Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
INTEREST AND DIVIDEND INCOME
Loans, including fees	$ 96,415	$ 78,538	$ 191,917	$ 147,671
Interest and dividends on securities:
Taxable	16,444	14,194	33,175	25,738
Tax-exempt	5,142	5,055	10,684	9,890
Total interest and dividends on securities	21,586	19,249	43,859	35,628
Other interest income	1,542	1,101	2,820	1,904
Total interest and dividend income	119,543	98,888	238,596	185,203
INTEREST EXPENSE
Interest bearing demand deposits	4,314	3,150	8,259	5,673
Money market deposits	2,009	1,093	3,908	1,972
Savings deposits	678	227	1,200	416
Certificates of deposit	4,098	2,977	8,001	5,513
Total interest expense on deposits	11,099	7,447	21,368	13,574
Federal Home Loan Bank borrowings	6,287	5,953	12,624	10,451
Other short-term borrowings	1,483	973	3,039	1,532
Subordinated debt and junior subordinated debt	2,214	2,168	4,743	4,110
Total interest expense	21,083	16,541	41,774	29,667
NET INTEREST INCOME	98,460	82,347	196,822	155,536
Provision for credit losses	2,747	1,708	5,254	3,876
Net interest income after provision for credit losses	95,713	80,639	191,568	151,660
NON-INTEREST INCOME
Electronic banking fees	7,154	5,728	13,046	10,558
Net securities brokerage revenue	1,973	1,809	3,833	3,479
Bank-owned life insurance	1,340	1,128	2,659	3,884
Mortgage banking income	1,618	1,670	2,674	2,776
Net securities gains	2,909	358	3,566	319
Net gain on other real estate owned and other assets	376	229	512	491
Other income	3,250	1,588	6,438	3,760
Total non-interest income	31,156	23,408	58,929	47,491
NON-INTEREST EXPENSE
Salaries and wages	31,646	26,872	62,585	51,878
Employee benefits	9,705	7,965	19,694	14,877
Net occupancy	5,385	4,103	10,951	8,759
Equipment	4,818	4,095	9,651	8,044
Marketing	1,254	1,405	2,497	2,521
FDIC insurance	1,155	868	2,508	1,526
Amortization of intangible assets	2,465	1,312	4,978	2,397
Restructuring and merger-related expense	81	5,412	3,188	5,657
Other operating expenses	15,443	11,511	30,333	22,455
Total non-interest expense	71,952	63,543	146,385	118,114
Income before provision for income taxes	54,917	40,504	104,112	81,037
Provision for income taxes	10,103	7,335	18,961	14,339
NET INCOME	$ 44,814	$ 33,169	$ 85,151	$ 66,698
EARNINGS PER COMMON SHARE
Basic	$ 0.82	$ 0.71	$ 1.56	$ 1.47
Diluted	$ 0.82	$ 0.71	$ 1.56	$ 1.47
AVERAGE COMMON SHARES OUTSTANDING
Basic	54,628,029	46,498,305	54,613,346	45,281,264
Diluted	54,733,521	46,639,780	54,724,209	45,417,010
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.31	$ 0.29	$ 0.62	$ 0.58
COMPREHENSIVE INCOME	$ 67,025	$ 26,893	$ 127,135	$ 45,904
Total Trust Fees [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	6,339	5,752	13,454	12,255
Service Charges on Deposits [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	$ 6,197	$ 5,146	$ 12,747	$ 9,969