Supplemental Cash Flow (Details) - USD ($)		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Supplemental financial data:
Cash paid for: interest		$ 5,000,000	$ 5,100,000
Cash paid for: income taxes		3,292,000	1,012,000
Cash paid for: lease liability		322,000	288,000
Supplemental schedule of non-cash activity:
Net purchases of investment securities not yet settled		0	1,500,000
Transfer from loans to other real estate owned		0	255,000
ROU lease assets: operating leases(1)	[1]	$ 0	$ 19,002,000

[1] This represents the ROU lease asset that was recorded upon adoption of ASC 842 in 2019 and new leases added in the periods indicated