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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Financial assets [Abstract]    
Securities available for sale $ 1,992,352 $ 1,693,431
Securities held to maturity 240,144 564,185
Financial liabilities [Abstract]    
Long-term debt 85,552 85,533
Level 1 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 1,300,409 1,267,586
Securities available for sale 1,829 1,445
Securities held to maturity 0 0
Total securities 1,829 1,445
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 0 0
Accrued interest receivable 21,089 19,380
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,779,645 2,454,057
Interest bearing demand deposits, savings, and money markets 185,376 169,557
Certificates of deposit 0 0
Deposits, Wholesale, Non-Maturing 40,928 18,245
Deposits, Wholesale, Certificates of Deposit 0 0
Total deposits 3,005,949 2,641,859
Advances from Federal Home Loan Bank 0 0
Federal Funds Purchased 1,100,000  
Federal fund purchased   987,000
Securities sold under agreements to repurchase 0 0
Long-term debt 0 0
Trust Preferred Securities 0 0
Subordinated debentures 0 0
Accrued interest payable 4,065 2,280
Level 2 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 0 0
Securities available for sale 1,990,523 1,691,986
Securities held to maturity 240,144 564,185
Total securities 2,230,667 2,256,171
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 57,443 61,123
Accrued interest receivable 0 0
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 0 0
Interest bearing demand deposits, savings, and money markets 0 0
Certificates of deposit 127,451 123,094
Deposits, Wholesale, Non-Maturing 0 0
Deposits, Wholesale, Certificates of Deposit 379,101 457,509
Total deposits 506,552 580,603
Advances from Federal Home Loan Bank 210,002 415,003
Federal Funds Purchased 0  
Federal fund purchased   0
Securities sold under agreements to repurchase 3,339 2,472
Long-term debt 1,922 1,938
Trust Preferred Securities 10,445 10,447
Subordinated debentures 75,750 76,500
Accrued interest payable 0 0
Level 3 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 0 0
Securities available for sale 0 0
Securities held to maturity 0 0
Total securities 0 0
Loans receivable [Abstract]    
Total loans receivable 1,532,835 1,318,402
Federal Home Loan Bank stock 0 0
Accrued interest receivable 0 0
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 0 0
Interest bearing demand deposits, savings, and money markets 0 0
Certificates of deposit 0 0
Deposits, Wholesale, Non-Maturing 0 0
Deposits, Wholesale, Certificates of Deposit 0 0
Total deposits 0 0
Advances from Federal Home Loan Bank 0 0
Federal Funds Purchased 0  
Federal fund purchased   0
Securities sold under agreements to repurchase 0 0
Long-term debt 0 0
Trust Preferred Securities 0 0
Subordinated debentures 0 0
Accrued interest payable 0 0
Carrying Amount [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 1,300,409 1,267,586
Securities available for sale 1,992,352 1,693,431
Securities held to maturity 243,492 563,529
Total securities 2,235,844 2,256,960
Loans receivable [Abstract]    
Total loans receivable 1,511,163 1,326,832
Federal Home Loan Bank stock 57,443 61,123
Accrued interest receivable 21,089 19,380
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,779,645 2,454,057
Interest bearing demand deposits, savings, and money markets 185,376 169,557
Certificates of deposit 128,220 123,637
Deposits, Wholesale, Non-Maturing 40,928 18,245
Deposits, Wholesale, Certificates of Deposit 379,476 457,928
Total deposits 3,513,645 3,223,424
Advances from Federal Home Loan Bank 210,000 415,000
Federal Funds Purchased 1,100,000  
Federal fund purchased   987,000
Securities sold under agreements to repurchase 3,339 2,472
Long-term debt 1,922 1,938
Trust Preferred Securities 10,310 10,310
Subordinated debentures 73,382 73,347
Accrued interest payable 4,065 2,280
Estimated Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 1,300,409 1,267,586
Securities available for sale 1,992,352 1,693,431
Securities held to maturity 240,144 564,185
Total securities 2,232,496 2,257,616
Loans receivable [Abstract]    
Total loans receivable 1,532,835 1,318,402
Federal Home Loan Bank stock 57,443 61,123
Accrued interest receivable 21,089 19,380
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,779,645 2,454,057
Interest bearing demand deposits, savings, and money markets 185,376 169,557
Certificates of deposit 127,451 123,094
Deposits, Wholesale, Non-Maturing 40,928 18,245
Deposits, Wholesale, Certificates of Deposit 379,101 457,509
Total deposits 3,512,501 3,222,462
Advances from Federal Home Loan Bank 210,002 415,003
Federal Funds Purchased 1,100,000  
Federal fund purchased   987,000
Securities sold under agreements to repurchase 3,339 2,472
Long-term debt 1,922 1,938
Trust Preferred Securities 10,445 10,447
Subordinated debentures 75,750 76,500
Accrued interest payable 4,065 2,280
1-4 Family Real Estate [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
1-4 Family Real Estate [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
1-4 Family Real Estate [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 205,413 196,970
1-4 Family Real Estate [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 203,967 196,706
1-4 Family Real Estate [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 205,413 196,970
Commercial and Multi-family Real Estate Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial and Multi-family Real Estate Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial and Multi-family Real Estate Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 655,777 576,330
Commercial and Multi-family Real Estate Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 654,029 585,510
Commercial and Multi-family Real Estate Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 655,777 576,330
Agricultural Real Estate [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Real Estate [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Real Estate [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 61,257 61,584
Agricultural Real Estate [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 61,303 61,800
Agricultural Real Estate [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 61,257 61,584
Consumer Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Consumer Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Consumer Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 293,832 163,961
Consumer Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 274,981 163,004
Consumer Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 293,832 163,961
Commercial Operating Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial Operating Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial Operating Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 56,520 35,723
Commercial Operating Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 56,516 35,759
Commercial Operating Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 56,520 35,723
Agricultural Operating [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Operating [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Operating [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 24,506 32,870
Agricultural Operating [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 24,696 33,594
Agricultural Operating [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 24,506 32,870
Premium Finance Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Premium Finance Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Premium Finance Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 235,530 250,964
Premium Finance Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 235,671 250,459
Premium Finance Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable $ 235,530 $ 250,964