Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks	$ 360,194	$ 383,372
Interest-bearing bank deposits	163,232	110,579
Federal funds sold	530	515
Securities available for sale, at fair value (amortized cost of $2,698,865 and $2,755,806)	2,681,080	2,691,037
Securities held to maturity (fair value of $2,892,910 and $2,935,856)	2,896,442	2,979,547
Loans held for sale	27,437	28,150
Loans	20,112,838	20,026,411
Less: allowance for loan losses	(194,688)	(194,514)
Loans, net	19,918,150	19,831,897
Property and equipment, net of accumulated depreciation of $233,078 and $225,969	358,205	353,668
Right of use assets, net of accumulated amortization of $3,064	113,447
Prepaid expenses	39,153	35,047
Other real estate and foreclosed assets, net	27,148	26,270
Accrued interest receivable	94,404	86,681
Goodwill	792,084	790,972
Other intangible assets, net	91,013	96,151
Life insurance contracts	553,893	549,300
Deferred tax asset, net		22,967
Funded pension assets, net	168,910	65,125
Other assets	204,909	184,629
Total assets	28,490,231	28,235,907
Deposits
Noninterest-bearing	8,158,658	8,499,027
Interest-bearing	15,221,636	14,651,158
Total deposits	23,380,294	23,150,185
Short-term borrowings	1,388,735	1,589,128
Long-term debt	224,962	224,993
Accrued interest payable	18,031	12,267
Lease liabilities	128,494
Deferred tax liability, net	19,065
Other liabilities	140,075	177,994
Total liabilities	25,299,656	25,154,567
Stockholders' equity:
Common stock	292,716	292,716
Capital surplus	1,731,148	1,725,741
Retained earnings	1,299,220	1,243,592
Accumulated other comprehensive loss, net	(132,509)	(180,709)
Total stockholders' equity	3,190,575	3,081,340
Total liabilities and stockholders' equity	$ 28,490,231	$ 28,235,907
Preferred shares authorized (par value of $20.00 per share)	50,000,000	50,000,000
Common shares authorized (par value of $3.33 per share)	350,000,000	350,000,000
Common shares issued	87,903,000	87,903,000
Common shares outstanding	85,710,000	85,643,000