Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
ASSETS
Cash and due from banks	$ 98,940	$ 91,364
Interest-earning deposits with banks	270,873	202,925
Total cash and cash equivalents	369,813	294,289
Securities available for sale at fair value (amortized cost of $956,636 and $987,560, respectively)	997,763	1,028,110
Federal Home Loan Bank stock at cost	22,215	22,215
Loans held for sale	2,088	2,148
Loans, net	2,847,759	2,827,259
FDIC loss sharing asset	140,003	175,071
Interest receivable	15,560	15,287
Premises and equipment, net	116,400	107,899
Other real estate owned ($19,079 and $28,126 covered by FDIC loss share, respectively)	33,004	51,019
Goodwill	115,554	115,554
Core deposit intangible, net	17,896	20,166
Other assets	111,358	126,928
Total Assets	4,789,413	4,785,945
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing	1,159,462	1,156,610
Interest-bearing	2,671,355	2,658,919
Total deposits	3,830,817	3,815,529
Federal Home Loan Bank advances	113,145	119,009
Securities sold under agreements to repurchase	25,000	25,000
Other liabilities	61,739	67,069
Total liabilities	4,030,701	4,026,607
Commitments and contingent liabilities
Shareholders' equity:
Authorized shares	63,033	63,033
Common Stock Shares Issued And Outstanding	39,655	39,506
Common Stock (no par value)	580,358	579,136
Retained earnings	152,519	155,069
Accumulated other comprehensive income	25,835	25,133
Total shareholders' equity	758,712	759,338
Total Liabilities and Shareholders' Equity	4,789,413	4,785,945
Noncovered Loans [Member]
ASSETS
Loans held for sale	2,088	2,148
Loans, excluding covered loans, net of unearned income of ($11,666) and ($16,217), respectively	2,436,961	2,348,371
Less: allowance for loan and lease losses	52,196	53,041
Loans, net	2,384,765	2,295,330
Other real estate owned ($19,079 and $28,126 covered by FDIC loss share, respectively)	13,925	22,893
Covered Loans [Member]
ASSETS
Less: allowance for loan and lease losses	31,784	4,944
Loans, net	462,994	531,929
Other real estate owned ($19,079 and $28,126 covered by FDIC loss share, respectively)	$ 19,079	$ 28,126