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SECURITIES - Amortized Cost and Estimated Fair Value of Investments in Debt Securities By Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available for sale, Amortized Cost
Due in one year or less	$ 528
Due after one year through five years	1,485
Due after five years through ten years	57,795
Due after ten years	988,337
Total available-for-sale investment securities	1,048,145
Mortgage-backed Securities	339,729
Amortized cost	1,387,874	$ 2,655,594
Available for sale Securities, Fair Value
Due in one year or less	529
Due after one year through five years	1,498
Due after five years through ten years	57,890
Due after ten years	913,639
Subtotal	973,556
Mortgage-backed Securities and Other Equity Securities	325,458
Total	1,299,014	2,764,325
Held to Maturity, Amortized Cost
Due in one year or less	125
Due after one year through five years	24,810
Due after five years through ten years	133,794
Due after ten years	1,031,379
Subtotal	1,190,108
Mortgage-backed Securities	136,621
Amortized Cost	1,326,729	90,780
Held to Maturity, Fair Value
Due in one year or less	124
Due after one year through five years	24,615
Due after five years through ten years	126,505
Due after ten years	872,132
Subtotal	1,023,376
Mortgage-backed Securities	125,780
Total	$ 1,149,156	$ 95,235

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