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
Sep. 30, 2026
Dec. 31, 2025
Financial Instruments Owned and Pledged as Collateral [Line Items]    
AFS Securities $ 3,748,965 $ 4,194,301
HTM securities 762,246 856,812
Loans 28,995,184 27,501,059
Total assets 38,351,665 37,585,754
Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 40,091 124,667
AFS Securities 1,942,683 2,100,229
HTM securities 541,224 616,547
Loans 10,329,107 12,196,030
Total assets 12,853,105 15,037,473
Deposits [Member] | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
AFS Securities 1,156,521 1,249,969
HTM securities 532,507 607,061
Loans 0 0
Total assets 1,689,028 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 194,644 203,404
HTM securities 0 0
Loans 0 0
Total assets 194,644 203,404
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 446,736 518,895
HTM securities 8,717 9,486
Loans 8,303,325 8,832,269
Total assets 8,758,778 9,360,650
Derivative [Member] | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 40,091 124,667
AFS Securities 64,683 64,037
HTM securities 0 0
Loans 0 0
Total assets 104,774 188,704
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 2,025,782 3,363,761
Total assets 2,025,782 3,363,761
Other purposes | Asset Pledged as Collateral [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
AFS Securities 80,099 63,924
HTM securities 0 0
Loans 0 0
Total assets $ 80,099 $ 63,924