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
Mar. 31, 2026
Dec. 31, 2025
ASSETS    
Cash and cash equivalents $ 780,128 $ 966,462
AFS Securities 4,011,410 4,194,301
HTM securities 834,832 856,812
Restricted stock 177,513 190,200
LHFS 20,776 18,486
LHFI, net of unearned income 27,700,544 27,517,137
Financial Derivatives 100,932 112,686
Accrued interest receivable 125,605 131,741
Bank owned life insurance 675,816 672,890
LIABILITIES    
Deposits 30,379,039 30,467,372
Borrowings 1,266,759 1,435,699
Accrued interest payable 19,660 19,412
Financial Derivatives 157,130 166,690
Fair Value, Inputs, Level 1 [Member]    
ASSETS    
Cash and cash equivalents 780,128 966,462
AFS Securities 88,830 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 3,922,580 4,105,355
HTM securities 833,938 855,906
Restricted stock 177,513 190,200
LHFS 20,776 18,486
LHFI, net of unearned income 0 0
Financial Derivatives 100,932 112,686
Accrued interest receivable 125,605 131,741
Bank owned life insurance 675,816 672,890
LIABILITIES    
Deposits 30,379,039 30,467,372
Borrowings 1,266,759 1,435,699
Accrued interest payable 19,660 19,412
Financial Derivatives 157,130 166,690
Fair Value, Inputs, Level 3 [Member]    
ASSETS    
Cash and cash equivalents 0 0
AFS Securities 0 0
HTM securities 894 906
Restricted stock 0 0
LHFS 0 0
LHFI, net of unearned income 27,700,544 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 780,128 966,462
AFS Securities 4,011,410 4,194,301
HTM securities 870,288 884,216
Restricted stock 177,513 190,200
LHFS 20,776 18,486
LHFI, net of unearned income 27,946,424 27,796,167
Financial Derivatives 100,932 112,686
Accrued interest receivable 125,605 131,741
Bank owned life insurance 675,816 672,890
LIABILITIES    
Deposits 30,391,256 30,471,636
Borrowings 1,304,587 1,497,292
Accrued interest payable 19,660 19,412
Financial Derivatives $ 157,130 $ 166,690