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Acquired SJB Assets and FDIC Loss Sharing Asset - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Business Combinations [Abstract]
Acquisition date	Oct. 16, 2009
Remaining discount associated with SJB loans	$ 0.0
Claims submitted for net losses on PCI loans	$ 118.9

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- Definition

Claims submitted for losses on purchased credit impaired loans.

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- Definition

The purchase accounting discount associated with loans acquired in an FDIC assisted acquisition.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
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