Low Income Housing Tax Credit Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Affordable Housing Tax Credit Investments, Unfunded Commitment [Abstract]
2019	$ 3,050			$ 3,050
2020	8,317			8,317
2021	42			42
2022	49			49
2023	42			42
Thereafter	1,281			1,281
Total Unfunded Commitments	12,781			12,781
Effective Yield Method
Tax credits and other tax benefits recognized	2,930	$ 3,380		5,859	$ 6,812
Amortization Expense in Provision for Income Taxes	1,891	2,078		3,783	4,155
Proportional Amortization Method
Tax credits and other tax benefits recognized	753	410		1,507	820
Amortization Expense in Provision for Income Taxes	645	$ 333		1,289	666
Net affordable housing tax credit investments and related unfunded commitments	$ 68,600			68,600		$ 73,700
Write down from impairment of LIHTC Investments				$ 0	$ 0
Low income housing investment partnerships basis adjustments, provision income tax expense			$ 2,000