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Investment Securities (Credit Quality Information) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 523,177 | $ 559,455
Aaa |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 511,206 |
Aa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 1,471 |
A3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 4,000 |
Baa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 4,000 |
Baa2 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 500 |
NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 2,000 |
U.S. Government agencies |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 143,494 | 148,097
U.S. Government agencies | Aaa |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 143,494 |
U.S. Government agencies | Aa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
U.S. Government agencies | A3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
U.S. Government agencies | Baa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
U.S. Government agencies | Baa2 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
U.S. Government agencies | NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Mortgage-backed-residential |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 367,712 | 398,884
Mortgage-backed-residential | Aaa |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 367,712 |
Mortgage-backed-residential | Aa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Mortgage-backed-residential | A3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Mortgage-backed-residential | Baa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Mortgage-backed-residential | Baa2 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Mortgage-backed-residential | NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
States and political subdivisions |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 1,471 | 1,474
States and political subdivisions | Aaa |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
States and political subdivisions | Aa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 1,471 |
States and political subdivisions | A3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
States and political subdivisions | Baa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
States and political subdivisions | Baa2 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
States and political subdivisions | NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Other debt securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 10,500 | $ 11,000
Other debt securities | Aaa |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Other debt securities | Aa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Other debt securities | A3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 4,000 |
Other debt securities | Baa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 4,000 |
Other debt securities | Baa2 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 500 |
Other debt securities | NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 2,000 |

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