Consolidated Statements of Earnings - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Interest and dividend income:      
Interest and fees on loans $ 71,225 $ 52,720 $ 29,812
Interest and dividends on taxable investment securities 1,813 1,154 1,178
Interest on non-taxable investment securities 802 466 169
Interest on interest-bearing deposits and federal funds sold 723 505 183
Total interest income 74,563 54,845 31,342
Interest expense:      
Interest on deposits 6,127 4,354 2,427
Interest on borrowings 294 442 442
Interest on subordinated debt 960
Total interest expense 7,381 4,796 2,869
Net interest income 67,182 50,049 28,473
Provision for loan losses 3,248 1,113 978
Net interest income after provision for loan losses 63,934 48,936 27,495
Other income:      
Service charges and fees on deposit accounts 2,019 1,288 714
Mortgage origination and fee income 6,975 5,278 3,752
Merchant sponsorship revenue 2,168 861
Income from bank-owned life insurance 810 433 242
Wealth management fees 49 53 58
Gain (loss) on other real estate 244 (24) 13
Loss on sale of investment securities available-for-sale (33)
Other 1,691 570 286
Total other income 13,956 8,459 5,032
Other expense:      
Salaries and employee benefits 27,735 21,364 13,379
Commission-based compensation 4,091 3,744 2,136
Occupancy and equipment 4,640 3,584 1,944
Core deposit intangible amortization 756 508 18
Other 11,857 11,045 5,976
Total other expense 49,079 40,245 23,453
Earnings before income taxes 28,811 17,150 9,074
Income tax expense 9,394 5,476 3,159
Net earnings 19,417 11,674 5,915
Less: Net earnings attributable to noncontrolling interest 1,564 2,069 512
Net earnings attributable to National Commerce Corporation $ 17,853 $ 9,605 $ 5,403
Basic earnings per common share (in dollars per share) $ 1.64 $ 1.04 $ 0.92
Diluted earnings per common share (in dollars per share) $ 1.61 $ 1.02 $ 0.91