| Component: (Network and Table) | |
|---|---|
| Network | 1079 - Disclosure - Fair Value Measurement - Roll-Forward of the Consolidated Condensed Statement of Financial Condition Items (Detail) (http://www.bankwithheritage.com/taxonomy/role/DisclosureFairValueMeasurementRollForwardOfTheConsolidatedCondensedStatementOfFinancialConditionItems) |
| Table | Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] |
| Reporting Entity [Axis] | 0001041550 (http://www.sec.gov/CIK) |
| Balance Sheet Location [Axis] | Other Assets [Member] |
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | Period [Axis] | |
|---|---|---|
2016-01-01 - 2016-12-31 | 2015-01-01 - 2015-12-31 | |
Fair value, Beginning balance | ||
Change in unrealized gains (losses) included in other comprehensive income for assets and liabilities still held at December 31, | ( | |
Other than temporary impairment charge | ||
Recovery of prior impairment charge | ||
Purchases, issuances and settlements, net | ||
Transfers in and/or out of Level 3 | ||
Fair value, Ending balance | 1,865,000 | |