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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 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 | $ 435,007 | $ 126,177
Available-for-sale, Less than 12 months, Unrealized Losses | (6,702) | (998)
Available-for-sale, 12 months or longer, Fair Value | 121,550 | 2,377
Available-for-sale, 12 months or longer, Unrealized losses | (844) | 0
Available-for-sale, Total Fair Value | 556,557 | 128,554
Available-for-sale, Total Unrealized Losses | (7,546) | (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 | 165,101 | 59,211
Available-for-sale, Less than 12 months, Unrealized Losses | (2,853) | (788)
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 | 165,101 | 59,211
Available-for-sale, Total Unrealized Losses | (2,853) | (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 | 42,220 | 5,380
Available-for-sale, Less than 12 months, Unrealized Losses | (380) | (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 | 42,220 | 5,380
Available-for-sale, Total Unrealized Losses | (380) | (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 | 219,104 | 57,609
Available-for-sale, Less than 12 months, Unrealized Losses | (3,441) | (160)
Available-for-sale, 12 months or longer, Fair Value | 121,550 | 2,377
Available-for-sale, 12 months or longer, Unrealized losses | (844) | 0
Available-for-sale, Total Fair Value | 340,654 | 59,986
Available-for-sale, Total Unrealized Losses | (4,285) | (160)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 8,582 | 3,977
Available-for-sale, Less than 12 months, Unrealized Losses | (28) | (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 | 8,582 | 3,977
Available-for-sale, Total Unrealized Losses | $ (28) | $ (13)

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