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Loans Receivable, Net - Summary of Loans Individually Evaluated for Impairment by Loan Portfolio Segment Excluding PCI Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 29,800 $ 47,000
Allowance for Loan Losses Allocated 0  
With No Related Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 33,538 50,076
Recorded Investment 29,797 46,988
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 36,824 34,674
Interest Income Recognized 1,416 2,250
With an Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 0 0
Recorded Investment 0 0
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 1,259 5,090
Interest Income Recognized 0 149
Commercial and industrial | With No Related Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,750 895
Recorded Investment 1,626 864
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 1,075 643
Interest Income Recognized 107 60
Commercial and industrial | With an Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 0 0
Recorded Investment 0 0
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 589 0
Interest Income Recognized 0 0
Commercial real estate - owner occupied | With No Related Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 5,413 15,832
Recorded Investment 5,395 15,132
Allowance for Loan Losses Allocated 0  
Average Recorded Investment 8,264 11,890
Interest Income Recognized 297 797
Commercial real estate - owner occupied | With an Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 0 0
Recorded Investment 0 0
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 0 0
Interest Income Recognized 0 0
Commercial real estate – investor | With No Related Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 12,633 19,457
Recorded Investment 9,738 17,923
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 13,934 8,825
Interest Income Recognized 382 768
Commercial real estate – investor | With an Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 0 0
Recorded Investment 0 0
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 670 3,386
Interest Income Recognized 0 81
Residential mortgage | With No Related Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 10,441 10,951
Recorded Investment 10,064 10,605
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 10,787 10,928
Interest Income Recognized 475 481
Residential mortgage | With an Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 0 0
Recorded Investment 0 0
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 0 1,585
Interest Income Recognized 0 62
Consumer | With No Related Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,301 2,941
Recorded Investment 2,974 2,464
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 2,764 2,388
Interest Income Recognized 155 144
Consumer | With an Allowance Recorded    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 0 0
Recorded Investment 0 0
Allowance for Loan Losses Allocated 0 0
Average Recorded Investment 0 119
Interest Income Recognized $ 0 $ 6