Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Financial guarantees in connection with standby letters of credit	$ 0	$ 0	$ 0	$ 0
Standby letters of credit expiring within one year	89,700		89,700
Standby letters of credit expiring thereafter	10,600		10,600
Residential mortgage loan repurchase reserve liability	1,700		$ 1,700
Right to repurchase loans, period past due			90 days
GNMA Loans past due by 90 days, but not yet repurchased	$ 2,600		$ 2,600
Real Estate Loans As Part Of Loan Portfolio
Concentration Risk [Line Items]
Concentration risk (as a percent)			70.00%		76.00%