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Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2021
Securities Sold under Agreements to Repurchase [Abstract] |  |  |
Gross Amounts Recognized |  | $ 206,695 | $ 331,006
Gross Amounts Offset in the Statement of Financial Position |  | 0 | 0
Net Amounts of Liabilities presented in the Statement of Financial Position |  | 206,695 | 331,006
Financial Instruments |  | 0 | 0
Fair Value Collateral Posted |  | 206,695 | 331,006
Net Amount |  | 0 | 0
Fair value of derivatives in a net liability position |  | 21,200 |
Interest rate swap |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Asset derivatives (other assets), fair value |  | 23,479 | 12,869
Liability derivatives (other liabilities), fair value |  | 21,110 | 15,794
Derivative Asset [Abstract] |  |  |
Gross Amounts Offset in the Statement of Financial Position |  | 0 | 0
Derivative financial instruments |  | 23,479 | 12,869
Financial Instruments |  | 0 | 1,033
Fair Value Collateral Received/ Pledged |  | 22,640 | 0
Net Amount |  | 839 | 11,836
Derivative Liability [Abstract] |  |  |
Gross Amounts Offset in the Statement of Financial Position |  | 0 | 0
Net Amounts of Liabilities presented in the Statement of Financial Position |  | 21,110 | 15,794
Financial Instruments |  | 0 | 1,033
Fair Value Collateral Posted |  | 0 | 14,031
Net Amount |  | 21,110 | 730
Derivatives Designated as Hedging Instruments: | Other Assets | Interest rate swap |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount |  | 61,962 | 61,962
Asset derivatives (other assets), fair value |  | 2,385 | 0
Derivatives Designated as Hedging Instruments: | Other Liabilities | Interest rate swap |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Liability derivatives (other liabilities), fair value |  | 0 | 2,911
Derivatives not Designated as Hedging Instruments: | Other Assets | Interest rate swap |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount |  | 636,314 | 918,698
Asset derivatives (other assets), fair value |  | 21,094 | 12,869
Derivatives not Designated as Hedging Instruments: | Other Liabilities | Interest rate swap |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Liability derivatives (other liabilities), fair value |  | $ 21,110 | $ 12,883
Cash Flow Hedging | Cash Flow Hedge 1 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed rate |  | 2.60% |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount |  | $ 15,465 |
Cash Flow Hedging | Cash Flow Hedge 2 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed rate |  | 2.60% |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount |  | $ 14,433 |
Cash Flow Hedging | Cash Flow Hedge 3 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed rate |  | 2.64% |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount |  | $ 18,558 |
Cash Flow Hedging | Cash Flow Hedge 4 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed rate |  | 2.64% |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount |  | $ 13,506 |
Cash Flow Hedging | Subordinated Debt |  |  |
Derivative [Line Items] |  |  |
Derivative, Variable Interest Rate |  | 2.62% |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount |  | $ 62,000 |
Scenario, Forecast | Cash Flow Hedging |  |  |
Derivative [Line Items] |  |  |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income | $ 1,100 |  |

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