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FAIR VALUE MEASUREMENT - Fair Value, Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Carrying Amount |  |
Financial Assets |  |
Cash and cash equivalents | $ 560,510 | $ 199,252
Investment securities: |  |
HTM, at carrying value | 1,186,152 | 1,190,108
Mortgage-backed securities: |  |
HTM, at carrying value | 120,901 | 136,621
FHLB stock, at cost | 11,936 | 9,190
Equity investments | 4,383 | 5,946
Loans, net of allowance for loan losses | 4,481,836 | 4,111,176
Loans held for sale | 10,894 | 667
Financial Liabilities: |  |
Deposits | 6,549,681 | 6,198,019
Other borrowings | 509,820 | 221,153
FHLB borrowings | 212,648 | 153,358
Subordinated notes, net of unamortized debt issuance costs | 93,877 | 98,674
Trust preferred subordinated debentures, net of unamortized debt issuance costs | 60,270 | 60,265
Estimated Fair Value |  |
Financial Assets |  |
Cash and cash equivalents | 560,510 | 199,252
Investment securities: |  |
HTM, at carrying value | 1,054,739 | 1,023,376
Mortgage-backed securities: |  |
HTM, at carrying value | 111,423 | 125,780
FHLB stock, at cost | 11,936 | 9,190
Equity investments | 4,383 | 5,946
Loans, net of allowance for loan losses | 4,198,879 | 3,880,664
Loans held for sale | 10,894 | 667
Financial Liabilities: |  |
Deposits | 6,534,929 | 6,158,517
Other borrowings | 510,242 | 221,153
FHLB borrowings | 202,750 | 140,976
Subordinated notes, net of unamortized debt issuance costs | 86,285 | 91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs | 57,480 | 60,594
Estimated Fair Value | Level 1 |  |
Financial Assets |  |
Cash and cash equivalents | 560,510 | 199,252
Investment securities: |  |
HTM, at carrying value | 0 | 0
Mortgage-backed securities: |  |
HTM, at carrying value | 0 | 0
FHLB stock, at cost | 0 | 0
Equity investments | 0 | 0
Loans, net of allowance for loan losses | 0 | 0
Loans held for sale | 0 | 0
Financial Liabilities: |  |
Deposits | 0 | 0
Other borrowings | 0 | 0
FHLB borrowings | 0 | 0
Subordinated notes, net of unamortized debt issuance costs | 0 | 0
Trust preferred subordinated debentures, net of unamortized debt issuance costs | 0 | 0
Estimated Fair Value | Level 2 |  |
Financial Assets |  |
Cash and cash equivalents | 0 | 0
Investment securities: |  |
HTM, at carrying value | 1,054,739 | 1,023,376
Mortgage-backed securities: |  |
HTM, at carrying value | 111,423 | 125,780
FHLB stock, at cost | 11,936 | 9,190
Equity investments | 4,383 | 5,946
Loans, net of allowance for loan losses | 0 | 0
Loans held for sale | 10,894 | 667
Financial Liabilities: |  |
Deposits | 6,534,929 | 6,158,517
Other borrowings | 510,242 | 221,153
FHLB borrowings | 202,750 | 140,976
Subordinated notes, net of unamortized debt issuance costs | 86,285 | 91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs | 57,480 | 60,594
Estimated Fair Value | Level 3 |  |
Financial Assets |  |
Cash and cash equivalents | 0 | 0
Investment securities: |  |
HTM, at carrying value | 0 | 0
Mortgage-backed securities: |  |
HTM, at carrying value | 0 | 0
FHLB stock, at cost | 0 | 0
Equity investments | 0 | 0
Loans, net of allowance for loan losses | 4,198,879 | 3,880,664
Loans held for sale | 0 | 0
Financial Liabilities: |  |
Deposits | 0 | 0
Other borrowings | 0 | 0
FHLB borrowings | 0 | 0
Subordinated notes, net of unamortized debt issuance costs | 0 | 0
Trust preferred subordinated debentures, net of unamortized debt issuance costs | $ 0 | $ 0

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