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Loans and Allowance for Loan and Lease Losses - Additional Information with Respect to Impaired Loans, by Portfolio Type (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]          
Recorded Investment $ 26,503   $ 26,503   $ 25,857
Unpaid Principal Balance 36,138   36,138   28,549
Related Allowance 485   485   484
Average Balance 30,995 $ 31,192 29,282 $ 32,507  
Interest Income Recognized 65 353 269 461  
Commercial loans          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 14,908   14,908   12,431
Unpaid Principal Balance 23,520   23,520   14,137
Related Allowance 0   0   0
Average Balance 18,668 15,590 16,588 17,432  
Interest Income Recognized 51 31 247 105  
Consumer loans          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 304   304   0
Unpaid Principal Balance 304   304   0
Related Allowance 0   0   0
Average Balance 433 0 288 0  
Interest Income Recognized 11 0 19 0  
Commercial real estate | Owner occupied          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 3,939   3,939   3,992
Unpaid Principal Balance 4,445   4,445   4,387
Related Allowance 485   485   484
Average Balance 3,844 3,492 3,894 3,051  
Interest Income Recognized 3 81 3 81  
Commercial real estate | All other          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 5,778   5,778   6,668
Unpaid Principal Balance 6,061   6,061   6,806
Related Allowance 0   0   0
Average Balance 5,977 5,812 6,208 5,663  
Interest Income Recognized 0 201 0 201  
Residential mortgage loans | Multi-family          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 434   434   447
Unpaid Principal Balance 446   446   450
Related Allowance 0   0   0
Average Balance 438 454 441 303  
Interest Income Recognized 0 4 0 9  
Residential mortgage loans | Single family          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 0   0   701
Unpaid Principal Balance 0   0   1,037
Related Allowance 0   0   0
Average Balance 267 4,143 412 4,220  
Interest Income Recognized 0 29 0 58  
Land development loans          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 1,140   1,140   1,618
Unpaid Principal Balance 1,362   1,362   1,732
Related Allowance 0   0   0
Average Balance 1,368 1,701 1,451 1,838  
Interest Income Recognized 0 7 0 7  
Loans with no allowance recorded          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 24,914   24,914   24,236
Unpaid Principal Balance 34,266   34,266   26,677
Related Allowance 0   0   0
Average Balance 23,120 30,135 23,492 30,951  
Interest Income Recognized 65 347 269 455  
Loans with no allowance recorded | Commercial loans          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 14,908   14,908   12,431
Unpaid Principal Balance 23,520   23,520   14,137
Related Allowance 0   0   0
Average Balance 12,388 14,533 12,402 15,876  
Interest Income Recognized 51 25 247 99  
Loans with no allowance recorded | Consumer loans          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 304   304   0
Unpaid Principal Balance 304   304   0
Related Allowance 0   0   0
Average Balance 433 0 288 0  
Interest Income Recognized 11 0 19 0  
Loans with no allowance recorded | Commercial real estate | Owner occupied          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 2,350   2,350   2,371
Unpaid Principal Balance 2,573   2,573   2,515
Related Allowance 0   0   0
Average Balance 2,249 3,492 2,290 3,051  
Interest Income Recognized 3 81 3 81  
Loans with no allowance recorded | Commercial real estate | All other          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 5,778   5,778   6,668
Unpaid Principal Balance 6,061   6,061   6,806
Related Allowance 0   0   0
Average Balance 5,977 5,812 6,208 5,663  
Interest Income Recognized 0 201 0 201  
Loans with no allowance recorded | Residential mortgage loans | Multi-family          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 434   434   447
Unpaid Principal Balance 446   446   450
Related Allowance 0   0   0
Average Balance 438 454 441 303  
Interest Income Recognized 0 4 0 9  
Loans with no allowance recorded | Residential mortgage loans | Single family          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 0   0   701
Unpaid Principal Balance 0   0   1,037
Related Allowance 0   0   0
Average Balance 267 4,143 412 4,220  
Interest Income Recognized 0 29 0 58  
Loans with no allowance recorded | Land development loans          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 1,140   1,140   1,618
Unpaid Principal Balance 1,362   1,362   1,732
Related Allowance 0   0   0
Average Balance 1,368 1,701 1,451 1,838  
Interest Income Recognized 0 7 0 7  
Loans with allowance recorded          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 1,589   1,589   1,621
Unpaid Principal Balance 1,872   1,872   1,872
Related Allowance 485   485   484
Average Balance 7,875 1,057 5,790 1,556  
Interest Income Recognized 0 6 0 6  
Loans with allowance recorded | Commercial loans          
Financing Receivable, Impaired [Line Items]          
Average Balance 6,280 1,057 4,186 1,556  
Interest Income Recognized 0 6 0 6  
Loans with allowance recorded | Commercial real estate | Owner occupied          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 1,589   1,589   1,621
Unpaid Principal Balance 1,872   1,872   1,872
Related Allowance 485   485   $ 484
Average Balance 1,595 0 1,604 0  
Interest Income Recognized $ 0 $ 0 $ 0 $ 0