Tax Credit Investments Tax Credit Investments - Affordable Housing Tax Credit Investments, Other Tax Credit Investments, and Related Unfunded Commitments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets
Other Assets:
Affordable housing tax credit investments, net	$ 36,961	$ 22,135
Other tax credit investments, net	68,052	42,015
Total tax credit investments, net	105,013	64,150
Other Liabilities
Other Liabilities:
Unfunded affordable housing tax credit commitments	4,520	3,690
Unfunded other tax credit commitments	8,756	15,020
Total unfunded tax credit commitments	$ 13,276	$ 18,710