Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 188,483	$ 216,104
Interest-bearing deposits with banks	1,579,577	1,541,771
Federal funds sold	22,798	700
Securities (fair value: $462,880 and $470,006, respectively)	462,871	469,995
Loans held for sale	9,553	6,173
Loans (net of unearned interest)	5,007,518	4,721,995
Allowance for loan losses	(52,200)	(51,666)
Loans, net of allowance for loan losses	4,955,318	4,670,329
Premises and equipment, net	146,710	134,088
Other real estate owned	3,616	4,136
Intangible assets, net	18,012	11,082
Goodwill	79,733	54,042
Accrued interest receivable and other assets	156,292	144,736
Total assets	7,622,963	7,253,156
Deposits:
Noninterest-bearing	2,661,316	2,550,150
Interest-bearing	4,030,858	3,864,895
Total deposits	6,692,174	6,415,045
Short-term borrowings	2,500	900
Accrued interest payable and other liabilities	34,318	29,623
Junior subordinated debentures	31,959	31,959
Total liabilities	6,760,951	6,477,527
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 32,731,215 and 31,894,563, respectively	32,731	31,895
Capital surplus	148,494	107,481
Retained earnings	684,425	638,580
Accumulated other comprehensive loss, net of income tax of $(1,243) and $(795), respectively	(3,638)	(2,327)
Total stockholders' equity	862,012	775,629
Total liabilities and stockholders' equity	7,622,963	7,253,156
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value