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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 1,716,660 | $ 1,745,340
Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 795,701 | 802,792
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 264,899 | 268,281
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 324,824 | 326,399
Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 7,011 | 5,018
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 19,961 | 18,183
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 179,006 | 184,911
Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 560,318 | 579,367
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 421,422 | 414,924
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 19,020 | 19,751
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 119,876 | 144,692
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 360,641 | 363,181
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 56,767 | 54,341
Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 140 | 153
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 147,574 | 151,523
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 156,160 | 157,164
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 1,682,315 | $ 1,713,981
Percentage of total loans | 98.00% | 98.20%
Pass [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 770,566 | $ 781,108
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 253,513 | 257,181
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 317,121 | 320,216
Pass [Member] | Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 7,011 | 5,018
Pass [Member] | Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 19,961 | 18,112
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 172,960 | 180,581
Pass [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 554,344 | 573,130
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 415,694 | 408,937
Pass [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 18,774 | 19,501
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 119,876 | 144,692
Pass [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 357,405 | 359,743
Pass [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 56,271 | 53,800
Pass [Member] | Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 140 | 153
Pass [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 146,835 | 150,895
Pass [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 154,159 | 154,895
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 10,824 | $ 6,232
Percentage of total loans | 0.63% | 0.36%
Special Mention [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 10,824 | $ 6,232
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 6,118 | 4,954
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,709 | 585
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,997 | 693
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 23,521 | $ 25,127
Percentage of total loans | 1.37% | 1.44%
Substandard [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 14,311 | $ 15,452
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,268 | 6,146
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 4,994 | 5,598
Substandard [Member] | Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total |  | 71
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 4,049 | 3,637
Substandard [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,974 | 6,237
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,728 | 5,987
Substandard [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 246 | 250
Substandard [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 3,236 | 3,438
Substandard [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 496 | 541
Substandard [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 739 | 628
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,001 | $ 2,269
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Percentage of total loans | 0.00% | 0.00%

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