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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2012
Fair Value, by Balance Sheet Grouping [Table Text Block] The following table presents the carrying value and fair value of the financial instruments.
                                     
    As of December 31, 2012     As of December 31, 2011     As of September 30, 2011  
(in thousands)   Carrying Value     Fair Value     Carrying Value     Fair Value     Carrying Value     Fair Value  
Assets                                                
 Cash and cash equivalents   $ 117,451     $ 117,451     $ 76,675     $ 76,675     $ 85,937     $ 85,937  
 Securities available for sale     253,798       253,798       404,550       404,550       412,108       412,108  
 Securities held to maturity     15,555       17,867       20,486       23,242       21,671       24,162  
 Nonmarketable securites     20,914       20,914       32,694       32,694       35,782       35,782  
 Net loans     2,451,145       2,502,376       2,331,933       2,427,526       2,301,001       2,379,886  
 Loans held for sale     55,201       55,201       48,303       48,303       94,872       94,872  
 FDIC indemnification asset, net     80,268       80,268       51,021       51,021       50,465       50,465  
 Other repossessed assets acquired1     18,338       18,338       20,487       20,487       26,212       26,212  
 Residential mortgage servicing rights1     13,910       13,910       10,663       10,663       10,572       10,572  
 Accrued interest receivable1     8,564       8,564       8,759       8,759       8,928       8,928  
 Derivative financial instruments1     2,561       2,561       2,238       2,238       1,816       1,816  
Liabilities                                                
 Deposits     2,595,333       2,608,927       2,239,198       2,253,138       2,302,857       2,318,531  
 Advances from FHLB     233,000       260,409       561,000       598,616       558,000       597,021  
 Long-term debt     47,204       46,749       47,204       43,487       47,204       43,356  
 FDIC true-up liability2     3,658       3,658       —       —       —       —  
 Accrued interest payable2     6,114       6,114       8,095       8,095       8,369       8,369  
                                                 
Fair Value, Assets Measured on Recurring Basis [Table Text Block] The following tables present the financial instruments measured at fair value on a recurring basis.
                         
    As of December 31, 2012  
(in thousands)   Level 1     Level 2     Level 3     Total  
Obligations of US government agencies and corporations   $ —     $ 1,278     $ —     $ 1,278  
State and municipal obligations     —       13,483       —       13,483  
Collateralized debt obligations     —       —       3,332       3,332  
Mortgage-backed securities     —       74,304       —       74,304  
Collateralized mortgage obligations     —       154,883       —       154,883  
Other securities     1,929       2,999       1,590       6,518  
Securities available for sale     1,929       246,947       4,922       253,798  
Residential mortgage servicing rights     —       —       13,910       13,910  
Derivative financial instruments     2,561       —       —       2,561  
Total assets at fair value   $ 4,490     $ 246,947     $ 18,832     $ 270,269  
                                 
    As of December 31, 2011  
(in thousands)   Level 1     Level 2     Level 3     Total  
Obligations of US government agencies and corporations   $ —     $ 1,823     $ —     $ 1,823  
State and municipal obligations     —       488       —       488  
Collateralized debt obligations     —       —       3,247       3,247  
Mortgage-backed securities     —       84,399       —       84,399  
Collateralized mortgage obligations     —       256,615       52,680       309,295  
Other securities     1,000       3,197       1,101       5,298  
Securities available for sale     1,000       346,522       57,028       404,550  
Residential mortgage servicing rights     —       —       10,663       10,663  
Derivative financial instruments     2,238       —       —       2,238  
Total assets at fair value   $ 3,238     $ 346,522     $ 67,691     $ 417,451  
                                 
    As of September 30, 2011  
(in thousands)   Level 1     Level 2     Level 3     Total  
Obligations of US government agencies and corporations   $ —     $ 1,863     $ —     $ 1,863  
State and municipal obligations     —       481       —       481  
Collateralized debt obligations     —       —       3,074       3,074  
Mortgage-backed securities     —       80,919       8,038       88,957  
Collateralized mortgage obligations     —       63,079       249,434       312,513  
Other securities     1,000       1,499       2,721       5,220  
 Securities available for sale     1,000       147,841       263,267       412,108  
Residential mortgage servicing rights     —       —       10,572       10,572  
Derivative financial instruments     1,816       —       —       1,816  
Total assets at fair value   $ 2,816     $ 147,841     $ 273,839     $ 424,496  
                                 
