The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Summary of Significant Accounting Policies - Corporate Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Premises and equipment
Depreciation	$ 3,220	$ 2,770	$ 2,670
Building \| Minimum
Premises and equipment
Property, Plant and Equipment, Useful Life	10 years
Building \| Maximum
Premises and equipment
Property, Plant and Equipment, Useful Life	40 years
Equipment, Furniture and Fixtures \| Minimum
Premises and equipment
Property, Plant and Equipment, Useful Life	3 years
Equipment, Furniture and Fixtures \| Maximum
Premises and equipment
Property, Plant and Equipment, Useful Life	10 years