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Accrued Interest and Other Assets (Narratives) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Other assets [Line Items]    
Other prepaid expenses $ 12,762 $ 9,200
Prepaid Taxes 7,300 5,700
Core deposit intangible 2,700 3,300
Other repossessed assets 4,146 3,548
Mortgage tax credits 2,277 4,277
Customer Relationships Intangible [Member]    
Other assets [Line Items]    
Core deposit intangible $ 1,000 $ 1,400