Borrowed Funds - Scheduled FHLB Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Due in one year or less	$ 489,169
Due after one year through two years	146,240
Due after two years through three years	131,000
Due after three years through four years	0
Thereafter	0
Total FHLB advances	$ 766,409	$ 1,037,960