Fair Value Measurements (Fair Value Measurement and Assumptions) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Assets:
Impaired Loans	$ 1,935	$ 2,955
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Impaired commercial collateral dependent receivables appraisals to determine fair value within immediately preceding twelve months	577	1,426
Impaired collateral dependent commercial loans with internal evaluation completed within last twelve months	812	847
Charges to allowance for probable loan losses in connection with other real estate owned	4	9,611
Adjustment to fair value in connection with other real estate owned	537	322
Measured on a non-recurring basis
Non-financial assets:
Equity investments without readily determinable fair values		4,775
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Change in net provision, impaired loans		43
Change in net provision, other real estate owned	537	322
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Impaired Loans		826
Non-financial assets:
Other real estate owned	2,581	21,614
Equity investments without readily determinable fair values		28,166
Measured on a non-recurring basis | Assets/liabilities measured at fair value
Assets:
Impaired Loans		826
Non-financial assets:
Other real estate owned	2,581	21,614
Equity investments without readily determinable fair values		$ 28,166
Watch List - Doubtful | Measured on a non-recurring basis
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Change in net provision, impaired loans	93
Watch List - Doubtful | Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Impaired Loans	254
Watch List - Doubtful | Measured on a non-recurring basis | Assets/liabilities measured at fair value
Assets:
Impaired Loans	$ 254