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Loan and Lease Finance Receivables and Allowance for Credit Losses (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Loans and Lease Finance Receivables (Textual) [Abstract]                
Fixed rate loans held $ 1,510,000,000   $ 1,510,000,000          
Impaired, at carrying value 107,108,000   107,108,000     101,226,000    
Outstanding balance 61,865,000   61,865,000     62,672,000    
Loans classified as troubled debt restructured 77,000,000   77,000,000          
Loans and Lease Finance Receivables (Additional Textual) [Abstract]                
Secure Borrowings from the FHLB and federal reserve bank 2,330,000,000   2,330,000,000     2,310,000,000    
Number of performing loans     28          
Reserve for Credit Risk for Undisbursed Commitments 9,600,000   9,600,000     9,600,000    
Allocation of allowance to troubled debt restructuring 23,000   23,000     27,000    
Amount of impaired loan transferred to nonaccrual status 10,900,000              
Commercial Real Estate Loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Percentage of loan portfolio 63.20%   63.20%          
Outstanding balance 52,000   52,000          
Nonaccrual dairy and livestock loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Outstanding balance 3,400,000   3,400,000          
Non-covered impaired loans modified in troubled debt restructure [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Impaired, at carrying value 77,000,000   77,000,000          
Performing Financing Receivable [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Impaired, at carrying value 107,100,000   107,100,000          
Loans classified as troubled debt restructured 45,200,000   45,200,000          
Nonperforming Financing Receivable [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Loans classified as troubled debt restructured 31,800,000   31,800,000          
Nonaccrual single family mortgage loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Outstanding balance 12,500,000   12,500,000          
Allowance impaired loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Impaired, at carrying value 1,300,000   1,300,000          
Allowance impaired non-covered loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Impaired, at carrying value           3,000,000    
Construction [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Percentage of loan portfolio 2.20%   2.20%          
Outstanding balance 10,900,000   10,900,000          
Nonaccrual commercial and industrial loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Outstanding balance 4,600,000   4,600,000          
Nonaccrual residential construction and land loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Outstanding balance 17,900,000   17,900,000          
Nonaccrual consumer loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Outstanding balance 392,000   392,000          
Nonaccrual commercial real estate loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Outstanding balance 23,100,000   23,100,000          
Covered loans held for sale activity [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Transfers of loans to held for sale 0    0          
Write-down of loans held for sale 0    1,219,000           
Covered, Held For Sale Loans 0    0    3,771,000 5,664,000      
Nonaccrual non-covered impaired loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Impaired, at carrying value 31,800,000   31,800,000          
Non-covered impaired loans [Member]
               
Loans and Lease Finance Receivables (Textual) [Abstract]                
Impaired, at carrying value           $ 101,200,000