Acquisition Activity (Schedule of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands		12 Months Ended
	May 01, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Other assets	$ 4,397
Total assets	270,767
Total liabilities	3,620
Estimated fair value of net assets acquired	267,147
Consideration issued	277,553	$ 0	$ 277,553	$ 0
Excess of consideration issued over fair value of net assets acquired	10,406
Loans held for investment
Business Acquisition [Line Items]
Loans	173,809
Loans held for sale
Business Acquisition [Line Items]
Loans	82,143
Commercial Servicing Rights [Member]
Business Acquisition [Line Items]
Servicing rights	$ 10,418