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DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Assets: |  |
Cash and cash equivalents, Carrying Amount | $ 3,048,587 | $ 3,846,346
Cash and cash equivalents, Estimated Fair Value | 3,048,587 | 3,846,346
Debt securities, available for sale | 2,477,758 | 2,376,860
Debt securities, held to maturity | 962,799 | 1,103,170
Debt securities, held to maturity, fair value | 908,075 | 1,046,439
Loans held for sale | 375,724 | 340,317
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Carrying Amount | 13,124,479 | 12,726,456
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 12,817,379 | 12,513,386
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount | 92,276 | 109,548
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 92,276 | 109,548
Derivative assets | 20,292 | 17,931
Liabilities: |  |
Deposits, Carrying Amount | 17,678,093 | 17,920,236
Deposits, Estimated Fair Value | 17,672,062 | 17,922,005
FHLB advances, Carrying Amount | 1,018,349 | 1,203,207
FHLB advances, Estimated Fair Value | 993,579 | 1,188,517
Other borrowings, Carrying Amount | 123,970 | 123,840
Other borrowings, Estimated Fair Value | 102,945 | 103,674
Subordinated debt, Carrying Amount | 182,370 | 182,230
Subordinated debt, Estimated Fair Value | 161,420 | 164,233
Derivative liabilities | 29,108 | 27,110
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents, Estimated Fair Value | 3,048,587 | 3,846,346
Debt securities, available for sale | 0 | 0
Debt securities, held to maturity, fair value | 0 | 0
Loans held for sale | 0 | 0
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 0 | 0
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 0 | 0
Derivative assets | 0 | 0
Liabilities: |  |
Deposits, Estimated Fair Value | 15,482,394 | 14,632,357
FHLB advances, Estimated Fair Value | 0 | 0
Other borrowings, Estimated Fair Value | 0 | 0
Subordinated debt, Estimated Fair Value | 0 | 0
Derivative liabilities | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash and cash equivalents, Estimated Fair Value | 0 | 0
Debt securities, available for sale | 2,455,896 | 2,341,911
Debt securities, held to maturity, fair value | 462,372 | 472,311
Loans held for sale | 2,684 | 1,215
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 1,002,711 | 897,912
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 92,276 | 109,548
Derivative assets | 20,180 | 17,906
Liabilities: |  |
Deposits, Estimated Fair Value | 2,189,668 | 3,289,648
FHLB advances, Estimated Fair Value | 993,579 | 1,188,517
Other borrowings, Estimated Fair Value | 102,945 | 103,674
Subordinated debt, Estimated Fair Value | 161,420 | 164,233
Derivative liabilities | 29,108 | 27,110
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents, Estimated Fair Value | 0 | 0
Debt securities, available for sale | 21,862 | 34,949
Debt securities, held to maturity, fair value | 445,703 | 574,128
Loans held for sale | 373,040 | 339,102
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 11,814,668 | 11,615,474
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 0 | 0
Derivative assets | 112 | 25
Liabilities: |  |
Deposits, Estimated Fair Value | 0 | 0
FHLB advances, Estimated Fair Value | 0 | 0
Other borrowings, Estimated Fair Value | 0 | 0
Subordinated debt, Estimated Fair Value | 0 | 0
Derivative liabilities | $ 0 | $ 0

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