Lease Commitments - Lease Information (Details)	9 Months Ended
	Sep. 30, 2019 USD ($) lease
Lease information
Lease, Practical Expedients, Package [true false]	true
Lease, Practical Expedient, Use of Hindsight [true false]	true
Number of leases for administrative offices and branch locations	8
Number of operating leases	7
Number of finance leases	1
Options to renew	true
Renewal term of the lease	5 years
Maximum
Lease information
Initial term of leases not recorded on the balance sheet	12 months
Threshold of discounted present value of future cash flows below which a lease is not recorded on the balance sheet | $	$ 25,000
Term of lease including available lease renewal options	15 years