Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
ASSETS
Cash and due from banks	$ 98,979	$ 91,364
Interest-earning deposits with banks	463,613	202,925
Total cash and cash equivalents	562,592	294,289
Securities available for sale at fair value (amortized cost of $898,434 and $987,560, respectively)	943,624	1,028,110
Federal Home Loan Bank stock at cost	22,017	22,215
Loans held for sale	3,600	2,148
Loans, net	2,854,603	2,827,259
FDIC loss sharing asset	111,677	175,071
Interest receivable	16,587	15,287
Premises and equipment, net	115,506	107,899
Other real estate owned ($16,511 and $28,126 covered by FDIC loss share, respectively)	27,386	51,019
Goodwill	115,554	115,554
Core deposit intangible, net	16,803	20,166
Other assets	113,100	126,928
Total Assets	4,903,049	4,785,945
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing	1,270,321	1,156,610
Interest-bearing	2,668,534	2,658,919
Total deposits	3,938,855	3,815,529
Federal Home Loan Bank advances	113,080	119,009
Securities sold under agreements to repurchase	25,000	25,000
Other liabilities	64,137	67,069
Total liabilities	4,141,072	4,026,607
Commitments and contingent liabilities
Shareholders' equity:
Authorized shares	63,033	63,033
Common Stock Shares Issued And Outstanding	39,689	39,506
Common Stock (no par value)	581,001	579,136
Retained earnings	152,498	155,069
Accumulated other comprehensive income	28,478	25,133
Total shareholders' equity	761,977	759,338
Total Liabilities and Shareholders' Equity	4,903,049	4,785,945
Noncovered Loans [Member]
ASSETS
Loans held for sale	3,600	2,148
Loans, excluding covered loans, net of unearned income of ($11,523) and ($16,217), respectively	2,476,844	2,348,371
Loans and Leases Receivable, Allowance	51,527	53,041
Loans, net	2,425,317	2,295,330
Other real estate owned ($16,511 and $28,126 covered by FDIC loss share, respectively)	10,875	22,893
Covered Loans [Member]
ASSETS
Loans and Leases Receivable, Allowance	29,157	4,944
Loans, net	429,286	531,929
Other real estate owned ($16,511 and $28,126 covered by FDIC loss share, respectively)	$ 16,511	$ 28,126