Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 22, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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
Net Operating Loss Carryforward Limit Percentage	80.00%
Effective Income Tax Rate Reconciliation, Deduction, Net Interest Expenses	30.00%
Deferred Income Tax Expense (Benefit)			$ 35,827	$ 14,206	$ 12,888
Other Comprehensive Income Loss Reclassification Adjustment Of Disappropriate Tax Effects Upon Adoption Of New Accounting Prounouncement From AOCI To Retained Earnings			$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%	35.00%	35.00%
Scenario, Plan [Member]
Accounting Policies [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
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