PARENT COMPANY ONLY FINANCIAL INFORMATION (Condensed Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash deposited in First Bank (unrestricted cash)	$ 92,369	$ 114,841
Other assets	66,287	67,996
Total assets	5,918,983	6,509,126	6,608,913
Liabilities and Stockholders' Equity
Subordinated debentures	354,210	354,133	354,057
Accrued expenses and other liabilities	191,082	144,269
Total liabilities	5,430,727	6,209,167
First Banks, Inc. stockholders’ equity	394,422	206,304
Total liabilities and stockholders’ equity	5,918,983	6,509,126
Parent Company [Member]
Assets
Cash deposited in First Bank (unrestricted cash)	1,864	2,744
Investment in common securities - TRuPS	10,678	10,678
Investment in subsidiaries	838,489	657,838
Other assets	42,982	3,583
Total assets	894,013	674,843
Liabilities and Stockholders' Equity
Subordinated debentures	354,210	354,133
Accrued interest payable - TRuPS	62,855	47,878
Dividends payable	77,800	61,931
Accrued expenses and other liabilities	4,726	4,597
Total liabilities	499,591	468,539
First Banks, Inc. stockholders’ equity	394,422	206,304
Total liabilities and stockholders’ equity	$ 894,013	$ 674,843