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Recent Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands | Jul. 01, 2019 | Sep. 30, 2019
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Operating lease, right-of-use asset |  | $ 16,400
Operating lease, liability |  | 16,936
ASU 2016-13 [Member] |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Business combination loans acquired |  | 1,040,000
Allowance for acquired loans |  | $ 0
ASU 2016-02 [Member] |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Operating lease, right-of-use asset | $ 17,200 |
Operating lease, liability | 17,800 |
ASU 2019-04 [Member] |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Reclassification of investment securities held to maturity to investment securities available for sale | $ 537,700 |

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- Definition Amount before tax and reclassification adjustments of unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e709-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118985780&loc=d3e24883-111560 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 10 -Subparagraph (c),(d) -URI http://asc.fasb.org/extlink&oid=118985780&loc=d3e24820-111560 + Details
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