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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

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