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Investment Securities (Credit Quality Information) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | $ 536,970 | $ 559,455
Held-to-Maturity, Amortized cost | 537,133 | 559,455
Speculative |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 0 | 0
Aaa |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 137,359 |
Aa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 1,472 |
A3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 4,000 |
Baa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 4,000 |
Baa2 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 500 |
Baa3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 500 |
NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 389,302 |
U.S. Government agencies |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 144,882 | 148,097
U.S. Government agencies | Aaa |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 137,359 |
U.S. Government agencies | NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 7,523 |
Mortgage-backed |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 379,779 | 398,884
Mortgage-backed | NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 379,779 |
States and political subdivisions |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 1,472 | 1,474
States and political subdivisions | Aa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 1,472 |
Other debt securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 11,000 | $ 11,000
Other debt securities | A3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 4,000 |
Other debt securities | Baa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 4,000 |
Other debt securities | Baa2 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 500 |
Other debt securities | Baa3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | 500 |
Other debt securities | NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-Maturity, Amortized cost | $ 2,000 |

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