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FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 310,985 | $ 228,896
Securities held-to-maturity | 250,285 | 262,460
Securities available-for-sale | 915,054 | 868,297
Federal Home Loan Bank and other bank stock | 60,336 | 57,092
Loans receivable, net of allowance for credit losses | 6,261,148 | 6,526,916
Accrued interest receivable | 39,494 | 37,942
Derivative assets | 70,625 | 2,292
Financial liabilities |  |
Deposits | 6,631,697 | 7,107,357
Advances from Federal Home Loan Bank and Federal Reserve Bank borrowings | 974,319 | 699,730
Other borrowings | 185,802 |
Long-term debt | 261,313 | 269,673
Derivative liabilities(1) | 2,799 | 2,251
Accrued interest payable | 21,187 | 7,004
Fair value Measurement Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 310,985 | 228,896
Securities held-to-maturity | 0 | 0
Securities available-for-sale | 0 | 0
Federal Home Loan Bank and other bank stock | 0 | 0
Loans receivable, net of allowance for credit losses | 0 | 0
Accrued interest receivable | 39,494 | 37,942
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 5,054,976 | 5,931,500
Advances from Federal Home Loan Bank and Federal Reserve Bank borrowings | 0 | 0
Other borrowings | 0 |
Long-term debt | 0 | 0
Derivative liabilities(1) | 0 | 0
Accrued interest payable | 21,187 | 7,004
Fair value Measurement Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities held-to-maturity | 250,285 | 262,460
Securities available-for-sale | 915,054 | 868,297
Federal Home Loan Bank and other bank stock | 60,336 | 57,092
Loans receivable, net of allowance for credit losses | 0 | 0
Accrued interest receivable | 0 | 0
Derivative assets | 70,625 | 2,292
Financial liabilities |  |
Deposits | 1,576,721 | 1,175,857
Advances from Federal Home Loan Bank and Federal Reserve Bank borrowings | 974,319 | 699,730
Other borrowings | 185,802 |
Long-term debt | 261,313 | 269,673
Derivative liabilities(1) | 2,799 | 2,251
Accrued interest payable | 0 | 0
Fair value Measurement Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities held-to-maturity | 0 | 0
Securities available-for-sale | 0 | 0
Federal Home Loan Bank and other bank stock | 0 | 0
Loans receivable, net of allowance for credit losses | 6,261,148 | 6,526,916
Accrued interest receivable | 0 | 0
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 0 | 0
Advances from Federal Home Loan Bank and Federal Reserve Bank borrowings | 0 | 0
Other borrowings | 0 |
Long-term debt | 0 | 0
Derivative liabilities(1) | 0 | 0
Accrued interest payable | 0 | 0
Carrying Value |  |
Financial assets |  |
Cash and cash equivalents | 310,985 | 228,896
Securities held-to-maturity | 328,287 | 328,641
Securities available-for-sale | 915,054 | 868,297
Federal Home Loan Bank and other bank stock | 60,336 | 57,092
Loans receivable, net of allowance for credit losses | 6,886,642 | 7,029,078
Accrued interest receivable | 39,494 | 37,942
Derivative assets | 70,625 | 2,292
Financial liabilities |  |
Deposits | 6,640,630 | 7,120,921
Advances from Federal Home Loan Bank and Federal Reserve Bank borrowings | 1,008,293 | 727,348
Other borrowings | 185,802 |
Long-term debt | 274,279 | 274,906
Derivative liabilities(1) | 2,799 | 2,251
Accrued interest payable | $ 21,187 | $ 7,004

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