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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Goodwill |  |
Goodwill, beginning of period | $ 301,368 | $ 301,368
Additions | 1,339 | 0
Goodwill, end of period | 302,707 | 301,368
Core Deposit and Other Intangibles |  |
Intangible assets, beginning of period | 7,879 | 9,918
Additions | 1,471 | 0
Amortization | (2,151) | (2,039)
Intangible assets, end of period | 7,199 | 7,879
Total |  |
Goodwill and intangible assets, beginning of period | 309,247 | 311,286
Additions | 2,810 | 0
Amortization | (2,151) | (2,039)
Goodwill and intangible assets, end of period | $ 309,906 | $ 309,247

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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