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FAIR VALUE MEASUREMENTS - Schedule of financial assets and financial liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Financial assets and financial liabilities measured at fair value |  |
Fair Value | $ 2,087,571 | $ 2,461,393
Equity securities | 9,812 | 11,535
U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 15,946 | 114,061
Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 5,832 | 19,779
Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 172,845 | 257,512
Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 468,223 | 469,875
Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 103,509 | 108,394
Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 1,111,312 | 1,243,256
Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 209,904 | 248,516
Fair Value, Recurring | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative assets | 30,008 | 42,612
Fair Value, Recurring | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative liabilities | 54,132 | 72,462
Fair Value, Recurring | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 15,946 | 114,061
Fair Value, Recurring | Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 5,832 | 19,779
Fair Value, Recurring | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 172,845 | 257,512
Fair Value, Recurring | Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 468,223 | 469,875
Fair Value, Recurring | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 103,509 | 108,394
Fair Value, Recurring | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 1,111,312 | 1,243,256
Fair Value, Recurring | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 209,904 | 248,516
Fair Value, Recurring | Equity securities |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 9,812 | 11,535
Fair Value, Recurring | Level 1 Inputs | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative assets | 0 | 0
Fair Value, Recurring | Level 1 Inputs | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative liabilities | 0 | 0
Fair Value, Recurring | Level 1 Inputs | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 1 Inputs | Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 1 Inputs | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 1 Inputs | Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 1 Inputs | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 1 Inputs | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 1 Inputs | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 1 Inputs | Equity securities |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 448 | 0
Fair Value, Recurring | Level 2 Inputs | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative assets | 29,993 | 42,607
Fair Value, Recurring | Level 2 Inputs | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative liabilities | 54,132 | 72,462
Fair Value, Recurring | Level 2 Inputs | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 15,946 | 114,061
Fair Value, Recurring | Level 2 Inputs | Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 5,832 | 19,779
Fair Value, Recurring | Level 2 Inputs | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 172,845 | 257,512
Fair Value, Recurring | Level 2 Inputs | Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 468,223 | 469,875
Fair Value, Recurring | Level 2 Inputs | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 103,509 | 108,394
Fair Value, Recurring | Level 2 Inputs | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 1,111,312 | 1,243,256
Fair Value, Recurring | Level 2 Inputs | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 209,904 | 248,516
Fair Value, Recurring | Level 2 Inputs | Equity securities |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 9,364 | 11,535
Fair Value, Recurring | Level 3 Inputs | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative assets | 15 | 5
Fair Value, Recurring | Level 3 Inputs | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative liabilities | 0 | 0
Fair Value, Recurring | Level 3 Inputs | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 3 Inputs | Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 3 Inputs | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 3 Inputs | Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 3 Inputs | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 3 Inputs | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 3 Inputs | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 0 | 0
Fair Value, Recurring | Level 3 Inputs | Equity securities |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | $ 0 | $ 0

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