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Accrued Interest and Other Assets (Narratives) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Other assets [Line Items]    
Other prepaid expenses $ 17,117 $ 17,096
Prepaid Taxes 11,700 12,500
Core deposit intangible 3,800 4,300
Other repossessed assets 3,225 3,224
Repossessed auto 3,000 3,000
Mortgage tax credits 6,277 6,277
Customer Relationships Intangible [Member]    
Other assets [Line Items]    
Core deposit intangible $ 1,600 $ 1,900