Accrued Interest and Other Assets (Other assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Other asset
Other prepaid expenses	$ 12,762	$ 9,200
Other repossessed assets	4,146	3,548
Core deposit intangible and customer relationship intangibles	3,697	4,687
Mortgage tax credits	2,277	4,277
Investment in Statutory Trust	1,083	1,083
Accounts receivable and other assets	37,951	41,898
Other assets	$ 61,916	$ 64,693