Organization (Details Textual) $ in Thousands			3 Months Ended	9 Months Ended
		Jan. 01, 2019 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2019 acquisition bank_branch
Business Acquisition [Line Items]
Number of Businesses Acquired | acquisition				29
Cumulative effect of change in accounting principle | $	[1]	$ 938	$ 0
CALIFORNIA
Business Acquisition [Line Items]
Retail Branch Locations				74
NORTH CAROLINA
Business Acquisition [Line Items]
Retail Branch Locations				1

[1] Impact due to adoption on January 1, 2019 of ASU 2016-02, "Leases (Topic 842)," and the related amendments.