Consolidated statements of income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income:
Interest and fees on loans	$ 66,276	$ 54,529	$ 126,724	$ 105,222
Interest on securities
Taxable	3,548	3,134	7,117	5,986
Tax-exempt	1,160	981	2,304	1,906
Other	735	399	1,507	777
Total interest income	71,719	59,043	137,652	113,891
Interest expense:
Deposits	13,488	5,898	25,343	10,969
Borrowings	1,208	1,628	2,270	2,976
Total interest expense	14,696	7,526	27,613	13,945
Net interest income	57,023	51,517	110,039	99,946
Provision for loan losses	881	1,063	2,272	1,380
Net interest income after provision for loan losses	56,142	50,454	107,767	98,566
Noninterest income:
Gain (loss) from securities, net	52	(42)	95	(89)
Gain (loss) on sales or write-downs of other real estate owned	277	23	238	(163)
(Loss) gain from other assets	(183)	(155)	8	(87)
Other income	1,691	1,583	3,484	3,026
Total noninterest income	32,979	35,763	62,018	69,038
Noninterest expenses:
Salaries, commissions and employee benefits	37,918	34,366	71,615	68,393
Occupancy and equipment expense	4,319	3,545	8,049	6,969
Legal and professional fees	1,694	1,965	3,419	4,008
Data processing	2,643	2,138	5,027	4,173
Merger costs	3,783	0	4,404	1,193
Amortization of core deposit and other intangibles	1,254	802	1,983	1,655
Regulatory fees and deposit insurance assessments	634	730	1,226	1,292
Advertising	2,434	3,408	5,171	6,690
Other expense	8,818	8,801	17,232	16,876
Total noninterest expense	64,119	56,358	119,220	112,509
Income before income taxes	25,002	29,859	50,565	55,095
Income tax expense (Note 9)	6,314	7,794	12,289	13,276
Net income	$ 18,688	$ 22,065	$ 38,276	$ 41,819
Earnings per common share
Basic (in dollars per share)	$ 0.60	$ 0.72	$ 1.24	$ 1.36
Fully diluted (in dollars per share)	$ 0.59	$ 0.70	$ 1.21	$ 1.33
Mortgage banking income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	$ 24,526	$ 28,544	$ 45,547	$ 55,015
Service charges on deposit accounts
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	2,327	2,049	4,406	4,008
ATM and interchange fees
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	3,002	2,581	5,658	4,942
Investment services and trust income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	1,287	1,180	2,582	2,386
Software license and maintenance fees
Noninterest expenses:
Software license and maintenance fees	$ 622	$ 603	$ 1,094	$ 1,260