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Fair Value of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale securities: |  |
Total available-for-sale securities | $ 1,466,950,000 | $ 1,421,422,000
Equity securities, at fair value | 369,000 | 397,000
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 247,976,000 | 203,815,000
Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 358,679,000 | 395,457,000
Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 761,527,000 | 791,038,000
Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 98,768,000 | 31,112,000
Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 1,466,950,000 | 1,421,422,000
Equity securities, at fair value | 369,000 | 397,000
Derivative assets, Interest rate swaps | 2,286,000 | 809,000
Total assets | 1,469,605,000 | 1,422,628,000
Derivative liabilities, Interest rate swaps | 2,167,000 | 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 | 247,976,000 | 203,815,000
Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 358,679,000 | 395,457,000
Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 761,527,000 | 791,038,000
Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 98,768,000 | 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 | 369,000 | 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 | 369,000 | 397,000
Derivative assets, Interest rate swaps | 0 | 0
Total assets | 369,000 | 397,000
Derivative liabilities, Interest rate 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 | 1,466,950,000 | 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 | 1,466,950,000 | 1,421,323,000
Equity securities, at fair value | 0 | 0
Derivative assets, Interest rate swaps | 2,286,000 | 809,000
Total assets | 1,469,236,000 | 1,422,132,000
Derivative liabilities, Interest rate swaps | 2,167,000 | 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 | 247,976,000 | 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 | 358,679,000 | 395,358,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 761,527,000 | 791,038,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 98,768,000 | 31,112,000
Significant Unobservable Inputs (Level 3) |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 0 | 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 | 0 | 99,000
Equity securities, at fair value | 0 | 0
Derivative assets, Interest rate swaps | 0 | 0
Total assets | 0 | 99,000
Derivative liabilities, Interest rate 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 | $ 0 | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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