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Parent Company Condensed Financial Information (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash Flows from Operating Activities    
Net loss $ (72) $ (6,498)
Adjustments to reconcile net loss to net cash from operating activities:    
Change in taxes payable 815 5,750
Net premium amortization on securities 943 156
Stock-based compensation 291 951
Net cash provided by operating activities 43,303 29,303
Cash Flows from Investing Activities    
Proceeds from the sales and maturities of securities available-for-sale 223,860 26,281
Net cash (used in) provided by investing activities (59,094) 95,942
Cash Flows from Financing Activities    
Purchases of treasury stock (63) (49)
Net cash provided by (used in) financing activities 93,349 (173,054)
Net change in cash and cash equivalents 77,558 (47,809)
Cash and cash equivalents at beginning of period 50,949 98,758
Cash and cash equivalents at end of period 128,507 50,949
Old Second Bancorp, Inc
   
Cash Flows from Operating Activities    
Net loss (72) (6,498)
Adjustments to reconcile net loss to net cash from operating activities:    
Equity in undistributed net loss income of subsidiaries (6,555) 6,070
Change in taxes payable 2,445 (9,644)
Change in other assets (100) (43)
Net premium amortization on securities   4
Stock-based compensation 291 951
Other, net 3,293 6,917
Net cash provided by operating activities (698) (2,243)
Cash Flows from Investing Activities    
Proceeds from the sales and maturities of securities available-for-sale   1,750
Net cash (used in) provided by investing activities   1,750
Cash Flows from Financing Activities    
Purchases of treasury stock (63) (49)
Net cash provided by (used in) financing activities (63) (49)
Net change in cash and cash equivalents (761) (542)
Cash and cash equivalents at beginning of period 4,315 4,857
Cash and cash equivalents at end of period $ 3,554 $ 4,315