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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
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Available-for-sale debt securities [Abstract] |  |
Amortized Cost | $ 1,201,561 | $ 1,244,384
Fair Value | 1,228,124 | 1,268,102
Amortized Cost |  |
Due in one year or less | 720 | 1,385
Due after one year through five years | 22,799 | 20,805
Due after five years through ten years | 32,099 | 32,441
Due after ten years | 727,553 | 749,874
Total | 783,171 | 804,505
Mortgage-backed securities | 418,390 | 439,879
Fair Value |  |
Due in one year or less | 724 | 1,398
Due after one year through five years | 23,707 | 21,769
Due after five years through ten years | 33,738 | 34,025
Due after ten years | 739,194 | 757,303
Total | 797,363 | 814,495
Mortgage-backed securities | 430,761 | 453,607
SBA securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 156,929 | 159,722
Gross Unrealized Gains | 5,255 | 5,391
Gross Unrealized (Losses) | (175) | (158)
Fair Value | 162,009 | 164,955
LESS THAN 12 MONTHS, Fair Value | 40,938 | 32,257
LESS THAN 12 MONTHS, Unrealized (Losses) | (81) | (102)
OVER 12 MONTHS, Fair Value | 18,623 | 9,875
OVER 12 MONTHS, Unrealized (Losses) | (94) | (56)
TOTAL, Fair Value | 59,561 | 42,132
TOTAL, Unrealized (Losses) | (175) | (158)
Obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 2,823 | 825
Gross Unrealized Gains | 17 | 16
Gross Unrealized (Losses) | 0 | 0
Fair Value | 2,840 | 841
Non-bank qualified obligations of states and political subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 299,830 | 314,819
Gross Unrealized Gains | 9,808 | 8,978
Gross Unrealized (Losses) | 0 | (23)
Fair Value | 309,638 | 323,774
LESS THAN 12 MONTHS, Fair Value |  | 6,265
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (6)
OVER 12 MONTHS, Fair Value |  | 3,103
OVER 12 MONTHS, Unrealized (Losses) |  | (17)
TOTAL, Fair Value |  | 9,368
TOTAL, Unrealized (Losses) |  | (23)
Asset-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 323,589 | 329,139
Gross Unrealized Gains | 2,752 | 2,015
Gross Unrealized (Losses) | (3,465) | (6,229)
Fair Value | 322,876 | 324,925
LESS THAN 12 MONTHS, Fair Value | 60,713 | 106,474
LESS THAN 12 MONTHS, Unrealized (Losses) | (136) | (1,089)
OVER 12 MONTHS, Fair Value | 200,240 | 178,686
OVER 12 MONTHS, Unrealized (Losses) | (3,329) | (5,140)
TOTAL, Fair Value | 260,953 | 285,160
TOTAL, Unrealized (Losses) | (3,465) | (6,229)
Mortgage-backed securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 418,390 | 439,879
Gross Unrealized Gains | 12,685 | 14,567
Gross Unrealized (Losses) | (314) | (839)
Fair Value | 430,761 | 453,607
LESS THAN 12 MONTHS, Fair Value | 62,494 | 138,338
LESS THAN 12 MONTHS, Unrealized (Losses) | (314) | (839)
OVER 12 MONTHS, Fair Value | 0 | 0
OVER 12 MONTHS, Unrealized (Losses) | 0 | 0
TOTAL, Fair Value | 62,494 | 138,338
TOTAL, Unrealized (Losses) | (314) | (839)
Total debt securities AFS |  |
Available-for-sale debt securities [Abstract] |  |
Amortized Cost | 1,201,561 | 1,244,384
Gross Unrealized Gains | 30,517 | 30,967
Gross Unrealized (Losses) | (3,954) | (7,249)
Fair Value | 1,228,124 | 1,268,102
LESS THAN 12 MONTHS, Fair Value | 164,145 | 283,334
LESS THAN 12 MONTHS, Unrealized (Losses) | (531) | (2,036)
OVER 12 MONTHS, Fair Value | 218,863 | 191,664
OVER 12 MONTHS, Unrealized (Losses) | (3,423) | (5,213)
TOTAL, Fair Value | 383,008 | 474,998
TOTAL, Unrealized (Losses) | $ (3,954) | $ (7,249)

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