Goodwill and Other Amortizing Intangible Assets - Summarized Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 28,126	$ 22,511
Accumulated Amortization	(13,100)	(9,946)
Net Intangible Assets	15,026	12,565
Customer deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	25,843	20,228
Accumulated Amortization	(11,760)	(8,877)
Net Intangible Assets	14,083	11,351
Customer list intangible
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	2,283	2,283
Accumulated Amortization	(1,340)	(1,069)
Net Intangible Assets	$ 943	$ 1,214