Loans Receivable and Allowance for Loan Losses - Summary of Loans and Leases Modified in Troubled Debt Restructurings and Recorded Investments (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Loan	Dec. 31, 2014 USD ($) Loan	Dec. 31, 2013 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	162	21	14
Recorded Investment | $	$ 7,457	$ 1,080	$ 1,238
Commercial and industrial (including owner occupied commercial real estate)
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3
Recorded Investment | $	$ 791
Commercial real estate non-owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1
Recorded Investment | $	$ 211
Manufactured Housing
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	156	10	13
Recorded Investment | $	$ 6,251	$ 620	$ 1,206
Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2
Recorded Investment | $	$ 204
Other Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan		11	1
Recorded Investment | $		$ 460	$ 32