Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Cash and cash equivalents:
Cash and due from banks	$ 320,701	$ 229,901
Interest-bearing deposits with banks	76,846	7,456
Federal funds sold and securities purchased under agreements to resell	298,247	180,512
Total cash and cash equivalents	695,794	417,869
Investment securities:
Securities held to maturity (fair value of $9,723 and $10,233, respectively)	9,314	9,659
Securities available for sale, at fair value	1,009,541	806,766
Other investments	8,893	10,518
Total investment securities	1,027,748	826,943
Loans held for sale	41,649	61,934
Loans:
Loans, net	5,970,044	5,680,688
FDIC indemnification asset	4,401	22,161
Other real estate owned (covered of $5,751 and $16,227, respectively; non-covered of $24,803 and $26,499, respectively)	30,554	42,726
Premises and equipment, net	174,537	171,772
Bank owned life insurance	101,588	99,140
Deferred tax assets	37,827	42,692
Mortgage servicing rights	26,202	21,601
Core deposit and other intangibles	47,425	49,239
Goodwill	338,340	317,688
Other assets	61,239	71,774
Total assets	8,557,348	7,826,227
Deposits:
Noninterest-bearing	1,976,480	1,639,953
Interest-bearing	5,123,948	4,821,092
Total deposits	7,100,428	6,461,045
Federal funds purchased and securities sold under agreements to repurchase	288,231	221,541
Other borrowings	55,158	101,210
Other liabilities	54,147	57,511
Total liabilities	7,497,964	6,841,307
Shareholders' equity:
Common stock - $2.50 par value; authorized 40,000,000 shares; 24,162,657 and 24,150,702 shares issued and outstanding, respectively	60,407	60,377
Surplus	703,929	701,764
Retained earnings	298,919	223,156
Accumulated other comprehensive loss	(3,871)	(377)
Total shareholders' equity	1,059,384	984,920
Total liabilities and shareholders' equity	8,557,348	7,826,227
Acquired non-credit impaired loans
Loans:
Loans, net	1,049,538	1,327,999
Acquired credit impaired loans
Loans:
Loans, net	733,870	919,402
Non-acquired loans
Loans:
Loans, gross	4,220,726	3,467,826
Less allowance for non-acquired loan losses	$ (34,090)	$ (34,539)