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FAIR VALUE DISCLOSURES (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2010
Dec. 31, 2011
Dec. 31, 2010
Mortgage Servicing Rights [Member]
     
Changes in fair value of net assets (liabilities) classified as Level 3 [Roll Forward]      
Beginning Balance $ 35,560 $ 38,642 $ 35,560
Year to date net gains (losses) included in:      
Net (loss) income   (8,468) 3,082
Other comprehensive income   0 0
Purchases, sales, issuances and settlements, net   0 0
Transfers in and/or out of Level 3   0 0
Ending Balance   30,174 38,642
Net unrealized (losses) gains included in net income for the quarter relating to assets and liabilities held (4,029) (13,966)  
Derivative Instruments, Net [Member]
     
Changes in fair value of net assets (liabilities) classified as Level 3 [Roll Forward]      
Beginning Balance 844 2,685 844
Year to date net gains (losses) included in:      
Net (loss) income   (2,343) 1,841
Other comprehensive income   0 0
Purchases, sales, issuances and settlements, net   0 0
Transfers in and/or out of Level 3   0 0
Ending Balance   342 2,685
Net unrealized (losses) gains included in net income for the quarter relating to assets and liabilities held 1,841 (2,343)  
Available-for-sale Securities [Member]
     
Changes in fair value of net assets (liabilities) classified as Level 3 [Roll Forward]      
Beginning Balance 2,125 0 2,125
Year to date net gains (losses) included in:      
Net (loss) income   0 (2,125)
Other comprehensive income   0 0
Purchases, sales, issuances and settlements, net   0 0
Transfers in and/or out of Level 3   0 0
Ending Balance   0 0
Net unrealized (losses) gains included in net income for the quarter relating to assets and liabilities held (2,375) 0  
Carrying Value [Member]
     
Assets:      
Loans held for sale   83,458 93,697
Assets:      
Cash and due from banks   195,681 99,916
Interest bearing deposits with other banks   303,663 172,170
Held-to-maturity securities   0 1,613,019
Available-for-sale securities   2,513,518 1,096,062
Federal funds sold and securities purchased under agreement to resell   0 150,000
Net loans and leases   8,675,193 9,136,194
Loans held for sale   83,458 93,697
Liabilities:      
Noninterest bearing deposits   2,269,799 2,060,145
Savings and interest bearing deposits   5,698,527 5,794,552
Other time deposits   2,986,863 3,635,324
Federal funds purchased and securities sold under agreement to repurchase and other short-term borrowings   375,433 443,320
Long-term debt and other borrowings   193,880 270,392
Derivative instruments:      
Forward commitments to sell fixed rate mortgage loans   (1,057) 2,499
Commitments to fund fixed rate mortgage loans   2,140 639
Interest rate swap position to receive   53,608 38,347
Interest rate swap position to pay   (54,349) (38,800)
Fair Value [Member]
     
Assets:      
Loans held for sale   83,503 94,001
Assets:      
Cash and due from banks   195,681 99,916
Interest bearing deposits with other banks   303,663 172,170
Held-to-maturity securities   0 1,632,691
Available-for-sale securities   2,513,518 1,096,062
Federal funds sold and securities purchased under agreement to resell   0 150,000
Net loans and leases   8,730,819 9,187,064
Loans held for sale   83,503 94,001
Liabilities:      
Noninterest bearing deposits   2,269,799 2,060,145
Savings and interest bearing deposits   5,698,527 5,794,552
Other time deposits   3,029,147 3,677,796
Federal funds purchased and securities sold under agreement to repurchase and other short-term borrowings   375,285 443,081
Long-term debt and other borrowings   200,166 286,993
Derivative instruments:      
Forward commitments to sell fixed rate mortgage loans   (1,057) 2,499
Commitments to fund fixed rate mortgage loans   2,140 639
Interest rate swap position to receive   53,608 38,347
Interest rate swap position to pay   (54,349) (38,800)
Fair Value, Measurements, Recurring [Member]
     
Available-for-sale securities:      
U.S. Government agencies   1,501,243 433,158
Government agency issued residential mortgage-backed securities   404,610 503,229
Government agency issued commercial mortgage-backed securities   34,599 29,994
Obligations of states and political subdivisions   563,520 110,165
Collateralized debt obligations   0 0
Other   9,546 19,516
Mortgage servicing rights   30,174 38,642
Derivative instruments   55,749 41,882
Assets:      
Total   2,599,411 1,176,586
Liabilities:      
Derivative instruments   55,407 39,197
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
     
Available-for-sale securities:      
U.S. Government agencies   0 0
Government agency issued residential mortgage-backed securities   0 0
Government agency issued commercial mortgage-backed securities   0 0
Obligations of states and political subdivisions   0 0
Collateralized debt obligations   0 0
Other   561 527
Mortgage servicing rights   0 0
Derivative instruments   0 0
Assets:      
Total   561 527
Liabilities:      
Derivative instruments   0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
     
Available-for-sale securities:      
U.S. Government agencies   1,501,243 433,158
Government agency issued residential mortgage-backed securities   404,610 503,229
Government agency issued commercial mortgage-backed securities   34,599 29,994
Obligations of states and political subdivisions   563,520 110,165
Collateralized debt obligations   0 0
Other   8,985 18,989
Mortgage servicing rights   0 0
Derivative instruments   0 0
Assets:      
Total   2,512,957 1,095,535
Liabilities:      
Derivative instruments   0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
     
Available-for-sale securities:      
U.S. Government agencies   0 0
Government agency issued residential mortgage-backed securities   0 0
Government agency issued commercial mortgage-backed securities   0 0
Obligations of states and political subdivisions   0 0
Collateralized debt obligations   0 0
Other   0 0
Mortgage servicing rights   30,174 38,642
Derivative instruments   55,749 41,882
Assets:      
Total   85,923 80,524
Liabilities:      
Derivative instruments   55,407 39,197
Fair Value, Measurements, Nonrecurring [Member]
     
Assets:      
Loans held for sale   83,458 93,697
Impaired loans   234,923 273,405
Other real estate owned   173,805 133,412
Assets:      
Loans held for sale   83,458 93,697
Fair Value, Measurements, Nonrecurring [Member] | Total Losses [Member]
     
Assets:      
Loans held for sale   0 0
Impaired loans   (39,708) (40,719)
Other real estate owned   (21,641) (9,791)
Assets:      
Loans held for sale   0 0
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
     
Assets:      
Loans held for sale   0 0
Impaired loans   0 0
Other real estate owned   0 0
Assets:      
Loans held for sale   0 0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
     
Assets:      
Loans held for sale   83,458 93,697
Impaired loans   0 0
Other real estate owned   0 0
Assets:      
Loans held for sale   83,458 93,697
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
     
Assets:      
Loans held for sale   0 0
Impaired loans   234,923 273,405
Other real estate owned   173,805 133,412
Assets:      
Loans held for sale   $ 0 $ 0