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Investment Securities (Credit Quality Information) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | $ 549,096 | $ 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 Securities, Amortized Cost | 137,358 |
Aa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 1,473 |
A3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 4,000 |
Baa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 4,000 |
Baa2 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 500 |
Baa3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 500 |
NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 401,265 |
U.S. Government agencies |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 146,699 |
U.S. Government agencies | Aaa |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 137,358 |
U.S. Government agencies | NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 9,341 |
Mortgage-backed |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 389,924 |
Mortgage-backed | NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 389,924 |
States and political subdivisions |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 1,473 |
States and political subdivisions | Aa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 1,473 |
Other debt securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 11,000 |
Other debt securities | A3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 4,000 |
Other debt securities | Baa1 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 4,000 |
Other debt securities | Baa2 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 500 |
Other debt securities | Baa3 |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 500 |
Other debt securities | NR |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | $ 2,000 |

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