Loans Receivable and Allowance for Loan Losses - Summary of Loans Modified in Troubled Debt Restructurings and Related Recorded Investment (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Loan	Mar. 31, 2015 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of loans modified in troubled debt restructurings | Loan	26	3
Recorded investment | $	$ 2,859	$ 405
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of loans modified in troubled debt restructurings | Loan	1	0
Recorded investment | $	$ 76	$ 0
Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Number of loans modified in troubled debt restructurings | Loan	1	0
Recorded investment | $	$ 1,844	$ 0
Manufactured housing
Financing Receivable, Modifications [Line Items]
Number of loans modified in troubled debt restructurings | Loan	23	2
Recorded investment | $	$ 864	$ 207
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of loans modified in troubled debt restructurings | Loan	1	1
Recorded investment | $	$ 75	$ 198