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Investments - Textual (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Schedule of Available-for-sale Securities
Available-for-sale Securities Pledged as Collateral	$ 92,484,000
Available-for-sale Securities, Gross Unrealized Gain (Loss)	10,007,000		12,891,000
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities	335,000	143,000
Available-for-sale Securities, Gross Unrealized Losses	1,969,000		1,721,000
Gross Unrealized Gains	11,976,000		14,612,000
U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale Securities, Number of Positions	5
Debt Securities, Amortized Cost	14,894,000		9,443,000
Available-for-sale Securities, Gross Unrealized Losses	16,000		23,000
Gross Unrealized Gains	70,000		34,000
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Available-for-sale Securities, Number of Positions	193
Debt Securities, Amortized Cost	149,843,000		151,312,000
Available-for-sale Securities, Gross Unrealized Losses	1,144,000		385,000
Gross Unrealized Gains	9,166,000		10,751,000
U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Available-for-sale Securities, Number of Positions	179
Debt Securities, Amortized Cost	179,915,000		206,465,000
Available-for-sale Securities, Gross Unrealized Losses	741,000		1,107,000
Gross Unrealized Gains	1,826,000		3,152,000
Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Available-for-sale Securities, Gross Unrealized Gain (Loss)	550,000
Available-for-sale Securities, Number of Positions	22
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions	4
Debt Securities, Amortized Cost	5,707,000		6,258,000
Available-for-sale Securities, Gross Unrealized Losses	68,000		206,000
Available-for-sale, Securities in Unrealized Gain Positions, Number of Positions	18
Gross Unrealized Gains	618,000		323,000
Other equity securities
Schedule of Available-for-sale Securities
Available-for-sale Securities, Gross Unrealized Losses	0		0
Gross Unrealized Gains	296,000		352,000
Less than 12 months | U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions	2
Less than 12 months | Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions	36
Less than 12 months | U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions	33
Greater than 12 months | U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions	0
Greater than 12 months | Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions	0
Greater than 12 months | U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions	20
Below investment grade | Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Available-for-sale Securities, Gross Unrealized Gain (Loss)	415,000
Available-for-sale Securities, Number of Positions	7
Debt Securities, Amortized Cost	$ 4,370,000

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The fair value of available-for-sale securities that serve as collateral for borrowings.

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