Fair Value Measurements (Details 5) (Non-recurring, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Impaired loans
Fair value measurements
Impairment charges (recoveries)	$ 0	$ 460,000
Partnership investments
Fair value measurements
Impairment charges (recoveries)	(420,000)	(280,000)
Mortgage servicing rights
Fair value measurements
Impairment charges (recoveries)	0	(240,000)
Repossessions
Fair value measurements
Impairment charges (recoveries)	(20,000)	400,000
Other real estate
Fair value measurements
Impairment charges (recoveries)	340,000	710,000
Level 3
Fair value measurements
Loans	670,000	2,027,000
Assets measured at fair value	17,422,000	14,111,000
Level 3 | Partnership investments
Fair value measurements
Accrued income and other assets	2,156,000	2,032,000
Level 3 | Mortgage servicing rights
Fair value measurements
Accrued income and other assets	4,844,000	4,645,000
Level 3 | Repossessions
Fair value measurements
Accrued income and other assets	4,262,000	63,000
Level 3 | Other real estate
Fair value measurements
Accrued income and other assets	5,490,000	5,344,000
Total
Fair value measurements
Loans	670,000	2,027,000
Assets measured at fair value	17,422,000	14,111,000
Total | Partnership investments
Fair value measurements
Accrued income and other assets	2,156,000	2,032,000
Total | Mortgage servicing rights
Fair value measurements
Accrued income and other assets	4,844,000	4,645,000
Total | Repossessions
Fair value measurements
Accrued income and other assets	4,262,000	63,000
Total | Other real estate
Fair value measurements
Accrued income and other assets	$ 5,490,000	$ 5,344,000