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Note 11 - Deposits (Details) - Interest Expense for Each Deposit Type (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 11 - Deposits (Details) - Interest Expense for Each Deposit Type [Line Items]      
Interest bearing demand $ 471us-gaap_InterestExpenseDemandDepositAccounts $ 485us-gaap_InterestExpenseDemandDepositAccounts $ 610us-gaap_InterestExpenseDemandDepositAccounts
Savings 228us-gaap_InterestExpenseSavingsDeposits 254us-gaap_InterestExpenseSavingsDeposits 394us-gaap_InterestExpenseSavingsDeposits
Interest Expense [Member]      
Note 11 - Deposits (Details) - Interest Expense for Each Deposit Type [Line Items]      
Interest bearing demand 221us-gaap_InterestExpenseDemandDepositAccounts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
224us-gaap_InterestExpenseDemandDepositAccounts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
240us-gaap_InterestExpenseDemandDepositAccounts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
Money market 250us-gaap_InterestExpenseMoneyMarketDeposits
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
261us-gaap_InterestExpenseMoneyMarketDeposits
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
370us-gaap_InterestExpenseMoneyMarketDeposits
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
Savings 228us-gaap_InterestExpenseSavingsDeposits
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
254us-gaap_InterestExpenseSavingsDeposits
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
394us-gaap_InterestExpenseSavingsDeposits
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
Time, $250,000 and over 711boch_InterestExpenseTime250000OrMore
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
891boch_InterestExpenseTime250000OrMore
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
1,420boch_InterestExpenseTime250000OrMore
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
Time less than $250,000 1,897boch_InterestExpenseTimeDepositsLessThan250000
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
1,734boch_InterestExpenseTimeDepositsLessThan250000
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
2,277boch_InterestExpenseTimeDepositsLessThan250000
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
Total interest bearing deposits $ 3,307us-gaap_InterestExpenseDeposits
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
$ 3,364us-gaap_InterestExpenseDeposits
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
$ 4,701us-gaap_InterestExpenseDeposits
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember