Loans and reserve for credit losses (Schedule of Accounts, Notes, Loans and Financing Receivable) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Commercial real estate:
Owner occupied		$ 308,331	$ 259,109
Non-owner occupied		526,562	497,543
Total commercial real estate loans		834,893	756,652
Construction		130,352	125,428
Residential real estate		298,390	204,687
Commercial and industrial		384,444	368,475
Consumer		39,850	37,298
Total loans		1,687,929	1,492,540
Less:
Deferred loan fees, net		(1,419)	(1,703)
Reserve for loan losses		(24,415)	(22,053)
Loans, net		$ 1,662,095	$ 1,468,784
Owner occupied, Percent		18.30%	17.40%
Non-owner occupied, Percent		31.20%	33.30%
Total commercial real estate loans, Percent		49.50%	50.70%
Construction, Percent		7.70%	8.40%
Residential real estate, Percent		17.70%	13.70%
Commercial and industrial, Percent		22.80%	24.70%
Consumer, Percent		2.30%	2.50%
Total loans, percent		100.00%	100.00%
Originated Loans, Receivable
Commercial real estate:
Owner occupied	[1]	$ 263,095	$ 198,845
Non-owner occupied	[1]	431,379	383,287
Total commercial real estate loans	[1]	694,474	582,132
Construction	[1]	119,723	100,437
Residential real estate	[1]	237,084	122,478
Commercial and industrial	[1]	363,335	342,746
Consumer	[1]	38,362	34,897
Total loans	[1]	1,452,978	1,182,690
Less:
Deferred loan fees, net	[1]	(1,419)	(1,703)
Reserve for loan losses	[1]	(24,415)	(22,053)
Loans, net	[1]	$ 1,427,144	$ 1,158,934
Owner occupied, Percent	[1]	18.10%	16.80%
Non-owner occupied, Percent	[1]	29.70%	32.40%
Total commercial real estate loans, Percent	[1]	47.80%	49.20%
Construction, Percent	[1]	8.20%	8.50%
Residential real estate, Percent	[1]	16.30%	10.40%
Commercial and industrial, Percent	[1]	25.00%	29.00%
Consumer, Percent	[1]	2.70%	2.90%
Total loans, percent	[1]	100.00%	100.00%
Acquired Loans, Receivable
Commercial real estate:
Owner occupied	[2]	$ 45,236	$ 60,264
Non-owner occupied	[2]	95,183	114,256
Total commercial real estate loans	[2]	140,419	174,520
Construction	[2]	10,629	24,991
Residential real estate	[2]	61,306	82,209
Commercial and industrial	[2]	21,109	25,729
Consumer	[2]	1,488	2,401
Total loans	[2]	$ 234,951	$ 309,850
Less:
Owner occupied, Percent	[2]	19.30%	19.40%
Non-owner occupied, Percent	[2]	40.50%	36.90%
Total commercial real estate loans, Percent	[2]	59.80%	56.30%
Construction, Percent	[2]	4.50%	8.10%
Residential real estate, Percent	[2]	26.10%	26.50%
Commercial and industrial, Percent	[2]	9.00%	8.30%
Consumer, Percent	[2]	0.60%	0.80%
Total loans, percent	[2]	100.00%	100.00%

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

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