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Fair Value of Assets and Liabilities - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale securities: |  |
Total available-for-sale securities | $ 1,346,966,000 | $ 879,240,000
Equity securities, at fair value | 348,000 | 218,000
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 191,684,000 | 127,069,000
Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 338,744,000 | 249,844,000
Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 782,615,000 | 491,348,000
Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 33,923,000 | 10,979,000
Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 1,346,966,000 | 879,240,000
Equity securities, at fair value | 348,000 | 218,000
Derivative assets, Interest rate swaps | 35,000 | 1,399,000
Total assets | 1,347,349,000 | 880,857,000
Derivative liabilities, Interest rate swaps | 899,000 | 2,892,000
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 | 191,684,000 | 127,069,000
Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 338,744,000 | 249,844,000
Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 782,615,000 | 491,348,000
Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 33,923,000 | 10,979,000
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 | 348,000 | 218,000
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 | 348,000 | 218,000
Derivative assets, Interest rate swaps | 0 | 0
Total assets | 348,000 | 218,000
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 | 1,346,351,000 | 878,446,000
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 | 1,346,350,000 | 878,446,000
Equity securities, at fair value | 0 | 193,000
Derivative assets, Interest rate swaps | 35,000 | 1,399,000
Total assets | 1,346,385,000 | 880,038,000
Derivative liabilities, Interest rate swaps | 899,000 | 2,892,000
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 | 191,684,000 | 127,069,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Obligations of States and Political Subdivisions |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 338,128,000 | 249,050,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Mortgage-backed Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 782,615,000 | 491,348,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Other Securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 33,923,000 | 10,979,000
Significant Unobservable Inputs (Level 3) |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 615,000 | 794,000
Equity securities, at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 616,000 | 794,000
Equity securities, at fair value | 0 | 0
Derivative assets, Interest rate swaps | 0 | 0
Total assets | 616,000 | 794,000
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 | 616,000 | 794,000
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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