CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest on securities
Taxable	$ 34,442	$ 26,133	$ 20,341
Nontaxable	913	1,036	585
Interest and fees on loans	153,825	119,217	94,469
Interest on federal funds sold and other investments	2,416	1,669	1,022
Total interest income	191,596	148,055	116,417
INTEREST EXPENSE
Interest on savings deposits	3,654	2,593	2,085
Interest on time certificates	4,678	2,074	1,228
Interest on federal funds purchased and other short term borrowings	781	484	340
Interest on Federal Home Loan Bank borrowings	3,744	1,256	1,643
Interest on subordinated debt	2,443	2,060	1,634
Total interest expense	15,300	8,467	6,930
NET INTEREST INCOME	176,296	139,588	109,487
Provision for loan losses	5,648	2,411	2,644
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	170,648	137,177	106,843
NONINTEREST INCOME (Note M)
Bargain purchase gain	0	0	416
Gain on sale of VISA stock	15,153	0	0
Securities gains, net (includes net gains of $1,950, and net losses of ($617) and ($325) in other comprehensive income reclassifications for 2017, 2016, and 2015 respectively)	86	368	161
Other	43,230	37,427	32,018
Total noninterest income	58,469	37,795	32,595
NONINTEREST EXPENSE (Note M)	149,916	130,881	103,770
INCOME BEFORE INCOME TAXES	79,201	44,091	35,668
Income taxes	36,336	14,889	13,527
NET INCOME	$ 42,865	$ 29,202	$ 22,141
Net income per share of common stock
Diluted (in dollars per share)	$ 0.99	$ 0.78	$ 0.66
Basic (in dollars per share)	$ 1.01	$ 0.79	$ 0.66
Average common shares outstanding
Diluted (in shares)	43,350,314	37,508,046	33,744,171
Basic (in shares)	42,613,086	36,872,007	33,495,827