Tax Credit Investments - Balance Sheet Disclosures (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other Assets
Other Assets:
Affordable housing tax credit investments, net	$ 28,559	$ 29,567
Other tax credit investments, net	36,204	44,763
Total tax credit investments, net	64,763	74,330
Other Liabilities
Other Liabilities:
Unfunded affordable housing tax credit commitments	4,690	4,850
Unfunded other tax credit commitments	3,582	7,276
Total unfunded tax credit commitments	$ 8,272	$ 12,126