Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 216,104	$ 183,921
Interest-bearing deposits with banks	1,541,771	1,666,540
Federal funds sold	700	700
Securities (fair value: $470,006 and $469,871, respectively)	469,995	469,833
Loans held for sale	6,173	9,318
Loans (net of unearned interest)	4,721,995	4,400,232
Allowance for loan losses	(51,666)	(48,693)
Loans, net of allowance for loan losses	4,670,329	4,351,539
Premises and equipment, net	134,088	126,771
Other real estate owned	4,136	3,526
Intangible assets, net	11,082	13,330
Goodwill	54,042	54,042
Accrued interest receivable and other assets	144,736	139,432
Total assets	7,253,156	7,018,952
Deposits:
Noninterest-bearing	2,550,150	2,526,842
Interest-bearing	3,864,895	3,721,215
Total deposits	6,415,045	6,248,057
Short-term borrowings	900	500
Accrued interest payable and other liabilities	29,623	27,342
Junior subordinated debentures	31,959	31,959
Total liabilities	6,477,527	6,307,858
Commitments and contingent liabilities (Note 19)
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 31,894,563 and 31,621,870, respectively	31,895	31,622
Capital surplus	107,481	101,730
Retained earnings	638,580	577,648
Accumulated other comprehensive (loss) income, net of income tax of $(795) and $59, respectively	(2,327)	94
Total stockholders' equity	775,629	711,094
Total liabilities and stockholders' equity	7,253,156	7,018,952
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value