CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
INTEREST INCOME:
Loans, including fees	$ 53,944	$ 44,735	$ 123,571	$ 102,739
Taxable investment securities	2,708	2,391	5,342	4,546
Federal Home Loan Bank stock and other	1,704	695	3,276	1,419
Total interest income	58,356	47,821	132,189	108,704
INTEREST EXPENSE:
Deposits	3,934	2,324	7,294	4,203
Securities sold under agreements to repurchase and other short-term borrowings	222	146	435	171
Federal Home Loan Bank advances	2,723	1,943	4,997	4,235
Subordinated note	393	271	714	520
Total interest expense	7,272	4,684	13,440	9,129
NET INTEREST INCOME	51,084	43,137	118,749	99,575
Provision for loan and lease losses	4,932	5,061	22,187	17,412
NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES	46,152	38,076	96,562	82,163
NONINTEREST INCOME:
Service charges on deposit accounts	3,574	3,390	7,129	6,637
Net refund transfer fees	3,473	2,770	19,825	18,152
Mortgage banking income	1,316	1,445	2,336	2,605
Interchange fee income	2,891	2,547	5,558	4,873
Program fees	1,323	1,284	3,019	2,375
Increase in cash surrender value of bank owned life insurance	379	393	750	784
Net gains on other real estate owned	320	249	452	391
Other	1,020	849	2,772	2,033
Total noninterest income	14,296	12,927	41,841	37,850
NONINTEREST EXPENSE:
Salaries and employee benefits	22,766	20,015	46,600	41,226
Occupancy and equipment, net	6,391	5,903	12,612	11,870
Communication and transportation	1,241	939	2,623	2,211
Marketing and development	1,283	1,409	2,199	2,413
FDIC insurance expense	345	300	870	750
Bank franchise tax expense	860	790	3,378	3,225
Data processing	2,443	1,695	4,829	3,347
Interchange related expense	1,098	1,071	2,105	2,129
Supplies	303	261	684	788
Other real estate owned expense	16	132	61	229
Legal and professional fees	728	596	1,771	1,348
Other	3,158	2,623	5,945	5,137
Total noninterest expense	40,632	35,734	83,677	74,673
INCOME BEFORE INCOME TAX EXPENSE	19,816	15,269	54,726	45,340
INCOME TAX EXPENSE	4,150	5,198	11,591	15,252
NET INCOME	$ 15,666	$ 10,071	$ 43,135	$ 30,088
Class A Common Stock
BASIC EARNINGS PER SHARE:
Basic earnings per share (in dollars per share)	$ 0.75	$ 0.48	$ 2.08	$ 1.45
DILUTED EARNINGS PER SHARE:
Diluted earnings per share (in dollars per share)	0.74	0.48	2.06	1.45
DIVIDENDS DECLARED PER COMMON SHARE:
Dividend declared per common share (in dollars per share)	0.242	0.220	0.484	0.429
Class B Common Stock
BASIC EARNINGS PER SHARE:
Basic earnings per share (in dollars per share)	0.68	0.44	1.89	1.32
DILUTED EARNINGS PER SHARE:
Diluted earnings per share (in dollars per share)	0.68	0.44	1.88	1.32
DIVIDENDS DECLARED PER COMMON SHARE:
Dividend declared per common share (in dollars per share)	$ 0.220	$ 0.200	$ 0.440	$ 0.390