Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Premises and equipment, net
Premises and equipment, gross	$ 92,107	$ 102,147
Accumulated depreciation and amortization	(47,650)	(55,365)
Premises and equipment, net	44,457	46,782
Depreciation and amortization expense
Depreciation and amortization expense	3,600	3,900	$ 3,700
Land [Member]
Premises and equipment, net
Premises and equipment, gross	13,235	14,058
Buildings and improvements [Member]
Premises and equipment, net
Premises and equipment, gross	45,484	47,542
Furniture and equipment [Member]
Premises and equipment, net
Premises and equipment, gross	32,619	39,641
Leasehold improvements [Member]
Premises and equipment, net
Premises and equipment, gross	$ 769	$ 906