Loans - Impaired Loans Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Impaired loans summary
Nonaccrual loans	$ 37,541	$ 2,127
Accruing loans past due 90 days or more	52	16
Restructured loans - nonaccrual	1,464	2,717
Restructured loans - accruing	5,988	2,257
Total nonperforming loans	45,045	7,117
Impaired loans, other infomation
Nonaccrual loans, interest recognized	364	667	$ 373
Total nonaccrual loans	39,000	4,800
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	$ 806	$ 401	$ 657