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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Recorded Investment $ 44,927   $ 44,927   $ 31,042
Allowance for Loan Losses Allocated 616   616   510
With No Related Allowance Recorded          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 42,931   42,931   26,832
Recorded Investment 40,386   40,386   25,228
Average Recorded Investment 38,558 $ 33,539 31,595 $ 33,452  
Interest Income Recognized 765 337 1,564 957  
With an Allowance Recorded          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 4,556   4,556   6,590
Recorded Investment 4,541   4,541   5,814
Allowance for Loan Losses Allocated 616   616   510
Average Recorded Investment 4,551 1,003 6,362 863  
Interest Income Recognized 13 1 149 3  
Residential Real Estate | With No Related Allowance Recorded          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 12,896   12,896   9,848
Recorded Investment 12,484   12,484   9,694
Average Recorded Investment 12,791 13,451 11,009 13,326  
Interest Income Recognized 128 171 401 437  
Residential Real Estate | With an Allowance Recorded          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 0   0   3,998
Recorded Investment 0   0   3,612
Allowance for Loan Losses Allocated 0   0   266
Average Recorded Investment 0 107 1,981 108  
Interest Income Recognized 0 1 62 3  
Commercial Real Estate - Owner Occupied | With No Related Allowance Recorded          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 12,233   12,233   11,886
Recorded Investment 11,537   11,537   11,123
Average Recorded Investment 11,217 17,198 11,080 17,333  
Interest Income Recognized 335 119 520 406  
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 0 0  
Interest Income Recognized   0   0  
Commercial Real Estate - Investor | With No Related Allowance Recorded          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 13,938   13,938   2,239
Recorded Investment 12,994   12,994   1,897
Average Recorded Investment 11,147 281 6,550 303  
Interest Income Recognized 240 3 487 9  
Commercial Real Estate - Investor | With an Allowance Recorded          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 4,556   4,556   2,011
Recorded Investment 4,541   4,541   1,892
Allowance for Loan Losses Allocated 616   616   119
Average Recorded Investment 4,551 896 4,233 755  
Interest Income Recognized 13   81    
Consumer | With No Related Allowance Recorded          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 2,939   2,939   2,559
Recorded Investment 2,478   2,478   2,246
Average Recorded Investment 2,495 2,340 2,368 2,220  
Interest Income Recognized 36 44 106 105  
Consumer | With an Allowance Recorded          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 0   0   581
Recorded Investment 0   0   310
Allowance for Loan Losses Allocated 0   0   125
Average Recorded Investment 0 0 148 0  
Interest Income Recognized 0   6 0  
Commercial and Industrial | With No Related Allowance Recorded          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 925   925   300
Recorded Investment 893   893   268
Average Recorded Investment 908 269 588 270  
Interest Income Recognized $ 26 0 $ 50 0  
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   $ 0