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FAIR VALUE - Financial Assets and Liabilities Accounted for at Fair Value On a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale investment securities |  |
Available-for-sale investment securities | $ 5,590,427 | $ 4,934,210
Equity securities | 443 | 463
Derivative asset |  | 51
U.S. Treasury and Agency Securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 4,615,546 | 3,998,564
Obligations of State and Political Subdivisions |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 527,155 | 430,289
Government Agency Mortgage-Backed Securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 425,357 | 477,056
Corporate debt securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 7,231 | 7,962
Government Agency Collateralized Mortgage Obligations |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 15,138 | 20,339
Significant Unobservable Inputs, Level 3 |  |
Available-for-sale investment securities |  |
Derivative asset | 6 |
Recurring |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 5,590,427 | 4,934,210
Equity securities | 443 | 463
Total | 5,590,905 | 4,935,049
Recurring | Interest Rate Swap Agreements |  |
Available-for-sale investment securities |  |
Derivative asset | 8 | 296
Derivative liability | (2) | 3
Recurring | ForwardContractsMember |  |
Available-for-sale investment securities |  |
Derivative asset | 23 | 32
Recurring | Commitments to Originate Real Estate Loans for Sale |  |
Available-for-sale investment securities |  |
Derivative asset | 6 | 51
Recurring | U.S. Treasury and Agency Securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 4,615,546 | 3,998,564
Recurring | Obligations of State and Political Subdivisions |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 527,155 | 430,289
Recurring | Government Agency Mortgage-Backed Securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 425,357 | 477,056
Recurring | Corporate debt securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 7,231 | 7,962
Recurring | Government Agency Collateralized Mortgage Obligations |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 15,138 | 20,339
Recurring | Quoted Prices in Active Markets For Identical Assets, Level 1 |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 4,540,596 | 3,900,924
Equity securities | 443 | 463
Total | 4,541,039 | 3,901,387
Recurring | Quoted Prices in Active Markets For Identical Assets, Level 1 | Interest Rate Swap Agreements |  |
Available-for-sale investment securities |  |
Derivative asset | 0 | 0
Derivative liability | 0 | 0
Recurring | Quoted Prices in Active Markets For Identical Assets, Level 1 | ForwardContractsMember |  |
Available-for-sale investment securities |  |
Derivative asset | 0 | 0
Recurring | Quoted Prices in Active Markets For Identical Assets, Level 1 | Commitments to Originate Real Estate Loans for Sale |  |
Available-for-sale investment securities |  |
Derivative asset | 0 | 0
Recurring | Quoted Prices in Active Markets For Identical Assets, Level 1 | U.S. Treasury and Agency Securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 4,540,596 | 3,900,924
Recurring | Quoted Prices in Active Markets For Identical Assets, Level 1 | Obligations of State and Political Subdivisions |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 0 | 0
Recurring | Quoted Prices in Active Markets For Identical Assets, Level 1 | Government Agency Mortgage-Backed Securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 0 | 0
Recurring | Quoted Prices in Active Markets For Identical Assets, Level 1 | Corporate debt securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 0 | 0
Recurring | Quoted Prices in Active Markets For Identical Assets, Level 1 | Government Agency Collateralized Mortgage Obligations |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 0 | 0
Recurring | Significant Observable Inputs, Level 2 |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 1,049,831 | 1,033,286
Equity securities | 0 | 0
Total | 1,049,860 | 1,033,611
Recurring | Significant Observable Inputs, Level 2 | Interest Rate Swap Agreements |  |
Available-for-sale investment securities |  |
Derivative asset | 8 | 296
Derivative liability | (2) | 3
Recurring | Significant Observable Inputs, Level 2 | ForwardContractsMember |  |
Available-for-sale investment securities |  |
Derivative asset | 23 | 32
Recurring | Significant Observable Inputs, Level 2 | Commitments to Originate Real Estate Loans for Sale |  |
Available-for-sale investment securities |  |
Derivative asset | 0 | 0
Recurring | Significant Observable Inputs, Level 2 | U.S. Treasury and Agency Securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 74,950 | 97,640
Recurring | Significant Observable Inputs, Level 2 | Obligations of State and Political Subdivisions |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 527,155 | 430,289
Recurring | Significant Observable Inputs, Level 2 | Government Agency Mortgage-Backed Securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 425,357 | 477,056
Recurring | Significant Observable Inputs, Level 2 | Corporate debt securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 7,231 | 7,962
Recurring | Significant Observable Inputs, Level 2 | Government Agency Collateralized Mortgage Obligations |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 15,138 | 20,339
Recurring | Significant Unobservable Inputs, Level 3 |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 0 | 0
Equity securities | 0 | 0
Total | 6 | 51
Recurring | Significant Unobservable Inputs, Level 3 | Interest Rate Swap Agreements |  |
Available-for-sale investment securities |  |
Derivative asset | 0 | 0
Derivative liability | 0 | 0
Recurring | Significant Unobservable Inputs, Level 3 | ForwardContractsMember |  |
Available-for-sale investment securities |  |
Derivative asset | 0 | 0
Recurring | Significant Unobservable Inputs, Level 3 | Commitments to Originate Real Estate Loans for Sale |  |
Available-for-sale investment securities |  |
Derivative asset | 6 | 51
Recurring | Significant Unobservable Inputs, Level 3 | U.S. Treasury and Agency Securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 0 | 0
Recurring | Significant Unobservable Inputs, Level 3 | Obligations of State and Political Subdivisions |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 0 | 0
Recurring | Significant Unobservable Inputs, Level 3 | Government Agency Mortgage-Backed Securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 0 | 0
Recurring | Significant Unobservable Inputs, Level 3 | Corporate debt securities |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | 0 | 0
Recurring | Significant Unobservable Inputs, Level 3 | Government Agency Collateralized Mortgage Obligations |  |
Available-for-sale investment securities |  |
Available-for-sale investment securities | $ 0 | $ 0

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