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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Summary of Fair Values of Securities Available for Sale and Held to Maturity | The following table summarizes the fair values of securities available for sale and held to maturity at December 31, 2017 and September 30, 2017. Securities available for sale are measured at fair value on a recurring basis, while securities held to maturity are carried at amortized cost in the consolidated statements of financial condition.
| Fair Value At December 31, 2017
| Available For Sale |  | Held to Maturity
(Dollars in Thousands) | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Small business administration securities | 56,948 |  |  | — |  |  | 56,948 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Obligations of states and political subdivisions | 14,610 |  |  | — |  |  | 14,610 |  |  | — |  |  | 4,342 |  |  | — |  |  | 4,342 |  |  | — |
Non-bank qualified obligations of states and political subdivisions | 1,223,030 |  |  | — |  |  | 1,223,030 |  |  | — |  |  | 227,482 |  |  | — |  |  | 227,482 |  |  | — |
Asset-backed securities | 95,823 |  |  | — |  |  | 95,823 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Mortgage-backed securities | 600,112 |  |  | — |  |  | 600,112 |  |  | — |  |  | 8,320 |  |  | — |  |  | 8,320 |  |  | — |
Total debt securities | 1,990,523 |  |  | — |  |  | 1,990,523 |  |  | — |  |  | 240,144 |  |  | — |  |  | 240,144 |  |  | — |
Common equities and mutual funds | 1,829 |  |  | 1,829 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total securities | $ | 1,992,352 |  |  | $ | 1,829 |  |  | $ | 1,990,523 |  |  | $ | — |  |  | $ | 240,144 |  |  | $ | — |  |  | $ | 240,144 |  |  | $ | — |
| Fair Value At September 30, 2017
| Available For Sale |  | Held to Maturity
(Dollars in Thousands) | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Small business administration securities | 57,871 |  |  | — |  |  | 57,871 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Obligations of states and political subdivisions | — |  |  | — |  |  | — |  |  | — |  |  | 19,368 |  |  | — |  |  | 19,368 |  |  | — |
Non-bank qualified obligations of states and political subdivisions | 950,829 |  |  | — |  |  | 950,829 |  |  | — |  |  | 432,361 |  |  | — |  |  | 432,361 |  |  | — |
Asset-backed securities | 96,832 |  |  | — |  |  | 96,832 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Mortgage-backed securities | 586,454 |  |  | — |  |  | 586,454 |  |  | — |  |  | 112,456 |  |  | — |  |  | 112,456 |  |  | — |
Total debt securities | 1,691,986 |  |  | — |  |  | 1,691,986 |  |  | — |  |  | 564,185 |  |  | — |  |  | 564,185 |  |  | — |
Common equities and mutual funds | 1,445 |  |  | 1,445 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total securities | $ | 1,693,431 |  |  | $ | 1,445 |  |  | $ | 1,691,986 |  |  | $ | — |  |  | $ | 564,185 |  |  | $ | — |  |  | $ | 564,185 |  |  | $ | — |
Assets Measured at Fair Value on Nonrecurring Basis | The following table summarizes the assets of the Company that were measured at fair value in the consolidated statements of financial condition on a non-recurring basis as of December 31, 2017 and September 30, 2017.
| Fair Value At December 31, 2017
(Dollars in Thousands) | Total |  | Level 1 |  | Level 2 |  | Level 3
Foreclosed Assets, net | 128 |  |  | — |  |  | — |  |  | 128 |
Total | $ | 128 |  |  | $ | — |  |  | $ | — |  |  | $ | 128 |
| Fair Value At September 30, 2017
(Dollars in Thousands) | Total |  | Level 1 |  | Level 2 |  | Level 3
Foreclosed Assets, net | 292 |  |  |  |  |  |  | 292 |
Total | $ | 292 |  |  | $ | — |  |  | $ | — |  |  | $ | 292 |
Quantitative Information about Level 3 Fair Value Measurements |
| Quantitative Information About Level 3 Fair Value Measurements
(Dollars in Thousands) | Fair Value at December 31, 2017 |  | Fair Value at September 30, 2017 |  | Valuation Technique |  | Unobservable Input |  | Range of Inputs
Foreclosed Assets, net | $ | 128 |  |  | 292 |  |  | Market approach |  | Appraised values (1) |  | 4.00 - 10.00%
(1) | The Company generally relies on external appraisers to develop this information. Management reduced the appraised value by estimating selling costs in a range of 4% to 10%.
