Agreement and Plan of Merger - Additional Information (Detail) (FNB Corporation [Member])	0 Months Ended
Feb. 19, 2013
FNB Corporation [Member]
Loans At Acquisition Date [Line Items]
Exchange Ratio of shares in acquisition	0.3405
Common shares trading period	20 days

Business acquisition equity interest issued or issuable trading period.

No definition available.

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Period Type:	duration