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Loans and Allowance for Loan Losses, Financing Receivables Past Due (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 15,633,116,029	$ 8,449,924,736	$ 6,543,235,000
Nonaccrual	41,519,000	18,740,000
Currently performing impaired loans	45,800,000	16,700,000
Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	26,719,000	0
Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	60,158,000	22,330,000
30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	56,019,000	21,196,000
90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,139,000	1,134,000
Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	15,488,784,000	8,400,018,000
Total Loans	15,633,116,000	8,449,925,000
Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	15,936,000	8,837,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,669,610,000	3,193,496,000	2,275,483,000
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	11,395,000	2,297,000
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,820,000	0
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,876,000	3,505,000
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,772,000	3,505,000
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	104,000	0
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,435,819,000	1,347,134,000
Total Loans	2,460,015,000	1,354,893,000
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,105,000	1,957,000
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	704,000	239,000
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,018,000	0
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	16,559,000	0
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	16,559,000	0
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,177,454,000	1,837,936,000
Total Loans	4,209,595,000	1,838,603,000
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,860,000	428,000
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,561,214,000	1,185,917,000	1,046,517,000
Nonaccrual	9,320,000	5,553,000
Residential Mortgage [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,249,000	0
Residential Mortgage [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	16,100,000	3,891,000
Residential Mortgage [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	14,835,000	3,838,000
Residential Mortgage [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,265,000	53,000
Residential Mortgage [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,521,748,000	1,173,953,000
Total Loans	2,561,214,000	1,185,917,000
Residential Mortgage [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	8,797,000	2,520,000
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,908,288,000	912,673,000	747,697,000
Nonaccrual	2,878,000	3,205,000
Construction and Land Development [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,478,000	0
Construction and Land Development [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,282,000	2,210,000
Construction and Land Development [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,136,000	2,210,000
Construction and Land Development [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	146,000	0
Construction and Land Development [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,894,560,000	903,850,000
Total Loans	1,908,288,000	912,673,000
Construction and Land Development [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3,090,000	3,408,000
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,141,341,000	2,891,710,000	2,228,542,000
Nonaccrual	17,222,000	6,971,000
Commercial and Industrial [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,154,000	0
Commercial and Industrial [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	8,754,000	4,475,000
Commercial and Industrial [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	7,406,000	4,475,000
Commercial and Industrial [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,348,000	0
Commercial and Industrial [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,114,127,000	2,879,740,000
Total Loans	4,141,341,000	2,891,710,000
Commercial and Industrial [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	84,000	524,000
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	352,663,000	266,129,000	$ 244,996,000
Nonaccrual	0	475,000
Consumer and Other [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Consumer and Other [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	7,587,000	8,249,000
Consumer and Other [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,311,000	7,168,000
Consumer and Other [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,276,000	1,081,000
Consumer and Other [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	345,076,000	257,405,000
Total Loans	352,663,000	266,129,000
Consumer and Other [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 0	$ 0

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=65880944

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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+ References

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-Topic 310
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