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FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 220,819 | $ 373,472
Securities available-for-sale | 1,231,431 | 912,580
Federal Home Loan Bank and other bank stock | 44,506 | 59,420
Loans held-for-sale | 1,413 | 22,642
Loans receivable, net of allowance | 5,936,708 | 5,894,732
Accrued interest receivable | 29,445 | 24,523
Derivative assets | 7,632 | 3,583
Financial liabilities |  |
Deposits | 6,087,714 | 5,430,536
Advances from Federal Home Loan Bank | 585,416 | 1,222,709
Long-term debt | 273,230 | 180,213
Derivative liabilities | 8,102 | 3,853
Accrued interest payable | 3,714 | 4,687
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets |  |
Cash and cash equivalents | 220,819 | 373,472
Securities available-for-sale | 0 | 0
Federal Home Loan Bank and other bank stock | 0 | 0
Loans held-for-sale | 0 | 0
Loans receivable, net of allowance | 0 | 0
Accrued interest receivable | 29,445 | 24,523
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 0 | 0
Advances from Federal Home Loan Bank | 0 | 0
Long-term debt | 0 | 0
Derivative liabilities | 0 | 0
Accrued interest payable | 3,714 | 4,687
Significant Other Observable Inputs (Level 2) |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities available-for-sale | 1,231,431 | 912,580
Federal Home Loan Bank and other bank stock | 44,506 | 59,420
Loans held-for-sale | 468 | 3,409
Loans receivable, net of allowance | 0 | 0
Accrued interest receivable | 0 | 0
Derivative assets | 7,632 | 3,583
Financial liabilities |  |
Deposits | 0 | 0
Advances from Federal Home Loan Bank | 585,416 | 1,222,709
Long-term debt | 273,230 | 180,213
Derivative liabilities | 8,102 | 3,853
Accrued interest payable | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities available-for-sale | 0 | 0
Federal Home Loan Bank and other bank stock | 0 | 0
Loans held-for-sale | 945 | 19,233
Loans receivable, net of allowance | 5,936,708 | 5,894,732
Accrued interest receivable | 0 | 0
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 6,087,714 | 5,430,536
Advances from Federal Home Loan Bank | 0 | 0
Long-term debt | 0 | 0
Derivative liabilities | 0 | 0
Accrued interest payable | 0 | 0
Carrying Value |  |
Financial assets |  |
Cash and cash equivalents | 220,819 | 373,472
Securities available-for-sale | 1,231,431 | 912,580
Federal Home Loan Bank and other bank stock | 44,506 | 59,420
Loans held-for-sale | 1,413 | 22,642
Loans receivable, net of allowance | 5,817,375 | 5,894,236
Accrued interest receivable | 29,445 | 24,523
Derivative assets | 7,632 | 3,583
Financial liabilities |  |
Deposits | 6,085,800 | 5,427,167
Advances from Federal Home Loan Bank | 539,795 | 1,195,000
Long-term debt | 256,315 | 173,421
Derivative liabilities | 8,102 | 3,853
Accrued interest payable | $ 3,714 | $ 4,687

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- Definition Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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