Goodwill and Intangibles - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 32,193	$ 33,861
Accumulated Amortization	(7,781)	(10,153)
Total	24,412	23,708
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	10,658	13,128
Accumulated Amortization	(3,440)	(5,630)
Total	$ 7,218	$ 7,498
Finite-Lived Intangible Asset, Useful Life	10 years	10 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 17,561	$ 17,561
Accumulated Amortization	(3,013)	(2,612)
Total	14,548	14,949
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	221	1,006
Accumulated Amortization	(24)	(728)
Total	$ 197	278
Finite-Lived Intangible Asset, Useful Life	5 years
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 1,821	1,708
Accumulated Amortization	(1,092)	(1,067)
Total	729	641
Favorable lease asset
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	1,932	458
Accumulated Amortization	(212)	(116)
Total	$ 1,720	$ 342
Minimum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years	7 years
Minimum | Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life		6 months
Minimum | Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years	10 years
Minimum | Favorable lease asset
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 months	10 months
Maximum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	15 years
Maximum | Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life		5 years
Maximum | Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	30 years	30 years
Maximum | Favorable lease asset
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	18 years	15 years