Loans and reserve for credit losses (Schedule of Accounts, Notes, Loans and Financing Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Commercial real estate:
Owner occupied	$ 264,163		$ 204,998
Non-owner occupied	487,144		347,014
Total commercial real estate loans	751,307		552,012
Construction	115,120		52,503
Residential real estate	190,223		101,557
Commercial and industrial	372,514		254,170
Consumer	37,546		35,990
Total loans	1,466,710		996,232
Less:
Deferred loan fees	(1,907)
Reserve for loan losses	(21,351)		(20,857)
Loans, net, Amount	1,443,452		973,618
Owner occupied, Percent	18.00%
Non-owner occupied, Percent	33.20%
Total commercial real estate loans, Percent	51.20%
Construction, Percent	7.80%
Residential real estate, Percent	13.00%
Commercial and industrial, Percent	25.40%
Consumer, Percent	2.60%
Total loans, Percent	100.00%
Originated Loans
Commercial real estate:
Owner occupied	202,015	[1]	204,998	[1]
Non-owner occupied	362,102	[1]	347,014	[1]
Total commercial real estate loans	564,117	[1]	552,012	[1]
Construction	82,825	[1]	52,503	[1]
Residential real estate	102,004	[1]	101,557	[1]
Commercial and industrial	342,994	[1]	254,170	[1]
Consumer	34,661	[1]	35,990	[1]
Total loans	1,126,601	[1]	996,232	[1]
Less:
Deferred loan fees	(1,907)	[1]	(1,757)	[1]
Reserve for loan losses	(21,351)	[1]	(20,857)	[1]
Loans, net, Amount	1,103,343	[1]	973,618	[1]
Owner occupied, Percent	17.90%	[1]	20.60%	[1]
Non-owner occupied, Percent	32.10%	[1]	34.80%	[1]
Total commercial real estate loans, Percent	50.00%	[1]	55.40%	[1]
Construction, Percent	7.40%	[1]	5.30%	[1]
Residential real estate, Percent	9.10%	[1]	10.20%	[1]
Commercial and industrial, Percent	30.40%	[1]	25.50%	[1]
Consumer, Percent	3.10%	[1]	3.60%	[1]
Total loans, Percent	100.00%	[1]	100.00%	[1]
Acquired Loans
Commercial real estate:
Owner occupied	49,284	[2]
Non-owner occupied	106,344	[2]
Total commercial real estate loans	155,628	[2]
Construction	29,775	[2]
Residential real estate	76,453	[2]
Commercial and industrial	25,775	[2]
Consumer	2,416	[2]
Total loans	290,047	[2],[3]
Less:
Reserve for loan losses	0	[2]
Loans, net, Amount	290,047	[2]
Owner occupied, Percent	17.00%	[2]
Non-owner occupied, Percent	36.70%	[2]
Total commercial real estate loans, Percent	53.70%	[2]
Construction, Percent	10.30%	[2]
Residential real estate, Percent	26.30%	[2]
Commercial and industrial, Percent	8.90%	[2]
Consumer, Percent	0.80%	[2]
Total loans, Percent	100.00%	[2]
Acquired Covered Loans
Commercial real estate:
Owner occupied	12,864	[4]
Non-owner occupied	18,698	[4]
Total commercial real estate loans	31,562	[4]
Construction	2,520	[4]
Residential real estate	11,766	[4]
Commercial and industrial	3,745	[4]
Consumer	469	[4]
Total loans	50,062	[4],[5]
Less:
Reserve for loan losses	0	[4]
Loans, net, Amount	$ 50,062	[4]
Owner occupied, Percent	25.70%	[4]
Non-owner occupied, Percent	37.40%	[4]
Total commercial real estate loans, Percent	63.10%	[4]
Construction, Percent	5.00%	[4]
Residential real estate, Percent	23.50%	[4]
Commercial and industrial, Percent	7.50%	[4]
Consumer, Percent	0.90%	[4]
Total loans, Percent	100.00%	[4]

[1] Originated loans are loans organically made through the Company's normal and customary origination process

[2] Acquired loans are loans acquired in the acquisition of Home, discussed elsewhere in this report

[3] Acquired loans are loans acquired in the acquisition of Home, discussed elsewhere in this report, less acquired covered loans

[4] Acquired covered loans are loans in the Home portfolio that are covered under FDIC loss share agreements

[5] Acquired covered loans acquired in the acquisition of Home that are covered under FDIC loss share agreements