Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest and dividend income
Loans and leases, including fees	$ 271,746	$ 284,879
Mortgage loans held for sale, including fees	1,678	1,054
Taxable securities	23,481	33,916
Tax-exempt securities	1,921	2,209
Other	4,103	4,026
Total interest and dividend income	302,929	326,084
Interest expense
Deposits	63,676	60,235
Short-term borrowings	266	5,716
Long-term debt	8,645	9,649
Total interest expense	72,587	75,600
Net interest income	230,342	250,484
Provision for expected credit losses	68,971	13,763
Net interest income after provision for expected credit losses	161,371	236,721
Non-interest income
Income from bank owned life insurance	1,822	1,797
Other non-interest income	4,451	4,051
Total non-interest income	64,656	52,509
Non-interest expense
Salaries and employee benefits	102,545	98,296
Net occupancy and equipment	19,984	18,564
Communication and delivery	3,677	3,700
Marketing and business development	3,710	4,118
Computer services expense	10,167	9,157
Professional services	5,322	4,450
Credit and other loan-related expense	3,643	2,859
Insurance	4,559	4,186
Travel and entertainment	2,740	2,430
Amortization of acquisition intangibles	4,187	5,009
Impairment of long-lived assets and other losses	3,317	1,064
Other non-interest expense	13,576	4,920
Total non-interest expense	177,427	158,753
Income before income tax expense	48,600	130,477
Income tax expense	12,175	30,346
Net income	36,425	100,131
Less: Preferred stock dividends	3,598	3,598
Net income available to common shareholders	32,827	96,533
Less: Earnings allocated to unvested restricted stock	367	933
Earnings allocated to common shareholders	$ 32,460	$ 95,600
Earnings per common share - Basic (in usd per share)	$ 0.62	$ 1.76
Earnings per common share - Diluted (in usd per share)	0.62	1.75
Cash dividends declared per common share (in usd per share)	$ 0.47	$ 0.43
Comprehensive income
Net income	$ 36,425	$ 100,131
Unrealized gains on securities:
Unrealized holding gains arising during the period (net of tax effects of $17,342 and $10,675, respectively)	56,424	41,408
Unrealized gains on securities, net of tax	56,424	41,408
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 $3,209 and $471, respectively)	10,441	(2,185)
Less: Reclassification adjustment for gains (losses) included in net income (net of tax effects of $136 and $75, respectively)	442	(227)
Fair value of derivative instruments designated as cash flow hedges, net of tax	9,999	(1,958)
Other comprehensive income (loss), net of tax	66,423	39,450
Comprehensive income	102,848	139,581
Mortgage income
Non-interest income
Non-interest income	23,245	11,849
Service charges on deposit accounts
Non-interest income
Non-interest income	12,525	12,810
Title revenue
Non-interest income
Non-interest income	5,936	5,225
Commission income
Non-interest income
Non-interest income	4,191	4,664
Broker commissions
Non-interest income
Non-interest income	2,127	1,953
ATM and debit card fee income
Non-interest income
Non-interest income	2,838	2,582
Credit card and merchant-related income
Non-interest income
Non-interest income	3,295	3,411
Trust department income
Non-interest income
Non-interest income	$ 4,226	$ 4,167