| Component: (Network and Table) | |
|---|---|
| Network | 2308301 - Disclosure - Premises and equipment (Tables) (http://www.botc.com/role/PremisesAndEquipmentTables) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0000865911 (http://www.sec.gov/CIK) |
| Property, Plant and Equipment [Abstract] | Period [Axis] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2016-01-01 - 2016-12-31 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Property, Plant and Equipment [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Schedule of premises and equipment | Premises and equipment at December 31, 2016 and 2015 consisted of the following (dollars in thousands):
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||