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FAIR VALUE MEASUREMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Available-for-sale Securities [Abstract]    
Total debt securities $ 654,890 $ 586,454
Total available for sale securities 2,073,752 1,693,431
Held-to-maturity Securities [Abstract]    
Total held to maturity securities 226,550 564,185
Level 1 [Member]    
Available-for-sale Securities [Abstract]    
Total available for sale securities 1,851 1,445
Held-to-maturity Securities [Abstract]    
Total held to maturity securities 0 0
Level 2 [Member]    
Available-for-sale Securities [Abstract]    
Total available for sale securities 2,071,901 1,691,986
Held-to-maturity Securities [Abstract]    
Total held to maturity securities 226,550 564,185
Level 3 [Member]    
Available-for-sale Securities [Abstract]    
Total available for sale securities 0 0
Held-to-maturity Securities [Abstract]    
Total held to maturity securities 0 0
Recurring [Member]    
Available-for-sale Securities [Abstract]    
Small business administration securities 52,097 57,871
Obligations of states and political subdivisions 14,397 0
Non-bank qualified obligations of states and political subdivisions 1,206,366 950,829
Asset-baked securities 144,151 96,832
Mortgage-backed securities 654,890 586,454
Total debt securities 2,071,901 1,691,986
Common equities and mutual funds 1,851 1,445
Total available for sale securities 2,073,752 1,693,431
Held-to-maturity Securities [Abstract]    
Small business administration securities 0 0
Obligations of states and political subdivisions 3,926 19,368
Non-bank qualified obligations of states and political subdivisions 214,563 432,361
Asset-backed securities 0 0
Mortgage-backed securities 8,061 112,456
Total debt securities 226,550 564,185
Common equities and mutual funds 0 0
Total held to maturity securities 226,550 564,185
Recurring [Member] | Level 1 [Member]    
Available-for-sale Securities [Abstract]    
Small business administration securities 0 0
Obligations of states and political subdivisions 0 0
Non-bank qualified obligations of states and political subdivisions 0 0
Asset-baked securities 0 0
Mortgage-backed securities 0 0
Total debt securities 0 0
Common equities and mutual funds 1,851 1,445
Total available for sale securities 1,851 1,445
Held-to-maturity Securities [Abstract]    
Small business administration securities 0 0
Obligations of states and political subdivisions 0 0
Non-bank qualified obligations of states and political subdivisions 0 0
Asset-backed securities 0 0
Mortgage-backed securities 0 0
Total debt securities 0 0
Common equities and mutual funds 0 0
Total held to maturity securities 0 0
Recurring [Member] | Level 2 [Member]    
Available-for-sale Securities [Abstract]    
Small business administration securities 52,097 57,871
Obligations of states and political subdivisions 14,397 0
Non-bank qualified obligations of states and political subdivisions 1,206,366 950,829
Asset-baked securities 144,151 96,832
Mortgage-backed securities 654,890 586,454
Total debt securities 2,071,901 1,691,986
Common equities and mutual funds 0 0
Total available for sale securities 2,071,901 1,691,986
Held-to-maturity Securities [Abstract]    
Small business administration securities 0 0
Obligations of states and political subdivisions 3,926 19,368
Non-bank qualified obligations of states and political subdivisions 214,563 432,361
Asset-backed securities 0 0
Mortgage-backed securities 8,061 112,456
Total debt securities 226,550 564,185
Common equities and mutual funds 0 0
Total held to maturity securities 226,550 564,185
Recurring [Member] | Level 3 [Member]    
Available-for-sale Securities [Abstract]    
Small business administration securities 0 0
Obligations of states and political subdivisions 0 0
Non-bank qualified obligations of states and political subdivisions 0 0
Asset-baked securities 0 0
Mortgage-backed securities 0 0
Total debt securities 0 0
Common equities and mutual funds 0 0
Total available for sale securities 0 0
Held-to-maturity Securities [Abstract]    
Small business administration securities 0 0
Obligations of states and political subdivisions 0 0
Non-bank qualified obligations of states and political subdivisions 0 0
Asset-backed securities 0 0
Mortgage-backed securities 0 0
Total debt securities 0 0
Common equities and mutual funds 0 0
Total held to maturity securities $ 0 $ 0