Low Income Housing Tax Credit Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Affordable Housing Tax Credit Investments, Unfunded Commitment [Abstract]
2017	$ 3,173		$ 3,173
2018	8,526		8,526
2019	5,947		5,947
2020	27		27
2021	9		9
Thereafter	425		425
Total Unfunded Commitments	18,107		18,107
Effective Yield Method
Tax credits and other tax benefits recognized	3,439	$ 3,516	6,869	$ 7,032
Amortization Expense in Provision for Income Taxes	2,137	2,174	4,298	4,348
Proportional Amortization Method
Tax credits and other tax benefits recognized	440	259	761	518
Amortization Expense in Provision for Income Taxes	358	$ 200	611	400
Net affordable housing tax credit investments and related unfunded commitments	$ 66,900		66,900		$ 66,600
Write down from impairment of LIHTC Investments			$ 0	$ 0