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, 2025
Dec. 31, 2024
ASSETS    
Cash and cash equivalents $ 434,138 $ 354,074
AFS Securities 2,483,835 2,442,166
HTM securities 772,412 759,335
Restricted stock 100,312 102,954
LHFS 9,525 9,420
LHFI, net of deferred fees and costs 17,846,081 17,896,688
Financial Derivatives 94,883 97,445
Accrued interest receivable 89,177 92,541
Bank owned life insurance 496,933 493,396
LIABILITIES    
Deposits 20,492,575 20,393,673
Borrowings 415,347 471,671
Accrued interest payable 27,944 26,214
Financial Derivatives 176,420 199,548
Fair Value, Inputs, Level 1 [Member]    
ASSETS    
Cash and cash equivalents 434,138 354,074
AFS Securities 62,860 62,199
HTM securities 0 0
Restricted stock 0 0
LHFS 0 0
LHFI, net of deferred fees and costs 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 2,420,975 2,379,967
HTM securities 771,489 758,400
Restricted stock 100,312 102,954
LHFS 9,525 9,420
LHFI, net of deferred fees and costs 0 0
Financial Derivatives 94,883 97,445
Accrued interest receivable 89,177 92,541
Bank owned life insurance 496,933 493,396
LIABILITIES    
Deposits 20,492,575 20,393,673
Borrowings 415,347 471,671
Accrued interest payable 27,944 26,214
Financial Derivatives 176,420 199,548
Fair Value, Inputs, Level 3 [Member]    
ASSETS    
Cash and cash equivalents 0 0
AFS Securities 0 0
HTM securities 923 935
Restricted stock 0 0
LHFS 0 0
LHFI, net of deferred fees and costs 17,846,081 17,896,688
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 434,138 354,074
AFS Securities 2,483,835 2,442,166
HTM securities 821,059 803,851
Restricted stock 100,312 102,954
LHFS 9,525 9,420
LHFI, net of deferred fees and costs 18,427,689 18,470,621
Financial Derivatives 94,883 97,445
Accrued interest receivable 89,177 92,541
Bank owned life insurance 496,933 493,396
LIABILITIES    
Deposits 20,502,874 20,397,619
Borrowings 475,685 534,578
Accrued interest payable 27,944 26,214
Financial Derivatives $ 176,420 $ 199,548