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Fair Value Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Assets    
Total cash and cash equivalents $ 94,523 $ 35,407
FHLB Stock 69,222 72,689
Investment securities available-for-sale 2,372,729 2,201,526
Investment securities held-to-maturity 2,280 2,383
Non-covered loans held-for-sale 630 348
Covered loans held-for-sale 3,771 5,664
Accrued interest receivable 23,375 23,512
Deposits:    
Noninterest-bearing 2,120,382 2,027,876
Interest-bearing 2,559,725 2,576,672
Junior subordinated debentures 108,250 115,055
Accrued interest payable 3,417 3,526
Level 1 [Member]
    
Assets    
Total cash and cash equivalents 276,318 345,343
Deposits:    
Noninterest-bearing 2,120,382 2,027,876
Level 2 [Member]
    
Assets    
Interest-earning balances due from depository institutions 60,000 60,000
FHLB Stock 69,222 72,689
Investment securities available-for-sale 2,372,729 2,201,526
Accrued interest receivable 23,375 23,512
Swaps 18,753 20,497
Deposits:    
Interest-bearing 2,560,826 2,577,825
Borrowings 975,702 1,012,211
Junior subordinated debentures 108,972 115,854
Accrued interest payable 3,417 3,526
Swaps 18,753 20,497
Level 3 [Member]
    
Assets    
Investment securities held-to-maturity 2,280 2,383
Non-covered loans held-for-sale 630 348
Covered loans held-for-sale 3,771 5,664
Total Loans, net of allowance for credit losses 3,477,099 3,534,960
Estimated Fair Value [Member]
    
Assets    
Total cash and cash equivalents 276,318 345,343
Interest-earning balances due from depository institutions 60,000 60,000
FHLB Stock 69,222 72,689
Investment securities available-for-sale 2,372,729 2,201,526
Investment securities held-to-maturity 2,280 2,383
Non-covered loans held-for-sale 630 348
Covered loans held-for-sale 3,771 5,664
Total Loans, net of allowance for credit losses 3,477,099 3,534,960
Accrued interest receivable 23,375 23,512
Swaps 18,753 20,497
Deposits:    
Noninterest-bearing 2,120,382 2,027,876
Interest-bearing 2,560,826 2,577,825
Borrowings 975,702 1,012,211
Junior subordinated debentures 108,972 115,854
Accrued interest payable 3,417 3,526
Swaps 18,753 20,497
Carrying Amount [Member]
    
Assets    
Total cash and cash equivalents 276,318  
Interest-earning balances due from depository institutions 60,000 60,000
FHLB Stock 69,222 72,689
Investment securities available-for-sale 2,372,729 2,201,526
Investment securities held-to-maturity 2,280 2,383
Non-covered loans held-for-sale 630 348
Covered loans held-for-sale 3,771 5,664
Total Loans, net of allowance for credit losses 3,336,034 3,382,632
Accrued interest receivable 23,375 23,512
Swaps 18,753 20,497
Deposits:    
Noninterest-bearing 2,120,382 2,027,876
Interest-bearing 2,559,725 2,576,672
Borrowings 926,298 958,032
Junior subordinated debentures 108,250 115,055
Accrued interest payable 3,417 3,526
Swaps $ 18,753 $ 20,497