Impaired Loans and Allowance for Loan Losses - Loan Portfolio and Related Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Recorded Investment
Individually Evaluated for Impairment	$ 32,718	$ 32,727
Collectively Evaluated for Impairment	2,833,822	2,111,494
Total	2,866,540	2,144,221
Associated Allowance
Individually Evaluated for Impairment	2,454	2,517
Collectively Evaluated for Impairment	20,946	16,611
Total	23,400	19,128
PCI Loans [Member]
Recorded Investment
Individually Evaluated for Impairment	12,996	12,109
Associated Allowance
Individually Evaluated for Impairment	0	0
Construction and Land Development [Member]
Recorded Investment
Individually Evaluated for Impairment	277	942
Collectively Evaluated for Impairment	159,839	107,731
Total	160,116	108,673
Associated Allowance
Individually Evaluated for Impairment	0	84
Collectively Evaluated for Impairment	1,219	1,067
Total	1,219	1,151
Construction and Land Development [Member] \| PCI Loans [Member]
Recorded Investment
Individually Evaluated for Impairment	114	114
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial Real Estate [Member]
Recorded Investment
Individually Evaluated for Impairment	10,204	9,450
Collectively Evaluated for Impairment	1,335,832	989,938
Total	1,346,036	999,388
Associated Allowance
Individually Evaluated for Impairment	395	429
Collectively Evaluated for Impairment	8,878	6,327
Total	9,273	6,756
Commercial Real Estate [Member] \| PCI Loans [Member]
Recorded Investment
Individually Evaluated for Impairment	11,257	9,990
Associated Allowance
Individually Evaluated for Impairment	0	0
Residential Real Estate [Member]
Recorded Investment
Individually Evaluated for Impairment	22,038	21,703
Collectively Evaluated for Impairment	814,250	701,160
Total	836,288	722,863
Associated Allowance
Individually Evaluated for Impairment	2,059	1,964
Collectively Evaluated for Impairment	5,424	6,093
Total	7,483	8,057
Residential Real Estate [Member] \| PCI Loans [Member]
Recorded Investment
Individually Evaluated for Impairment	684	922
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial And Financial [Member]
Recorded Investment
Individually Evaluated for Impairment	199	17
Collectively Evaluated for Impairment	369,449	227,417
Total	369,648	227,434
Associated Allowance
Individually Evaluated for Impairment	0	0
Collectively Evaluated for Impairment	3,636	2,042
Total	3,636	2,042
Commercial And Financial [Member] \| PCI Loans [Member]
Recorded Investment
Individually Evaluated for Impairment	941	1,083
Associated Allowance
Individually Evaluated for Impairment	0	0
Consumer [Member]
Recorded Investment
Individually Evaluated for Impairment	0	615
Collectively Evaluated for Impairment	154,452	85,248
Total	154,452	85,863
Associated Allowance
Individually Evaluated for Impairment	0	40
Collectively Evaluated for Impairment	1,789	1,082
Total	1,789	1,122
Consumer [Member] \| PCI Loans [Member]
Recorded Investment
Individually Evaluated for Impairment	0	0
Associated Allowance
Individually Evaluated for Impairment	$ 0	$ 0

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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-Publisher FASB
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