Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest and Dividend Income
Loans, including fees	$ 238,069	$ 168,976
Mortgage loans held for sale, including fees	1,154	971
Investment securities:
Taxable interest	25,328	17,864
Tax-exempt interest	2,766	2,063
Other	3,226	2,659
Total interest and dividend income	270,543	192,533
Deposits:
NOW and MMDA	21,228	11,100
Savings	432	320
Time deposits	6,584	4,638
Short-term borrowings	2,524	277
Long-term debt	6,886	3,380
Total interest expense	37,654	19,715
Net interest income	232,889	172,818
Provision for loan and lease losses	7,986	6,154
Net interest income after provision for loan and lease losses	224,903	166,664
Non-interest Income
Mortgage income	9,595	14,115
Service charges on deposit accounts	12,908	11,153
Title revenue	5,027	4,741
Broker commissions	2,221	2,547
ATM/debit card fee income	2,633	2,483
Credit card and merchant-related income	2,907	2,298
Trust Department Income	3,426	1,912
Income from bank owned life insurance	1,282	1,311
Gain (loss) on sale of available for sale securities	(59)	0
Other non-interest income	4,626	4,564
Total non-interest income	44,566	45,124
Non-interest Expense
Salaries and employee benefits	104,586	81,853
Net occupancy and equipment	20,047	16,021
Communication and delivery	3,902	3,044
Marketing and business development	4,752	3,424
Data processing	12,393	6,362
Professional services	7,391	5,335
Credit and other loan related expense	4,618	4,526
Insurance	7,105	4,529
Travel and entertainment	3,237	2,484
Amortization of Intangible Assets	5,102	1,770
Errors, fines, and losses	8,757	2,658
Other non-interest expense	6,406	6,790
Total non-interest expense	188,296	138,796
Income before income tax expense	81,173	72,992
Income tax expense	17,552	22,519
Net Income	63,621	50,473
Less: Preferred stock dividends	3,598	3,599
Net Income Available to Common Shareholders	60,023	46,874
Less: Earnings allocated to unvested restricted stock	639	346
Earnings allocated to common shareholders	$ 59,384	$ 46,528
Earnings per common share - Basic (in usd per share)	$ 1.11	$ 1.01
Earnings per common share - Diluted (in usd per share)	1.10	1.00
Cash dividends declared per common share (in usd per share)	$ 0.38	$ 0.36
Comprehensive Income
Net income	$ 63,621	$ 50,473
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during the period (net of tax effects of $14,223 and $2,421, respectively)	(53,506)	4,496
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $13 and $0, respectively)	(46)	0
Unrealized gains (losses) on securities, net of tax	(53,460)	4,496
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 $678 and $39, respectively)	2,549	73
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $31 and $24, respectively)	(116)	(45)
Fair value of derivative instruments designated as cash flow hedges, net of tax	2,665	118
Other comprehensive income (loss), net of tax	(50,795)	4,614
Comprehensive income	$ 12,826	$ 55,087