Carrying Amount and Estimated Fair Value of Financial Instruments | The following presents the carrying amount and estimated fair value of the financial instruments held by the Company at December 31, 2017 and September 30, 2017.
| December 31, 2017
| Carrying Amount |  | Estimated Fair Value |  | Level 1 |  | Level 2 |  | Level 3
| (Dollars in Thousands)
Financial assets |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 1,300,409 |  |  | $ | 1,300,409 |  |  | $ | 1,300,409 |  |  | $ | — |  |  | $ | — |
Securities available for sale | 1,992,352 |  |  | 1,992,352 |  |  | 1,829 |  |  | 1,990,523 |  |  | — |
Securities held to maturity | 243,492 |  |  | 240,144 |  |  | — |  |  | 240,144 |  |  | — |
Total securities | 2,235,844 |  |  | 2,232,496 |  |  | 1,829 |  |  | 2,230,667 |  |  | — |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One to four family residential mortgage loans | 203,967 |  |  | 205,413 |  |  | — |  |  | — |  |  | 205,413 |
Commercial and multi-family real estate loans | 654,029 |  |  | 655,777 |  |  | — |  |  | — |  |  | 655,777 |
Agricultural real estate loans | 61,303 |  |  | 61,257 |  |  | — |  |  | — |  |  | 61,257 |
Consumer loans | 274,981 |  |  | 293,832 |  |  | — |  |  | — |  |  | 293,832 |
Commercial operating loans | 56,516 |  |  | 56,520 |  |  | — |  |  | — |  |  | 56,520 |
Agricultural operating loans | 24,696 |  |  | 24,506 |  |  | — |  |  | — |  |  | 24,506 |
CML insurance premium finance loans | 235,671 |  |  | 235,530 |  |  | — |  |  | — |  |  | 235,530 |
Total loans receivable | 1,511,163 |  |  | 1,532,835 |  |  | — |  |  | — |  |  | 1,532,835 |
Federal Home Loan Bank stock | 57,443 |  |  | 57,443 |  |  | — |  |  | 57,443 |  |  | — |
Accrued interest receivable | 21,089 |  |  | 21,089 |  |  | 21,089 |  |  | — |  |  | — |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noninterest bearing demand deposits | 2,779,645 |  |  | 2,779,645 |  |  | 2,779,645 |  |  | — |  |  | — |
Interest bearing demand deposits, savings, and money markets | 185,376 |  |  | 185,376 |  |  | 185,376 |  |  | — |  |  | — |
Certificates of deposit | 128,220 |  |  | 127,451 |  |  | — |  |  | 127,451 |  |  | — |
Wholesale non-maturing deposits | 40,928 |  |  | 40,928 |  |  | 40,928 |  |  | — |  |  | — |
Wholesale certificates of deposit | 379,476 |  |  | 379,101 |  |  | — |  |  | 379,101 |  |  | — |
Total deposits | 3,513,645 |  |  | 3,512,501 |  |  | 3,005,949 |  |  | 506,552 |  |  | — |
Advances from Federal Home Loan Bank | 210,000 |  |  | 210,002 |  |  | — |  |  | 210,002 |  |  | — |
Federal funds purchased | 1,100,000 |  |  | 1,100,000 |  |  | 1,100,000 |  |  | — |  |  | — |
Securities sold under agreements to repurchase | 3,339 |  |  | 3,339 |  |  | — |  |  | 3,339 |  |  | — |
Capital lease | 1,922 |  |  | 1,922 |  |  | — |  |  | 1,922 |  |  | — |
Trust preferred securities | 10,310 |  |  | 10,445 |  |  | — |  |  | 10,445 |  |  | — |
Subordinated debentures | 73,382 |  |  | 75,750 |  |  | — |  |  | 75,750 |  |  | — |
