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Non-performing Assets and Impaired Loans - Loans by Credit Grades (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 3,634,596 | $ 3,011,570
Percentage of total loans | 100.00% | 100.00%
Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,047,646 | $ 1,722,552
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 519,577 | 444,834
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 973,331 | 852,855
Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 12,925 | 5,195
Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 35,954 | 50,706
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 505,859 | 368,962
Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 920,998 | 742,244
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 751,019 | 644,094
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 19,686 | 24,030
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 150,293 | 74,120
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 665,952 | 546,774
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 41,079 | 35,103
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 348,658 | 314,177
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 276,215 | 197,494
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 3,541,122 | $ 2,949,743
Percentage of total loans | 97.43% | 97.95%
Pass [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 1,968,009 | $ 1,668,817
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 492,386 | 426,887
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 957,990 | 834,582
Pass [Member] | Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 12,925 | 5,195
Pass [Member] | Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 35,815 | 47,523
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 468,893 | 354,630
Pass [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 911,115 | 737,417
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 741,136 | 639,267
Pass [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 19,686 | 24,030
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 150,293 | 74,120
Pass [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 661,998 | 543,509
Pass [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 41,044 | 35,068
Pass [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 347,289 | 313,088
Pass [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 273,665 | 195,353
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 34,804 | $ 23,052
Percentage of total loans | 0.96% | 0.76%
Special Mention [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 34,804 | $ 23,052
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 8,328 | 3,664
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 7,824 | 9,682
Special Mention [Member] | Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 3,115
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 18,652 | 6,591
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 58,670 | $ 38,775
Percentage of total loans | 1.61% | 1.29%
Substandard [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 44,833 | $ 30,683
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 18,863 | 14,283
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 7,517 | 8,591
Substandard [Member] | Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 139 | 68
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 18,314 | 7,741
Substandard [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 9,883 | 4,827
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 9,883 | 4,827
Substandard [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total |  | 0
Substandard [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 3,954 | 3,265
Substandard [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 35 | 35
Substandard [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,369 | 1,089
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,550 | $ 2,141
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Percentage of total loans | 0.00% | 0.00%

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