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Investment Securities Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Held-to-maturity Securities [Line Items] |  |
Due within 1 year | $ 1,800 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 1,807 |
Due after 1 but within 5 years | 5,568 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 5,616 |
Due after 5 but within 10 years | 43,207 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 42,769 |
Due after 10 years | 3,496 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 3,520 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost | 54,071 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 53,712 |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost | 493,986 |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 493,631 |
Debt Securities, Held-to-maturity | 548,057 | $ 361,844
Securities held to maturity, fair value | 547,343 | $ 369,851
US Government Agencies Residential Mortgage-backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 98,700 |
Securities held to maturity, fair value | 98,500 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 395,300 |
Securities held to maturity, fair value | $ 395,100 |

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