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, 2026
Dec. 31, 2025
Financial Instruments Owned and Pledged as Collateral [Line Items]    
AFS Securities $ 4,011,410 $ 4,194,301
HTM securities 834,832 856,812
Loans 27,655,324 27,501,059
Total assets 37,315,011 37,585,754
Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 133,861 120,697
AFS Securities 2,106,563 2,100,229
HTM securities 583,258 616,547
Loans 12,157,446 12,196,030
Total assets 14,981,128 15,033,503
Deposits [Member] | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
AFS Securities 1,270,127 1,249,969
HTM securities 573,869 607,061
Loans 0 0
Total assets 1,843,996 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 195,429 203,404
HTM securities 0 0
Loans 0 0
Total assets 195,429 203,404
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 497,702 518,895
HTM securities 9,389 9,486
Loans 8,988,127 8,832,269
Total assets 9,495,218 9,360,650
Derivative [Member] | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 133,861 120,697
AFS Securities 64,182 64,037
HTM securities 0 0
Loans 0 0
Total assets 198,043 184,734
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 3,169,319 3,363,761
Total assets 3,169,319 3,363,761
Other purposes | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
AFS Securities 79,123 63,924
HTM securities 0 0
Loans 0 0
Total assets $ 79,123 $ 63,924