Goodwill and Intangibles - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 32,507	$ 33,861
Accumulated Amortization	(8,531)	(10,153)
Total	23,976	23,708
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	10,658	13,128
Accumulated Amortization	(3,720)	(5,630)
Total	$ 6,938	$ 7,498
Amortization Period	10 years	10 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 17,561	$ 17,561
Accumulated Amortization	(3,413)	(2,612)
Total	14,148	14,949
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	221	1,006
Accumulated Amortization	(35)	(728)
Total	$ 186	278
Amortization Period	5 years
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 2,135	1,708
Accumulated Amortization	(1,103)	(1,067)
Total	1,032	641
Favorable lease asset
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	1,932	458
Accumulated Amortization	(260)	(116)
Total	$ 1,672	$ 342
Minimum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization Period	7 years	7 years
Minimum | Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortization Period		6 months
Minimum | Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Amortization Period	10 years	10 years
Minimum | Favorable lease asset
Finite-Lived Intangible Assets [Line Items]
Amortization Period	10 months	10 months
Maximum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization Period	15 years	15 years
Maximum | Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortization Period		5 years
Maximum | Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Amortization Period	30 years	30 years
Maximum | Favorable lease asset
Finite-Lived Intangible Assets [Line Items]
Amortization Period	18 years	15 years