Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 226,062	$ 222,043
Interest-bearing deposits with banks	1,609,462	1,646,238
Federal funds sold		1,000
Securities held for investment (fair value: $3,011 and $1,903, respectively)	2,971	1,903
Securities available for sale at fair value	593,970	489,723
Loans held for sale	48,601	11,001
Loans (net of unearned interest)	6,612,093	5,662,143
Allowance for credit losses	(106,126)	(54,238)
Loans, net of allowance for credit losses	6,505,967	5,607,905
Premises and equipment, net	247,494	206,275
Other real estate owned	4,739	5,607
Intangible assets, net	19,914	22,608
Goodwill	149,922	148,604
Accrued interest receivable and other assets	209,766	202,851
Total assets	9,618,868	8,565,758
Deposits:
Noninterest-bearing	3,759,305	2,956,370
Interest-bearing	4,736,586	4,527,265
Total deposits	8,495,891	7,483,635
Short-term borrowings	300	1,100
Accrued interest payable and other liabilities	52,121	49,230
Junior subordinated debentures	26,804	26,804
Total liabilities	8,575,116	7,560,769
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 32,679,191 and 32,694,268, respectively	32,679	32,694
Capital surplus	155,431	153,353
Retained earnings	846,934	815,488
Accumulated other comprehensive income, net of income tax of $2,943 and $1,187, respectively	8,708	3,454
Total stockholders' equity	1,043,752	1,004,989
Total liabilities and stockholders' equity	9,618,868	8,565,758
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value