Note FDIC loss share (expense) income - Additional Information (Detail)	9 Months Ended
Sep. 30, 2017
F D I C Loss Share Expense Income [Line Items]
Limited Period For The F D I C Loss Sharing Agreements Covered For Interest Not Collected	approximately 90 days

Limited Period For The FDIC Loss Sharing Agreements Covered For Interest Not Collected From Borrowers

No definition available.

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Period Type:	duration