Allowance for Loan Losses - Schedule of Loan Portfolio, Excluding PCI Loans and Related Allowance (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Recorded Investment
Individually Evaluated for Impairment	$ 34,688	$ 36,700
Collectively Evaluated for Impairment	4,839,870	4,774,080
Total	4,874,558	4,810,780
Associated Allowance
Individually Evaluated for Impairment	2,198	2,728
Collectively Evaluated for Impairment	31,307	29,695
Total	33,505	32,423
PCI Loans
Recorded Investment
Individually Evaluated for Impairment	13,581	14,434
Associated Allowance
Individually Evaluated for Impairment	0	0
Construction and land development
Recorded Investment
Individually Evaluated for Impairment	757	211
Collectively Evaluated for Impairment	379,079	443,206
Total	379,836	443,417
Associated Allowance
Individually Evaluated for Impairment	19	22
Collectively Evaluated for Impairment	2,224	2,211
Total	2,243	2,233
Construction and land development \| PCI Loans
Recorded Investment
Individually Evaluated for Impairment	155	151
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial real estate
Recorded Investment
Individually Evaluated for Impairment	15,242	13,638
Collectively Evaluated for Impairment	2,164,719	2,107,600
Total	2,179,961	2,121,238
Associated Allowance
Individually Evaluated for Impairment	338	369
Collectively Evaluated for Impairment	11,532	10,743
Total	11,870	11,112
Commercial real estate \| PCI Loans
Recorded Investment
Individually Evaluated for Impairment	10,324	10,828
Associated Allowance
Individually Evaluated for Impairment	0	0
Residential real estate
Recorded Investment
Individually Evaluated for Impairment	15,275	19,047
Collectively Evaluated for Impairment	1,382,441	1,302,612
Total	1,397,716	1,321,659
Associated Allowance
Individually Evaluated for Impairment	543	805
Collectively Evaluated for Impairment	6,965	6,970
Total	7,508	7,775
Residential real estate \| PCI Loans
Recorded Investment
Individually Evaluated for Impairment	2,468	2,718
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial and financial
Recorded Investment
Individually Evaluated for Impairment	2,973	3,322
Collectively Evaluated for Impairment	698,140	718,263
Total	701,113	721,585
Associated Allowance
Individually Evaluated for Impairment	1,179	1,498
Collectively Evaluated for Impairment	7,733	7,087
Total	8,912	8,585
Commercial and financial \| PCI Loans
Recorded Investment
Individually Evaluated for Impairment	634	737
Associated Allowance
Individually Evaluated for Impairment	0	0
Consumer
Recorded Investment
Individually Evaluated for Impairment	441	482
Collectively Evaluated for Impairment	215,491	202,399
Total	215,932	202,881
Associated Allowance
Individually Evaluated for Impairment	119	34
Collectively Evaluated for Impairment	2,853	2,684
Total	2,972	2,718
Consumer \| PCI Loans
Recorded Investment
Individually Evaluated for Impairment	0	0
Associated Allowance
Individually Evaluated for Impairment	$ 0	$ 0

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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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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