Mortgage Banking (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Mortgage servicing assets:
Balance at beginning of period	$ 10,059	$ 10,477	$ 10,219	$ 10,602
Loans sold, servicing retained	969	446	2,527	1,117
Amortization	(892)	(553)	(2,610)	(1,349)
Carrying value before valuation allowance at end of period	10,136	10,370	10,136	10,370
Valuation allowance:
Balance at beginning of period	(1,784)	(638)	(1,529)	(1,125)
Impairment recovery (charges)	(600)	(1,072)	(855)	(585)
Balance at end of period	(2,384)	(1,710)	(2,384)	(1,710)
Net carrying value of MSRs at end of period	7,752	8,660	7,752	8,660
Fair value of MSRs at end of period	$ 7,752	$ 8,660	$ 7,752	$ 8,660