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Loans and Allowance for Loan Losses, Financing Receivables Past Due (Details) - USD ($)		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		$ 17,707,549,000	$ 15,633,116,000	$ 8,449,925,000
Nonaccrual loans	[1]	77,248,000	41,519,000
Total Loans		17,707,549,000	15,633,116,000
Currently performing impaired loans		52,500,000	45,800,000
Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		14,743,000	26,719,000
Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		10,586,000	15,936,000
Financing Receivables 30 To 89 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		58,301,000	56,019,000
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		1,558,000	4,139,000
Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		17,545,113,000	15,488,784,000
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		7,164,954,000	6,669,610,000	3,193,496,000
Commercial Real Estate | Commercial Real Estate Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	16,025,000	11,395,000
Total Loans		2,653,433,000	2,460,015,000
Commercial Real Estate | Commercial Real Estate Owner Occupied | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,664,000	4,820,000
Commercial Real Estate | Commercial Real Estate Owner Occupied | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		874,000	1,105,000
Commercial Real Estate | Commercial Real Estate Owner Occupied | Financing Receivables 30 To 89 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		10,170,000	6,772,000
Commercial Real Estate | Commercial Real Estate Owner Occupied | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		0	104,000
Commercial Real Estate | Commercial Real Estate Owner Occupied | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,623,700,000	2,435,819,000
Commercial Real Estate | Commercial Real Estate All Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	12,634,000	704,000
Total Loans		4,511,521,000	4,209,595,000
Commercial Real Estate | Commercial Real Estate All Other | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		5,659,000	12,018,000
Commercial Real Estate | Commercial Real Estate All Other | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		2,802,000	2,860,000
Commercial Real Estate | Commercial Real Estate All Other | Financing Receivables 30 To 89 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		1,586,000	16,559,000
Commercial Real Estate | Commercial Real Estate All Other | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		0	0
Commercial Real Estate | Commercial Real Estate All Other | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		4,488,840,000	4,177,454,000
Consumer Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,844,447,000	2,561,214,000	1,185,917,000
Nonaccrual loans	[1]	22,564,000	9,320,000
Total Loans		2,844,447,000	2,561,214,000
Consumer Real Estate | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		3,689,000	5,249,000
Consumer Real Estate | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		5,505,000	8,797,000
Consumer Real Estate | Financing Receivables 30 To 89 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		18,059,000	14,835,000
Consumer Real Estate | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		0	1,265,000
Consumer Real Estate | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,794,630,000	2,521,748,000
Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,072,455,000	1,908,288,000	912,673,000
Nonaccrual loans	[1]	2,020,000	2,878,000
Total Loans		2,072,455,000	1,908,288,000
Construction and Land Development | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,108,000	3,478,000
Construction and Land Development | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		1,367,000	3,090,000
Construction and Land Development | Financing Receivables 30 To 89 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		3,759,000	4,136,000
Construction and Land Development | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		0	146,000
Construction and Land Development | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,063,201,000	1,894,560,000
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		5,271,421,000	4,141,341,000	2,891,710,000
Nonaccrual loans	[1]	23,022,000	17,222,000
Total Loans		5,271,421,000	4,141,341,000
Commercial and Industrial | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		623,000	1,154,000
Commercial and Industrial | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		38,000	84,000
Commercial and Industrial | Financing Receivables 30 To 89 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		21,451,000	7,406,000
Commercial and Industrial | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		1,082,000	1,348,000
Commercial and Industrial | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		5,225,205,000	4,114,127,000
Consumer and Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		354,272,000	352,663,000	$ 266,129,000
Nonaccrual loans	[1]	983,000	0
Total Loans		354,272,000	352,663,000
Consumer and Other | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		0	0
Consumer and Other | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		0	0
Consumer and Other | Financing Receivables 30 To 89 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		3,276,000	6,311,000
Consumer and Other | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		476,000	1,276,000
Consumer and Other | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		$ 349,537,000	$ 345,076,000
[1] (1)Approximately $52.5 million and $45.8 million of nonaccrual loans as of December 31, 2018 and December 31, 2017, respectively, were performing pursuant to their contractual terms at those dates.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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