Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest and dividend income
Loans and leases, including fees	$ 284,879	$ 238,069
Mortgage loans held for sale, including fees	1,054	1,154
Taxable securities	33,916	25,328
Tax-exempt securities	2,209	2,766
Other	4,026	3,226
Total interest and dividend income	326,084	270,543
Interest Expense
Deposits	60,235	28,244
Short-term borrowings	5,716	2,524
Long-term debt	9,649	6,886
Total interest expense	75,600	37,654
Net interest income	250,484	232,889
Provision for credit losses	13,763	8,211
Net interest income after provision for credit losses	236,721	224,678
Non-interest income
Income from bank owned life insurance	1,797	1,282
Securities gains (losses), net	0	(59)
Other non-interest income	4,051	3,089
Total non-interest income	52,509	44,566
Non-interest expense
Salaries and employee benefits	98,296	104,586
Net occupancy and equipment	18,564	20,047
Communication and delivery	3,700	3,902
Marketing and business development	4,118	4,752
Computer services expense	9,157	12,393
Professional services	4,450	7,391
Credit and other loan related expense	2,859	4,393
Insurance	4,186	7,105
Travel and entertainment	2,430	3,237
Amortization of acquisition intangibles	5,009	5,102
Impairment of long-lived assets and other losses	1,064	8,757
Other non-interest expense	4,920	6,406
Total non-interest expense	158,753	188,071
Income before income tax expense	130,477	81,173
Income tax expense	30,346	17,552
Net income	100,131	63,621
Less: Preferred stock dividends	3,598	3,598
Net income available to common shareholders	96,533	60,023
Less: Earnings allocated to unvested restricted stock	933	639
Earnings allocated to common shareholders	$ 95,600	$ 59,384
Earnings per common share - Basic (in usd per share)	$ 1.76	$ 1.11
Earnings per common share - Diluted (in usd per share)	1.75	1.10
Cash dividends declared per common share (in usd per share)	$ 0.43	$ 0.38
Comprehensive income
Net income	$ 100,131	$ 63,621
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during the period (net of tax effects of $10,675 and $14,223, respectively)	41,408	(53,506)
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $0 and $13, respectively)	0	(46)
Unrealized gains (losses) on securities, net of tax	41,408	(53,460)
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 $471 and $678, respectively)	(2,185)	2,549
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $75 and $31, respectively)	(227)	(116)
Fair value of derivative instruments designated as cash flow hedges, net of tax	(1,958)	2,665
Other comprehensive income (loss), net of tax	39,450	(50,795)
Comprehensive income	139,581	12,826
Mortgage income
Non-interest income
Non-interest income	11,849	9,595
Service charges on deposit accounts
Non-interest income
Non-interest income	12,810	12,908
Title income
Non-interest income
Non-interest income	5,225	5,027
Broker commissions
Non-interest income
Non-interest income	1,953	2,221
ATM and debit card fee income
Non-interest income
Non-interest income	2,582	2,633
Credit card and merchant-related income
Non-interest income
Non-interest income	3,411	2,907
Trust department income
Non-interest income
Non-interest income	4,167	3,426
Commission Income [Member]
Non-interest income
Non-interest income	$ 4,664	$ 1,537