Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 185,009	$ 216,104
Interest-bearing deposits with banks	1,607,157	1,541,771
Federal funds sold	600	700
Securities held for investment (fair value: $1,447 and $2,303, respectively)	1,440	2,292
Securities available for sale at fair value	475,640	467,703
Loans held for sale	4,739	6,173
Loans (net of unearned interest)	4,947,528	4,721,995
Allowance for loan losses	(51,875)	(51,666)
Loans, net of allowance for loan losses	4,895,653	4,670,329
Premises and equipment, net	170,167	134,088
Other real estate owned	6,827	4,136
Intangible assets, net	17,257	11,082
Goodwill	79,733	54,042
Accrued interest receivable and other assets	158,216	144,736
Total assets	7,602,438	7,253,156
Deposits:
Noninterest-bearing	2,662,304	2,550,150
Interest-bearing	3,980,827	3,864,895
Total deposits	6,643,131	6,415,045
Short-term borrowings	2,200	900
Accrued interest payable and other liabilities	40,347	29,623
Junior subordinated debentures	31,959	31,959
Total liabilities	6,717,637	6,477,527
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 32,749,690 and 31,894,563, respectively	32,750	31,895
Capital surplus	149,242	107,481
Retained earnings	707,481	638,580
Accumulated other comprehensive loss, net of income tax of $(1,597) and $(795), respectively	(4,672)	(2,327)
Total stockholders' equity	884,801	775,629
Total liabilities and stockholders' equity	7,602,438	7,253,156
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value