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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | $ 126,177,000 | $ 93,924,000
Available-for-sale, Less than 12 months, Unrealized Losses | (998,000) | (398,000)
Available-for-sale, 12 months or longer, Fair Value | 2,377,000 | 21,235,000
Available-for-sale, 12 months or longer, Unrealized losses | 0 | (191,000)
Available-for-sale, Total Fair Value | 128,554,000 | 115,159,000
Available-for-sale, Total Unrealized Losses | (998,000) | (589,000)
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 | 59,211,000 | 23,375,000
Available-for-sale, Less than 12 months, Unrealized Losses | (788,000) | (60,000)
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 | 59,211,000 | 23,375,000
Available-for-sale, Total Unrealized Losses | (788,000) | (60,000)
Held-to-maturity, [Abstract] |  |
Held-to-maturity, Less than 12 months, Fair Value | 0 | 14,996,000
Held-to-maturity, Less than 12 months, Unrealized Losses | 0 | (25,000)
Held-to-maturity, 12 months or longer, Fair Value | 0 | 24,565,000
Held-to-maturity, 12 months or longer, Unrealized losses | 0 | (44,000)
Held-to-maturity,Total Fair Value | 0 | 39,561,000
Held-to-maturity, Total Unrealized Losses | 0 | (69,000)
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 | 5,380,000 | 3,469,000
Available-for-sale, Less than 12 months, Unrealized Losses | (37,000) | (16,000)
Available-for-sale, 12 months or longer, Fair Value | 0 | 347,000
Available-for-sale, 12 months or longer, Unrealized losses | 0 | (1,000)
Available-for-sale, Total Fair Value | 5,380,000 | 3,816,000
Available-for-sale, Total Unrealized Losses | (37,000) | (17,000)
Held-to-maturity, [Abstract] |  |
Held-to-maturity, 12 months or longer, Fair Value |  | 347,000
Held-to-maturity, 12 months or longer, Unrealized losses |  | (1,000)
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 | 57,609,000 | 67,080,000
Available-for-sale, Less than 12 months, Unrealized Losses | (160,000) | (322,000)
Available-for-sale, 12 months or longer, Fair Value | 2,377,000 | 20,888,000
Available-for-sale, 12 months or longer, Unrealized losses | 0 | (190,000)
Available-for-sale, Total Fair Value | 59,986,000 | 87,968,000
Available-for-sale, Total Unrealized Losses | (160,000) | $ (512,000)
Other Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Available-for-sale, Less than 12 months, Fair Value | 3,977,000 |
Available-for-sale, Less than 12 months, Unrealized Losses | (13,000) |
Available-for-sale, 12 months or longer, Fair Value | 0 |
Available-for-sale, 12 months or longer, Unrealized losses | 0 |
Available-for-sale, Total Fair Value | 3,977,000 |
Available-for-sale, Total Unrealized Losses | $ (13,000) |

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