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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 438,493 | $ 126,177
Available-for-sale, Less than 12 months, Unrealized Losses | (10,142) | (998)
Available-for-sale, 12 months or longer, Fair Value | 129,370 | 2,377
Available-for-sale, 12 months or longer, Unrealized losses | (983) | 0
Available-for-sale, Total Fair Value | 567,863 | 128,554
Available-for-sale, Total Unrealized Losses | (11,125) | (998)
U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 144,404 | 59,211
Available-for-sale, Less than 12 months, Unrealized Losses | (3,636) | (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 | 144,404 | 59,211
Available-for-sale, Total Unrealized Losses | (3,636) | (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 | 51,381 | 5,380
Available-for-sale, Less than 12 months, Unrealized Losses | (1,283) | (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 | 51,381 | 5,380
Available-for-sale, Total Unrealized Losses | (1,283) | (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 | 230,029 | 57,609
Available-for-sale, Less than 12 months, Unrealized Losses | (5,155) | (160)
Available-for-sale, 12 months or longer, Fair Value | 129,370 | 2,377
Available-for-sale, 12 months or longer, Unrealized losses | (983) | 0
Available-for-sale, Total Fair Value | 359,399 | 59,986
Available-for-sale, Total Unrealized Losses | (6,138) | (160)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 12,679 | 3,977
Available-for-sale, Less than 12 months, Unrealized Losses | (68) | (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 | 12,679 | 3,977
Available-for-sale, Total Unrealized Losses | $ (68) | $ (13)

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