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Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details) - USD ($)		Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		$ 17,464,009,000	$ 15,633,116,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	[1]	65,735,000	41,519,000
Currently performing impaired loans		54,600,000	45,800,000
Purchased credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		21,472,000	26,719,000
Purchased credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest		12,133,000	15,936,000
Past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		43,990,000	60,158,000
30-89 days past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		42,217,000	56,019,000
90 days or more past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		1,773,000	4,139,000
Current and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		17,320,679,000	15,488,784,000
Commercial real estate - mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		7,215,119,000	6,669,610,000
Commercial real estate - mortgage | Owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,688,245,000	2,460,015,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	[1]	19,738,000	11,395,000
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,769,000	4,820,000
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest		1,754,000	1,105,000
Commercial real estate - mortgage | Owner-occupied | Past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		7,756,000	6,876,000
Commercial real estate - mortgage | Owner-occupied | 30-89 days past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		7,756,000	6,772,000
Commercial real estate - mortgage | Owner-occupied | 90 days or more past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		0	104,000
Commercial real estate - mortgage | Owner-occupied | Current and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,656,228,000	2,435,819,000
Commercial real estate - mortgage | All other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		4,526,874,000	4,209,595,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	[1]	5,591,000	704,000
Commercial real estate - mortgage | All other | Purchased credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		11,382,000	12,018,000
Commercial real estate - mortgage | All other | Purchased credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest		2,883,000	2,860,000
Commercial real estate - mortgage | All other | Past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,633,000	16,559,000
Commercial real estate - mortgage | All other | 30-89 days past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,633,000	16,559,000
Commercial real estate - mortgage | All other | 90 days or more past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		0	0
Commercial real estate - mortgage | All other | Current and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		4,504,385,000	4,177,454,000
Consumer real estate - mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,815,160,000	2,561,214,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	[1]	19,165,000	9,320,000
Consumer real estate - mortgage | Purchased credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		3,735,000	5,249,000
Consumer real estate - mortgage | Purchased credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest		6,101,000	8,797,000
Consumer real estate - mortgage | Past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		13,358,000	16,100,000
Consumer real estate - mortgage | 30-89 days past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		13,358,000	14,835,000
Consumer real estate - mortgage | 90 days or more past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		0	1,265,000
Consumer real estate - mortgage | Current and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,772,801,000	2,521,748,000
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,059,009,000	1,908,288,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	[1]	2,024,000	2,878,000
Construction and land development | Purchased credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		2,778,000	3,478,000
Construction and land development | Purchased credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest		1,371,000	3,090,000
Construction and land development | Past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		3,368,000	4,282,000
Construction and land development | 30-89 days past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		3,368,000	4,136,000
Construction and land development | 90 days or more past due and 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		2,049,468,000	1,894,560,000
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		5,006,247,000	4,141,341,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	[1]	18,256,000	17,222,000
Commercial and industrial | Purchased credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		808,000	1,154,000
Commercial and industrial | Purchased credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest		24,000	84,000
Commercial and industrial | Past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		11,869,000	8,754,000
Commercial and industrial | 30-89 days past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		10,741,000	7,406,000
Commercial and industrial | 90 days or more past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		1,128,000	1,348,000
Commercial and industrial | Current and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		4,975,290,000	4,114,127,000
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		368,474,000	352,663,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	[1]	961,000	0
Consumer and other | Purchased credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		0	0
Consumer and other | Purchased credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest		0	0
Consumer and other | Past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		5,006,000	7,587,000
Consumer and other | 30-89 days past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		4,361,000	6,311,000
Consumer and other | 90 days or more past due and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		645,000	1,276,000
Consumer and other | Current and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		$ 362,507,000	$ 345,076,000
[1] Approximately $54.6 million and $45.8 million of nonaccrual loans as of September 30, 2018 and December 31, 2017, respectively, were performing pursuant to their contractual terms at those dates.

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 310
-SubTopic 10
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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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