Summary of Significant Accounting Policies (Mortgage Servicing and Transfers of Financial Assets and Servicing Rights, Net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items]
Aggregate unpaid principal balance	$ 616,700	$ 648,900
Mortgage Servicing Rights 15 Year
Servicing Asset at Amortized Cost [Line Items]
Servicing rights, valuation allowance	$ 114	$ 20
Servicing rights, term	15 years	15 years
Mortgage Servicing Rights 30 Year
Servicing Asset at Amortized Cost [Line Items]
Servicing rights, valuation allowance	$ 797	$ 38
Servicing rights, term	30 years	30 years