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FAIR VALUE MEASUREMENTS, Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Sep. 30, 2015
--- | --- | ---
Available-for-sale Securities [Abstract] |  |
Total debt securities | $ 688,952 | $ 576,583
Total available for sale securities | 1,555,104 | 1,256,087
Held-to-maturity Securities [Abstract] |  |
Total held to maturity securities | 493,350 | 346,847
Level 1 [Member] |  |
Available-for-sale Securities [Abstract] |  |
Total available for sale securities | 1,106 | 914
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] | One to Four Family Residential Mortgage Loans [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 Loans [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 | 1,553,998 | 1,255,173
Held-to-maturity Securities [Abstract] |  |
Total held to maturity securities | 493,350 | 346,847
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 0 | 0
Level 2 [Member] | One to Four Family Residential Mortgage Loans [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 Loans [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 | 783,778 | 707,774
Level 3 [Member] | Total Impaired Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 1,187 | 2,543
Level 3 [Member] | One to Four Family Residential Mortgage Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 141,183 | 121,385
Level 3 [Member] | Commercial and Multi-family Real Estate Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 353,769 | 314,372
Level 3 [Member] | Agricultural Operating Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 38,364 | 40,003
Level 3 [Member] | Consumer Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 35,341 | 33,504
Level 3 [Member] | Commercial Operating Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 27,085 | 23,245
Recurring [Member] |  |
Available-for-sale Securities [Abstract] |  |
Trust preferred securities | 11,948 | 13,944
Small business administration securities | 83,697 | 56,056
Obligations of states and political subdivisions | 0 | 0
Non-bank qualified obligations of states and political subdivisions | 703,235 | 608,590
Asset-backed securities | 66,166 |
Mortgage-backed securities | 688,952 | 576,583
Total debt securities | 1,553,998 | 1,255,173
Common equities and mutual funds | 1,106 | 914
Total available for sale securities | 1,555,104 | 1,256,087
Held-to-maturity Securities [Abstract] |  |
Trust preferred securities | 0 | 0
Small business administration securities | 0 | 0
Obligations of states and political subdivisions | 20,983 | 19,413
Non-bank qualified obligations of states and political subdivisions | 403,959 | 261,330
Asset-backed securities | 0 |
Mortgage-backed securities | 68,408 | 66,104
Total debt securities | 493,350 | 346,847
Common equities and mutual funds | 0 | 0
Total held to maturity securities | 493,350 | 346,847
Recurring [Member] | Level 1 [Member] |  |
Available-for-sale Securities [Abstract] |  |
Trust preferred securities | 0 | 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 |
Mortgage-backed securities | 0 | 0
Total debt securities | 0 | 0
Common equities and mutual funds | 1,106 | 914
Total available for sale securities | 1,106 | 914
Held-to-maturity Securities [Abstract] |  |
Trust preferred securities | 0 | 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 |
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 | 11,948 | 13,944
Small business administration securities | 83,697 | 56,056
Obligations of states and political subdivisions | 0 | 0
Non-bank qualified obligations of states and political subdivisions | 703,235 | 608,590
Asset-backed securities | 66,166 |
Mortgage-backed securities | 688,952 | 576,583
Total debt securities | 1,553,998 | 1,255,173
Common equities and mutual funds | 0 | 0
Total available for sale securities | 1,553,998 | 1,255,173
Held-to-maturity Securities [Abstract] |  |
Trust preferred securities | 0 | 0
Small business administration securities | 0 | 0
Obligations of states and political subdivisions | 20,983 | 19,413
Non-bank qualified obligations of states and political subdivisions | 403,959 | 261,330
Asset-backed securities | 0 |
Mortgage-backed securities | 68,408 | 66,104
Total debt securities | 493,350 | 346,847
Common equities and mutual funds | 0 | 0
Total held to maturity securities | 493,350 | 346,847
Recurring [Member] | Level 3 [Member] |  |
Available-for-sale Securities [Abstract] |  |
Trust preferred securities | 0 | 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 |
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 | 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 |
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 | 1,187 | 2,543
Nonrecurring [Member] | Commercial and Multi-family Real Estate Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 612 | 663
Nonrecurring [Member] | Agricultural Operating Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 575 | 1,880
Nonrecurring [Member] | Level 1 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 0 | 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 | 0
Nonrecurring [Member] | Level 1 [Member] | Agricultural Operating Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 0 | 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] | Commercial and Multi-family Real Estate Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 0 | 0
Nonrecurring [Member] | Level 2 [Member] | Agricultural Operating Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 0 | 0
Nonrecurring [Member] | Level 3 [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | 1,187 | 2,543
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 | 612 | 663
Nonrecurring [Member] | Level 3 [Member] | Agricultural Operating Loans [Member] |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Fair value | $ 575 | $ 1,880

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