Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest and dividend income
Loans and leases, including fees	$ 296,790	$ 283,125	$ 878,355	$ 791,670
Mortgage loans held for sale, including fees	1,936	1,037	4,578	3,027
Taxable securities	27,883	27,113	93,461	79,058
Tax-exempt securities	2,049	2,680	6,399	8,154
Other	4,520	3,112	12,436	9,524
Total interest and dividend income	333,178	317,067	995,229	891,433
Interest expense
Deposits	70,753	44,401	196,854	108,804
Short-term borrowings	3,880	4,727	14,793	10,578
Long-term debt	9,212	8,714	28,426	23,824
Total interest expense	83,845	57,842	240,073	143,206
Net interest income	249,333	259,225	755,156	748,227
Provision for credit losses	8,986	11,384	33,504	27,290
Net interest income after provision for credit losses	240,347	247,841	721,652	720,937
Non-interest income
Income from bank owned life insurance	1,760	1,744	5,307	4,287
Securities gains (losses), net	27	0	(987)	(56)
Other non-interest income	7,114	3,583	15,415	10,971
Total non-interest income	63,674	53,087	175,008	151,593
Non-interest expense
Salaries and employee benefits	103,257	101,159	304,928	313,190
Net occupancy and equipment	21,316	18,889	58,879	58,867
Communication and delivery	3,634	3,773	10,931	11,888
Marketing and business development	3,163	4,068	10,651	13,715
Computer services expense	9,638	9,036	28,178	30,738
Professional services	6,323	5,519	17,017	20,070
Credit and other loan related expense	4,532	4,830	11,532	14,313
Insurance	4,825	6,536	13,276	20,587
Travel and entertainment	2,185	1,846	7,353	7,880
Amortization of acquisition intangibles	4,410	5,382	14,205	16,595
Impairment of long-lived assets and other (gains) losses	(309)	467	1,251	24,924
Other non-interest expense	9,688	7,557	22,832	21,143
Total non-interest expense	172,662	169,062	501,033	553,910
Income before income tax expense	131,359	131,866	395,627	318,620
Income tax expense	31,509	30,401	94,048	78,410
Net income	99,850	101,465	301,579	240,210
Less: Preferred stock dividends	3,599	3,599	8,146	8,146
Net income available to common shareholders	96,251	97,866	293,433	232,064
Less: Earnings allocated to unvested restricted stock	874	908	2,806	2,341
Earnings allocated to common shareholders	$ 95,377	$ 96,958	$ 290,627	$ 229,723
Earnings per common share - Basic (in usd per share)	$ 1.83	$ 1.74	$ 5.47	$ 4.17
Earnings per common share - Diluted (in usd per share)	1.82	1.73	5.43	4.14
Cash dividends declared per common share (in usd per share)	$ 0.45	$ 0.39	$ 1.31	$ 1.15
Comprehensive income
Net income	$ 99,850	$ 101,465	$ 301,579	$ 240,210
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during the period (net of tax effects of $2,294, $5,906, $27,805, and $24,578, respectively)	6,975	(22,220)	93,491	(92,460)
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $7, $0, $244, and $12, respectively)	20	0	(743)	(44)
Unrealized gains (losses) on securities, net of tax	6,955	(22,220)	94,234	(92,416)
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 $86, $217, $903, and $1,266, respectively)	(264)	818	1,992	4,762
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $53, $6, $154, and $47, respectively)	(162)	(22)	(467)	(178)
Fair value of derivative instruments designated as cash flow hedges, net of tax	(102)	840	2,459	4,940
Other comprehensive income (loss), net of tax	6,853	(21,380)	96,693	(87,476)
Comprehensive income	106,703	80,085	398,272	152,734
Mortgage income
Non-interest income
Non-interest income	17,432	12,729	47,725	36,045
Service charges on deposit accounts
Non-interest income
Non-interest income	13,209	13,520	38,866	39,378
Title revenue
Non-interest income
Non-interest income	7,170	6,280	19,290	18,153
Broker commissions
Non-interest income
Non-interest income	1,800	2,627	5,797	7,244
ATM and debit card fee income
Non-interest income
Non-interest income	2,948	2,470	8,562	8,028
Credit card and merchant-related income
Non-interest income
Non-interest income	3,400	3,114	10,037	9,347
Trust department income
Non-interest income
Non-interest income	4,281	3,993	12,836	11,662
Commission income
Non-interest income
Non-interest income	$ 4,533	$ 3,027	$ 12,160	$ 6,534