Leases - Supplemental balance sheet information related to leases (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Operating Leases:
Operating lease right-of-use assets, included in other assets	$ 12,521
Operating lease liabilities, included in other liabilities	$ 12,690
Weighted Average Remaining Lease Term:
Operating Leases	11 years
Weighted Average Discount Rate:
Operating Leases	3.50%