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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Carrying Amount
   
Financial Assets:    
Federal Home Loan Bank stock $ 24,308 $ 22,495
Quoted Prices in Active Markets for Identical Assets (Level 1) | Carrying Amount
   
Financial Assets:    
Cash and cash equivalents 280,813 312,916
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value
   
Financial Assets:    
Cash and cash equivalents 280,813 312,916
Significant Other Observable Inputs (Level 2) | Carrying Amount
   
Financial Assets:    
Loans held for sale 48,941 51,635
Customers' liabilities on acceptances 12,200 10,493
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Noninterest-bearing deposits 1,182,509 1,184,285
Saving and other interest bearing demand deposits 1,461,596 1,428,990
Time deposits 1,911,569 1,770,760
Borrowings from Federal Home Loan Bank 421,632 420,722
Subordinated debentures 45,996 41,846
Bank's liabilities on acceptances outstanding 12,200 10,493
Significant Other Observable Inputs (Level 2) | Estimated Fair Value
   
Financial Assets:    
Loans held for sale 55,380 57,856
Customers' liabilities on acceptances 12,200 10,493
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Noninterest-bearing deposits 1,182,509 1,184,285
Saving and other interest bearing demand deposits 1,461,596 1,428,990
Time deposits 1,914,546 1,772,778
Borrowings from Federal Home Loan Bank 426,278 425,107
Subordinated debentures 47,524 32,218
Bank's liabilities on acceptances outstanding 12,200 10,493
Significant Unobservable Inputs (Level 3) | Carrying Amount
   
Financial Assets:    
Loans receivable - net 4,426,778 4,229,311
FDIC loss share receivable 4,386 5,797
Significant Unobservable Inputs (Level 3) | Estimated Fair Value
   
Financial Assets:    
Loans receivable - net 4,872,847 4,591,685
FDIC loss share receivable $ 4,386 $ 5,797