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Investment Securities (Details 2) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Marketable Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 256,540 | $ 26,228
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,157 | 228
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 15,164 | 2,737
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 185 | 40
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 271,704 | 28,965
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4,342 | 268
US Treasury Securities [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 15,384 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 346 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 15,384 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 346 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 215,705 | 21,298
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,316 | 152
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 15,164 | 1,414
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 185 | 33
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 230,869 | 22,712
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3,501 | 185
Small Business Administration pools [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 7,296 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 57 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 1,323
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 7,296 | 1,323
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 57 | 7
US States and Political Subdivisions Debt Securities [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 15,992 | 4,930
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 344 | 76
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 15,992 | 4,930
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 344 | $ 76
Corporate and other securities [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 2,163 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 94 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,163 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 94 |

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