CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 208,702	$ 219,243
Interest bearing deposits with other banks and other short-term investments	240,426	118,660
Cash and cash equivalents	449,128	337,903
Time deposits in other financial institutions	3,138	3,129
Securities:
Carried at fair value (cost of $6,463,683 at June 30, 2021, and $6,024,225 at December 31, 2020)	6,543,978	6,127,975
Held to maturity, net of allowance for credit losses of $51 at June 30, 2021, and $51 at December 31, 2020 (fair value of $95,421 at June 30, 2021, and $100,041 at December 31, 2020)	85,439	88,839
Other investments, at cost	76,809	75,253
Loans held for sale	33,248	57,949
Loans receivable:
Held to maturity	10,012,014	10,023,051
Allowance for credit losses	(120,726)	(131,606)
Loans receivable, net	9,891,288	9,891,445
Premises, furniture and equipment, net	219,433	219,595
Premises, furniture and equipment held for sale	6,925	6,499
Other real estate, net	6,314	6,624
Goodwill	576,005	576,005
Core deposit intangibles and customer relationship intangibles, net	37,452	42,383
Servicing rights, net	6,201	6,052
Cash surrender value on life insurance	189,619	187,664
Other assets	246,029	281,024
TOTAL ASSETS	18,371,006	17,908,339
Deposits:
Demand	6,299,289	5,688,810
Savings	8,189,223	8,019,704
Time	1,126,606	1,271,391
Total deposits	15,615,118	14,979,905
Short-term borrowings	152,563	167,872
Other borrowings	271,244	457,042
Accrued expenses and other liabilities	172,295	224,289
TOTAL LIABILITIES	16,211,220	15,829,108
STOCKHOLDERS' EQUITY:
Common stock (par value $1 per share; 60,000,000 shares authorized at both June 30, 2021, and December 31, 2020; issued 42,245,452 shares at June 30, 2021, and 42,093,862 shares at December 31, 2020)	42,245	42,094
Capital surplus	1,066,765	1,062,083
Retained earnings	883,484	791,630
Accumulated other comprehensive income	56,587	72,719
TOTAL STOCKHOLDERS' EQUITY	2,159,786	2,079,231
TOTAL LIABILITIES AND EQUITY	18,371,006	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