Accrued interest payable | 4,065 |  |  | 4,065 |  |  | 4,065 |  |  | — |  |  | — |
| September 30, 2017
| Carrying Amount |  | Estimated Fair Value |  | Level 1 |  | Level 2 |  | Level 3
| (Dollars in Thousands)
Financial assets |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 1,267,586 |  |  | $ | 1,267,586 |  |  | $ | 1,267,586 |  |  | $ | — |  |  | $ | — |
Securities available for sale | 1,693,431 |  |  | 1,693,431 |  |  | 1,445 |  |  | 1,691,986 |  |  | — |
Securities held to maturity | 563,529 |  |  | 564,185 |  |  | — |  |  | 564,185 |  |  | — |
Total securities | 2,256,960 |  |  | 2,257,616 |  |  | 1,445 |  |  | 2,256,171 |  |  | — |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One to four family residential mortgage loans | 196,706 |  |  | 196,970 |  |  | — |  |  | — |  |  | 196,970 |
Commercial and multi-family real estate loans | 585,510 |  |  | 576,330 |  |  | — |  |  | — |  |  | 576,330 |
Agricultural real estate loans | 61,800 |  |  | 61,584 |  |  | — |  |  | — |  |  | 61,584 |
Consumer loans | 163,004 |  |  | 163,961 |  |  | — |  |  | — |  |  | 163,961 |
Commercial operating loans | 35,759 |  |  | 35,723 |  |  | — |  |  | — |  |  | 35,723 |
Agricultural operating loans | 33,594 |  |  | 32,870 |  |  | — |  |  | — |  |  | 32,870 |
CML insurance premium finance loans | 250,459 |  |  | 250,964 |  |  | — |  |  | — |  |  | 250,964 |
Total loans receivable | 1,326,832 |  |  | 1,318,402 |  |  | — |  |  | — |  |  | 1,318,402 |
Federal Home Loan Bank stock | 61,123 |  |  | 61,123 |  |  | — |  |  | 61,123 |  |  | — |
Accrued interest receivable | 19,380 |  |  | 19,380 |  |  | 19,380 |  |  | — |  |  | — |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noninterest bearing demand deposits | 2,454,057 |  |  | 2,454,057 |  |  | 2,454,057 |  |  | — |  |  | — |
Interest bearing demand deposits, savings, and money markets | 169,557 |  |  | 169,557 |  |  | 169,557 |  |  | — |  |  | — |
Certificates of deposit | 123,637 |  |  | 123,094 |  |  | — |  |  | 123,094 |  |  | — |
Wholesale non-maturing deposits | 18,245 |  |  | 18,245 |  |  | 18,245 |  |  | — |  |  | — |
Wholesale certificates of deposits | 457,928 |  |  | 457,509 |  |  | — |  |  | 457,509 |  |  | — |
Total deposits | 3,223,424 |  |  | 3,222,462 |  |  | 2,641,859 |  |  | 580,603 |  |  | — |
Advances from Federal Home Loan Bank | 415,000 |  |  | 415,003 |  |  | — |  |  | 415,003 |  |  | — |
Federal funds purchased | 987,000 |  |  | 987,000 |  |  | 987,000 |  |  | — |  |  | — |
Securities sold under agreements to repurchase | 2,472 |  |  | 2,472 |  |  | — |  |  | 2,472 |  |  | — |
Capital lease | 1,938 |  |  | 1,938 |  |  | — |  |  | 1,938 |  |  | — |
Trust preferred securities | 10,310 |  |  | 10,447 |  |  | — |  |  | 10,447 |  |  | — |
Subordinated debentures | 73,347 |  |  | 76,500 |  |  | — |  |  | 76,500 |  |  | — |
Accrued interest payable | 2,280 |  |  | 2,280 |  |  | 2,280 |  |  | — |  |  | — |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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