Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest and Dividend Income
Loans, including fees	$ 283,125	$ 216,888	$ 791,670	$ 565,130
Mortgage loans held for sale, including fees	1,037	1,209	3,027	3,429
Investment securities:
Taxable interest	27,113	24,067	79,058	62,177
Tax-exempt interest	2,680	2,179	8,154	6,303
Other	3,112	2,629	9,524	7,041
Total interest and dividend income	317,067	246,972	891,433	644,080
Deposits:
NOW and MMDA	31,367	15,633	79,128	38,940
Savings	550	401	1,503	1,050
Time deposits	12,484	5,766	28,173	14,980
Short-term borrowings	4,727	4,152	10,578	4,655
Long-term debt	8,714	4,137	23,824	11,111
Total interest expense	57,842	30,089	143,206	70,736
Net interest income	259,225	216,883	748,227	573,344
Provision for loan and lease losses	11,097	18,514	26,678	36,718
Net interest income after provision for loan and lease losses	248,128	198,369	721,549	536,626
Non-interest Income
Income from bank owned life insurance	1,744	1,263	4,287	3,815
Gain (loss) on sale of available for sale securities	0	(242)	(56)	(183)
Other non-interest income	6,607	5,481	17,502	15,291
Total non-interest income	53,087	50,843	151,593	149,805
Non-interest Expense
Salaries and employee benefits	101,159	106,970	313,190	275,140
Net occupancy and equipment	18,889	19,139	58,867	51,452
Communication and delivery	3,773	3,533	11,888	9,534
Marketing and business development	4,068	3,706	13,715	10,368
Data processing	9,036	12,300	30,738	25,374
Professional services	5,519	22,550	20,070	39,104
Credit and other loan related expense	5,117	7,532	14,925	15,838
Insurance	6,536	6,264	20,587	15,279
Travel and entertainment	1,846	2,601	7,880	7,837
Amortization of acquisition intangibles	5,382	4,527	16,595	7,948
Errors, fines, and losses	467	4,714	24,924	7,916
Other non-interest expense	7,557	6,926	21,143	19,148
Total non-interest expense	169,349	200,762	554,522	484,938
Income before income tax expense	131,866	48,450	318,620	201,493
Income tax expense	30,401	18,806	78,410	69,358
Net Income	101,465	29,644	240,210	132,135
Less: Preferred stock dividends	3,599	3,598	8,146	8,146
Net Income Available to Common Shareholders	97,866	26,046	232,064	123,989
Less: Earnings allocated to unvested restricted stock	908	283	2,341	1,052
Earnings allocated to common shareholders	$ 96,958	$ 25,763	$ 229,723	$ 122,937
Earnings per common share - Basic (in usd per share)	$ 1.74	$ 0.49	$ 4.17	$ 2.47
Earnings per common share - Diluted (in usd per share)	1.73	0.49	4.14	2.45
Cash dividends declared per common share (in usd per share)	$ 0.39	$ 0.37	$ 1.15	$ 1.09
Comprehensive Income
Net income	$ 101,465	$ 29,644	$ 240,210	$ 132,135
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during the period (net of tax effects of $5,906, $472, $24,578, and $7,430, respectively)	(22,220)	877	(92,460)	13,799
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $0, $85, $12, and $64, respectively)	0	(157)	(44)	(119)
Unrealized gains (losses) on securities, net of tax	(22,220)	1,034	(92,416)	13,918
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 $217, $24, $1,266, and $314, respectively)	818	(158)	4,762	(1,081)
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $6, $55, $47, and $134, respectively)	(22)	(101)	(178)	(249)
Fair value of derivative instruments designated as cash flow hedges, net of tax	840	(57)	4,940	(832)
Other comprehensive income (loss), net of tax	(21,380)	977	(87,476)	13,086
Comprehensive income	80,085	30,621	152,734	145,221
Mortgage income
Non-interest Income
Non-interest Income	12,732	16,050	36,048	49,895
Service charges on deposit accounts
Non-interest Income
Non-interest Income	13,520	12,534	39,378	35,097
Title revenue
Non-interest Income
Non-interest Income	6,280	5,643	18,153	16,574
Broker commissions
Non-interest Income
Non-interest Income	2,627	2,094	7,244	7,203
ATM/debit card fee income
Non-interest Income
Non-interest Income	2,470	2,486	8,028	7,615
Credit card and merchant-related income
Non-interest Income
Non-interest Income	3,114	2,848	9,347	7,873
Trust department income
Non-interest Income
Non-interest Income	$ 3,993	$ 2,686	$ 11,662	$ 6,625