Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance	$ 1,969	$ 1,561	$ 1,718	$ 1,817
Total gains or losses (realized/unrealized):
Included in earnings	5	26	55	(31)
Included in other comprehensive income	92	97	196	(225)
Purchases, issuances, and settlements	0	1,500	0	0
Transfers in to/out of Level 3	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	2,066	3,184	1,969	1,561
Corporate bonds [Member]
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance	1,838	1,491	1,642	1,716
Total gains or losses (realized/unrealized):
Included in earnings	0	0	0	0
Included in other comprehensive income	92	97	196	(225)
Purchases, issuances, and settlements	0	1,500	0	0
Transfers in to/out of Level 3	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	1,930	3,088	1,838	1,491
Interest Rate Lock Commitments [Member]
Reconciliation for all assets and liabilities measured at fair value on a recurring basis
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance	131	70	76	101
Total gains or losses (realized/unrealized):
Included in earnings	5	26	55	(31)
Included in other comprehensive income	0	0	0	0
Purchases, issuances, and settlements	0	0	0	0
Transfers in to/out of Level 3	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	$ 136	$ 96	$ 131	$ 70