Nature of Operations and Summary of Significant Accounting Policies - Premises and Equipment (Details)	12 Months Ended
Dec. 31, 2019
Vehicles
Premises and Equipment
Estimated useful lives	5 years
Minimum \| Buildings
Premises and Equipment
Estimated useful lives	10 years
Minimum \| Leasehold improvements
Premises and Equipment
Estimated useful lives	5 years
Minimum \| Furniture, fixtures and equipment
Premises and Equipment
Estimated useful lives	3 years
Maximum \| Buildings
Premises and Equipment
Estimated useful lives	40 years
Maximum \| Leasehold improvements
Premises and Equipment
Estimated useful lives	39 years
Maximum \| Furniture, fixtures and equipment
Premises and Equipment
Estimated useful lives	10 years

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

Name:	us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration