Commitments and Contingencies (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) branches	Jun. 30, 2018 USD ($)	Dec. 31, 2018 branches
Commitments and Contingencies Disclosure [Abstract]
Standby letters of credit, financial guarantees required to perform on	$ 0	$ 0	$ 0	$ 0
Standby letters of credit that expire within one year	50,800		50,800
Standby letters of credit that expire thereafter	13,100		13,100
Residential mortgage loan repurchase reserve liability	1,700		$ 1,700
Days past due of GNMA loans available for repurchase			90 days
GNMA Loans past due by 90 days, but not yet repurchased	$ 5,400		$ 5,400
Number Of Stores Consolidated | branches			15		31
Number of Stores Sold | branches			4
Real Estate Loans As Part Of Loan Portfolio
Concentration Risk [Line Items]
Concentration risk, percentage			75.00%		75.00%