SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ADOPTED ACCOUNTING STANDARDS UPDATES ("ASU") (Policies)	3 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
New Accounting Pronouncements	Adopted ASUs Effective October 1, 2020, the Company adopted ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and subsequent related ASUs (collectively “Topic 326”), which changes the impairment model for most financial assets, including trade and other receivables, debt securities held-to-maturity, loans, net investments in leases, purchased financial assets with credit deterioration, and off-balance sheet credit exposures. ASU 2016-13 requires the use of a current expected credit loss (“CECL”) methodology to determine the allowance for credit losses for loans and debt securities held-to-maturity. CECL requires loss estimates for the remaining estimated life of the assets to be measured using historical loss data, adjustments for current conditions, and adjustments for reasonable and supportable forecasts of future economic conditions. The Company adopted CECL using the modified retrospective approach with a cumulative effect adjustment to Retained Earnings recorded on October 1, 2020. Our adoption resulted in an ACL as of October 1, 2020 that is larger than the allowance for loan and lease losses (“ALLL”) that would have been recorded under legacy guidance on the same date by $12.8 million in total for all portfolios. A portion of this increase is a result of new requirements to record ACL on acquired loans and leases, regardless of any credit mark recorded. Under legacy guidance, credit marks were included in the determination of fair value adjustments reflected as a discount to the carrying value of the loans and leases and an ALLL was not recorded on acquired loans and leases until evidence of credit deterioration existed post acquisition. The remaining credit and interest mark will continue to accrete over the life of the loan or lease but will no longer be considered when estimating the ACL for acquired loans and leases under CECL. The adoption of CECL also resulted in an increase in the liability of unfunded commitments of $0.8 million. For other assets in scope of the standard such as held-to-maturity debt securities and trade and other receivables, the impact from this ASU was inconsequential. The cumulative tax effected adjustment to record ACL and to increase the unfunded commitments liability resulted in a reduction to retained earnings of $8.4 million along with $2.5 million attributable to noncontrolling interests. Post adoption, as loans and leases are added to the portfolio, the Company expects higher levels of ACL determined by CECL assumptions, resulted in accelerated recognition of provision for credit losses, as compared to historical results. In response to the COVID-19 pandemic, regulatory agencies have published a final rule that provides the option to delay the cumulative effect of the day 1 impact to CECL adoption on regulatory capital for two years, followed by a three-year phase in period. Management has elected this five-year transition period consistent with the final rule. Additional and modified disclosure requirements under CECL are included in Note 5. Securities and Note 6. Loans and Leases, Net. The Company also adopted the following ASUs on October 1, 2020, none of which had a material impact on the Company’s Condensed Consolidated Financial Statements: –ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement. –ASU 2018-15, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract. –ASU 2018-17, Consolidation (Topic 810) – Targeted Improvements to Related Party Guidance for Variable Interest Entities. ASUs to be Adopted ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The amendments in this ASU are intended to simplify the accounting for income taxes by removing certain exceptions to the general rules found in Topic 740, Income Taxes. The majority of the amendments are to be applied on a prospective basis. This ASU is effective for fiscal years beginning after December 15, 2020. The Company is currently evaluating the impact of this guidance on the consolidated financial statements. ASU 2020-01, Investments-Equity Securities (Topic 321), Investments-Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815): Clarifying Interactions between Topics 321, 323 and 815. This ASU clarifies the interactions between Topic 321, Topic 323 and Topic 815, including accounting for the transition into and out of the equity method and measuring certain purchased options and forward contracts to acquire investments. The amendments in this ASU are effective for fiscal years beginning after December 15, 2020. Management is currently evaluating the impact of this guidance on the consolidated financial statements. ASU 2020-04, Reference Rate Reform (Topic 848) – Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments in this ASU provide optional expedients and exceptions to applying GAAP to contracts, hedging relationships and other transactions impacted by reference rate reform if certain criteria are met. The amendments include a one-time sale or transfer election of held-to-maturity debt securities impacted by reference rate reform. The amendments in this ASU are effective upon issuance through December 31, 2022. The Company is currently evaluating the impact of this guidance on the consolidated financial statements. ASU 2020-08, Codification Improvements to Subtopic 310-20, Receivables – Nonrefundable Fees and Other Costs. This ASU clarifies that an entity should amortize any premium, if applicable, to the next call date, which is the first date when a call option at a specified price becomes exercisable. The amendments in this ASU are effective for fiscal years beginning after December 15, 2020. Management is currently evaluating the impact of this guidance on the consolidated financial statements. ASU 2020-10, Codification Improvements. This ASU provides clarification, corrects unintended application of guidance, and makes minor improvements to various Topics that are not expected to have a significant impact on the Company’s current accounting policies and practices. Amendments within this ASU are effective for fiscal years beginning after December 15, 2020.