SECURITIES - Schedule of Available For Sale Securities By Maturity (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Maturities of Available-for-sale Debt Securities [Abstract]
Amortized Cost, Due in one year or less	$ 4,245
Amortized Cost, Due after one year through five years	11,953
Amortized Cost, Due after five years through ten years	50,464
Amortized Cost, Due after ten years	703,480
Amortized Cost, Available for sale securities with maturities amortized cost	770,142
Amortized Cost, Mortgage-backed securities	454,087
Amortized Cost, Total debt securities	1,224,229
Fair Value, Due in one year or less	4,256
Fair Value, Due after one year through five years	12,284
Fair Value, Due after five years through ten years	52,987
Fair Value, Due after ten years	714,173
Fair Value, Available for sale securities with maturities fair value	783,700
Fair Value, Mortgage-backed securities	456,015
Total Securities	$ 1,239,715