- Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Available-for-sale Securities [Abstract]
Total debt securities	$ 579,330	$ 576,583
Total available for sale securities	1,442,798	1,256,087
Held-to-maturity Securities [Abstract]
Total held to maturity securities	618,150	346,847
Level 1 [Member]
Available-for-sale Securities [Abstract]
Total available for sale securities	1,113	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	1,441,685	1,255,173
Held-to-maturity Securities [Abstract]
Total held to maturity securities	618,150	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	869,758	707,774
Level 3 [Member] \| One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	156,610	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	386,551	314,372
Level 3 [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	40,241	40,003
Level 3 [Member] \| Consumer Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	36,376	33,504
Level 3 [Member] \| Commercial Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	41,336	23,245
Recurring [Member]
Available-for-sale Securities [Abstract]
Trust preferred securities	12,188	13,944
Small business administration securities	84,104	56,056
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	700,040	608,590
Asset-baked securities	66,023
Mortgage-backed securities	579,330	576,583
Total debt securities	1,441,685	1,255,173
Common equities and mutual funds	1,113	914
Total available for sale securities	1,442,798	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	21,056	19,413
Non-bank qualified obligations of states and political subdivisions	457,336	261,330
Asset-backed securities	0
Mortgage-backed securities	139,758	66,104
Total debt securities	618,150	346,847
Common equities and mutual funds	0	0
Total held to maturity securities	618,150	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-baked securities	0
Mortgage-backed securities	0	0
Total debt securities	0	0
Common equities and mutual funds	1,113	914
Total available for sale securities	1,113	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	12,188	13,944
Small business administration securities	84,104	56,056
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	700,040	608,590
Asset-baked securities	66,023
Mortgage-backed securities	579,330	576,583
Total debt securities	1,441,685	1,255,173
Common equities and mutual funds	0	0
Total available for sale securities	1,441,685	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	21,056	19,413
Non-bank qualified obligations of states and political subdivisions	457,336	261,330
Asset-backed securities	0
Mortgage-backed securities	139,758	66,104
Total debt securities	618,150	346,847
Common equities and mutual funds	0	0
Total held to maturity securities	618,150	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-baked 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	77	2,543
Nonrecurring [Member] \| Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	77	663
Nonrecurring [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value		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
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
Nonrecurring [Member] \| Level 3 [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	77	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	$ 77	663
Nonrecurring [Member] \| Level 3 [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value		$ 1,880

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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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

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