Loans - Contractual Aging of Recorded Investment in Past Due Loans (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	$ 5,322	$ 2,047	[1]
Accruing 60-89 Days Past Due	543	1,281	[1]
Accruing Greater Than 90 Days	213	160	[1]
Nonaccrual	21,140	27,672	[1]	40,955
Current	1,794,667	1,273,047	[1]
Total Financing Receivables	1,821,885	1,304,207	[1]
Portfolio Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	1,511
Accruing 60-89 Days Past Due	184
Accruing Greater Than 90 Days	17
Nonaccrual	18,563
Current	1,467,730
Total Financing Receivables	1,488,005
Purchased Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	95
Accruing 60-89 Days Past Due	359
Accruing Greater Than 90 Days	116
Nonaccrual	2,572
Current	4,672
Total Financing Receivables	7,814
Purchased Unimpaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	3,716
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	80
Nonaccrual	5
Current	322,265
Total Financing Receivables	326,066
Commercial and Financial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due		353	[1]
Accruing 60-89 Days Past Due		0	[1]
Accruing Greater Than 90 Days		0	[1]
Nonaccrual		13	[1]
Current		78,270	[1]
Total Financing Receivables		78,636	[1]
Commercial and Financial [Member] | Portfolio Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	232
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	0
Current	120,531
Total Financing Receivables	120,763
Commercial and Financial [Member] | Purchased Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	0
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	0
Current	1,312
Total Financing Receivables	1,312
Commercial and Financial [Member] | Purchased Unimpaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	953
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	0
Current	34,368
Total Financing Receivables	35,321
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due		33	[1]
Accruing 60-89 Days Past Due		27	[1]
Accruing Greater Than 90 Days		0	[1]
Nonaccrual		541	[1]
Current		44,112	[1]
Total Financing Receivables		44,713	[1]
Consumer [Member] | Portfolio Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	256
Accruing 60-89 Days Past Due	25
Accruing Greater Than 90 Days	0
Nonaccrual	191
Current	50,071
Total Financing Receivables	50,543
Consumer [Member] | Purchased Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	0
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	0
Current	2
Total Financing Receivables	2
Consumer [Member] | Purchased Unimpaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	0
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	0
Current	2,352
Total Financing Receivables	2,352
Construction and land development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due		3	[1]
Accruing 60-89 Days Past Due		0	[1]
Accruing Greater Than 90 Days		0	[1]
Nonaccrual		1,302	[1]
Current		66,145	[1]
Total Financing Receivables	87,036	67,450	[1]
Construction and land development [Member] | Portfolio Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	0
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	534
Current	65,362
Total Financing Receivables	65,896
Construction and land development [Member] | Purchased Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	0
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	1,428
Current	129
Total Financing Receivables	1,557
Construction and land development [Member] | Purchased Unimpaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	303
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	0
Current	19,280
Total Financing Receivables	19,583
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due		684	[1]
Accruing 60-89 Days Past Due		345	[1]
Accruing Greater Than 90 Days		0	[1]
Nonaccrual		5,111	[1]
Current		514,242	[1]
Total Financing Receivables	837,147	520,382	[1]
Commercial real estate [Member] | Portfolio Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	764
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	3,457
Current	606,642
Total Financing Receivables	610,863
Commercial real estate [Member] | Purchased Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	7
Accruing 60-89 Days Past Due	359
Accruing Greater Than 90 Days	0
Nonaccrual	733
Current	2,993
Total Financing Receivables	4,092
Commercial real estate [Member] | Purchased Unimpaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	2,318
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	41
Nonaccrual	0
Current	219,833
Total Financing Receivables	222,192
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due		974	[1]
Accruing 60-89 Days Past Due		909	[1]
Accruing Greater Than 90 Days		160	[1]
Nonaccrual		20,705	[1]
Current		569,998	[1]
Total Financing Receivables	686,897	592,746	[1]
Residential Real Estate [Member] | Portfolio Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	259
Accruing 60-89 Days Past Due	159
Accruing Greater Than 90 Days	17
Nonaccrual	14,381
Current	624,612
Total Financing Receivables	639,428
Residential Real Estate [Member] | Purchased Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	88
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	116
Nonaccrual	411
Current	236
Total Financing Receivables	851
Residential Real Estate [Member] | Purchased Unimpaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	142
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	39
Nonaccrual	5
Current	46,432
Total Financing Receivables	46,618
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due		0	[1]
Accruing 60-89 Days Past Due		0	[1]
Accruing Greater Than 90 Days		0	[1]
Nonaccrual		0	[1]
Current		280	[1]
Total Financing Receivables		280	[1]
Other [Member] | Portfolio Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	0
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	0
Current	512
Total Financing Receivables	512
Other [Member] | Purchased Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	0
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	0
Current	0
Total Financing Receivables	0
Other [Member] | Purchased Unimpaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing 30-59 Days Past Due	0
Accruing 60-89 Days Past Due	0
Accruing Greater Than 90 Days	0
Nonaccrual	0
Current	0
Total Financing Receivables	$ 0

[1] All purchased loans disclosed were acquired in 2014 and were therefore not presented as part of this table.