Fair Value - Level 3 Instruments (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Rollforward of Level 3 Liabilities [Rollforward]
Theshold for individual impairment evaluation	$ 250,000
Other real estate owned	8,738,000	24,966,000
Interest Rate Lock Commitments | Derivative Financial Instruments, Assets
Rollforward of Level 3 Assets [Rollforward]
Ending balance	873,000	130,000
Forward loan sale commitments | Derivative Financial Instruments, Assets
Rollforward of Level 3 Assets [Rollforward]
Ending balance	(481,000)	57,000
Level 3 | Interest Rate Swap Agreements | Derivative Financial Instruments, Assets
Rollforward of Level 3 Assets [Rollforward]
Beginning balance	216,000	159,000
Purchases, sales, issuances and settlements	0	0
Gains/losses included in other income	(20,000)	57,000
Ending balance	196,000	216,000
Level 3 | Interest Rate Swap Agreements | Derivative Financial Instruments, Liabilities
Rollforward of Level 3 Liabilities [Rollforward]
Beginning balance	216,000	159,000
Purchases, sales, issuances and settlements	0	0
Gains/lossses included in other income	(20,000)	57,000
Ending balance	196,000	216,000
Level 3 | Interest Rate Lock Commitments | Derivative Financial Instruments, Assets
Rollforward of Level 3 Assets [Rollforward]
Beginning balance	130,000	105,000
Gains/losses included in other income	743,000	25,000
Transfer in and out	0	0
Ending balance	873,000	130,000
Level 3 | Mortgage Servicing Rights | Derivative Financial Instruments, Assets
Rollforward of Level 3 Assets [Rollforward]
Beginning balance	1,871,000	2,144,000
Capitalized	1,101,000	286,000
Gains/losses included in other income	(447,000)	(559,000)
Ending balance	$ 2,525,000	$ 1,871,000