Tax Credit Investments Tax Credit Investments - Affordable Housing Tax Credit Investments, Other Tax Credit Investments, and Related Unfunded Commitments (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Other Assets
Other Assets:
Affordable housing tax credit investments, net	$ 30,375	$ 32,094
Other tax credit investments, net	60,062	70,681
Total tax credit investments, net	90,437	102,775
Other Liabilities
Other Liabilities:
Unfunded affordable housing tax credit commitments	5,330	7,330
Unfunded other tax credit commitments	7,428	12,545
Total unfunded tax credit commitments	$ 12,758	$ 19,875