CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans receivable:
Taxable	$ 382,772	$ 342,501	$ 263,704
Tax exempt	17,568	14,862	10,694
Investment securities:
Taxable	27,815	21,597	17,489
Tax exempt	31,655	25,509	21,379
Deposits with financial institutions	4,225	2,241	736
Federal Home Loan Bank stock	1,370	1,234	894
Total Interest Income	465,405	407,944	314,896
INTEREST EXPENSE
Deposits	91,585	51,542	23,806
Federal funds purchased	251	718	561
Securities sold under repurchase agreements	1,424	762	477
Federal Home Loan Bank advances	7,176	7,832	5,196
Subordinated debentures and term loans	8,309	8,233	7,572
Total Interest Expense	108,745	69,087	37,612
NET INTEREST INCOME	356,660	338,857	277,284
Provision for loan losses	2,800	7,227	9,143
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	353,860	331,630	268,141
OTHER INCOME
Net gains and fees on sales of loans	7,891	7,029	7,564
Increase in cash surrender value of life insurance	4,518	4,020	3,906
Gains on life insurance benefits	19	198	2,671
Net realized gains on sales of available for sale securities	4,415	4,269	2,631
Other income	2,068	2,699	992
Total Other Income	86,688	76,459	71,009
OTHER EXPENSES
Salaries and employee benefits	144,037	131,704	119,812
Net occupancy	19,584	18,341	16,976
Equipment	16,218	14,334	13,090
Marketing	6,650	4,681	3,739
Outside data processing fees	16,476	13,215	12,242
Printing and office supplies	1,445	1,425	1,283
Intangible asset amortization	5,994	6,719	5,647
FDIC assessments	717	2,920	2,564
Other real estate owned and foreclosure expenses	2,428	1,470	1,903
Professional and other outside services	15,410	8,176	12,757
Other expenses	17,804	16,966	15,543
Total Other Expenses	246,763	219,951	205,556
INCOME BEFORE INCOME TAX	193,785	188,138	133,594
Income tax expense	29,325	28,999	37,524
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 164,460	$ 159,139	$ 96,070
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS PER SHARE DATA:
Basic (in dollars per share)	$ 3.20	$ 3.23	$ 2.13
Diluted (in dollars per share)	$ 3.19	$ 3.22	$ 2.12
Service charges on deposit accounts
OTHER INCOME
OTHER INCOME	$ 22,951	$ 20,950	$ 18,722
Fiduciary and wealth management fees
OTHER INCOME
OTHER INCOME	17,562	14,906	14,682
Card payment fees
OTHER INCOME
OTHER INCOME	20,243	18,035	16,120
Derivative hedge fees
OTHER INCOME
OTHER INCOME	5,357	2,493	1,978
Other customer fees
OTHER INCOME
OTHER INCOME	$ 1,664	$ 1,860	$ 1,743