Fair Value Measurements (Details 2) (Level 3, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Rollforward for financial instruments measured at fair value using Level 3 inputs
Balance, beginning of Period	$ 62,621	$ 54,577	$ 58,357	$ 60,377
Issuances	4,079		8,384
Total gains or losses (realized or unrealized):
Included in net income (loss)	2,211		2,937
Included in other comprehensive income (loss)	4,092	7,491	3,325	1,691
Balance, end of Period	73,003	62,068	73,003	62,068
Available for sale securities
Rollforward for financial instruments measured at fair value using Level 3 inputs
Balance, beginning of Period	55,501	54,577	56,277	60,377
Total gains or losses (realized or unrealized):
Included in other comprehensive income (loss)	4,092	7,491	3,325	1,691
Balance, end of Period	59,602	62,068	59,602	62,068
Mortgage servicing asset
Rollforward for financial instruments measured at fair value using Level 3 inputs
Balance, beginning of Period	7,111		2,080
Issuances	4,079		8,384
Total gains or losses (realized or unrealized):
Included in net income (loss)	2,211		2,937
Balance, end of Period	$ 13,401		$ 13,401