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INVESTMENT SECURITIES - Schedule of Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Available for Sale, Amortized Cost    
Within one year $ 17,445 $ 0
After one year but within five years 67,943 83,014
After five years but within ten years 564,061 465,777
After ten years 4,030,325 4,285,759
Amortized Cost 4,679,774 4,834,550
Available for Sale, Fair Value    
Within one year 16,573 0
After one year but within five years 63,357 77,499
After five years but within ten years 473,869 398,607
After ten years 3,401,119 3,616,954
Available-for-sale, fair value total 3,954,918 4,093,060
Held to Maturity, Amortized Cost    
Within one year 230 731
After one year but within five years 8,004 9,530
After five years but within ten years 40,366 46,170
After ten years 1,031,176 1,055,198
Investment securities held-to-maturity, net 1,079,776 1,111,629
Held to Maturity, Fair Value    
Within one year 230 732
After one year but within five years 7,935 9,476
After five years but within ten years 40,011 45,944
After ten years 957,667 983,952
Held-to-maturity, fair value total $ 1,005,843 $ 1,040,104