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DIVESTITURE - Summarized Division Results (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Feb. 29, 2020
Balance Sheet Disclosures [Abstract] |  |  |  |  |
Gain on sale |  |  | $ 19,275 | $ 0 |
Income Statement Disclosures [Abstract] |  |  |  |  |
Net interest income - Retained | $ 67,737 | $ 71,350 | 132,388 | 131,622 |
Provision for loan and lease losses, Retained | (37,296) | (33,318) | (40,703) | (42,417) |
Noninterest income - Retained | 120,513 | 105,025 | 157,995 | 142,776 |
Noninterest expense - Retained | 91,729 | 110,254 | 167,526 | 184,549 |
Income before income tax expense - Retained | 59,225 | $ 32,803 | 82,154 | $ 47,432 |
Community Bank | Community Bank Sold |  |  |  |  |
Balance Sheet Disclosures [Abstract] |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 2,504
Loans |  |  |  |  | 268,584
Premises, furniture and equipment |  |  |  |  | 4,945
Other assets |  |  |  |  | 1,250
Total assets |  |  |  |  | 277,283
Deposits |  |  |  |  | 290,493
Borrowings |  |  |  |  | 0
Other liabilities |  |  |  |  | 1,720
Total liabilities |  |  |  |  | 292,213
Net assets |  |  |  |  | (14,930)
Purchase price |  |  |  |  | $ 4,345
Gain on sale | 19,275 |  |  |  |
Income Statement Disclosures [Abstract] |  |  |  |  |
Net interest income - Sold | 1,525 |  | 2,512 |  |
Provision for loan and lease losses - Sold | 0 |  | 1,750 |  |
Noninterest income - Sold | 19,403 |  | 19,694 |  |
Noninterest expense - Sold | 3,039 |  | 4,916 |  |
Income before income tax expense - Sold | 17,889 |  | 19,040 |  |
Community Bank |  |  |  |  |
Income Statement Disclosures [Abstract] |  |  |  |  |
Net interest income - Retained | 7,797 |  | 17,393 |  |
Net interest income, Sold and Retained, Amount | 9,322 |  | 19,905 |  |
Provision for loan and lease losses, Retained | (6,974) |  | (6,974) |  |
Provision for loan and lease losses, Sold and Retained, Amount | (6,974) |  | (5,224) |  |
Noninterest income - Retained | 23 |  | (3,484) |  |
Noninterest income, Sold and Retained, Amount | 19,426 |  | 16,210 |  |
Noninterest expense - Retained | 866 |  | 3,551 |  |
Noninterest expense, Sold and Retained, Amount | 3,905 |  | 8,467 |  |
Income before income tax expense - Retained | (20) |  | 3,384 |  |
Income before income tax expense - Sold and Retained, Amount | $ 17,869 |  | $ 22,424 |  |

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