Liquidity and Capital Resources - Information regarding Corporation's obligations and commitments to make future payments under contracts (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Contractual obligations: Payments due by period
Less than 1 year	$ 149,495
More than 1-3 years	96,652
More than 4-5 years	24,304
More than 5 years	2,701
Total	273,152
Advances from the Federal Home Loan Bank
Contractual obligations: Payments due by period
Less than 1 year	870
More than 1-3 years	12,175
More than 4-5 years	2,244
More than 5 years	2,512
Total	17,801
Certificates of deposit
Contractual obligations: Payments due by period
Less than 1 year	121,859
More than 1-3 years	84,366
More than 4-5 years	21,942
More than 5 years
Total	228,167
Lease obligations
Contractual obligations: Payments due by period
Less than 1 year	77
More than 1-3 years	111
More than 4-5 years	118
More than 5 years	189
Total	495
Commitments to originate one- to four-family loans
Contractual obligations: Payments due by period
Less than 1 year	1,096
More than 1-3 years
More than 4-5 years
More than 5 years
Total	1,096
Home equity lines of credit
Contractual obligations: Payments due by period
Less than 1 year	21,406
More than 1-3 years
More than 4-5 years
More than 5 years
Total	21,406
Commercial lines of credit
Contractual obligations: Payments due by period
Less than 1 year	999
More than 1-3 years
More than 4-5 years
More than 5 years
Total	999
Undisbursed loans in process
Contractual obligations: Payments due by period
Less than 1 year	3,188
More than 1-3 years
More than 4-5 years
More than 5 years
Total	$ 3,188