Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Cash and due from banks	$ 124,573	$ 91,364
Interest-earning deposits with banks	389,353	202,925
Total cash and cash equivalents	513,926	294,289
Securities available for sale at fair value (amortized cost of $969,359 and $987,560, respectively)	1,001,665	1,028,110
Federal Home Loan Bank stock at cost	21,819	22,215
Loans held for sale	2,563	2,148
Loans, net	2,864,803	2,827,259
FDIC loss sharing asset	96,354	175,071
Interest receivable	14,268	15,287
Premises and equipment, net	118,708	107,899
Other real estate owned ($16,311 and $28,126 covered by FDIC loss share, respectively)	26,987	51,019
Goodwill	115,554	115,554
Core deposit intangible, net	15,721	20,166
Other assets	113,967	126,928
Total Assets	4,906,335	4,785,945
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing	1,321,171	1,156,610
Interest-bearing	2,720,914	2,658,919
Total deposits	4,042,085	3,815,529
Federal Home Loan Bank advances	6,644	119,009
Securities sold under agreements to repurchase	25,000	25,000
Other liabilities	68,598	67,069
Total liabilities	4,142,327	4,026,607
Commitments and contingent liabilities
Shareholders' equity:
Authorized shares	63,033	63,033
Common Stock Shares Issued And Outstanding	39,686	39,506
Common Stock (no par value)	581,471	579,136
Retained earnings	162,388	155,069
Accumulated other comprehensive income	20,149	25,133
Total shareholders' equity	764,008	759,338
Total Liabilities and Shareholders' Equity	4,906,335	4,785,945
Noncovered Loans [Member]
ASSETS
Loans held for sale	2,563	2,148
Loans, excluding covered loans, net of unearned income of ($7,767) and ($16,217), respectively	2,525,710	2,348,371
Loans and Leases Receivable, Allowance	52,244	53,041
Loans, net	2,473,466	2,295,330
Other real estate owned ($16,311 and $28,126 covered by FDIC loss share, respectively)	10,676	22,893
Covered Loans [Member]
ASSETS
Loans and Leases Receivable, Allowance	30,056	4,944
Loans, net	391,337	531,929
Other real estate owned ($16,311 and $28,126 covered by FDIC loss share, respectively)	$ 16,311	$ 28,126