Fair Value Measurements (Details 1) (Significant other unobservable inputs (Level 3), USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Balance at the beginning of the period		$ 42,868
Amortization		(246)
Accretion		61
Payments received		(7,266)
Purchases		14,691
Total gains or losses (realized/unrealized) included in earnings		(96)
Total gains or losses (realized/unrealized) included in other comprehensive income		324
Balance at the end of the period		50,336
PreTSLs
Balance at the beginning of the period		3,801
Amortization		0
Accretion		0
Payments received		(69)
Purchases		0
Total gains or losses (realized/unrealized) included in earnings		(96)
Total gains or losses (realized/unrealized) included in other comprehensive income		221
Balance at the end of the period		3,857
State and Political Subdivisions
Balance at the beginning of the period	1,739	2,811
Amortization	0	0
Accretion	0	0
Payments received	(285)	(270)
Sales	(622)
Purchases		0
Total gains or losses (realized/unrealized) included in earnings	2	0
Total gains or losses (realized/unrealized) included in other comprehensive income	11	52
Balance at the end of the period	845	2,593
Private Label CMOs
Balance at the beginning of the period		36,256
Amortization		(246)
Accretion		61
Payments received		(6,927)
Purchases		14,691
Total gains or losses (realized/unrealized) included in earnings		0
Total gains or losses (realized/unrealized) included in other comprehensive income		51
Balance at the end of the period		$ 43,886