Low Income Housing Tax Credit Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Affordable Housing Tax Credit Investments, Unfunded Commitment [Abstract]
2019	$ 2,923			$ 2,923
2020	12,370			12,370
2021	44			44
2022	69			69
2023	45			45
Thereafter	1,417			1,417
Total Unfunded Commitments	16,868			16,868
Effective Yield Method
Tax credits and other tax benefits recognized	2,930	$ 3,380		8,789	$ 10,192
Amortization Expense in Provision for Income Taxes	1,891	2,078		5,674	6,233
Proportional Amortization Method
Tax credits and other tax benefits recognized	753	410		2,260	1,231
Amortization Expense in Provision for Income Taxes	645	$ 333		1,934	999
Net affordable housing tax credit investments and related unfunded commitments	$ 71,900			71,900		$ 73,700
Write down from impairment of LIHTC Investments				$ 0	$ 0
Low income housing investment partnerships basis adjustments, provision income tax expense			$ 2,000