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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

X
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