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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		Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		$ 84,542		$ 78,934
Individually evaluated for impairment		5,529		3,964
Total allowance for loan losses		90,253	$ 87,194	83,575	$ 75,670	$ 70,204	$ 67,240
Collectively evaluated for impairment		18,718,198		17,599,074
Individually evaluated for impairment		76,315		83,146
Loans		18,814,318		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		19,805		25,329
Commercial real estate - mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		30,048		26,222
Individually evaluated for impairment		778		724
Total allowance for loan losses		30,826	30,167	26,946	24,848	22,688	21,188
Collectively evaluated for impairment		7,553,915		7,124,117
Individually evaluated for impairment		22,971		28,838
Loans		7,585,393		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		8,507		11,999
Consumer real estate - mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		6,341		6,227
Individually evaluated for impairment		2,148		1,443
Total allowance for loan losses		8,489	8,369	7,670	5,853	5,100	5,031
Collectively evaluated for impairment		2,911,298		2,808,142
Individually evaluated for impairment		30,655		27,111
Loans		2,949,755		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		7,802		9,194
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		11,163		11,100
Individually evaluated for impairment		43		28
Total allowance for loan losses		11,206	10,915	11,128	10,984	10,116	8,962
Collectively evaluated for impairment		2,114,132		2,066,613
Individually evaluated for impairment		626		2,367
Loans		2,117,969		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		3,211		3,475
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		34,876		30,290
Individually evaluated for impairment		2,560		1,441
Total allowance for loan losses		37,436	32,699	31,731	28,338	26,648	24,863
Collectively evaluated for impairment		5,772,870		5,246,913
Individually evaluated for impairment		21,952		23,847
Loans		5,795,107		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		285		661
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment		2,114		5,095
Individually evaluated for impairment		0		328
Total allowance for loan losses		2,114	4,803	5,423	5,172	5,476	5,874
Collectively evaluated for impairment		365,983		353,289
Individually evaluated for impairment		111		983
Loans		366,094		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		182	$ 241	677	$ 475	$ 176	$ 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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