CONSOLIDATED STATEMENTS OF INCOME - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income:
Interest and fees on loans	$ 78,031,000	$ 62,290,000	$ 149,820,000	$ 123,250,000
Interest and dividends on investment securities:
Taxable interest income	11,152,000	6,323,000	21,336,000	12,313,000
Non-taxable interest income	1,200,000	1,204,000	2,276,000	2,464,000
Other interest income	1,083,000	508,000	2,315,000	931,000
Total interest income	91,466,000	70,325,000	175,747,000	138,958,000
Interest expense:
Deposits	14,154,000	6,904,000	26,654,000	12,891,000
Federal funds purchased and securities sold under agreements to repurchase	627,000	372,000	1,210,000	713,000
Short-term borrowings	494,000	457,000	685,000	933,000
Long-term debt	741,000	213,000	1,320,000	377,000
Senior notes	399,000	399,000	799,000	799,000
Subordinated notes	731,000	794,000	1,462,000	1,587,000
Junior subordinated debt owed to unconsolidated trusts	892,000	814,000	1,806,000	1,529,000
Total interest expense	18,038,000	9,953,000	33,936,000	18,829,000
Net interest income	73,428,000	60,372,000	141,811,000	120,129,000
Provision for loan losses	2,517,000	2,258,000	4,628,000	3,266,000
Net interest income after provision for loan losses	70,911,000	58,114,000	137,183,000	116,863,000
Non-interest income:
Mortgage revenue	2,851,000	1,573,000	4,796,000	3,216,000
Net (losses) gains on sales of securities	(10,000)	160,000	(184,000)	160,000
Unrealized (losses) gains recognized on equity securities	(1,016,000)		(800,000)
Other income	3,170,000	2,595,000	6,222,000	4,490,000
Total non-interest income	27,896,000	22,802,000	53,841,000	45,288,000
Non-interest expense:
Salaries, wages and employee benefits	34,268,000	25,472,000	66,609,000	54,291,000
Net occupancy expense of premises	4,511,000	3,689,000	8,713,000	7,510,000
Furniture and equipment expenses	2,352,000	1,790,000	4,447,000	3,703,000
Data processing	5,616,000	4,030,000	10,017,000	8,375,000
Amortization of intangible assets	2,412,000	1,490,000	4,506,000	3,005,000
Other expense	18,861,000	10,834,000	30,891,000	21,461,000
Total non-interest expense	68,020,000	47,305,000	125,183,000	98,345,000
Income before income taxes	30,787,000	33,611,000	65,841,000	63,806,000
Income taxes	6,702,000	8,749,000	16,287,000	17,027,000
Net income	$ 24,085,000	$ 24,862,000	$ 49,554,000	$ 46,779,000
Basic earnings per common share (in dollars per share)	$ 0.43	$ 0.51	$ 0.91	$ 0.96
Diluted earnings per common share (in dollars per share)	0.43	0.51	0.90	0.95
Dividends declared per share of common stock (in dollars per share)	$ 0.21	$ 0.20	$ 0.42	$ 0.40
Fees for customer services
Non-interest income:
Non-interest income	$ 9,696,000	$ 7,290,000	$ 17,793,000	$ 14,236,000
Trust fees
Non-interest income:
Non-interest income	8,318,000	6,735,000	16,433,000	14,249,000
Commissions and brokers fees, net
Non-interest income:
Non-interest income	1,170,000	883,000	2,084,000	1,979,000
Remittance processing
Non-interest income:
Non-interest income	$ 3,717,000	$ 3,566,000	$ 7,497,000	$ 6,958,000