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Fair Value of Assets and Liabilities - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Assets: |  |  |
Available-for-Sale: Fair Value | $ 4,276,056 | $ 3,791,689 | $ 2,619,003
Loans Held for Sale | 26,746 | 82,565 |
Derivatives | 42,011 | 96,167 |
Debt Securities Issued by States and Political Subdivisions |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 75,818 | 24,840 | 55,097
Debt Securities Issued by Government-Sponsored Enterprises |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 1,780 | 1,062 | 22,147
Debt Securities Issued by Corporations |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 383,113 | 224,605 | 336,321
Residential - Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 1,319,042 | 1,594,815 | 1,172,826
Residential - U.S. Government-Sponsored Enterprises |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 2,090,326 | 1,518,283 | 586,761
Commercial - Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 155,890 | 253,839 | 224,720
Mortgage-Backed Securities |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 3,565,258 | 3,366,937 | $ 1,984,307
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 4,276,056 | 3,791,689 |
Loans Held for Sale | 26,746 | 82,565 |
Mortgage Servicing Rights | 800 | 958 |
Other Assets | 56,411 | 53,410 |
Derivatives | 42,011 | 96,167 |
Total Assets Measured at Fair Value on a Recurring Basis | 4,402,024 | 4,024,789 |
Liabilities: |  |  |
Derivatives | 18,816 | 18,161 |
Total Liabilities Measured at Fair Value on a Recurring Basis | 18,816 | 18,161 |
Fair Value, Measurements, Recurring | Debt Securities Issued by the U.S. Treasury and Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 250,087 | 174,245 |
Fair Value, Measurements, Recurring | Debt Securities Issued by States and Political Subdivisions |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 75,818 | 24,840 |
Fair Value, Measurements, Recurring | Debt Securities Issued by Government-Sponsored Enterprises |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 1,780 | 1,062 |
Fair Value, Measurements, Recurring | Debt Securities Issued by Corporations |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 383,113 | 224,605 |
Fair Value, Measurements, Recurring | Residential - Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 1,319,042 | 1,594,815 |
Fair Value, Measurements, Recurring | Residential - U.S. Government-Sponsored Enterprises |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 2,090,326 | 1,518,283 |
Fair Value, Measurements, Recurring | Commercial - Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 155,890 | 253,839 |
Fair Value, Measurements, Recurring | Mortgage-Backed Securities |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 3,565,258 | 3,366,937 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 114,845 | 921 |
Loans Held for Sale | 0 | 0 |
Mortgage Servicing Rights | 0 | 0 |
Other Assets | 56,411 | 53,410 |
Derivatives | 0 | 0 |
Total Assets Measured at Fair Value on a Recurring Basis | 171,256 | 54,331 |
Liabilities: |  |  |
Derivatives | 0 | 0 |
Total Liabilities Measured at Fair Value on a Recurring Basis | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by the U.S. Treasury and Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 114,845 | 921 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by States and Political Subdivisions |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by Government-Sponsored Enterprises |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by Corporations |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Residential - Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Residential - U.S. Government-Sponsored Enterprises |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Commercial - Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgage-Backed Securities |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 4,161,211 | 3,790,768 |
Loans Held for Sale | 26,746 | 82,565 |
Mortgage Servicing Rights | 0 | 0 |
Other Assets | 0 | 0 |
Derivatives | 194 | 878 |
Total Assets Measured at Fair Value on a Recurring Basis | 4,188,151 | 3,874,211 |
Liabilities: |  |  |
Derivatives | 903 | 752 |
Total Liabilities Measured at Fair Value on a Recurring Basis | 903 | 752 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by the U.S. Treasury and Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 135,242 | 173,324 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by States and Political Subdivisions |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 75,818 | 24,840 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Government-Sponsored Enterprises |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 1,780 | 1,062 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Corporations |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 383,113 | 224,605 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 1,319,042 | 1,594,815 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - U.S. Government-Sponsored Enterprises |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 2,090,326 | 1,518,283 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial - Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 155,890 | 253,839 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Backed Securities |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 3,565,258 | 3,366,937 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Loans Held for Sale | 0 | 0 |
Mortgage Servicing Rights | 800 | 958 |
Other Assets | 0 | 0 |
Derivatives | 41,817 | 95,289 |
Total Assets Measured at Fair Value on a Recurring Basis | 42,617 | 96,247 |
Liabilities: |  |  |
Derivatives | 17,913 | 17,409 |
Total Liabilities Measured at Fair Value on a Recurring Basis | 17,913 | 17,409 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by the U.S. Treasury and Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by States and Political Subdivisions |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by Government-Sponsored Enterprises |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by Corporations |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Residential - Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Residential - U.S. Government-Sponsored Enterprises |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Commercial - Government Agencies |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Mortgage-Backed Securities |  |  |
Assets: |  |  |
Available-for-Sale: Fair Value | $ 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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