Fair Value Inputs, Assets, Quantitative Information [Table Text Block] The following table presents quantitative information regarding the assumptions used for valuing Level 3 assets.
    Fair Value as of                
(dollars in thousands)   December 31, 20121     Valuation Technique1   Unobservable Input   Range (Weighted Average)  
                    Minimum   Maximum   Average  
Collateralized debt obligations
  		 
  		$
  		3,332
  		 
  		 
  		Discounted
cash flow 		 
  		Discount margin to LIBOR  
  		10.50%
   16.80%
   (12.38%)
  
Collateralized debt obligations   $ 3,332     Discounted
cash flow 		  Constant default rate   0.25%   0.88%   (0.41%)  
                Default percentage   14.67%   51.61%   (33.67%)  
MSRs
  		 
  		$
  		13,910
  		 
  		 
  		Discounted
cash flow 		 
  		Constant prepayment rate  
 
      16.80%  
MSRs
  		 
  		$
  		13,910
  		 
  		 
  		Discounted
cash flow 		 
  		Discount rate  
  		        10.44%  
                Delinquency percentage           1.77%  
                       
Changes in Level 3 fair value measurements based on hierarchy levels [Table Text Block] The table below includes changes in Level 3 fair value measurements based on the hierarchy levels previously discussed. The gains (losses) in the following table may include changes to fair value due in part to observable factors that may be part of the valuation methodology.
    Year Ended
 December 31, 2012 		    Quarter Ended
 December 31, 2011 		    Year Ended
 September 30, 2011 		    Year Ended
 September 30, 2010 		 
              Residential               Residential               Residential               Residential  
 
 
(in thousands) 		 
 
  		 
 
  		Securities
Available For
 Sale 		 
 
  		 
 
  		 
 
  		Mortgage
Servicing
 Rights 		 
 
  		 
 
  		 
 
  		Securities
Available For
 Sale 		 
 
  		 
 
  		 
 
  		Mortgage
Servicing
 Rights 		 
 
  		 
 
  		 
 
  		Securities
Available For
 Sale 		 
 
  		 
 
  		 
 
  		Mortgage
Servicing
 Rights 		 
 
  		 
 
  		 
 
  		Securities
Available For
 Sale 		 
 
  		 
 
  		 
 
  		Mortgage
Servicing
 Rights 		 
 
 
Balance, beginning of period   $ 57,028     $ 10,663     $ 263,267     $ 10,572     $ 326,668     $ 10,200     $ 368,821     $ 11,166  
Total net (losses) gains for the year included in                                                                
                                                                 
Other-than-temporary impairment losses on investment securities     (359 )     —       (180 )     —       (879 )     —       (2,853 )     —  
Gain on sale or call of investments securities     —       —       —       —       1,419       —       —       —  
Mortgage and other loan income     —       (4,725 )     —       (1,251 )     —       (3,610 )     —       (4,266 )
Other comprehensive income (loss), gross     677       —       (8,012 )     —       (4,027 )     —       4,744       —  
                                                                 
Transfer to level 2     (39,778 )     —       (180,439 )     —       —       —       —       —  
Purchases     490       —       —       —       15,973       —       72,991       —  
Sales 1     —       —       —       —       —       —       —       —  
Servicing assets that resulted from transfers of financial assets     —       7,972       —       1,342       —       3,982       —       3,300  
Paydowns     (13,136 )     —       (17,608 )     —       (75,887 )     —       (117,035 )     —  
Balance, end of period   $ 4,922     $ 13,910     $ 57,028     $ 10,663     $ 263,267     $ 10,572     $ 326,668     $ 10,200  
                                                                 
Fair Value Measurements, Nonrecurring [Table Text Block] The table below presents the assets measured at fair value on a nonrecurring basis categorized by the level of inputs used in the valuation of each asset and the corresponding realized loss.
                           
