Impaired Loans and Allowance for Loan Losses - Loan Portfolio and Related Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Carrying Value
Individually Evaluated for Impairment	$ 32,727	$ 43,577
Collectively Evaluated for Impairment	2,111,494	1,770,494
Total	2,144,221	1,814,071
Associated Allowance
Individually Evaluated for Impairment	2,517	3,541
Collectively Evaluated for Impairment	16,611	13,466
Total	19,128	17,007
PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	12,109	7,814
Associated Allowance
Individually Evaluated for Impairment	0	64
Construction and Land Development [Member]
Carrying Value
Individually Evaluated for Impairment	942	2,710
Collectively Evaluated for Impairment	107,731	82,769
Total	108,673	85,479
Associated Allowance
Individually Evaluated for Impairment	84	159
Collectively Evaluated for Impairment	1,067	563
Total	1,151	722
Construction and Land Development [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	114	1,557
Associated Allowance
Individually Evaluated for Impairment	0	43
Commercial Real Estate [Member]
Carrying Value
Individually Evaluated for Impairment	9,450	11,446
Collectively Evaluated for Impairment	989,938	821,609
Total	999,388	833,055
Associated Allowance
Individually Evaluated for Impairment	429	529
Collectively Evaluated for Impairment	6,327	3,999
Total	6,756	4,528
Commercial Real Estate [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	9,990	4,092
Associated Allowance
Individually Evaluated for Impairment	0	3
Residential Real Estate [Member]
Carrying Value
Individually Evaluated for Impairment	21,703	28,702
Collectively Evaluated for Impairment	701,160	657,344
Total	722,863	686,046
Associated Allowance
Individually Evaluated for Impairment	1,964	2,741
Collectively Evaluated for Impairment	6,093	7,043
Total	8,057	9,784
Residential Real Estate [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	922	851
Associated Allowance
Individually Evaluated for Impairment	0	18
Commercial And Financial [Member]
Carrying Value
Individually Evaluated for Impairment	17	120
Collectively Evaluated for Impairment	227,417	155,964
Total	227,434	156,084
Associated Allowance
Individually Evaluated for Impairment	0	0
Collectively Evaluated for Impairment	2,042	1,179
Total	2,042	1,179
Commercial And Financial [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	1,083	1,312
Associated Allowance
Individually Evaluated for Impairment	0	0
Consumer [Member]
Carrying Value
Individually Evaluated for Impairment	615	599
Collectively Evaluated for Impairment	85,248	52,808
Total	85,863	53,407
Associated Allowance
Individually Evaluated for Impairment	40	112
Collectively Evaluated for Impairment	1,082	682
Total	1,122	794
Consumer [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	0	2
Associated Allowance
Individually Evaluated for Impairment	$ 0	$ 0

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

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)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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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=49124121&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
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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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
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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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=49124121&loc=SL6953423-111524

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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.

+ 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=28367877&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

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