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Business Combinations - Additional Information (Detail)		3 Months Ended
	Aug. 10, 2018 USD ($) Branch	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Acquisition date		Oct. 16, 2009
Goodwill		$ 666,539,000		$ 666,539,000
Merger related expenses		$ 3,149,000	$ 803,000
Community Bank [Member]
Business Acquisition [Line Items]
Acquisition date		Aug. 10, 2018
Number of branches owned by merger company | Branch	16
Acquired assets and assumed liabilities for cash	$ 180,719,000
Assets and assumed all of the liabilities, stock	722,767,000
Goodwill	549,975,000
Core deposit intangible assets	$ 52,200,000
Percentage of core deposits to total deposits	2.26%
Merger related expenses		$ 3,100,000	$ 803,000
Gross contractual amount receivable, as of acquisition date	$ 3,000,000,000
Contractual principal cash flows, loans not expected to be collected	$ 4,500,000

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Business combination recognized identifiable assets acquired and liabilities assumed premium paid.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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