Loans (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Balance in the recorded investment in loans and allowance for loan losses by portfolio segment and based on impairment method
Loans	$ 1,721,350	$ 1,584,594	$ 1,544,845
Loans individually evaluated for impairment	22,507	29,329	22,139
Loans collectively evaluated for impairment	1,696,413	1,555,265	1,522,706
Balance: loans acquired with deteriorated credit quality	2,430
Allowance for loan losses
Balance at the beginning of the period	31,881	29,745	25,543
Provision	6,550	11,500	12,600
Charge-offs	(11,964)	(10,498)	(9,121)
Recoveries	2,055	1,134	723
Balance at the end of the period	28,522	31,881	29,745
Allowance for loans individually evaluated for impairment	1,452	3,617	2,561
Allowance for loans collectively evaluated for impairment	27,070	28,264	27,184
Commercial and industrial
Balance in the recorded investment in loans and allowance for loan losses by portfolio segment and based on impairment method
Loans	510,739	426,930	393,729
Loans individually evaluated for impairment	7,579	8,667	5,459
Loans collectively evaluated for impairment	502,535	418,263	388,270
Balance: loans acquired with deteriorated credit quality	625
Allowance for loan losses
Balance at the beginning of the period	5,949	7,364	2,796
Provision	1,583	3,024	5,475
Charge-offs	(457)	(4,523)	(1,015)
Recoveries	569	84	108
Balance at the end of the period	7,644	5,949	7,364
Allowance for loans individually evaluated for impairment	762	156	954
Allowance for loans collectively evaluated for impairment	6,882	5,793	6,410
Construction and development excluding undeveloped land
Balance in the recorded investment in loans and allowance for loan losses by portfolio segment and based on impairment method
Loans	91,719	85,456	147,637
Loans individually evaluated for impairment	26	10,863	2,416
Loans collectively evaluated for impairment	90,428	120,390	145,221
Balance: loans acquired with deteriorated credit quality	1,265
Allowance for loan losses
Balance at the beginning of the period	4,536	3,546	2,280
Provision	(2,119)	2,716	2,859
Charge-offs	(25)	(1,726)	(1,593)
Recoveries	163
Balance at the end of the period	2,555	4,536	3,546
Allowance for loans individually evaluated for impairment		2,898	10
Allowance for loans collectively evaluated for impairment	2,555	1,638	3,536
Undeveloped land
Balance in the recorded investment in loans and allowance for loan losses by portfolio segment and based on impairment method
Loans	37,871	45,797
Loans individually evaluated for impairment	7,340
Loans collectively evaluated for impairment	30,531
Allowance for loan losses
Provision	13,256
Charge-offs	(7,961)
Recoveries	81
Balance at the end of the period	5,376
Allowance for loans collectively evaluated for impairment	5,376
Real estate mortgage
Balance in the recorded investment in loans and allowance for loan losses by portfolio segment and based on impairment method
Loans	1,046,823	989,631	966,665
Loans individually evaluated for impairment	7,478	9,795	14,170
Loans collectively evaluated for impairment	1,038,824	979,836	952,495
Balance: loans acquired with deteriorated credit quality	521
Allowance for loan losses
Balance at the beginning of the period	14,288	11,182	12,272
Provision	490	6,308	4,592
Charge-offs	(2,758)	(3,451)	(5,840)
Recoveries	584	249	158
Balance at the end of the period	12,604	14,288	11,182
Allowance for loans individually evaluated for impairment	606	563	1,597
Allowance for loans collectively evaluated for impairment	11,998	13,725	9,585
Consumer
Balance in the recorded investment in loans and allowance for loan losses by portfolio segment and based on impairment method
Loans	34,198	36,780	36,814
Loans individually evaluated for impairment	84	4	94
Loans collectively evaluated for impairment	34,095	36,776	36,720
Balance: loans acquired with deteriorated credit quality	19
Allowance for loan losses
Balance at the beginning of the period	362	540	623
Provision	86	(181)	133
Charge-offs	(763)	(798)	(673)
Recoveries	658	801	457
Balance at the end of the period	343	362	540
Allowance for loans individually evaluated for impairment	84
Allowance for loans collectively evaluated for impairment	259	362	540
Unallocated
Allowance for loan losses
Balance at the beginning of the period	6,746	7,113	7,572
Provision	(6,746)	(367)	(459)
Balance at the end of the period		6,746	7,113
Allowance for loans collectively evaluated for impairment		$ 6,746	$ 7,113