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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 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 |  |  | 4,229 | 3,843
Provision for loan commitments |  |  | 1,025 | 33
Total provision for credit losses | $ 2,747 | $ 1,708 | 5,254 | 3,876
Charge-offs |  |  | (4,866) | (4,959)
Recoveries |  |  | 2,548 | 3,470
Net charge-offs |  |  | (2,318) | (1,489)
Allowance for loan losses, ending balance | 50,859 | 47,638 | 50,859 | 47,638
Allowance for loan commitments, ending balance | 1,766 | 607 | 1,766 | 607
Total ending allowance for credit losses | 52,625 | 48,245 | 52,625 | 48,245
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 |  |  | (538) | 1,465
Provision for loan commitments |  |  | 18 | 44
Total provision for credit losses |  |  | (520) | 1,509
Charge-offs |  |  |  | (136)
Recoveries |  |  | 200 | 264
Net charge-offs |  |  | 200 | 128
Allowance for loan losses, ending balance | 3,701 | 4,710 | 3,701 | 4,710
Allowance for loan commitments, ending balance | 187 | 163 | 187 | 163
Total ending allowance for credit losses | 3,888 | 4,873 | 3,888 | 4,873
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 |  |  | 1,459 | (1,774)
Provision for loan commitments |  |  | (9) | (8)
Total provision for credit losses |  |  | 1,450 | (1,782)
Charge-offs |  |  | (285) | (692)
Recoveries |  |  | 345 | 776
Net charge-offs |  |  | 60 | 84
Allowance for loan losses, ending balance | 22,367 | 19,476 | 22,367 | 19,476
Allowance for loan commitments, ending balance | 24 | 18 | 24 | 18
Total ending allowance for credit losses | 22,391 | 19,494 | 22,391 | 19,494
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 |  |  | 1,309 | 2,100
Provision for loan commitments |  |  | 995 | 2
Total provision for credit losses |  |  | 2,304 | 2,102
Charge-offs |  |  | (1,025) | (616)
Recoveries |  |  | 489 | 636
Net charge-offs |  |  | (536) | 20
Allowance for loan losses, ending balance | 12,887 | 11,534 | 12,887 | 11,534
Allowance for loan commitments, ending balance | 1,257 | 175 | 1,257 | 175
Total ending allowance for credit losses | 14,144 | 11,709 | 14,144 | 11,709
Deposit Overdraft [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 |  |  | 1,119 | 439
Total provision for credit losses |  |  | 1,119 | 439
Charge-offs |  |  | (860) | (541)
Recoveries |  |  | 215 | 197
Net charge-offs |  |  | (645) | (344)
Allowance for loan losses, ending balance | 1,446 | 916 | 1,446 | 916
Total ending allowance for credit losses | 1,446 | 916 | 1,446 | 916
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 |  |  | 124 | 944
Provision for loan commitments |  |  | 1 | 2
Total provision for credit losses |  |  | 125 | 946
Charge-offs |  |  | (679) | (509)
Recoveries |  |  | 188 | 252
Net charge-offs |  |  | (491) | (257)
Allowance for loan losses, ending balance | 3,455 | 3,893 | 3,455 | 3,893
Allowance for loan commitments, ending balance | 13 | 9 | 13 | 9
Total ending allowance for credit losses | 3,468 | 3,902 | 3,468 | 3,902
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 |  |  | 333 | 615
Provision for loan commitments |  |  | (3) |
Total provision for credit losses |  |  | 330 | 615
Charge-offs |  |  | (1,344) | (1,793)
Recoveries |  |  | 896 | 1,066
Net charge-offs |  |  | (448) | (727)
Allowance for loan losses, ending balance | 2,682 | 2,951 | 2,682 | 2,951
Allowance for loan commitments, ending balance | 36 | 37 | 36 | 37
Total ending allowance for credit losses | 2,718 | 2,988 | 2,718 | 2,988
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 |  |  | 423 | 54
Provision for loan commitments |  |  | 23 | (7)
Total provision for credit losses |  |  | 446 | 47
Charge-offs |  |  | (673) | (672)
Recoveries |  |  | 215 | 279
Net charge-offs |  |  | (458) | (393)
Allowance for loan losses, ending balance | 4,321 | 4,158 | 4,321 | 4,158
Allowance for loan commitments, ending balance | 249 | 205 | 249 | 205
Total ending allowance for credit losses | $ 4,570 | $ 4,363 | $ 4,570 | $ 4,363

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