CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income:
Interest and fees on loans	$ 304,193	$ 251,249	$ 202,643
Interest and dividends on investment securities:
Taxable interest income	41,090	27,595	16,359
Non-taxable interest income	4,631	4,698	3,856
Other interest income	6,320	2,491	1,444
Total interest income	356,234	286,033	224,302
Interest expense:
Deposits	55,077	32,601	12,932
Federal funds purchased and securities sold under agreements to repurchase	2,348	1,626	978
Short-term borrowings	1,041	1,536	1,096
Long-term debt	2,608	906	550
Senior notes	1,599	1,598	962
Subordinated notes	2,924	3,110	1,892
Junior subordinated debt owed to unconsolidated trusts	3,414	3,250	2,526
Total interest expense	69,011	44,627	20,936
Net interest income	287,223	241,406	203,366
Provision for loan losses	10,406	4,429	5,303
Net interest income after provision for loan losses	276,817	236,977	198,063
Non-interest income:
Mortgage revenue	11,703	5,545	11,140
Income on bank owned life insurance	5,795	3,726	2,579
Net gains on sales of securities	741	(1,831)	1,143
Unrealized (losses) gains recognized on equity securities	(759)	2,162
Other income	8,649	6,193	5,307
Total non-interest income	116,415	89,993	84,474
Non-interest expense:
Salaries, wages and employee benefits	140,473	107,844	95,633
Data processing	21,511	16,383	16,716
Net occupancy expense of premises	18,176	14,803	13,830
Furniture and equipment expenses	9,506	7,233	7,089
Professional fees	11,104	5,389	6,814
Amortization of intangible assets	9,547	5,854	5,245
Other expense	48,477	35,537	29,099
Total non-interest expense	258,794	193,043	174,426
Income before income taxes	134,438	133,927	108,111
Income taxes	31,485	34,999	45,385
Net income	$ 102,953	$ 98,928	$ 62,726
Basic earnings per common share (in dollars per share)	$ 1.88	$ 2.02	$ 1.47
Diluted earnings per common share (in dollars per share)	1.87	2.01	1.45
Dividends declared per share of common stock (in dollars per share)	$ 0.84	$ 0.80	$ 0.72
Wealth management fees
Non-interest income:
Non-interest income	$ 38,561	$ 30,974	$ 27,037
Fees for customer services
Non-interest income:
Non-interest income	36,683	28,879	25,841
Remittance processing
Non-interest income:
Non-interest income	$ 15,042	$ 14,345	$ 11,427