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Fair Value Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Assets    
Total cash and cash equivalents $ 105,199 $ 35,407
FHLB Stock 65,814 72,689
Investment securities available-for-sale 2,259,531 2,201,526
Investment securities held-to-maturity 2,191 2,383
Non-covered loans held-for-sale 2,880 348
Covered loans held-for-sale    5,664
Accrued interest receivable 22,385 23,512
Deposits:    
Noninterest-bearing 2,252,280 2,027,876
Interest-bearing 2,446,570 2,576,672
Junior subordinated debentures 87,631 115,055
Accrued interest payable 3,355 3,526
Level 1 [Member]
    
Assets    
Total cash and cash equivalents 476,695 345,343
Deposits:    
Noninterest-bearing 2,252,280 2,027,876
Level 2 [Member]
    
Assets    
Interest-earning balances due from depository institutions 60,000 60,000
FHLB Stock 65,814 72,689
Investment securities available-for-sale 2,259,531 2,201,526
Accrued interest receivable 22,385 23,512
Swaps 24,663 20,497
Deposits:    
Interest-bearing 2,447,655 2,577,825
Borrowings 967,937 1,012,211
Junior subordinated debentures 88,203 115,854
Accrued interest payable 3,355 3,526
Swaps 24,663 20,497
Level 3 [Member]
    
Assets    
Investment securities held-to-maturity 2,191 2,383
Non-covered loans held-for-sale 2,880 348
Covered loans held-for-sale   5,664
Total Loans, net of allowance for credit losses 3,450,913 3,534,960
Carrying Amount [Member]
    
Assets    
Total cash and cash equivalents 476,695 345,343
Interest-earning balances due from depository institutions 60,000 60,000
FHLB Stock 65,814 72,689
Investment securities available-for-sale 2,259,531 2,201,526
Investment securities held-to-maturity 2,191 2,383
Non-covered loans held-for-sale 2,880 348
Covered loans held-for-sale   5,664
Total Loans, net of allowance for credit losses 3,293,163 3,382,632
Accrued interest receivable 22,385 23,512
Swaps 24,663 20,497
Deposits:    
Noninterest-bearing 2,252,280 2,027,876
Interest-bearing 2,446,570 2,576,672
Borrowings 916,434 958,032
Junior subordinated debentures 87,631 115,055
Accrued interest payable 3,355 3,526
Swaps 24,663 20,497
Estimated Fair Value [Member]
    
Assets    
Total cash and cash equivalents 476,695 345,343
Interest-earning balances due from depository institutions 60,000 60,000
FHLB Stock 65,814 72,689
Investment securities available-for-sale 2,259,531 2,201,526
Investment securities held-to-maturity 2,191 2,383
Non-covered loans held-for-sale 2,880 348
Covered loans held-for-sale   5,664
Total Loans, net of allowance for credit losses 3,450,913 3,534,960
Accrued interest receivable 22,385 23,512
Swaps 24,663 20,497
Deposits:    
Noninterest-bearing 2,252,280 2,027,876
Interest-bearing 2,447,655 2,577,825
Borrowings 967,937 1,012,211
Junior subordinated debentures 88,203 115,854
Accrued interest payable 3,355 3,526
Swaps $ 24,663 $ 20,497