Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest and dividend income
Loans and leases, including fees	$ 296,686	$ 270,476	$ 581,565	$ 508,545
Mortgage loans held for sale, including fees	1,588	836	2,642	1,990
Taxable securities	31,662	26,617	65,578	51,945
Tax-exempt securities	2,141	2,708	4,350	5,474
Other	3,890	3,186	7,916	6,412
Total interest and dividend income	335,967	303,823	662,051	574,366
Interest Expense
Deposits	65,866	36,159	126,101	64,403
Short-term borrowings	5,197	3,327	10,913	5,851
Long-term debt	9,565	8,224	19,214	15,110
Total interest expense	80,628	47,710	156,228	85,364
Net interest income	255,339	256,113	505,823	489,002
Provision for credit losses	10,755	7,696	24,518	15,907
Net interest income after provision for credit losses	244,584	248,417	481,305	473,095
Non-interest income
Income from bank owned life insurance	1,750	1,261	3,547	2,543
Securities (losses) gains, net	(1,014)	3	(1,014)	(56)
Other non-interest income	4,250	4,299	8,301	7,387
Total non-interest income	58,825	53,940	111,334	98,506
Non-interest expense
Salaries and employee benefits	103,375	107,445	201,671	212,031
Net occupancy and equipment	18,999	19,931	37,563	39,978
Communication and delivery	3,597	4,213	7,297	8,115
Marketing and business development	3,370	4,895	7,488	9,647
Computer services expense	9,383	9,309	18,540	21,702
Professional services	6,244	7,160	10,694	14,551
Credit and other loan related expense	4,141	5,089	7,000	9,482
Insurance	4,265	6,946	8,451	14,051
Travel and entertainment	2,738	2,797	5,168	6,034
Amortization of acquisition intangibles	4,786	6,111	9,795	11,213
Impairment of long-lived assets and other losses	496	15,700	1,560	24,457
Other non-interest expense	8,224	7,180	13,144	13,586
Total non-interest expense	169,618	196,776	328,371	384,847
Income before income tax expense	133,791	105,581	264,268	186,754
Income tax expense	32,193	30,457	62,539	48,009
Net income	101,598	75,124	201,729	138,745
Less: Preferred stock dividends	949	949	4,547	4,547
Net income available to common shareholders	100,649	74,175	197,182	134,198
Less: Earnings allocated to unvested restricted stock	999	767	1,931	1,409
Earnings allocated to common shareholders	$ 99,650	$ 73,408	$ 195,251	$ 132,789
Earnings per common share - Basic (in usd per share)	$ 1.87	$ 1.31	$ 3.63	$ 2.42
Earnings per common share - Diluted (in usd per share)	1.86	1.30	3.61	2.41
Cash dividends declared per common share (in usd per share)	$ 0.43	$ 0.38	$ 0.86	$ 0.76
Comprehensive income
Net income	$ 101,598	$ 75,124	$ 201,729	$ 138,745
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during the period (net of tax effects of $14,836, $4,449, $25,511, and $18,672, respectively)	45,108	(16,734)	86,516	(70,240)
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $251, $1, $251, and $12, respectively)	(763)	2	(763)	(44)
Unrealized gains (losses) on securities, net of tax	45,871	(16,736)	87,279	(70,196)
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 $1,461, $371, $990, and $1,048, respectively)	4,441	1,395	2,256	3,944
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $26, $11, $100, and $42, respectively)	(78)	(40)	(305)	(156)
Fair value of derivative instruments designated as cash flow hedges, net of tax	4,519	1,435	2,561	4,100
Other comprehensive income (loss), net of tax	50,390	(15,301)	89,840	(66,096)
Comprehensive income	151,988	59,823	291,569	72,649
Mortgage income
Non-interest income
Non-interest income	18,444	13,721	30,293	23,316
Service charges on deposit accounts
Non-interest income
Non-interest income	12,847	12,950	25,657	25,858
Title revenue
Non-interest income
Non-interest income	6,895	6,846	12,120	11,873
Broker commissions
Non-interest income
Non-interest income	2,044	2,396	3,997	4,617
ATM and debit card fee income
Non-interest income
Non-interest income	3,032	2,925	5,614	5,558
Credit card and merchant-related income
Non-interest income
Non-interest income	3,226	3,326	6,637	6,233
Trust department income
Non-interest income
Non-interest income	4,388	4,243	8,555	7,669
Commission income
Non-interest income
Non-interest income	$ 2,963	$ 1,970	$ 7,627	$ 3,508