Income Tax - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Assets:
Differences in Accounting for Loan Losses	$ 26,315	$ 25,867
Differences in Accounting for Loan Fees	1,918	762
Differences in Accounting for Loans and Securities	5,689	9,359
Deferred Compensation	3,471	5,100
Difference in Accounting for Pensions and Other Employee Benefits	83	2,247
Federal & State Income Tax Loss Carryforward and Credits	16,643	23,737
Other	4,210	9,310
Total Assets	58,329	76,382
Liabilities:
Differences in Depreciation Methods	8,216	7,742
State Income Tax	237	591
Net Unrealized Gain on Securities Available for Sale	557	6,636
Gain on FDIC Modified Whole Bank Transaction	1,126	1,405
Other	623	717
Total Liabilities	10,759	17,091
Net Deferred Tax Asset Before Valuation Allowance	47,570	59,291
Valuation allowance:
Beginning Balance	(15,736)	(17,568)
Decrease/(Increase) During the Year	5,921	1,832
Ending Balance	(9,815)	(15,736)
Net Deferred Tax Asset	$ 37,755	$ 43,555