Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income:
Loans, including fees	$ 150,998	$ 143,605	$ 111,626
Investment securities:
Taxable interest income	4,269	4,941	4,601
Nontaxable interest income	135	292	335
Other	2,576	445	80
Total interest income	157,978	149,283	116,642
Interest expense:
Deposits	15,722	13,194	11,349
Short-term borrowings	928	1,424	650
Subordinated debt	6,080	5,830	3,805
Total interest expense	22,730	20,448	15,804
Net interest income	135,248	128,835	100,838
Provision for loan losses	4,275	8,231	4,351
Net interest income after provision for loan losses	130,973	120,604	96,487
Noninterest income:
Service charges on deposit accounts	6,019	5,941	4,955
Other fees and charges	8,402	7,664	5,304
Mortgage banking activities	98,797	101,577	85,540
Indirect lending activities	12,533	14,900	18,821
SBA lending activities	4,540	5,659	5,265
Bank owned life insurance	1,670	2,374	2,440
Securities gains (losses)	0	578	(329)
Other	2,991	2,632	5,892
Total noninterest income	134,952	141,325	127,888
Noninterest expense:
Salaries and employee benefits	103,366	96,684	76,871
Commissions	34,573	33,907	27,342
Occupancy	18,164	17,890	15,877
Professional and other services	18,343	15,224	12,119
Other	36,424	37,315	30,737
Total noninterest expense	210,870	201,020	162,946
Income before income tax expense	55,055	60,909	61,429
Income tax expense	15,259	22,143	22,294
Net income	$ 39,796	$ 38,766	$ 39,135
Earnings per common share:
Basic earnings per share (in dollars per share)	$ 1.50	$ 1.52	$ 1.77
Diluted earnings per share (in dollars per share)	$ 1.49	$ 1.50	$ 1.64
Change in net unrealized (losses) on available-for-sale securities, net of tax benefit of ($189), ($303), and ($903)	$ (309)	$ (494)	$ (1,474)
Adjustment for net (gains) / losses included in net income, net of tax (expense) / benefit of $0, ($220), and $125	0	(358)	204
Total other comprehensive loss, net of tax	(309)	(852)	(1,270)
Comprehensive income	$ 39,487	$ 37,914	$ 37,865