Investment Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Available-for-sale, Amortized cost, Due in one year or less	$ 0
Available-for-sale, Amortized cost, Due after one year through three years	56
Available-for-sale, Amortized cost, Due after three years through five years	10
Available-for-sale, Amortized cost, Due after five years through ten years	48,408
Available-for-sale, Amortized cost, Due after ten years	178,650
Available-for-sale, Amortized cost, Mutual fund	492
Available-for-sale, Amortized cost, Tax credit investments	0
Available-For-Sale Securities, Debt Maturities, Amortized Cost Basis	227,616
Available-for-sale, Estimated fair value, Due in one year or less	0
Available-for-sale, Estimated fair value, Due after one year through three years	55
Available-for-sale, Estimated fair value, Due after three years through five years	10
Available-for-sale, Estimated fair value, Due after five years through ten years	48,263
Available-for-sale Estimated fair value, Due after ten years	183,822
Available-for-sale, Estimated fair value, Mutual fund	522
Available-for-sale, Estimated fair value, Tax credit investments	0
Available-for-sale Securities, Debt Securities	232,672
Held-to-maturity Securities, Amortized cost, Due in one year or less	315
Held-to-maturity Securities, Amortized cost, Due after one year through three years	707
Held-to-maturity Securities, Amortized cost, Due after three years through five years	0
Held-to-maturity Securities, Amortized cost, Due after five years through ten years	0
Held-to-maturity Securities, Amortized cost, Due after ten years	0
Held-to-maturity Securities, Amortized cost, Mutual fund	0
Held-to-maturity Securities, Amortized cost, Tax credit investments	784
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	1,806
Held-to-maturity Estimated fair value, Due in one year or less	317
Held-to-maturity Estimated fair value, Due after one year through three years	746
Held-to-maturity Estimated fair value, Due after three years through five years	0
Held-to-maturity Estimated fair value, Due after five years through ten years	0
Held-to-maturity Estimated fair value, Due after ten years	0
Held-to-maturity Estimated fair value, Mutual fund	0
Held-to-maturity Estimated fair value, Tax credit investments	784
Held-to-maturity Securities, Debt Maturities, Fair Value	$ 1,847