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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | $ 752,588 | $ 126,177
Available-for-sale, Less than 12 months, Unrealized Losses | (10,515) | (998)
Available-for-sale, 12 months or longer, Fair Value | 9,742 | 2,377
Available-for-sale, 12 months or longer, Unrealized losses | (352) | 0
Available-for-sale, Total Fair Value | 762,330 | 128,554
Available-for-sale, Total Unrealized Losses | (10,867) | (998)
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 | 145,432 | 59,211
Available-for-sale, Less than 12 months, Unrealized Losses | (2,435) | (788)
Available-for-sale, 12 months or longer, Fair Value | 9,649 | 0
Available-for-sale, 12 months or longer, Unrealized losses | (351) | 0
Available-for-sale, Total Fair Value | 155,081 | 59,211
Available-for-sale, Total Unrealized Losses | (2,786) | (788)
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 | 87,767 | 5,380
Available-for-sale, Less than 12 months, Unrealized Losses | (960) | (37)
Available-for-sale, 12 months or longer, Fair Value | 0 | 0
Available-for-sale, 12 months or longer, Unrealized losses | 0 | 0
Available-for-sale, Total Fair Value | 87,767 | 5,380
Available-for-sale, Total Unrealized Losses | (960) | (37)
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 | 508,332 | 57,609
Available-for-sale, Less than 12 months, Unrealized Losses | (7,084) | (160)
Available-for-sale, 12 months or longer, Fair Value | 93 | 2,377
Available-for-sale, 12 months or longer, Unrealized losses | (1) | 0
Available-for-sale, Total Fair Value | 508,425 | 59,986
Available-for-sale, Total Unrealized Losses | (7,085) | (160)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 11,057 | 3,977
Available-for-sale, Less than 12 months, Unrealized Losses | (36) | (13)
Available-for-sale, 12 months or longer, Fair Value | 0 | 0
Available-for-sale, 12 months or longer, Unrealized losses | 0 | 0
Available-for-sale, Total Fair Value | 11,057 | 3,977
Available-for-sale, Total Unrealized Losses | $ (36) | $ (13)

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