CONSOLIDATED STATEMENTS OF INCOME - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income:
Interest and fees on loans	$ 78,083,000	$ 63,589,000	$ 227,903,000	$ 186,839,000
Interest and dividends on investment securities:
Taxable interest income	10,247,000	7,357,000	31,583,000	19,670,000
Non-taxable interest income	1,180,000	1,166,000	3,456,000	3,630,000
Other interest income	2,181,000	649,000	4,496,000	1,580,000
Total interest income	91,691,000	72,761,000	267,438,000	211,719,000
Interest expense:
Deposits	14,753,000	8,946,000	41,407,000	21,837,000
Federal funds purchased and securities sold under agreements to repurchase	579,000	426,000	1,789,000	1,139,000
Short-term borrowings	200,000	324,000	885,000	1,257,000
Long-term debt	700,000	245,000	2,020,000	622,000
Senior notes	400,000	400,000	1,199,000	1,199,000
Subordinated notes	731,000	792,000	2,193,000	2,379,000
Junior subordinated debt owed to unconsolidated trusts	852,000	854,000	2,658,000	2,383,000
Total interest expense	18,215,000	11,987,000	52,151,000	30,816,000
Net interest income	73,476,000	60,774,000	215,287,000	180,903,000
Provision for loan losses	3,411,000	758,000	8,039,000	4,024,000
Net interest income after provision for loan losses	70,065,000	60,016,000	207,248,000	176,879,000
Non-interest income:
Mortgage revenue	3,331,000	1,272,000	8,127,000	4,488,000
Net gains on sales of securities	296,000		112,000	160,000
Unrealized gains (losses) recognized on equity securities	65,000		(735,000)
Other income	4,801,000	2,406,000	11,023,000	6,896,000
Total non-interest income	30,936,000	21,853,000	84,777,000	67,141,000
Non-interest expense:
Salaries, wages and employee benefits	38,747,000	26,024,000	105,356,000	80,315,000
Net occupancy expense of premises	4,652,000	3,761,000	13,365,000	11,271,000
Furniture and equipment expenses	2,489,000	1,715,000	6,936,000	5,418,000
Data processing	5,032,000	4,016,000	15,049,000	12,391,000
Amortization of intangible assets	2,360,000	1,445,000	6,866,000	4,450,000
Other expense	14,841,000	8,968,000	45,732,000	30,429,000
Total non-interest expense	68,121,000	45,929,000	193,304,000	144,274,000
Income before income taxes	32,880,000	35,940,000	98,721,000	99,746,000
Income taxes	8,052,000	9,081,000	24,339,000	26,108,000
Net income	$ 24,828,000	$ 26,859,000	$ 74,382,000	$ 73,638,000
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.55	$ 1.36	$ 1.51
Diluted earnings per common share (in dollars per share)	0.45	0.55	1.35	1.50
Dividends declared per share of common stock (in dollars per share)	$ 0.21	$ 0.20	$ 0.63	$ 0.60
Fees for customer services
Non-interest income:
Non-interest income	$ 9,842,000	$ 7,340,000	$ 27,635,000	$ 21,576,000
Trust fees
Non-interest income:
Non-interest income	7,689,000	6,324,000	24,122,000	20,573,000
Commissions and brokers fees, net
Non-interest income:
Non-interest income	1,132,000	881,000	3,216,000	2,860,000
Remittance processing
Non-interest income:
Non-interest income	$ 3,780,000	$ 3,630,000	$ 11,277,000	$ 10,588,000