Loans, Changes in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Change in the allowance for unfunded commitments
Balance at beginning of period	$ 24,000
Balance at end of period	28,000	$ 24,000
Allowance for Unfunded Commitments:
Change in the allowance for unfunded commitments
Balance at beginning of period	24,400	24,900
Provision for unfunded commitments	4,000	(500)
Balance at end of period	$ 28,400	$ 24,400