Loans and the Allowance for Loan Losses (Details) - Loans by segment modified as troubled debt restructurings - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Recorded Investment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 13,818	$ 86,629
Additions	2,793	26,325
Payoffs/paydowns	(1,133)	(2,616)
Transfers	(580)	(96,520)
Other
Ending balance	14,898	13,818
ALLL [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance		4,500
Additions		8,250
Payoffs/paydowns
Transfers
Other		(12,750)
Ending balance