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Significant Event (Narrative) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Extraordinary And Unusual Items Abstract
Incurred costs due to hurricane		$ 2,200,000
Insurance reimbursement	$ 700	1,000,000
Other assets receivable from insurance	500	1,200,000
Estimated total losses		$ 6,600,000
Provision for loan losses to replenish the allowance for loan charge-offs	8,600,000
Charge-offs related to the hurricanes.	$ 8,200,000