Loans - Age Analysis of Loans (Details 6) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual status, days past due	90 days
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	$ 3,867	$ 14,320
90 Days or More Past Due		16
Total loans past due and still accruing	3,867	14,336
Nonaccrual	6,114	4,844
Purchased Credit Impaired	9,920	14,154
Current	1,874,841	1,765,821
Loans held for investment	1,894,742	1,799,155	$ 1,433,702
Originated [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	2,602	10,006
90 Days or More Past Due		16
Total loans past due and still accruing	2,602	10,022
Nonaccrual	4,602	4,274
Current	1,696,723	1,546,435
Loans held for investment	1,703,927	1,560,731
Acquired [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	1,265	4,314
Total loans past due and still accruing	1,265	4,314
Nonaccrual	1,512	570
Purchased Credit Impaired	9,920	14,154
Current	178,118	219,386
Loans held for investment	190,815	238,424
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired	1,302	2,432
Loans held for investment	795,483	788,410	710,915
Commercial & Industrial [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	877	7,266
Total loans past due and still accruing	877	7,266
Nonaccrual	2,655	1,789
Current	773,562	750,755
Loans held for investment	777,094	759,810
Commercial & Industrial [Member] | Acquired [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	110	137
Total loans past due and still accruing	110	137
Nonaccrual	449
Purchased Credit Impaired	1,302	2,432
Current	16,528	26,031
Loans held for investment	18,389	28,600
Owner occupied commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired	1,046	1,248
Loans held for investment	176,453	163,592	142,484
Owner occupied commercial real estate [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due		1,464
Total loans past due and still accruing		1,464
Nonaccrual	1,429	173
Current	160,283	146,560
Loans held for investment	161,712	148,197
Owner occupied commercial real estate [Member] | Acquired [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired	1,046	1,248
Current	13,695	14,147
Loans held for investment	14,741	15,395
Commerical real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired	4,523	7,261
Loans held for investment	383,863	339,006	281,882
Commerical real estate [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	1,181
Total loans past due and still accruing	1,181
Current	359,729	308,521
Loans held for investment	360,910	308,521
Commerical real estate [Member] | Acquired [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	1,134	1,141
Total loans past due and still accruing	1,134	1,141
Nonaccrual	532	570
Purchased Credit Impaired	4,523	7,261
Current	16,764	21,513
Loans held for investment	22,953	30,485
Construction, land & land development [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired	51	72
Loans held for investment	290,469	240,666	188,691
Construction, land & land development [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	315	677
Total loans past due and still accruing	315	677
Nonaccrual	503	940
Current	283,421	228,526
Loans held for investment	284,239	230,143
Construction, land & land development [Member] | Acquired [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due		2,048
Total loans past due and still accruing		2,048
Purchased Credit Impaired	51	72
Current	6,179	8,403
Loans held for investment	6,230	10,523
Residential mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired	2,998	3,141
Loans held for investment	234,026	257,066	104,913
Residential mortgage [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due		382
90 Days or More Past Due		16
Total loans past due and still accruing		398
Nonaccrual	15	1,277
Current	108,083	105,600
Loans held for investment	108,098	107,275
Residential mortgage [Member] | Acquired [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	12	981
Total loans past due and still accruing	12	981
Nonaccrual	529
Purchased Credit Impaired	2,998	3,141
Current	122,389	145,669
Loans held for investment	125,928	149,791
Consumer and other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	14,448	10,415	$ 4,817
Consumer and other [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	229	217
Total loans past due and still accruing	229	217
Nonaccrual		95
Current	11,645	6,473
Loans held for investment	11,874	6,785
Consumer and other [Member] | Acquired [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-89 Past Due	9	7
Total loans past due and still accruing	9	7
Nonaccrual	2
Current	2,563	3,623
Loans held for investment	$ 2,574	$ 3,630