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Securities - Securities with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | $ 777 | $ 1,812
Less than 12 months, unrealized losses | 3 | 29
More than 12 months, fair value | 490,709 | 501,940
More than 12 months, unrealized losses | 67,515 | 69,626
Total, fair value | 491,486 | 503,752
Total, unrealized losses | 67,518 | 69,655
U.S. Treasury Notes and Bonds [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 0 | 0
Less than 12 months, unrealized losses | 0 | 0
More than 12 months, fair value | 79,276 | 80,194
More than 12 months, unrealized losses | 10,953 | 10,151
Total, fair value | 79,276 | 80,194
Total, unrealized losses | 10,953 | 10,151
State and Municipal [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 0 | 557
Less than 12 months, unrealized losses | 0 | 6
More than 12 months, fair value | 230,928 | 234,125
More than 12 months, unrealized losses | 32,511 | 35,230
Total, fair value | 230,928 | 234,682
Total, unrealized losses | 32,511 | 35,236
Mortgage-backed [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 777 | 1,255
Less than 12 months, unrealized losses | 3 | 23
More than 12 months, fair value | 169,823 | 176,400
More than 12 months, unrealized losses | 23,754 | 23,882
Total, fair value | 170,600 | 177,655
Total, unrealized losses | 23,757 | 23,905
Corporate [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 0 | 0
Less than 12 months, unrealized losses | 0 | 0
More than 12 months, fair value | 204 | 204
More than 12 months, unrealized losses | 46 | 46
Total, fair value | 204 | 204
Total, unrealized losses | 46 | 46
Asset-backed Securities [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, fair value | 0 | 0
Less than 12 months, unrealized losses | 0 | 0
More than 12 months, fair value | 10,478 | 11,017
More than 12 months, unrealized losses | 251 | 317
Total, fair value | 10,478 | 11,017
Total, unrealized losses | $ 251 | $ 317

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