Loans Receivable, Net - Recorded Investment in Non-Accrual Loans by Loan Portfolio Segment Excluding PCI Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	$ 17,453	$ 17,415
Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	207	1,587
Commercial real estate – owner occupied
Financing Receivable, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	4,537	501
Commercial real estate – investor
Financing Receivable, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	4,073	5,024
Residential real estate
Financing Receivable, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	5,953	7,389
Consumer
Financing Receivable, Past Due [Line Items]
Recorded Investment in Non-accrual Loans	$ 2,683	$ 2,914