Commitments and Contingencies (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) properties store	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) properties store	Jun. 30, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Number of non-cancelable operating leases | properties	274		274
Rent expense	$ 9,500	$ 9,600	$ 19,200	$ 19,000
Rent income	502	$ 284	1,000	$ 561
Standby letters of credit that expire within one year	45,800		45,800
Standby letters of credit that expire thereafter	19,000		19,000
Standby letters of credit, fees	262		372
Residential mortgage loan repurchase reserve liability	$ 2,000		$ 2,000
Number of store locations to be consolidated | store	26		26
Concentration risk, percentage			77.00%	78.00%