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Fair Values of Assets and Liabilities (Fair Value of Financial Instruments) (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Financial Assets of Continuing Operations:    
Investment securities: Available-for-sale $ 564,850,000 $ 431,306,000
Transfers between valuation levels    
Level 1 to Level 2 0 0
Level 2 to Level 1 0 0
Continuing operations [Member] | Carrying value [Member]
   
Financial Assets of Continuing Operations:    
Cash and cash equivalents 239,610,000 553,416,000
Investment securities: Available-for-sale 564,850,000 431,306,000
Loans held for sale 6,974,000 4,529,000
Loans, net 1,147,721,000 1,178,175,000
Accrued interest receivable 6,102,000 5,919,000
Financial Liabilities of Continuing Operations:    
Deposits 1,906,988,000 2,129,111,000
Retail repurchase agreements 8,675,000 8,838,000
Federal Home Loan Bank advances 58,328,000 58,370,000
Junior subordinated debentures 56,702,000 56,702,000
Accrued interest payable 2,111,000 1,654,000
Continuing operations [Member] | Estimated fair value [Member]
   
Financial Assets of Continuing Operations:    
Cash and cash equivalents 239,610,000 553,416,000
Investment securities: Available-for-sale 564,850,000 431,306,000
Loans held for sale 6,974,000 4,529,000
Loans, net 1,140,088,000 1,176,795,000
Accrued interest receivable 6,102,000 5,919,000
Financial Liabilities of Continuing Operations:    
Deposits 1,910,927,000 2,139,093,000
Retail repurchase agreements 8,675,000 8,838,000
Federal Home Loan Bank advances 62,950,000 62,555,000
Junior subordinated debentures 18,760,000 36,218,000
Accrued interest payable 2,111,000 1,654,000
Continuing operations [Member] | Level 1 [Member]
   
Financial Assets of Continuing Operations:    
Cash and cash equivalents 239,610,000 553,416,000
Investment securities: Available-for-sale 0 0
Loans held for sale 0 0
Loans, net 0 0
Accrued interest receivable 0 0
Financial Liabilities of Continuing Operations:    
Deposits 0 0
Retail repurchase agreements 0 0
Federal Home Loan Bank advances 0 0
Junior subordinated debentures 0 0
Accrued interest payable 0 0
Continuing operations [Member] | Level 2 [Member]
   
Financial Assets of Continuing Operations:    
Cash and cash equivalents 0 0
Investment securities: Available-for-sale 564,850,000 431,306,000
Loans held for sale 6,974,000 4,529,000
Loans, net 0 0
Accrued interest receivable 6,102,000 5,919,000
Financial Liabilities of Continuing Operations:    
Deposits 1,910,927,000 2,139,093,000
Retail repurchase agreements 8,675,000 8,838,000
Federal Home Loan Bank advances 62,950,000 62,555,000
Junior subordinated debentures 0 0
Accrued interest payable 2,111,000 1,654,000
Continuing operations [Member] | Level 3 [Member]
   
Financial Assets of Continuing Operations:    
Cash and cash equivalents 0 0
Investment securities: Available-for-sale 0 0
Loans held for sale 0 0
Loans, net 1,140,088,000 1,176,795,000
Accrued interest receivable 0 0
Financial Liabilities of Continuing Operations:    
Deposits 0 0
Retail repurchase agreements 0 0
Federal Home Loan Bank advances 0 0
Junior subordinated debentures 18,760,000 36,218,000
Accrued interest payable 0 0
Discontinued operations [Member] | Carrying value [Member]
   
Financial Assets of Continuing Operations:    
Financial assets 0 233,000
Discontinued operations [Member] | Estimated fair value [Member]
   
Financial Assets of Continuing Operations:    
Financial assets $ 0 $ 233,000