CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans receivable:
Taxable	$ 263,704	$ 210,302	$ 180,805
Tax exempt	10,694	6,525	3,459
Investment securities:
Taxable	17,489	16,415	17,885
Tax exempt	21,379	18,622	16,922
Deposits with financial institutions	736	350	160
Federal Reserve and Federal Home Loan Bank stock	894	1,098	1,967
Total Interest Income	314,896	253,312	221,198
INTEREST EXPENSE
Deposits	23,806	15,914	14,855
Federal funds purchased	561	102	74
Securities sold under repurchase agreements	477	374	368
Federal Home Loan Bank advances	5,196	3,264	2,836
Subordinated debentures and term loans	7,572	7,185	6,661
Total Interest Expense	37,612	26,839	24,794
NET INTEREST INCOME	277,284	226,473	196,404
Provision for loan losses	9,143	5,657	417
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	268,141	220,816	195,987
OTHER INCOME
Service charges on deposit accounts	18,722	17,762	16,201
Fiduciary activities	11,589	9,818	9,196
Other customer fees	20,956	19,315	16,959
Commission income			4,147
Increase in cash surrender value of life insurance	3,906	3,630	2,919
Gains on life insurance benefits	2,671	643
Net gains and fees on sales of loans	7,564	7,052	6,483
Realized securities gains reclassified into income	2,631	3,389	2,670
Gain on sale of insurance subsidiary			8,265
Gain on cancellation of subordinated debentures			1,250
Other income	2,970	3,594	1,778
Total Other Income	71,009	65,203	69,868
OTHER EXPENSES
Salaries and employee benefits	119,812	102,552	101,908
Net occupancy	16,976	16,997	14,668
Equipment	13,090	12,497	10,787
Marketing	3,739	3,008	3,493
Outside data processing fees	12,242	9,148	7,109
Printing and office supplies	1,283	1,348	1,353
Intangible asset amortization	5,647	3,910	2,835
FDIC assessments	2,564	3,036	3,655
Other real estate owned and foreclosure expenses	1,903	2,877	3,956
Professional and other outside services	12,757	6,516	9,855
Other expenses	15,543	15,470	15,187
Total Other Expenses	205,556	177,359	174,806
INCOME BEFORE INCOME TAX	133,594	108,660	91,049
Income tax expense	37,524	27,609	25,665
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 96,070	$ 81,051	$ 65,384
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS PER SHARE DATA:
Basic (in dollars per share)	$ 2.13	$ 1.99	$ 1.73
Diluted (in dollars per share)	$ 2.12	$ 1.98	$ 1.72