XML 24 R11.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Cash, Due from Banks, Interest-Bearing Deposits and Federal Funds Sold | 12 Months Ended
--- | ---
Dec. 31, 2018
Cash And Cash Equivalents [Abstract] |
Cash, Due from Banks, Interest-Bearing Deposits and Federal Funds Sold | (3) CASH, DUE FROM BANKS, INTEREST-BEARING DEPOSITS AND FEDERAL FUNDS SOLD The Company maintains accounts with the Federal Reserve Bank and various other financial institutions primarily for the purpose of holding excess liquidity and clearing cash items. It may also sell federal funds to certain of these institutions on an overnight basis. At December 31, 2018 and 2017, the Company had no significant concentrations of credit risk with other financial institutions. The Company maintained vault cash and funds on deposit with the Federal Reserve Bank, which is included in the table below. The Company is required, as a matter of law, to maintain a reserve balance in the form of vault cash or cash on deposit with the Federal Reserve Bank. The average amount of required reserves for each of the years ended December 31, 2018 and 2017 is included in the following table:
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  | (Dollars in thousands) |
Vault cash and funds on deposit with the Federal Reserve Bank |  | $ | 1,299,872 |  |  | $ | 1,639,058 |
Average required Reserves |  |  | 45,195 |  |  |  | 44,485 |

X
- Definition Cash due from banks interest bearing deposits and federal funds sold. + References No definition available. + Details
Name: | banf_CashDueFromBanksInterestBearingDepositsAndFederalFundsSoldTextBlock
Namespace Prefix: | banf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration