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Investment Securities - Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Held-to-maturity Securities, Amortized Cost |  |
Within one year | $ 102 | $ 246
After one but within five years | 23,536 | 7,550
After five years through ten years | 51,125 | 52,113
After ten years | 122,038 | 49,127
Total | 196,801 | 109,036
Held-to-maturity Securities, Fair Value |  |
Within one year | 104 | 250
After one but within five years | 24,725 | 7,961
After five years through ten years | 53,105 | 55,872
After ten years | 123,118 | 51,102
Total | 201,052 | 115,185
Available-for-sale Securities, Amortized Cost |  |
Within one year | 11,700 | 11,530
After one but within five years | 75,784 | 59,028
After five years through ten years | 314,110 | 144,908
After ten years | 550,684 | 157,572
Available-for-sale, amortized cost | 952,278 | 373,038
Available-for-sale Securities, Fair Value |  |
Within one year | 11,818 | 11,687
After one but within five years | 77,755 | 62,397
After five years through ten years | 318,801 | 154,089
After ten years | 554,659 | 164,178
Total | $ 963,033 | $ 392,351

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