Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Line Items]
Modified loan terms	6 months
Loan And Leases Due Period For Discontinuation Of Interest Accrual	90 days
Consumer Loans Charged Off Period	120 days
Building [Member] | Maximum [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Building [Member] | Minimum [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	25 years
Leasehold Improvements [Member] | Maximum [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	25 years
Leasehold Improvements [Member] | Minimum [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Furniture and Equipment [Member] | Maximum [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	12 years
Furniture and Equipment [Member] | Minimum [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years