Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Apr. 06, 2018	Dec. 31, 2017
Goodwill
Goodwill	$ 167,420,000	$ 83,753,000		$ 45,664,000
Goodwill acquired	83,667,000	38,089,000
Tri Valley Bank
Goodwill
Goodwill			$ 13,819,000
United American Bank
Goodwill
Goodwill	24,270,000
Presidio bank
Goodwill
Goodwill	83,667,000
Banking
Goodwill
Goodwill	154,376,000	70,709,000		32,620,000
Factoring
Goodwill
Goodwill	$ 13,044,000	$ 13,044,000		$ 13,044,000