Segments (Results of Operations and Average Assets by Segment - Additional Information) (Detail)	12 Months Ended
Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements
Full-service Banking Centers	1,154
Number of business segments	4

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration