CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME:
Loans, including fees	$ 69,627	$ 58,004
Taxable investment securities	2,634	2,155
Federal Home Loan Bank stock and other	1,572	724
Total interest income	73,833	60,883
INTEREST EXPENSE:
Deposits	3,360	1,879
Securities sold under agreements to repurchase and other short-term borrowings	213	25
Federal Home Loan Bank advances	2,274	2,292
Subordinated note	321	249
Total interest expense	6,168	4,445
NET INTEREST INCOME	67,665	56,438
Provision for loan and lease losses	17,255	12,351
NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES	50,410	44,087
NONINTEREST INCOME:
Service charges on deposit accounts	3,555	3,247
Net refund transfer fees	16,352	15,382
Mortgage banking income	1,020	1,160
Interchange fee income	2,667	2,326
Program fees	1,696	1,091
Increase in cash surrender value of bank owned life insurance	371	391
Net gains on other real estate owned	132	142
Other	1,752	1,184
Total noninterest income	27,545	24,923
NONINTEREST EXPENSE:
Salaries and employee benefits	23,834	21,211
Occupancy and equipment, net	6,221	5,967
Communication and transportation	1,382	1,272
Marketing and development	916	1,004
FDIC insurance expense	525	450
Bank franchise tax expense	2,518	2,435
Data processing	2,386	1,652
Interchange related expense	1,007	1,058
Supplies	381	527
Other real estate owned expense	45	97
Legal and professional fees	1,043	752
Other	2,787	2,514
Total noninterest expense	43,045	38,939
INCOME BEFORE INCOME TAX EXPENSE	34,910	30,071
INCOME TAX EXPENSE	7,441	10,054
NET INCOME	$ 27,469	$ 20,017
Class A Common Stock
BASIC EARNINGS PER SHARE:
Basic earnings per share (in dollars per share)	$ 1.32	$ 0.97
DILUTED EARNINGS PER SHARE:
Diluted earnings per share (in dollars per share)	1.32	0.96
DIVIDENDS DECLARED PER COMMON SHARE:
Dividend declared per common share (in dollars per share)	0.242	0.209
Class B Common Stock
BASIC EARNINGS PER SHARE:
Basic earnings per share (in dollars per share)	1.21	0.88
DILUTED EARNINGS PER SHARE:
Diluted earnings per share (in dollars per share)	1.20	0.88
DIVIDENDS DECLARED PER COMMON SHARE:
Dividend declared per common share (in dollars per share)	$ 0.220	$ 0.190