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
Jun. 30, 2026
Dec. 31, 2025
ASSETS    
Cash and cash equivalents $ 990,297 $ 966,462
AFS Securities 3,876,717 4,194,301
HTM securities 831,764 856,812
Restricted stock 204,351 190,200
LHFS 23,074 18,486
LHFI, net of unearned income 28,419,826 27,517,137
Financial Derivatives 92,957 112,686
Accrued interest receivable 127,556 131,741
Bank owned life insurance 679,507 672,890
LIABILITIES    
Deposits 30,453,081 30,467,372
Borrowings 1,857,026 1,435,699
Accrued interest payable 17,454 19,412
Financial Derivatives 152,093 166,690
Fair Value, Inputs, Level 1 [Member]    
ASSETS    
Cash and cash equivalents 990,297 966,462
AFS Securities 89,077 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 3,787,640 4,105,355
HTM securities 830,883 855,906
Restricted stock 204,351 190,200
LHFS 23,074 18,486
LHFI, net of unearned income 0 0
Financial Derivatives 92,957 112,686
Accrued interest receivable 127,556 131,741
Bank owned life insurance 679,507 672,890
LIABILITIES    
Deposits 30,453,081 30,467,372
Borrowings 1,857,026 1,435,699
Accrued interest payable 17,454 19,412
Financial Derivatives 152,093 166,690
Fair Value, Inputs, Level 3 [Member]    
ASSETS    
Cash and cash equivalents 0 0
AFS Securities 0 0
HTM securities 881 906
Restricted stock 0 0
LHFS 0 0
LHFI, net of unearned income 28,419,826 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 990,297 966,462
AFS Securities 3,876,717 4,194,301
HTM securities 860,906 884,216
Restricted stock 204,351 190,200
LHFS 23,074 18,486
LHFI, net of unearned income 28,673,271 27,796,167
Financial Derivatives 92,957 112,686
Accrued interest receivable 127,556 131,741
Bank owned life insurance 679,507 672,890
LIABILITIES    
Deposits 30,468,257 30,471,636
Borrowings 1,881,340 1,497,292
Accrued interest payable 17,454 19,412
Financial Derivatives $ 152,093 $ 166,690