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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, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 38,372 $ 36,979
Allowance for Loan Losses Allocated 1,339 2,161
With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 35,951 27,482
Recorded Investment 35,177 26,487
Average Recorded Investment 32,060 30,093
Interest Income Recognized 1,178 1,152
With an Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,184 10,492
Recorded Investment 3,195 10,492
Allowance for Loan Losses Allocated 1,339 2,161
Average Recorded Investment 9,473 10,930
Interest Income Recognized 17 184
Residential Real Estate [Member] | With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 13,431 12,351
Recorded Investment 13,056 11,931
Average Recorded Investment 12,844 16,253
Interest Income Recognized 585 662
Residential Real Estate [Member] | With an Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 109 948
Recorded Investment 109 948
Allowance for Loan Losses Allocated 31 88
Average Recorded Investment 110 990
Interest Income Recognized 3 59
Commercial Real Estate [Member] | With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 19,240 12,174
Recorded Investment 19,154 12,142
Average Recorded Investment 16,328 11,472
Interest Income Recognized 462 384
Commercial Real Estate [Member] | With an Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,447 9,023
Recorded Investment 2,496 9,023
Allowance for Loan Losses Allocated 831 1,741
Average Recorded Investment 8,956 9,348
Interest Income Recognized 10 77
Consumer [Member] | With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,577 2,243
Recorded Investment 2,264 1,700
Average Recorded Investment 2,183 1,982
Interest Income Recognized 123 96
Consumer [Member] | With an Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 81 521
Recorded Investment 43 521
Allowance for Loan Losses Allocated 43 332
Average Recorded Investment 42 592
Interest Income Recognized 2 48
Commercial and Industrial [Member] | With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 703 714
Recorded Investment 703 714
Average Recorded Investment 705 386
Interest Income Recognized 8 $ 10
Commercial and Industrial [Member] | With an Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 547  
Recorded Investment 547  
Allowance for Loan Losses Allocated 434  
Average Recorded Investment 365  
Interest Income Recognized $ 2