Fair Values of Assets and Liabilities (Measured on Recurring Basis) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	$ 564,850,000	$ 431,306,000
Continuing operations [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	564,850,000	431,306,000
Continuing operations [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	564,850,000	431,306,000
Mortgage servicing rights	726,000
Total assets at fair value	565,576,000	431,306,000
Total liabilities at fair value	0
Continuing operations [Member] | Recurring [Member] | Total [Member] | U.S, Treasury and government agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	6,981,000	7,188,000
Continuing operations [Member] | Recurring [Member] | Total [Member] | U.S. government sponsored agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	22,173,000	32,364,000
Continuing operations [Member] | Recurring [Member] | Total [Member] | States and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	6,038,000	6,090,000
Continuing operations [Member] | Recurring [Member] | Total [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	441,074,000	350,273,000
Continuing operations [Member] | Recurring [Member] | Total [Member] | Residential mortgage-backed securities - private [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	22,945,000	32,217,000
Continuing operations [Member] | Recurring [Member] | Total [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	23,359,000
Continuing operations [Member] | Recurring [Member] | Total [Member] | Commercial mortgage-backed securities - private [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	5,317,000
Continuing operations [Member] | Recurring [Member] | Total [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	36,963,000	3,174,000
Continuing operations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Mortgage servicing rights	0
Total assets at fair value	0	0
Continuing operations [Member] | Recurring [Member] | Level 1 [Member] | U.S, Treasury and government agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 1 [Member] | U.S. government sponsored agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 1 [Member] | States and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 1 [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 1 [Member] | Residential mortgage-backed securities - private [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 1 [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0
Continuing operations [Member] | Recurring [Member] | Level 1 [Member] | Commercial mortgage-backed securities - private [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0
Continuing operations [Member] | Recurring [Member] | Level 1 [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	564,850,000	431,306,000
Mortgage servicing rights	0
Total assets at fair value	564,850,000	431,306,000
Continuing operations [Member] | Recurring [Member] | Level 2 [Member] | U.S, Treasury and government agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	6,981,000	7,188,000
Continuing operations [Member] | Recurring [Member] | Level 2 [Member] | U.S. government sponsored agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	22,173,000	32,364,000
Continuing operations [Member] | Recurring [Member] | Level 2 [Member] | States and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	6,038,000	6,090,000
Continuing operations [Member] | Recurring [Member] | Level 2 [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	441,074,000	350,273,000
Continuing operations [Member] | Recurring [Member] | Level 2 [Member] | Residential mortgage-backed securities - private [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	22,945,000	32,217,000
Continuing operations [Member] | Recurring [Member] | Level 2 [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	23,359,000
Continuing operations [Member] | Recurring [Member] | Level 2 [Member] | Commercial mortgage-backed securities - private [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	5,317,000
Continuing operations [Member] | Recurring [Member] | Level 2 [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	36,963,000	3,174,000
Continuing operations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Mortgage servicing rights	726,000
Total assets at fair value	726,000	0
Continuing operations [Member] | Recurring [Member] | Level 3 [Member] | U.S, Treasury and government agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 3 [Member] | U.S. government sponsored agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 3 [Member] | States and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 3 [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 3 [Member] | Residential mortgage-backed securities - private [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Continuing operations [Member] | Recurring [Member] | Level 3 [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0
Continuing operations [Member] | Recurring [Member] | Level 3 [Member] | Commercial mortgage-backed securities - private [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0
Continuing operations [Member] | Recurring [Member] | Level 3 [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Discontinued operations [Member] | Recurring [Member] | Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0
Total liabilities at fair value	$ 0