Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets
Cash and due from banks (noninterest-bearing)	$ 322,960	$ 345,761
Federal funds sold and securities purchased under reverse repurchase agreements	5,000	7,253
Securities available for sale (at fair value)	2,376,431	2,194,154
Securities held to maturity (fair value: $1,162,871-2014; $1,150,833-2013)	1,156,790	1,168,728
Loans held for sale (LHFS)	142,103	149,169
Loans held for investment (LHFI)	6,187,000	5,798,881
Less allowance for loan losses, LHFI	66,648	66,448
Net LHFI	6,120,352	5,732,433
Acquired loans:
Noncovered loans	616,911	769,990
Covered loans	29,628	34,216
Less allowance for loan losses, acquired loans	11,179	9,636
Net acquired loans	635,360	794,570
Net LHFI and acquired loans	6,755,712	6,527,003
Premises and equipment, net	201,639	207,283
Mortgage servicing rights	65,049	67,834
Goodwill	365,500	372,851
Identifiable intangible assets	37,506	41,990
Other real estate, excluding covered other real estate	106,970	106,539
Covered other real estate	3,872	5,108
FDIC indemnification asset	10,866	14,347
Other assets	569,598	582,363
Total Assets	12,119,996	11,790,383
Deposits:
Noninterest-bearing	2,729,199	2,663,503
Interest-bearing	7,131,167	7,196,399
Total deposits	9,860,366	9,859,902
Federal funds purchased and securities sold under repurchase agreements	559,316	251,587
Short-term borrowings	61,227	66,385
Long-term FHLB advances	8,236	8,458
Subordinated notes	49,920	49,904
Junior subordinated debt securities	61,856	61,856
Other liabilities	119,184	137,338
Total Liabilities	10,720,105	10,435,430
Shareholders' Equity
Common stock, no par value: Authorized: 250,000,000 shares Issued and outstanding: 67,439,788 shares - 2014; 67,372,980 shares - 2013	14,051	14,038
Capital surplus	353,196	349,680
Retained earnings	1,063,201	1,034,966
Accumulated other comprehensive loss, net of tax	(30,557)	(43,731)
Total Shareholders' Equity	1,399,891	1,354,953
Total Liabilities and Shareholders' Equity	$ 12,119,996	$ 11,790,383