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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
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Recorded Investment $ 44,060   $ 46,988
Allowance for Loan Losses Allocated 1,605   0
With No Related Allowance Recorded      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 41,186   50,076
Recorded Investment 39,235   46,988
Average Recorded Investment 43,112 $ 25,020  
Interest Income Recognized 447 306  
With an Allowance Recorded      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 5,329   0
Recorded Investment 4,825   0
Allowance for Loan Losses Allocated 1,605   0
Average Recorded Investment 2,413 8,173  
Interest Income Recognized 0 123  
Residential Real Estate | With No Related Allowance Recorded      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 11,820   10,951
Recorded Investment 11,406   10,605
Average Recorded Investment 11,006 9,227  
Interest Income Recognized 125 86  
Residential Real Estate | 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 3,962  
Interest Income Recognized 0 62  
Commercial Real Estate - Owner Occupied | With No Related Allowance Recorded      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 9,920   15,832
Recorded Investment 9,811   15,132
Average Recorded Investment 12,471 10,943  
Interest Income Recognized 115 161  
Commercial Real Estate - Owner Occupied | With an Allowance Recorded      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance     0
Recorded Investment     0
Allowance for Loan Losses Allocated     0
Average Recorded Investment 0 0  
Interest Income Recognized   0  
Commercial Real Estate - Investor | With No Related Allowance Recorded      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 15,669   19,457
Recorded Investment 14,732   17,923
Average Recorded Investment 16,328 2,340  
Interest Income Recognized 154 26  
Commercial Real Estate - Investor | With an Allowance Recorded      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 3,857   0
Recorded Investment 3,353   0
Allowance for Loan Losses Allocated 930   0
Average Recorded Investment 1,677 3,914  
Interest Income Recognized 0 55  
Consumer | With No Related Allowance Recorded      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 2,970   2,941
Recorded Investment 2,489   2,464
Average Recorded Investment 2,477 2,242  
Interest Income Recognized 37 28  
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 0 297  
Interest Income Recognized 0 6  
Commercial and Industrial | With No Related Allowance Recorded      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 807   895
Recorded Investment 797   864
Average Recorded Investment 830 268  
Interest Income Recognized $ 16 5  
Commercial and Industrial | With an Allowance Recorded      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance     0
Recorded Investment     0
Allowance for Loan Losses Allocated     $ 0
Average Recorded Investment   $ 0