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	$ 270,476	$ 179,266	$ 508,545	$ 348,242
Mortgage loans held for sale, including fees	836	1,248	1,990	2,219
Investment securities:
Taxable interest	26,617	20,246	51,945	38,110
Tax-exempt interest	2,708	2,060	5,474	4,124
Other	3,186	1,755	6,412	4,413
Total interest and dividend income	303,823	204,575	574,366	397,108
Deposits:
NOW and MMDA	26,533	12,207	47,761	23,306
Savings	521	329	953	649
Time deposits	9,105	4,576	15,689	9,214
Short-term borrowings	3,327	227	5,851	504
Long-term debt	8,224	3,593	15,110	6,974
Total interest expense	47,710	20,932	85,364	40,647
Net interest income	256,113	183,643	489,002	356,461
Provision for loan and lease losses	7,595	12,050	15,581	18,204
Net interest income after provision for loan and lease losses	248,518	171,593	473,421	338,257
Non-interest Income
Mortgage income	13,721	19,730	23,316	33,845
Service charges on deposit accounts	12,950	11,410	25,858	22,563
Title revenue	6,846	6,190	11,873	10,931
Broker commissions	2,396	2,562	4,617	5,109
ATM/debit card fee income	2,925	2,646	5,558	5,129
Credit card and merchant-related income	3,326	2,727	6,233	5,025
Trust Department Income	4,243	2,026	7,669	3,939
Income from bank owned life insurance	1,261	1,241	2,543	2,552
Gain (loss) on sale of available for sale securities	3	59	(56)	59
Other non-interest income	6,269	5,247	10,895	9,810
Total non-interest income	53,940	53,838	98,506	98,962
Non-interest Expense
Salaries and employee benefits	107,445	86,317	212,031	168,170
Net occupancy and equipment	19,931	16,292	39,978	32,313
Communication and delivery	4,213	2,956	8,115	6,000
Marketing and business development	4,895	3,238	9,647	6,662
Data processing	9,309	6,713	21,702	13,074
Professional services	7,160	11,219	14,551	16,553
Credit and other loan related expense	5,190	3,780	9,808	8,306
Insurance	6,946	4,486	14,051	9,016
Travel and entertainment	2,797	2,753	6,034	5,237
Amortization of acquisition intangibles	6,111	1,651	11,213	3,421
Errors, fines, and losses	15,700	544	24,457	3,202
Other non-interest expense	7,180	5,431	13,586	12,222
Total non-interest expense	196,877	145,380	385,173	284,176
Income before income tax expense	105,581	80,051	186,754	153,043
Income tax expense	30,457	28,033	48,009	50,552
Net Income	75,124	52,018	138,745	102,491
Less: Preferred stock dividends	949	949	4,547	4,548
Net Income Available to Common Shareholders	74,175	51,069	134,198	97,943
Less: Earnings allocated to unvested restricted stock	767	361	1,409	707
Earnings allocated to common shareholders	$ 73,408	$ 50,708	$ 132,789	$ 97,236
Earnings per common share - Basic (in usd per share)	$ 1.31	$ 1.00	$ 2.42	$ 2.01
Earnings per common share - Diluted (in usd per share)	1.30	0.99	2.41	1.99
Cash dividends declared per common share (in usd per share)	$ 0.38	$ 0.36	$ 0.76	$ 0.72
Comprehensive Income
Net income	$ 75,124	$ 52,018	$ 138,745	$ 102,491
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during the period (net of tax effects of $4,449, $4,537, $18,672, and $6,958, respectively)	(16,734)	8,426	(70,240)	12,922
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $1, $21, $12, and $21, respectively)	2	38	(44)	38
Unrealized gains (losses) on securities, net of tax	(16,736)	8,388	(70,196)	12,884
Fair value of derivative instruments designated as cash flow hedges:
Change in fair value of derivative instruments designated as cash flow hedges during the period (net of tax effects of $371, $537, $1,048, and $497, respectively)	1,395	(996)	3,944	(923)
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $11, $55, $42, and $80, respectively)	(40)	(103)	(156)	(148)
Fair value of derivative instruments designated as cash flow hedges, net of tax	1,435	(893)	4,100	(775)
Other comprehensive income (loss), net of tax	(15,301)	7,495	(66,096)	12,109
Comprehensive income	$ 59,823	$ 59,513	$ 72,649	$ 114,600