Summary of Significant Accounting Policies - Premises and Equipment (Details)	12 Months Ended
Dec. 31, 2016
Buildings \| Minimum
Property, Plant and Equipment [Line Items]
Useful life	25 years
Buildings \| Maximum
Property, Plant and Equipment [Line Items]
Useful life	40 years
Furniture and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Furniture and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration