Tax Credit Investments - Balance Sheet Disclosures (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Assets
Other Assets
Affordable housing tax credit investments, net	$ 26,397	$ 29,567
Other tax credit investments, net	40,191	44,763
Total tax credit investments, net	66,588	74,330
Other Liabilities
Other Liabilities
Unfunded affordable housing tax credit commitments	3,690	4,850
Unfunded other tax credit commitments	10,194	7,276
Total unfunded tax credit commitments	$ 13,884	$ 12,126