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Recent Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands	Jul. 01, 2019	Sep. 30, 2019
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

The allowance for loan losses on acquired loans.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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Amount of lessee's right to use underlying asset under operating lease.

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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.

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