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Fair Value of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale securities: |  |
Total available-for-sale securities | $ 1,139,427,000 | $ 1,171,572,000
Equity securities, at fair value | 4,298,000 | 4,074,000
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 207,320,000 | 211,656,000
Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 282,570,000 | 288,616,000
Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 581,004,000 | 602,300,000
Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 68,533,000 | 69,000,000
Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 1,139,427,000 | 1,171,572,000
Equity securities, at fair value | 4,298,000 | 4,074,000
Loans held for sale, fair value | 4,817,000 | 4,980,000
Derivative assets: interest rate swaps | 3,539,000 | 3,166,000
Total assets | 1,152,081,000 | 1,183,792,000
Derivative liabilities: interest swaps | 2,435,000 | 2,217,000
Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 207,320,000 | 211,656,000
Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 282,570,000 | 288,616,000
Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 581,004,000 | 602,300,000
Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 68,533,000 | 69,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 0 | 0
Equity securities, at fair value | 4,298,000 | 4,074,000
Loans held for sale, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 0 | 0
Equity securities, at fair value | 4,298,000 | 4,074,000
Loans held for sale, fair value | 0 | 0
Derivative assets: interest rate swaps | 0 | 0
Total assets | 4,298,000 | 4,074,000
Derivative liabilities: interest swaps | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 1,133,462,000 | 1,165,409,000
Equity securities, at fair value | 0 | 0
Loans held for sale, fair value | 4,817,000 | 4,980,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 1,133,462,000 | 1,165,409,000
Equity securities, at fair value | 0 | 0
Loans held for sale, fair value | 4,817,000 | 4,980,000
Derivative assets: interest rate swaps | 3,539,000 | 3,166,000
Total assets | 1,141,818,000 | 1,173,555,000
Derivative liabilities: interest swaps | 2,435,000 | 2,217,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 207,320,000 | 211,656,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 282,570,000 | 288,616,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 581,004,000 | 602,300,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 62,568,000 | 62,837,000
Significant Unobservable Inputs (Level 3) |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 5,965,000 | 6,163,000
Equity securities, at fair value | 0 | 0
Loans held for sale, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 5,965,000 | 6,163,000
Equity securities, at fair value | 0 | 0
Loans held for sale, fair value | 0 | 0
Derivative assets: interest rate swaps | 0 | 0
Total assets | 5,965,000 | 6,163,000
Derivative liabilities: interest swaps | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | $ 5,965,000 | $ 6,163,000

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