Loans and reserve for credit losses (Schedule of Accounts, Notes, Loans and Financing Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Commercial real estate:
Owner occupied	$ 256,062		$ 204,998
Non-owner occupied	496,121		347,014
Total commercial real estate loans	752,183		552,012
Construction	105,011		52,503
Residential real estate	198,879		101,557
Commercial and industrial	300,733		254,170
Consumer	38,122		35,990
Total loans	1,394,928		996,232
Less:
Deferred loan fees	(1,548)
Reserve for loan losses	(20,471)		(20,857)
Loans, net, Amount	1,372,909		973,618
Owner occupied, Percent	18.30%
Non-owner occupied, Percent	35.60%
Total commercial real estate loans, Percent	53.90%
Construction, Percent	7.50%
Residential real estate, Percent	14.30%
Commercial and industrial, Percent	21.60%
Consumer, Percent	2.70%
Total loans, Percent	100.00%
Originated Loans
Commercial real estate:
Owner occupied	190,712	[1]	204,998	[1]
Non-owner occupied	365,827	[1]	347,014	[1]
Total commercial real estate loans	556,539	[1]	552,012	[1]
Construction	54,320	[1]	52,503	[1]
Residential real estate	101,975	[1]	101,557	[1]
Commercial and industrial	269,019	[1]	254,170	[1]
Consumer	34,805	[1]	35,990	[1]
Total loans	1,016,658	[1]	996,232	[1]
Less:
Deferred loan fees	(1,548)	[1]	(1,757)	[1]
Reserve for loan losses	(20,471)	[1]	(20,857)	[1]
Loans, net, Amount	994,639	[1]	973,618	[1]
Owner occupied, Percent	18.80%	[1]	20.60%	[1]
Non-owner occupied, Percent	36.00%	[1]	34.80%	[1]
Total commercial real estate loans, Percent	54.80%	[1]	55.40%	[1]
Construction, Percent	5.30%	[1]	5.30%	[1]
Residential real estate, Percent	10.00%	[1]	10.20%	[1]
Commercial and industrial, Percent	26.50%	[1]	25.50%	[1]
Consumer, Percent	3.40%	[1]	3.60%	[1]
Total loans, Percent	100.00%	[1]	100.00%	[1]
Acquired Loans
Commercial real estate:
Owner occupied	52,267	[2]
Non-owner occupied	110,650	[2]
Total commercial real estate loans	162,917	[2]
Construction	48,127	[2]
Residential real estate	83,776	[2]
Commercial and industrial	27,093	[2]
Consumer	2,757	[2]
Total loans	324,670	[2],[3]
Less:
Reserve for loan losses	0	[2]
Loans, net, Amount	324,670	[2]
Owner occupied, Percent	16.20%	[2]
Non-owner occupied, Percent	34.10%	[2]
Total commercial real estate loans, Percent	50.30%	[2]
Construction, Percent	14.80%	[2]
Residential real estate, Percent	25.80%	[2]
Commercial and industrial, Percent	8.30%	[2]
Consumer, Percent	0.80%	[2]
Total loans, Percent	100.00%	[2]
Acquired Covered Loans
Commercial real estate:
Owner occupied	13,083	[4]
Non-owner occupied	19,644	[4]
Total commercial real estate loans	32,727	[4]
Construction	2,564	[4]
Residential real estate	13,128	[4]
Commercial and industrial	4,621	[4]
Consumer	560	[4]
Total loans	53,600	[4],[5]
Less:
Reserve for loan losses	0	[4]
Loans, net, Amount	$ 53,600	[4]
Owner occupied, Percent	24.40%	[4]
Non-owner occupied, Percent	36.70%	[4]
Total commercial real estate loans, Percent	61.10%	[4]
Construction, Percent	4.80%	[4]
Residential real estate, Percent	24.50%	[4]
Commercial and industrial, Percent	8.60%	[4]
Consumer, Percent	1.00%	[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