Loans and Asset Quality Information (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) loan	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Apr. 30, 2020 USD ($) loan
Loans and Leases Receivable Disclosure [Line Items]
Payments that exceeded carrying amount of PCI loans	$ 408,000	$ 133,000
Loan discount accretion income	336,000	112,000
Additional loan interest income	58,000	$ 21,000
Payments That Exceeded The Initial Carrying Amount On Purchased Impaired Loans, Portion Recorded As Recovery	$ 14,000
Number of Contracts	0	1
Interest income on restructured loans			$ 1,300,000
Number of loans with processed payment deferrals | loan	315
Aggregate loan balance of loans processed payment deferrals	$ 120,000,000
Deferral period	90 days
SBA Loans
Loans and Leases Receivable Disclosure [Line Items]
Remaining unaccreted discount	$ 6,800,000		7,100,000
Purchased Non-Impaired Loans
Loans and Leases Receivable Disclosure [Line Items]
Remaining unaccreted discount	10,300,000		11,100,000
Real estate – mortgage – residential (1-4 family) first mortgages
Loans and Leases Receivable Disclosure [Line Items]
Presold mortgages in process of settlement	$ 2,200,000		$ 600,000
Subsequent Event
Loans and Leases Receivable Disclosure [Line Items]
Number of loans with processed payment deferrals | loan				1,269
Aggregate loan balance of loans processed payment deferrals				$ 647,000,000