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DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Cash and cash equivalents, Carrying Amount | $ 4,185,639 | $ 3,785,931
Cash and cash equivalents, Estimated Fair Value | 4,185,639 | 3,785,931
Debt securities, available for sale | 1,979,832 | 1,985,438
Debt securities, held to maturity | 801,324 | 991,937
Debt securities, held to maturity, fair value | 757,130 | 934,677
Loans held for sale | 30,897 | 204,794
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Carrying Amount | 16,120,441 | 14,311,987
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 15,831,500 | 14,104,884
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount | 103,290 | 96,214
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 103,290 | 96,214
Derivatives | 12,631 | 15,263
Liabilities: |  |
Deposits, Carrying Amount | 20,405,023 | 18,846,461
Deposits, Estimated Fair Value | 20,431,102 | 18,842,810
FHLB advances, Carrying Amount | 1,195,437 | 1,128,352
FHLB advances, Estimated Fair Value | 1,197,611 | 1,103,324
Other borrowings, Carrying Amount | 99,173 | 99,068
Other borrowings, Estimated Fair Value | 87,336 | 88,000
Subordinated debt, Carrying Amount | 182,718 | 182,509
Subordinated debt, Estimated Fair Value | 174,181 | 167,601
Derivative liabilities | 17,430 | 22,570
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents, Estimated Fair Value | 4,185,639 | 3,785,931
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
Derivatives | 0 | 0
Liabilities: |  |
Deposits, Estimated Fair Value | 17,325,220 | 16,138,256
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 | 1,697,993 | 1,972,202
Debt securities, held to maturity, fair value | 456,455 | 461,307
Loans held for sale | 2,229 | 1,836
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 1,486,978 | 1,321,128
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 103,290 | 96,214
Derivatives | 12,613 | 15,223
Liabilities: |  |
Deposits, Estimated Fair Value | 3,105,882 | 2,704,554
FHLB advances, Estimated Fair Value | 1,197,611 | 1,103,324
Other borrowings, Estimated Fair Value | 87,336 | 88,000
Subordinated debt, Estimated Fair Value | 174,181 | 167,601
Derivative liabilities | 17,430 | 22,570
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents, Estimated Fair Value | 0 | 0
Debt securities, available for sale | 281,839 | 13,236
Debt securities, held to maturity, fair value | 300,675 | 473,370
Loans held for sale | 28,668 | 202,958
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 14,344,522 | 12,783,756
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 0 | 0
Derivatives | 18 | 40
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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