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Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, beginning balance     $ 48,948 $ 45,284
Allowance for loan commitments, beginning balance     741 574
Total beginning allowance for credit losses     49,689 45,858
Provision for loan losses     8,477 4,801
Provision for loan commitments     898 110
Total provision for credit losses $ 4,121 $ 1,035 9,375 4,911
Charge-offs     (6,868) (6,751)
Recoveries     3,760 5,568
Net charge-offs     (3,108) (1,183)
Allowance for loan losses, ending balance 54,317 48,902 54,317 48,902
Allowance for loan commitments, ending balance 1,639 684 1,639 684
Total ending allowance for credit losses 55,956 49,586 55,956 49,586
Commercial Real Estate - Land and Construction [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, beginning balance     4,039 3,117
Allowance for loan commitments, beginning balance     169 119
Total beginning allowance for credit losses     4,208 3,236
Provision for loan losses     (207) 789
Provision for loan commitments     26 67
Total provision for credit losses     (181) 856
Charge-offs     (45) (137)
Recoveries     255 400
Net charge-offs     210 263
Allowance for loan losses, ending balance 4,042 4,169 4,042 4,169
Allowance for loan commitments, ending balance 195 186 195 186
Total ending allowance for credit losses 4,237 4,355 4,237 4,355
Commercial Real Estate - Improved Property [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, beginning balance     20,848 21,166
Allowance for loan commitments, beginning balance     33 26
Total beginning allowance for credit losses     20,881 21,192
Provision for loan losses     2,939 (721)
Provision for loan commitments     (9) (3)
Total provision for credit losses     2,930 (724)
Charge-offs     (515) (719)
Recoveries     621 1,098
Net charge-offs     106 379
Allowance for loan losses, ending balance 23,893 20,824 23,893 20,824
Allowance for loan commitments, ending balance 24 23 24 23
Total ending allowance for credit losses 23,917 20,847 23,917 20,847
Commercial and Industrial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, beginning balance     12,114 9,414
Allowance for loan commitments, beginning balance     262 173
Total beginning allowance for credit losses     12,376 9,587
Provision for loan losses     2,549 2,538
Provision for loan commitments     842 32
Total provision for credit losses     3,391 2,570
Charge-offs     (1,420) (871)
Recoveries     545 970
Net charge-offs     (875) 99
Allowance for loan losses, ending balance 13,788 12,051 13,788 12,051
Allowance for loan commitments, ending balance 1,104 205 1,104 205
Total ending allowance for credit losses 14,892 12,256 14,892 12,256
Deposit Overdrafts [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, beginning balance     972 821
Total beginning allowance for credit losses     972 821
Provision for loan losses     1,503 840
Total provision for credit losses     1,503 840
Charge-offs     (1,273) (941)
Recoveries     294 277
Net charge-offs     (979) (664)
Allowance for loan losses, ending balance 1,496 997 1,496 997
Total ending allowance for credit losses 1,496 997 1,496 997
Residential Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, beginning balance     3,822 3,206
Allowance for loan commitments, beginning balance     12 7
Total beginning allowance for credit losses     3,834 3,213
Provision for loan losses     561 1,106
Provision for loan commitments     3 2
Total provision for credit losses     564 1,108
Charge-offs     (870) (873)
Recoveries     272 336
Net charge-offs     (598) (537)
Allowance for loan losses, ending balance 3,785 3,775 3,785 3,775
Allowance for loan commitments, ending balance 15 9 15 9
Total ending allowance for credit losses 3,800 3,784 3,800 3,784
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, beginning balance     2,797 3,063
Allowance for loan commitments, beginning balance     39 37
Total beginning allowance for credit losses     2,836 3,100
Provision for loan losses     405 541
Provision for loan commitments     (1) 3
Total provision for credit losses     404 544
Charge-offs     (1,886) (2,465)
Recoveries     1,432 1,657
Net charge-offs     (454) (808)
Allowance for loan losses, ending balance 2,748 2,796 2,748 2,796
Allowance for loan commitments, ending balance 38 40 38 40
Total ending allowance for credit losses 2,786 2,836 2,786 2,836
Home Equity [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, beginning balance     4,356 4,497
Allowance for loan commitments, beginning balance     226 212
Total beginning allowance for credit losses     4,582 4,709
Provision for loan losses     727 (292)
Provision for loan commitments     37 9
Total provision for credit losses     764 (283)
Charge-offs     (859) (745)
Recoveries     341 830
Net charge-offs     (518) 85
Allowance for loan losses, ending balance 4,565 4,290 4,565 4,290
Allowance for loan commitments, ending balance 263 221 263 221
Total ending allowance for credit losses $ 4,828 $ 4,511 $ 4,828 $ 4,511