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Investment Securities Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Due within 1 year | $ 518 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 518 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 752 | $ 387
Debt Securities, Held-to-maturity | 384,909 | 393,855
Securities held to maturity, fair value | 380,443 | $ 383,993
Due after 1 but within 5 years | 7,922 |
Due after 5 but within 10 years | 34,264 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 34,590 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 7,965 |
Due after 10 years | 0 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 0 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost | 42,704 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 43,073 |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost | 342,205 |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 337,370 |
US Government Agencies Residential Mortgage-backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 58,500 |
Securities held to maturity, fair value | 56,700 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 283,700 |
Securities held to maturity, fair value | $ 280,700 |

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