Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 228,819	$ 280,518
Interest-bearing deposits with banks	1,821,203	1,336,394
Federal funds sold	800	0
Debt securities held for investment (fair value: $2,978 and $2,984, respectively)	2,977	2,964
Debt securities available for sale	531,523	552,232
Loans held for sale	24,776	53,719
Loans held for investment (net of unearned interest)	6,169,442	6,394,506
Allowance for credit losses	(83,936)	(91,366)
Loans, net of allowance for credit losses	6,085,506	6,303,140
Premises and equipment, net	269,047	261,677
Other real estate owned	39,475	32,179
Intangible assets, net	17,566	18,999
Goodwill	149,922	149,922
Accrued interest receivable and other assets	233,998	220,613
Total assets	9,405,612	9,212,357
Deposits:
Noninterest-bearing	3,775,387	3,790,900
Interest-bearing	4,316,527	4,273,804
Total deposits	8,091,914	8,064,704
Short-term borrowings	0	1,100
Accrued interest payable and other liabilities	55,977	51,864
Subordinated debt	85,987	26,804
Total liabilities	8,233,878	8,144,472
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 32,603,118 and 32,719,852, respectively	32,603	32,720
Capital surplus	159,914	156,574
Retained earnings	977,067	871,161
Accumulated other comprehensive income, net of income tax of $684 and $2,513, respectively	2,150	7,430
Total stockholders' equity	1,171,734	1,067,885
Total liabilities and stockholders' equity	9,405,612	9,212,357
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value