Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 280,518	$ 222,043
Interest-bearing deposits with banks	1,336,394	1,646,238
Federal funds sold		1,000
Debt securities held for investment (fair value: $2,984 and $1,903, respectively)	2,964	1,903
Debt securities available for sale at fair value	552,232	489,723
Loans held for sale	53,719	11,001
Loans (net of unearned interest)	6,394,506	5,662,143
Allowance for credit losses	(91,366)	(54,238)
Loans, net of allowance for credit losses	6,303,140	5,607,905
Premises and equipment, net	261,677	206,275
Other real estate owned	32,179	5,607
Intangible assets, net	18,999	22,608
Goodwill	149,922	148,604
Accrued interest receivable and other assets	220,613	202,851
Total assets	9,212,357	8,565,758
Deposits:
Noninterest-bearing	3,790,900	2,956,370
Interest-bearing	4,273,804	4,527,265
Total deposits	8,064,704	7,483,635
Short-term borrowings	1,100	1,100
Accrued interest payable and other liabilities	51,864	49,230
Junior subordinated debentures	26,804	26,804
Total liabilities	8,144,472	7,560,769
Commitments and contingent liabilities (Note 19)
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 32,719,852 and 32,694,268, respectively	32,720	32,694
Capital surplus	156,574	153,353
Retained earnings	871,161	815,488
Accumulated other comprehensive income, net of income tax of $2,513 and $1,187, respectively	7,430	3,454
Total stockholders' equity	1,067,885	1,004,989
Total liabilities and stockholders' equity	9,212,357	8,565,758
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value