Subordinated Debt and Other borrowings - Narrative (Details)	6 Months Ended
Jun. 30, 2017 USD ($) subsidiary	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Number of wholly owned subsidiaries \| subsidiary	12
Term	30 years
Subordinated debt and other borrowings	$ 465,419,408	$ 350,768,050
BNC Bancorp \| BNC Subordinated Notes Assumed Due October 2024
Debt Instrument [Line Items]
Subordinated debt and other borrowings	$ 60,000,000
Issuance date	Sep. 01, 2014
Maturity date	Oct. 31, 2024
Interest rate (as percent)	5.50%
BNC Bancorp \| BNC Subordinated Notes Assumed Due October 2024 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, term of variable rate	3 months
Variable rate basis description	Libor + 3.59
Debt instrument, basis spread on variable rate (as percent)	3.59%
BNC Bancorp \| BNC Subordinated Notes Assumed Due October 2023
Debt Instrument [Line Items]
Subordinated debt and other borrowings		$ 10,600,000
Maturity date	Oct. 15, 2023
Interest rate (as percent)		5.61%
Loan face amount	$ 50,500,000
BNC Bancorp \| BNC Subordinated Notes Assumed Due October 2023 \| Minimum
Debt Instrument [Line Items]
Interest rate (as percent)	5.50%
BNC Bancorp \| BNC Subordinated Notes Assumed Due October 2023 \| Maximum
Debt Instrument [Line Items]
Interest rate (as percent)	9.50%
BNC Bancorp \| BNC Subordinated Notes Assumed Due October 2023 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, term of variable rate	30 days
Variable rate basis description	Libor + 5.00%
Debt instrument, basis spread on variable rate (as percent)	5.00%

Term of the interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index.

No definition available.

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- Definition

Number of wholly owned subsidiaries.

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Topic 835
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-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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