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
Jun. 30, 2026
Dec. 31, 2025
Financial Instruments Owned and Pledged as Collateral [Line Items]    
AFS Securities $ 3,876,717 $ 4,194,301
HTM securities 831,764 856,812
Loans 28,374,515 27,501,059
Total assets 38,099,868 37,585,754
Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 140,400 120,697
AFS Securities 2,082,365 2,100,229
HTM securities 585,365 616,547
Loans 11,000,454 12,196,030
Total assets 13,808,584 15,033,503
Deposits [Member] | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
AFS Securities 1,240,053 1,249,969
HTM securities 576,065 607,061
Loans 0 0
Total assets 1,816,118 1,857,030
Repurchase Agreements [Member] | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
AFS Securities 211,584 203,404
HTM securities 0 0
Loans 0 0
Total assets 211,584 203,404
Federal Home Loan Bank Advances [Member] | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
AFS Securities 479,753 518,895
HTM securities 9,300 9,486
Loans 8,816,031 8,832,269
Total assets 9,305,084 9,360,650
Derivative [Member] | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 140,400 120,697
AFS Securities 64,405 64,037
HTM securities 0 0
Loans 0 0
Total assets 204,805 184,734
Federal Reserve Discount Window | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
AFS Securities 0 0
HTM securities 0 0
Loans 2,184,423 3,363,761
Total assets 2,184,423 3,363,761
Other purposes | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
AFS Securities 86,570 63,924
HTM securities 0 0
Loans 0 0
Total assets $ 86,570 $ 63,924