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Loans and Allowance for Loan Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification and Impairment Evaluation Method (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		$ 87,532		$ 78,934
Individually evaluated for impairment		3,608		3,964
Total allowance for loan losses		93,647	$ 90,253	83,575	$ 79,985	$ 75,670	$ 67,240
Collectively evaluated for impairment		19,253,788		17,599,074
Individually evaluated for impairment		70,982		83,146
Loans		19,345,642		17,707,549
Loans acquired with deteriorated credit quality(1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowance for loan losses	[1]	0		0
Loans acquired with deteriorated credit quality		20,872		25,329
Commercial real estate - mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		31,596		26,222
Individually evaluated for impairment		1,021		724
Total allowance for loan losses		32,617	30,826	26,946	26,517	24,848	21,188
Collectively evaluated for impairment		7,678,415		7,124,117
Individually evaluated for impairment		21,818		28,838
Loans		7,709,245		7,164,954
Commercial real estate - mortgage | Loans acquired with deteriorated credit quality(1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowance for loan losses	[1]	0		0
Loans acquired with deteriorated credit quality		9,012		11,999
Consumer real estate - mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		6,705		6,227
Individually evaluated for impairment		1,065		1,443
Total allowance for loan losses		7,770	8,489	7,670	6,727	5,853	5,031
Collectively evaluated for impairment		2,994,237		2,808,142
Individually evaluated for impairment		24,205		27,111
Loans		3,025,502		2,844,447
Consumer real estate - mortgage | Loans acquired with deteriorated credit quality(1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowance for loan losses	[1]	0		0
Loans acquired with deteriorated credit quality		7,060		9,194
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		11,859		11,100
Individually evaluated for impairment		15		28
Total allowance for loan losses		11,874	11,206	11,128	10,982	10,984	8,962
Collectively evaluated for impairment		2,249,962		2,066,613
Individually evaluated for impairment		295		2,367
Loans		2,253,303		2,072,455
Construction and land development | Loans acquired with deteriorated credit quality(1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowance for loan losses	[1]	0		0
Loans acquired with deteriorated credit quality		3,046		3,475
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		33,078		30,290
Individually evaluated for impairment		1,497		1,441
Total allowance for loan losses		34,575	37,436	31,731	30,124	28,338	24,863
Collectively evaluated for impairment		5,864,796		5,246,913
Individually evaluated for impairment		24,488		23,847
Loans		5,891,038		5,271,421
Commercial and industrial | Loans acquired with deteriorated credit quality(1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowance for loan losses	[1]	0		0
Loans acquired with deteriorated credit quality		1,754		661
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		4,294		5,095
Individually evaluated for impairment		10		328
Total allowance for loan losses		4,304	2,114	5,423	4,813	5,172	5,874
Collectively evaluated for impairment		466,378		353,289
Individually evaluated for impairment		176		983
Loans		466,554		354,272
Consumer and other | Loans acquired with deteriorated credit quality(1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowance for loan losses	[1]	0		0
Loans acquired with deteriorated credit quality		0		0
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment
Individually evaluated for impairment
Total allowance for loan losses		2,507	$ 182	677	$ 822	$ 475	$ 1,322
Unallocated | Loans acquired with deteriorated credit quality(1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowance for loan losses	[1]
[1] Loans acquired with deteriorated credit quality are recorded at fair value at the time of acquisition. An allowance for loan losses is recorded only in the event of subsequent credit deterioration.

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