FAIR VALUE MEASUREMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Available-for-sale Securities [Abstract]
Total debt securities	$ 666,424	$ 558,940
Total available for sale securities	1,808,108	1,469,249
Held-to-maturity Securities [Abstract]
Total held to maturity securities	581,921	632,574
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	364	76
Level 1 [Member]
Available-for-sale Securities [Abstract]
Total available for sale securities	1,445	1,125
Held-to-maturity Securities [Abstract]
Total held to maturity securities	0	0
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 1 [Member] \| 1-4 Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 1 [Member] \| Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 1 [Member] \| Agricultural Operating [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 1 [Member] \| Consumer Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 1 [Member] \| Commercial Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member]
Available-for-sale Securities [Abstract]
Total available for sale securities	1,806,663	1,468,124
Held-to-maturity Securities [Abstract]
Total held to maturity securities	581,921	632,574
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member] \| 1-4 Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member] \| Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member] \| Agricultural Operating [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member] \| Consumer Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member] \| Commercial Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
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
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	1,214,592	926,803
Level 3 [Member] \| 1-4 Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	188,813	163,886
Level 3 [Member] \| Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	484,155	422,307
Level 3 [Member] \| Agricultural Operating [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	35,395	36,897
Level 3 [Member] \| Consumer Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	173,416	36,738
Level 3 [Member] \| Commercial Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	38,965	31,108
Recurring [Member]
Available-for-sale Securities [Abstract]
Trust preferred securities		12,978
Small business administration securities	102,060	80,719
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	917,875	698,672
Asset-baked securities	120,304	116,815
Mortgage-backed securities	666,424	558,940
Total debt securities	1,806,663	1,468,124
Common equities and mutual funds	1,445	1,125
Total available for sale securities	1,808,108	1,469,249
Held-to-maturity Securities [Abstract]
Trust preferred securities		0
Small business administration securities	0	0
Obligations of states and political subdivisions	19,638	20,937
Non-bank qualified obligations of states and political subdivisions	446,475	477,202
Asset-backed securities	0	0
Mortgage-backed securities	115,808	134,435
Total debt securities	581,921	632,574
Common equities and mutual funds	0	0
Total held to maturity securities	581,921	632,574
Recurring [Member] \| Level 1 [Member]
Available-for-sale Securities [Abstract]
Trust preferred securities		0
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	1,445	1,125
Total available for sale securities	1,445	1,125
Held-to-maturity Securities [Abstract]
Trust preferred securities		0
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]
Trust preferred securities		12,978
Small business administration securities	102,060	80,719
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	917,875	698,672
Asset-baked securities	120,304	116,815
Mortgage-backed securities	666,424	558,940
Total debt securities	1,806,663	1,468,124
Common equities and mutual funds	0	0
Total available for sale securities	1,806,663	1,468,124
Held-to-maturity Securities [Abstract]
Trust preferred securities		0
Small business administration securities	0	0
Obligations of states and political subdivisions	19,638	20,937
Non-bank qualified obligations of states and political subdivisions	446,475	477,202
Asset-backed securities	0	0
Mortgage-backed securities	115,808	134,435
Total debt securities	581,921	632,574
Common equities and mutual funds	0	0
Total held to maturity securities	581,921	632,574
Recurring [Member] \| Level 3 [Member]
Available-for-sale Securities [Abstract]
Trust preferred securities		0
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]
Trust preferred securities		0
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
Nonrecurring [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	364	144
Nonrecurring [Member] \| Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0
Nonrecurring [Member] \| Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value		68
Nonrecurring [Member] \| Agricultural Operating [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value		68
Nonrecurring [Member] \| Foreclosed Assets [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	364	76
Nonrecurring [Member] \| Level 1 [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Nonrecurring [Member] \| Level 1 [Member] \| Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0
Nonrecurring [Member] \| Level 1 [Member] \| Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value		0
Nonrecurring [Member] \| Level 1 [Member] \| Agricultural Operating [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value		0
Nonrecurring [Member] \| Level 1 [Member] \| Foreclosed Assets [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	0
Nonrecurring [Member] \| Level 2 [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Nonrecurring [Member] \| Level 2 [Member] \| Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0
Nonrecurring [Member] \| Level 2 [Member] \| Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value		0
Nonrecurring [Member] \| Level 2 [Member] \| Agricultural Operating [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value		0
Nonrecurring [Member] \| Level 2 [Member] \| Foreclosed Assets [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	0
Nonrecurring [Member] \| Level 3 [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	364	144
Nonrecurring [Member] \| Level 3 [Member] \| Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0
Nonrecurring [Member] \| Level 3 [Member] \| Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value		68
Nonrecurring [Member] \| Level 3 [Member] \| Agricultural Operating [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value		68
Nonrecurring [Member] \| Level 3 [Member] \| Foreclosed Assets [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	$ 364	$ 76

Fair value of asset backed securities investments classified as available for sale.

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Fair value of asset backed securities investments classified as held To maturity.

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Fair value of debt securities categorized as held-to-maturity.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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