Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks	$ 212,826	$ 259,049
Interest-bearing deposits with banks	2,623,565	2,909,861
Federal funds sold	1,084	2,850
Debt securities held for investment (fair value: $2,321 and $2,383, respectively)	2,320	2,383
Debt securities available for sale at fair value	1,615,913	1,538,221
Loans held for sale	6,223	6,232
Loans held for investment (net of unearned interest)	7,118,608	6,943,563
Allowance for credit losses	(94,760)	(92,728)
Loans, net of allowance for credit losses	7,023,848	6,850,835
Premises and equipment, net	279,461	278,088
Other real estate owned	38,587	36,756
Intangible assets, net	19,103	19,983
Goodwill	182,055	182,055
Accrued interest receivable and other assets	327,120	301,550
Total assets	12,332,105	12,387,863
Deposits:
Noninterest-bearing	4,540,363	4,944,730
Interest-bearing	6,069,740	6,029,498
Total deposits	10,610,103	10,974,228
Short-term borrowings	203,494	300
Accrued interest payable and other liabilities	121,568	76,455
Subordinated debt	86,058	86,044
Total liabilities	11,021,223	11,137,027
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 32,899,493 and 32,875,560, respectively	32,900	32,876
Capital surplus	170,231	169,231
Retained earnings	1,164,665	1,120,292
Accumulated other comprehensive loss, net of tax benefit of $17,603 and $22,107, respectively	(56,914)	(71,563)
Total stockholders' equity	1,310,882	1,250,836
Total liabilities and stockholders' equity	12,332,105	12,387,863
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value