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Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Assets    
Cash and due from banks $ 154,330 $ 268,208
Money market and other interest-earning investments 303,447 321,504
Total cash and cash equivalents 457,777 589,712
Equity securities, at fair value 2,429 2,547
Investment securities - available-for-sale, at fair value:    
Total investment securities - available-for-sale 6,724,530 5,970,115
Federal Home Loan Bank/Federal Reserve Bank stock, at cost 169,417 169,433
Loans held for sale, at fair value 50,281 63,250
Loans:    
Total loans 13,925,261 13,786,479
Allowance for credit losses (114,037) (131,388)
Net loans 13,811,224 13,655,091
Premises and equipment, net 466,559 464,408
Operating lease right-of-use assets 74,611 76,197
Accrued interest receivable 80,841 85,306
Goodwill 1,036,994 1,036,994
Other intangible assets 42,939 46,014
Company-owned life insurance 456,782 456,110
Other assets 370,067 345,445
Total assets 23,744,451 22,960,622
Deposits:    
Noninterest-bearing demand 6,091,054 5,633,672
Interest-bearing:    
Checking and NOW 4,958,791 4,977,046
Savings 3,631,145 3,395,747
Money market 2,125,862 1,908,118
Time deposits 1,042,903 1,122,870
Total deposits 17,849,755 17,037,453
Federal funds purchased and interbank borrowings 922 1,166
Securities sold under agreements to repurchase 395,242 431,166
Federal Home Loan Bank advances 1,912,541 1,991,435
Other borrowings 266,282 252,787
Operating lease liabilities 84,665 86,598
Accrued expenses and other liabilities 255,597 187,361
Total liabilities 20,765,004 19,987,966
Shareholders' Equity    
Preferred stock, 2,000 shares authorized, no shares issued or outstanding 0 0
Common stock, $1.00 per share stated value, 300,000 shares authorized,    165,676 and 165,367 shares issued and outstanding, respectively 165,676 165,367
Capital surplus 1,874,572 1,875,626
Retained earnings 847,290 783,892
Accumulated other comprehensive income (loss), net of tax 91,909 147,771
Total shareholders' equity 2,979,447 2,972,656
Total liabilities and shareholders' equity 23,744,451 22,960,622
Commercial    
Loans:    
Total loans 4,068,896 3,956,422
Allowance for credit losses (25,130) (30,567)
Commercial real estate    
Loans:    
Total loans 6,074,135 5,946,512
Allowance for credit losses (70,561) (75,810)
Residential real estate    
Loans:    
Total loans 2,203,277 2,248,422
Allowance for credit losses (10,265) (12,608)
Consumer credit    
Loans:    
Total loans 1,578,953 1,635,123
U.S. Treasury    
Investment securities - available-for-sale, at fair value:    
Total investment securities - available-for-sale 228,890 10,208
U.S. government-sponsored entities and agencies    
Investment securities - available-for-sale, at fair value:    
Total investment securities - available-for-sale 1,373,533 841,988
Mortgage-backed securities    
Investment securities - available-for-sale, at fair value:    
Total investment securities - available-for-sale 3,385,339 3,339,098
States and political subdivisions    
Investment securities - available-for-sale, at fair value:    
Total investment securities - available-for-sale 1,467,804 1,492,162
Other securities    
Investment securities - available-for-sale, at fair value:    
Total investment securities - available-for-sale $ 268,964 $ 286,659