Tax Credit Investments Tax Credit Investments - Affordable Housing Tax Credit Investments, Other Tax Credit Investments, and Related Unfunded Commitments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Other Assets
Other Assets [Abstract]
Affordable housing tax credit investments, net	$ 30,536	$ 32,094
Other tax credit investments, net	57,329	70,681
Total tax credit investments, net	87,865	102,775
Other Liabilities
Other Liabilities [Abstract]
Unfunded affordable housing tax credit commitments	6,760	7,330
Unfunded other tax credit commitments	655	12,545
Total unfunded tax credit commitments	$ 7,415	$ 19,875