Summary of Significant Accounting Policies (Variable Interest Entities) (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Unfunded commitments to fund low-income housing partnerships	$ 32,676
Other Assets
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	100,500	$ 84,600
Other Liabilities
Variable Interest Entity [Line Items]
Unfunded commitments to fund low-income housing partnerships	$ 32,700	$ 21,300
Low-income housing partnerships
Variable Interest Entity [Line Items]
Period over which Federal tax credits or benefits are generally recognized (in years)	10 years
Period over which State tax credits or benefits are generally recognized (in years)	5 years
Solar energy partnerships [Member]
Variable Interest Entity [Line Items]
Period over which Federal tax credits or benefits are generally recognized (in years)	6 years