Loans (Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loans [Abstract]
Carrying Amount of Loans, Balance at beginning of period	$ 225,838	$ 313,685
Carrying Amount of Loans, Payments received, net	(55,194)	(115,847)
Carrying Amount of Loans, Accretion	20,271	28,000
Carrying Amount of Loans, Balance at end of period	190,915	225,838
Accretable Yield, Balance at beginning of period	129,488	187,456
Accretable Yield, Payments received, net	(11,024)	(21,978)
Accretable Yield, Accretion	(20,271)	(28,000)
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flow and changes in cash flow assumptions	5,358	(4,238)
Accretable Yield, Net transfers from nonaccretable difference to accretable yield	10,135	(3,752)
Accretable Yield, Balance at end of period	$ 113,686	$ 129,488