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Contractual Obligations and Off-Balance Sheet Items - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]  
Operating lease, right-of-use asset $ 16,000
Operating lease, liability $ 16,000
Operating lease, weighted average remaining lease term 5 years 4 months 24 days
Operating lease weighted average discount rate, percent 3.40%
Operating lease, payments $ 1,400
Minimum [Member]  
Contractual Obligations And Off Balance Sheet Items [Line Items]  
Lessee operating lease remaining lease term 1 year
Maximum [Member]  
Contractual Obligations And Off Balance Sheet Items [Line Items]  
Lessee operating lease remaining lease term 13 years
Federal Home Loan Bank Advance And Notes Payable [Member]  
Contractual Obligations And Off Balance Sheet Items [Line Items]  
Interest payable $ 85