Enhance bank statement detection with comprehensive keywords

backend/app/classifier.py

@@ -75,7 +75,7 @@ DOCUMENT_TYPES = {
     },
     "bank statement": {
         "description": "A financial document from a bank showing account transactions, balances, deposits, and withdrawals.",
-        "keywords": ["account", "balance", "transaction", "deposit", "withdrawal", "bank statement", "account number", "account balance", "statement period", "debit", "credit", "checking", "savings"]
+        "keywords": ["bank statement", "account statement", "statement of account", "account number", "account balance", "opening balance", "closing balance", "available balance", "statement period", "statement date", "transaction", "transactions", "deposit", "withdrawal", "debit", "credit", "checking account", "savings account", "account summary", "bank name", "routing number", "ending balance", "beginning balance", "total deposits", "total withdrawals", "service charge", "interest earned", "atm", "check", "checks", "transfer", "fee"]
     },
     "tax document": {
         "description": "Tax-related paperwork such as W-2 forms, 1099 forms, tax returns, or IRS correspondence.",