CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans receivable:
Taxable	$ 342,501	$ 263,704	$ 210,302
Tax exempt	14,862	10,694	6,525
Investment securities:
Taxable	21,597	17,489	16,415
Tax exempt	25,509	21,379	18,622
Deposits with financial institutions	2,241	736	350
Federal Reserve and Federal Home Loan Bank stock	1,234	894	1,098
Total Interest Income	407,944	314,896	253,312
INTEREST EXPENSE
Deposits	51,542	23,806	15,914
Federal funds purchased	718	561	102
Securities sold under repurchase agreements	762	477	374
Federal Home Loan Bank advances	7,832	5,196	3,264
Subordinated debentures and term loans	8,233	7,572	7,185
Total Interest Expense	69,087	37,612	26,839
NET INTEREST INCOME	338,857	277,284	226,473
Provision for loan losses	7,227	9,143	5,657
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	331,630	268,141	220,816
OTHER INCOME
Increase in cash surrender value of life insurance	4,020	3,906	3,630
Gains on life insurance benefits	198	2,671	643
Net gains and fees on sales of loans	7,029	7,564	7,052
Net realized gains on sales of available for sale securities	4,269	2,631	3,389
Other income	5,192	2,970	3,594
Total Other Income	76,459	71,009	65,203
OTHER EXPENSES
Salaries and employee benefits	131,704	119,812	102,552
Net occupancy	18,341	16,976	16,997
Equipment	14,334	13,090	12,497
Marketing	4,681	3,739	3,008
Outside data processing fees	13,215	12,242	9,148
Printing and office supplies	1,425	1,283	1,348
Intangible asset amortization	6,719	5,647	3,910
FDIC assessments	2,920	2,564	3,036
Other real estate owned and foreclosure expenses	1,470	1,903	2,877
Professional and other outside services	8,176	12,757	6,516
Other expenses	16,966	15,543	15,470
Total Other Expenses	219,951	205,556	177,359
INCOME BEFORE INCOME TAX	188,138	133,594	108,660
Income tax expense	28,999	37,524	27,609
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 159,139	$ 96,070	$ 81,051
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS PER SHARE DATA:
Basic (in dollars per share)	$ 3.23	$ 2.13	$ 1.99
Diluted (in dollars per share)	$ 3.22	$ 2.12	$ 1.98
Service charges on deposit accounts
OTHER INCOME
OTHER INCOME	$ 20,950	$ 18,722	$ 17,762
Fiduciary activities
OTHER INCOME
OTHER INCOME	14,906	14,682	12,591
Other customer fees
OTHER INCOME
OTHER INCOME	$ 19,895	$ 17,863	$ 16,542