Significant Events	6 Months Ended
Significant Events	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Significant Events	SIGNIFICANT EVENTS COVID-19 Pandemic The COVID-19 pandemic began impacting the U.S. and global economies in the first calendar quarter of 2020. In March 2020, the U.S. declared a national emergency and imposed travel restrictions, limitations of business operations in certain industries, and other efforts in order to impede the spread of COVID-19. Since the onset of this pandemic, macroeconomic conditions and markets have significantly deteriorated. In response to the impacts of COVID-19 on individuals and businesses, the U.S. federal government enacted the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") on March 27, 2020. The goal of the CARES Act is to prevent a severe economic downturn through various measures, including direct financial aid to American families and economic stimulus to significantly impacted industry sectors. Accommodations to Borrowers The Company is actively participating in the Paycheck Protection Program ("PPP"), which is being administered by the Small Business Administration ("SBA"). It is the Company's understanding that loans funded through the PPP program are fully guaranteed by the U.S. government and that a portion of these loans will ultimately be forgiven by the SBA in accordance with the terms of the program. As of May 4, 2020, the Company authorized 673 applications, totaling $215.4 million in PPP loan requests as part of the program. In response to the COVID-19 pandemic impact on customers, the Company is engaging in more frequent communication with borrowers to better understand their situation and challenges and has begun offering credit-worthy borrowers experiencing temporary hardship certain loan and lease modifications ("COVID modifications"), such as payment deferrals, as a result of interagency guidance issued on March 22, 2020 encouraging companies to work with customers impacted by COVID-19. The Company elected to treat COVID modifications on leases as part of the enforceable rights and obligations of the parties under the existing lease contract, resulting in these payment deferrals being treated as variable lease payments under the existing lease versus lease modifications. Additionally, for COVID modifications on loans, the Company adjusted its effective interest rate to reflect the payment deferral modification and continued accruing interest during this period. Short term payment deferral modifications of $267.9 million and $71.9 million in other COVID-19 related modifications were completed by the Company through May 4, 2020. Financial Impact The Company recorded $15.8 million of provision for loan and lease losses during the three months ended March 31, 2020 directly related to the initial estimate, based on available information, of probable incurred losses resulting from the impact of the COVID-19 pandemic. As the Company obtains additional information on the macroeconomic reactions and impact on borrowers, the provision estimate will be revised as necessary in future periods to maintain an appropriate and supportable level. The Company’s approach to estimating the COVID-19 impact on credit quality is presented in Note 6. Loans and Leases, Net. The Company's interest and fee income could be reduced as a result of COVID-19. While interest and fees will continue to accrue in accordance with GAAP, a decrease in loan demand could lead to slower loan growth or even a contraction in loan balances in the near term. In addition, should eventual credit losses emerge, interest income and fees accrued may need to be reversed in future periods. At this time, the Company is unable to project the materiality of such an impact. No additional significant financial impacts directly related to COVID-19 were identified for the three months ended March 31, 2020. Asset Valuation In March 2020, the Company assessed its financial assets potentially impacted by the deteriorating market conditions due to the COVID-19 outbreak occurring globally. Included in the assessment were the loan and lease portfolios, other-than-temporary impairment ("OTTI") in investment portfolios, collectability of operating lease payments, goodwill impairment and intangible asset impairment. Based on the known events and circumstances at the time of the assessment, the Company has determined no impairment is needed as of March 31, 2020, other than the provision for loan and lease losses noted above. The Company will continue to observe and monitor the pandemic-related circumstances to determine whether further impairment assessments are needed in future periods. In the event it is determined that all or a portion of its goodwill or intangible assets is impaired, a non-cash charge for the amount of such impairment would be recorded to earnings, but would not impact regulatory capital.