Organization and Summary of Significant Accounting Policies - Allowance for Loan and Lease Losses (Details)	12 Months Ended
	Dec. 31, 2018 component
Allowance for loan and lease losses
Reserve for credit losses, number of components	2
Consumer | Minimum
Allowance for loan and lease losses
Threshold period past due for charge-off	120 days
Consumer | Maximum
Allowance for loan and lease losses
Threshold period past due for charge-off	180 days