Other Assets - Summary of Other Assets (Detail) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred tax asset, net	$ 36,199,000	$ 36,440,000
Prepaid expense	3,045,000	3,062,000
Software	2,039,000	1,290,000
Advanced compensation	249,000	673,000
Capital Trusts	1,702,000	1,696,000
Investment in Low Housing Tax Credit Funds	18,465,000	4,223,000	$ 0
Life insurance proceeds receivable	2,120,000
Prepaid Taxes	6,460,000
Premises held for sale	2,896,000
Miscellaneous other assets	1,568,000	1,207,000
Total other assets	$ 74,743,000	$ 48,591,000