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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, 2022 | Dec. 31, 2021
--- | --- | ---
Financial assets and financial liabilities measured at fair value |  |
Fair Value | $ 2,461,393 | $ 3,981,251
Equity securities | 11,535 | 13,571
Loans held for sale | 1,253 | 23,875
U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 114,061 | 165,762
Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 19,779 | 38,470
Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 257,512 | 306,869
Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 469,875 | 492,186
Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 108,394 | 614,998
Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 1,243,256 | 2,069,313
Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 248,516 | 293,653
Fair Value, Recurring |  |
Financial assets and financial liabilities measured at fair value |  |
Loans held for sale |  | 23,875
Fair Value, Recurring | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative assets | 42,612 | 20,314
Fair Value, Recurring | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative liabilities | 72,462 | 21,501
Fair Value, Recurring | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 114,061 | 165,762
Fair Value, Recurring | Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 19,779 | 38,470
Fair Value, Recurring | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 257,512 | 306,869
Fair Value, Recurring | Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 469,875 | 492,186
Fair Value, Recurring | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 108,394 | 614,998
Fair Value, Recurring | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 1,243,256 | 2,069,313
Fair Value, Recurring | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 248,516 | 293,653
Fair Value, Recurring | Equity securities |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 11,535 | 13,571
Fair Value, Recurring | Level 1 Inputs |  |
Financial assets and financial liabilities measured at fair value |  |
Loans held for sale |  | 0
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 | 0 | 0
Fair Value, Recurring | Level 2 Inputs |  |
Financial assets and financial liabilities measured at fair value |  |
Loans held for sale |  | 23,875
Fair Value, Recurring | Level 2 Inputs | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative assets | 42,607 | 20,314
Fair Value, Recurring | Level 2 Inputs | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative liabilities | 72,462 | 21,501
Fair Value, Recurring | Level 2 Inputs | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 114,061 | 165,762
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 | 19,779 | 38,470
Fair Value, Recurring | Level 2 Inputs | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 257,512 | 306,869
Fair Value, Recurring | Level 2 Inputs | Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 469,875 | 492,186
Fair Value, Recurring | Level 2 Inputs | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 108,394 | 614,998
Fair Value, Recurring | Level 2 Inputs | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 1,243,256 | 2,069,313
Fair Value, Recurring | Level 2 Inputs | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair Value | 248,516 | 293,653
Fair Value, Recurring | Level 2 Inputs | Equity securities |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 11,535 | 13,571
Fair Value, Recurring | Level 3 Inputs |  |
Financial assets and financial liabilities measured at fair value |  |
Loans held for sale |  | 0
Fair Value, Recurring | Level 3 Inputs | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative assets | 5 | 0
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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