Loans and Allowance for Loan Losses (Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Loans and Allowance for Loan Losses [Abstract]
Carrying Amount of Loans, Balance at beginning of period	$ 225,838	$ 313,685
Carrying Amount of Loans, Payments received, net	(39,446)	(115,847)
Carrying Amount of Loans, Accretion	15,400	28,000
Carrying Amount of Loans, Balance at end of period	201,792	225,838
Accretable Yield, Balance at beginning of period	129,488	187,456
Accretable Yield, Payments received, net	(7,575)	(21,978)
Accretable Yield, Accretion	(15,400)	(28,000)
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flows and changes in cash flow assumptions	5,352	(4,238)
Accretable Yield, Net transfers to (from) nonaccretable difference to accretable yield	10,675	(3,752)
Accretable Yield, Balance at end of period	$ 122,540	$ 129,488