Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Valuation Allowance:
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ 1,690,000	$ (2,130,000)	$ 3,680,000	$ (2,130,000)
Servicing Asset at Fair Value, Amount	44,900,000		44,900,000
Residential Mortgage [Member]
Amortized Cost:
Balance at beginning of period	41,750,000	37,003,000	39,737,000	34,666,000
Originations of mortgage servicing rights	2,909,000	4,341,000	10,371,000	11,177,000
Amortization	(2,031,000)	(2,711,000)	(7,480,000)	(7,210,000)
Balance at end of period	42,628,000	38,633,000	42,628,000	38,633,000
Valuation Allowance:
Valuation Allowance	(1,690,000)	(1,550,000)	(3,680,000)	(1,550,000)
Valuation Allowance	0	(3,680,000)	0	(3,680,000)
Net MSRs at end of period	$ 42,628,000	$ 34,953,000	$ 42,628,000	$ 34,953,000