 12 months, Unrealized Losses | (869) | (843)
Available-for-sale, 12 months or longer, Fair Value | 1,057,538 | 1,075,835
Available-for-sale, 12 months or longer, Unrealized losses | (203,245) | (192,616)
Available-for-sale, Total Fair Value | 1,097,245 | 1,110,533
Available-for-sale, Total Unrealized Losses | (204,114) | (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 | 1,295 | 1,288
Available-for-sale, Less than 12 months, Unrealized Losses | 0 | (4)
Available-for-sale, 12 months or longer, Fair Value | 206,025 | 210,069
Available-for-sale, 12 months or longer, Unrealized losses | (27,220) | (26,215)
Available-for-sale, Total Fair Value | 207,320 | 211,357
Available-for-sale, Total Unrealized Losses | (27,220) | (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 | 27,302 | 22,281
Available-for-sale, Less than 12 months, Unrealized Losses | (324) | (333)
Available-for-sale, 12 months or longer, Fair Value | 248,168 | 241,630
Available-for-sale, 12 months or longer, Unrealized losses | (52,540) | (49,038)
Available-for-sale, Total Fair Value | 275,470 | 263,911
Available-for-sale, Total Unrealized Losses | (52,864) | (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 | 5,773 | 5,818
Available-for-sale, Less than 12 months, Unrealized Losses | (132) | (67)
Available-for-sale, 12 months or longer, Fair Value | 545,899 | 566,197
Available-for-sale, 12 months or longer, Unrealized losses | (119,639) | (113,007)
Available-for-sale, Total Fair Value | 551,672 | 572,015
Available-for-sale, Total Unrealized Losses | (119,771) | (113,074)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 5,337 | 5,311
Available-for-sale, Less than 12 months, Unrealized Losses | (413) | (439)
Available-for-sale, 12 months or longer, Fair Value | 57,446 | 57,939
Available-for-sale, 12 months or longer, Unrealized losses | (3,846) | (4,356)
Available-for-sale, Total Fair Value | 62,783 | 63,250
Available-for-sale, Total Unrealized Losses | $ (4,259) | $ (4,795)

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