Organization (Details Textual)	3 Months Ended
	Mar. 31, 2017 USD ($) bank_branch acquisition
Business Acquisition [Line Items]
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change of Income Taxes | $	$ 1,100,000
General Introduction [Abstract]
Number of businesses acquired | acquisition	28
CALIFORNIA
General Introduction [Abstract]
Retail branch locations | bank_branch	74
NORTH CAROLINA
General Introduction [Abstract]
Retail branch locations | bank_branch	1
Retained Earnings
Business Acquisition [Line Items]
Cumulative effect of change in accounting principle | $	$ 420,000