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FAIR VALUE MEASUREMENT AND DISCLOSURE (Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets: |  |
Trading securities | $ 4,335 | $ 4,161
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 1,455,210 | 1,115,813
Loans held for sale | 10,789 | 40,499
Financial liabilities: |  |
Debt Securities, Trading | 4,335 | 4,161
Obligations of U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 8,452 |
Obligations of states and political subdivisions |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 117,753 | 127,120
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 919,992 | 566,618
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 392,827 | 410,454
Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Trading securities | 4,335 | 4,161
Loans held for sale | 10,826 | 41,557
Financial liabilities: |  |
Debt Securities, Trading | 4,335 | 4,161
Fair Value, Measurements, Recurring | Obligations of U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 8,452 |
Fair Value, Measurements, Recurring | Obligations of states and political subdivisions |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 117,753 | 127,120
Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 919,992 | 566,618
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 392,827 | 410,454
Fair Value, Measurements, Recurring | Corporate Bond Securities [Member] |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 16,186 | 11,621
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Trading securities | 4,335 | 4,161
Loans held for sale | 0 | 0
Financial liabilities: |  |
Debt Securities, Trading | 4,335 | 4,161
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Obligations of U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 0 |
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 0 | 0
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 0 | 0
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 0 | 0
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Corporate Bond Securities [Member] |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 0 | 0
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Trading securities | 0 | 0
Loans held for sale | 10,826 | 41,557
Financial liabilities: |  |
Debt Securities, Trading | 0 | 0
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Obligations of U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 8,452 |
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 117,753 | 127,120
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 919,992 | 566,618
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 392,827 | 410,454
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Corporate Bond Securities [Member] |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 16,186 | 11,621
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Trading securities | 0 | 0
Loans held for sale | 0 | 0
Financial liabilities: |  |
Debt Securities, Trading | 0 | 0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Obligations of U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 0 |
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 0 | 0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 0 | 0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 0 | 0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Corporate Bond Securities [Member] |  |
Financial assets: |  |
Available-for-sale securities, at fair value (book value of $1,443,800 and $1,078,474, respectively) | 0 | 0
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 498 | 608
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 116 | 248
Interest Rate Lock Commitments [Member] | Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 0 | 0
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value |  | 0
Interest Rate Lock Commitments [Member] | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 498 | 608
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 116 | 248
Interest Rate Lock Commitments [Member] | Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 0 | 0
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 0 | 0
Forward delivery commitments | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 215 | 311
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 22 | 196
Forward delivery commitments | Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 0 | 0
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value |  | 0
Forward delivery commitments | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 215 | 311
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 22 | 196
Forward delivery commitments | Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 0 | 0
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 0 | 0
Customer loan swaps | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 24,045 | 39,627
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 24,045 | 39,627
Customer loan swaps | Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 0 | 0
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 0 | 0
Customer loan swaps | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 24,045 | 39,627
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 24,045 | 39,627
Customer loan swaps | Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 0 | 0
Financial liabilities: |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 0 | 0
Interest rate contracts |  |
Financial assets: |  |
Fair Value | 6,849 | 5,731
Financial liabilities: |  |
Derivative Liability | 8,597 | 11,625
Interest rate contracts | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Fair Value | 6,849 | 5,731
Financial liabilities: |  |
Derivative Liability | 8,597 | 11,625
Interest rate contracts | Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Fair Value | 0 | 0
Financial liabilities: |  |
Derivative Liability |  | 0
Interest rate contracts | Observable Market Data (Level 2) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Fair Value | 6,849 | 5,731
Financial liabilities: |  |
Derivative Liability | 8,597 | 11,625
Interest rate contracts | Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring |  |
Financial assets: |  |
Fair Value | 0 | 0
Financial liabilities: |  |
Derivative Liability | $ 0 | $ 0

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