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Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | $ 1,501 |  |  |
Allowance for loans collectively evaluated for impairment | 52,816 | $ 48,948 |  |
Allowance for loan commitments | 1,639 | 741 | $ 684 | $ 574
Total allowance for credit losses | 55,956 | 49,689 | 49,586 | 45,858
Individually evaluated for impairment | 11,042 |  |  |
Collectively evaluated for impairment | 7,735,160 | 7,646,540 |  |
Acquired with deteriorated credit quality | 10,550 | 9,741 |  |
Total loans | 7,756,752 | 7,656,281 |  |
Commercial Real Estate - Land and Construction [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 4,042 | 4,039 |  |
Allowance for loan commitments | 195 | 169 | 186 | 119
Total allowance for credit losses | 4,237 | 4,208 | 4,355 | 3,236
Collectively evaluated for impairment | 510,162 | 527,737 |  |
Acquired with deteriorated credit quality | 242 | 335 |  |
Total loans | 510,404 | 528,072 |  |
Commercial Real Estate - Improved Property [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 1,471 |  |  |
Allowance for loans collectively evaluated for impairment | 22,422 | 20,848 |  |
Allowance for loan commitments | 24 | 33 | 23 | 26
Total allowance for credit losses | 23,917 | 20,881 | 20,847 | 21,192
Individually evaluated for impairment | 5,388 |  |  |
Collectively evaluated for impairment | 3,330,959 | 3,319,672 |  |
Acquired with deteriorated credit quality | 7,902 | 5,951 |  |
Total loans | 3,344,249 | 3,325,623 |  |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 10 |  |  |
Allowance for loans collectively evaluated for impairment | 13,778 | 12,114 |  |
Allowance for loan commitments | 1,104 | 262 | 205 | 173
Total allowance for credit losses | 14,892 | 12,376 | 12,256 | 9,587
Individually evaluated for impairment | 185 |  |  |
Collectively evaluated for impairment | 1,331,248 | 1,264,560 |  |
Acquired with deteriorated credit quality | 842 | 900 |  |
Total loans | 1,332,275 | 1,265,460 |  |
Deposit Overdrafts [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 1,496 | 972 |  |
Total allowance for credit losses | 1,496 | 972 | 997 | 821
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 12 |  |  |
Allowance for loans collectively evaluated for impairment | 3,773 | 3,822 |  |
Allowance for loan commitments | 15 | 12 | 9 | 7
Total allowance for credit losses | 3,800 | 3,834 | 3,784 | 3,213
Individually evaluated for impairment | 4,662 |  |  |
Collectively evaluated for impairment | 1,632,348 | 1,609,177 |  |
Acquired with deteriorated credit quality | 1,564 | 2,430 |  |
Total loans | 1,638,574 | 1,611,607 |  |
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 1 |  |  |
Allowance for loans collectively evaluated for impairment | 2,747 | 2,797 |  |
Allowance for loan commitments | 38 | 39 | 40 | 37
Total allowance for credit losses | 2,786 | 2,836 | 2,836 | 3,100
Individually evaluated for impairment | 61 |  |  |
Collectively evaluated for impairment | 343,444 | 326,063 |  |
Acquired with deteriorated credit quality |  | 125 |  |
Total loans | 343,505 | 326,188 |  |
Home Equity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 7 |  |  |
Allowance for loans collectively evaluated for impairment | 4,558 | 4,356 |  |
Allowance for loan commitments | 263 | 226 | 221 | 212
Total allowance for credit losses | 4,828 | 4,582 | $ 4,511 | $ 4,709
Individually evaluated for impairment | 746 |  |  |
Collectively evaluated for impairment | 586,999 | 599,331 |  |
Total loans | $ 587,745 | $ 599,331 |  |

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 + Details
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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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