Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Cash and due from banks	$ 432,104	$ 383,372
Interest-bearing bank deposits	109,961	110,579
Federal funds sold	268	515
Securities available for sale, at fair value (amortized cost of $4,637,610 and $2,755,806)	4,675,304	2,691,037
Securities held to maturity (fair value of $1,611,004 and $2,935,856)	1,568,009	2,979,547
Loans held for sale	55,864	28,150
Loans	21,212,755	20,026,411
Less: allowance for loan losses	(191,251)	(194,514)
Loans, net	21,021,504	19,831,897
Property and equipment, net of accumulated depreciation of $249,527 and $225,969	380,209	353,668
Right of use assets, net of accumulated amortization of $12,194	110,023
Prepaid expense	40,178	35,047
Other real estate and foreclosed assets, net	30,405	26,270
Accrued interest receivable	92,037	86,681
Goodwill	855,453	790,972
Other intangible assets, net	106,807	96,151
Life insurance contracts	608,063	549,300
Deferred tax asset, net		22,967
Funded pension assets, net	185,791	65,125
Other assets	328,777	184,629
Total assets	30,600,757	28,235,907
Deposits:
Noninterest-bearing	8,775,632	8,499,027
Interest-bearing	15,027,943	14,651,158
Total deposits	23,803,575	23,150,185
Short-term borrowings	2,714,872	1,589,128
Long-term debt	233,462	224,993
Accrued interest payable	10,200	12,267
Lease liabilities	127,703
Deferred tax liability, net	37,721
Other liabilities	205,539	177,994
Total liabilities	27,133,072	25,154,567
Stockholders' equity:
Common stock	309,513	292,716
Capital surplus	1,736,664	1,725,741
Retained earnings	1,476,232	1,243,592
Accumulated other comprehensive loss, net	(54,724)	(180,709)
Total stockholders' equity	3,467,685	3,081,340
Total liabilities and stockholders' equity	$ 30,600,757	$ 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	92,947,000	87,903,000
Common shares outstanding	87,515,000	85,643,000