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COMMITMENTS AND CONTINGENCIES (Balances of Commitments and Contingencies) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Commitments with off-balance sheet risk: |  |
Total commitments with off-balance sheet risk | $ 5,711,586 | $ 4,884,239
Commitments to Extend Credit |  |
Commitments with off-balance sheet risk: |  |
Total commitments with off-balance sheet risk | 5,550,942 | 4,722,412
Standby Letters of Credit |  |
Commitments with off-balance sheet risk: |  |
Total commitments with off-balance sheet risk | $ 160,644 | $ 161,827

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- Definition Commitments with Off Balance Sheet Risk [Abstract] + References No definition available. + Details
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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + 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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