Commitments and Contingencies (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($) branches	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) branches	Sep. 30, 2018 USD ($)	Dec. 31, 2018 branches
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	63,000		63,000
Standby letters of credit expiring thereafter	20,200		20,200
Residential mortgage loan repurchase reserve liability	1,600		$ 1,600
Right to repurchase loans, period past due			90 days
GNMA Loans past due by 90 days, but not yet repurchased	$ 5,200		$ 5,200
Number of stores consolidated | branches			16		31
Number of stores sold | branches			4
Number Of Stores To Be Sold | branches	7		7
Real Estate Loans As Part Of Loan Portfolio
Concentration Risk [Line Items]
Concentration risk (as a percent)			75.00%		75.00%