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Fair Value of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale securities: |  |
Total available-for-sale securities | $ 1,218,595,000 | $ 1,218,985,000
Equity securities, at fair value | 3,932,000 | 311,000
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 211,929,000 | 220,527,000
Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 266,473,000 | 287,698,000
Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 672,522,000 | 627,880,000
Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 67,671,000 | 82,880,000
Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 1,218,595,000 | 1,218,985,000
Equity securities, at fair value | 3,932,000 | 311,000
Loans held for sale, fair value | 6,233,000 | 338,000
Derivative assets: interest rate swaps | 4,349,000 | 4,253,000
Total assets | 1,233,109,000 | 1,223,887,000
Derivative liabilities: interest swaps | 2,932,000 | 3,100,000
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 | 211,929,000 | 220,527,000
Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 266,473,000 | 287,698,000
Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 672,522,000 | 627,880,000
Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 67,671,000 | 82,880,000
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 | 3,932,000 | 311,000
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 | 3,932,000 | 311,000
Loans held for sale, fair value | 0 | 0
Derivative assets: interest rate swaps | 0 | 0
Total assets | 3,932,000 | 311,000
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 | 1,212,835,000 | 1,209,736,000
Equity securities, at fair value | 0 | 0
Loans held for sale, fair value | 6,233,000 | 338,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 1,212,835,000 | 1,209,735,000
Equity securities, at fair value | 0 | 0
Loans held for sale, fair value | 6,233,000 | 338,000
Derivative assets: interest rate swaps | 4,349,000 | 4,253,000
Total assets | 1,223,417,000 | 1,214,326,000
Derivative liabilities: interest swaps | 2,932,000 | 3,100,000
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 | 211,929,000 | 220,527,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 266,473,000 | 287,698,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 672,522,000 | 627,880,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 61,911,000 | 73,630,000
Significant Unobservable Inputs (Level 3) |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 5,760,000 | 9,250,000
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 | 5,760,000 | 9,250,000
Equity securities, at fair value | 0 | 0
Loans held for sale, fair value | 0 | 0
Derivative assets: interest rate swaps | 0 | 0
Total assets | 5,760,000 | 9,250,000
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 | $ 5,760,000 | $ 9,250,000

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