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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 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Available-for-Sale: Fair Value | $ 4,258,534 | $ 4,276,056
Loans Held for Sale | 5,293 | 26,746
Debt Securities Issued by States and Political Subdivisions |  |
Assets: |  |
Available-for-Sale: Fair Value | 69,668 | 75,818
Debt Securities Issued by Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,701 | 1,780
Debt Securities Issued by Corporations |  |
Assets: |  |
Available-for-Sale: Fair Value | 409,606 | 383,113
Residential - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,291,150 | 1,319,042
Residential - U.S. Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 2,030,281 | 2,090,326
Mortgage-Backed Securities |  |
Assets: |  |
Available-for-Sale: Fair Value | 3,502,396 | 3,565,258
Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-Sale: Fair Value | 4,258,534 | 4,276,056
Loans Held for Sale | 5,293 | 26,746
Mortgage Servicing Rights | 781 | 800
Other Assets | 54,490 | 56,411
Derivatives | 12,931 | 42,011
Total Assets Measured at Fair Value on a Recurring Basis | 4,332,029 | 4,402,024
Liabilities: |  |
Derivatives | 65,165 | 18,816
Total Liabilities Measured at Fair Value on a Recurring Basis | 65,165 | 18,816
Fair Value, Measurements, Recurring | Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 275,163 | 250,087
Fair Value, Measurements, Recurring | Debt Securities Issued by States and Political Subdivisions |  |
Assets: |  |
Available-for-Sale: Fair Value | 69,668 | 75,818
Fair Value, Measurements, Recurring | Debt Securities Issued by Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,701 | 1,780
Fair Value, Measurements, Recurring | Debt Securities Issued by Corporations |  |
Assets: |  |
Available-for-Sale: Fair Value | 409,606 | 383,113
Fair Value, Measurements, Recurring | Residential - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,291,150 | 1,319,042
Fair Value, Measurements, Recurring | Residential - U.S. Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 2,030,281 | 2,090,326
Fair Value, Measurements, Recurring | Commercial - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 180,965 | 155,890
Fair Value, Measurements, Recurring | Mortgage-Backed Securities |  |
Assets: |  |
Available-for-Sale: Fair Value | 3,502,396 | 3,565,258
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  |
Assets: |  |
Available-for-Sale: Fair Value | 148,560 | 114,845
Loans Held for Sale | 0 | 0
Mortgage Servicing Rights | 0 | 0
Other Assets | 54,490 | 56,411
Derivatives | 0 | 0
Total Assets Measured at Fair Value on a Recurring Basis | 203,050 | 171,256
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 | 148,560 | 114,845
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 | 4,109,974 | 4,161,211
Loans Held for Sale | 5,293 | 26,746
Mortgage Servicing Rights | 0 | 0
Other Assets | 0 | 0
Derivatives | 551 | 194
Total Assets Measured at Fair Value on a Recurring Basis | 4,115,818 | 4,188,151
Liabilities: |  |
Derivatives | 2,356 | 903
Total Liabilities Measured at Fair Value on a Recurring Basis | 2,356 | 903
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 | 126,603 | 135,242
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by States and Political Subdivisions |  |
Assets: |  |
Available-for-Sale: Fair Value | 69,668 | 75,818
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,701 | 1,780
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Corporations |  |
Assets: |  |
Available-for-Sale: Fair Value | 409,606 | 383,113
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,291,150 | 1,319,042
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - U.S. Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 2,030,281 | 2,090,326
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 180,965 | 155,890
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Backed Securities |  |
Assets: |  |
Available-for-Sale: Fair Value | 3,502,396 | 3,565,258
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 | 781 | 800
Other Assets | 0 | 0
Derivatives | 12,380 | 41,817
Total Assets Measured at Fair Value on a Recurring Basis | 13,161 | 42,617
Liabilities: |  |
Derivatives | 62,809 | 17,913
Total Liabilities Measured at Fair Value on a Recurring Basis | 62,809 | 17,913
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 Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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