Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingent Liabilities (Details Textual)

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Commitments and Contingent Liabilities (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Maturity period of majority of standby letters of credit within two years    
Carrying amount of deferred revenue associated with guarantees $ 6,900 $ 4,400  
Maturity period of Commercial letters of credit no longer than 90 days    
Percentage of Outstanding standby letters of credit collateralized 81.00%    
Commitments and Contingent Liabilities (Textuals) [Abstract]      
Commitments to sell residential real estate loans $ 807,900 545,000  
Maturity period of forward contracts relating mortgage banking business less than one year    
Gross unrecognized tax benefit $ 0 1,200 $ 2,800
Total interest accrued on the unrecognized tax benefits 0 100 $ 100
Aggregate range of reasonably possible losses current legal proceedings, Min 0    
Aggregate range of reasonably possible losses current legal proceedings, Max 105,000    
Recovery from the bank as a form of unjust enrichment 1,900    
Direct damage claimed by Plantiffs $ 32,000    
Additional consequential damages by plantiffs excess of $20.0 million    
Bankruptcy trustee alleging for the amount $ 70,000    
Preferential transfer alleged by bankruptcy trustee 1,200    
Fraudulent transfers alleged by Teleservices bankruptcy trustee 73,000    
Credit related to recoveries in preference actions filed 4,000    
Bankruptcy trustee unable to recover 900    
Bankruptcy Court recommended judgment amount in Cyberco case, principal 71,800    
Bankruptcy Court recommended judgment amount in Cyberco case, interest 8,800    
Standby Letters of Credit [Member]      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Outstanding standby letters of credit 487,366 $ 497,457  
Risk Level, Low [Member]      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Outstanding standby letters of credit 161,000    
Risk Level, Medium [Member]      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Outstanding standby letters of credit 327,000    
Risk Level, High [Member]      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Outstanding standby letters of credit $ 0