CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 192,247	$ 219,243
Interest bearing deposits with other banks and other short-term investments	135,158	118,660
Cash and cash equivalents	327,405	337,903
Time deposits in other financial institutions	3,138	3,129
Securities:
Carried at fair value (cost of $7,416,143 at September 30, 2021, and $6,024,225 at December 31, 2020)	7,449,936	6,127,975
Held to maturity, net of allowance for credit losses of $0 at September 30, 2021, and $51 at December 31, 2020 (fair value of $95,010 at September 30, 2021, and $100,041 at December 31, 2020)	85,354	88,839
Other investments, at cost	83,332	75,253
Loans held for sale	37,078	57,949
Loans receivable:
Held to maturity	9,854,907	10,023,051
Allowance for credit losses	(117,533)	(131,606)
Loans receivable, net	9,737,374	9,891,445
Premises, furniture and equipment, net	219,297	219,595
Premises, furniture and equipment held for sale	2,699	6,499
Other real estate, net	4,744	6,624
Goodwill	576,005	576,005
Core deposit intangibles and customer relationship intangibles, net	35,157	42,383
Servicing rights, net	6,351	6,052
Cash surrender value on life insurance	190,576	187,664
Other assets	237,779	281,024
TOTAL ASSETS	18,996,225	17,908,339
Deposits:
Demand	6,537,722	5,688,810
Savings	8,416,204	8,019,704
Time	1,068,317	1,271,391
Total deposits	16,022,243	14,979,905
Short-term borrowings	265,620	167,872
Other borrowings	371,765	457,042
Accrued expenses and other liabilities	164,345	224,289
TOTAL LIABILITIES	16,823,973	15,829,108
STOCKHOLDERS' EQUITY:
Common stock (par value $1 per share; 60,000,000 shares authorized at both September 30, 2021, and December 31, 2020; issued 42,250,092 shares at September 30, 2021, and 42,093,862 shares at December 31, 2020)	42,250	42,094
Capital surplus	1,068,913	1,062,083
Retained earnings	926,834	791,630
Accumulated other comprehensive income	23,550	72,719
TOTAL STOCKHOLDERS' EQUITY	2,172,252	2,079,231
TOTAL LIABILITIES AND EQUITY	18,996,225	17,908,339
Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	0	0
Series A Junior Participating preferred stock
STOCKHOLDERS' EQUITY:
Preferred stock	0	0
Series B Fixed Rate Cumulative Perpetual Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	0	0
Series C Senior Non-Cumulative Perpetual Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	0	0
Series D Senior Non-Cumulative Perpetual Convertible Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	0	0
Series E Fixed-Rate Reset Cumulative Perpetual Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	$ 110,705	$ 110,705