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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
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Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | $ 948,129,000 | $ 680,526,000
Available-for-sale, Less than 12 months, Unrealized Losses | (129,854,000) | (13,708,000)
Available-for-sale, 12 months or longer, Fair Value | 310,522,000 | 186,350,000
Available-for-sale, 12 months or longer, Unrealized losses | (51,516,000) | (4,627,000)
Available-for-sale, Total Fair Value | 1,258,651,000 | 866,876,000
Available-for-sale, Total Unrealized Losses | (181,370,000) | (18,335,000)
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 | 121,758,000 | 48,316,000
Available-for-sale, Less than 12 months, Unrealized Losses | (8,930,000) | (1,927,000)
Available-for-sale, 12 months or longer, Fair Value | 111,991,000 | 139,846,000
Available-for-sale, 12 months or longer, Unrealized losses | (15,618,000) | (2,936,000)
Available-for-sale, Total Fair Value | 233,749,000 | 188,162,000
Available-for-sale, Total Unrealized Losses | (24,548,000) | (4,863,000)
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 | 253,771,000 | 61,535,000
Available-for-sale, Less than 12 months, Unrealized Losses | (55,918,000) | (657,000)
Available-for-sale, 12 months or longer, Fair Value | 7,466,000 | 0
Available-for-sale, 12 months or longer, Unrealized losses | (2,626,000) | 0
Available-for-sale, Total Fair Value | 261,237,000 | 61,535,000
Available-for-sale, Total Unrealized Losses | (58,544,000) | (657,000)
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 | 505,673,000 | 562,699,000
Available-for-sale, Less than 12 months, Unrealized Losses | (62,477,000) | (11,019,000)
Available-for-sale, 12 months or longer, Fair Value | 188,576,000 | 46,504,000
Available-for-sale, 12 months or longer, Unrealized losses | (33,196,000) | (1,691,000)
Available-for-sale, Total Fair Value | 694,249,000 | 609,203,000
Available-for-sale, Total Unrealized Losses | (95,673,000) | (12,710,000)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 66,927,000 | 7,976,000
Available-for-sale, Less than 12 months, Unrealized Losses | (2,529,000) | (105,000)
Available-for-sale, 12 months or longer, Fair Value | 2,489,000 | 0
Available-for-sale, 12 months or longer, Unrealized losses | (76,000) | 0
Available-for-sale, Total Fair Value | 69,416,000 | 7,976,000
Available-for-sale, Total Unrealized Losses | $ (2,605,000) | $ (105,000)

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