Accounting Standards Updates Accounting Standards Update (Narrative) (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption		$ (14,672)	$ (2,285)
Minimum [Member] | Forecast [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage increase in allowance for loan losses and reserve for unfunded commitments	20.00%
Maximum [Member] | Forecast [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage increase in allowance for loan losses and reserve for unfunded commitments	35.00%
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption		$ (14,672)	$ (2,285)