Quarterly report [Sections 13 or 15(d)]

COMMITMENTS AND CONTINGENCIES (Schedule of Securities Pledged as Collateral) (Details)

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COMMITMENTS AND CONTINGENCIES (Schedule of Securities Pledged as Collateral) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
AFS Securities $ 2,483,835 $ 2,442,166
HTM securities 772,412 759,335
Loans 18,233,893 18,291,977
Total assets 24,632,611 24,585,323
Asset Pledged as Collateral [Member]    
Cash 103,900 134,668
AFS Securities 1,518,822 1,526,012
HTM securities 604,736 610,838
Loans 8,078,751 8,447,750
Total assets 10,306,209 10,719,268
Deposits [Member] | Asset Pledged as Collateral [Member]    
Cash 0 0
AFS Securities 772,731 771,486
HTM securities 595,193 601,421
Loans 0 0
Total assets 1,367,924 1,372,907
Repurchase Agreements [Member] | Asset Pledged as Collateral [Member]    
Cash 0 0
AFS Securities 93,558 93,667
HTM securities 0 0
Loans 0 0
Total assets 93,558 93,667
Federal Home Loan Bank Advances [Member] | Asset Pledged as Collateral [Member]    
Cash 0 0
AFS Securities 571,632 579,947
HTM securities 9,543 9,417
Loans 3,998,576 4,089,049
Total assets 4,579,751 4,678,413
Derivative [Member] | Asset Pledged as Collateral [Member]    
Cash 103,900 134,668
AFS Securities 62,860 62,199
HTM securities 0 0
Loans 0 0
Total assets 166,760 196,867
Federal Reserve Discount Window | Asset Pledged as Collateral [Member]    
Cash 0 0
AFS Securities 0 0
HTM securities 0 0
Loans 4,080,175 4,358,701
Total assets 4,080,175 4,358,701
Other purposes | Asset Pledged as Collateral [Member]    
Cash 0 0
AFS Securities 18,041 18,713
HTM securities 0 0
Loans 0 0
Total assets $ 18,041 $ 18,713