Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
INTEREST AND DIVIDEND INCOME
Loans, including fees	$ 78,538	$ 67,360	$ 147,671	$ 132,258
Interest and dividends on securities:
Taxable	14,194	9,375	25,738	18,970
Tax-exempt	5,055	4,864	9,890	9,756
Total interest and dividends on securities	19,249	14,239	35,628	28,726
Other interest income	1,101	561	1,904	1,100
Total interest and dividend income	98,888	82,160	185,203	162,084
INTEREST EXPENSE
Interest bearing demand deposits	3,150	1,506	5,673	2,599
Money market deposits	1,093	644	1,972	1,218
Savings deposits	227	185	416	367
Certificates of deposit	2,977	2,491	5,513	4,902
Total interest expense on deposits	7,447	4,826	13,574	9,086
Federal Home Loan Bank borrowings	5,953	3,145	10,451	5,980
Other short-term borrowings	973	262	1,532	560
Subordinated debt and junior subordinated debt	2,168	1,788	4,110	3,600
Total interest expense	16,541	10,021	29,667	19,226
NET INTEREST INCOME	82,347	72,139	155,536	142,858
Provision for credit losses	1,708	2,383	3,876	5,094
Net interest income after provision for credit losses	80,639	69,756	151,660	137,764
NON-INTEREST INCOME
Electronic banking fees	5,728	4,984	10,558	9,512
Net securities brokerage revenue	1,809	1,680	3,479	3,442
Bank-owned life insurance	1,128	1,367	3,884	2,508
Mortgage banking income	1,670	968	2,776	2,408
Net securities gains	358	494	319	506
Net gain on other real estate owned and other assets	229	342	491	307
Other income	1,588	1,634	3,760	4,674
Total non-interest income	23,408	22,122	47,491	45,006
NON-INTEREST EXPENSE
Salaries and wages	26,872	23,616	51,878	46,618
Employee benefits	7,965	7,731	14,877	15,941
Net occupancy	4,103	4,510	8,759	8,837
Equipment	4,095	4,097	8,044	8,139
Marketing	1,405	2,060	2,521	2,884
FDIC insurance	868	906	1,526	1,733
Amortization of intangible assets	1,312	1,240	2,397	2,513
Restructuring and merger-related expense	5,412		5,657	491
Other operating expenses	11,511	11,724	22,455	23,112
Total non-interest expense	63,543	55,884	118,114	110,268
Income before provision for income taxes	40,504	35,994	81,037	72,502
Provision for income taxes	7,335	9,653	14,339	20,274
NET INCOME	$ 33,169	$ 26,341	$ 66,698	$ 52,228
EARNINGS PER COMMON SHARE
Basic	$ 0.71	$ 0.60	$ 1.47	$ 1.19
Diluted	$ 0.71	$ 0.60	$ 1.47	$ 1.19
AVERAGE COMMON SHARES OUTSTANDING
Basic	46,498,305	43,995,749	45,281,264	43,971,789
Diluted	46,639,780	44,061,421	45,417,010	44,046,812
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.29	$ 0.26	$ 0.58	$ 0.52
COMPREHENSIVE INCOME	$ 26,893	$ 29,065	$ 45,904	$ 57,236
Total Trust Fees [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	5,752	5,572	12,255	11,716
Service Charges on Deposits [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	$ 5,146	$ 5,081	$ 9,969	$ 9,933