Quarterly report [Sections 13 or 15(d)]

FAIR VALUE MEASUREMENTS (Carrying Values and Estimated Fair Values of the Company's Financial Instruments) (Details)

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FAIR VALUE MEASUREMENTS (Carrying Values and Estimated Fair Values of the Company's Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
ASSETS    
Cash and cash equivalents $ 700,761 $ 966,462
AFS Securities 3,748,965 4,194,301
HTM securities 762,246 856,812
Restricted stock 190,101 190,200
LHFS 16,825 18,486
LHFI, net of unearned income 28,853,785 27,517,137
Financial Derivatives 177,551 112,686
Accrued interest receivable 129,229 131,741
Bank owned life insurance 683,224 672,890
LIABILITIES    
Deposits 30,947,823 30,467,372
Borrowings 1,592,353 1,435,699
Accrued interest payable 21,128 19,412
Financial Derivatives 249,758 166,690
Fair Value, Inputs, Level 1 [Member]    
ASSETS    
Cash and cash equivalents 700,761 966,462
AFS Securities 89,383 88,946
HTM securities 0 0
Restricted stock 0 0
LHFS 0 0
LHFI, net of unearned income 0 0
Financial Derivatives 0 0
Accrued interest receivable 0 0
Bank owned life insurance 0 0
LIABILITIES    
Deposits 0 0
Borrowings 0 0
Accrued interest payable 0 0
Financial Derivatives 0 0
Fair Value, Inputs, Level 2 [Member]    
ASSETS    
Cash and cash equivalents 0 0
AFS Securities 3,659,582 4,105,355
HTM securities 761,390 855,906
Restricted stock 190,101 190,200
LHFS 16,825 18,486
LHFI, net of unearned income 0 0
Financial Derivatives 177,551 112,686
Accrued interest receivable 129,229 131,741
Bank owned life insurance 683,224 672,890
LIABILITIES    
Deposits 30,947,823 30,467,372
Borrowings 1,592,353 1,435,699
Accrued interest payable 21,128 19,412
Financial Derivatives 249,758 166,690
Fair Value, Inputs, Level 3 [Member]    
ASSETS    
Cash and cash equivalents 0 0
AFS Securities 0 0
HTM securities 856 906
Restricted stock 0 0
LHFS 0 0
LHFI, net of unearned income 28,853,785 27,517,137
Financial Derivatives 0 0
Accrued interest receivable 0 0
Bank owned life insurance 0 0
LIABILITIES    
Deposits 0 0
Borrowings 0 0
Accrued interest payable 0 0
Financial Derivatives 0 0
Reported Value Measurement [Member]    
ASSETS    
Cash and cash equivalents 700,761 966,462
AFS Securities 3,748,965 4,194,301
HTM securities 845,326 884,216
Restricted stock 190,101 190,200
LHFS 16,825 18,486
LHFI, net of unearned income 29,296,616 27,796,167
Financial Derivatives 177,551 112,686
Accrued interest receivable 129,229 131,741
Bank owned life insurance 683,224 672,890
LIABILITIES    
Deposits 30,965,529 30,471,636
Borrowings 1,622,403 1,497,292
Accrued interest payable 21,128 19,412
Financial Derivatives $ 249,758 $ 166,690