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Disclosures of Fair Values of Financial Instruments - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale securities: |  |
Total available-for-sale securities | $ 1,218,985,000 | $ 1,421,422,000
Equity securities, at fair value | 311,000 | 397,000
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 220,527,000 | 203,815,000
Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 287,698,000 | 395,457,000
Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 627,880,000 | 791,038,000
Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 82,880,000 | 31,112,000
Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 1,218,985,000 | 1,421,422,000
Equity securities, at fair value | 311,000 | 397,000
Derivative assets: interest rate swaps | 4,253,000 | 809,000
Assets, Fair Value Disclosure, Total | 1,223,549,000 | 1,422,628,000
Derivative liabilities: interest swaps | 3,100,000 | 1,476,000
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 | 220,527,000 | 203,815,000
Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 287,698,000 | 395,457,000
Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 627,880,000 | 791,038,000
Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 82,880,000 | 31,112,000
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 | 311,000 | 397,000
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 | 311,000 | 397,000
Derivative assets: interest rate swaps | 0 | 0
Assets, Fair Value Disclosure, Total | 311,000 | 397,000
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 | 1,209,736,000 | 1,421,323,000
Equity securities, at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 1,209,735,000 | 1,421,323,000
Equity securities, at fair value | 0 | 0
Derivative assets: interest rate swaps | 4,253,000 | 809,000
Assets, Fair Value Disclosure, Total | 1,213,988,000 | 1,422,132,000
Derivative liabilities: interest swaps | 3,100,000 | 1,476,000
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 | 220,527,000 | 203,815,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 287,698,000 | 395,358,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 627,880,000 | 791,038,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 73,630,000 | 31,112,000
Significant Unobservable Inputs (Level 3) |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 9,250,000 | 99,000
Equity securities, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 9,250,000 | 99,000
Equity securities, at fair value | 0 | 0
Derivative assets: interest rate swaps | 0 | 0
Assets, Fair Value Disclosure, Total | 9,250,000 | 99,000
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 | 99,000
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 | $ 9,250,000 | $ 0

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