CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
INTEREST INCOME:
Loans, including fees	$ 44,735	$ 37,746	$ 102,739	$ 79,175
Taxable investment securities	2,391	1,983	4,546	3,875
Federal Home Loan Bank stock and other	695	411	1,419	1,105
Total interest income	47,821	40,140	108,704	84,155
INTEREST EXPENSE:
Deposits	2,324	1,347	4,203	2,739
Securities sold under agreements to repurchase and other short-term borrowings	146	15	171	40
Federal Home Loan Bank advances	1,943	2,973	4,235	5,926
Subordinated note	271	228	520	439
Total interest expense	4,684	4,563	9,129	9,144
NET INTEREST INCOME	43,137	35,577	99,575	75,011
Provision for loan and lease losses	5,061	1,814	17,412	7,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES	38,076	33,763	82,163	68,011
NONINTEREST INCOME:
Service charges on deposit accounts	3,390	3,282	6,637	6,422
Net refund transfer fees	2,770	1,909	18,152	18,987
Mortgage banking income	1,445	1,560	2,605	2,821
Interchange fee income	2,547	2,217	4,873	4,340
Program fees	1,284	664	2,375	963
Increase in cash surrender value of bank owned life insurance	393	369	784	708
Net gains on other real estate owned	249	80	391	328
Other	849	721	2,033	1,154
Total noninterest income	12,927	10,802	37,850	35,723
NONINTEREST EXPENSES:
Salaries and employee benefits	20,015	17,814	41,226	34,897
Occupancy and equipment, net	5,903	5,109	11,870	10,528
Communication and transportation	939	872	2,211	1,945
Marketing and development	1,409	1,190	2,413	1,697
FDIC insurance expense	300	480	750	1,138
Bank franchise tax expense	790	647	3,225	3,098
Data processing	1,695	1,543	3,347	2,876
Interchange related expense	1,071	1,047	2,129	1,951
Supplies	261	240	788	689
Other real estate owned expense	132	116	229	196
Legal and professional fees	596	604	1,348	1,427
Other	2,623	2,204	5,137	3,965
Total noninterest expenses	35,734	31,866	74,673	64,407
Income before income tax expense	15,269	12,699	45,340	39,327
INCOME TAX EXPENSE	5,198	4,359	15,252	13,252
NET INCOME	$ 10,071	$ 8,340	$ 30,088	$ 26,075
Class A Common Stock
BASIC EARNINGS PER SHARE:
Basic earnings per share (in dollars per share)	$ 0.48	$ 0.40	$ 1.45	$ 1.26
DILUTED EARNINGS PER SHARE:
Diluted earnings per share (in dollars per share)	0.48	0.40	1.45	1.26
DIVIDENDS DECLARED PER COMMON SHARE:
Dividend declared per common share (in dollars per share)	0.220	0.209	0.429	0.407
Class B Common Stock
BASIC EARNINGS PER SHARE:
Basic earnings per share (in dollars per share)	0.44	0.37	1.32	1.14
DILUTED EARNINGS PER SHARE:
Diluted earnings per share (in dollars per share)	0.44	0.37	1.32	1.14
DIVIDENDS DECLARED PER COMMON SHARE:
Dividend declared per common share (in dollars per share)	$ 0.200	$ 0.190	$ 0.390	$ 0.370