CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest on securities
Taxable	$ 35,354	$ 37,860	$ 34,442
Nontaxable	555	884	913
Interest and fees on loans	250,535	199,984	153,825
Interest on federal funds sold and other investments	3,379	2,670	2,416
Total Interest Income	289,823	241,398	191,596
Interest Expense
Interest on savings deposits	16,621	8,763	3,654
Interest on time certificates	21,776	11,684	4,678
Interest on federal funds purchased and other short term borrowings	1,431	1,804	781
Interest on Federal Home Loan Bank borrowings	3,010	4,468	3,744
Interest on subordinated debt	3,367	3,164	2,443
Total Interest Expense	46,205	29,883	15,300
Net Interest Income	243,618	211,515	176,296
Provision for loan losses	10,999	11,730	5,648
Net Interest Income After Provision for Loan Losses	232,619	199,785	170,648
Noninterest Income (Note M)
Gain on sale of Visa stock	0	0	15,153
Securities gains (losses), net (includes net gains of $6.2 million for 2019, net losses of $96 thousand for 2018 and net gains of $2.0 million for 2017 in other comprehensive income reclassifications)	1,217	(623)	86
Other	55,515	50,645	43,230
Total Noninterest Income	56,732	50,022	58,469
Noninterest Expense (Note M)	160,739	162,273	149,916
Income Before Income Taxes	128,612	87,534	79,201
Income taxes	29,873	20,259	36,336
Net Income	$ 98,739	$ 67,275	$ 42,865
Net income per share of common stock
Diluted (in dollars per share)	$ 1.90	$ 1.38	$ 0.99
Basic (in dollars per share)	$ 1.92	$ 1.40	$ 1.01
Average common shares outstanding
Diluted (in shares)	52,029	48,748	43,350
Basic (in shares)	51,449	47,969	42,613