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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,961,481	$ 2,838,288
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,702,839	1,675,389
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	583,261	575,816
Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	704,284	683,901
Commercial [Member] | Residential Spec Homes [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,254	16,591
Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	43,889	49,996
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	364,151	349,085
Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	724,771	703,643
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	630,955	593,108
Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	22,394	16,027
Real Estate [Member] | Mortgage Warehousing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	71,422	94,508
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	533,871	459,256
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	37,895	36,737
Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	303,579	227,659
Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	192,397	194,860
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,907,992	$ 2,771,306
Percentage of total loans	98.19%	97.64%
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,655,379	$ 1,617,467
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	563,429	548,992
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	692,995	675,030
Pass [Member] | Commercial [Member] | Residential Spec Homes [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,254	16,591
Pass [Member] | Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	41,084	48,884
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	350,617	327,970
Pass [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	721,159	697,927
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	627,343	587,614
Pass [Member] | Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	22,394	15,805
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	71,422	94,508
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	531,454	455,912
Pass [Member] | Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	37,833	36,577
Pass [Member] | Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	302,911	226,451
Pass [Member] | Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	190,710	192,884
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 18,834	$ 20,820
Percentage of total loans	0.64%	0.73%
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 18,834	$ 20,820
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,176	8,622
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,903	3,864
Special Mention [Member] | Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,734	886
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,021	7,448
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 34,655	$ 46,162
Percentage of total loans	1.17%	1.63%
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 28,626	$ 37,102
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	14,656	18,202
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,386	5,007
Substandard [Member] | Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	71	226
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	8,513	13,667
Substandard [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,612	5,716
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,612	5,494
Substandard [Member] | Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		222
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,417	3,344
Substandard [Member] | Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	62	160
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	668	1,208
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,687	$ 1,976
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	0.00%	0.00%

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Percentage of notes receivable gross.

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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