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FAIR VALUES OF FINANCIAL INSTRUMENTS, Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers between levels of fair value hierarchy $ 0 $ 0
Available-for-sale Securities [Abstract]    
Total debt securities 576,583 657,870
Total securities 1,256,087 1,140,216
Held-to-maturity Securities [Abstract]    
Total securities 346,847 279,312
Level 1 [Member]    
Available-for-sale Securities [Abstract]    
Total securities 914 825
Held-to-maturity Securities [Abstract]    
Total 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 [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 2 [Member]    
Available-for-sale Securities [Abstract]    
Total securities 1,255,173 1,139,391
Held-to-maturity Securities [Abstract]    
Total securities 346,847 279,312
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 [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 3 [Member]    
Available-for-sale Securities [Abstract]    
Total securities 0 0
Held-to-maturity Securities [Abstract]    
Total securities 0 0
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value 707,774 504,388
Level 3 [Member] | One to Four Family Residential Mortgage Loans [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value 121,385 111,254
Level 3 [Member] | Commercial and Multi-Family Real Estate [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value 314,372 234,845
Level 3 [Member] | Agricultural Operating Loans [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value 40,003 44,398
Recurring [Member]    
Available-for-sale Securities [Abstract]    
Trust preferred and corporate securities 13,944 46,929
Small business administration securities 56,056 67,012
Obligations of states and political subdivisions 0 0
Non-bank qualified obligations of states and political subdivisions 608,590 367,580
Mortgage-backed securities 576,583 657,870
Total debt securities 1,255,173 1,139,391
Common Equities and Mutual Funds, Available-for-Sale 914 825
Total securities 1,256,087 1,140,216
Held-to-maturity Securities [Abstract]    
Trust preferred and corporate securities 0 0
Small business administration securities 0 0
Obligations of states and political subdivisions 19,413 18,980
Non-bank qualified obligations of states and political subdivisions 261,330 192,160
Mortgage-backed securities 66,104 68,172
Total debt securities 346,847 279,312
Common equities and mutual funds 0 0
Total securities 346,847 279,312
Recurring [Member] | Level 1 [Member]    
Available-for-sale Securities [Abstract]    
Trust preferred and corporate 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
Mortgage-backed securities 0 0
Total debt securities 0 0
Common Equities and Mutual Funds, Available-for-Sale 914 825
Total securities 914 825
Held-to-maturity Securities [Abstract]    
Trust preferred and corporate 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
Mortgage-backed securities 0 0
Total debt securities 0 0
Common equities and mutual funds 0 0
Total securities 0 0
Recurring [Member] | Level 2 [Member]    
Available-for-sale Securities [Abstract]    
Trust preferred and corporate securities 13,944 46,929
Small business administration securities 56,056 67,012
Obligations of states and political subdivisions 0 0
Non-bank qualified obligations of states and political subdivisions 608,590 367,580
Mortgage-backed securities 576,583 657,870
Total debt securities 1,255,173 1,139,391
Common Equities and Mutual Funds, Available-for-Sale 0 0
Total securities 1,255,173 1,139,391
Held-to-maturity Securities [Abstract]    
Trust preferred and corporate securities 0 0
Small business administration securities 0 0
Obligations of states and political subdivisions 19,413 18,980
Non-bank qualified obligations of states and political subdivisions 261,330 192,160
Mortgage-backed securities 66,104 68,172
Total debt securities 346,847 279,312
Common equities and mutual funds 0 0
Total securities 346,847 279,312
Recurring [Member] | Level 3 [Member]    
Available-for-sale Securities [Abstract]    
Trust preferred and corporate 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
Mortgage-backed securities 0 0
Total debt securities 0 0
Common Equities and Mutual Funds, Available-for-Sale 0 0
Total securities 0 0
Held-to-maturity Securities [Abstract]    
Trust preferred and corporate 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
Mortgage-backed securities 0 0
Total debt securities 0 0
Common equities and mutual funds 0 0
Total securities 0 0
Nonrecurring [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value 2,543 1,167
Nonrecurring [Member] | Total Impaired Loans [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value   1,152
Nonrecurring [Member] | One to Four Family Residential Mortgage Loans [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value   222
Nonrecurring [Member] | Commercial and Multi-Family Real Estate [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value 663 930
Nonrecurring [Member] | Agricultural Operating Loans [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value 1,880  
Nonrecurring [Member] | Foreclosed Assets, Net [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value   15
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] | One to Four Family Residential Mortgage 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 [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  
Nonrecurring [Member] | Level 1 [Member] | Foreclosed Assets, Net [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value   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] | One to Four Family Residential Mortgage 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 [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  
Nonrecurring [Member] | Level 2 [Member] | Foreclosed Assets, Net [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value   0
Nonrecurring [Member] | Level 3 [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value 2,543 1,167
Nonrecurring [Member] | Level 3 [Member] | Total Impaired Loans [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value   1,152
Nonrecurring [Member] | Level 3 [Member] | One to Four Family Residential Mortgage Loans [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value   222
Nonrecurring [Member] | Level 3 [Member] | Commercial and Multi-Family Real Estate [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value 663 930
Nonrecurring [Member] | Level 3 [Member] | Agricultural Operating Loans [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value $ 1,880  
Nonrecurring [Member] | Level 3 [Member] | Foreclosed Assets, Net [Member]    
Fair value of assets measured on non-recurring basis [Abstract]    
Fair value   $ 15