(in thousands)     As of
December 31,
2012 		          Level 1           Level 2           Level 3         Year
to Date
Losses 		   
Loans held for sale   $ 55,201     $ —     $ 55,201     $ —     $ —  
Impaired loans, net of specific allowance     24,632       —       —       24,632       3,511  
Other repossessed assets acquired     18,338       —       —       18,338       1,138  
Total nonrecurring basis measured assets   $ 98,171     $ —     $ 55,201     $ 42,970     $ 4,649  
(in thousands)         As of
December 31,
2011 		              Level 1               Level 2               Level 3             Year
to Date
Losses 		   
Loans held for sale   $ 48,303     $ —     $ 48,303     $ —     $ —  
Impaired loans, net of specific allowance     24,668       —       —       24,668       (669 )
Other repossessed assets acquired     20,487       —       —       20,487       (845 )
Total nonrecurring basis measured assets   $ 93,458     $ —     $ 48,303     $ 45,155     $ (1,514 )
(in thousands)         As of
September 30,
2011 		              Level 1               Level 2               Level 3             Year
to Date
Losses 		   
Loans held for sale   $ 94,872     $ —     $ 40,785     $ 54,087     $ —  
Impaired loans, net of specific allowance     24,139       —       —       24,139       (2,875 )
Other repossessed assets acquired     26,212       —       —       26,212       (3,058 )
Total nonrecurring basis measured assets   $ 145,223     $ —     $ 40,785     $ 104,438     $ (5,933 )
                                         
Schedule Of Assets Not Recorded At Fair Value [Table Text Block] The following table presents the financial instruments not recorded at fair value categorized by the level of inputs.
       
    As of December 31, 2012  
(in thousands)   Level 1     Level 2     Level 3     Total  
Assets                        
Cash and cash equivalents   $ 117,451     $ —     $ —     $ 117,451  
Securities held to maturity     —       17,867       —       17,867  
Nonmarketable securities     —       —       20,914       20,914  
Net loans1     —       —       2,477,744       2,477,744  
FDIC indemnification asset, net     —       —       80,268       80,268  
Accrued interest receivable     8,564       —       —       8,564  
Liabilities                                
Deposits     —       —       2,608,927       2,608,927  
Advances from FHLB     —       —       260,409       260,409  
Long-term debt     —       —       46,749       46,749  
FDIC true-up liability     3,658       —       —       3,658  
Accrued interest payable     6,114       —       —       6,114  
      As of December 31, 2011  
(in thousands)     Level 1       Level 2       Level 3       Total  
Assets                                
Cash and cash equivalents   $ 76,675     $ —     $ —     $ 76,675  
Securities held to maturity     —       23,242       —       23,242  
Nonmarketable securities     —       —       32,694       32,694  
Net loans1     —       —       2,402,858       2,402,858  
FDIC indemnification asset, net     —       —       51,021       51,021  
Accrued interest receivable     8,759       —       —       8,759  
Liabilities                                
Deposits     —       —       2,253,138       2,253,138  
Advances from FHLB     —       —       598,616       598,616  
Long-term debt     —       —       43,487       43,487  
Accrued interest payable     8,095       —       —       8,095  
      As of September 30, 2011  
(in thousands)     Level 1       Level 2       Level 3       Total  
Assets                                
Cash and cash equivalents   $ 85,937     $ —     $ —     $ 85,937  
Securities held to maturity     —       24,162       —       24,162  
Nonmarketable securities     —       —       35,782       35,782  
Net loans1     —       —       2,355,747       2,355,747  
FDIC indemnification asset, net     —       —       50,465       50,465  
Accrued interest receivable     8,928       —       —       8,928  
Liabilities                                
Deposits     —       —       2,318,531       2,318,531  
Advances from FHLB     —       —       597,021       597,021  
Long-term debt     —       —       43,356       43,356  
Accrued interest payable     8,369       —       —       8,369