Impaired Loans and Allowance for Loan Losses - Loan Portfolio and Related Allowance (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Carrying Value
Individually Evaluated for Impairment	$ 43,577	$ 52,969
Collectively Evaluated for Impairment	1,770,494	1,251,238
Total	1,814,071	1,304,207
Associated Allowance
Individually Evaluated for Impairment	3,541	5,446
Collectively Evaluated for Impairment	13,466	14,622
Total	17,007	20,068
PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	7,814
Associated Allowance
Individually Evaluated for Impairment	64
Construction and Land Development [Member]
Carrying Value
Individually Evaluated for Impairment	2,710	3,681
Collectively Evaluated for Impairment	82,769	63,769
Total	85,479	67,450
Associated Allowance
Individually Evaluated for Impairment	159	149
Collectively Evaluated for Impairment	563	659
Total	722	808
Construction and Land Development [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	1,557
Associated Allowance
Individually Evaluated for Impairment	43
Commercial Real Estate [Member]
Carrying Value
Individually Evaluated for Impairment	11,446	12,418
Collectively Evaluated for Impairment	821,609	507,964
Total	833,055	520,382
Associated Allowance
Individually Evaluated for Impairment	529	638
Collectively Evaluated for Impairment	3,999	5,522
Total	4,528	6,160
Commercial Real Estate [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	4,092
Associated Allowance
Individually Evaluated for Impairment	3
Residential Real Estate [Member]
Carrying Value
Individually Evaluated for Impairment	28,702	35,731
Collectively Evaluated for Impairment	657,344	557,015
Total	686,046	592,746
Associated Allowance
Individually Evaluated for Impairment	2,741	4,528
Collectively Evaluated for Impairment	7,043	7,131
Total	9,784	11,659
Residential Real Estate [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	851
Associated Allowance
Individually Evaluated for Impairment	18
Commercial And Financial [Member]
Carrying Value
Individually Evaluated for Impairment	120	166
Collectively Evaluated for Impairment	155,964	78,470
Total	156,084	78,636
Associated Allowance
Individually Evaluated for Impairment	0	13
Collectively Evaluated for Impairment	1,179	697
Total	1,179	710
Commercial And Financial [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	1,312
Associated Allowance
Individually Evaluated for Impairment	0
Consumer [Member]
Carrying Value
Individually Evaluated for Impairment	599	973
Collectively Evaluated for Impairment	52,808	44,020
Total	53,407	44,993
Associated Allowance
Individually Evaluated for Impairment	112	118
Collectively Evaluated for Impairment	682	613
Total	794	731
Consumer [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	2
Associated Allowance
Individually Evaluated for Impairment	$ 0

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

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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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-Name Accounting Standards Codification

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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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