Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Cash and cash equivalents:
Cash and due from banks	$ 201,966	$ 178,664
Interest-bearing deposits with banks	36,241	218,883
Federal funds sold and securities purchased under agreements to resell	136,241	298,247
Total cash and cash equivalents	374,448	695,794
Investment securities:
Securities held to maturity (fair value of $6,250 and $9,723, respectively)	6,094	9,314
Securities available for sale, at fair value	999,405	1,009,541
Other investments	9,482	8,893
Total investment securities	1,014,981	1,027,748
Loans held for sale	50,572	41,649
Loans:
Loans, net	6,643,326	5,970,044
FDIC indemnification asset		4,401
Other real estate owned (covered of $0 and $5,751, respectively; non-covered of $18,316 and $24,803, respectively)	18,316	30,554
Premises and equipment, net	183,510	174,537
Bank owned life insurance	104,148	101,588
Deferred tax assets	31,123	37,827
Mortgage servicing rights	29,037	26,202
Core deposit and other intangibles	39,848	47,425
Goodwill	338,340	338,340
Other assets	72,943	61,239
Total assets	8,900,592	8,557,348
Deposits:
Noninterest-bearing	2,199,046	1,976,480
Interest-bearing	5,135,377	5,123,948
Total deposits	7,334,423	7,100,428
Federal funds purchased and securities sold under agreements to repurchase	313,773	288,231
Other borrowings	55,358	55,158
Other liabilities	62,450	54,147
Total liabilities	7,766,004	7,497,964
Shareholders' equity:
Preferred stock - $.01 par value; authorized 10,000,000 shares; no shares issued and outstanding
Common stock - $2.50 par value; authorized 40,000,000 shares; 24,230,392 and 24,162,657 shares issued and outstanding, respectively	60,576	60,407
Surplus	711,307	703,929
Retained earnings	370,916	298,919
Accumulated other comprehensive income (loss)	(8,211)	(3,871)
Total shareholders' equity	1,134,588	1,059,384
Total liabilities and shareholders' equity	8,900,592	8,557,348
Acquired credit impaired loans
Loans:
Loans, net	602,546	733,870
Loans, net	602,546	635,411
Non-acquired loans
Loans:
Loans, net	5,241,041	4,220,726
Total loans	5,241,041	4,220,726
Less allowance for non-acquired loan losses	(36,960)	(34,090)
Loans, net	5,204,081	4,186,636
Acquired non-credit impaired loans
Loans:
Loans, net	836,699	1,049,538
Total loans	836,699	1,049,538
Loans, net	$ 836,699	$ 1,041,491