Quarterly report pursuant to Section 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, 2024
Dec. 31, 2023
AFS Securities $ 2,202,216 $ 2,231,261
HTM securities 791,345 808,074
Loans 15,715,438 15,502,861
Total assets 21,378,120 21,166,197
Asset Pledged as Collateral [Member]    
Cash 156,891 154,382
AFS Securities 1,078,259 1,460,754
HTM securities 615,378 638,850
Loans 3,639,590 3,379,394
Total assets 5,490,118 5,633,380
Public deposits | Asset Pledged as Collateral [Member]    
Cash 0 0
AFS Securities 754,132 749,398
HTM securities 615,378 621,494
Loans 0 0
Total assets 1,369,510 1,370,892
Repurchase agreements | Asset Pledged as Collateral [Member]    
Cash 0 0
AFS Securities 199,975 174,075
HTM securities 0 0
Loans 0 0
Total assets 199,975 174,075
FHLB advances | Asset Pledged as Collateral [Member]    
Cash 0 0
AFS Securities 46,448 48,718
HTM securities 0 0
Loans 3,244,890 2,960,926
Total assets 3,291,338 3,009,644
Derivatives | Asset Pledged as Collateral [Member]    
Cash 156,891 154,382
AFS Securities 60,868 61,311
HTM securities 0 0
Loans 0 0
Total assets 217,759 215,693
Federal Reserve Discount Window | Asset Pledged as Collateral [Member]    
Cash 0 0
AFS Securities 0 411,661
HTM securities 0 17,356
Loans 394,700 418,468
Total assets 394,700 847,485
Other purposes | Asset Pledged as Collateral [Member]    
Cash 0 0
AFS Securities 16,836 15,591
HTM securities 0 0
Loans 0 0
Total assets $ 16,836 $ 15,591