FAIR VALUE DISCLOSURES AND REPORTING, THE FAIR VALUE OPTION AND FAIR VALUE MEASUREMENTS - Fair Value of Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	$ 1,141,971	$ 1,257,101
Loans held for sale	5,960	4,443
Interest rate swap contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	14,869	12,825
Interest rate swaps	14,880	12,825
Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	1,141,971	1,257,101
Recurring basis | Interest rate swap contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	14,869	12,825
Interest rate swaps	14,880	12,825
U.S. Treasury | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	124,694	123,854
Obligations of U.S. Government agencies and sponsored entities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	125,364	144,369
Municipal securities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	419,678	457,857
Mortgage-backed securities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	433,956	490,139
Corporate obligations | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	37,279	40,882
Other | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	1,000
Quoted Prices (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	124,694	123,854
Loans held for sale	0	0
Quoted Prices (Level 1) | Interest rate swap contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	0	0
Interest rate swaps	0	0
Quoted Prices (Level 1) | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	124,694	123,854
Quoted Prices (Level 1) | Recurring basis | Interest rate swap contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	0	0
Interest rate swaps	0	0
Quoted Prices (Level 1) | U.S. Treasury | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	124,694	123,854
Quoted Prices (Level 1) | Obligations of U.S. Government agencies and sponsored entities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	0	0
Quoted Prices (Level 1) | Municipal securities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	0	0
Quoted Prices (Level 1) | Mortgage-backed securities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	0	0
Quoted Prices (Level 1) | Corporate obligations | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	0	0
Quoted Prices (Level 1) | Other | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	0
Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	997,753	1,118,099
Loans held for sale	5,960	4,443
Significant Other Observable Inputs (Level 2) | Interest rate swap contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	14,869	12,825
Interest rate swaps	14,869	12,825
Significant Other Observable Inputs (Level 2) | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	997,753	1,118,099
Significant Other Observable Inputs (Level 2) | Recurring basis | Interest rate swap contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	14,869	12,825
Interest rate swaps	14,869	12,825
Significant Other Observable Inputs (Level 2) | U.S. Treasury | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	0	0
Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government agencies and sponsored entities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	125,364	144,369
Significant Other Observable Inputs (Level 2) | Municipal securities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	400,185	442,740
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	433,956	490,139
Significant Other Observable Inputs (Level 2) | Corporate obligations | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	37,248	40,851
Significant Other Observable Inputs (Level 2) | Other | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	1,000
Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	19,524	15,148
Loans held for sale	0	0
Significant Unobservable Inputs (Level 3) | Interest rate swap contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	0	0
Interest rate swaps	11	0
Significant Unobservable Inputs (Level 3) | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	19,524	15,148
Significant Unobservable Inputs (Level 3) | Recurring basis | Interest rate swap contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	0	0
Interest rate swaps	11	0
Significant Unobservable Inputs (Level 3) | U.S. Treasury | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) | Obligations of U.S. Government agencies and sponsored entities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) | Municipal securities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	19,493	15,117
Significant Unobservable Inputs (Level 3) | Mortgage-backed securities | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) | Corporate obligations | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	31	$ 31
Significant Unobservable Inputs (Level 3) | Other | Recurring basis
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Securities available-for-sale	$ 0