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Fair Value of Assets and Liabilities Fair Values of Assets and Liabilities (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2012
Valued Using Discounted Cash Flow Model [Member]
Jun. 30, 2012
Level 3 [Member]
Dec. 31, 2012
Fair Value [Member]
Dec. 31, 2011
Fair Value [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Dec. 31, 2012
Municipal Bonds [Member]
Dec. 31, 2012
Equity Securities [Member]
Dec. 31, 2012
Equity Securities [Member]
Level 3 [Member]
Dec. 31, 2012
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Mortgage Servicing Rights [Member]
Dec. 31, 2012
Mortgage Servicing Rights [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Equity Securities [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Mortgage Servicing Rights [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Mortgage Servicing Rights [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Other Real Estate Owned [Member]
Dec. 31, 2012
Maximum [Member]
Equity Securities [Member]
Level 3 [Member]
Dec. 31, 2012
Maximum [Member]
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Maximum [Member]
Mortgage Servicing Rights [Member]
Level 3 [Member]
Dec. 31, 2012
Maximum [Member]
Mortgage Servicing Rights [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Maximum [Member]
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                          
Fair value                           $ 30,770,000 $ 22,169,000     $ 6,750,000                      
Discount rate input                               2.09%     10.21% 1.85% 1.85% 10.00% 10.00% 0.00% 2.43% 2.43% 13.50% 13.50% 49.00%
Fair value inputs, prepayment rate                                     20.72%     19.00%         24.00%    
Remaining contractual principal balance outstanding, mortgage loans held-for-sale           379,500,000 300,000,000                                            
Mortgage loans held-for-sale 385,000,000   306,800,000         385,033,000 306,838,000 0 0                                    
Mortgages held-for-sale, past due 90 days and accruing 0   0                                                    
Total impaired loans 204,545,000 [1]   226,538,000 [1] 106,100,000                                                  
Impaired loans                       98,426,000 98,426,000                                
Other real estate owned 62,900,000   86,500,000                 62,891,000 62,891,000                                
Weighted average of inputs                                 2.09%                        
Secured Debt $ 0 $ 360,800,000 $ 600,000,000   $ 0                                                
[1] Impaired loans are considered by the Company to be non-accrual loans, restructured loans or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.