Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)	12 Months Ended
Dec. 31, 2018 USD ($) contract	Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract	Dec. 31, 2015 USD ($)
Financing Receivable, Modifications [Line Items]
Loans	$ 17,707,549,000	$ 15,633,116,000	$ 8,449,925,000
Financing Receivable, Allowance for Credit Losses	$ 83,575,000	$ 67,240,000	$ 58,980,000	$ 65,432,000
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	4	3	6
Pre Modification Outstanding Recorded Investment	$ 2,314,000	$ 3,782,000	$ 11,084,000
Post Modification Outstanding Recorded Investment net of related allowance	$ 2,314,000	$ 3,756,000	$ 11,083,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Loans	7,164,954,000	6,669,610,000	3,193,496,000
Financing Receivable, Allowance for Credit Losses	$ 26,946,000	$ 21,188,000	$ 13,655,000	15,513,000
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	0	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post Modification Outstanding Recorded Investment net of related allowance	0	0	0
Consumer Real Estate
Financing Receivable, Modifications [Line Items]
Loans	2,844,447,000	2,561,214,000	1,185,917,000
Financing Receivable, Allowance for Credit Losses	$ 7,670,000	$ 5,031,000	$ 6,564,000	7,220,000
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	3	1	0
Pre Modification Outstanding Recorded Investment	$ 1,967,000	$ 6,000	$ 0
Post Modification Outstanding Recorded Investment net of related allowance	1,967,000	5,000	0
Construction and Land Development
Financing Receivable, Modifications [Line Items]
Loans	2,072,455,000	1,908,288,000	912,673,000
Financing Receivable, Allowance for Credit Losses	$ 11,128,000	$ 8,962,000	$ 3,624,000	2,903,000
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	1	0	0
Pre Modification Outstanding Recorded Investment	$ 347,000	$ 0	$ 0
Post Modification Outstanding Recorded Investment net of related allowance	347,000	0	0
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Loans	5,271,421,000	4,141,341,000	2,891,710,000
Financing Receivable, Allowance for Credit Losses	$ 31,731,000	$ 24,863,000	$ 24,743,000	23,643,000
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	0	2	6
Pre Modification Outstanding Recorded Investment	$ 0	$ 3,776,000	$ 11,084,000
Post Modification Outstanding Recorded Investment net of related allowance	0	3,751,000	11,083,000
Consumer and Other
Financing Receivable, Modifications [Line Items]
Loans	354,272,000	352,663,000	266,129,000
Financing Receivable, Allowance for Credit Losses	$ 5,423,000	$ 5,874,000	$ 9,520,000	$ 15,616,000
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	0	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post Modification Outstanding Recorded Investment net of related allowance	0	0	0
Troubled Debt Restructurings
Financing Receivable, Modifications [Line Items]
Loans	$ 5,900,000	$ 6,600,000
Financing Receivable, Allowance for Credit Losses			$ 21,000

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A valuation allowance for financing receivables that are expected to be uncollectible.

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-Topic 310
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Number of financing receivables that have been modified by troubled debt restructurings.

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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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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