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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

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents debt securities issued by the Small Business Administration (SBA) as of the balance sheet date which have been categorized as available-for-sale. + References No definition available. + Details
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