Acquisitions and FDIC Indemnification Asset (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Assets	$ 4,062,414,000	$ 4,023,250,000
Goodwill	78,592,000	78,592,000
Loans and Leases Receivable, Net of Loans with Deteriorated Credit Quality, Covered	2,800,000	$ 3,200,000
First National Bank Of Danville [Member]
Business Acquisition [Line Items]
Reimbursements from the FDIC	19,400,000
Business Aquisition, Loss Sharing Agreement Losses On Assets Threshold	$ 29,000,000
Business Acquisition Loss Sharing Agreement Losses In Excess Of Threshold To Be Reimbursed Percentage	95.00%
Business Acquisition, Loss Sharing Agreement Losses Up To Threshold To Be Reimbursed Percentage	80.00%