Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets
Cash and due from banks (noninterest-bearing)	$ 237,497	$ 345,761
Federal funds sold and securities purchased under reverse repurchase agreements	4,013	7,253
Securities available for sale (at fair value)	2,363,895	2,194,154
Securities held to maturity (fair value: $1,170,213-2014; $1,150,833-2013)	1,169,640	1,168,728
Loans held for sale (LHFS)	135,562	149,169
Loans held for investment (LHFI)	6,333,651	5,798,881
Less allowance for loan losses, LHFI	70,134	66,448
Net LHFI	6,263,517	5,732,433
Acquired loans:
Noncovered loans	564,542	769,990
Covered loans	27,607	34,216
Less allowance for loan losses, acquired loans	11,949	9,636
Net acquired loans	580,200	794,570
Net LHFI and acquired loans	6,843,717	6,527,003
Premises and equipment, net	200,474	207,283
Mortgage servicing rights	67,090	67,834
Goodwill	365,500	372,851
Identifiable intangible assets	35,357	41,990
Other real estate, excluding covered other real estate	97,037	106,539
Covered other real estate	4,146	5,108
FDIC indemnification asset	8,154	14,347
Other assets	564,234	582,363
Total Assets	12,096,316	11,790,383
Deposits:
Noninterest-bearing	2,723,480	2,663,503
Interest-bearing	6,789,745	7,196,399
Total deposits	9,513,225	9,859,902
Federal funds purchased and securities sold under repurchase agreements	607,851	251,587
Short-term borrowings	316,666	66,385
Long-term FHLB advances	8,003	8,458
Subordinated notes	49,928	49,904
Junior subordinated debt securities	61,856	61,856
Other liabilities	123,689	137,338
Total Liabilities	10,681,218	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	354,251	349,680
Retained earnings	1,081,161	1,034,966
Accumulated other comprehensive loss, net of tax	(34,365)	(43,731)
Total Shareholders' Equity	1,415,098	1,354,953
Total Liabilities and Shareholders' Equity	$ 12,096,316	$ 11,790,383