Premises and Equipment - Summary of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Premises and Equipment [Line Items]
Total Cost	$ 205,026	$ 206,863
Accumulated Depreciation and Amortization	(110,594)	(109,215)
Net	94,432	97,648
Land
Premises and Equipment [Line Items]
Total Cost	25,035	26,510
Buildings and Leasehold Improvements
Premises and Equipment [Line Items]
Total Cost	114,444	115,461
Equipment
Premises and Equipment [Line Items]
Total Cost	$ 65,547	$ 64,892