Loans (Financing receivables, non accrual status) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Nonaccrual loans	$ 59,451	$ 62,591
Nonaccrual troubled debt restructured loans	4,005	1,708
Total nonaccrual loans	63,456	64,299
Accruing loans past due 90 days or more	2,348	86
Performing troubled debt restructured loans	$ 10,040	$ 10,380